/* ============================================================
   AI GYM COACH — LANDING PAGE
   Concept: motion-capture stage readout. No photos, no video —
   the signature element is a live animated SVG skeleton with
   ticking joint-angle data, mirroring what the pose model outputs.
   ============================================================ */

:root {
  --bg: #0a0a0c;
  --bg-raised: #101013;
  --ink: #f2f1ed;
  --ink-dim: #8b8b90;
  --ink-faint: #55555a;
  --signal: #c6ff3d;
  --signal-dim: rgba(198, 255, 61, 0.35);
  --signal-glow: rgba(198, 255, 61, 0.15);
  --line: rgba(242, 241, 237, 0.12);
  --line-soft: rgba(242, 241, 237, 0.06);
  --danger: #ff5470;

  --font-display: "Big Shoulders Display", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --container: 1180px;
}

* { box-sizing: border-box; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
}

/* stage-floor grid backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 90%);
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 8px var(--signal);
  animation: dot-pulse 1.6s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 4vw, 48px);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.02;
  margin: 12px 0 0;
}

/* ============ NAV ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 12, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo .dot { color: var(--signal); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-links a { color: var(--ink-dim); transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-links .btn-pill { color: var(--bg); }

.btn-pill {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--signal);
  color: #0a0a0c;
  padding: 10px 20px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}
.btn-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--signal-glow);
}
.btn-ghost {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  padding: 10px 20px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--signal-dim); color: var(--ink); }

@media (max-width: 760px) {
  .nav-links a:not(.btn-pill) { display: none; }
}

/* ============ HERO ============ */
.hero {
  padding: 88px 0 64px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(48px, 7.5vw, 92px);
  text-transform: uppercase;
  line-height: 0.94;
  letter-spacing: 0.005em;
  margin: 14px 0 24px;
}
.hero-title .accent { color: var(--signal); }

.hero-sub {
  font-size: 17px;
  color: var(--ink-dim);
  max-width: 46ch;
  margin: 0 0 36px;
}

.hero-cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* scoreboard strip */
.scoreboard {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.score-cell {
  padding: 20px 20px 20px 0;
  border-right: 1px solid var(--line);
}
.score-cell:last-child { border-right: none; }
.score-val {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 3vw, 40px);
  color: var(--ink);
  line-height: 1;
}
.score-val .unit {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--signal);
  margin-left: 4px;
}
.score-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 6px;
}
@media (max-width: 700px) {
  .scoreboard { grid-template-columns: repeat(2, 1fr); }
  .score-cell:nth-child(2) { border-right: none; }
}

/* ---- signature element: mocap skeleton rig ---- */
.rig-stage {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-raised);
  padding: 24px;
  aspect-ratio: 4 / 5;
  display: flex;
  flex-direction: column;
}
.rig-stage-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.rig-stage-head .rec {
  color: var(--danger);
  display: flex;
  align-items: center;
  gap: 6px;
}
.rig-stage-head .rec::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--danger);
  animation: dot-pulse 1s ease-in-out infinite;
}
.rig-svg-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.rig-readout {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 14px;
  font-family: var(--font-mono);
}
.rig-readout .r-item { text-align: left; }
.rig-readout .r-label {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.rig-readout .r-val {
  font-size: 20px;
  color: var(--signal);
  font-weight: 500;
}

/* skeleton joints/bones animation */
.joint { fill: var(--signal); }
.bone { stroke: var(--ink-dim); stroke-width: 2.5; stroke-linecap: round; fill: none; }
.rig-leg-group { transform-origin: 100px 130px; animation: squat-cycle 2.4s ease-in-out infinite; }
.rig-torso-group { transform-origin: 100px 130px; animation: squat-torso 2.4s ease-in-out infinite; }
@keyframes squat-cycle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(26px); }
}
@keyframes squat-torso {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(18px) rotate(4deg); }
}
.joint-pulse { animation: joint-glow 2.4s ease-in-out infinite; }
@keyframes joint-glow {
  0%, 100% { r: 4; opacity: 1; }
  50% { r: 5.5; opacity: 0.75; }
}

/* ============ FEATURE CARDS ============ */
.section { padding: 80px 0; }
.section-head { max-width: 620px; margin-bottom: 48px; }
.section-sub { color: var(--ink-dim); margin-top: 14px; font-size: 16px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .feature-grid { grid-template-columns: 1fr; }
}
.feature-card {
  background: var(--bg);
  padding: 32px 28px;
  transition: background 0.25s ease;
}
.feature-card:hover { background: var(--bg-raised); }
.feature-icon {
  width: 40px;
  height: 40px;
  color: var(--signal);
  margin-bottom: 20px;
}
.feature-card h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0 0 10px;
}
.feature-card p {
  color: var(--ink-dim);
  font-size: 14.5px;
  margin: 0;
}

/* ============ HOW IT WORKS — REP TIMELINE ============ */
.rep-timeline {
  border-top: 1px solid var(--line);
}
.rep-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  border-bottom: 1px solid var(--line);
  padding: 32px 0;
  gap: 24px;
  align-items: start;
}
.rep-tag {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 40px;
  color: var(--ink-faint);
  line-height: 1;
  transition: color 0.3s ease;
}
.rep-row:hover .rep-tag { color: var(--signal); }
.rep-tag .n { color: inherit; }
.rep-body h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 19px;
  margin: 0 0 8px;
}
.rep-body p {
  color: var(--ink-dim);
  font-size: 15px;
  max-width: 60ch;
  margin: 0;
}
@media (max-width: 640px) {
  .rep-row { grid-template-columns: 1fr; gap: 8px; }
  .rep-tag { font-size: 28px; }
}

/* ============ EXERCISE CHIPS ============ */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.chip {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-dim);
  transition: border-color 0.2s, color 0.2s;
}
.chip:hover { border-color: var(--signal-dim); color: var(--ink); }
.chip .idx { color: var(--signal); }

.tech-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.tech-chip {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  padding: 9px 16px;
  border-radius: 4px;
  color: var(--ink-dim);
}

/* ============ CTA BANNER ============ */
.cta-banner {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 90px 0;
  text-align: center;
}
.cta-banner .section-title { text-align: center; }
.cta-banner-sub {
  color: var(--ink-dim);
  max-width: 46ch;
  margin: 18px auto 36px;
  font-size: 16px;
}
.cta-row-center {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ============ FOOTER ============ */
.footer {
  padding: 40px 0;
}
.footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-left {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-dim);
}
.footer-links {
  display: flex;
  gap: 20px;
  align-items: center;
}
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: 999px;
  transition: border-color 0.2s, color 0.2s;
}
.footer-link:hover { border-color: var(--signal-dim); color: var(--ink); }
.footer-link svg { width: 15px; height: 15px; }

/* focus visibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}