/* ═══════════════════════════════════════════
   ExerGen — Gym Workout App Theme
   ═══════════════════════════════════════════ */

:root {
  --bg:          #0c0c0c;
  --bg-elevated: #161616;
  --card:        #1c1c1c;
  --card-hover:  #242424;
  --text:        #f0f0f0;
  --text-muted:  #999;
  --primary:     #ff5722;
  --primary-dim: #d84315;
  --accent:      #ffab00;
  --green:       #66bb6a;
  --radius:      12px;
  --radius-sm:   8px;
  --shadow:      0 4px 24px rgba(0,0,0,.5);
  --shadow-hover:0 8px 32px rgba(255,87,34,.15);
  --font-display:'Bebas Neue', sans-serif;
  --font-body:   'Inter', system-ui, sans-serif;
  --max-w:       1200px;
  --header-h:    64px;
}

*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body { font-family: var(--font-body); background: var(--bg); color: var(--text); line-height: 1.65; -webkit-font-smoothing: antialiased; }

/* ─── HEADER ─── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(12,12,12,.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  height: var(--header-h);
}
.header-inner { max-width: var(--max-w); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 100%; padding: 0 24px; }
.brand-mark { font-family: var(--font-display); font-size: 1.8rem; letter-spacing: 2px; color: var(--text); text-decoration: none; }
.brand-mark span { color: var(--primary); }
.main-nav { display: flex; gap: 6px; }
.main-nav a { color: var(--text-muted); text-decoration: none; font-size: .88rem; font-weight: 500; padding: 6px 14px; border-radius: 20px; transition: color .2s, background .2s; }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--text); background: rgba(255,255,255,.08); }
.menu-btn { display: none; background: none; border: none; color: var(--text); font-size: 1.5rem; cursor: pointer; padding: 8px; }

/* ─── HERO ─── */
.hero {
  min-height: calc(100vh - var(--header-h));
  display: flex; align-items: center;
  background: linear-gradient(135deg, #0c0c0c 0%, #1a0a00 50%, #0c0c0c 100%);
  padding: 80px 24px;
}
.hero-inner { max-width: var(--max-w); margin: 0 auto; display: grid; grid-template-columns: 1fr 340px; gap: 64px; align-items: center; width: 100%; }
.hero-tag { font-size: .85rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 3px; margin-bottom: 16px; }
.hero h1 { font-family: var(--font-display); font-size: clamp(3rem,7vw,5.5rem); line-height: 1; letter-spacing: 1px; margin-bottom: 24px; }
.hero-sub { font-size: 1.15rem; color: var(--text-muted); max-width: 520px; margin-bottom: 36px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn { display: inline-block; font-weight: 600; font-size: .95rem; padding: 14px 32px; border-radius: 30px; text-decoration: none; transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer; }
.btn-primary { background: var(--primary); color: #fff; border: none; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(255,87,34,.4); }
.btn-outline { background: transparent; color: var(--text); border: 2px solid rgba(255,255,255,.2); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.hero-card {
  background: var(--card); border-radius: var(--radius); padding: 40px 32px; text-align: center;
  border: 1px solid rgba(255,87,34,.15); box-shadow: var(--shadow);
}
.hero-card-label { font-size: .8rem; text-transform: uppercase; letter-spacing: 2px; color: var(--primary); margin-bottom: 8px; }
.hero-card-stat { font-family: var(--font-display); font-size: 5rem; line-height: 1; color: var(--accent); }
.hero-card-desc { color: var(--text-muted); font-size: .9rem; margin-top: 12px; }

/* ─── SECTIONS ─── */
.section { padding: 96px 24px; }
.section h2 {
  font-family: var(--font-display); font-size: clamp(2rem,4vw,3rem);
  letter-spacing: 1px; text-align: center; margin-bottom: 56px; position: relative;
}
.section h2::after {
  content: ''; display: block; width: 60px; height: 4px; margin: 16px auto 0;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
}
.section-dark { background: var(--bg-elevated); }

/* ─── CARDS ─── */
.card {
  background: var(--card); border-radius: var(--radius); padding: 32px;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(255,87,34,.2); }
.card h3 { font-family: var(--font-display); font-size: 1.4rem; letter-spacing: .5px; color: var(--primary); margin-bottom: 12px; }
.card ul { padding-left: 20px; color: var(--text-muted); }
.card li { margin-bottom: 6px; }
.overview-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(300px,1fr)); gap: 24px; max-width: var(--max-w); margin: 0 auto; }

/* ─── FEATURES ─── */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 28px; max-width: var(--max-w); margin: 0 auto; }
.feature-item {
  background: var(--card); border-radius: var(--radius); padding: 36px 28px; text-align: center;
  border: 1px solid rgba(255,255,255,.06);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.feature-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(255,87,34,.2); }
.feature-icon { font-size: 2.4rem; margin-bottom: 16px; }
.feature-item h3 { font-family: var(--font-display); font-size: 1.3rem; letter-spacing: .5px; color: var(--accent); margin-bottom: 10px; }
.feature-item p { color: var(--text-muted); font-size: .92rem; }

/* ─── DEMO ─── */
.demo-container { max-width: 600px; margin: 0 auto; }
.video-placeholder {
  background: var(--card); border-radius: var(--radius); border: 2px dashed rgba(255,87,34,.3);
  aspect-ratio: 9/16; display: flex; align-items: center; justify-content: center;
}
.video-placeholder-inner { text-align: center; padding: 32px; }
.video-placeholder-icon { font-size: 2.5rem; color: var(--primary); margin-bottom: 6px; }
.video-placeholder-text { font-family: var(--font-display); font-size: 0.95rem; color: var(--text); margin-bottom: 2px; letter-spacing: 0.5px; }
.video-placeholder-hint { font-size: .75rem; color: var(--text-muted); }
.video-placeholder-hint code { background: rgba(255,255,255,.08); padding: 2px 6px; border-radius: 4px; font-size: .75rem; }

/* ─── SCREENSHOTS ─── */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  max-width: 1600px;
  margin: 0 auto;
  justify-content: center;
  padding: 0 40px;
}

.screenshot-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px 16px;
  border: 1px solid rgba(255,255,255,.04);
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  align-items: center;
}

.screenshot-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 1px;
  color: var(--primary);
  margin-bottom: 20px;
  text-align: center;
  text-transform: uppercase;
  opacity: 0.9;
}

.screenshot-card img {
  height: 600px; /* Larger images */
  width: auto;
  max-width: 100%;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 15px 35px rgba(0,0,0,0.6);
  transition: transform .4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.screenshot-card:hover {
  border-color: rgba(255,87,34,0.4);
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.screenshot-card:hover img {
  transform: scale(1.03);
}

/* Responsive adjustments for 5/5 layout */
@media (max-width: 1400px) {
  .screenshot-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    padding: 0 24px;
  }
  .screenshot-card img {
    height: 540px;
  }
}

@media (max-width: 900px) {
  .screenshot-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .screenshot-card img {
    height: 480px;
  }
}

@media (max-width: 500px) {
  .screenshot-grid {
    grid-template-columns: 1fr;
  }
  .screenshot-card img {
    height: auto;
    width: 100%;
    max-width: 300px;
  }
}

/* ─── ARCHITECTURE ─── */
.arch-layout { display: grid; grid-template-columns: 320px 1fr; gap: 48px; max-width: var(--max-w); margin: 0 auto; align-items: start; }
.arch-layers { display: flex; flex-direction: column; gap: 0; }
.layer {
  padding: 20px 24px; border-radius: var(--radius-sm); text-align: center;
  border: 1px solid rgba(255,255,255,.08);
}
.layer h4 { font-family: var(--font-display); font-size: 1.1rem; letter-spacing: 1px; margin-bottom: 4px; }
.layer p { font-size: .82rem; color: var(--text-muted); }
.layer-presentation { background: linear-gradient(135deg, #1b2735, #0d1b2a); border-color: rgba(100,181,246,.2); }
.layer-presentation h4 { color: #64b5f6; }
.layer-business { background: linear-gradient(135deg, #1a2e1a, #0d1f0d); border-color: rgba(102,187,106,.2); }
.layer-business h4 { color: var(--green); }
.layer-persistence { background: linear-gradient(135deg, #2e2a1a, #1f1a0d); border-color: rgba(255,171,0,.2); }
.layer-persistence h4 { color: var(--accent); }
.layer-application { background: linear-gradient(135deg, #2e1a1a, #1f0d0d); border-color: rgba(255,87,34,.2); }
.layer-application h4 { color: var(--primary); }
.layer-arrow { text-align: center; font-size: 1.4rem; color: var(--text-muted); padding: 4px 0; }
.arch-evidence { background: var(--card); border-radius: var(--radius); padding: 32px; border: 1px solid rgba(255,255,255,.06); }
.arch-evidence h3 { font-family: var(--font-display); font-size: 1.3rem; color: var(--primary); margin-bottom: 16px; }
.arch-evidence ul { padding-left: 20px; }
.arch-evidence li { color: var(--text-muted); margin-bottom: 10px; line-height: 1.5; }
.arch-evidence code { background: rgba(255,255,255,.08); padding: 2px 6px; border-radius: 4px; font-size: .82rem; }

/* ─── POSTMORTEM ─── */
.postmortem-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: var(--max-w);
  margin: 0 auto;
}

@media (max-width: 1100px) {
  .postmortem-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.postmortem-extra { max-width: var(--max-w); margin: 48px auto 0; }
.postmortem-extra h3 { font-family: var(--font-display); font-size: 1.5rem; text-align: center; margin-bottom: 28px; color: var(--accent); }
.metrics-table { width: 100%; margin-top: 12px; }
.metrics-table td { padding: 8px 12px; border-bottom: 1px solid rgba(255,255,255,.06); }
.metrics-table td:first-child { color: var(--text-muted); }
.metrics-table td:last-child { text-align: right; color: var(--green); }

/* ─── TEAM TABLE ─── */
.contrib-table { max-width: var(--max-w); margin: 0 auto; width: 100%; border-collapse: collapse; }
.contrib-table th { font-family: var(--font-display); font-size: 1rem; letter-spacing: .5px; text-align: left; padding: 14px 16px; border-bottom: 2px solid var(--primary); color: var(--primary); }
.contrib-table td { padding: 14px 16px; border-bottom: 1px solid rgba(255,255,255,.06); color: var(--text-muted); font-size: .92rem; }
.contrib-table tr:hover td { background: rgba(255,87,34,.04); }

/* ─── LINK CARDS ─── */
.link-card { text-decoration: none; color: var(--text); }
.link-card:hover h3 { color: var(--accent); }

/* ─── FOOTER ─── */
.site-footer { text-align: center; padding: 32px 24px; border-top: 1px solid rgba(255,255,255,.06); color: var(--text-muted); font-size: .85rem; }

/* ─── SCROLL REVEAL ─── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-card { max-width: 340px; margin: 0 auto; }
}