@charset "UTF-8";

/* ==========================================================================
   MUSTOK 视觉系统变量 (Design Tokens & Color Palette)
   ========================================================================== */
:root {
  --bg: #0c0d14;
  --bg-secondary: #13141e;
  --panel: #1b1a26;
  --panel-hover: #242232;
  --surface: #22202e;
  --surface-border: rgba(220, 190, 155, 0.2);
  --surface-border-hover: rgba(235, 198, 143, 0.45);

  --gold: #ecc58d;
  --gold-light: #fbebd4;
  --gold-dark: #b88647;
  --gold-gradient: linear-gradient(135deg, #faecd7 0%, #ecc58d 48%, #c58d4a 100%);
  --gold-gradient-soft: linear-gradient(145deg, rgba(236, 197, 141, 0.16) 0%, rgba(184, 134, 71, 0.08) 100%);
  --gold-glow: 0 0 25px rgba(236, 197, 141, 0.25);

  --text: #f5f3f0;
  --text-secondary: #c8c2bc;
  --text-muted: #8e8780;
  --line: rgba(222, 201, 182, 0.18);
  --line-strong: rgba(222, 201, 182, 0.35);

  --max: 1240px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  color-scheme: dark;
}

/* ==========================================================================
   基础与重置 (Reset & Base)
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background-color: var(--bg);
  background-image: 
    radial-gradient(circle 800px at 85% 15%, rgba(67, 50, 40, 0.35), transparent 70%),
    radial-gradient(circle 700px at 15% 65%, rgba(45, 36, 56, 0.38), transparent 70%),
    radial-gradient(circle 500px at 50% 90%, rgba(35, 27, 42, 0.25), transparent 70%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button, a {
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
  border: 0;
  background: none;
  padding: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button:focus-visible, a:focus-visible, summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

svg {
  display: block;
}

img {
  max-width: 100%;
  height: auto;
}

strong {
  font-weight: 650;
  color: #fff;
}

[hidden] {
  display: none !important;
}

.icon-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

.container {
  width: min(var(--max), calc(100% - 64px));
  margin-inline: auto;
}

section[id] {
  scroll-margin-top: 96px;
}

/* ==========================================================================
   全新精美图标系统样式 (Iconography System)
   ========================================================================== */
svg {
  flex-shrink: 0;
}

/* 通用图标规格与统一平滑线条 */
button svg, a svg, .round-icon svg, .cooperation-tags svg, summary svg, .project-icon svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.badge-icon, .tag-icon {
  width: 14px;
  height: 14px;
  fill: currentColor;
  stroke: none;
  color: var(--gold);
  vertical-align: -1px;
}

/* 品牌 Logo 区域 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", Arial, sans-serif;
  letter-spacing: 1.5px;
  font-weight: 800;
  font-size: 24px;
  color: #fff;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.brand:hover {
  transform: translateY(-1px);
}

.brand-mark {
  width: 34px;
  height: 34px;
  color: var(--gold);
  filter: drop-shadow(0 0 10px rgba(236, 197, 141, 0.45));
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.brand:hover .brand-mark {
  transform: rotate(15deg) scale(1.05);
}

.brand-text {
  background: linear-gradient(135deg, #fff 40%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ==========================================================================
   按钮体系 (Buttons)
   ========================================================================== */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.3px;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.button:hover {
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(0);
}

.button svg {
  width: 17px;
  height: 17px;
}

.button-gold {
  color: #1f160e;
  background: var(--gold-gradient);
  box-shadow: 0 4px 18px rgba(236, 197, 141, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.button-gold:hover {
  box-shadow: 0 8px 30px rgba(236, 197, 141, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.button-gold::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
}

.button-gold:hover::after {
  left: 150%;
}

.button-outline {
  border: 1px solid var(--surface-border-hover);
  color: var(--gold-light);
  background: rgba(26, 25, 36, 0.5);
  backdrop-filter: blur(8px);
}

.button-outline:hover {
  border-color: var(--gold);
  background: rgba(236, 197, 141, 0.12);
  color: #fff;
  box-shadow: 0 4px 20px rgba(236, 197, 141, 0.15);
}

.text-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 550;
  color: var(--gold);
  padding: 6px 0;
  transition: color 0.2s ease, transform 0.2s ease;
}

.text-button:hover {
  color: #fff;
  transform: translateX(3px);
}

/* ==========================================================================
   页头与导航 (Header & Navigation)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(12, 13, 20, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(220, 190, 155, 0.14);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.nav-wrap {
  width: min(1320px, calc(100% - 64px));
  height: 76px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 100%;
}

.desktop-nav a {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.desktop-nav a:hover,
.desktop-nav a.active {
  color: #fff;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-gradient);
  border-radius: 2px 2px 0 0;
  opacity: 0;
  transform: scaleX(0.5);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.desktop-nav a.active::after,
.desktop-nav a:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-download {
  min-height: 40px;
  padding: 8px 18px;
  font-size: 13px;
}

.nav-cta {
  min-height: 40px;
  padding: 8px 18px;
  font-size: 13px;
}

.menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--surface-border);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  padding: 16px 24px 28px;
  background: rgba(14, 15, 24, 0.98);
  border-bottom: 1px solid var(--surface-border);
  backdrop-filter: blur(24px);
  display: grid;
  gap: 6px;
  animation: slideDown 0.25s ease-out;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.mobile-nav a {
  padding: 12px 14px;
  font-size: 15px;
  font-weight: 550;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.mobile-nav a:hover, .mobile-nav a:focus {
  background: rgba(236, 197, 141, 0.08);
  color: var(--gold);
}

.mobile-nav-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   Hero 首屏 (Hero Section)
   ========================================================================== */
.hero {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  background: #090a10;
  display: flex;
  align-items: center;
}

.hero-art {
  position: absolute;
  right: 0;
  top: 0;
  width: 60%;
  height: 100%;
  opacity: 0.92;
  filter: contrast(1.05) saturate(1.1);
  mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,0.85) 30%, #000 100%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,0.85) 30%, #000 100%);
  pointer-events: none;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(90deg, #090a10 0%, rgba(9, 10, 16, 0.95) 35%, rgba(9, 10, 16, 0.6) 65%, transparent 100%),
    linear-gradient(0deg, #0c0d14 0%, transparent 25%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 64px;
  padding-bottom: 78px;
  max-width: 820px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.hero h1 {
  font-size: clamp(42px, 5vw, 68px);
  font-weight: 850;
  line-height: 1.16;
  letter-spacing: -1.5px;
  margin: 16px 0 20px;
}

.hero-cross {
  font-weight: 300;
  color: var(--gold);
  margin: 0 14px;
  font-style: normal;
  display: inline-block;
  transform: rotate(45deg);
}

.gold-text {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.hero-content > p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: nowrap;
}

.story-trigger {
  padding: 6px 20px 6px 8px;
  gap: 12px;
}

.play-circle {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--gold-gradient);
  color: #1c150c;
  box-shadow: 0 0 12px rgba(236, 197, 141, 0.4);
  transition: transform 0.25s ease;
}

.story-trigger:hover .play-circle {
  transform: scale(1.1);
}

.play-circle svg {
  width: 14px;
  height: 14px;
  margin-left: 2px;
}

/* 动感音频均衡器 (Dynamic Audio Equalizer) */
.equalizer {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  position: absolute;
  left: 56%;
  bottom: 46px;
  height: 80px;
  opacity: 0.75;
  pointer-events: none;
  filter: drop-shadow(0 0 8px rgba(236, 197, 141, 0.35));
}

.equalizer i {
  display: block;
  width: 3.5px;
  background: linear-gradient(180deg, #fff3dc 0%, var(--gold) 60%, var(--gold-dark) 100%);
  border-radius: 4px;
  transform-origin: bottom;
  animation: equalize 1.8s ease-in-out infinite alternate;
}

@keyframes equalize {
  0% { transform: scaleY(0.15); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0.3); opacity: 0.6; }
}

.scroll-cue {
  position: absolute;
  right: 40px;
  bottom: 28px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.scroll-cue:hover {
  color: var(--gold);
}

.scroll-cue span {
  display: block;
  width: 36px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}

/* ==========================================================================
   创作者专属特权专区 (Privileges Section - 回收与双榜重磅高光区)
   ========================================================================== */
.privileges-section {
  position: relative;
  z-index: 5;
  padding-top: 52px;
  padding-bottom: 24px;
}

.privileges-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 36px;
}

.section-tag-gold {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(236, 197, 141, 0.4);
  background: linear-gradient(135deg, rgba(236, 197, 141, 0.15) 0%, rgba(236, 197, 141, 0.04) 100%);
  color: var(--gold-light);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 1px;
  box-shadow: 0 0 16px rgba(236, 197, 141, 0.15);
  margin-bottom: 14px;
}

.privileges-header h2 {
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 850;
  line-height: 1.3;
  margin: 0 0 12px;
  background: linear-gradient(135deg, #fff 40%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.privileges-header p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0;
}

.privileges-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* 特权卡片通用 */
.privilege-card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 34px 32px 28px;
  overflow: hidden;
  border: 1px solid rgba(220, 190, 155, 0.25);
  background: linear-gradient(145deg, rgba(34, 30, 44, 0.8) 0%, rgba(18, 17, 26, 0.95) 100%);
  box-shadow: 
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 18px 48px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.privilege-card:hover {
  transform: translateY(-5px);
  border-color: rgba(236, 197, 141, 0.5);
  box-shadow: 
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 24px 60px rgba(0, 0, 0, 0.45),
    0 0 35px rgba(236, 197, 141, 0.18);
}

.privilege-glow {
  position: absolute;
  top: -80px;
  right: -80px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(236, 197, 141, 0.25) 0%, transparent 70%);
  pointer-events: none;
  filter: blur(30px);
  transition: opacity 0.3s ease;
}

.privilege-card:hover .privilege-glow {
  opacity: 1;
}

.privilege-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

.privilege-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 650;
  border: 1px solid rgba(236, 197, 141, 0.3);
  background: rgba(236, 197, 141, 0.1);
  color: var(--gold-light);
}

.privilege-badge svg {
  width: 14px;
  height: 14px;
  color: var(--gold);
}

.privilege-badge.gold-badge {
  border-color: rgba(236, 197, 141, 0.5);
  background: linear-gradient(135deg, rgba(236, 197, 141, 0.2) 0%, rgba(184, 134, 71, 0.1) 100%);
}

.privilege-time {
  font-size: 11px;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

/* 核心数字指标框 */
.privilege-metric-box {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  background: rgba(14, 14, 22, 0.6);
  border: 1px solid rgba(220, 190, 155, 0.16);
  margin-bottom: 20px;
}

.metric-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, rgba(236, 197, 141, 0.22) 0%, rgba(35, 24, 20, 0.7) 100%);
  border: 1px solid rgba(236, 197, 141, 0.4);
  color: var(--gold-light);
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.metric-icon-wrap svg {
  width: 28px;
  height: 28px;
}

.metric-icon-wrap.trophy-icon {
  background: var(--gold-gradient);
  color: #1f150c;
  border-color: #fff;
  box-shadow: 0 0 24px rgba(236, 197, 141, 0.4);
}

.metric-content {
  flex: 1;
}

.metric-number {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  row-gap: 2px;
}

.metric-kicker {
  flex: 0 0 100%;
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 1px;
  opacity: 0.85;
  line-height: 1.3;
  margin-bottom: 2px;
}

.metric-number .metric-badge {
  align-self: center;
}


.metric-number strong {
  font-size: 32px;
  font-weight: 850;
  line-height: 1.15;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.5px;
}

.metric-number strong small {
  font-size: 22px;
  font-weight: 400;
  margin: 0 2px;
  color: var(--gold);
}

.metric-number.prize-gradient strong {
  font-size: 27px;
  letter-spacing: -0.5px;
}

.metric-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  background: rgba(236, 197, 141, 0.15);
  color: var(--gold-light);
  border: 1px solid rgba(236, 197, 141, 0.3);
}

.metric-title {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.privilege-desc {
  margin-bottom: 20px;
}

.privilege-desc p {
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin: 0;
}

.privilege-desc strong {
  color: var(--gold-light);
  font-weight: 650;
}

/* 亮点胶囊 */
.privilege-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 22px;
}

.highlight-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 600;
  padding: 7px 6px;
  border-radius: var(--radius-sm);
  background: rgba(236, 197, 141, 0.07);
  border: 1px solid rgba(236, 197, 141, 0.2);
  color: var(--gold-light);
  text-align: center;
  white-space: nowrap;
}

.highlight-chip svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  color: var(--gold);
}

/* 奖品阶梯展示 */
.prize-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.prize-header-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.prize-header-tag .badge-icon {
  width: 13px;
  height: 13px;
  opacity: 0.7;
}

.prize-hierarchy {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 22px;
}

.prize-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  background: rgba(16, 16, 24, 0.55);
  border: 1px solid rgba(220, 190, 155, 0.12);
  border-left: 3px solid rgba(220, 190, 155, 0.2);
  text-align: left;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.prize-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.prize-item.rank-1 {
  background: linear-gradient(135deg, rgba(236, 197, 141, 0.13) 0%, rgba(20, 18, 26, 0.85) 100%);
  border-color: rgba(236, 197, 141, 0.3);
  border-left-color: var(--gold);
  box-shadow: 0 4px 16px rgba(236, 197, 141, 0.1), inset 0 1px 0 rgba(255,255,255,0.08);
}

.prize-item.rank-2 {
  border-left-color: rgba(192, 192, 210, 0.6);
}

.prize-item.rank-3 {
  border-left-color: rgba(195, 140, 90, 0.5);
}

.prize-rank-col {
  flex-shrink: 0;
  min-width: 60px;
}

.rank-tag {
  display: block;
  font-size: 11.5px;
  font-weight: 800;
  font-family: Georgia, serif;
  color: var(--gold);
  line-height: 1.2;
  letter-spacing: 0.3px;
}

.prize-item.rank-2 .rank-tag {
  color: rgba(210, 210, 230, 0.85);
}

.prize-item.rank-3 .rank-tag {
  color: rgba(205, 155, 100, 0.9);
}

.rank-desc {
  display: block;
  font-size: 9.5px;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.3;
}

.prize-detail-col {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.prize-label-badge {
  flex-shrink: 0;
  display: inline-block;
  font-size: 9.5px;
  font-weight: 700;
  color: #1f150c;
  background: var(--gold-gradient);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  line-height: 1.6;
  opacity: 0.85;
}

.prize-item.rank-1 .prize-label-badge {
  opacity: 1;
}

.prize-name {
  flex: 1;
  font-size: 13.5px;
  font-weight: 650;
  color: #fff;
  line-height: 1.35;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.prize-item.rank-1 .prize-name {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

/* 细则展开 */
.privilege-details {
  margin-top: auto;
  border-top: 1px solid rgba(220, 190, 155, 0.14);
  padding-top: 14px;
}

.privilege-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  list-style: none;
  font-size: 12.5px;
  font-weight: 550;
  color: var(--gold);
  transition: color 0.2s ease;
}

.privilege-details summary::-webkit-details-marker {
  display: none;
}

.privilege-details summary:hover {
  color: #fff;
}

.details-arrow {
  font-size: 16px;
  font-weight: 300;
  transition: transform 0.25s ease;
}

.privilege-details[open] .details-arrow {
  transform: rotate(45deg);
}

.details-body {
  padding-top: 10px;
}

.details-body p {
  font-size: 11.5px;
  line-height: 1.75;
  color: var(--text-muted);
  margin: 0;
}

/* 创作底部与顶部联动的优雅呼应条 */
.creation-privilege-callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 28px;
  padding: 20px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(236, 197, 141, 0.25);
  background: linear-gradient(135deg, rgba(38, 30, 42, 0.6) 0%, rgba(18, 17, 24, 0.8) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.callout-badges {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.callout-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 650;
  color: var(--gold-light);
}

.callout-tag svg {
  width: 14px;
  height: 14px;
  color: var(--gold);
}

.callout-content h4 {
  font-size: 16px;
  font-weight: 650;
  color: #fff;
  margin: 0;
}

.callout-btn {
  font-size: 13px;
  min-height: 40px;
  padding: 8px 20px;
  flex-shrink: 0;
}

/* ==========================================================================
   项目介绍 (About MUSTOK)
   ========================================================================== */
.about-section {
  padding-top: 64px;
  padding-bottom: 56px;
}

.about-heading {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 60px;
  align-items: center;
}

.about-heading h2 {
  font-size: 38px;
  font-weight: 750;
  line-height: 1.35;
  letter-spacing: -0.5px;
  margin: 12px 0 0;
}

.about-intro > p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.9;
  margin: 0 0 12px;
}

.about-intro strong {
  color: var(--gold-light);
}

.about-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 20px;
}

/* 四宫格卡片 (Project Grid) */
.project-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.project-grid article {
  position: relative;
  padding: 26px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
  background: linear-gradient(145deg, rgba(32, 29, 41, 0.6) 0%, rgba(20, 19, 28, 0.8) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 8px 24px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.project-grid article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-grid article:hover {
  transform: translateY(-4px);
  border-color: var(--surface-border-hover);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 16px 36px rgba(0, 0, 0, 0.35);
}

.project-grid article:hover::before {
  opacity: 1;
}

.project-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(236, 197, 141, 0.3);
  background: linear-gradient(135deg, rgba(236, 197, 141, 0.15) 0%, rgba(236, 197, 141, 0.03) 100%);
  color: var(--gold);
  margin-bottom: 20px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: transform 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.project-icon svg {
  width: 24px;
  height: 24px;
}

.project-grid article:hover .project-icon {
  transform: scale(1.08);
  border-color: var(--gold);
  color: var(--gold-light);
  box-shadow: 0 0 20px rgba(236, 197, 141, 0.3);
}

.project-grid h3 {
  font-size: 18px;
  font-weight: 650;
  color: #fff;
  margin: 0 0 10px;
}

.project-grid p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-muted);
  margin: 0;
}

/* 适合受众专区 (Audience Strip) */
.audience-strip {
  margin-top: 36px;
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(220, 190, 155, 0.2);
  background: linear-gradient(145deg, rgba(32, 28, 42, 0.6) 0%, rgba(18, 17, 26, 0.85) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 12px 30px rgba(0, 0, 0, 0.25);
}

.audience-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 8px;
}

.audience-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 700;
  color: var(--gold-light);
  letter-spacing: 0.5px;
}

.audience-hint {
  font-size: 12px;
  color: var(--text-muted);
}

.audience-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.audience-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: rgba(14, 13, 22, 0.65);
  border: 1px solid rgba(220, 190, 155, 0.16);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.audience-card:hover {
  transform: translateY(-2px);
  border-color: rgba(236, 197, 141, 0.45);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3), 0 0 16px rgba(236, 197, 141, 0.12);
}

.aud-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(236, 197, 141, 0.2) 0%, rgba(236, 197, 141, 0.05) 100%);
  border: 1px solid rgba(236, 197, 141, 0.35);
  color: var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.aud-icon svg {
  width: 19px;
  height: 19px;
}

.aud-info {
  flex: 1;
  min-width: 0;
}

.aud-info strong {
  display: block;
  font-size: 13.5px;
  font-weight: 650;
  color: #fff;
  line-height: 1.35;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.aud-info small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.aud-arrow {
  font-size: 16px;
  color: var(--gold);
  opacity: 0.4;
  transition: opacity 0.2s ease, transform 0.2s ease;
  margin-left: auto;
}

.audience-card:hover .aud-arrow {
  opacity: 1;
  transform: translateX(2px);
}

/* ==========================================================================
   案例精选 (Featured Case: 《街角的晚风》)
   ========================================================================== */
.featured-section {
  position: relative;
  z-index: 3;
  margin-top: 20px;
}

.featured-case {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(220, 190, 155, 0.25);
  border-radius: 28px;
  background: linear-gradient(135deg, #2b2734 0%, #15161f 55%, #23202d 100%);
  box-shadow: 
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 24px 80px rgba(0, 0, 0, 0.45);
}

.case-street {
  position: absolute;
  right: 0;
  top: 0;
  width: 36%;
  height: 100%;
  opacity: 0.35;
  mask-image: linear-gradient(90deg, transparent 0%, #000 40%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 40%);
  pointer-events: none;
}

.case-top {
  position: relative;
  display: grid;
  grid-template-columns: 36% 64%;
  min-height: 380px;
}

.portrait-wrap {
  position: relative;
  overflow: hidden;
  min-height: 380px;
}

.case-portrait {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.95;
  filter: contrast(1.05);
}

.portrait-fade {
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(90deg, transparent 65%, #1d1c26 100%),
    linear-gradient(0deg, #1b1924 0%, transparent 35%);
}

.portrait-caption {
  position: absolute;
  bottom: 24px;
  left: 28px;
  right: 28px;
  font-size: 11px;
  letter-spacing: 2px;
  color: rgba(236, 197, 141, 0.7);
  text-transform: uppercase;
}

.case-copy {
  padding: 40px 40px 24px 10px;
  position: relative;
}

.outline-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  border: 1px solid var(--surface-border-hover);
  border-radius: var(--radius-full);
  padding: 4px 16px;
  color: var(--gold-light);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.8px;
  background: rgba(236, 197, 141, 0.08);
}

.case-copy h2 {
  font-size: clamp(34px, 4.2vw, 56px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.25;
  margin: 18px 0 14px;
  color: #fff;
}

.case-byline {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 15px;
  color: var(--text-secondary);
  margin: 0 0 20px;
  flex-wrap: wrap;
}

.case-byline strong {
  font-size: 26px;
  color: var(--gold-light);
}

.byline-sep {
  display: inline-block;
  width: 1px;
  height: 20px;
  background: rgba(236, 197, 141, 0.35);
}

.case-description {
  font-size: 14px;
  line-height: 1.95;
  color: var(--text-secondary);
  margin: 0;
  max-width: 680px;
}

.case-provenance {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  font-size: 11px;
  line-height: 1.6;
  margin-top: 20px;
  color: var(--text-muted);
}

.case-provenance a {
  color: var(--gold);
  border-bottom: 1px dashed rgba(236, 197, 141, 0.4);
  transition: all 0.2s ease;
}

.case-provenance a:hover {
  color: #fff;
  border-bottom-color: #fff;
}

/* 案例演进 4 阶段 (Case Steps Timeline) */
.case-steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 24px 28px;
  border-top: 1px solid rgba(220, 190, 155, 0.15);
  background: rgba(14, 15, 23, 0.4);
}

.case-step {
  position: relative;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  text-align: left;
  padding: 12px 20px 14px;
  border-right: 1px solid rgba(220, 190, 155, 0.15);
  border-radius: var(--radius-md);
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.case-step:last-child {
  border-right: 0;
}

.case-step:hover {
  background: rgba(236, 197, 141, 0.05);
}

.case-step.selected {
  background: linear-gradient(135deg, rgba(236, 197, 141, 0.14) 0%, rgba(236, 197, 141, 0.02) 100%);
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px rgba(236, 197, 141, 0.35);
}

.round-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 1px solid rgba(236, 197, 141, 0.4);
  background: linear-gradient(145deg, rgba(184, 134, 71, 0.3) 0%, rgba(35, 24, 20, 0.7) 100%);
  color: var(--gold-light);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 4px 12px rgba(0, 0, 0, 0.25);
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.round-icon svg {
  width: 26px;
  height: 26px;
}

.case-step:hover .round-icon {
  transform: scale(1.08);
  border-color: var(--gold);
  box-shadow: 0 0 20px rgba(236, 197, 141, 0.3);
}

.case-step.selected .round-icon {
  background: var(--gold-gradient);
  color: #1f150c;
  border-color: #fff;
  box-shadow: 0 0 24px rgba(236, 197, 141, 0.5);
}

.step-text {
  flex: 1;
}

.step-index {
  display: inline-block;
  font-size: 11px;
  font-family: Georgia, serif;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 1px;
  margin-bottom: 2px;
}

.case-step strong {
  display: block;
  font-size: 15px;
  line-height: 1.4;
  color: #fff;
  margin-bottom: 4px;
}

.case-step small {
  display: block;
  font-size: 11px;
  line-height: 1.7;
  color: var(--text-muted);
}

.case-step.selected strong {
  color: var(--gold-light);
}

.stage-detail {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 16px 36px 20px;
  background: rgba(10, 11, 18, 0.6);
  border-top: 1px solid rgba(220, 190, 155, 0.1);
  color: var(--text-secondary);
}

.stage-num {
  font-family: Georgia, serif;
  font-size: 26px;
  font-weight: 700;
  color: var(--gold);
  flex-shrink: 0;
}

.stage-detail p {
  font-size: 12px;
  line-height: 1.8;
  margin: 0;
}

/* ==========================================================================
   案例价值 4 步走 (Value Grid)
   ========================================================================== */
.value-section {
  padding-top: 64px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  text-align: center;
}

.line-wing {
  display: block;
  width: 70px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold));
  border-radius: 2px;
}

.line-wing.right {
  transform: rotate(180deg);
}

.section-heading h2 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
}

.section-heading h2 em {
  font-style: normal;
  color: var(--gold);
}

.section-subtitle {
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
  margin: 12px 0 32px;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.value-card {
  position: relative;
  text-align: center;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, rgba(40, 36, 48, 0.7) 0%, rgba(20, 19, 28, 0.9) 100%);
  padding: 30px 18px 26px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 8px 24px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.value-card:hover {
  transform: translateY(-5px);
  border-color: var(--surface-border-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}

.value-card .round-icon {
  margin: 0 auto 16px;
  width: 60px;
  height: 60px;
}

.value-card h3 {
  font-size: 20px;
  font-weight: 650;
  color: var(--gold-light);
  margin: 0 0 8px;
}

.value-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.value-arrow {
  position: absolute;
  right: -24px;
  top: 45%;
  transform: translateY(-50%);
  color: var(--gold);
  font-size: 36px;
  line-height: 1;
  z-index: 2;
  opacity: 0.6;
}

/* ==========================================================================
   更多AI音乐可能 (Possibilities Section)
   ========================================================================== */
.possibilities-section {
  padding-top: 64px;
}

.possibility-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.possibility-card {
  position: relative;
  overflow: hidden;
  text-align: left;
  min-height: 240px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 0;
  background: #171824;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 12px 30px rgba(0, 0, 0, 0.25);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.possibility-card:hover {
  transform: translateY(-4px);
  border-color: var(--surface-border-hover);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
}

.scenario-art {
  position: absolute;
  top: 0;
  left: 0;
  width: 68%;
  height: 100%;
  filter: contrast(1.05);
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.possibility-card:hover .scenario-art {
  transform: scale(1.08);
}

.scenario-shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 5%, rgba(26, 27, 38, 0.3) 25%, #181926 65%, #181926 100%);
}

.scenario-copy {
  position: relative;
  margin-left: 42%;
  padding: 28px 22px 24px 0;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.small-tag {
  display: inline-block;
  align-self: flex-start;
  background: var(--gold-gradient);
  border-radius: var(--radius-full);
  font-size: 11px;
  padding: 3px 12px;
  color: #24190f;
  font-weight: 700;
  margin-bottom: 14px;
}

.scenario-copy h3 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 0 0 10px;
  color: #fff;
}

.scenario-copy p {
  font-size: 12px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin: 0;
}

.mini-play {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: auto;
  align-self: flex-end;
  border: 1px solid var(--gold);
  border-radius: 50%;
  width: 34px;
  height: 34px;
  color: var(--gold);
  background: rgba(236, 197, 141, 0.08);
  transition: all 0.25s ease;
}

.possibility-card:hover .mini-play {
  background: var(--gold-gradient);
  color: #1f160e;
  transform: translateX(3px);
  box-shadow: 0 0 14px rgba(236, 197, 141, 0.4);
}

.mini-play svg {
  width: 16px;
  height: 16px;
}

.small-note {
  text-align: right;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 14px;
}

/* ==========================================================================
   创作版本体验 (Creation Versions)
   ========================================================================== */
.creation-section {
  padding-top: 56px;
  padding-bottom: 56px;
}

.creation-panel {
  display: grid;
  grid-template-columns: 32% 68%;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, rgba(35, 30, 42, 0.6) 0%, rgba(18, 19, 28, 0.9) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 16px 40px rgba(0, 0, 0, 0.3);
}

.version-tabs {
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(220, 190, 155, 0.15);
  padding: 20px;
  gap: 10px;
}

.version-tab {
  position: relative;
  text-align: left;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all 0.25s ease;
}

.version-tab:hover {
  background: rgba(236, 197, 141, 0.05);
  color: var(--text-secondary);
}

.version-tab.selected {
  background: linear-gradient(110deg, rgba(236, 197, 141, 0.16) 0%, rgba(184, 134, 71, 0.08) 100%);
  border-color: rgba(236, 197, 141, 0.35);
  color: #fff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.tab-num {
  font-family: Georgia, serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--gold);
}

.tab-text {
  flex: 1;
}

.tab-text strong {
  display: block;
  font-size: 18px;
  font-weight: 650;
  line-height: 1.3;
}

.tab-text small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}

.version-tab.selected .tab-text strong {
  color: var(--gold-light);
}

.tab-arrow {
  font-size: 16px;
  font-weight: 400;
  color: var(--gold);
  opacity: 0.6;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.version-tab:hover .tab-arrow,
.version-tab.selected .tab-arrow {
  opacity: 1;
  transform: translate(2px, -2px);
}

.version-panel {
  padding: 40px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.version-panel h3 {
  font-size: 32px;
  font-weight: 750;
  letter-spacing: -0.5px;
  margin: 12px 0 16px;
  color: #fff;
}

.version-panel > p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0;
}

.version-panel ul {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--gold-light);
  margin: 24px 0 30px;
}

.version-panel li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.version-panel li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 8px var(--gold);
}

.version-actions {
  display: flex;
  align-items: center;
  gap: 22px;
}

/* 权益与披露折叠 (Benefits Disclosures) */
.benefits-disclosures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 24px;
}

.benefits-disclosures details {
  border: 1px solid var(--surface-border);
  background: rgba(26, 24, 34, 0.6);
  border-radius: var(--radius-md);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.benefits-disclosures details:hover {
  border-color: var(--surface-border-hover);
}

.benefits-disclosures details[open] {
  border-color: var(--surface-border-hover);
  background: rgba(30, 27, 40, 0.85);
}

.benefits-disclosures summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  list-style: none;
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-light);
}

.benefits-disclosures summary::-webkit-details-marker {
  display: none;
}

.benefits-disclosures summary > span {
  display: flex;
  align-items: center;
  gap: 12px;
}

.disclosure-icon {
  width: 22px;
  height: 22px;
  color: var(--gold);
}

.toggle-indicator {
  font-size: 20px;
  font-weight: 300;
  color: var(--gold);
  transition: transform 0.25s ease;
}

.benefits-disclosures details[open] .toggle-indicator {
  transform: rotate(45deg);
}

.disclosure-content {
  padding: 0 24px 22px;
}

.disclosure-content p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin: 0 0 10px;
}

.disclosure-content strong {
  color: var(--gold-light);
}

.disclosure-content small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   合作横幅 (Cooperation Banner)
   ========================================================================== */
.cooperation-banner {
  position: relative;
  border-top: 1px solid rgba(220, 190, 155, 0.25);
  border-bottom: 1px solid rgba(220, 190, 155, 0.15);
  background: linear-gradient(110deg, #38241c 0%, #15141e 50%, #251722 100%);
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.cooperation-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 32px;
  min-height: 230px;
  padding-left: 260px;
}

.headphone-art {
  position: absolute;
  left: -20px;
  top: 0;
  width: 260px;
  height: 100%;
  pointer-events: none;
  filter: contrast(1.1);
}

.cooperation-copy {
  flex: 1;
}

.cooperation-copy h2 {
  font-size: 28px;
  font-weight: 750;
  line-height: 1.45;
  margin: 0 0 20px;
  color: #fff;
}

.cooperation-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.cooperation-tags > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--gold-light);
  border: 1px solid rgba(236, 197, 141, 0.25);
  background: rgba(22, 17, 24, 0.6);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  backdrop-filter: blur(8px);
  transition: all 0.2s ease;
}

.cooperation-tags > span:hover {
  border-color: var(--gold);
  background: rgba(236, 197, 141, 0.12);
  transform: translateY(-1px);
}

.cooperation-tags svg {
  width: 17px;
  height: 17px;
  color: var(--gold);
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.site-footer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 40px 0 48px;
  border-top: 1px solid var(--line);
}

.site-footer .brand {
  font-size: 20px;
}

.site-footer .brand-mark {
  width: 26px;
  height: 26px;
}

.site-footer > p {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-links a, .footer-links button {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-links a:hover, .footer-links button:hover {
  color: var(--gold);
}

.site-footer > small {
  grid-column: 1 / -1;
  font-size: 11px;
  color: rgba(142, 135, 128, 0.8);
  line-height: 1.8;
  margin-top: 10px;
}

/* ==========================================================================
   模态弹窗系统 (Modern Modal & Dialog)
   ========================================================================== */
.modal {
  position: fixed;
  inset: 0;
  width: min(660px, calc(100% - 40px));
  max-height: calc(100dvh - 64px);
  overflow-y: auto;
  margin: auto;
  border: 1px solid var(--surface-border-hover);
  border-radius: var(--radius-lg);
  padding: 40px;
  background: linear-gradient(145deg, #27222d 0%, #15161f 100%);
  color: var(--text);
  box-shadow: 
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 30px 100px rgba(0, 0, 0, 0.7);
  animation: modalScaleIn 0.28s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalScaleIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal::backdrop {
  background: rgba(6, 6, 12, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.modal-close {
  position: absolute;
  right: 18px;
  top: 18px;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: rgba(236, 197, 141, 0.2);
  color: #fff;
  transform: rotate(90deg);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal h2 {
  font-size: 28px;
  font-weight: 750;
  line-height: 1.4;
  margin: 18px 0 12px;
  color: #fff;
}

.modal-lead {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.85;
  margin: 0 0 24px;
}

/* 时间线列表 */
.story-timeline {
  list-style: none;
  margin: 28px 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.story-timeline li {
  display: flex;
  gap: 20px;
}

.story-timeline li > b {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex: none;
  border: 1px solid var(--gold);
  border-radius: 50%;
  color: var(--gold-light);
  font-family: Georgia, serif;
  font-size: 18px;
  background: rgba(236, 197, 141, 0.1);
  box-shadow: 0 0 12px rgba(236, 197, 141, 0.2);
}

.story-timeline h3 {
  font-size: 16px;
  font-weight: 650;
  color: #fff;
  margin: 2px 0 6px;
}

.story-timeline p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0;
}

.modal-note {
  font-size: 12px;
  line-height: 1.8;
  padding: 16px 20px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  background: rgba(18, 16, 24, 0.6);
}

.modal-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.scenario-list {
  font-size: 14px;
  line-height: 2.2;
  color: var(--gold-light);
  padding-left: 20px;
  margin: 0 0 24px;
}

/* 表单样式 */
#brief-form {
  display: grid;
  gap: 16px;
}

.modal label {
  display: grid;
  gap: 8px;
  font-size: 13px;
  font-weight: 550;
  color: var(--gold-light);
}

.modal label > span {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  display: inline;
}

.modal input, .modal select, .modal textarea {
  width: 100%;
  border: 1px solid rgba(220, 190, 155, 0.25);
  border-radius: var(--radius-md);
  color: #fff;
  background: rgba(14, 15, 22, 0.8);
  outline: none;
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.7;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.modal input:focus, .modal select:focus, .modal textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 16px rgba(236, 197, 141, 0.2);
}

.modal textarea {
  resize: vertical;
}

.modal input::placeholder, .modal textarea::placeholder {
  color: var(--text-muted);
}

.form-note {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0;
}

#brief-result h3 {
  font-size: 18px;
  color: var(--gold-light);
  margin-top: 0;
}

#brief-text {
  min-height: 200px;
  font-size: 13px;
  font-family: inherit;
}

/* App 下载选项 */
.download-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 24px;
}

.download-option {
  position: relative;
  display: block;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  background: rgba(236, 197, 141, 0.05);
  transition: all 0.25s ease;
}

.download-option:hover {
  border-color: var(--gold);
  background: rgba(236, 197, 141, 0.12);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.os-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.os-icon {
  width: 22px;
  height: 22px;
  color: var(--gold);
}

.download-os {
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 2px;
}

.download-option strong {
  display: block;
  font-size: 16px;
  color: #fff;
  line-height: 1.5;
}

.download-option small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 4px;
}

.download-arrow {
  position: absolute;
  right: 18px;
  top: 20px;
  color: var(--gold);
  font-size: 18px;
  opacity: 0.7;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.download-arrow svg {
  width: 20px;
  height: 20px;
}

.download-option:hover .download-arrow {
  opacity: 1;
  transform: translate(2px, -2px);
}

.web-experience {
  width: 100%;
  margin: 22px 0 14px;
  min-height: 46px;
}

/* ==========================================================================
   移动端专属吸底操作栏 (Mobile Action Bar)
   ========================================================================== */
.mobile-action {
  display: none;
}

/* ==========================================================================
   响应式断点适配 (Responsive Media Queries)
   ========================================================================== */

/* 宽屏优化 (Min 1440px) */
@media (min-width: 1440px) {
  .hero {
    min-height: 560px;
  }
  .hero-content {
    padding-top: 80px;
    padding-bottom: 96px;
  }
}

/* 中大屏幕 (Max 1180px) */
@media (max-width: 1180px) {
  .desktop-nav {
    gap: 22px;
  }
  .desktop-nav a {
    font-size: 13px;
  }
  .about-heading {
    gap: 40px;
  }
  .about-heading h2 {
    font-size: 32px;
  }
  .project-grid {
    gap: 16px;
  }
  .project-grid article {
    padding: 20px 18px;
  }
  .case-copy h2 {
    font-size: 46px;
  }
  .case-step {
    padding: 10px 14px;
  }
  .round-icon {
    width: 48px;
    height: 48px;
  }
  .round-icon svg {
    width: 22px;
    height: 22px;
  }
  .cooperation-inner {
    padding-left: 210px;
  }
}

/* 平板屏幕 (Max 960px) */
@media (max-width: 960px) {
  .privileges-grid {
    gap: 20px;
  }
  .desktop-nav {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  .nav-wrap {
    height: 68px;
  }
  .hero {
    min-height: 460px;
  }
  .hero-art {
    width: 75%;
    opacity: 0.75;
  }
  .hero h1 {
    font-size: 44px;
  }
  .about-heading {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .about-heading h2 {
    font-size: 30px;
  }
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .case-top {
    grid-template-columns: 38% 62%;
  }
  .case-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .case-step:nth-child(2) {
    border-right: 0;
  }
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .value-arrow {
    display: none;
  }
  .possibility-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .possibility-card {
    min-height: 220px;
  }
  .scenario-copy {
    margin-left: 36%;
  }
  .creation-panel {
    grid-template-columns: 1fr;
  }
  .version-tabs {
    flex-direction: row;
    border-right: 0;
    border-bottom: 1px solid rgba(220, 190, 155, 0.15);
    padding: 14px;
  }
  .version-tab {
    flex: 1;
    padding: 12px 14px;
  }
  .version-tab .tab-arrow {
    display: none;
  }
  .version-panel {
    padding: 32px 28px;
  }
  .cooperation-inner {
    padding-left: 170px;
    flex-wrap: wrap;
    gap: 20px;
    padding-block: 30px;
  }
  .headphone-art {
    width: 200px;
  }
}

/* 手机竖屏 (Max 640px) */
@media (max-width: 640px) {
  .privileges-section {
    padding-top: 36px;
    padding-bottom: 20px;
  }
  .privileges-header {
    margin-bottom: 24px;
  }
  .privileges-header h2 {
    font-size: 25px;
  }
  .privileges-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .privilege-card {
    padding: 24px 20px 22px;
  }
  .privilege-metric-box {
    padding: 14px 16px;
    gap: 14px;
  }
  .metric-icon-wrap {
    width: 48px;
    height: 48px;
  }
  .metric-icon-wrap svg {
    width: 24px;
    height: 24px;
  }
  .metric-number strong {
    font-size: 25px;
  }
  .metric-number.prize-gradient strong {
    font-size: 21px;
  }
  .prize-hierarchy {
    gap: 8px;
  }
  .prize-item {
    padding: 10px 14px;
  }
  .creation-privilege-callout {
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 20px;
  }
  .callout-btn {
    width: 100%;
  }
  html {
    scroll-padding-top: 80px;
  }
  .container {
    width: calc(100% - 32px);
  }
  .nav-wrap {
    width: calc(100% - 32px);
    height: 62px;
  }
  .nav-actions .nav-cta {
    display: none;
  }
  .brand {
    font-size: 20px;
    gap: 8px;
  }
  .brand-mark {
    width: 28px;
    height: 28px;
  }
  .hero {
    min-height: 480px;
  }
  .hero-content {
    padding-top: 40px;
    padding-bottom: 60px;
  }
  .hero h1 {
    font-size: 36px;
    letter-spacing: -1px;
  }
  .hero-cross {
    margin: 0 8px;
  }
  .hero-content > p {
    font-size: 14px;
    line-height: 1.8;
  }
  .hero-actions {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: nowrap;
    gap: 10px;
    width: 100%;
    max-width: 100%;
  }
  .hero-actions .button {
    flex: 1 1 0%;
    min-width: 0;
    min-height: 44px;
    padding: 0 8px;
    font-size: 13px;
    gap: 6px;
    white-space: nowrap;
    justify-content: center;
  }
  .hero-actions .btn-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
  }
  .hero-actions .play-circle {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
  }
  .hero-actions .play-circle svg {
    width: 11px;
    height: 11px;
  }
  .equalizer {
    display: none;
  }
  .scroll-cue {
    display: none;
  }
  .about-heading h2 {
    font-size: 26px;
  }
  .project-grid {
    grid-template-columns: 1fr;
  }
  .audience-strip {
    margin-top: 24px;
    padding: 18px 16px;
  }
  .audience-header {
    margin-bottom: 12px;
  }
  .audience-hint {
    display: none;
  }
  .audience-cards {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .audience-card {
    padding: 12px 14px;
    gap: 12px;
  }
  .aud-icon {
    width: 36px;
    height: 36px;
  }
  .aud-icon svg {
    width: 17px;
    height: 17px;
  }
  .aud-info strong {
    font-size: 13px;
  }
  .aud-info small {
    font-size: 10.5px;
  }
  .case-top {
    display: block;
  }
  .portrait-wrap {
    min-height: 240px;
    height: 240px;
  }
  .case-copy {
    padding: 24px 20px 20px;
  }
  .case-copy h2 {
    font-size: 34px;
  }
  .case-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    padding: 16px 14px 12px;
  }
  .case-step {
    border-right: 0;
    border-bottom: 0;
    border: 1px solid rgba(220, 190, 155, 0.16);
    border-radius: var(--radius-md);
    background: rgba(22, 20, 30, 0.6);
    padding: 12px 10px;
    gap: 10px;
    align-items: center;
  }
  .case-step:last-child {
    border-bottom: 1px solid rgba(220, 190, 155, 0.16);
  }
  .case-step.selected {
    border-color: rgba(236, 197, 141, 0.45);
    background: linear-gradient(135deg, rgba(236, 197, 141, 0.16) 0%, rgba(28, 24, 34, 0.8) 100%);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3), 0 0 20px rgba(236, 197, 141, 0.15);
  }
  .case-step .round-icon {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
  }
  .case-step .round-icon svg {
    width: 18px;
    height: 18px;
  }
  .case-step .step-index {
    font-size: 10px;
    margin-bottom: 1px;
  }
  .case-step strong {
    font-size: 13.5px;
    line-height: 1.3;
    margin-bottom: 2px;
  }
  .case-step small {
    font-size: 10px;
    line-height: 1.4;
    color: var(--text-muted);
  }
  .stage-detail {
    padding: 12px 16px 16px;
    margin: 0 14px 14px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(236, 197, 141, 0.2);
    background: rgba(18, 17, 26, 0.85);
    gap: 12px;
  }
  .stage-num {
    font-size: 20px;
  }
  .section-heading {
    gap: 8px;
  }
  .section-heading h2 {
    font-size: clamp(14px, 4.3vw, 18px);
    white-space: nowrap;
    letter-spacing: -0.2px;
  }
  .line-wing {
    width: 20px;
    flex-shrink: 1;
  }
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .value-card {
    padding: 20px 10px 18px;
    border-radius: var(--radius-md);
  }
  .value-card .round-icon {
    width: 46px;
    height: 46px;
    margin-bottom: 12px;
  }
  .value-card .round-icon svg {
    width: 22px;
    height: 22px;
  }
  .value-card h3 {
    font-size: 16px;
    margin: 0 0 6px;
  }
  .value-card p {
    font-size: 11px;
    line-height: 1.65;
  }
  .possibility-card {
    min-height: 200px;
  }
  .scenario-copy {
    margin-left: 42%;
    padding: 20px 16px 18px 0;
  }
  .scenario-copy h3 {
    font-size: 19px;
  }
  .version-tabs {
    flex-direction: column;
    gap: 6px;
  }
  .version-panel {
    padding: 24px 20px;
  }
  .version-panel h3 {
    font-size: 24px;
  }
  .benefits-disclosures {
    grid-template-columns: 1fr;
  }
  .cooperation-inner {
    padding: 28px 20px;
    min-height: auto;
  }
  .headphone-art {
    display: none;
  }
  .cooperation-copy h2 {
    font-size: 22px;
  }
  .site-footer {
    grid-template-columns: 1fr;
    gap: 18px;
    padding-bottom: 100px;
  }
  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }
  .download-options {
    grid-template-columns: 1fr;
  }
  .modal {
    padding: 28px 20px;
    border-radius: var(--radius-md);
  }

  /* 移动端底部悬浮吸底条 */
  .mobile-action {
    position: fixed;
    display: flex;
    gap: 10px;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 45;
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
    background: rgba(12, 13, 20, 0.94);
    border-top: 1px solid rgba(220, 190, 155, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }

  .mobile-action button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 650;
  }

  .mobile-download {
    flex: 1;
    gap: 8px;
  }

  .mobile-coop {
    flex: 0 0 110px;
    border: 1px solid var(--surface-border-hover);
    color: var(--gold-light);
    background: rgba(236, 197, 141, 0.08);
  }
}

/* 超窄屏幕适配 (Max 380px) */
@media (max-width: 380px) {
  .hero-actions {
    gap: 6px;
  }
  .hero-actions .button {
    font-size: 12px;
    padding: 0 5px;
  }
  .hero-actions .btn-sub-text {
    display: none;
  }
  .case-steps {
    gap: 8px;
    padding: 12px 10px 10px;
  }
  .case-step {
    padding: 10px 8px;
    gap: 8px;
  }
  .case-step .round-icon {
    width: 34px;
    height: 34px;
  }
  .case-step .round-icon svg {
    width: 16px;
    height: 16px;
  }
  .case-step strong {
    font-size: 12.5px;
  }
  .case-step small {
    font-size: 9.5px;
  }
  .stage-detail {
    margin: 0 10px 12px;
    padding: 10px 12px 14px;
  }
  .section-heading {
    gap: 5px;
  }
  .section-heading h2 {
    font-size: 13.5px;
    letter-spacing: -0.4px;
  }
  .line-wing {
    width: 14px;
  }
  .value-grid {
    gap: 8px;
  }
  .value-card {
    padding: 16px 6px 14px;
  }
  .value-card h3 {
    font-size: 15px;
  }
  .value-card p {
    font-size: 10.5px;
  }
}

/* 动效友好偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}