/* ===========================================================
   E站 EhViewer — 官网介绍页  styles.css
   配色取自 Logo：青绿 / Teal
   =========================================================== */

/* ---------- 变量 & 重置 ---------- */
:root {
  --teal-50:  #F0FDFA;
  --teal-100: #CCFBF1;
  --teal-200: #99F6E4;
  --teal-300: #5EEAD4;
  --teal-400: #2DD4BF;
  --teal-500: #14B8A6;   /* 主色 */
  --teal-600: #0D9488;
  --teal-700: #0F766E;
  --teal-800: #115E59;
  --teal-900: #134E4A;

  --ink-900: #0B1B1A;
  --ink-800: #122625;
  --ink-700: #1F3A38;
  --gray-600:#475569;
  --gray-500:#64748B;
  --gray-400:#94A3B8;
  --gray-300:#CBD5E1;
  --gray-200:#E2E8F0;
  --gray-100:#F1F5F9;
  --white:   #FFFFFF;

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

  --shadow-soft: 0 6px 24px rgba(15, 118, 110, .08);
  --shadow-mid:  0 12px 40px rgba(15, 118, 110, .14);
  --shadow-lg:   0 20px 60px rgba(15, 118, 110, .22);
  --shadow-glow: 0 0 60px rgba(20, 184, 166, .35);

  --container: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica,
               Arial, sans-serif;
  color: var(--ink-900);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

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

button { font-family: inherit; cursor: pointer; border: 0; background: none; }

h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.01em; }

p { margin: 0; }

/* ---------- 通用容器 ---------- */
.section-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}
.section-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--teal-700);
  background: var(--teal-100);
  padding: 6px 14px;
  border-radius: 999px;
  letter-spacing: .04em;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.25;
  margin-bottom: 14px;
}
.section-desc {
  font-size: 16px;
  color: var(--gray-500);
}

/* ===========================================================
   顶部导航
   =========================================================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: all .3s ease;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(15, 118, 110, .08);
}
.navbar.scrolled {
  box-shadow: var(--shadow-soft);
}

.nav-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink-900);
}
.nav-logo {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
  /* img src 留空时的占位样式 */
  border: 2px solid rgba(20,184,166,.35);
}
.nav-title {
  font-size: 16px;
  letter-spacing: -0.01em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-600);
  padding: 8px 14px;
  border-radius: 999px;
  transition: all .2s ease;
}
.nav-link:hover { color: var(--teal-700); background: var(--teal-50); }
.nav-cta {
  color: var(--white);
  background: var(--teal-500);
  padding: 8px 18px;
  box-shadow: 0 4px 14px rgba(20,184,166,.35);
}
.nav-cta:hover {
  background: var(--teal-600);
  color: var(--white);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px; height: 40px;
  padding: 10px;
  border-radius: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink-900);
  border-radius: 2px;
  transition: all .3s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================================================
   首屏 Hero
   =========================================================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 140px 0 100px;
  background:
    radial-gradient(ellipse 60% 50% at 20% 20%, rgba(20,184,166,.18), transparent 70%),
    radial-gradient(ellipse 50% 50% at 90% 80%, rgba(20,184,166,.10), transparent 70%),
    linear-gradient(180deg, #F8FFFE 0%, #FFFFFF 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(20,184,166,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,184,166,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, #000 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, #000 40%, transparent 80%);
}

.hero-container {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 60px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--teal-700);
  background: rgba(20,184,166,.10);
  border: 1px solid rgba(20,184,166,.20);
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 24px;
}
.badge::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal-500);
  box-shadow: 0 0 0 4px rgba(20,184,166,.20);
}

.hero-title {
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--ink-900) 40%, var(--teal-700) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 16px;
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-meta {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  padding: 14px 22px;
  background: rgba(255,255,255,.85);
  border: 1px solid rgba(15,118,110,.12);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  box-shadow: var(--shadow-soft);
}
.meta-item { display: flex; flex-direction: column; gap: 4px; }
.meta-label { font-size: 12px; color: var(--gray-400); font-weight: 500; }
.meta-value { font-size: 16px; font-weight: 700; color: var(--teal-700); font-family: "SF Mono", Consolas, monospace; }
.meta-divider { width: 1px; height: 30px; background: var(--gray-200); }

/* 按钮 */
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
  box-shadow: 0 8px 28px rgba(20,184,166,.45), inset 0 1px 0 rgba(255,255,255,.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(20,184,166,.55), inset 0 1px 0 rgba(255,255,255,.3);
}
.btn-ghost {
  color: var(--teal-700);
  background: var(--teal-50);
  border: 1px solid rgba(20,184,166,.20);
}
.btn-ghost:hover { background: var(--teal-100); }
.btn-lg { padding: 16px 34px; font-size: 16px; }

/* 三张截图叠加 */
.hero-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.screenshot-wrap {
  position: relative;
  width: 320px;
  height: 640px;
}

.phone {
  position: absolute;
  width: 230px;
  height: 480px;
  border-radius: 38px;
  background: linear-gradient(145deg, #1F3A38, #0B1B1A);
  padding: 10px;
  box-shadow:
    0 25px 60px rgba(11, 27, 26, .25),
    inset 0 0 0 1px rgba(255,255,255,.08);
  transition: all .45s cubic-bezier(.2,.8,.2,1);
  cursor: pointer;
  overflow: hidden;
}
.phone-notch {
  position: absolute;
  top: 8px; left: 50%;
  transform: translateX(-50%);
  width: 80px; height: 20px;
  background: #000;
  border-radius: 14px;
  z-index: 2;
}
.phone-img {
  width: 100%; height: 100%;
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(20,184,166,.18), rgba(15,118,110,.08)),
    repeating-linear-gradient(45deg, rgba(20,184,166,.06) 0 10px, transparent 10px 20px);
  border: 1px solid rgba(255,255,255,.05);
}

/* 叠加层级 */
.phone-back {
  top: 10px; left: 0;
  transform: rotate(-10deg) scale(.82);
  opacity: .55;
  z-index: 1;
  animation: float-y 6s ease-in-out infinite;
}
.phone-mid {
  top: 40px; left: 45px;
  transform: rotate(-4deg) scale(.92);
  opacity: .8;
  z-index: 2;
  animation: float-y 6s ease-in-out infinite .6s;
}
.phone-front {
  top: 0; left: 100px;
  transform: rotate(4deg) scale(1);
  opacity: 1;
  z-index: 3;
  animation: float-y 6s ease-in-out infinite 1.2s;
  box-shadow:
    0 25px 60px rgba(11, 27, 26, .35),
    0 0 0 4px rgba(20,184,166,.15),
    inset 0 0 0 1px rgba(255,255,255,.1);
}

/* 鼠标悬停：单独悬停某张图时，该图置顶放大，其余缩小让位 */
.phone-back:hover {
  transform: rotate(0deg) scale(1.08) translate(60px, 20px) !important;
  opacity: 1 !important;
  z-index: 10 !important;
  box-shadow:
    0 35px 80px rgba(11, 27, 26, .45),
    0 0 0 6px rgba(20,184,166,.25),
    var(--shadow-glow) !important;
}
.phone-mid:hover {
  transform: rotate(0deg) scale(1.1) translate(0, 20px) !important;
  opacity: 1 !important;
  z-index: 10 !important;
  box-shadow:
    0 35px 80px rgba(11, 27, 26, .45),
    0 0 0 6px rgba(20,184,166,.25),
    var(--shadow-glow) !important;
}
.phone-front:hover {
  transform: rotate(0deg) scale(1.1) translateX(0) !important;
  opacity: 1 !important;
  z-index: 10 !important;
  box-shadow:
    0 35px 80px rgba(11, 27, 26, .45),
    0 0 0 6px rgba(20,184,166,.25),
    var(--shadow-glow) !important;
}

/* 当鼠标悬停某张图时，另外两张自动缩小让位 */
.screenshot-wrap:has(.phone-back:hover) .phone-mid {
  transform: rotate(-6deg) scale(.82) translate(-20px, 0);
  opacity: .55;
}
.screenshot-wrap:has(.phone-back:hover) .phone-front {
  transform: rotate(8deg) scale(.82) translate(20px, -10px);
  opacity: .55;
}

.screenshot-wrap:has(.phone-mid:hover) .phone-back {
  transform: rotate(-14deg) scale(.75) translate(-30px, 0);
  opacity: .45;
}
.screenshot-wrap:has(.phone-mid:hover) .phone-front {
  transform: rotate(10deg) scale(.82) translate(20px, 0);
  opacity: .55;
}

.screenshot-wrap:has(.phone-front:hover) .phone-back {
  transform: rotate(-14deg) scale(.72) translate(-30px, 10px);
  opacity: .4;
}
.screenshot-wrap:has(.phone-front:hover) .phone-mid {
  transform: rotate(-4deg) scale(.82) translate(-15px, 10px);
  opacity: .55;
}

/* 点击某张图时的激活态（JS 加 class） */
.screenshot-wrap[data-active="0"] .phone-back { transform: rotate(0) scale(1) translate(0, 20px); opacity: 1; z-index: 5; }
.screenshot-wrap[data-active="0"] .phone-mid  { transform: rotate(-6deg) scale(.85) translate(-10px, 0); opacity: .6; z-index: 2; }
.screenshot-wrap[data-active="0"] .phone-front{ transform: rotate(6deg) scale(.85) translate(10px, 0); opacity: .6; z-index: 2; }

.screenshot-wrap[data-active="1"] .phone-back { transform: rotate(-10deg) scale(.85) translate(-20px, 0); opacity: .6; z-index: 2; }
.screenshot-wrap[data-active="1"] .phone-mid  { transform: rotate(0) scale(1) translate(0, 20px); opacity: 1; z-index: 5; }
.screenshot-wrap[data-active="1"] .phone-front{ transform: rotate(10deg) scale(.85) translate(20px, 0); opacity: .6; z-index: 2; }

.screenshot-wrap[data-active="2"] .phone-back { transform: rotate(-14deg) scale(.8) translate(-10px, 0); opacity: .5; z-index: 2; }
.screenshot-wrap[data-active="2"] .phone-mid  { transform: rotate(-6deg) scale(.9) translate(0, 10px); opacity: .7; z-index: 3; }
.screenshot-wrap[data-active="2"] .phone-front{ transform: rotate(0) scale(1.08); opacity: 1; z-index: 6; }

@keyframes float-y {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-14px); }
}

/* 小圆点指示 */
.phone-dots {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}
.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--gray-300);
  cursor: pointer;
  transition: all .25s ease;
}
.dot.active {
  width: 28px;
  border-radius: 999px;
  background: var(--teal-500);
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  left: 50%; bottom: 24px;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid var(--gray-300);
  border-radius: 999px;
  display: block;
}
.scroll-hint span {
  display: block;
  width: 4px; height: 8px;
  background: var(--teal-500);
  border-radius: 2px;
  margin: 8px auto;
  animation: scroll-dot 1.8s ease-in-out infinite;
}
@keyframes scroll-dot {
  0%   { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(14px); }
}

/* ===========================================================
   功能亮点
   =========================================================== */
.features {
  padding: 100px 0;
  background: var(--white);
}

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

.feature-card {
  padding: 32px 28px;
  background: var(--white);
  border: 1px solid rgba(15,118,110,.08);
  border-radius: var(--radius-lg);
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(20,184,166,.06), transparent 60%);
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-mid);
  border-color: rgba(20,184,166,.25);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 6px 16px rgba(20,184,166,.35);
}
.feature-icon svg { width: 26px; height: 26px; }

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--ink-900);
}
.feature-card p {
  font-size: 14.5px;
  color: var(--gray-500);
  line-height: 1.7;
}

.stats-row {
  margin-top: 60px;
  padding: 36px;
  background: linear-gradient(135deg, var(--teal-700), var(--teal-900));
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
  box-shadow: var(--shadow-mid);
}
.stat-num {
  display: block;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  color: var(--white);
  font-family: "SF Mono", Consolas, monospace;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.stat-num .plus { font-size: 20px; }
.stat-label {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,.7);
  font-weight: 500;
}

/* ===========================================================
   用户评价
   =========================================================== */
.reviews {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--teal-50) 0%, var(--white) 100%);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.review-card {
  padding: 32px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15,118,110,.08);
  transition: all .3s ease;
}
.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-mid);
}

.review-stars {
  font-size: 15px;
  color: #F59E0B;
  margin-bottom: 14px;
  letter-spacing: 2px;
}
.review-text {
  font-size: 15px;
  color: var(--ink-800);
  line-height: 1.8;
  margin-bottom: 22px;
  position: relative;
}
.review-text::before {
  content: "\201C";
  position: absolute;
  left: -8px; top: -20px;
  font-size: 60px;
  color: var(--teal-200);
  font-family: Georgia, serif;
  line-height: 1;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}
.avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal-400), var(--teal-700));
  color: var(--white);
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.user-name { font-size: 14.5px; font-weight: 600; color: var(--ink-900); }
.user-date { font-size: 12px; color: var(--gray-400); }

/* ===========================================================
   常见问题 FAQ
   =========================================================== */
.faq {
  padding: 100px 0;
  background: var(--white);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}
.faq-item:first-child { border-top: 1px solid var(--gray-200); }

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
  text-align: left;
  transition: color .2s ease;
}
.faq-question:hover { color: var(--teal-700); }

.faq-icon {
  position: relative;
  width: 22px; height: 22px;
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--teal-500);
  border-radius: 2px;
  transition: all .3s ease;
}
.faq-icon::before {
  top: 50%; left: 0;
  width: 22px; height: 2px;
  transform: translateY(-50%);
}
.faq-icon::after {
  top: 0; left: 50%;
  width: 2px; height: 22px;
  transform: translateX(-50%);
}
.faq-item.active .faq-icon::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .3s ease;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 22px;
}
.faq-answer p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.8;
  padding-right: 32px;
}

/* ===========================================================
   下载区域
   =========================================================== */
.download {
  padding: 100px 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 100%, rgba(20,184,166,.12), transparent 70%),
    linear-gradient(180deg, var(--teal-50) 0%, var(--white) 100%);
}

.download-card {
  position: relative;
  max-width: 780px;
  margin: 0 auto;
  padding: 64px 48px;
  background: linear-gradient(135deg, var(--teal-700) 0%, var(--teal-900) 100%);
  border-radius: var(--radius-xl);
  text-align: center;
  color: var(--white);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.download-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(94,234,212,.25), transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(20,184,166,.35), transparent 45%);
  pointer-events: none;
}
.download-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, #000 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, #000 40%, transparent 85%);
  pointer-events: none;
}
.download-card > * { position: relative; z-index: 1; }

.download-logo {
  width: 72px; height: 72px;
  border-radius: 18px;
  background: rgba(255,255,255,.15);
  border: 2px solid rgba(255,255,255,.3);
  margin: 0 auto 24px;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.download-title {
  font-size: clamp(24px, 3.2vw, 34px);
  margin-bottom: 12px;
}
.download-desc {
  font-size: 15px;
  color: rgba(255,255,255,.8);
  margin-bottom: 32px;
  line-height: 1.8;
}

.download-meta {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.meta-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  font-size: 13px;
  backdrop-filter: blur(4px);
}
.meta-chip span { color: rgba(255,255,255,.7); }
.meta-chip strong { font-weight: 700; color: var(--white); font-family: "SF Mono", Consolas, monospace; }

.download-btn {
  background: var(--white);
  color: var(--teal-800);
  font-size: 17px;
  font-weight: 700;
  padding: 18px 44px;
  box-shadow: 0 10px 40px rgba(0,0,0,.25), 0 0 0 4px rgba(255,255,255,.12);
}
.download-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 18px 50px rgba(0,0,0,.3), 0 0 0 6px rgba(255,255,255,.18);
}
.download-tip {
  margin-top: 16px;
  font-size: 13px;
  color: rgba(255,255,255,.6);
}

/* ===========================================================
   页脚
   =========================================================== */
.footer {
  background: var(--ink-900);
  color: rgba(255,255,255,.7);
  padding: 48px 0 28px;
}
.footer-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer-logo {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--teal-400), var(--teal-700));
  border: 2px solid rgba(20,184,166,.4);
}
.footer-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}
.footer-sub {
  font-size: 13px;
  color: rgba(255,255,255,.5);
}
.footer-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,.65);
  transition: color .2s ease;
}
.footer-links a:hover { color: var(--teal-300); }
.footer-copy {
  font-size: 12px;
  color: rgba(255,255,255,.4);
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 20px;
  text-align: center;
}

/* ===========================================================
   回顶按钮
   =========================================================== */
.back-top {
  position: fixed;
  right: 24px; bottom: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 22px rgba(20,184,166,.45);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all .3s ease;
  z-index: 90;
}
.back-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(20,184,166,.55);
}

/* ===========================================================
   动画入场（JS 加 reveal class）
   =========================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; gap: 50px; text-align: center; }
  .hero-left { order: 2; }
  .hero-right { order: 1; }
  .hero-meta { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .screenshot-wrap { width: 280px; height: 560px; }
  .phone { width: 200px; height: 420px; }
  .phone-front { left: 85px; }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--gray-200);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: all .25s ease;
  }
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link { width: 100%; text-align: center; padding: 12px; border-radius: 12px; }
  .nav-toggle { display: flex; }

  .hero { padding: 110px 0 80px; }
  .hero-title { font-size: 32px; }
  .hero-meta { padding: 12px 18px; gap: 14px; }

  .screenshot-wrap { width: 240px; height: 500px; }
  .phone { width: 170px; height: 360px; border-radius: 30px; padding: 8px; }
  .phone-notch { width: 60px; height: 16px; border-radius: 10px; }
  .phone-img { border-radius: 22px; }
  .phone-back { transform: rotate(-10deg) scale(.8); }
  .phone-mid  { transform: rotate(-4deg) scale(.9); top: 30px; left: 30px; }
  .phone-front{ transform: rotate(4deg) scale(1); left: 70px; }

  .features, .reviews, .faq, .download { padding: 70px 0; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-grid  { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); padding: 28px; gap: 16px; }
  .section-head { margin-bottom: 40px; }

  .download-card { padding: 48px 28px; }
  .download-logo { width: 60px; height: 60px; border-radius: 14px; }

  .scroll-hint { display: none; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; width: 100%; }
  .btn { width: 100%; }
  .phone-back { transform: rotate(-14deg) scale(.72); }
  .phone-mid  { transform: rotate(-4deg) scale(.84); left: 20px; }
  .phone-front{ transform: rotate(4deg) scale(.94); left: 58px; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .footer-links { flex-direction: column; gap: 10px; }
}