/* ═══════════════════════════════════════════════════════════════
   KD Express — Landing Page Stylesheet
   Palette: KD Blue #0F4DA8 · KD Yellow #FFC72C · Cream #F4F1EA
            Navy #082558 · Charcoal #222
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;600&display=swap');

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

:root {
  --kd-blue:    #0F4DA8;
  --kd-yellow:  #FFC72C;
  --kd-cream:   #F4F1EA;
  --kd-navy:    #082558;
  --kd-charcoal:#222;
  --kd-light:   #e8f0fb;
  --radius:     12px;
  --radius-lg:  20px;
  --shadow-sm:  0 2px 8px rgba(0,0,0,0.12);
  --shadow-md:  0 8px 32px rgba(0,0,0,0.18);
  --shadow-lg:  0 20px 60px rgba(0,0,0,0.25);
  --transition: 0.25s cubic-bezier(0.2,0.8,0.2,1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--kd-cream);
  color: var(--kd-charcoal);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.15;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--kd-yellow);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: #555;
  max-width: 56ch;
  line-height: 1.6;
}

/* ── CTA Button ─────────────────────────────────────────────── */
.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--kd-yellow);
  color: var(--kd-navy);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 16px 36px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(255,199,44,0.4);
}

.btn-cta:hover {
  background: #ffd45a;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255,199,44,0.55);
}

.btn-cta:active {
  transform: translateY(0);
}

.btn-cta-lg {
  font-size: 1.2rem;
  padding: 20px 48px;
  border-radius: 10px;
}

.btn-cta-sm {
  font-size: 0.875rem;
  padding: 10px 22px;
}

/* ── Sticky Nav ─────────────────────────────────────────────── */
#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
  height: 64px;
  background: rgba(8, 37, 88, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,199,44,0.15);
  transition: background var(--transition);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
}

.topbar-logo-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.topbar-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.topbar-brand-main {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.02em;
}

.topbar-brand-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--kd-yellow);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 2px;
}

.topbar-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.topbar-nav a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.topbar-nav a:hover {
  color: #fff;
}

@media (max-width: 640px) {
  .topbar-nav .nav-links { display: none; }
}

/* ── Hero ───────────────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 70% 60% at 50% 40%, #1a5fcc 0%, var(--kd-blue) 55%, var(--kd-navy) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px clamp(1rem, 6vw, 4rem) 80px;
  position: relative;
  overflow: hidden;
}

/* chevron wave pattern */
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      135deg,
      transparent 0px,
      transparent 28px,
      rgba(255,199,44,0.055) 28px,
      rgba(255,199,44,0.055) 32px
    );
  pointer-events: none;
}

/* KD wave decoration bottom */
#hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--kd-cream);
  clip-path: ellipse(55% 100% at 50% 100%);
}

.hero-kicker {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--kd-yellow);
  background: rgba(255,199,44,0.12);
  border: 1px solid rgba(255,199,44,0.3);
  border-radius: 100px;
  padding: 6px 18px;
  margin-bottom: 2rem;
  display: inline-block;
}

.hero-title {
  font-size: clamp(3.5rem, 10vw, 8rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 0.95;
  text-shadow: 0 4px 32px rgba(0,0,0,0.4);
  margin-bottom: 1.25rem;
}

.hero-title span {
  color: var(--kd-yellow);
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  margin-bottom: 0.75rem;
  max-width: 52ch;
}

.hero-tagline {
  font-size: clamp(0.9rem, 1.8vw, 1.15rem);
  color: rgba(255,255,255,0.65);
  margin-bottom: 3rem;
  max-width: 46ch;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 4rem;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.12);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  padding: 16px 32px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.2);
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  justify-content: center;
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.hero-stat strong {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--kd-yellow);
  line-height: 1;
}

.scroll-hint {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: rgba(255,255,255,0.5);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  animation: bounce-hint 2s ease-in-out infinite;
  z-index: 2;
}

.scroll-hint svg {
  animation: bounce-arrow 2s ease-in-out infinite;
}

@keyframes bounce-hint {
  0%, 100% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
  50%       { opacity: 1;   transform: translateX(-50%) translateY(6px); }
}

@keyframes bounce-arrow {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(4px); }
}

/* ── Section Wrapper ────────────────────────────────────────── */
.section {
  padding: clamp(60px, 10vw, 120px) clamp(1rem, 6vw, 4rem);
}

.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-center {
  text-align: center;
}

.section-center .section-subtitle {
  margin: 0 auto;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* ── Features Grid ──────────────────────────────────────────── */
#features {
  background: var(--kd-cream);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .features-grid { grid-template-columns: 1fr; }
}

.feature-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  border: 1px solid rgba(15,77,168,0.08);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(24px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(15,77,168,0.15);
}

.feature-card.visible:hover {
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 2.4rem;
  line-height: 1;
  margin-bottom: 1rem;
  display: block;
}

.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--kd-navy);
  margin-bottom: 0.5rem;
}

.feature-desc {
  font-size: 0.9rem;
  color: #555;
  line-height: 1.6;
}

/* ── Audience Section ───────────────────────────────────────── */
#audience {
  background: var(--kd-navy);
  color: #fff;
}

#audience .section-title {
  color: #fff;
}

#audience .section-subtitle {
  color: rgba(255,255,255,0.7);
}

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

@media (max-width: 700px) {
  .audience-grid { grid-template-columns: 1fr; }
}

.audience-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: var(--transition);
}

.audience-card:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-3px);
}

.audience-icon {
  font-size: 3rem;
  margin-bottom: 1.25rem;
  display: block;
}

.audience-card h3 {
  font-size: 1.4rem;
  color: var(--kd-yellow);
  margin-bottom: 1.25rem;
}

.audience-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.audience-card ul li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
  line-height: 1.5;
}

.audience-card ul li::before {
  content: '▸';
  color: var(--kd-yellow);
  flex-shrink: 0;
  margin-top: 0.05em;
}

/* ── Scene Gallery ──────────────────────────────────────────── */
#gallery {
  background: #fff;
  overflow: hidden;
}

.gallery-scroll {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 0 2rem;
  scrollbar-width: thin;
  scrollbar-color: var(--kd-yellow) transparent;
}

.gallery-scroll::-webkit-scrollbar {
  height: 4px;
}

.gallery-scroll::-webkit-scrollbar-thumb {
  background: var(--kd-yellow);
  border-radius: 2px;
}

.scene-item {
  flex: 0 0 320px;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.scene-item svg {
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  display: block;
  transition: var(--transition);
}

.scene-item:hover svg {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.scene-caption {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--kd-navy);
  text-align: center;
  padding: 0 0.5rem;
}

.gallery-hint {
  text-align: center;
  font-size: 0.8rem;
  color: #999;
  margin-top: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Tech Stats ─────────────────────────────────────────────── */
#tech {
  background: var(--kd-blue);
  color: #fff;
}

#tech .section-title {
  color: #fff;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

@media (max-width: 900px) {
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .tech-grid { grid-template-columns: 1fr; }
}

.tech-stat {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.tech-stat:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-3px);
}

.tech-stat-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--kd-yellow);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.tech-stat-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: 0.4rem;
}

.tech-stat-desc {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.5;
}

.tech-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2.5rem;
}

.tech-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  color: rgba(255,255,255,0.8);
  border-radius: 4px;
  padding: 4px 10px;
  letter-spacing: 0.05em;
}

/* ── Routes ─────────────────────────────────────────────────── */
#routes {
  background: var(--kd-cream);
}

.routes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .routes-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .routes-grid { grid-template-columns: 1fr; }
}

.route-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  border: 1px solid rgba(15,77,168,0.1);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  position: relative;
  overflow: hidden;
}

.route-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--kd-yellow);
}

.route-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.route-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--kd-blue);
}

.route-card.visible:hover {
  transform: translateY(-5px);
}

.route-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.route-name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--kd-navy);
  margin-bottom: 1rem;
  line-height: 1.3;
}

.route-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.route-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--kd-light);
  color: var(--kd-blue);
  border-radius: 100px;
  padding: 3px 10px;
  letter-spacing: 0.04em;
}

.route-cities {
  font-size: 0.82rem;
  color: #666;
  line-height: 1.6;
}

.route-cities strong {
  color: var(--kd-navy);
  font-weight: 600;
}

/* ── Footer ─────────────────────────────────────────────────── */
#footer {
  background: var(--kd-navy);
  color: rgba(255,255,255,0.8);
  padding: clamp(3rem, 6vw, 5rem) clamp(1rem, 6vw, 4rem);
  text-align: center;
}

.footer-cta {
  margin-bottom: 3rem;
}

.footer-cta p {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1.5rem;
}

.footer-divider {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.12);
  margin: 2.5rem auto;
  max-width: 400px;
}

.footer-credits {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-author {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

.footer-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--kd-yellow);
}

.footer-ack {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  margin-top: 0.25rem;
}

.footer-tech {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.35);
  margin-top: 1rem;
}

/* ── Scroll-reveal animation ────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.feature-card:nth-child(1)  { transition-delay: 0.05s; }
.feature-card:nth-child(2)  { transition-delay: 0.10s; }
.feature-card:nth-child(3)  { transition-delay: 0.15s; }
.feature-card:nth-child(4)  { transition-delay: 0.20s; }
.feature-card:nth-child(5)  { transition-delay: 0.25s; }
.feature-card:nth-child(6)  { transition-delay: 0.30s; }
.feature-card:nth-child(7)  { transition-delay: 0.05s; }
.feature-card:nth-child(8)  { transition-delay: 0.10s; }
.feature-card:nth-child(9)  { transition-delay: 0.15s; }
.feature-card:nth-child(10) { transition-delay: 0.20s; }
.feature-card:nth-child(11) { transition-delay: 0.25s; }
.feature-card:nth-child(12) { transition-delay: 0.30s; }
.feature-card:nth-child(13) { transition-delay: 0.05s; }
.feature-card:nth-child(14) { transition-delay: 0.10s; }
.feature-card:nth-child(15) { transition-delay: 0.15s; }

.route-card:nth-child(1) { transition-delay: 0.05s; }
.route-card:nth-child(2) { transition-delay: 0.12s; }
.route-card:nth-child(3) { transition-delay: 0.19s; }
.route-card:nth-child(4) { transition-delay: 0.05s; }
.route-card:nth-child(5) { transition-delay: 0.12s; }

/* ── Utility ─────────────────────────────────────────────────── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}

.highlight {
  color: var(--kd-yellow);
}

@media (prefers-reduced-motion: reduce) {
  *, .feature-card, .route-card, .reveal {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}