/* ============================================================
 * base.css — Reset, design tokens (CSS variables), typography
 * Used by: home + tất cả sub-pages + dashboard (sau này)
 * ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  /* Surface / background */
  --bg: #000;
  --panel: #040607;
  --panel-soft: #0b1112;

  /* Text */
  --text: #fff;
  --muted: rgba(255, 255, 255, 0.75);
  --line: rgba(255, 255, 255, 0.14);

  /* Brand accent (giữ nguyên hệ teal/mint của Avalook) */
  --color-primary: #89ebcf;     /* mint — alias --mint */
  --color-secondary: #60d8ff;   /* teal — alias --teal */
  --color-accent: #4bf1c6;      /* hero highlight color */
  --color-warning: #f0df52;     /* yellow — alias --yellow */
  --menu-green: #005c49;

  /* Backwards-compat alias (legacy code) */
  --mint: var(--color-primary);
  --teal: var(--color-secondary);
  --yellow: var(--color-warning);

  /* Typography stacks */
  --font-display: "KNOB", "Avalook Knob", "SVN Mission X", sans-serif;
  --font-heading: "KNOB", "Avalook Knob", "SVN Mission X", sans-serif;
  --font-body: "SF Pro Text", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing (8px grid) */
  --spacing-unit: 8px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;

  /* ── Fluid spacing tokens (Canva-style scaling) ──────────────
   * Use these instead of hard-coded px when an element should
   * scale proportionally with viewport width. */
  --space-fluid-xs: clamp(4px, 0.5vw, 8px);
  --space-fluid-sm: clamp(8px, 1vw, 16px);
  --space-fluid-md: clamp(14px, 1.6vw, 24px);
  --space-fluid-lg: clamp(20px, 2.4vw, 40px);
  --space-fluid-xl: clamp(32px, 4vw, 64px);

  /* Fluid font tokens — for headings/buttons that should breathe with viewport. */
  --font-fluid-sm:  clamp(11px, 1vw, 14px);
  --font-fluid-md:  clamp(14px, 1.4vw, 18px);
  --font-fluid-lg:  clamp(18px, 2vw, 28px);
  --font-fluid-xl:  clamp(28px, 3.5vw, 56px);
  --font-fluid-2xl: clamp(42px, 5vw, 84px);

  /* Radii */
  --border-radius: 16px;
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 16px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 32px 60px rgba(0, 0, 0, 0.45);
  --shadow: var(--shadow-lg); /* legacy alias */

  /* Layout */
  /* Layout width is a PROPORTION of viewport (90vw = 5% margin each side),
   * capped at 1760px so on very wide screens content doesn't get stretched
   * absurdly. Margins always scale with the viewport instead of staying a
   * fixed 24px slab. */
  --max-width: min(1760px, 90vw);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  /* Offset in-page anchor jumps by the (sticky, transparent) header height
   * so a clicked nav link lands the section heading just below the header
   * instead of underneath it. --header-h is measured live in JS
   * (SiteHeader) and updated on resize; 64px is a safe SSR/first-paint
   * fallback. The small +14px adds consistent breathing room. */
  scroll-padding-top: calc(var(--header-h, 64px) + 14px);
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.125rem; /* ~18px base size */
  background: var(--bg);

  /* Font rendering — quan trọng để KNOB và SF Pro hiển thị đúng */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;

  /* Cấm browser tự synthesize bold/italic — KNOB chỉ có weight 400.
     Nếu không tắt, h1/h2 default 700 sẽ bị tô đậm giả. */
  font-synthesis: none;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

/* ---------- Page background (radial glow + dark gradient) ---------- */
.page-bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 50% 12%, rgba(96, 216, 255, 0.22), transparent 25%),
    radial-gradient(circle at 22% 33%, rgba(74, 255, 196, 0.12), transparent 22%),
    linear-gradient(180deg, #000 0%, #020505 40%, #000 100%);
  pointer-events: none;
  z-index: -2;
}