/* ============================================================
   股息罐罐 — 官网样式
   暖色深底 + 橙色科技风
   ============================================================ */

:root {
  /* 黑底 + 品牌橙（冷中性黑，不是暖棕黑，让橙不发黄） */
  --bg-0: #000000;        /* 纯黑（footer / 极底） */
  --bg-1: #050507;        /* 主体几乎黑（极冷，零暖调） */
  --bg-2: #0C0C12;        /* 卡片底 */
  --bg-3: #15151E;        /* elevated */
  --surface: rgba(255, 255, 255, 0.025);
  --surface-2: rgba(255, 255, 255, 0.05);

  /* 主色：H5 / 小程序 同款品牌橙 */
  --accent: #FF6B35;       /* primary 品牌橙 */
  --accent-2: #FF8E5A;     /* 浅橙 / hover */
  --accent-3: #E84A0E;     /* 深橙 */
  --accent-glow: rgba(255, 107, 53, 0.32);

  /* 兼容别名 */
  --brand: var(--accent);
  --brand-2: var(--accent-2);
  --brand-3: var(--accent-3);
  --brand-glow: var(--accent-glow);
  --gold: var(--accent-2);
  --gold-soft: var(--accent);

  --text: #ECECEF;          /* 冷中性白 */
  --text-mute: #8A8A92;
  --text-soft: #4C4C54;
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --container: 1200px;
  --shadow-card: 0 24px 60px -24px rgba(0, 0, 0, 0.65), 0 1px 0 rgba(255, 255, 255, 0.04) inset;
  --shadow-glow: 0 0 64px -8px var(--brand-glow);

  --easing: cubic-bezier(0.22, 1, 0.36, 1);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  /* 主题 token —— 全部纯色或同色相，零彩色 */
  --nav-bg: rgba(0, 0, 0, 0.82);
  --btn-primary-bg: linear-gradient(135deg, #FF8E5A 0%, #FF6B35 60%, #E84A0E 100%);
  --btn-primary-bg-hover: linear-gradient(135deg, #FFA075 0%, #FF7A4A 60%, #F25A1F 100%);
  --btn-primary-fg: #FFFFFF;
  --btn-primary-shadow: rgba(255, 107, 53, 0.45);
  --btn-primary-shadow-hover: rgba(255, 107, 53, 0.6);
  --btn-primary-inset: rgba(255, 255, 255, 0.18);
  --btn-primary-inset-hover: rgba(255, 255, 255, 0.28);
  --grad-stop-1: #FFB58A;       /* 浅橙 */
  --grad-stop-2: #FF6B35;       /* 主橙 */
  --grad-stop-3: #B83708;       /* 深橙 */
  --hero-orb-1: rgba(255, 107, 53, 0.14);
  --hero-orb-2: rgba(255, 142, 90, 0.08);
  --hero-grid-line: rgba(255, 255, 255, 0.03);
  --card-bg-1: rgba(255, 255, 255, 0.03);
  --card-bg-2: rgba(255, 255, 255, 0.01);
  --pill-bg: rgba(255, 255, 255, 0.035);
  --about-bg-1: rgba(255, 255, 255, 0.025);
  --about-bg-2: rgba(255, 255, 255, 0.008);
  --about-radial: rgba(255, 107, 53, 0.13);
  --cta-bg: linear-gradient(135deg, #0C0C12 0%, #000000 100%);
  --cta-radial-1: rgba(255, 107, 53, 0.20);
  --cta-radial-2: rgba(255, 142, 90, 0.10);
}

/* 尊重系统"减少动画"偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: auto;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background: var(--bg-1);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--text); color: var(--bg-1); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   顶部导航
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  background: var(--nav-bg);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--easing), backdrop-filter 0.3s var(--easing);
}
.nav.is-scrolled {
  border-bottom-color: var(--border);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.brand-domain {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-soft);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding-left: 10px;
  border-left: 1px solid var(--border);
}
.brand-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text);
}
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  position: relative;
  font-size: 14px;
  color: var(--text-mute);
  padding: 4px 0;
  transition: color 0.2s var(--easing);
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--text);
  transform: translateX(-50%);
  transition: width 0.3s var(--easing);
}
.nav-links a.is-active {
  color: var(--text);
}
.nav-links a.is-active::after {
  width: 100%;
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-fg);
  font-weight: 600;
  font-size: 13px;
  box-shadow: 0 6px 18px -8px var(--btn-primary-shadow);
  transition: transform 0.2s var(--easing), background 0.2s var(--easing), box-shadow 0.2s var(--easing);
}
.nav-cta:hover {
  transform: translateY(-1px);
  background: var(--btn-primary-bg-hover);
  box-shadow: 0 10px 26px -6px var(--btn-primary-shadow-hover);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  padding: 140px 0 160px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: -10% -10% auto -10%;
  height: 100%;
  background:
    radial-gradient(55% 50% at 78% 12%, var(--hero-orb-1) 0%, transparent 60%),
    radial-gradient(45% 50% at 18% 60%, var(--hero-orb-2) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
}
.hero-text {
  max-width: 760px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--text-mute);
  text-transform: uppercase;
}
.badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

h1 {
  margin: 28px 0 24px;
  font-size: clamp(44px, 6.4vw, 84px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.035em;
}
.grad {
  background: linear-gradient(120deg, var(--grad-stop-1) 0%, var(--grad-stop-2) 50%, var(--grad-stop-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  margin: 0 0 14px;
  font-size: clamp(16px, 1.4vw, 18px);
  color: var(--text-mute);
  line-height: 1.7;
  max-width: 580px;
}
.lead-quote {
  margin: 0 0 36px;
  font-size: 13px;
  color: var(--text-soft);
  letter-spacing: 2px;
  font-family: var(--font-mono);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
  justify-content: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
  border: 1px solid transparent;
  transition: transform 0.2s var(--easing), box-shadow 0.2s var(--easing),
    border-color 0.2s var(--easing), background 0.2s var(--easing);
}
.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-fg);
  box-shadow: 0 16px 40px -14px var(--btn-primary-shadow), 0 0 0 1px var(--btn-primary-inset) inset;
}
.btn-primary:hover {
  transform: translateY(-2px);
  background: var(--btn-primary-bg-hover);
  box-shadow: 0 22px 50px -14px var(--btn-primary-shadow-hover), 0 0 0 1px var(--btn-primary-inset-hover) inset;
}
.btn-ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--surface);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover {
  border-color: var(--text-mute);
  background: var(--surface-2);
}

/* hero meta inline （单列居中布局后已废弃 hero-visual） */
.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  font-size: 12px;
  color: var(--text-soft);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero-meta i {
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-soft);
}

/* Hero 静态光球（不动，纯氛围） */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}
.orb-1 {
  width: 420px; height: 420px;
  left: 6%; top: 4%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
}
.orb-2 {
  width: 320px; height: 320px;
  right: 8%; bottom: 8%;
  background: radial-gradient(circle, var(--hero-orb-1) 0%, transparent 70%);
}

/* ============================================================
   Section common
   ============================================================ */
section { position: relative; }
.sec-head {
  text-align: center;
  margin-bottom: 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.sec-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--brand);
  text-transform: uppercase;
}
.sec-head h2 {
  margin: 0;
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  max-width: 760px;
}
.sec-sub {
  margin: 4px 0 0;
  color: var(--text-mute);
  font-size: 15px;
  max-width: 600px;
}
.sec-note {
  display: inline-block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--text-soft);
  text-transform: uppercase;
}

/* ============================================================
   Features grid
   ============================================================ */
.features {
  padding: 120px 0 80px;
}
.grid-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.card {
  position: relative;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--card-bg-1) 0%, var(--card-bg-2) 100%);
  border: 1px solid var(--border-strong);
  overflow: hidden;
  transition: transform 0.3s var(--easing), border-color 0.3s var(--easing);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "title  icon"
    "desc   desc";
  column-gap: 14px;
  row-gap: 14px;
  align-content: start;
}
.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, transparent 0%, var(--brand) 100%);
  opacity: 0;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  transition: opacity 0.3s var(--easing);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-3px);
  border-color: transparent;
}
.card:hover::before { opacity: 1; }

.card-icon {
  grid-area: icon;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(255, 169, 104, 0.15) 0%, rgba(255, 107, 53, 0.05) 100%);
  border: 1px solid rgba(255, 169, 104, 0.25);
  color: var(--brand-2);
  align-self: start;
}
.card-icon svg { width: 22px; height: 22px; }

.card-title {
  grid-area: title;
  align-self: center;
  font-size: 20px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.card-desc {
  grid-area: desc;
  margin: 0;
  font-size: 14px;
  color: var(--text-mute);
  line-height: 1.7;
}
/* ============================================================
   App Preview (placeholder, swap to real screenshots)
   ============================================================ */
.preview { padding: 40px 0 80px; }
.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  justify-items: center;
}
.preview-phone { margin: 0; text-align: center; }
.preview-frame {
  width: 260px;
  aspect-ratio: 260 / 540;
  border-radius: 42px;
  background: linear-gradient(155deg, #20232E 0%, #0E1018 60%);
  border: 1px solid rgba(255, 255, 255, 0.10);
  padding: 8px;
  position: relative;
  box-shadow:
    0 40px 80px -28px rgba(0, 0, 0, 0.55),
    0 0 60px -16px var(--accent-glow),
    0 1px 0 rgba(255, 255, 255, 0.08) inset;
  overflow: hidden;
  transition: transform 0.4s var(--easing);
}
.preview-phone:hover .preview-frame {
  transform: translateY(-6px);
}
.preview-frame::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: 78px;
  height: 18px;
  border-radius: 999px;
  background: #050302;
  z-index: 2;
}
.preview-frame img,
.preview-empty {
  width: 100%;
  height: 100%;
  border-radius: 28px;
  display: block;
  object-fit: cover;
}
.preview-empty {
  background:
    radial-gradient(60% 80% at 50% 0%, rgba(255, 107, 53, 0.16) 0%, transparent 60%),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.035) 0 2px, transparent 2px 14px),
    linear-gradient(170deg, #16191F 0%, #0A0C12 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 1px;
}
.preview-empty-mark {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #FFE4A6 0%, #FFB347 50%, #B5560E 100%);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.35);
  display: grid;
  place-items: center;
  position: relative;
}
.preview-empty-mark::after {
  content: "¥";
  font-size: 24px;
  font-weight: 700;
  color: #5A2F08;
}
.preview-phone figcaption {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-mute);
  letter-spacing: 0.5px;
}

/* ============================================================
   Platforms
   ============================================================ */
.platforms { padding: 80px 0 100px; }
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.platform {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--easing);
}
.platform:hover { transform: translateY(-3px); }
.platform-tag {
  position: absolute;
  top: 18px;
  right: 18px;
  font-size: 10px;
  letter-spacing: 1px;
  padding: 3px 8px;
  border-radius: 6px;
  text-transform: uppercase;
}
.platform-tag.live { background: rgba(76, 195, 138, 0.12); color: #4CC38A; border: 1px solid rgba(76, 195, 138, 0.3); }
.platform-tag.soon { background: rgba(255, 169, 104, 0.12); color: var(--gold); border: 1px solid rgba(255, 169, 104, 0.3); }
.platform-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(255, 169, 104, 0.18) 0%, rgba(255, 107, 53, 0.06) 100%);
  border: 1px solid rgba(255, 169, 104, 0.25);
  color: var(--brand-2);
  margin-bottom: 18px;
}
.platform-icon svg { width: 28px; height: 28px; }
.platform-title { font-size: 18px; font-weight: 700; margin: 0 0 6px; }
.platform-domain {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
  margin-bottom: 12px;
}
.platform-desc { margin: 0 0 16px; font-size: 13px; color: var(--text-mute); line-height: 1.7; }
.platform-cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--brand);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--easing);
}
.platform-cta:hover { border-bottom-color: var(--brand); }

/* ============================================================
   About
   ============================================================ */
.about { padding: 80px 0 100px; }
.about-card {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(60% 80% at 100% 0%, var(--about-radial) 0%, transparent 60%),
    linear-gradient(180deg, var(--about-bg-1) 0%, var(--about-bg-2) 100%);
  border: 1px solid var(--border-strong);
  text-align: center;
}
.about-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 18px;
  filter: drop-shadow(0 8px 24px rgba(255, 107, 53, 0.4));
}
.about-name {
  font-size: 22px;
  font-weight: 800;
  margin: 0 0 24px;
  background: linear-gradient(135deg, var(--gold-soft) 0%, var(--brand) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.about-text {
  font-size: 15px;
  color: var(--text-mute);
  line-height: 2;
  max-width: 600px;
  margin: 0 auto;
}
.about-text strong { color: var(--text); font-weight: 600; }
.about-promise {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.promise-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  background: var(--pill-bg);
  border: 1px solid var(--border);
  color: var(--text);
}
.promise-pill::before {
  content: "✓";
  color: var(--brand);
  font-weight: 700;
}

/* ============================================================
   Final CTA
   ============================================================ */
.cta-banner { padding: 60px 0 100px; }
.cta-card {
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 40px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(50% 80% at 0% 100%, var(--cta-radial-1) 0%, transparent 70%),
    radial-gradient(40% 80% at 100% 0%, var(--cta-radial-2) 0%, transparent 70%),
    var(--cta-bg);
  border: 1px solid var(--border-strong);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-card h3 {
  margin: 0 0 12px;
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.cta-card p { margin: 0 auto 28px; max-width: 520px; color: var(--text-mute); }
.cta-card .hero-cta { justify-content: center; }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-0);
  padding: 56px 0 32px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}
.foot-brand { max-width: 320px; }
.foot-logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
}
.foot-logo strong {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text);
}
.foot-logo span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-soft);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding-left: 10px;
  border-left: 1px solid var(--border);
}
.foot-tagline { font-size: 13px; color: var(--text-soft); line-height: 1.7; }

.foot-col h4 {
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 16px;
  font-weight: 600;
}
.foot-col ul { list-style: none; margin: 0; padding: 0; }
.foot-col li { margin-bottom: 10px; }
.foot-col a {
  font-size: 13px;
  color: var(--text-soft);
  transition: color 0.2s var(--easing);
}
.foot-col a:hover { color: var(--brand); }

.foot-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-soft);
}
.foot-beian {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}
.foot-beian a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-soft);
  transition: color 0.2s var(--easing);
}
.foot-beian a:hover { color: var(--gold); }
.foot-beian img { width: 14px; height: 14px; }

/* ============================================================
   Reveal on scroll
   ============================================================ */
/* 默认：不做任何进场动画，元素就在那（兼容老浏览器） */
[data-reveal] {
  opacity: 1;
  transform: none;
}

/* 现代浏览器：跟随滚动位置 fade-in / fade-out */
@supports (animation-timeline: view()) {
  [data-reveal] {
    animation: scroll-fade linear both;
    animation-timeline: view();
    animation-range: cover 0% cover 100%;
  }
  @keyframes scroll-fade {
    0%   { opacity: 0; transform: translateY(40px); }
    18%  { opacity: 1; transform: translateY(0); }
    82%  { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(-40px); }
  }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual { order: 2; min-height: 320px; }
  .hero-illu { width: min(360px, 70%); }
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
  .preview-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .preview-frame { width: 200px; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-inner { padding: 0 16px; }
  .nav-links { display: none; }
  .container { padding: 0 16px; }
  .hero { padding: 48px 0 64px; }
  h1 { font-size: 36px; }
  .lead { font-size: 15px; }
  .btn { width: 100%; }
  .hero-cta { flex-direction: column; }
  .grid-cards { grid-template-columns: 1fr; }
  .card { padding: 24px; }
  .preview-grid { grid-template-columns: 1fr; gap: 32px; }
  .preview-frame { width: 240px; }
  .platform-grid { grid-template-columns: 1fr; }
  .about-card { padding: 36px 24px; }
  .cta-card { padding: 40px 20px; }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }
  .foot-bottom { flex-direction: column; align-items: flex-start; gap: 12px; }
  .features { padding: 80px 0 40px; }
  .preview { padding: 20px 0 60px; }
  .platforms { padding: 60px 0 60px; }
  .about { padding: 60px 0 60px; }
}



/* ============================================================
   Preview Screens — 真机截图替换 mock
   - 浅色系统：picture <source> 选 -light.jpg
   - 深色系统：fallback <img> 用 -dark.jpg
   ============================================================ */
.preview-screen-img {
  display: block;
  width: 100%;
  height: 100%;
  padding: 8px;
  border-radius: 34px;
  background: #050608;
  position: relative;
}
.preview-screen-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  border-radius: 22px;
  display: block;
}