/* RunForge Design System — Bright Light Palette
   Athletic app aesthetic (Strava / Nike Run Club light mode)
   All colors via CSS variables; no hardcoded color values in components */

:root {
  /* Color tokens */
  --bg: #FAFAFA;
  --bg-2: #FFFFFF;
  --bg-3: #F2F2F2;
  --fg: #1A1A1A;
  --fg-muted: #6B7280;
  --accent: #FF5522;
  --accent-hover: #E64B1C;
  --accent-dim: rgba(255, 85, 34, 0.08);
  --accent-border: rgba(255, 85, 34, 0.25);
  --border: #E5E7EB;
  --border-strong: #D1D5DB;
  --surface: #FFFFFF;
  --surface-hover: #F9FAFB;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  /* Typography */
  --font-display: 'Bebas Neue', 'Arial Black', sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 16px 40px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #fff; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-3); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--fg-muted); }

/* ─── Navigation ───────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(250,250,250,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-tagline {
  font-size: 13px;
  color: var(--fg-muted);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover { color: var(--fg); background: var(--bg-3); }

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: background 0.2s, transform 0.1s;
}
.nav-cta:hover { background: var(--accent-hover); }
.nav-cta:active { transform: scale(0.98); }

.nav-spacer { flex: 1; }

/* ─── Hero CTA group ─────────────────────────────────────────── */

.hero-cta-group {
  margin-top: var(--space-10);
  display: flex;
  gap: var(--space-5);
  align-items: center;
  flex-wrap: wrap;
}

/* ─── Hero ────────────────────────────────────────────────────── */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--bg);
}

.hero-glow {
  position: absolute;
  top: -15%;
  right: -8%;
  width: 65vw;
  height: 65vw;
  background: radial-gradient(circle at center, rgba(255,85,34,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px var(--space-8) var(--space-16);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
  width: 100%;
}

.hero-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-5);
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(52px, 6vw, 84px);
  line-height: 0.95;
  letter-spacing: 0.02em;
  color: var(--fg);
  margin-bottom: var(--space-6);
}

.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 440px;
  line-height: 1.65;
  font-weight: 400;
}

.hero-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--accent);
  color: #fff;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px rgba(255,85,34,0.3);
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
}
.hero-cta-btn:hover { background: var(--accent-hover); box-shadow: 0 6px 20px rgba(255,85,34,0.35); }
.hero-cta-btn:active { transform: scale(0.98); }

/* Route mockup card */
.hero-visual { display: flex; justify-content: flex-end; }

.route-mockup {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.mockup-header {
  display: flex;
  gap: 7px;
  padding: 14px 16px;
  background: var(--bg-3);
  border-bottom: 1px solid var(--border);
}

.mockup-dot { width: 12px; height: 12px; border-radius: 50%; }
.mockup-dot.red { background: #FF5F57; }
.mockup-dot.yellow { background: #FFBD2E; }
.mockup-dot.green { background: #28CA41; }

.mockup-map { padding: var(--space-6); background: var(--bg); }
.mockup-map svg { width: 100%; height: auto; display: block; }

.mockup-input {
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--border);
  background: var(--surface);
}

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

.input-field {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
}
.input-field.primary { border-color: var(--accent); background: var(--accent-dim); }

.input-label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 3px;
}

.input-value { display: block; font-size: 16px; font-weight: 600; color: var(--fg); }
.input-unit { color: var(--fg-muted); font-weight: 400; }

/* ─── How section ──────────────────────────────────────────────── */

.how {
  padding: var(--space-16) var(--space-8);
  border-top: 1px solid var(--border);
  background: var(--bg);
}

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

.how-header { text-align: center; margin-bottom: var(--space-16); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 56px);
  letter-spacing: 0.03em;
  margin-bottom: var(--space-5);
}

.section-sub {
  font-size: 17px;
  color: var(--fg-muted);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.65;
}

.steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: start;
}

.step { padding: 0 var(--space-8); }

.step-num {
  font-family: var(--font-display);
  font-size: 56px;
  color: var(--accent);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-4);
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.step-body {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.65;
}

.step-divider {
  width: 1px;
  height: 120px;
  background: var(--border);
  margin-top: 16px;
}

/* ─── Features ─────────────────────────────────────────────────── */

.features {
  padding: var(--space-12) var(--space-8);
  background: var(--bg-3);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

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

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  margin-bottom: 2px;
}

.feature-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  box-shadow: var(--shadow-card);
}

.feature-icon { margin-bottom: var(--space-5); }

.feature-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.feature-body {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ─── Routes (cards) ────────────────────────────────────────────── */

.routes {
  padding: var(--space-16) var(--space-8);
}

.routes-inner { max-width: 1200px; margin: 0 auto; }
.routes-header { text-align: center; margin-bottom: var(--space-12); }

.route-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

.route-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.route-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.2s;
}

.route-card:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.route-card:hover::before { opacity: 1; }

.route-distance {
  font-family: var(--font-display);
  font-size: 36px;
  color: var(--accent);
  line-height: 1;
  margin-bottom: var(--space-4);
}

.route-details { display: flex; flex-direction: column; gap: var(--space-2); }
.route-label { font-size: 13px; font-weight: 600; color: var(--fg); }
.route-desc { font-size: 13px; color: var(--fg-muted); line-height: 1.5; }

/* ─── Closing CTA ──────────────────────────────────────────────── */

.closing {
  padding: var(--space-16) var(--space-8);
  border-top: 1px solid var(--border);
  text-align: center;
}

.closing-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.closing-bg {
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse 60% 80% at 50% 50%, rgba(255,85,34,0.05) 0%, transparent 70%);
  pointer-events: none;
}

.closing-statement {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 48px);
  line-height: 1.2;
  letter-spacing: 0.03em;
  position: relative;
}

/* ─── Footer ───────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-10) var(--space-8);
  background: var(--bg);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.footer-copy { font-size: 13px; color: var(--fg-muted); }

/* ─── Shared Button Styles ─────────────────────────────────────── */

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-7);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.01em;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: var(--surface);
  color: var(--fg);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

/* ─── Responsive ──────────────────────────────────────────────── */

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 90px; gap: var(--space-10); }
  .hero-visual { justify-content: center; }
  .route-mockup { max-width: 100%; }
  .steps { grid-template-columns: 1fr; gap: var(--space-10); }
  .step-divider { display: none; }
  .feature-row { grid-template-columns: 1fr; }
  .route-cards { grid-template-columns: 1fr 1fr; }
  .nav-inner { padding: var(--space-4) var(--space-5); }
}

@media (max-width: 600px) {
  .route-cards { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: var(--space-4); text-align: center; }
  .hero-headline { font-size: 44px; }
  .how, .routes, .closing { padding: var(--space-12) var(--space-5); }
  .features { padding: var(--space-10) var(--space-5); }
}