:root {
    --bg: #F5F7FA;
    --bg-soft: #ECEFF4;
    --surface: #FFFFFF;
    --border: #E1E5EC;
    --ink: #0B1220;
    --text: #171B24;
    --text-muted: #5B6472;
    --accent: #2F6FED;
    --accent-ink: #FFFFFF;
    --accent-2: #0FA36B;
    --shadow: rgba(16, 24, 40, 0.08);
    --shadow-strong: rgba(16, 24, 40, 0.14);
    --canvas-line: rgba(47, 111, 237, 0.22);
    --canvas-dot: rgba(47, 111, 237, 0.55);
    color-scheme: light;
  }

  html[data-theme="dark"] {
    --bg: #0A0E16;
    --bg-soft: #0E1420;
    --surface: #121826;
    --border: #212A3C;
    --ink: #0B1220;
    --text: #E8EAF0;
    --text-muted: #8993A6;
    --accent: #5B8DFF;
    --accent-ink: #0A0E16;
    --accent-2: #2FE3B0;
    --shadow: rgba(0, 0, 0, 0.45);
    --shadow-strong: rgba(0, 0, 0, 0.6);
    --canvas-line: rgba(91, 141, 255, 0.22);
    --canvas-dot: rgba(91, 141, 255, 0.6);
    color-scheme: dark;
  }

  * { box-sizing: border-box; }

  html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.25s ease, color 0.25s ease;
  }

  a { color: inherit; }

  ::selection { background: var(--accent); color: var(--accent-ink); }

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

  .wrap {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 28px;
  }

  /* ---------- header ---------- */

  header {
    padding: 26px 0 10px;
  }

  header .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .logo-mark {
    display: inline-flex;
    align-items: center;
  }

  .logo-mark img {
    display: none;
    height: 40px;
    width: auto;
  }

  .logo-mark img.logo-light { display: block; }
  html[data-theme="dark"] .logo-mark img.logo-light { display: none; }
  html[data-theme="dark"] .logo-mark img.logo-dark { display: block; }

  .brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
  }

  .brand-text strong {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.01em;
  }

  .brand-text span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    text-transform: uppercase;
  }

  .theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 8px var(--shadow);
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  }

  .theme-toggle:hover { transform: scale(1.06); }
  .theme-toggle svg { width: 18px; height: 18px; }
  html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
  html:not([data-theme="dark"]) .theme-toggle .icon-sun { display: none; }

  /* ---------- hero ---------- */

  .hero {
    position: relative;
    padding: 72px 0 56px;
    overflow: hidden;
  }

  .hero canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    mask-image: linear-gradient(to bottom, black 0%, black 60%, transparent 100%);
  }

  .hero-inner {
    position: relative;
    z-index: 1;
    max-width: 640px;
  }

  .status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px 6px 10px;
    border-radius: 999px;
    background: var(--surface);
    border: 1px solid var(--border);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11.5px;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 26px;
  }

  .status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-2);
    box-shadow: 0 0 0 0 rgba(15, 163, 107, 0.5);
    animation: pulse 2.2s infinite;
  }

  @keyframes pulse {
    0%   { box-shadow: 0 0 0 0 rgba(15, 163, 107, 0.45); }
    70%  { box-shadow: 0 0 0 7px rgba(15, 163, 107, 0); }
    100% { box-shadow: 0 0 0 0 rgba(15, 163, 107, 0); }
  }

  @media (prefers-reduced-motion: reduce) {
    .status-dot { animation: none; }
  }

  h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: clamp(2.1rem, 4.6vw, 3.3rem);
    line-height: 1.08;
    letter-spacing: -0.01em;
    margin: 0 0 16px;
  }

  .hero p {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-muted);
    margin: 0;
    max-width: 46ch;
  }

  /* ---------- options ---------- */

  .options {
    padding: 8px 0 64px;
  }

  .option-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  @media (max-width: 900px) {
    .option-grid { grid-template-columns: 1fr 1fr; }
  }

  @media (max-width: 640px) {
    .option-grid { grid-template-columns: 1fr; }
  }

  .card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 28px 26px 26px;
    box-shadow: 0 1px 2px var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
  }

  .card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 32px var(--shadow-strong);
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  }

  .card-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    color: var(--accent);
    margin-bottom: 18px;
  }

  .card-icon svg { width: 24px; height: 24px; }

  .card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.22rem;
    font-weight: 600;
    margin: 0 0 8px;
  }

  .card p {
    font-size: 0.94rem;
    line-height: 1.55;
    color: var(--text-muted);
    margin: 0 0 18px;
  }

  .card-meta {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding-top: 14px;
    margin-top: auto;
    border-top: 1px dashed var(--border);
    display: flex;
    justify-content: space-between;
    margin-bottom: 18px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
    border-radius: 10px;
    background: var(--accent);
    color: var(--accent-ink);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.94rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: filter 0.15s ease, transform 0.15s ease;
  }

  .btn:hover { filter: brightness(1.08); transform: translateX(1px); }
  .btn svg { width: 16px; height: 16px; transition: transform 0.15s ease; }
  .btn:hover svg { transform: translateX(2px); }

  .note {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 22px;
  }

  .note strong { color: var(--text); font-weight: 600; }

  /* ---------- footer ---------- */

  footer {
    border-top: 1px solid var(--border);
    padding: 26px 0;
  }

  footer .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
  }

  footer .logo-mark img { height: 24px; }

  footer .copy {
    font-size: 12.5px;
    color: var(--text-muted);
  }