/* ============================================================
   BASE — Reset, Tokens (Dark/Light), Typography
   ============================================================ */

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

html,
body {
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
    text-rendering: optimizeLegibility;
}

body {
    min-height: 100vh;
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.55;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
    display: block;
    max-width: 100%;
}

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

button {
    cursor: pointer;
    background: none;
    border: 0;
    padding: 0;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: 600;
    color: var(--color-text);
}

h1 { font-size: 3rem;     line-height: 1.05; letter-spacing: -0.025em; font-weight: 700; }
h2 { font-size: 1.75rem;  line-height: 1.15; letter-spacing: -0.018em; }
h3 { font-size: 1.25rem;  line-height: 1.25; }
h4 { font-size: 1rem;     line-height: 1.4; }

p {
    margin: 0;
}

code, kbd, samp, pre {
    font-family: var(--font-mono);
    font-size: 0.875em;
}

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

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 6px;
}

/* === Design Tokens (defaults = LIGHT) === */

:root {
    color-scheme: light dark;

    --color-bg: #f4f4f0;
    --color-surface: #ffffff;
    --color-surface-2: #ebebe6;
    --color-surface-inverse: #0a0a0b;

    --color-text: #0a0a0b;
    --color-text-muted: #5b5b5e;
    --color-text-subtle: #8a8a8e;
    --color-text-inverse: #ffffff;

    --color-border: rgba(10, 10, 11, 0.08);
    --color-border-strong: rgba(10, 10, 11, 0.16);

    --color-accent: #b8e94e;
    --color-accent-hover: #a3e635;
    --color-accent-soft: rgba(184, 233, 78, 0.18);
    --color-accent-glow: rgba(184, 233, 78, 0.45);
    --color-accent-ink: #1a2e05;

    --color-orange: #fb923c;
    --color-orange-soft: rgba(251, 146, 60, 0.16);
    --color-orange-glow: rgba(251, 146, 60, 0.40);

    --color-success: #22c55e;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --color-info: #3b82f6;

    --shadow-card: 0 1px 2px rgba(10, 10, 11, 0.04), 0 8px 24px -12px rgba(10, 10, 11, 0.08);
    --shadow-card-hover: 0 0 0 1px var(--color-accent-soft), 0 12px 40px -8px var(--color-accent-glow);
    --shadow-ring: 0 0 0 4px var(--color-accent-soft);

    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    --font-sans: 'Poppins', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 380ms cubic-bezier(0.4, 0, 0.2, 1);

    --rail-width: 80px;
    --topbar-height: 88px;
    --content-max: 1640px;
}

[data-theme="dark"] {
    --color-bg: #050506;
    --color-surface: #131316;
    --color-surface-2: #1c1c20;
    --color-surface-inverse: #ffffff;

    --color-text: #f5f5f5;
    --color-text-muted: #9aa0a6;
    --color-text-subtle: #6b6f76;
    --color-text-inverse: #0a0a0b;

    --color-border: rgba(255, 255, 255, 0.07);
    --color-border-strong: rgba(255, 255, 255, 0.14);

    --color-accent: #b8e94e;
    --color-accent-hover: #c8f25f;
    --color-accent-soft: rgba(184, 233, 78, 0.14);
    --color-accent-glow: rgba(184, 233, 78, 0.40);
    --color-accent-ink: #0a0a0b;

    --shadow-card: none;
    --shadow-card-hover: 0 0 0 1px var(--color-accent-soft), 0 16px 48px -12px var(--color-accent-glow);
    --shadow-ring: 0 0 0 4px var(--color-accent-soft);
}

/* === Utilities === */

.u-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.u-text-muted   { color: var(--color-text-muted); }
.u-text-subtle  { color: var(--color-text-subtle); }
.u-text-strong  { color: var(--color-text); font-weight: 600; }
.u-text-accent  { color: var(--color-accent); }
.u-text-orange  { color: var(--color-orange); }
.u-text-mono    { font-family: var(--font-mono); }
.u-text-up      { font-variant-caps: all-small-caps; letter-spacing: 0.04em; }
.u-text-caps    { text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; }
.u-text-center  { text-align: center; }

.u-stack { display: flex; flex-direction: column; }
.u-row   { display: flex; flex-direction: row; align-items: center; }
.u-grow  { flex: 1 1 auto; }
.u-shrink-0 { flex-shrink: 0; }
.u-wrap  { flex-wrap: wrap; }

.u-gap-1 { gap: var(--space-1); }
.u-gap-2 { gap: var(--space-2); }
.u-gap-3 { gap: var(--space-3); }
.u-gap-4 { gap: var(--space-4); }
.u-gap-6 { gap: var(--space-6); }
.u-gap-8 { gap: var(--space-8); }

.u-mt-2 { margin-top: var(--space-2); }
.u-mt-4 { margin-top: var(--space-4); }
.u-mt-6 { margin-top: var(--space-6); }
.u-mt-8 { margin-top: var(--space-8); }
.u-mb-2 { margin-bottom: var(--space-2); }
.u-mb-4 { margin-bottom: var(--space-4); }
.u-mb-6 { margin-bottom: var(--space-6); }
.u-mb-8 { margin-bottom: var(--space-8); }