/* ==========================================================================
   云梯 (yunti.shop) - 冰川科技 Glacier Tech 官方样式库
   规范：纯粹技术导向、冷峻冰蓝、高精细边框、流动冰霜流光
   ========================================================================== */

:root {
  --bg-dark: #050a12;
  --bg-deep: #081120;
  --bg-surface: #0c1a2f;
  --bg-surface-alt: #10233f;
  --bg-card: rgba(12, 26, 47, 0.75);
  --bg-card-hover: rgba(16, 35, 63, 0.9);
  
  --ice-100: #f0f9ff;
  --ice-200: #e0f2fe;
  --ice-300: #bae6fd;
  --ice-400: #7dd3fc;
  --ice-500: #38bdf8;
  --ice-600: #0284c7;
  --ice-700: #0369a1;

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border-fine: rgba(56, 189, 248, 0.2);
  --border-light: rgba(125, 211, 252, 0.35);
  --border-glow: rgba(56, 189, 248, 0.6);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.68;
  background-image: 
    radial-gradient(ellipse 90% 60% at 50% -15%, rgba(56, 189, 248, 0.15), transparent 70%),
    radial-gradient(circle 800px at 85% 30%, rgba(2, 132, 199, 0.08), transparent 80%),
    linear-gradient(to bottom, #050a12, #07101e 50%, #050a12 100%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  word-wrap: break-word;
}

/* Links & Typography */
a {
  color: var(--ice-400);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--ice-300);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--ice-100);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.015em;
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

li {
  margin-bottom: 0.5rem;
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
}

/* Container & Layout */
.container {
  width: 100%;
  max-width: 1140px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.container-narrow {
  max-width: 840px;
}

/* Glacier Card with Moving Light Edge */
.card-glacier {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-fine);
  padding: 1.75rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: var(--transition);
}

/* Moving Light Edge Effect */
.card-glacier::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(56, 189, 248, 0) 20%,
    rgba(125, 211, 252, 0.45) 50%,
    rgba(56, 189, 248, 0) 80%,
    transparent 100%
  );
  background-size: 200% 100%;
  border-radius: calc(var(--radius-md) + 2px);
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
  animation: glacierSweep 6s linear infinite;
}

.card-glacier::after {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  z-index: 1;
  pointer-events: none;
}

.card-glacier > * {
  position: relative;
  z-index: 2;
}

.card-glacier:hover {
  border-color: var(--border-glow);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.15);
  transform: translateY(-2px);
}

.card-glacier:hover::before {
  opacity: 0.85;
  animation-duration: 3.5s;
}

@keyframes glacierSweep {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 10, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-fine);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--ice-300);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--ice-500), var(--ice-300));
  border-radius: 2px;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn-glacier-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 50%, #38bdf8 100%);
  color: #031326;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.3);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  max-width: 100%;
  white-space: normal;
  text-align: center;
}

.btn-glacier-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #0284c7 50%, #38bdf8 100%);
  color: #020c18;
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.55);
  transform: translateY(-1px);
}

.btn-glacier-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: rgba(12, 26, 47, 0.85);
  color: var(--ice-300);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}

.btn-glacier-secondary:hover {
  background: rgba(16, 35, 63, 1);
  border-color: var(--ice-400);
  color: var(--ice-100);
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-fine);
  color: var(--ice-400);
  padding: 0.5rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.25rem;
}

/* Section Common Styling */
.section-py {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
}

.section-head {
  text-align: center;
  margin-bottom: 3.25rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.28);
  color: var(--ice-400);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.15rem;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-muted);
}

/* Hero Section */
.hero-section {
  padding-top: 5rem;
  padding-bottom: 4.5rem;
  position: relative;
}

.hero-content {
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(12, 26, 47, 0.85);
  border: 1px solid var(--border-light);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--ice-300);
  margin-bottom: 1.5rem;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--ice-500);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--ice-500);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(180deg, #ffffff 30%, #bae6fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

/* Technical Checklist Box */
.glacier-box {
  background: rgba(10, 20, 36, 0.85);
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  background: rgba(16, 32, 58, 0.5);
  border: 1px solid rgba(56, 189, 248, 0.12);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.check-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.15);
  color: var(--ice-400);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: bold;
}

.check-title {
  font-weight: 600;
  color: var(--ice-200);
  margin-bottom: 0.25rem;
}

.check-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.5;
}

/* Minimalist Service & Plans Block */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.spec-badge-unverified {
  display: inline-block;
  background: rgba(234, 179, 8, 0.12);
  border: 1px solid rgba(234, 179, 8, 0.35);
  color: #fde047;
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.spec-badge-verified {
  display: inline-block;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: var(--ice-300);
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.spec-list {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0;
}

.spec-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px dashed rgba(56, 189, 248, 0.12);
  font-size: 0.9rem;
}

.spec-label {
  color: var(--text-muted);
}

.spec-val {
  color: var(--ice-200);
  font-weight: 500;
}

.disclaimer-banner {
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-left: 4px solid var(--ice-500);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.disclaimer-banner strong {
  color: var(--ice-200);
}

/* Articles Showcase Grid */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--ice-500);
  margin-bottom: 0.75rem;
}

.article-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  line-height: 1.45;
}

.article-title a {
  color: var(--ice-100);
}

.article-title a:hover {
  color: var(--ice-400);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(56, 189, 248, 0.12);
  padding-top: 1rem;
  font-size: 0.85rem;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--ice-400);
  font-weight: 600;
}

.article-link:hover {
  color: var(--ice-200);
  transform: translateX(3px);
}

/* Review & Feedback Cards Grid (Figure 2 Style) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 991px) {
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

.review-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.review-stars {
  color: var(--ice-500);
  font-size: 1.05rem;
  letter-spacing: 3px;
  margin-bottom: 0.85rem;
}

.review-text {
  font-size: 0.92rem;
  line-height: 1.75;
  color: #cbd5e1;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(56, 189, 248, 0.12);
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #030d1a;
  font-weight: 800;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.35);
}

.review-name {
  font-weight: 700;
  color: var(--ice-100);
  font-size: 0.95rem;
}

.review-role {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

/* Feedback Section ("提交使用反馈") */
.feedback-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  max-width: 780px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ice-200);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  background: rgba(6, 11, 20, 0.7);
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--ice-500);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
}

.form-radio-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-radio-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 32, 58, 0.6);
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-pill);
  padding: 0.4rem 1rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.form-radio-pill:has(input:checked) {
  background: rgba(56, 189, 248, 0.18);
  border-color: var(--ice-400);
  color: var(--ice-100);
}

.form-note {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
  margin-bottom: 0;
}

.feedback-status {
  display: none;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.feedback-status.success {
  display: block;
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.4);
  color: #86efac;
}

/* FAQ Accordion */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: rgba(12, 26, 47, 0.65);
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-light);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  background: transparent;
  border: none;
  padding: 1.25rem 1.5rem;
  color: var(--ice-100);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  gap: 1rem;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--ice-400);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 1.5rem 1.5rem 1.5rem;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Table Responsive wrapper */
.table-container {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.5rem 0;
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-sm);
}

.glacier-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.glacier-table th {
  background: rgba(16, 35, 63, 0.95);
  color: var(--ice-300);
  font-weight: 600;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-fine);
  white-space: nowrap;
}

.glacier-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(56, 189, 248, 0.08);
  color: var(--text-muted);
}

.glacier-table tr:hover td {
  background: rgba(56, 189, 248, 0.04);
  color: var(--ice-100);
}

/* Article Detail Post */
.article-header {
  padding-top: 4rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-fine);
  margin-bottom: 2.5rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--ice-400);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-content h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--ice-200);
  border-left: 3px solid var(--ice-500);
  padding-left: 0.85rem;
}

.article-content h3 {
  font-size: 1.25rem;
  margin-top: 1.85rem;
  margin-bottom: 0.75rem;
  color: var(--ice-300);
}

.article-content ul, .article-content ol {
  padding-left: 1.75rem;
  margin-bottom: 1.5rem;
}

.article-content li {
  margin-bottom: 0.65rem;
}

.article-content strong {
  color: var(--ice-100);
}

.article-callout {
  background: rgba(16, 35, 63, 0.6);
  border-left: 4px solid var(--ice-400);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.article-callout.warning {
  border-left-color: #f59e0b;
  background: rgba(245, 158, 11, 0.08);
}

.article-callout.tip {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.08);
}

.article-nav-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-fine);
}

.article-nav-card {
  padding: 1.25rem;
  background: rgba(12, 26, 47, 0.6);
  border: 1px solid var(--border-fine);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
}

.article-nav-card:hover {
  border-color: var(--border-glow);
  background: rgba(16, 35, 63, 0.8);
}

.article-nav-label {
  font-size: 0.8rem;
  color: var(--ice-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.article-nav-title {
  font-size: 0.95rem;
  color: var(--ice-100);
  font-weight: 600;
}

/* Footer */
.site-footer {
  background: #040810;
  border-top: 1px solid var(--border-fine);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-dim);
  max-width: 320px;
  margin-top: 1rem;
}

.footer-col-title {
  color: var(--ice-200);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.65rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: var(--ice-400);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(56, 189, 248, 0.08);
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive Media Queries */
@media (max-width: 991px) {
  .hero-title {
    font-size: 2.4rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: #060d19;
    border-bottom: 1px solid var(--border-light);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    box-shadow: 0 10px 25px rgba(0,0,0,0.6);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-cta {
    display: none;
  }

  .hero-title {
    font-size: 1.95rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .article-grid, .spec-grid, .checklist-grid {
    grid-template-columns: 1fr;
  }

  .article-nav-links {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feedback-box {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.65rem;
  }
  .btn-glacier-primary, .btn-glacier-secondary {
    width: 100%;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
}