/* ============================================
   Syntax Fitness — Shared Styles
   style.css?v=1
   ============================================ */

/* --- reset --- */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* --- theme tokens (light default) --- */
:root {
  --surface-0: #f0efec;
  --surface-1: #fafaf8;
  --surface-2: #e6e5e0;
  --surface-3: #d6d5d0;
  --ink-1: #1c1a16;
  --ink-2: #4a4840;
  --ink-3: #8a8880;
  --line: #cccbc6;
  --accent: #2c2a26;
  --accent-wash: rgba(44, 42, 38, 0.1);
  --green: #1d7a1e;
  --blue: #1e5bb4;
  --red: #c43030;
  --yellow: #9a7000;
  --radius: 6px;
  --radius-sm: 4px;
  --mono: 'IBM Plex Mono', monospace;
  --serif: 'Newsreader', Georgia, serif;
  --dropdown-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

/* --- dark (system) --- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --surface-0: #121210;
    --surface-1: #1a1a18;
    --surface-2: #222220;
    --surface-3: #2c2c28;
    --ink-1: #c8c6c0;
    --ink-2: #9c9890;
    --ink-3: #706e66;
    --line: #2c2c28;
    --accent: #c4c0b8;
    --accent-wash: rgba(196, 192, 184, 0.08);
    --green: #bae67e;
    --blue: #82aaff;
    --red: #f07178;
    --yellow: #ffd580;
    --dropdown-shadow: 0 8px 24px rgba(0,0,0,0.3);
  }
}

/* --- explicit themes --- */
[data-theme="light"] {
  --surface-0: #f0efec;
  --surface-1: #fafaf8;
  --surface-2: #e6e5e0;
  --surface-3: #d6d5d0;
  --ink-1: #1c1a16;
  --ink-2: #4a4840;
  --ink-3: #8a8880;
  --line: #cccbc6;
  --accent: #2c2a26;
  --accent-wash: rgba(44, 42, 38, 0.1);
  --green: #1d7a1e;
  --blue: #1e5bb4;
  --red: #c43030;
  --yellow: #9a7000;
  --dropdown-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

[data-theme="dark"] {
  --surface-0: #121210;
  --surface-1: #1a1a18;
  --surface-2: #222220;
  --surface-3: #2c2c28;
  --ink-1: #c8c6c0;
  --ink-2: #9c9890;
  --ink-3: #706e66;
  --line: #2c2c28;
  --accent: #c4c0b8;
  --accent-wash: rgba(196, 192, 184, 0.08);
  --green: #bae67e;
  --blue: #82aaff;
  --red: #f07178;
  --yellow: #ffd580;
  --dropdown-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

[data-theme="high-contrast"] {
  --surface-0: #000000;
  --surface-1: #0a0a0a;
  --surface-2: #1a1a1a;
  --surface-3: #2a2a2a;
  --ink-1: #ffffff;
  --ink-2: #cccccc;
  --ink-3: #999999;
  --line: #444444;
  --accent: #ffffff;
  --accent-wash: rgba(255, 255, 255, 0.1);
  --green: #5fff5f;
  --blue: #5faaff;
  --red: #ff5f5f;
  --yellow: #ffcc00;
  --dropdown-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

/* --- base typography --- */
body {
  font-family: var(--mono);
  background: var(--surface-0);
  color: var(--ink-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s, color 0.2s;
}

@media (prefers-reduced-motion: reduce) {
  body { transition: none; }
  .nav-dropdown { transition: none !important; }
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- nav --- */
.nav {
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  position: relative;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 500;
  color: var(--ink-1);
  letter-spacing: 0.08em;
  text-decoration: none;
}
.nav-logo:hover { text-decoration: none; opacity: 0.8; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-group {
  position: relative;
}

.nav-trigger {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink-2);
  background: none;
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background-color 0.15s;
  letter-spacing: 0.02em;
}
.nav-trigger:hover,
.nav-trigger:focus-visible {
  color: var(--ink-1);
  background: var(--surface-2);
}
.nav-trigger::after {
  content: ' ▾';
  font-size: 10px;
  opacity: 0.5;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--dropdown-shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 150ms ease, transform 150ms ease;
  z-index: 200;
  min-width: 160px;
}

.nav-group:hover .nav-dropdown,
.nav-group:focus-within .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 13px;
  color: var(--ink-2);
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.1s, color 0.1s;
}
.nav-dropdown a:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.nav-dropdown a:last-child { border-radius: 0 0 var(--radius) var(--radius); }
.nav-dropdown a:hover {
  background: var(--surface-2);
  color: var(--ink-1);
  text-decoration: none;
}
.nav-dropdown a.active {
  color: var(--accent);
  font-weight: 500;
}

/* --- nav actions --- */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  font-family: var(--mono);
  background: none;
  border: none;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-3);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background-color 0.15s;
}
.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: var(--ink-1);
  background: var(--surface-2);
}

.nav-lang {
  font-size: 13px;
  color: var(--ink-3);
}
.nav-lang a { color: var(--ink-3); }
.nav-lang a:hover { color: var(--ink-2); text-decoration: none; }
.nav-lang span { color: var(--ink-2); font-weight: 500; }

.nav-cta {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  background: var(--accent);
  color: var(--surface-0);
  border-radius: var(--radius);
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: opacity 0.15s;
}
.nav-cta:hover { opacity: 0.85; text-decoration: none; }

/* --- hamburger (hidden on desktop) --- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink-2);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-hamburger.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* --- footer --- */
.footer {
  padding: 24px 32px;
  text-align: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
}

/* --- mobile --- */
@media (max-width: 700px) {
  .nav {
    padding: 12px 20px;
    flex-wrap: wrap;
  }

  .nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 0;
    border-top: 1px solid var(--line);
    margin-top: 12px;
  }
  .nav-menu.open {
    display: flex;
  }

  .nav-group {
    border-bottom: 1px solid var(--line);
  }

  .nav-trigger {
    width: 100%;
    text-align: left;
    padding: 12px 0;
    font-size: 14px;
  }
  .nav-trigger::after {
    float: right;
    transition: transform 0.2s;
  }
  .nav-group.expanded .nav-trigger::after {
    transform: rotate(180deg);
  }

  .nav-dropdown {
    position: static;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    background: none;
    border: none;
    box-shadow: none;
    border-radius: 0;
    display: none;
    min-width: auto;
  }
  .nav-group.expanded .nav-dropdown {
    display: block;
  }

  .nav-dropdown a {
    padding: 10px 0 10px 16px;
  }
  .nav-dropdown a:first-child,
  .nav-dropdown a:last-child { border-radius: 0; }

  .nav-actions {
    display: none;
  }
  .nav-menu.open ~ .nav-actions {
    display: flex;
    width: 100%;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--line);
  }

  .nav-hamburger {
    display: flex;
  }

  /* keep CTA visible in top bar on mobile */
  .nav-cta-mobile {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    padding: 6px 12px;
    background: var(--accent);
    color: var(--surface-0);
    border-radius: var(--radius);
    text-decoration: none;
    margin-left: auto;
    margin-right: 8px;
  }
  .nav-cta-mobile:hover { opacity: 0.85; text-decoration: none; }

  .footer {
    padding: 20px;
  }
}