/* ============================================================
   PAI Design System — CLdN-Inspired
   Colors, typography, components, layout, responsive
   ============================================================ */

/* ── Custom Properties ───────────────────────────────────── */
:root {
  /* Colors */
  --color-navy:       #1B3F6E;
  --color-navy-dark:  #132E52;
  --color-navy-light: #2A5298;
  --color-gold:       #C9A227;
  --color-gold-light: #F0C040;
  --color-gold-dark:  #B8911F;
  --color-gold-bg:    #FEF9EC;
  --color-charcoal:   #2D3748;
  --color-gray-700:   #4A5568;
  --color-gray-500:   #718096;
  --color-gray-300:   #CBD5E0;
  --color-bg:         #F7F9FC;
  --color-white:      #FFFFFF;
  --color-border:     #E2E8F0;
  --color-code-bg:    #1E2A3A;
  --color-code-text:  #E2E8F0;
  --color-teal:       #2A9D8F;

  /* Badge colors */
  --badge-research:   #2A5298;
  --badge-plan:       #553C9A;
  --badge-report:     #B7791F;
  --badge-code:       #276749;
  --badge-analysis:   #2C7A7B;
  --badge-template:   #2D3748;

  /* Fonts */
  --font-heading: 'Raleway', 'Segoe UI', system-ui, sans-serif;
  --font-body:    'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  80px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.07);
  --shadow-lg:  0 10px 28px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.08);

  /* Transitions */
  --transition: 200ms ease;

  /* Nav height */
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-charcoal);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

ul, ol { list-style: none; }

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

/* ── Layout ───────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* ── Navigation ───────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-navy);
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
}

.nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-logo-name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-logo-name span {
  color: var(--color-gold);
}

.nav-logo-tagline {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  color: rgba(255,255,255,0.55);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.82);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-gold);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-2);
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.8);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Hero Section ─────────────────────────────────────────── */
.hero {
  background: var(--color-navy);
  min-height: 480px;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 45%;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.03) 100%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-gold-light) 50%, transparent 100%);
}

.hero-content {
  padding: var(--space-9) 0;
  max-width: 680px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  color: var(--color-gold);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.hero-eyebrow::before {
  content: '';
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-gold);
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: var(--space-4);
}

.hero h1 span {
  color: var(--color-gold);
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: 17px;
  color: rgba(255,255,255,0.70);
  line-height: 1.65;
  margin-bottom: var(--space-6);
  max-width: 520px;
}

.hero-stats {
  display: flex;
  gap: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.12);
}

.hero-stat-value {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 800;
  color: var(--color-gold);
  line-height: 1;
}

.hero-stat-label {
  font-size: 11px;
  font-weight: 500;
  color: rgba(255,255,255,0.50);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-top: 4px;
}

/* ── Sections ─────────────────────────────────────────────── */
.section {
  padding: var(--space-9) 0;
}

.section-header {
  margin-bottom: var(--space-7);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-charcoal);
  padding-left: var(--space-4);
  border-left: 4px solid var(--color-gold);
  line-height: 1.2;
}

.section-subtitle {
  font-size: 15px;
  color: var(--color-gray-500);
  margin-top: var(--space-2);
  padding-left: calc(var(--space-4) + 4px);
}

/* ── Card Grid ────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

/* ── Card Component ───────────────────────────────────────── */
.card {
  background: var(--color-white);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
  border-top: 3px solid var(--color-border);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--color-gold);
}

.card-body {
  padding: var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
  align-self: flex-start;
}

.card-badge.research  { background: rgba(42,82,152,0.12); color: var(--badge-research); }
.card-badge.plan      { background: rgba(85,60,154,0.12); color: var(--badge-plan); }
.card-badge.report    { background: rgba(183,121,31,0.12); color: var(--badge-report); }
.card-badge.code      { background: rgba(39,103,73,0.12); color: var(--badge-code); }
.card-badge.analysis  { background: rgba(44,122,123,0.12); color: var(--badge-analysis); }
.card-badge.template  { background: rgba(45,55,72,0.10); color: var(--badge-template); }

.card-title {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-charcoal);
  line-height: 1.3;
  margin-bottom: var(--space-2);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 11px;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.card-meta-sep {
  color: var(--color-gray-300);
}

.card-description {
  font-size: 14px;
  color: var(--color-gray-700);
  line-height: 1.65;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.card-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-gold);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: color var(--transition);
}

.card-link:hover {
  color: var(--color-navy);
}

.card-link::after {
  content: '→';
  display: inline-block;
  transition: transform var(--transition);
}

.card-link:hover::after {
  transform: translateX(4px);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 24px;
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
}

.btn-primary:hover {
  background: var(--color-navy-dark);
  border-color: var(--color-navy-dark);
  color: var(--color-white);
}

.btn-outlined {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-navy);
}

.btn-outlined:hover {
  background: var(--color-navy);
  color: var(--color-white);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-white);
  border-color: var(--color-gold);
}

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

/* ── Content / Deliverable Pages ─────────────────────────── */

/* Badge in page-header context needs slightly more bottom spacing */
.page-header .card-badge {
  margin-bottom: var(--space-4);
}

.page-header {
  background: var(--color-navy);
  padding-top: var(--nav-height);
  padding-bottom: var(--space-7);
  position: relative;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 60%);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 12px;
  font-weight: 500;
  color: rgba(255,255,255,0.50);
  margin-bottom: var(--space-4);
  padding-top: var(--space-5);
  letter-spacing: 0.3px;
}

.breadcrumb a {
  color: rgba(255,255,255,0.50);
}

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

.breadcrumb-sep {
  color: rgba(255,255,255,0.25);
  font-size: 14px;
}

.breadcrumb-current {
  color: rgba(255,255,255,0.80);
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.15;
  max-width: 700px;
  margin-bottom: var(--space-4);
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  font-size: 13px;
  color: rgba(255,255,255,0.55);
}

.page-meta-sep {
  color: rgba(255,255,255,0.20);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-gold);
  margin-top: var(--space-5);
  transition: color var(--transition);
}

.back-link:hover {
  color: var(--color-gold-light);
}

.back-link::before {
  content: '←';
  display: inline-block;
  transition: transform var(--transition);
}

.back-link:hover::before {
  transform: translateX(-4px);
}

/* ── Content Layout ───────────────────────────────────────── */
.content-layout {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-5);
}

.content-layout h1 {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-charcoal);
  line-height: 1.2;
  margin-bottom: var(--space-5);
}

.content-layout h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  border-bottom: 2px solid var(--color-gold);
  padding-bottom: var(--space-2);
  margin-top: var(--space-8);
  margin-bottom: var(--space-5);
  line-height: 1.25;
}

.content-layout h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.content-layout p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-charcoal);
  margin-bottom: var(--space-5);
}

.content-layout ul,
.content-layout ol {
  padding-left: var(--space-5);
  margin-bottom: var(--space-5);
}

.content-layout ul { list-style: disc; }
.content-layout ol { list-style: decimal; }

.content-layout li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-charcoal);
  margin-bottom: var(--space-2);
}

.content-layout code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 2px 7px;
  border-radius: 3px;
}

.content-layout pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: var(--space-5) var(--space-5);
  border-radius: 6px;
  overflow-x: auto;
  border-left: 4px solid var(--color-gold);
  font-size: 13.5px;
  line-height: 1.6;
  margin-bottom: var(--space-5);
}

.content-layout pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

.content-layout table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-5);
  font-size: 14px;
}

.content-layout th {
  background: var(--color-navy);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 12px 16px;
  text-align: left;
}

.content-layout td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-charcoal);
  line-height: 1.5;
}

.content-layout tr:nth-child(even) td {
  background: var(--color-bg);
}

.content-layout tr:hover td {
  background: var(--color-gold-bg);
}

.content-layout blockquote {
  border-left: 4px solid var(--color-gold);
  background: var(--color-gold-bg);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-5) 0;
  border-radius: 0 6px 6px 0;
  font-style: italic;
  color: var(--color-gray-700);
  font-size: 15px;
  line-height: 1.7;
}

.content-layout hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-7) 0;
}

.content-layout a {
  color: var(--color-navy-light);
  text-decoration: underline;
  text-decoration-color: var(--color-gold);
  text-underline-offset: 2px;
}

.content-layout a:hover {
  color: var(--color-gold);
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.70);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  padding-bottom: 50px;
}

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

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.footer-brand-name span {
  color: var(--color-gold);
}

.footer-brand-desc {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(255,255,255,0.50);
  max-width: 220px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: var(--space-4);
}

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

.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.60);
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.10);
  padding: var(--space-5) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 12px;
  color: rgba(255,255,255,0.35);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-5);
}

.footer-bottom-links a {
  color: rgba(255,255,255,0.35);
  transition: color var(--transition);
  font-size: 12px;
}

.footer-bottom-links a:hover {
  color: var(--color-gold);
}

/* ── Category Cards ──────────────────────────────────────── */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

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

@media (min-width: 1100px) {
  .category-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.cat-card {
  background: var(--color-white);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  padding: var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  border-top: 4px solid var(--color-navy);
  transition: transform var(--transition), box-shadow var(--transition), border-top-color var(--transition);
  text-decoration: none;
  color: inherit;
}

.cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--color-gold);
}

.cat-card-title {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-bottom: var(--space-2);
}

.cat-card-desc {
  font-size: 13px;
  color: var(--color-gray-500);
  line-height: 1.6;
  flex: 1;
  margin-bottom: var(--space-4);
}

.cat-card-cta {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.cat-card-cta::after {
  content: '→';
  display: inline-block;
  transition: transform var(--transition);
}

.cat-card:hover .cat-card-cta::after {
  transform: translateX(4px);
}

/* ── Pillar Grid (OpEx Framework) ─────────────────────────── */
.pillar-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

@media (min-width: 768px) {
  .pillar-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.pillar-card {
  background: var(--color-white);
  border-radius: 8px;
  padding: var(--space-5);
  border-top: 4px solid var(--color-navy);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.pillar-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-top-color: var(--color-gold);
}

.pillar-card h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
  margin-top: 0;
}

.pillar-card .pillar-subtitle {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-3);
}

.pillar-card p {
  font-size: 14px;
  color: var(--color-gray-700);
  line-height: 1.65;
  margin-bottom: var(--space-3);
}

.pillar-card ul {
  padding-left: var(--space-4);
  list-style: disc;
}

.pillar-card li {
  font-size: 13px;
  color: var(--color-gray-700);
  line-height: 1.6;
  margin-bottom: var(--space-1);
}

/* ── Layer Diagram (OpEx 3-layer model) ──────────────────── */
.layer-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.layer-block {
  background: var(--color-white);
  border-radius: 8px;
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border-left: 5px solid var(--color-navy);
  position: relative;
}

.layer-block.layer-3 { border-left-color: var(--color-navy); }
.layer-block.layer-2 { border-left-color: var(--color-gold); }
.layer-block.layer-1 { border-left-color: var(--color-teal); }

.layer-block .layer-label {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-flex;
  margin-bottom: var(--space-3);
}

.layer-block.layer-3 .layer-label { background: var(--color-navy); }
.layer-block.layer-2 .layer-label { background: var(--color-gold-dark); }
.layer-block.layer-1 .layer-label { background: var(--color-teal); }

.layer-block h3 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-bottom: var(--space-2);
  margin-top: 0;
}

.layer-block .layer-focus {
  font-size: 13px;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

.layer-block .layer-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.layer-block .layer-item {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--color-bg);
  color: var(--color-charcoal);
  border: 1px solid var(--color-border);
}

/* ── Phase Timeline (Roadmap) ────────────────────────────── */
.phase-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

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

.phase-card {
  background: var(--color-white);
  border-radius: 8px;
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border-top: 4px solid var(--color-gold);
  position: relative;
}

.phase-card .phase-number {
  font-family: var(--font-heading);
  font-size: 36px;
  font-weight: 800;
  color: var(--color-gold);
  opacity: 0.2;
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  line-height: 1;
}

.phase-card h3 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
  margin-top: 0;
}

.phase-card .phase-timing {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-3);
}

.phase-card ul {
  padding-left: var(--space-4);
  list-style: disc;
}

.phase-card li {
  font-size: 13px;
  color: var(--color-gray-700);
  line-height: 1.6;
  margin-bottom: var(--space-1);
}

/* ── Tech Tags (AI Use Cases) ────────────────────────────── */
.tech-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  font-family: var(--font-mono);
}

.tech-tag.genai    { background: rgba(85,60,154,0.12); color: #553C9A; }
.tech-tag.agentic  { background: rgba(183,121,31,0.12); color: #B7791F; }
.tech-tag.cv       { background: rgba(39,103,73,0.12); color: #276749; }
.tech-tag.ml       { background: rgba(42,82,152,0.12); color: #2A5298; }
.tech-tag.robotics { background: rgba(44,122,123,0.12); color: #2C7A7B; }

/* ── Utilities ────────────────────────────────────────────── */
.text-gold  { color: var(--color-gold); }
.text-navy  { color: var(--color-navy); }
.text-muted { color: var(--color-gray-500); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-5) 0;
}

/* ── Responsive Nav ───────────────────────────────────────── */
@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-navy-dark);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-5);
    gap: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 250ms ease, opacity 250ms ease;
  }

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

  .hero-stats {
    gap: var(--space-5);
  }
}