/* ==========================================================
   sino-hose.com — Design System & Component Library
   Build: pure static · mobile-first · industrial B2B
   ========================================================== */

/* ===== 1. DESIGN TOKENS ===== */
:root {
  /* Brand */
  --color-brand: #1D9E75;
  --color-brand-dark: #0F6E56;
  --color-brand-light: #E1F5EE;

  /* Neutrals */
  --color-ink: #1a1918;
  --color-ink-muted: #6b6966;
  --color-ink-faint: #a8a5a1;
  --color-surface: #ffffff;
  --color-surface-alt: #f7f6f4;
  --color-surface-deep: #f0ede8;
  --color-border: rgba(26, 25, 24, 0.12);
  --color-border-strong: rgba(26, 25, 24, 0.25);

  /* Scenario accent colors */
  --color-agri: #1D9E75;
  --color-mining: #B07D2B;
  --color-const: #2B6CB0;
  --color-indust: #7B3FA0;
  --color-food: #2E7D52;
  --color-fire: #C0392B;
  --color-oil: #5C4A1E;
  --color-munic: #4A6572;

  /* Typography */
  --font-primary: 'DM Sans', system-ui, -apple-system, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);

  /* Layout */
  --header-h: 64px;
  --content-max: 1200px;
  --content-narrow: 820px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ===== 2. RESET ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-brand);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-brand-dark);
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font: inherit;
  color: inherit;
}

/* ===== 3. UTILITY ===== */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container-narrow {
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ===== 4. TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-ink);
}

h1 {
  font-size: clamp(2rem, 5vw, var(--text-5xl));
}

h2 {
  font-size: clamp(1.5rem, 3vw, var(--text-3xl));
}

h3 {
  font-size: clamp(1.125rem, 2vw, var(--text-xl));
}

h4 {
  font-size: var(--text-lg);
}

p {
  max-width: 68ch;
  color: var(--color-ink-muted);
}

p + p {
  margin-top: var(--space-4);
}

.label-sm {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.label-base {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ===== 5. BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.2;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  border: 2px solid transparent;
}

.btn:active {
  transform: translateY(1px);
}

.btn:hover {
  text-decoration: none;
}

.btn-brand {
  background: var(--color-brand);
  color: var(--color-surface);
  border-color: var(--color-brand);
}

.btn-brand:hover {
  background: var(--color-brand-dark);
  border-color: var(--color-brand-dark);
  color: var(--color-surface);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border-strong);
}

.btn-outline:hover {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.btn-outline-light {
  background: transparent;
  color: var(--color-surface);
  border-color: rgba(255, 255, 255, 0.35);
}

.btn-outline-light:hover {
  border-color: var(--color-surface);
  color: var(--color-surface);
}

.btn-whatsapp {
  background: #25D366;
  color: var(--color-surface);
  border-color: #25D366;
}

.btn-whatsapp:hover {
  background: #1ebe5d;
  border-color: #1ebe5d;
  color: var(--color-surface);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--text-lg);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
}

.btn svg {
  flex-shrink: 0;
}

/* ===== 6. NAVIGATION ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: var(--header-h);
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.header-logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-ink);
  text-decoration: none;
  flex-shrink: 0;
  letter-spacing: -0.02em;
}

.header-logo:hover {
  color: var(--color-brand);
  text-decoration: none;
}

/* Desktop nav */
.header-nav {
  display: none;
  align-items: center;
  gap: 0;
  flex: 1;
}

.header-nav-list {
  display: flex;
  gap: 0;
  margin: 0 auto;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0 var(--space-4);
  height: var(--header-h);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-ink);
  text-decoration: none;
}

.nav-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-link svg {
  transform: rotate(180deg);
}

.nav-link-active {
  color: var(--color-ink);
  box-shadow: inset 0 -2px 0 var(--color-brand);
}

/* Mega dropdown */
.mega-dropdown {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 50%;
  transform: translateX(-50%);
  width: 520px;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.nav-item:hover .mega-dropdown {
  display: block;
}

.mega-dropdown-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.mega-dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
  transition: background var(--transition-fast);
}

.mega-dropdown-link:hover {
  background: var(--color-surface-alt);
  text-decoration: none;
}

.mega-dropdown-desc {
  display: block;
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

.header-actions {
  display: none;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-h);
  z-index: 999;
  background: var(--color-surface);
  overflow-y: auto;
  padding: var(--space-6) var(--space-5) var(--space-16);
}

.mobile-menu.is-open {
  display: block;
}

.mobile-nav-section {
  margin-bottom: var(--space-6);
}

.mobile-nav-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-sublist {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav-sublist a {
  padding: var(--space-2) 0;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
}

.mobile-nav-sublist a:hover {
  color: var(--color-brand);
}

.mobile-menu-actions {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 1024px) {
  .header-nav {
    display: flex;
  }

  .header-actions {
    display: flex;
  }

  .hamburger {
    display: none;
  }
}

/* ===== 7. SCENARIO ACCENT COLORS ===== */
.scenario-agri {
  --scenario-color: var(--color-agri);
}
.scenario-mining {
  --scenario-color: var(--color-mining);
}
.scenario-const {
  --scenario-color: var(--color-const);
}
.scenario-indust {
  --scenario-color: var(--color-indust);
}
.scenario-food {
  --scenario-color: var(--color-food);
}
.scenario-fire {
  --scenario-color: var(--color-fire);
}
.scenario-oil {
  --scenario-color: var(--color-oil);
}
.scenario-munic {
  --scenario-color: var(--color-munic);
}

/* ===== 8. HERO ===== */
.hero-full {
  padding: var(--space-16) 0 var(--space-20);
  background: var(--color-ink);
  color: var(--color-surface);
  position: relative;
  overflow: hidden;
}

.hero-full::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, rgba(255,255,255,0.02) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.02) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.02) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.02) 75%);
  background-size: 40px 40px;
  background-position: 0 0, 0 20px, 20px -20px, -20px 0;
  pointer-events: none;
}

.hero-full h1 {
  max-width: 14ch;
  margin-bottom: var(--space-6);
  color: var(--color-surface);
  position: relative;
  z-index: 1;
}

.hero-full p {
  max-width: 60ch;
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-8);
  position: relative;
  z-index: 1;
}

.hero-full .btn-group {
  position: relative;
  z-index: 1;
}

/* Split hero (hub pages) */
.hero-split {
  padding: var(--space-16) 0;
  background: var(--color-surface-alt);
}

.hero-split-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
}

.hero-split-text {
  border-left: 4px solid var(--scenario-color, var(--color-brand));
  padding-left: var(--space-6);
}

.hero-split-text h1 {
  margin-bottom: var(--space-4);
}

.hero-split-image {
  aspect-ratio: 16 / 9;
  background: var(--color-surface-deep);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.hero-split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Narrow hero (sub-pages) */
.hero-narrow {
  padding: var(--space-12) 0 var(--space-10);
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-bottom: var(--space-6);
}

.breadcrumb a {
  color: var(--color-ink-muted);
}

.breadcrumb a:hover {
  color: var(--color-brand);
}

.breadcrumb-sep {
  color: var(--color-ink-faint);
}

.scenario-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  background: var(--scenario-color, var(--color-brand));
  color: var(--color-surface);
  margin-bottom: var(--space-4);
}

.hero-narrow h1 {
  margin-bottom: var(--space-3);
}

.hero-narrow p {
  max-width: 60ch;
}

@media (min-width: 768px) {
  .hero-split-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .hero-full {
    padding: var(--space-24) 0;
  }
}

/* ===== 9. SCENARIO NAV CARDS ===== */
.scenario-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.scenario-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--scenario-color, var(--color-border));
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.scenario-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
  color: inherit;
}

.scenario-card-icon {
  width: 32px;
  height: 32px;
  color: var(--scenario-color, var(--color-brand));
}

.scenario-card h3 {
  font-size: var(--text-base);
  font-weight: 600;
}

.scenario-card-desc {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.5;
}

.scenario-card-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--scenario-color, var(--color-brand));
}

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

@media (min-width: 1024px) {
  .scenario-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== 10. SUB-PAGE CARDS (hub page grid) ===== */
.subpage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.subpage-card {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.subpage-card:hover {
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
}

.subpage-card .scenario-pill {
  align-self: flex-start;
  margin-bottom: var(--space-1);
}

.subpage-card h3 {
  font-size: var(--text-base);
}

.subpage-card p {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.5;
}

.subpage-card .arrow-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--scenario-color, var(--color-brand));
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

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

@media (min-width: 1024px) {
  .subpage-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 11. PRODUCT SOLUTION BLOCK ===== */
.solution-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
  padding: var(--space-12) 0;
}

.solution-block + .solution-block {
  border-top: 1px solid var(--color-border);
}

.solution-context {
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.solution-block h2 {
  margin-bottom: var(--space-4);
}

.solution-block p {
  font-size: var(--text-base);
}

.solution-image {
  aspect-ratio: 16 / 9;
  background: var(--color-surface-deep);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.solution-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.spec-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.spec-pill {
  display: inline-flex;
  padding: 0.25rem 0.75rem;
  font-size: var(--text-sm);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  color: var(--color-ink);
  background: var(--color-surface);
  line-height: 1.4;
}

@media (min-width: 768px) {
  .solution-block {
    grid-template-columns: 1fr 1fr;
  }

  .solution-block:nth-child(even) .solution-image {
    order: 1;
  }

  .solution-block:nth-child(even) .solution-text {
    order: 2;
  }
}

/* ===== 12. PAIN POINTS ===== */
.pain-points {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.pain-point {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.pain-point-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  color: var(--scenario-color, var(--color-brand));
}

.pain-point h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.pain-point p {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .pain-points {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 13. CASE STUDY ===== */
.case-study-block {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
}

.case-study-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.case-study-tag {
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

.case-study-tag-region {
  background: var(--color-brand-light);
  color: var(--color-brand-dark);
}

.case-study-tag-industry {
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
}

.case-study-block blockquote {
  margin: 0;
}

.case-study-block blockquote p {
  font-size: var(--text-base);
  color: var(--color-ink);
  margin-bottom: var(--space-3);
  line-height: 1.7;
}

.case-study-block blockquote p:last-child {
  margin-bottom: 0;
}

.case-study-label {
  font-weight: 600;
  color: var(--color-brand);
}

/* Mini case study (compact strip) */
.case-mini {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.case-mini blockquote p {
  font-size: var(--text-sm);
  line-height: 1.6;
}

.case-mini blockquote p:first-child {
  font-style: italic;
  color: var(--color-ink);
  margin-bottom: var(--space-3);
}

/* ===== 14. FAQ ===== */
.faq-list {
  max-width: var(--content-narrow);
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) 0;
}

.faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq-question {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  user-select: none;
}

.faq-question::after {
  content: '+';
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-ink-faint);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item.is-open .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.7;
  display: none;
  max-width: 68ch;
}

.faq-item.is-open .faq-answer {
  display: block;
  margin-top: var(--space-3);
}

/* ===== 15. TRUST BAR ===== */
.trust-bar {
  padding: var(--space-8) 0;
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.trust-bar-inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  text-align: center;
}

.trust-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.trust-value {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-ink);
}

.trust-label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

@media (min-width: 640px) {
  .trust-bar-inner {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ===== 16. FEATURED CARDS ===== */
.featured-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.featured-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition-fast);
}

.featured-card:hover {
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
}

.featured-card-image {
  aspect-ratio: 16 / 9;
  background: var(--color-surface-deep);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.featured-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-card h3 {
  margin-bottom: var(--space-2);
}

.featured-card p {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .featured-card {
    grid-template-columns: 1fr 1fr;
  }

  .featured-grid {
    grid-template-columns: 1fr;
    max-width: 900px;
    margin: 0 auto;
  }
}

/* ===== 17. DIFFERENTIATION SECTION ===== */
.diff-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.diff-card {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.diff-card h3 {
  margin-bottom: var(--space-3);
}

.diff-card p {
  font-size: var(--text-sm);
  max-width: 40ch;
  margin: 0 auto;
}

.diff-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-4);
  color: var(--color-brand);
}

@media (min-width: 768px) {
  .diff-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 18. SELECTION GUIDE WIDGET ===== */
.selection-guide {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.selection-step {
  display: none;
}

.selection-step.is-active {
  display: block;
}

.selection-step-number {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-brand);
  margin-bottom: var(--space-3);
}

.selection-step h3 {
  margin-bottom: var(--space-6);
}

.selection-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.selection-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  text-align: center;
}

.selection-option:hover {
  border-color: var(--color-brand);
  background: var(--color-brand-light);
}

.selection-option.is-selected {
  border-color: var(--color-brand);
  background: var(--color-brand-light);
}

.selection-option svg {
  width: 28px;
  height: 28px;
  color: var(--color-ink);
}

.selection-option-label {
  font-size: var(--text-sm);
  font-weight: 500;
}

.selection-result {
  display: none;
  margin-top: var(--space-8);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.selection-result.is-visible {
  display: block;
}

.selection-result h4 {
  color: var(--color-brand);
  margin-bottom: var(--space-2);
}

.selection-result p {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

@media (min-width: 640px) {
  .selection-options {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 19. CTA BAND ===== */
.cta-band {
  padding: var(--space-16) 0;
  background: var(--color-ink);
  color: var(--color-surface);
  text-align: center;
}

.cta-band h2 {
  color: var(--color-surface);
  margin-bottom: var(--space-4);
}

.cta-band p {
  color: rgba(255, 255, 255, 0.7);
  margin: 0 auto var(--space-8);
  max-width: 55ch;
}

.cta-band-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ===== 20. SECTION / DIVIDERS ===== */
.section-block {
  padding: var(--space-16) 0;
}

.section-block-sm {
  padding: var(--space-10) 0;
}

.section-block-alt {
  background: var(--color-surface-alt);
}

.section-block-deep {
  background: var(--color-surface-deep);
}

.section-dark {
  background: var(--color-ink);
  color: var(--color-surface);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-10);
}

.section-header h2 {
  margin-bottom: var(--space-3);
}

.section-header p {
  margin: 0 auto;
  max-width: 60ch;
}

.section-hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
}

/* ===== 21. QUOTE BAND (used on all pages) ===== */
.quote-band {
  padding: var(--space-12) 0;
  background: var(--color-brand);
  color: var(--color-surface);
  text-align: center;
}

.quote-band h2 {
  color: var(--color-surface);
  margin-bottom: var(--space-3);
  font-size: clamp(1.375rem, 3vw, var(--text-3xl));
}

.quote-band p {
  color: rgba(255, 255, 255, 0.85);
  margin: 0 auto var(--space-6);
  max-width: 55ch;
  font-size: var(--text-lg);
}

.quote-band-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.quote-band .btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ===== 22. FOOTER ===== */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.65);
  padding: var(--space-16) 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-surface);
  margin-bottom: var(--space-4);
}

.footer-col p {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.7;
  max-width: 40ch;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-nav a {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-brand);
  text-decoration: none;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-contact-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-contact-item:hover {
  color: var(--color-brand);
  text-decoration: none;
}

.footer-contact-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.footer-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.footer-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.55);
}

.footer-bottom {
  margin-top: var(--space-10);
  padding: var(--space-6) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.35);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== 23. CONTACT FORM ===== */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-ink);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--text-base);
  font-family: var(--font-primary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-brand);
  box-shadow: 0 0 0 3px var(--color-brand-light);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

/* ===== 24. ABOUT PAGE SPECIFICS ===== */
.about-lead {
  font-size: var(--text-xl);
  line-height: 1.6;
  color: var(--color-ink);
  max-width: 60ch;
}

.metrics-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  text-align: center;
}

.metric-number {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-brand);
  line-height: 1.1;
}

.metric-label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

@media (min-width: 640px) {
  .metrics-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== 25. INTERNAL LINKS SECTION ===== */
.internal-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.internal-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.internal-link:hover {
  border-color: var(--color-brand);
  background: var(--color-brand-light);
  text-decoration: none;
  color: var(--color-ink);
}

@media (min-width: 640px) {
  .internal-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 26. HORIZONTAL CARD STRIP ===== */
.card-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .card-strip {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 27. PRINT ===== */
@media print {
  .site-header,
  .cta-band,
  .quote-band,
  .site-footer {
    display: none;
  }

  .section-block {
    padding: 1rem 0;
    break-inside: avoid;
  }
}

/* ===== 28. SELECTION GUIDE PAGE SPECIFICS ===== */
.sg-progress {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.sg-step-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-faint);
}

.sg-step-indicator.is-active {
  color: var(--color-brand);
}

.sg-step-indicator.is-done {
  color: var(--color-brand-dark);
}

.sg-step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-border-strong);
  font-size: var(--text-sm);
  font-weight: 600;
}

.sg-step-indicator.is-active .sg-step-number {
  border-color: var(--color-brand);
  background: var(--color-brand);
  color: var(--color-surface);
}

.sg-step-indicator.is-done .sg-step-number {
  border-color: var(--color-brand-dark);
  background: var(--color-brand-dark);
  color: var(--color-surface);
}

.sg-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-8);
}