:root {
  color-scheme: dark;

  --bg: #080b0e;
  --bg-elevated: #0d1216;
  --surface-base: #11181d;
  --surface-raised: #172027;
  --surface-hover: #1b272e;
  --surface-soft: rgba(255, 255, 255, 0.035);
  --border-subtle: rgba(233, 242, 244, 0.12);
  --border-strong: rgba(233, 242, 244, 0.22);

  --accent-primary: #83d8c6;
  --accent-primary-strong: #a6eadc;
  --accent-secondary: #63aeb9;
  --warning-amber: #e8ad61;
  --danger: #df817b;
  --violet: #a39be6;

  --text-primary: #f1f4f3;
  --text-secondary: #a7b2b2;
  --text-muted: #788485;
  --text-inverse: #08110f;

  --font-base: 'Inter', 'Helvetica Neue', 'Arial', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Meiryo', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --max-width: 1240px;
  --header-height: 74px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shadow-soft: 0 20px 60px rgba(0, 0, 0, 0.24);
  --shadow-lift: 0 24px 70px rgba(0, 0, 0, 0.38);
  --transition-speed: 180ms;
}

@media (prefers-reduced-motion: reduce) {
  :root { --transition-speed: 1ms; }

  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
  }
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 82% -10%, rgba(99, 174, 185, 0.08), transparent 34rem),
    var(--bg);
  font-family: var(--font-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--text-primary);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.12;
}

p { margin-top: 0; }

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

a:hover { color: var(--accent-primary-strong); }

button, input, select, textarea { font: inherit; }

.container {
  width: min(100% - 48px, var(--max-width));
  margin-inline: auto;
}

.card {
  position: relative;
  overflow: hidden;
  padding: 26px;
  background: var(--surface-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: transform var(--transition-speed) ease, border-color var(--transition-speed) ease, background var(--transition-speed) ease;
}

a.card:hover {
  color: inherit;
  border-color: var(--border-strong);
  background: var(--surface-raised);
  transform: translateY(-3px);
}

.btn {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-base);
  font-size: 0.94rem;
  font-weight: 680;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform var(--transition-speed) ease, color var(--transition-speed) ease, background var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  color: var(--text-inverse);
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.btn-primary:hover {
  color: var(--text-inverse);
  background: var(--accent-primary-strong);
  border-color: var(--accent-primary-strong);
}

.btn-secondary,
.btn-ghost {
  color: var(--text-primary);
  background: rgba(8, 11, 14, 0.38);
  border-color: var(--border-strong);
  backdrop-filter: blur(12px);
}

.btn-secondary:hover,
.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.34);
}

.btn:disabled,
.btn.disabled {
  color: var(--text-muted);
  background: var(--surface-base);
  border-color: var(--border-subtle);
  cursor: not-allowed;
  transform: none;
}

.eyebrow,
.tech-text {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.eyebrow { color: var(--accent-primary); }

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 3px 9px;
  color: var(--accent-primary);
  background: rgba(131, 216, 198, 0.08);
  border: 1px solid rgba(131, 216, 198, 0.22);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge-amber { color: var(--warning-amber); border-color: rgba(232, 173, 97, 0.3); }

.text-center { text-align: center; }
.text-secondary { color: var(--text-secondary); }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }

:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 4px;
}

::selection {
  color: var(--text-inverse);
  background: var(--accent-primary);
}

@media (max-width: 640px) {
  .container { width: min(100% - 32px, var(--max-width)); }
  .desktop-only { display: none; }
}