/* ========================================
   巡宿智能 — Design System (styles.css)
   tech-dark / IoT-precision aesthetic
   ======================================== */

/* ---------- Design Tokens ---------- */
:root {
  --c-primary: #2563eb;
  --c-primary-hover: #1d4ed8;
  --c-accent: #06b6d4;
  --c-bg: #0a0e1a;
  --c-surface: #141a2e;
  --c-surface-hover: #1e2745;
  --c-border: #2a3454;
  --c-text: #e2e8f0;
  --c-text-sub: #94a3b8;
  --c-text-dim: #64748b;
  --c-success: #10b981;
  --c-warning: #f59e0b;
  --c-danger: #ef4444;

  --grad-hero: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(37,99,235,0.18) 0%, transparent 65%);
  --grad-surface: linear-gradient(180deg, #141a2e 0%, #0f1424 100%);
  --grad-primary: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --grad-accent: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);

  --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 20px;

  --sh-sm: 0 2px 8px rgba(0,0,0,0.3);
  --sh-md: 0 4px 24px rgba(0,0,0,0.4);
  --sh-lg: 0 8px 40px rgba(0,0,0,0.5);
  --sh-glow: 0 0 30px rgba(37,99,235,0.25);

  --maxw: 1280px;
  --header-h: 72px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 80px 0; position: relative; }
.section-lg { padding: 100px 0; }

/* ---------- Background Texture ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--grad-hero);
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(42,52,84,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,52,84,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ---------- Header / Nav Shell ---------- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(10, 14, 26, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(42, 52, 84, 0.5);
  transition: background 0.3s var(--ease);
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.5px;
  color: var(--c-text);
}
.logo-icon {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 8px 18px;
  border-radius: var(--r-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text-sub);
  transition: all 0.2s var(--ease);
  position: relative;
}
.nav-links a:hover { color: var(--c-text); background: rgba(255,255,255,0.04); }
.nav-links a.active {
  color: var(--c-text);
  background: rgba(37,99,235,0.12);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--c-primary);
  border-radius: 1px;
}
.nav-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-accent);
  white-space: nowrap;
}
.nav-phone svg { width: 18px; height: 18px; }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--c-text);
  border-radius: 1px;
  transition: 0.3s var(--ease);
}

/* ---------- Footer ---------- */
.footer {
  background: #060912;
  border-top: 1px solid rgba(42, 52, 84, 0.4);
  padding: 48px 0 32px;
  position: relative;
  z-index: 1;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-brand .logo { font-size: 18px; }
.footer-desc {
  font-size: 14px;
  color: var(--c-text-dim);
  max-width: 320px;
  line-height: 1.7;
}
.footer-links {
  display: flex;
  gap: 48px;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--c-text-dim);
  padding: 4px 0;
  transition: color 0.2s var(--ease);
}
.footer-col a:hover { color: var(--c-accent); }
.footer-contact {
  text-align: right;
}
.footer-contact .phone-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: 4px;
}
.footer-contact .phone-label {
  font-size: 13px;
  color: var(--c-text-dim);
}
.footer-bottom {
  max-width: var(--maxw);
  margin: 32px auto 0;
  padding: 20px 24px 0;
  border-top: 1px solid rgba(42, 52, 84, 0.3);
  text-align: center;
  font-size: 13px;
  color: var(--c-text-dim);
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 16px;
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 100px;
  background: rgba(6, 182, 212, 0.06);
}
.section-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-text);
}
.section-subtitle {
  margin-top: 12px;
  font-size: 16px;
  color: var(--c-text-sub);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--r-md);
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-body);
  transition: all 0.25s var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(37, 99, 235, 0.45);
}
.btn-outline {
  border: 1px solid var(--c-border);
  color: var(--c-text-sub);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--c-primary);
  color: var(--c-text);
  background: rgba(37, 99, 235, 0.06);
}

/* ---------- Cards ---------- */
.card {
  background: var(--grad-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px;
  transition: all 0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37,99,235,0.4), transparent);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.card:hover {
  border-color: rgba(37, 99, 235, 0.35);
  transform: translateY(-4px);
  box-shadow: var(--sh-lg);
}
.card:hover::before { opacity: 1; }

/* Icon container in cards */
.card-icon {
  width: 52px; height: 52px;
  border-radius: var(--r-md);
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--c-accent);
  flex-shrink: 0;
}
.card-icon svg { width: 26px; height: 26px; }
.card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--c-text);
}
.card p {
  font-size: 14px;
  color: var(--c-text-sub);
  line-height: 1.7;
}

/* ---------- Grid ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }

/* ---------- Hero (Home) ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 120px 24px 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  top: -200px; left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(37,99,235,0.12) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-bg::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  bottom: -100px; right: 10%;
  background: radial-gradient(circle, rgba(6,182,212,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.25);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 8px; height: 8px;
  background: var(--c-accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.hero-title {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #fff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 18px;
  color: var(--c-text-sub);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

/* ---------- Page Hero (sub-pages) ---------- */
.page-hero {
  padding: 140px 0 60px;
  text-align: center;
  position: relative;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}
.page-hero p {
  font-size: 17px;
  color: var(--c-text-sub);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- Feature List ---------- */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--c-text);
  line-height: 1.6;
}
.feature-item svg {
  width: 22px; height: 22px;
  color: var(--c-success);
  flex-shrink: 0;
  margin-top: 2px;
}
.feature-item span { color: var(--c-text-sub); }

/* ---------- Tech Highlights ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.tech-item {
  text-align: center;
  padding: 32px 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  transition: all 0.3s var(--ease);
}
.tech-item:hover {
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-4px);
}
.tech-item .tech-icon {
  width: 48px; height: 48px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent);
}
.tech-item .tech-icon svg { width: 24px; height: 24px; }
.tech-item h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--c-text);
}
.tech-item p {
  font-size: 13px;
  color: var(--c-text-sub);
  line-height: 1.6;
}

/* ---------- Product Showcase ---------- */
.product-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.product-visual {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--r-lg);
  background: var(--grad-surface);
  border: 1px solid var(--c-border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(37,99,235,0.08) 0%, transparent 60%);
}
.product-visual-inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.product-visual .sensor-ring {
  width: 200px; height: 200px;
  border-radius: 50%;
  border: 2px solid rgba(37,99,235,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  position: relative;
}
.product-visual .sensor-ring::before,
.product-visual .sensor-ring::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(6,182,212,0.15);
}
.product-visual .sensor-ring::before { inset: -20px; }
.product-visual .sensor-ring::after { inset: -40px; border-color: rgba(37,99,235,0.08); }
.product-visual .sensor-ring svg {
  width: 80px; height: 80px;
  color: var(--c-accent);
}
.product-visual .sensor-label {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-text-sub);
  letter-spacing: 1px;
}
.product-info .section-eyebrow { margin-bottom: 16px; }
.product-info h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}
.product-info > p {
  font-size: 15px;
  color: var(--c-text-sub);
  line-height: 1.8;
  margin-bottom: 24px;
}

/* Spec badges */
.spec-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}
.spec-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.2);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-accent);
}
.spec-badge svg { width: 14px; height: 14px; }

/* ---------- Scene Cards ---------- */
.scene-card {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--grad-surface);
  border: 1px solid var(--c-border);
  transition: all 0.3s var(--ease-out);
  min-height: 280px;
  display: flex;
  flex-direction: column;
}
.scene-card:hover {
  border-color: rgba(37, 99, 235, 0.35);
  transform: translateY(-4px);
  box-shadow: var(--sh-lg);
}
.scene-card-visual {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(180deg, rgba(37,99,235,0.06) 0%, transparent 100%);
}
.scene-card-visual svg { width: 56px; height: 56px; color: var(--c-accent); opacity: 0.7; }
.scene-card-body { padding: 24px; flex: 1; }
.scene-card-body .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-accent);
  margin-bottom: 10px;
}
.scene-card-body h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}
.scene-card-body p {
  font-size: 14px;
  color: var(--c-text-sub);
  line-height: 1.7;
}

/* ---------- Energy Saving ---------- */
.energy-section {
  background: linear-gradient(180deg, transparent 0%, rgba(37,99,235,0.03) 50%, transparent 100%);
}
.energy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}
.energy-card {
  background: var(--grad-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px;
  text-align: center;
}
.energy-card .season {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-accent);
  margin-bottom: 20px;
}
.energy-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid rgba(42, 52, 84, 0.4);
  font-size: 14px;
}
.energy-row:last-of-type { border-bottom: none; }
.energy-row .label { color: var(--c-text-sub); }
.energy-row .value { font-family: var(--font-mono); font-weight: 600; color: var(--c-text); }
.energy-save {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 2px solid var(--c-border);
}
.energy-save .save-label { font-size: 14px; color: var(--c-text-sub); margin-bottom: 4px; }
.energy-save .save-value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: var(--c-success);
}
.energy-conclusion {
  text-align: center;
  margin-top: 48px;
  padding: 24px 40px;
  border-radius: var(--r-lg);
  background: rgba(16, 185, 129, 0.06);
  border: 1px solid rgba(16, 185, 129, 0.2);
}
.energy-conclusion p {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--c-success);
}

/* ---------- Hardware Spec Table ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-surface);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
}
.spec-table th {
  background: var(--c-surface-hover);
  padding: 16px 24px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  border-bottom: 1px solid var(--c-border);
}
.spec-table td {
  padding: 14px 24px;
  font-size: 14px;
  border-bottom: 1px solid rgba(42, 52, 84, 0.4);
}
.spec-table td:first-child { color: var(--c-text-sub); width: 30%; }
.spec-table td:last-child { font-family: var(--font-mono); color: var(--c-text); }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tr:hover td { background: rgba(37, 99, 235, 0.03); }

/* ---------- Comparison Table ---------- */
.compare-section { overflow-x: auto; }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  min-width: 700px;
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  font-size: 14px;
  border-bottom: 1px solid rgba(42, 52, 84, 0.4);
  vertical-align: top;
}
.compare-table th {
  background: var(--c-surface-hover);
  font-weight: 600;
  text-align: left;
}
.compare-table th.col-ai { color: var(--c-accent); }
.compare-table th.col-trad { color: var(--c-text-dim); }
.compare-table td:first-child { color: var(--c-text-sub); font-weight: 500; width: 18%; }
.compare-table td.col-ai { color: var(--c-text); }
.compare-table td.col-trad { color: var(--c-text-sub); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:hover td { background: rgba(37, 99, 235, 0.02); }

/* ---------- Solution Diagram ---------- */
.solution-diagram {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}
.solution-card {
  background: var(--grad-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px;
  transition: all 0.3s var(--ease);
}
.solution-card:hover { border-color: rgba(37, 99, 235, 0.3); }
.solution-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.solution-card h3 svg { width: 22px; height: 22px; color: var(--c-accent); }
.solution-card p {
  font-size: 14px;
  color: var(--c-text-sub);
  line-height: 1.7;
  margin-bottom: 20px;
}
.solution-flow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 14px;
}
.solution-flow .node {
  padding: 8px 16px;
  border-radius: var(--r-sm);
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  color: var(--c-accent);
}
.solution-flow .arrow {
  color: var(--c-text-dim);
  font-size: 18px;
}

/* ---------- CTA Section ---------- */
.cta-section {
  text-align: center;
  padding: 80px 24px;
  background: linear-gradient(180deg, transparent 0%, rgba(37,99,235,0.06) 100%);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border);
  margin: 0 24px;
}
.cta-section h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}
.cta-section p {
  font-size: 16px;
  color: var(--c-text-sub);
  margin-bottom: 32px;
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeInUp 0.7s var(--ease-out) both; }
.fade-up-1 { animation-delay: 0.1s; }
.fade-up-2 { animation-delay: 0.2s; }
.fade-up-3 { animation-delay: 0.3s; }
.fade-up-4 { animation-delay: 0.4s; }

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .product-showcase { grid-template-columns: 1fr; }
  .product-visual { max-width: 400px; margin: 0 auto; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-lg { padding: 72px 0; }
  .hero-title { font-size: 36px; }
  .hero-subtitle { font-size: 16px; }
  .page-hero h1 { font-size: 28px; }
  .page-hero p { font-size: 15px; }
  .section-title { font-size: 24px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .energy-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-diagram { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
  .footer-links { gap: 32px; }
  .footer-contact { text-align: left; }

  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 16px;
    gap: 0;
    border-bottom: 1px solid var(--c-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s var(--ease);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { width: 100%; padding: 14px 18px; }
  .nav-links a.active::after { display: none; }
  .nav-phone { display: none; }
}

@media (max-width: 480px) {
  .tech-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .cta-section { margin: 0 16px; padding: 56px 16px; }
  .container { padding: 0 16px; }
}