/* ==========================================================================
   Lightspeed design tokens — single source of truth (Apple restraint).
   Every page links this file FIRST. Change a value here and the site follows.
   Dark default: pure black canvas, white type, ONE blue accent (#0071E3).
   Blue is for primary buttons, links and focus rings only — never decoration.
   Type: system stack (real SF Pro on Apple devices), self-hosted Inter 4
   variable (OFL) as the cross-platform match. Browsers fetch Inter only when
   nothing earlier in the stack applies.
   ========================================================================== */

/* Self-hosted Inter 4 variable, optical-size axis, woff2, font-display swap. */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(fonts/Inter-var-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(fonts/Inter-var-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Inter';
  font-style: italic;
  font-weight: 100 900;
  font-display: swap;
  src: url(fonts/Inter-var-italic-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: italic;
  font-weight: 100 900;
  font-display: swap;
  src: url(fonts/Inter-var-italic-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* Canonical colour tokens. */
  --bg: #000000;
  --surface: #1D1D1F;
  --surface-hover: #2C2C2E;
  --separator: rgba(255, 255, 255, 0.12);
  --text-1: #F5F5F7;
  --text-2: #98989D;
  --text-3: #86868B;
  --accent: #0071E3;
  --accent-hover: #0066CC;
  --accent-on: #FFFFFF;
  --link: #2997FF;
  --danger: #FF453A;
  --success: #30D158;

  /* Type stacks. One family everywhere; mono for code/IDs only. */
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Radius system: 14 form groups, 28 large cards, pill marketing CTAs only. */
  --radius-form: 14px;
  --radius-card: 28px;
  --radius-pill: 980px;

  /* Motion: fast hover/focus, Apple ease for entrances, nothing loops. */
  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 150ms;
  --t-med: 200ms;
  --t-slow: 320ms;

  /* ---- Backward-compat aliases (pages migrate to canonical names) ---- */
  --bg-base: var(--bg);
  --surface-1: var(--surface);
  --surface-2: var(--surface);
  --surface-3: var(--surface-hover);
  --border: var(--separator);
  --border-subtle: var(--separator);
  --border-strong: var(--separator);
  --text-primary: var(--text-1);
  --text-secondary: var(--text-2);
  --text-muted: var(--text-3);
  --text-4: var(--text-3);
  --accent-text: var(--link);
  --accent-soft: rgba(0, 113, 227, 0.14);
  --accent-pressed: #0052A3;
  --rank-owner: #F59E0B;
  --rank-admin: #60A5FA;
  --rank-mod: #22C55E;
  --warning: #FCA600;
  --bg-alt: #F5F5F7;
  --radius-sm: 6px;
  --radius-md: var(--radius-form);
  --radius-lg: var(--radius-card);
  --ease: var(--ease-apple);
  --t-micro: var(--t-fast);
  --t-standard: var(--t-med);
  --t-entrance: 600ms;
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: none;

  color-scheme: dark;
}

/* Light theme tokens. */
[data-theme="light"] {
  --bg: #FFFFFF;
  --bg-alt: #F5F5F7;
  --surface: #F5F5F7;
  --surface-hover: #E8E8ED;
  --separator: #D2D2D7;
  --text-1: #1D1D1F;
  --text-2: #6E6E73;
  --text-3: #86868B;
  --accent: #0071E3;
  --accent-hover: #0066CC;
  --accent-on: #FFFFFF;
  --link: #0066CC;
  --danger: #D30005;
  --success: #007D48;
  color-scheme: light;
}

/* Global typography. */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 25px;
  letter-spacing: -0.022em;
  font-optical-sizing: auto;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  background: var(--bg);
  color: var(--text-1);
}

/* Type scale (size / line-height / letter-spacing / weight). */
.t-display { font-size: 96px; line-height: 100px; letter-spacing: -0.015em; font-weight: 600; }
.t-h1 { font-size: 56px; line-height: 60px; letter-spacing: -0.005em; font-weight: 600; }
.t-h2 { font-size: 40px; line-height: 48px; letter-spacing: 0; font-weight: 600; }
.t-title { font-size: 32px; line-height: 36px; letter-spacing: 0.004em; font-weight: 600; }
.t-lead { font-size: 21px; line-height: 29px; letter-spacing: 0.011em; font-weight: 400; }
.t-body { font-size: 17px; line-height: 25px; letter-spacing: -0.022em; font-weight: 400; }
.t-caption { font-size: 14px; line-height: 18px; letter-spacing: -0.016em; font-weight: 400; }
.t-micro { font-size: 12px; line-height: 16px; letter-spacing: -0.01em; font-weight: 400; }
@media (max-width: 480px) {
  .t-display { font-size: 44px; line-height: 48px; }
}

::selection { background: rgba(41, 151, 255, 0.25); }

/* Visible keyboard focus everywhere (blue rings only). */
:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

/* Neutral scrollbars (chrome stays out of the way). */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--separator); border-radius: 8px; }

/* Reduced motion respected globally. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============ LIQUID GLASS SYSTEM ============
   Frosted translucency + top-edge light + deep soft shadow. Real
   backdrop-blur is for floating chrome only (nav, sheets, menus, fabs,
   toasts) — on pure black, blur is invisible, so tiles use the same
   look with plain translucency (much cheaper on school iPads). */
:root {
  --glass-bg: rgba(29, 29, 31, 0.55);
  --glass-bg-strong: rgba(29, 29, 31, 0.72);
  --glass-edge: rgba(255, 255, 255, 0.12);
  --glass-hi: rgba(255, 255, 255, 0.14);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.38);
  --glass-blur: blur(20px) saturate(180%);
}
[data-theme="light"] {
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-bg-strong: rgba(255, 255, 255, 0.72);
  --glass-edge: rgba(0, 0, 0, 0.08);
  --glass-hi: rgba(255, 255, 255, 0.6);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-edge);
  box-shadow: inset 0 1px 0 var(--glass-hi), var(--glass-shadow);
}
.glass-tile {
  background: var(--glass-bg);
  border: 1px solid var(--glass-edge);
  box-shadow: inset 0 1px 0 var(--glass-hi), var(--glass-shadow);
}
/* Light sweep for primary buttons and hovered tiles. */
.glass-sheen { position: relative; overflow: hidden; }
.glass-sheen::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, 0.18) 50%, transparent 60%);
  transform: translateX(-120%);
}
.glass-sheen:hover::after { animation: sheenMove 700ms var(--ease-apple); }

/* Shared motion language: fast in, Apple ease, nothing loops
   (except shimmer/spinner, which signal busy). */
@keyframes glassIn {
  from { opacity: 0; transform: translateY(10px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes popIn {
  0% { opacity: 0; transform: scale(0.92); }
  60% { opacity: 1; transform: scale(1.02); }
  100% { opacity: 1; transform: scale(1); }
}
@keyframes sheenMove {
  from { transform: translateX(-120%); }
  to { transform: translateX(120%); }
}
@keyframes shimmerSlide {
  from { background-position: 200% 0; }
  to { background-position: -200% 0; }
}
@keyframes riseSoft {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.anim-in { animation: glassIn 350ms var(--ease-apple) backwards; }
.anim-pop { animation: popIn 300ms var(--ease-apple) backwards; }
.anim-rise { animation: riseSoft 300ms var(--ease-apple) backwards; }