/* =========================================
   青丘语AI 官网样式
   配色基于紫色渐变Logo风格
   ========================================= */

/* 变量定义 */
:root {
  --purple-50:  #F5F3FF;
  --purple-100: #EDE9FE;
  --purple-200: #DDD6FE;
  --purple-300: #C4B5FD;
  --purple-400: #A78BFA;
  --purple-500: #8B5CF6;
  --purple-600: #7C3AED;
  --purple-700: #6D28D9;
  --purple-800: #5B21B6;
  --purple-900: #4C1D95;

  --accent-pink:  #EC4899;
  --accent-blue:  #3B82F6;
  --accent-green: #10B981;
  --accent-orange: #F59E0B;
  --accent-teal:  #14B8A6;
  --accent-violet:#8B5CF6;
  --accent-rose:  #F43F5E;

  --text-900: #1F2937;
  --text-700: #374151;
  --text-500: #6B7280;
  --text-400: #9CA3AF;
  --text-white: #FFFFFF;

  --bg-page: #FAF8FF;
  --bg-card: #FFFFFF;
  --border: #E5E7EB;

  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;

  --shadow-sm: 0 2px 8px rgba(124, 58, 237, 0.08);
  --shadow-md: 0 8px 24px rgba(124, 58, 237, 0.12);
  --shadow-lg: 0 20px 50px rgba(124, 58, 237, 0.18);
  --shadow-xl: 0 30px 80px rgba(76, 29, 149, 0.25);

  --gradient-main: linear-gradient(135deg, #A78BFA 0%, #7C3AED 50%, #6D28D9 100%);
  --gradient-soft: linear-gradient(135deg, #EDE9FE 0%, #DDD6FE 100%);
  --gradient-text: linear-gradient(135deg, #A78BFA 0%, #7C3AED 100%);
  --gradient-hero: radial-gradient(ellipse at top left, rgba(167,139,250,0.35) 0%, transparent 55%),
                   radial-gradient(ellipse at bottom right, rgba(124,58,237,0.30) 0%, transparent 55%),
                   linear-gradient(180deg, #F5F0FF 0%, #FAF8FF 100%);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-700);
  background: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
svg { display: inline-block; vertical-align: middle; }

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(255, 255, 255, 0.75);
  border-bottom: 1px solid rgba(124, 58, 237, 0.08);
  transition: all 0.3s ease;
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 14px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
}
.logo-img {
  width: 42px; height: 42px;
  border-radius: 12px;
  background: var(--gradient-main);
  object-fit: contain;
}
.logo-text {
  font-size: 20px; font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links {
  display: flex; align-items: center; gap: 32px;
}
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--text-700);
  transition: color 0.2s;
  position: relative;
}
.nav-links a:not(.nav-download)::after {
  content: ""; position: absolute; left: 0; bottom: -4px;
  width: 0; height: 2px; background: var(--gradient-main);
  transition: width 0.25s ease;
}
.nav-links a:hover { color: var(--purple-600); }
.nav-links a:hover::after { width: 100%; }
.nav-download {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 9px 20px;
  border-radius: 10px;
  font-weight: 600 !important;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
  transition: transform 0.2s, box-shadow 0.2s !important;
}
.nav-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(124, 58, 237, 0.45) !important;
  color: #fff !important;
}
.menu-toggle {
  display: none;
  flex-direction: column; gap: 5px;
  padding: 6px;
}
.menu-toggle span {
  display: block; width: 24px; height: 2.5px;
  background: var(--purple-700); border-radius: 2px;
  transition: all 0.3s;
}
.menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

/* ========== 首屏 Hero ========== */
.hero {
  position: relative;
  padding: 140px 32px 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: var(--gradient-hero);
  z-index: -2;
}
.hero-bg::before,
.hero-bg::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
}
.hero-bg::before {
  width: 500px; height: 500px;
  top: -150px; left: -100px;
  background: radial-gradient(circle, #C4B5FD, transparent 70%);
  animation: float 8s ease-in-out infinite;
}
.hero-bg::after {
  width: 600px; height: 600px;
  bottom: -200px; right: -150px;
  background: radial-gradient(circle, #DDD6FE, transparent 70%);
  animation: float 10s ease-in-out infinite reverse;
}
@keyframes float {
  0%,100% { transform: translate(0,0); }
  50%     { transform: translate(30px,-30px); }
}
.hero-inner {
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 64px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--purple-200);
  font-size: 13px; font-weight: 500; color: var(--purple-700);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}
.hero-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 0 4px rgba(16,185,129,0.15);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { box-shadow: 0 0 0 4px rgba(16,185,129,0.15); }
  50%     { box-shadow: 0 0 0 8px rgba(16,185,129,0); }
}
.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800; line-height: 1.15;
  color: var(--text-900);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero-desc {
  font-size: 17px; line-height: 1.8;
  color: var(--text-500);
  margin-bottom: 28px;
  max-width: 560px;
}
.version-row {
  display: inline-flex; align-items: center; gap: 18px;
  padding: 14px 22px; margin-bottom: 28px;
  background: #fff; border: 1px solid var(--purple-100);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.version-item {
  display: flex; flex-direction: column;
}
.v-label {
  font-size: 12px; color: var(--text-400); margin-bottom: 2px;
}
.v-value {
  font-size: 16px; font-weight: 700; color: var(--purple-700);
}
.divider {
  width: 1px; height: 32px; background: var(--purple-100);
}
.hero-cta {
  display: flex; gap: 14px; margin-bottom: 36px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 30px; border-radius: 14px;
  font-size: 16px; font-weight: 600;
  transition: all 0.25s ease;
}
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 10px 30px rgba(124, 58, 237, 0.4);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(124, 58, 237, 0.5);
}
.btn-ghost {
  background: #fff; color: var(--purple-700);
  border: 1.5px solid var(--purple-200);
}
.btn-ghost:hover {
  background: var(--purple-50);
  border-color: var(--purple-400);
  transform: translateY(-3px);
}
.hero-stats {
  display: flex; gap: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(124, 58, 237, 0.1);
}
.hero-stats .stat {
  display: flex; flex-direction: column;
}
.hero-stats strong {
  font-size: 26px; font-weight: 800; line-height: 1;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stats span {
  font-size: 13px; color: var(--text-500); margin-top: 6px;
}

/* ---------- 截图展示区 ---------- */
.hero-screenshots {
  display: flex; justify-content: center;
}
.screens-wrapper {
  position: relative;
  width: 100%;
  max-width: 320px;
}
.screen-main {
  position: relative;
  aspect-ratio: 9 / 17;
  border-radius: 30px;
  background: #fff;
  border: 6px solid #fff;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transition: transform 0.4s ease;
}
.screen-main:hover {
  transform: translateY(-6px) rotate(-1deg);
}
/* 三张独立大图：叠层切换 */
.screen-slide {
  position: absolute; inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.45s ease, transform 0.45s ease;
  transform: scale(1.04);
}
.screen-slide.active {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
  z-index: 2;
}
.screen-slide img {
  width: 100%; height: 100%;
  object-fit: cover;
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.screen-slide img[src]:not([src=""]) {
  opacity: 1;
}
.screen-placeholder {
  position: absolute; inset: 0;
  background: linear-gradient(160deg, #F5F0FF 0%, #EDE9FE 40%, #DDD6FE 100%);
  display: flex; align-items: center; justify-content: center;
}
.screen-slide img[src]:not([src=""]) ~ .screen-placeholder {
  display: none;
}
.ph-content {
  text-align: center;
  padding: 24px;
}
.ph-content::before {
  content: "";
  display: block;
  width: 72px; height: 72px;
  margin: 0 auto 20px;
  border-radius: 22px;
  background: var(--gradient-main);
  box-shadow: 0 10px 26px rgba(124, 58, 237, 0.32);
  position: relative;
}
.ph-content::after {
  content: "Q";
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -80%);
  font-size: 42px;
  font-weight: 800;
  color: #fff;
}
.ph-title {
  font-size: 18px; font-weight: 700;
  color: var(--purple-800);
  margin-bottom: 6px;
}
.ph-desc {
  font-size: 13px; color: var(--purple-500);
}
.screen-thumbs {
  display: flex; gap: 12px;
  margin-top: 20px;
  justify-content: center;
}
.thumb {
  position: relative;
  width: 78px; height: 136px;
  border-radius: 18px;
  background: #fff;
  border: 3px solid #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.3s ease;
}
.thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
}
.thumb img[src]:not([src=""]) { opacity: 1; }
.thumb-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(160deg, #EDE9FE 0%, #C4B5FD 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 800; color: var(--purple-700);
  transition: all 0.3s ease;
}
.thumb img[src]:not([src=""]) ~ .thumb-overlay {
  opacity: 0;
  transform: scale(1.1);
}
.thumb:hover,
.thumb.active {
  transform: translateY(-8px) scale(1.04);
  box-shadow: var(--shadow-lg);
  border-color: var(--purple-400);
}
.thumb:hover .thumb-overlay,
.thumb.active .thumb-overlay {
  background: var(--gradient-main);
  color: #fff;
}

.hero-wave {
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  line-height: 0;
}
.hero-wave svg {
  width: 100%; height: 90px;
  fill: var(--bg-page);
}

/* ========== 通用 Section ========== */
.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 100px 32px;
}
.section-head {
  text-align: center;
  margin-bottom: 64px;
}
.eyebrow {
  display: inline-block;
  padding: 6px 16px;
  font-size: 13px; font-weight: 600;
  color: var(--purple-600);
  background: var(--purple-100);
  border-radius: 999px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.section-head h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 800;
  color: var(--text-900);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.section-head p {
  font-size: 17px; color: var(--text-500);
  max-width: 640px; margin: 0 auto;
}

/* ========== 功能特色 ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--purple-100);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--purple-200);
}
.feature-card:hover::before { transform: scaleX(1); }
.f-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  margin-bottom: 20px;
}
.f-icon svg { width: 28px; height: 28px; }
.f-icon.purple { background: linear-gradient(135deg, #A78BFA, #7C3AED); }
.f-icon.pink   { background: linear-gradient(135deg, #F472B6, #EC4899); }
.f-icon.blue   { background: linear-gradient(135deg, #60A5FA, #3B82F6); }
.f-icon.green  { background: linear-gradient(135deg, #34D399, #10B981); }
.f-icon.orange { background: linear-gradient(135deg, #FBBF24, #F59E0B); }
.f-icon.teal   { background: linear-gradient(135deg, #2DD4BF, #14B8A6); }
.f-icon.violet { background: linear-gradient(135deg, #C084FC, #8B5CF6); }
.f-icon.rose   { background: linear-gradient(135deg, #FB7185, #F43F5E); }
.feature-card h3 {
  font-size: 18px; font-weight: 700;
  color: var(--text-900);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 14.5px; line-height: 1.7;
  color: var(--text-500);
}

/* ========== 产品展示 Steps ========== */
.showcase-steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 16px;
  padding: 0 8px;
}
.step {
  background: #fff;
  border: 1px solid var(--purple-100);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: all 0.3s ease;
}
.step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--purple-300);
}
.step-num {
  width: 52px; height: 52px;
  border-radius: 16px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 20px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
}
.step-content h3 {
  font-size: 18px; font-weight: 700;
  color: var(--text-900); margin-bottom: 8px;
}
.step-content p {
  font-size: 14.5px; line-height: 1.7;
  color: var(--text-500);
}
.step-line {
  width: 32px;
  height: 2px;
  margin-top: 54px;
  background: repeating-linear-gradient(90deg, var(--purple-300) 0 6px, transparent 6px 10px);
  align-self: start;
}

/* ========== 用户评价 ========== */
.reviews {
  background: linear-gradient(180deg, transparent 0%, rgba(237,233,254,0.35) 50%, transparent 100%);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--purple-100);
  transition: all 0.3s ease;
  position: relative;
}
.review-card::after {
  content: """;
  position: absolute;
  top: 18px; right: 24px;
  font-size: 64px; font-family: Georgia, serif;
  color: var(--purple-200);
  line-height: 1;
}
.review-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.review-stars {
  color: #F59E0B;
  font-size: 16px;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.review-text {
  font-size: 15px; line-height: 1.8;
  color: var(--text-700);
  margin-bottom: 22px;
  padding-right: 20px;
}
.review-user {
  display: flex; align-items: center; gap: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--purple-100);
}
.avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: var(--gradient-main);
  color: #fff;
  font-weight: 700; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.review-user .name {
  font-size: 14px; font-weight: 600; color: var(--text-900);
}
.review-user .date {
  font-size: 12px; color: var(--text-400); margin-top: 2px;
}

/* ========== FAQ ========== */
.faq-list {
  max-width: 840px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 14px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--purple-100);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
}
.faq-item:hover { border-color: var(--purple-200); }
.faq-item.open {
  box-shadow: var(--shadow-md);
  border-color: var(--purple-300);
}
.faq-q {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px;
  font-size: 16px; font-weight: 600;
  color: var(--text-900);
  text-align: left;
  gap: 16px;
}
.faq-arrow {
  width: 20px; height: 20px; flex-shrink: 0;
  color: var(--purple-500);
  transition: transform 0.3s ease;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
}
.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 24px 24px;
}
.faq-a p {
  font-size: 15px; line-height: 1.8;
  color: var(--text-500);
}

/* ========== 下载区域 ========== */
.download-card {
  max-width: 1200px; margin: 0 auto;
  background: var(--gradient-main);
  border-radius: 32px;
  padding: 64px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.download-card::before,
.download-card::after {
  content: ""; position: absolute; border-radius: 50%;
  filter: blur(60px); opacity: 0.35;
}
.download-card::before {
  width: 300px; height: 300px;
  top: -80px; right: -60px;
  background: #F472B6;
}
.download-card::after {
  width: 280px; height: 280px;
  bottom: -80px; left: -40px;
  background: #60A5FA;
}
.download-left, .download-right { position: relative; z-index: 1; }
.dl-logo-wrap {
  width: 84px; height: 84px;
  border-radius: 26px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  padding: 12px;
  margin-bottom: 26px;
  border: 1px solid rgba(255,255,255,0.25);
}
.dl-logo {
  width: 100%; height: 100%;
  border-radius: 16px;
  background: rgba(255,255,255,0.2);
  object-fit: contain;
}
.download-left h2 {
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 16px;
}
.download-left .gradient-text {
  background: linear-gradient(135deg, #FDE68A, #FCA5A5, #F9A8D4);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.download-left p {
  color: rgba(255,255,255,0.85);
  font-size: 15.5px; line-height: 1.75;
  margin-bottom: 22px;
}
.dl-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 14px;
  margin-bottom: 24px;
}
.dl-features li {
  color: #fff; font-size: 14px;
  display: flex; align-items: center; gap: 8px;
}
.dl-meta {
  display: flex; flex-wrap: wrap; gap: 16px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9); font-size: 14px;
}
.dl-meta strong { color: #fff; font-weight: 600; }

.download-right {
  display: flex; flex-direction: column; align-items: stretch;
}
.dl-btn {
  display: flex; align-items: center; gap: 20px;
  padding: 28px 32px;
  background: #fff;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
  position: relative;
}
.dl-btn:hover {
  transform: translateY(-5px) scale(1.01);
  box-shadow: 0 28px 80px rgba(0,0,0,0.28);
}
.dl-icon {
  width: 72px; height: 72px;
  border-radius: 22px;
  background: var(--gradient-main);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 10px 28px rgba(124, 58, 237, 0.35);
}
.dl-text { flex: 1; }
.dl-title {
  font-size: 20px; font-weight: 800;
  color: var(--text-900);
}
.dl-subtitle {
  font-size: 13.5px; color: var(--text-500);
  margin-top: 4px;
}
.dl-arrow {
  color: var(--purple-600);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.dl-btn:hover .dl-arrow { transform: translateX(6px); }

.dl-tips {
  margin-top: 22px;
  display: flex; flex-direction: column; gap: 10px;
}
.tip {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  color: rgba(255,255,255,0.9);
  font-size: 13.5px;
  backdrop-filter: blur(6px);
}
.tip svg { flex-shrink: 0; }

/* ========== 页脚 ========== */
.footer {
  background: linear-gradient(180deg, var(--bg-page) 0%, #EDE9FE 100%);
  padding: 60px 32px 32px;
  border-top: 1px solid var(--purple-100);
}
.footer-inner {
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 2fr;
  gap: 48px;
}
.foot-brand p {
  font-size: 15px; color: var(--text-500);
  margin-top: 14px;
}
.foot-logo {
  width: 52px; height: 52px;
  border-radius: 16px;
  background: var(--gradient-main);
  padding: 8px;
}
.foot-logo-img {
  width: 100%; height: 100%;
  object-fit: contain;
}
.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.foot-cols h4 {
  font-size: 15px; font-weight: 700;
  color: var(--text-900);
  margin-bottom: 14px;
}
.foot-cols a, .foot-cols span {
  display: block;
  font-size: 14px; color: var(--text-500);
  padding: 4px 0;
  transition: color 0.2s;
}
.foot-cols a:hover { color: var(--purple-600); }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-text { text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-cta, .hero-stats, .version-row { justify-content: center; }
  .version-row { margin-left: auto; margin-right: auto; }
  .hero-stats { justify-content: center; text-align: center; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-steps {
    grid-template-columns: 1fr;
  }
  .step-line { display: none; }
  .download-card {
    grid-template-columns: 1fr;
    padding: 48px 36px;
    gap: 36px;
  }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-inner { padding: 12px 20px; }
  .nav-links {
    position: fixed;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--purple-100);
    transform: translateY(-130%);
    transition: transform 0.35s ease;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: translateY(0); }
  .menu-toggle { display: flex; }
  .hero { padding: 110px 20px 60px; }
  .section { padding: 72px 20px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stats strong { font-size: 22px; }
  .screens-wrapper { max-width: 260px; }
  .screen-main { aspect-ratio: 9 / 18; border-width: 6px; border-radius: 26px; }
  .thumb { width: 66px; height: 118px; border-radius: 14px; border-width: 3px; }
  .screen-thumbs { margin-top: 16px; gap: 10px; }
  .ph-content::before { width: 62px; height: 62px; border-radius: 20px; }
  .ph-content::after { font-size: 36px; }
  .ph-title { font-size: 16px; }
  .thumb-overlay { font-size: 18px; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .download-card {
    border-radius: 24px;
    padding: 36px 24px;
  }
  .dl-features { grid-template-columns: 1fr; }
  .dl-btn {
    padding: 22px 20px;
    gap: 14px;
  }
  .dl-icon { width: 56px; height: 56px; border-radius: 16px; }
  .dl-icon svg { width: 28px; height: 28px; }
  .dl-title { font-size: 17px; }
  .dl-subtitle { font-size: 12px; }
  .foot-cols { grid-template-columns: 1fr 1fr; }
  .faq-q { font-size: 15px; padding: 16px 18px; }
  .faq-item.open .faq-a { padding: 0 18px 20px; }
  .footer { padding: 40px 20px 24px; }
  .hero-wave svg { height: 50px; }
  .section-head h2 { font-size: 28px; }
}

@media (max-width: 420px) {
  .logo-text { display: none; }
  .hero-title { font-size: 30px; }
  .hero-desc { font-size: 15px; }
  .version-row { flex-direction: row; gap: 10px; padding: 12px 16px; }
  .v-value { font-size: 14px; }
  .divider { height: 24px; }
  .dl-meta { flex-direction: column; gap: 6px; }
}