/* ============================================================
   CodeStudio landing
   ============================================================ */

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

:root {
  /* ---- color ---- */
  --void: #040405;
  --void2: #08090b;
  --void3: #0c0d10;
  --glass: rgba(255,255,255,0.045);
  --glass-hover: rgba(255,255,255,0.09);
  --text: #f5f5f7;
  --dim: #93939c;
  --dim2: #58585f;
  --accent: #ff5c38;
  --cyan: #5ad1ff;
  --magenta: #ff4fd8;
  --amber: #ffb86b;

  /* ---- borders (named opacity steps on white, used over --void/--glass) ---- */
  --border-faint: rgba(255,255,255,0.05);
  --border-default: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.18);

  /* ---- type ---- */
  --display: 'Inter Tight', 'Inter', sans-serif;
  --sans: 'Inter', sans-serif;

  /* type scale — 6 named steps cover all body/label/UI text */
  --text-2xs: 11.5px;   /* glass-label, micro-caps */
  --text-xs: 13px;      /* nav, buttons, kickers, indices, footer */
  --text-sm: 14.5px;    /* card copy, code, arrows */
  --text-md: 15px;      /* enter-link, hero-mark dot context */
  --text-base: 16.5px;  /* paragraph body */
  --text-lg: 17px;      /* hero subtext */

  /* display sizes stay as clamp() per-heading; too distinct per-context to share one var */

  /* ---- spacing scale ---- */
  --space-1: 4px;
  --space-2: 8px;
  --space-2b: 9px;   /* nav-cta vertical pad — odd value kept exact, named */
  --space-3: 12px;
  --space-3b: 10px;  /* enter-link icon gap */
  --space-4: 16px;
  --space-4b: 18px;  /* nav-cta horizontal pad */
  --space-5: 20px;
  --space-5b: 22px;  /* cap-item index margin */
  --space-6: 24px;
  --space-6b: 26px;  /* about-kicker margin */
  --space-6c: 28px;  /* hero-kicker margin */
  --space-7: 32px;
  --space-7b: 36px;  /* nav-links gap, about-statement margin */
  --space-7c: 38px;  /* cap-item vertical pad */
  --space-8: 40px;
  --space-8b: 44px;  /* section/nav horizontal pad, desktop */
  --space-9: 48px;
  --space-10: 56px;
  --space-11: 76px;
  --space-12: 110px;
  --space-13: 160px;
  --space-14: 180px;
  --space-mobile: 22px; /* nav/section horizontal pad, mobile */

  /* ---- radius ---- */
  --radius-sm: 16px;
  --radius-md: 20px;
  --radius-pill: 100px;

  /* ---- shadow ---- */
  --shadow-panel: 0 40px 100px -40px rgba(0,0,0,0.8), inset 0 1px 0 rgba(255,255,255,0.06);
}

html { scroll-behavior: smooth; }

body {
  background: var(--void);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

::selection { background: var(--accent); color: #fff; }
a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ================= NAV ================= */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8b);
  height: 76px;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}

#nav.scrolled {
  background: rgba(4, 4, 5, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-faint);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--display);
  font-weight: 600;
  font-size: var(--text-md);
  letter-spacing: -0.01em;
}

.nav-logo-icon {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-7b);
  list-style: none;
}

.nav-links a {
  color: var(--dim);
  font-size: var(--text-xs);
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
}

.nav-links a:hover { color: var(--text); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text);
  border: 1px solid var(--border-default);
  background: var(--glass);
  padding: var(--space-2b) var(--space-4b);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(8px);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.nav-cta:hover {
  background: var(--glass-hover);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.nav-cta-arrow { font-size: var(--text-sm); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-hamburger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; }
.nav-hamburger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 99;
  display: flex;
  flex-direction: column;
  padding: 92px 24px 28px;
  gap: 2px;
  background: rgba(4,4,5,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-faint);
  transform: translateY(-100%);
  opacity: 0;
  transition: transform 0.32s ease, opacity 0.28s ease;
  pointer-events: none;
}

.mobile-menu.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu a {
  color: var(--dim);
  font-size: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--border-faint);
  transition: color 0.2s ease;
}

.mobile-menu a:hover { color: var(--text); }

.mobile-menu-cta {
  margin-top: 14px;
  text-align: center;
  color: var(--text) !important;
  background: var(--glass);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  border-bottom: 1px solid var(--border-default) !important;
}

/* ================= LAYOUT ROOT ================= */
main { position: relative; z-index: 2; }

section {
  position: relative;
  padding: var(--space-13) var(--space-8b);
  max-width: 1180px;
  margin: 0 auto;
}

/* ================= HERO ================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-11) var(--space-8b) 0;
  max-width: none;
  overflow: hidden;
}

.hero-video-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--void); /* shows instantly before video paints */
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}

.hero-video-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 65% 50% at 50% 40%, rgba(4,4,5,0.25) 0%, rgba(4,4,5,0.6) 60%, var(--void) 100%),
    linear-gradient(180deg, rgba(4,4,5,0.55) 0%, rgba(4,4,5,0.35) 35%, rgba(4,4,5,0.75) 78%, var(--void) 100%);
}

.hero-noise {
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: overlay;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 140px;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: var(--space-6c);
}

.hero-mark {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(48px, 9vw, 124px);
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--text);
}

.hero-mark .dot {
  color: var(--accent);
  font-size: 0.32em;
  vertical-align: middle;
}

.hero-tag {
  margin-top: var(--space-7);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--dim);
  max-width: 460px;
}

.enter-link {
  margin-top: var(--space-10);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3b);
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--text);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--border-strong);
  transition: border-color 0.25s ease, gap 0.25s ease, color 0.25s ease;
}

.enter-link:hover {
  border-color: var(--accent);
  gap: var(--space-4);
  color: var(--accent);
}

.enter-arrow { font-size: var(--text-sm); }

.enter-link-large {
  font-size: var(--text-md);
  margin-top: var(--space-9);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--space-7b);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-10);
}

.hero-actions .enter-link { margin-top: 0; }

.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-9);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim2);
}

.hero-scroll-line {
  width: 1px;
  height: 34px;
  background: linear-gradient(to bottom, var(--dim2), transparent);
  animation: scrollLine 1.8s ease infinite;
}

@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ================= ABOUT ================= */
.about-kicker {
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim2);
  margin-bottom: var(--space-6b);
}

.about-statement {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  max-width: 880px;
  margin-bottom: var(--space-7b);
}

.about-body {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--dim);
  max-width: 600px;
}

/* ================= CAPABILITIES ================= */
.cap-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-default);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.cap-item {
  background: var(--void2);
  padding: var(--space-7c) var(--space-7);
  transition: background 0.25s ease;
}

.cap-item:hover {
  background: var(--border-faint);
}

.cap-index {
  display: block;
  font-family: var(--display);
  font-size: var(--text-xs);
  color: var(--dim2);
  margin-bottom: var(--space-5b);
}

.cap-item h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.cap-item p {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--dim);
}

/* ================= CLOSING ================= */
.closing {
  position: relative;
  text-align: center;
  padding-top: var(--space-12);
  padding-bottom: var(--space-14);
}

.closing-glow {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 560px;
  height: 360px;
  background: radial-gradient(ellipse at center, rgba(255,92,56,0.12) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

.closing-mark {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(34px, 5.5vw, 64px);
  letter-spacing: -0.025em;
  line-height: 1.12;
}

.closing-note {
  margin-top: var(--space-5);
  font-size: var(--text-xs);
  color: var(--dim2);
}

/* ================= FOOTER ================= */
footer {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-content: center;
  padding: var(--space-8) var(--space-8b) var(--space-10);
  font-size: var(--text-xs);
  color: var(--dim2);
  border-top: 1px solid var(--border-faint);
}

/* ================= SCROLL REVEAL ================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================= RESPONSIVE ================= */
@media (max-width: 880px) {
  .cap-list { grid-template-columns: 1fr; }
  #nav { padding: 0 var(--space-mobile); }
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .nav-hamburger { display: flex; }
  section { padding: var(--space-9) var(--space-mobile); }
  .hero { padding-top: var(--space-9); min-height: 92vh; }
  .hero-actions { flex-direction: column; gap: var(--space-5); }
  .closing { padding-top: var(--space-9); padding-bottom: var(--space-12); }
  .about-statement { margin-bottom: var(--space-6); }
  .cap-item { padding: var(--space-7) var(--space-6); }
}

@media (max-width: 420px) {
  .hero-mark { font-size: clamp(40px, 14vw, 56px); }
  .hero-tag { font-size: var(--text-base); max-width: 320px; }
  #nav { padding: 0 var(--space-4); height: 64px; }
  .nav-logo-text { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-scroll-line { animation: none !important; }
  .hero-video { display: none; }
  .hero-video-wrap { background: var(--void2); }
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ================= SETTINGS PANEL ================= */
.settings-trigger {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 200;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--glass);
  border: 1px solid var(--border-default);
  backdrop-filter: blur(14px);
  color: var(--dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.4s ease;
  outline: none;
}

.settings-trigger:hover {
  background: var(--glass-hover);
  border-color: var(--border-strong);
  color: var(--text);
}

.settings-trigger.is-open {
  transform: rotate(45deg);
  border-color: var(--accent);
  color: var(--accent);
}

.settings-trigger svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Panel */
.settings-panel {
  position: fixed;
  bottom: 84px;
  right: 28px;
  z-index: 199;
  width: 300px;
  background: rgba(8, 9, 11, 0.88);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  backdrop-filter: blur(28px) saturate(150%);
  box-shadow: 0 32px 80px -20px rgba(0,0,0,0.9), inset 0 1px 0 rgba(255,255,255,0.06);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  opacity: 0;
  transform: translateY(12px) scale(0.97);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.settings-panel.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

/* Section header inside panel */
.sp-section-label {
  font-size: var(--text-2xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim2);
  margin-bottom: 12px;
}

.sp-divider {
  height: 1px;
  background: var(--border-faint);
  margin: 0 -20px;
}

/* Toggle row */
.sp-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sp-row-label {
  font-size: var(--text-xs);
  color: var(--dim);
}

/* Toggle switch */
.sp-toggle {
  position: relative;
  width: 38px;
  height: 22px;
  flex-shrink: 0;
}

.sp-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.sp-toggle-track {
  position: absolute;
  inset: 0;
  border-radius: 100px;
  background: var(--border-default);
  border: 1px solid var(--border-faint);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.sp-toggle-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--dim);
  transition: transform 0.2s ease, background 0.2s ease;
}

.sp-toggle input:checked + .sp-toggle-track {
  background: var(--accent);
  border-color: var(--accent);
}

.sp-toggle input:checked + .sp-toggle-track::after {
  transform: translateX(16px);
  background: #fff;
}

/* Speed slider */
.sp-speed-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sp-speed-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sp-speed-val {
  font-size: var(--text-2xs);
  color: var(--accent);
  font-family: var(--display);
  font-weight: 600;
  min-width: 28px;
  text-align: right;
}

.sp-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  border-radius: 100px;
  background: var(--border-default);
  outline: none;
  cursor: pointer;
}

.sp-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 92, 56, 0.2);
  cursor: pointer;
  transition: box-shadow 0.2s ease;
}

.sp-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px rgba(255, 92, 56, 0.3);
}

.sp-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  cursor: pointer;
}

/* Text fields */
.sp-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sp-field label {
  font-size: var(--text-2xs);
  color: var(--dim2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sp-field input {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-faint);
  border-radius: 10px;
  color: var(--text);
  font-family: var(--sans);
  font-size: var(--text-xs);
  padding: 8px 10px;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease;
  width: 100%;
}

.sp-field input:focus {
  border-color: var(--border-strong);
  background: rgba(255,255,255,0.07);
}

/* Language toggle pills */
.sp-lang-pills {
  display: flex;
  gap: 6px;
}

.sp-lang-pill {
  flex: 1;
  padding: 7px 0;
  text-align: center;
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 10px;
  border: 1px solid var(--border-faint);
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  font-family: var(--sans);
}

.sp-lang-pill.active {
  background: var(--glass-hover);
  border-color: var(--border-strong);
  color: var(--text);
}

/* Apply button */
.sp-apply {
  width: 100%;
  padding: 9px 0;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-default);
  background: var(--glass);
  color: var(--text);
  font-family: var(--sans);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
  letter-spacing: 0.02em;
}

.sp-apply:hover {
  background: var(--glass-hover);
  border-color: var(--border-strong);
}

/* Toast feedback */
.sp-toast {
  position: fixed;
  bottom: 88px;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  z-index: 300;
  background: rgba(8,9,11,0.92);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(16px);
  padding: 8px 18px;
  font-size: var(--text-xs);
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
}

.sp-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 420px) {
  .settings-panel {
    right: 16px;
    bottom: 76px;
    width: calc(100vw - 32px);
  }
  .settings-trigger {
    right: 16px;
    bottom: 20px;
  }
}