/* ================================
   鲲鲲的AI软件站 · 现代全屏风格
   ================================ */

/* ----- 基础重置 ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
               Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ----- 颜色 / 变量 ----- */
:root {
  --primary: #DC2626;          /* 主色：朱红（取自 logo） */
  --primary-deep: #B91C1C;
  --primary-soft: #FEE2E2;
  --accent: #F59E0B;            /* 暖橙 */
  --accent-deep: #D97706;
  --gradient: linear-gradient(135deg, #DC2626 0%, #F59E0B 100%);
  --gradient-soft: linear-gradient(135deg, #FEF2F2 0%, #FFFBEB 100%);

  --ink: #0F172A;
  --ink-2: #1E293B;
  --ink-3: #334155;
  --muted: #64748B;
  --muted-2: #94A3B8;
  --line: #E2E8F0;
  --line-2: #F1F5F9;

  --bg: #FFFFFF;
  --bg-soft: #FAFAFA;
  --bg-card: #FFFFFF;

  --shadow-sm: 0 1px 2px rgba(15,23,42,.04);
  --shadow: 0 10px 30px rgba(15,23,42,.06);
  --shadow-lg: 0 30px 60px -10px rgba(15,23,42,.18);
  --shadow-color: 0 20px 40px rgba(220,38,38,.25);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --container: 1200px;
  --pad: 24px;
  --topbar-h: 72px;
}

/* ----- 通用 ----- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad);
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--ink);
  margin-bottom: 12px;
}
.section-sub {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: .2em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .02em;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: var(--shadow-color);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 50px -10px rgba(220,38,38,.35);
}
.btn-ghost {
  background: rgba(255,255,255,.6);
  color: var(--ink);
  border: 1.5px solid var(--line);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: #fff;
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--gradient);
  color: #fff;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  box-shadow: var(--shadow-color);
  transition: transform .2s ease, box-shadow .2s ease;
}
.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 50px -10px rgba(220,38,38,.4);
}
.btn-download::before {
  content: "⬇";
  font-size: 16px;
}

/* ===== 顶部导航 ===== */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--topbar-h);
  background: rgba(255,255,255,.7);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.topbar.scrolled {
  background: rgba(255,255,255,.92);
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(15,23,42,.04), 0 8px 24px -16px rgba(15,23,42,.2);
}
.topbar-inner {
  max-width: var(--container);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  filter: drop-shadow(0 2px 6px rgba(220,38,38,.25));
  transition: transform .4s ease;
}
.brand:hover .brand-logo { transform: rotate(-8deg) scale(1.05); }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-title {
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: .02em;
}
.brand-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .25em;
  margin-top: 3px;
  text-transform: uppercase;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-item { position: relative; }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  border-radius: 10px;
  transition: color .2s ease, background .2s ease;
  cursor: pointer;
}
.nav-link:hover {
  color: var(--primary);
  background: var(--primary-soft);
}
.caret {
  font-size: 10px;
  color: var(--muted-2);
  transition: transform .2s ease;
}
.nav-item.has-dropdown.open .caret { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 240px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.nav-item.has-dropdown.open .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--ink-2);
  border-radius: 8px;
  transition: background .15s ease, color .15s ease;
}
.dropdown a:hover {
  background: var(--primary-soft);
  color: var(--primary);
}
.dropdown-empty {
  padding: 12px 14px;
  font-size: 13px;
  color: var(--muted-2);
  font-style: italic;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink-2);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s 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); }

/* ===== Hero 全屏首屏 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--topbar-h) + 40px) 24px 80px;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 80% -10%, #FEE2E2 0%, transparent 60%),
    radial-gradient(900px 500px at 0% 100%, #FEF3C7 0%, transparent 55%),
    linear-gradient(180deg, #FFFFFF 0%, #FAFAFA 100%);
}
.hero-bg {
  position: absolute; inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: .55;
  animation: float 12s ease-in-out infinite;
}
.orb-1 { width: 380px; height: 380px; background: #FCA5A5; top: 8%; left: -80px; }
.orb-2 { width: 320px; height: 320px; background: #FCD34D; bottom: 10%; right: -60px; animation-delay: -4s; }
.orb-3 { width: 260px; height: 260px; background: #FECACA; top: 50%; left: 60%; animation-delay: -8s; }
@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(30px, -40px); }
}
.hero-inner {
  position: relative;
  text-align: center;
  max-width: 900px;
  z-index: 1;
}
.hero-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto 24px;
  filter: drop-shadow(0 20px 40px rgba(220,38,38,.25));
  animation: heroFloat 6s ease-in-out infinite;
}
.hero-logo img { width: 100%; height: 100%; object-fit: contain; }
@keyframes heroFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}
.hero-title {
  font-size: clamp(40px, 7vw, 84px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--ink);
  margin-bottom: 18px;
}
.hero-title .hl {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}
.hero-tagline {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--ink-3);
  margin-bottom: 28px;
  font-weight: 400;
}
.hero-slogan {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 14px 28px;
  background: rgba(255,255,255,.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-bottom: 40px;
  font-weight: 600;
  letter-spacing: .15em;
  color: var(--ink-2);
  font-size: 14px;
}
.slogan-word { color: var(--primary); }
.slogan-dot { color: var(--muted-2); }
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid var(--muted-2);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.hero-scroll span {
  display: block;
  width: 3px;
  height: 8px;
  background: var(--muted-2);
  border-radius: 2px;
  animation: scrollDown 1.6s ease-in-out infinite;
}
@keyframes scrollDown {
  0%   { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}

/* ===== 价值观 ===== */
.values {
  padding: 100px 0 80px;
  background: #fff;
  position: relative;
}
.values-title-wrap {
  text-align: center;
  margin-bottom: 60px;
}
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.value-card {
  text-align: center;
  padding: 40px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-soft);
}
.value-icon {
  font-size: 44px;
  margin-bottom: 16px;
  display: inline-block;
  filter: grayscale(.1);
  transition: transform .4s ease;
}
.value-card:hover .value-icon {
  transform: scale(1.15) rotate(-5deg);
}
.value-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary);
  letter-spacing: .08em;
}
.value-card p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

/* ===== 产品分类区 ===== */
.products {
  padding: 60px 0 80px;
  background: var(--bg-soft);
}
.cat-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--line-2);
}
.cat-section:last-child { border-bottom: none; }

.cat-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.cat-title-block {
  display: flex;
  align-items: center;
  gap: 16px;
}
.cat-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: #fff;
  box-shadow: var(--shadow-color);
  flex-shrink: 0;
}
.cat-title {
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -.01em;
  line-height: 1.2;
}
.cat-desc {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}
.cat-count {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}

/* 产品详情卡（大卡，每个产品一张） */
.product-card {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
  transition: transform .3s ease, box-shadow .3s ease;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.product-gallery {
  position: relative;
  background: linear-gradient(135deg, #FEF2F2 0%, #FFFBEB 100%);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  min-height: 420px;
}
.gallery-main {
  flex: 1;
  width: 100%;
  max-width: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: #fff;
  position: relative;
  min-height: 280px;
}
.gallery-main img {
  max-width: 100%;
  max-height: 360px;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  transition: opacity .15s ease;
}
.gallery-thumbs {
  display: flex;
  gap: 8px;
  background: rgba(255,255,255,.92);
  padding: 6px;
  border-radius: 12px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}
.gallery-thumbs button {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1.5px solid transparent;
  background: var(--line-2);
  padding: 4px;
  overflow: hidden;
  transition: border-color .2s ease, transform .2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.gallery-thumbs button img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.gallery-thumbs button:hover { transform: translateY(-2px); }
.gallery-thumbs button.active {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.product-info {
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.product-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.badge.badge-accent { background: #FEF3C7; color: var(--accent-deep); }
.badge.badge-line   { background: var(--line-2); color: var(--ink-3); }
.badge.badge-free   { background: #DCFCE7; color: #166534; }
.product-name {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -.01em;
  margin-bottom: 8px;
}
.product-tagline {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 22px;
  line-height: 1.6;
}
.product-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 16px;
  margin-bottom: 24px;
}
.product-features li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--ink-3);
  line-height: 1.5;
}
.product-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 16px;
  height: 16px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
}
.product-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-bottom: 28px;
  padding: 16px 0;
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
  font-size: 13px;
  color: var(--muted);
}
.product-meta span b {
  color: var(--ink-2);
  font-weight: 600;
  margin-left: 4px;
}
.product-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.product-actions .btn-download {
  flex: 0 0 auto;
}
.product-actions .btn-link {
  color: var(--muted);
  font-size: 14px;
  padding: 12px 16px;
  border-radius: 12px;
  transition: color .2s, background .2s;
}
.product-actions .btn-link:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

/* 分类为空 */
.cat-empty {
  text-align: center;
  padding: 60px 20px;
  background: #fff;
  border: 2px dashed var(--line);
  border-radius: var(--radius-lg);
  color: var(--muted);
}
.cat-empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: .5;
}
.cat-empty h4 {
  color: var(--ink-3);
  font-size: 18px;
  margin-bottom: 4px;
  font-weight: 600;
}

/* ===== 关于我们 ===== */
.about {
  padding: 100px 0;
  background: #fff;
}
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-logo {
  width: 80px;
  height: 80px;
  margin-bottom: 16px;
  filter: drop-shadow(0 8px 16px rgba(220,38,38,.2));
}
.about-logo img { width: 100%; height: 100%; object-fit: contain; }
.about-lead {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink-2);
  margin: 16px 0;
  line-height: 1.6;
}
.about-text {
  color: var(--ink-3);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 28px;
}
.about-text b {
  color: var(--primary);
  font-weight: 700;
}
.about-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.about-meta li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}
.about-meta li span {
  flex: 0 0 80px;
  color: var(--muted);
}
.about-meta li b {
  color: var(--ink-2);
  font-weight: 600;
}

.about-card-stack {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.about-stat {
  padding: 32px 24px;
  background: var(--gradient-soft);
  border: 1px solid var(--primary-soft);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: transform .3s ease;
}
.about-stat:hover { transform: translateY(-4px); }
.stat-num {
  font-size: 48px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
  background: linear-gradient(180deg, #0F172A 0%, #020617 100%);
  color: #94A3B8;
  padding: 60px 0 24px;
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--gradient);
  opacity: .6;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(148,163,184,.15);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer-logo {
  width: 52px;
  height: 52px;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(220,38,38,.4));
}
.footer-title {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
}
.footer-sub {
  font-size: 12px;
  color: #64748B;
  letter-spacing: .15em;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.footer-col h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: .05em;
}
.footer-col a, .footer-col p {
  display: block;
  font-size: 13px;
  color: #94A3B8;
  line-height: 1.8;
  transition: color .2s ease;
}
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-size: 12px;
  color: #64748B;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  box-shadow: var(--shadow-color);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all .3s ease;
  z-index: 90;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover { transform: translateY(-4px); }

/* ===== 滚动显示动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s ease, transform .8s ease;
  transition-delay: var(--delay, 0ms);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .nav-list { display: none; }
  .nav-toggle { display: flex; }
  .nav.open .nav-list {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border-top: 1px solid var(--line);
    box-shadow: var(--shadow);
    gap: 2px;
  }
  .nav.open .nav-link { padding: 14px; }
  .dropdown {
    position: static;
    box-shadow: none;
    border: none;
    background: var(--line-2);
    border-radius: 8px;
    margin-top: 4px;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }
  .nav-item.has-dropdown.open .dropdown { display: block; }

  .values-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-card { grid-template-columns: 1fr; }
  .product-info { padding: 32px 28px; }
  .product-features { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .footer-links { grid-template-columns: 1fr 1fr; gap: 24px; }
}
@media (max-width: 560px) {
  .brand-sub { display: none; }
  .hero-cta { flex-direction: column; width: 100%; max-width: 280px; margin: 0 auto; }
  .btn { width: 100%; }
  .about-card-stack { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-num { font-size: 36px; }
  .footer-links { grid-template-columns: 1fr; }
  .cat-header { flex-direction: column; align-items: flex-start; }
}