/* ===========================================================
   小象学长 · Aprostek 官网样式
   品牌色沿用 App：主蓝 #4A6FA5 / 朱红 #C0392B / 青 #2E86AB
   =========================================================== */

:root {
  --primary: #4A6FA5;
  --primary-light: #7B9CC7;
  --primary-dark: #35507A;
  --secondary: #C0392B;
  --secondary-light: #E07065;
  --accent: #2E86AB;
  --accent-light: #68B8D7;
  --warning: #D4A843;
  --ink: #223247;
  --ink-2: #5A6B7E;
  --bg: #F6F8FC;
  --bg-soft: #EEF2F9;
  --card: #FFFFFF;
  --border: #E1E7F0;
  --shadow-sm: 0 2px 12px rgba(34, 50, 71, 0.06);
  --shadow-md: 0 12px 36px rgba(34, 50, 71, 0.10);
  --shadow-lg: 0 24px 70px rgba(34, 50, 71, 0.16);
  --radius: 20px;
  --radius-lg: 28px;
  --maxw: 1180px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

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

/* ---------- 通用文字 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 700; letter-spacing: 0.08em;
  color: var(--accent); text-transform: uppercase;
  padding: 7px 16px; border-radius: 999px;
  background: rgba(46, 134, 171, 0.10);
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800; line-height: 1.25; color: var(--ink);
  letter-spacing: -0.01em;
}
.section-title .hl { color: var(--secondary); }
.section-title .hl-blue { color: var(--primary); }
.section-sub {
  font-size: clamp(16px, 2vw, 19px); color: var(--ink-2);
  max-width: 660px; margin-top: 18px;
}
.section-head { text-align: center; margin: 0 auto 56px; }
.section-head .section-sub { margin-left: auto; margin-right: auto; }

section { padding: clamp(72px, 10vw, 120px) 0; position: relative; }
.section-soft { background: var(--bg-soft); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--font); font-size: 16px; font-weight: 700;
  padding: 15px 30px; border-radius: 999px; border: none; cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s;
  white-space: nowrap;
}
.btn svg { width: 20px; height: 20px; }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  box-shadow: 0 12px 30px rgba(74, 111, 165, 0.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 40px rgba(74, 111, 165, 0.45); }
.btn-ghost { color: var(--primary); background: #fff; box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.btn-ghost:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.btn-light { color: var(--primary); background: #fff; }
.btn-light:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }

/* ===========================================================
   导航
   =========================================================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.3s, box-shadow 0.3s, padding 0.3s;
  padding: 18px 0;
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  box-shadow: var(--shadow-sm); padding: 12px 0;
}
.nav .container { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 900; font-size: 22px; color: var(--ink); }
.brand img { height: 44px; width: 44px; border-radius: 11px; box-shadow: var(--shadow-sm); }
.brand small { display: block; font-size: 11.5px; font-weight: 700; letter-spacing: 0.2em; color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { font-weight: 600; color: var(--ink-2); font-size: 15px; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
.nav-cta {
  padding: 12px 26px; font-size: 16.5px; font-weight: 800; letter-spacing: 0.04em; color: var(--secondary);
  background: #fff;
  box-shadow: 0 8px 20px rgba(53, 80, 122, 0.28), 0 0 0 2px var(--secondary);
}
.nav-cta:hover { color: #fff; background: var(--secondary); box-shadow: 0 12px 26px rgba(192, 57, 43, 0.4), 0 0 0 2px var(--secondary); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; transition: 0.3s; }

/* ===========================================================
   Hero
   =========================================================== */
.hero {
  position: relative; padding: 170px 0 100px;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(104, 184, 215, 0.28), transparent 62%),
    radial-gradient(900px 560px at 8% 18%, rgba(123, 156, 199, 0.24), transparent 60%),
    linear-gradient(180deg, #FBFCFE 0%, var(--bg) 100%);
  overflow: hidden;
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center;
}
.hero-title {
  font-size: clamp(36px, 5.4vw, 62px); font-weight: 900; line-height: 1.1;
  letter-spacing: -0.02em; color: var(--ink);
}
.hero-title .grad {
  background: linear-gradient(120deg, var(--primary), var(--accent) 55%, var(--secondary));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-tagline { margin-top: 14px; font-size: clamp(19px, 2.6vw, 26px); font-weight: 900; color: var(--primary-dark); letter-spacing: 0.03em; line-height: 1.3; }
.hero-sub { margin-top: 18px; font-size: clamp(17px, 2.2vw, 21px); color: var(--ink-2); max-width: 540px; }
.hero-actions { margin-top: 38px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-badges { margin-top: 40px; display: flex; gap: 30px; flex-wrap: wrap; }
.hero-badge { display: flex; flex-direction: column; }
.hero-badge b { font-size: clamp(24px, 3.4vw, 34px); font-weight: 900; color: var(--primary); line-height: 1.1; }
.hero-badge span { font-size: 14px; color: var(--ink-2); font-weight: 600; }

/* Hero 插画：AI拍学机 */
.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-visual img { width: 100%; max-width: 420px; height: auto; filter: drop-shadow(0 30px 60px rgba(34,50,71,0.22)); }
.floaty { animation: floaty 6s ease-in-out infinite; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-16px); } }

/* ===========================================================
   信任条
   =========================================================== */
.trust { padding: 40px 0; border-bottom: 1px solid var(--border); background: #fff; }
.trust .container { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 18px 42px; }
.trust-item { display: flex; align-items: center; gap: 10px; color: var(--ink-2); font-weight: 600; font-size: 15px; }
.trust-item svg { width: 22px; height: 22px; color: var(--accent); }

/* ===========================================================
   痛点
   =========================================================== */
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pain-card {
  background: var(--card); border-radius: var(--radius); padding: 34px 30px;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.pain-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.pain-icon {
  width: 54px; height: 54px; border-radius: 15px; display: grid; place-items: center;
  background: rgba(192, 57, 43, 0.09); color: var(--secondary); margin-bottom: 18px;
}
.pain-icon svg { width: 28px; height: 28px; }
.pain-card h3 { font-size: 20px; font-weight: 800; margin-bottom: 10px; }
.pain-card p { color: var(--ink-2); font-size: 15.5px; }
.pain-card .arrow { margin-top: 18px; display: flex; align-items: center; gap: 8px; color: var(--primary); font-weight: 700; font-size: 14.5px; }
.pain-card .arrow svg { width: 18px; height: 18px; }

/* ===========================================================
   我拍我学 (featured)
   =========================================================== */
.snap { background: linear-gradient(160deg, #2A3F63 0%, #35507A 45%, #2E86AB 120%); color: #fff; overflow: hidden; }
.snap .eyebrow { background: rgba(255,255,255,0.14); color: #cfe5ef; }
.snap .section-title { color: #fff; }
.snap .section-sub { color: rgba(255,255,255,0.82); }
.snap-grid { display: grid; grid-template-columns: 0.92fr 1.08fr; gap: 56px; align-items: center; }
.snap-steps { display: flex; flex-direction: column; gap: 18px; }
.snap-step {
  display: flex; gap: 18px; align-items: flex-start;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14);
  border-radius: 18px; padding: 20px 22px; backdrop-filter: blur(6px);
  transition: transform 0.3s var(--ease), background 0.3s;
}
.snap-step:hover { transform: translateX(6px); background: rgba(255,255,255,0.13); }
.snap-step .num {
  flex-shrink: 0; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  font-weight: 900; font-size: 18px; background: linear-gradient(135deg, var(--warning), var(--secondary-light)); color: #fff;
}
.snap-step h4 { font-size: 18px; font-weight: 800; margin-bottom: 4px; }
.snap-step p { color: rgba(255,255,255,0.78); font-size: 15px; }
.snap-visual img { width: 100%; max-width: 420px; height: auto; filter: drop-shadow(0 24px 50px rgba(0,0,0,0.3)); }

/* ===========================================================
   六步闭环
   =========================================================== */
.steps-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.step-card {
  position: relative; background: var(--card); border-radius: var(--radius);
  padding: 30px 20px; text-align: center; box-shadow: var(--shadow-sm);
  border: 1px solid var(--border); transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.step-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); }
.step-card .step-n { position: absolute; top: 14px; right: 16px; font-size: 13px; font-weight: 800; color: var(--border); }
.step-ico { width: 56px; height: 56px; margin: 0 auto 16px; border-radius: 16px; display: grid; place-items: center; color: #fff; }
.step-ico svg { width: 28px; height: 28px; }
.step-card h4 { font-size: 16.5px; font-weight: 800; margin-bottom: 6px; }
.step-card p { font-size: 13.5px; color: var(--ink-2); }

/* ===========================================================
   使用场景
   =========================================================== */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.scene-card {
  background: var(--card); border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border);
  transition: transform 0.35s var(--ease), box-shadow 0.35s; display: flex; flex-direction: column;
}
.scene-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.scene-art { height: 200px; position: relative; overflow: hidden; }
.scene-art svg { width: 100%; height: 100%; display: block; }
.scene-tag {
  position: absolute; top: 16px; left: 16px; z-index: 2;
  font-size: 13px; font-weight: 700; color: #fff; padding: 6px 14px; border-radius: 999px;
  background: rgba(34, 50, 71, 0.42); backdrop-filter: blur(6px);
}
.scene-body { padding: 26px 26px 30px; flex: 1; display: flex; flex-direction: column; }
.scene-body h3 { font-size: 21px; font-weight: 800; margin-bottom: 10px; }
.scene-pain { font-size: 14px; color: var(--secondary); font-weight: 700; margin-bottom: 8px; display: flex; gap: 7px; align-items: center; }
.scene-pain svg { width: 16px; height: 16px; flex-shrink: 0; }
.scene-body p { color: var(--ink-2); font-size: 15px; }
.scene-list { margin-top: 16px; display: flex; flex-direction: column; gap: 9px; }
.scene-list li { list-style: none; display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; color: var(--ink); }
.scene-list svg { width: 18px; height: 18px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }

/* ===========================================================
   能力 / 内容库
   =========================================================== */
.feat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feat-card {
  background: var(--card); border-radius: var(--radius); padding: 30px 26px;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border);
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.feat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.feat-ico { width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 16px; background: rgba(46,134,171,0.10); color: var(--accent); }
.feat-ico svg { width: 26px; height: 26px; }
.feat-card h4 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.feat-card p { font-size: 14.5px; color: var(--ink-2); }

/* 内容库标签墙 */
.lib { margin-top: 56px; text-align: center; }
.lib h3 { font-size: 22px; font-weight: 800; margin-bottom: 14px; }
.lib-sub { font-size: 16px; color: var(--ink-2); max-width: 680px; margin: 0 auto 30px; }
.lib-tracks { display: flex; justify-content: center; flex-wrap: wrap; gap: 18px; margin-bottom: 34px; }
.lib-track {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  background: var(--card); border: 1px solid var(--border); border-radius: 18px;
  padding: 22px 30px; box-shadow: var(--shadow-sm); min-width: 200px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.lib-track:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.lib-track .lt-ico { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; margin-bottom: 4px; }
.lib-track .lt-ico svg { width: 24px; height: 24px; }
.lib-track b { font-size: 18px; font-weight: 800; color: var(--ink); }
.lib-track span:last-child { font-size: 13.5px; color: var(--ink-2); }
.lib-ladder {
  margin-top: 26px; font-size: 15px; font-weight: 700; color: var(--primary-dark);
  background: rgba(74, 111, 165, 0.08); display: inline-block; padding: 12px 26px; border-radius: 999px;
}
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; max-width: 820px; margin: 0 auto; }
.chip {
  padding: 11px 22px; border-radius: 999px; background: #fff; border: 1px solid var(--border);
  font-weight: 700; font-size: 15px; color: var(--primary-dark); box-shadow: var(--shadow-sm);
  transition: transform 0.2s, background 0.2s, color 0.2s;
}
.chip:hover { transform: translateY(-3px); background: var(--primary); color: #fff; }

/* ===========================================================
   PAD 形态
   =========================================================== */
.device-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.device-list { display: flex; flex-direction: column; gap: 22px; margin-top: 30px; }
.device-item { display: flex; gap: 16px; align-items: flex-start; }
.device-item .di-ico { flex-shrink: 0; width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; background: rgba(74,111,165,0.1); color: var(--primary); }
.device-item .di-ico svg { width: 24px; height: 24px; }
.device-item h4 { font-size: 17.5px; font-weight: 800; margin-bottom: 3px; }
.device-item p { font-size: 15px; color: var(--ink-2); }
.device-visual { display: flex; justify-content: center; }
.device-visual img { width: 100%; max-width: 420px; height: auto; filter: drop-shadow(0 26px 55px rgba(34,50,71,0.2)); }

/* ===========================================================
   CTA
   =========================================================== */
.cta { text-align: center; background: linear-gradient(135deg, var(--primary-dark), var(--accent)); color: #fff; }
.cta .section-title { color: #fff; }
.cta p { color: rgba(255,255,255,0.86); font-size: 18px; max-width: 560px; margin: 18px auto 34px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===========================================================
   页脚
   =========================================================== */
.footer { background: #1B2A40; color: rgba(255,255,255,0.72); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer .brand { color: #fff; margin-bottom: 16px; }
.footer .brand small { color: var(--accent-light); }
.footer-col h5 { color: #fff; font-size: 15px; font-weight: 800; margin-bottom: 16px; letter-spacing: 0.03em; }
.footer-col a, .footer-col p { display: block; color: rgba(255,255,255,0.66); font-size: 14.5px; margin-bottom: 11px; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-about { font-size: 14.5px; max-width: 300px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12); padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 13.5px; color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: #fff; }

/* ===========================================================
   APP 界面轮播
   =========================================================== */
.screens { background: linear-gradient(180deg, #FBFCFE 0%, var(--bg-soft) 100%); overflow: hidden; }
.screens-carousel { position: relative; max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.scr-track {
  display: flex; gap: 26px; overflow-x: auto; scroll-snap-type: x mandatory;
  padding: 14px 4px 30px; scroll-behavior: smooth;
  scrollbar-width: none; -ms-overflow-style: none;
}
.scr-track::-webkit-scrollbar { display: none; }
.scr-slide {
  flex: 0 0 auto; width: 268px; scroll-snap-align: center; text-align: center; margin: 0;
}
.scr-slide img {
  width: 100%; border-radius: 26px; box-shadow: var(--shadow-lg);
  border: 1px solid var(--border); background: #fff;
  transition: transform 0.3s var(--ease);
}
.scr-slide:hover img { transform: translateY(-6px); }
.scr-slide figcaption { margin-top: 16px; font-size: 14.5px; font-weight: 700; color: var(--primary-dark); }
.scr-nav {
  position: absolute; top: 44%; z-index: 5; width: 48px; height: 48px; border-radius: 50%;
  border: 1px solid var(--border); background: rgba(255,255,255,0.92); color: var(--primary);
  cursor: pointer; display: grid; place-items: center; box-shadow: var(--shadow-md);
  transition: transform 0.2s, background 0.2s; backdrop-filter: blur(6px);
}
.scr-nav svg { width: 24px; height: 24px; }
.scr-nav:hover { background: var(--primary); color: #fff; transform: scale(1.08); }
.scr-prev { left: -6px; }
.scr-next { right: -6px; }
.scr-dots { display: flex; justify-content: center; gap: 9px; margin-top: 6px; }
.scr-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--border); border: none; cursor: pointer; transition: width 0.3s, background 0.3s; padding: 0; }
.scr-dot.active { width: 26px; border-radius: 5px; background: var(--primary); }

/* ===========================================================
   硬件参数
   =========================================================== */
.specs-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 50px; align-items: center; }
.specs-photo {
  display: flex; justify-content: center;
}
.specs-photo img {
  width: 100%; max-width: 380px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); border: 1px solid var(--border); background: #fff;
}
.specs-table { display: flex; flex-direction: column; }
.spec-row {
  display: flex; align-items: flex-start; gap: 18px; padding: 15px 4px;
  border-bottom: 1px solid var(--border);
}
.spec-row:last-child { border-bottom: none; }
.spec-k {
  flex: 0 0 128px; display: flex; align-items: center; gap: 9px;
  font-weight: 800; font-size: 14.5px; color: var(--primary-dark);
}
.spec-k svg { width: 19px; height: 19px; color: var(--accent); flex-shrink: 0; }
.spec-v { flex: 1; color: var(--ink); font-size: 15px; line-height: 1.55; }

/* ===========================================================
   CTA 二维码
   =========================================================== */
.cta-contact { display: flex; justify-content: center; margin: 8px 0 30px; }
.cta-qr {
  background: #fff; border-radius: 22px; padding: 18px; box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column; align-items: center; gap: 12px; max-width: 260px;
}
.cta-qr img { width: 200px; height: 200px; object-fit: contain; border-radius: 12px; }
.cta-qr span { color: var(--ink-2); font-size: 13.5px; font-weight: 700; }
.cta-phone {
  background: rgba(255,255,255,0.08); border: 1.5px solid rgba(255,255,255,0.35); border-radius: 22px;
  padding: 22px 34px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
}
.cta-phone a { color: #fff; font-size: 42px; font-weight: 900; letter-spacing: 0.05em; line-height: 1.1; text-decoration: none; }
.cta-phone a:hover { color: #FDCB6E; }
.cta-phone span { color: rgba(255,255,255,0.72); font-size: 13.5px; }
.footer-qr { width: 118px; height: 118px; object-fit: contain; border-radius: 12px; background: #fff; padding: 6px; margin-bottom: 12px; }
.footer-tel { color: #fff !important; font-size: 16px !important; font-weight: 800; text-decoration: none; }

/* ===========================================================
   滚动动画
   =========================================================== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }
.reveal.d5 { transition-delay: 0.40s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .floaty { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width: 980px) {
  .hero-grid, .snap-grid, .device-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { order: -1; }
  .snap-visual { order: -1; }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .pain-grid, .scene-grid { grid-template-columns: 1fr; }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .specs-grid { grid-template-columns: 1fr; gap: 36px; }
  .specs-photo { order: -1; }
  .nav-links { gap: 22px; }
}
@media (max-width: 680px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; padding: 20px 24px; gap: 18px; box-shadow: var(--shadow-md); align-items: flex-start;
  }
  .nav-toggle { display: block; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-badges { gap: 20px; }
  .btn { width: 100%; }
  .hero-actions, .cta-actions { width: 100%; }
  .cta-contact { flex-direction: column; align-items: center; }
  .cta-phone { width: 100%; max-width: 320px; padding: 18px 20px; }
  .cta-phone a { font-size: 34px; }
  .scr-slide { width: 232px; }
  .scr-nav { display: none; }
  .spec-k { flex-basis: 104px; font-size: 13.5px; }
  .spec-v { font-size: 14px; }
  .lib-tracks { flex-direction: column; align-items: stretch; }
  .lib-track { min-width: 0; flex-direction: row; justify-content: flex-start; gap: 14px; padding: 16px 20px; }
  .lib-track .lt-ico { margin-bottom: 0; }
}