/*
 * Tempo — the shared design vocabulary.
 *
 * Linked by BOTH the landing page (public/index.html) and every server-rendered
 * dashboard page (src/platform/web/render.ts). It used to be two copies of the
 * same token block that drifted apart; now there is one.
 *
 * This file holds tokens, the reset, typography, buttons, focus, and the motion
 * policy. It deliberately does NOT hold page layout — the landing page's sections
 * and the dashboard's forms each keep their own local <style>. One vocabulary,
 * two dialects.
 *
 * MOTION POLICY: every animation on this site is defined inside
 * `@media (prefers-reduced-motion: no-preference)`. Motion is opt-in, not
 * opt-out. A user with Reduce Motion set gets a completely static page rather
 * than a half-animated one — which for an assistive-technology product is not a
 * nicety, it's the entire premise.
 */

/* Lexend is designed for reading proficiency, which is the whole thesis here.
   Self-hosted (not Google Fonts) so a page that promises "we don't leak your
   data" doesn't phone a third party to render its own headline. */
@font-face {
  font-family: "Lexend";
  src: url("/fonts/lexend-latin.woff2") format("woff2");
  font-weight: 300 800;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light dark;

  /* Surfaces */
  --bg: #ffffff;
  --bg-2: #faf9f8;
  --fg: #1d1c1d;
  --muted: #5c5a58;
  --line: #e6e3e0;
  --card: #faf9f8;

  /* Brand — Slack aubergine, kept deliberately. This is a Slack app. */
  --accent: #4a154b;
  --accent-fg: #ffffff;
  --accent-soft: rgba(74, 21, 75, 0.08);

  /* Slack's own secondaries, used for the triage categories */
  --brand-plum: #611f69;
  --brand-rose: #e01e5a;
  --brand-sky: #36c5f0;
  --brand-green: #2eb67d;
  --brand-gold: #ecb22e;

  /* Semantic */
  --good: #1a7f37;
  --danger: #b91c1c;
  --focus: #4a154b;

  /* Triage categories. Never signalled by colour alone — every one of these is
     paired with a text label in the markup. */
  --cat-act: #4a154b;
  --cat-blocker: #b3164a;
  --cat-fyi: #0b6e8c;
  --cat-noise: #7c7975;

  /* Glass. In light mode this must be MOSTLY OPAQUE or it turns into unreadable
     grey soup — the classic glassmorphism failure. */
  --glass: rgba(255, 255, 255, 0.72);
  --glass-line: rgba(29, 28, 29, 0.09);
  --shadow: 0 1px 2px rgba(29, 28, 29, 0.04), 0 8px 24px -12px rgba(29, 28, 29, 0.12);
  --shadow-lg: 0 2px 4px rgba(29, 28, 29, 0.04), 0 24px 48px -16px rgba(29, 28, 29, 0.18);

  --radius: 14px;
  --radius-lg: 22px;
  --font-sans: "Lexend", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #100e12;
    --bg-2: #171419;
    --fg: #f5f4f2;
    --muted: #a8a29e;
    --line: #2a2528;
    --card: #17141a;

    --accent: #d6b8ff;
    --accent-fg: #100e12;
    --accent-soft: rgba(214, 184, 255, 0.12);

    --good: #4ade80;
    --danger: #f87171;
    --focus: #d6b8ff;

    --cat-act: #d6b8ff;
    --cat-blocker: #ff6b9d;
    --cat-fyi: #6dd3f5;
    --cat-noise: #8b8683;

    --glass: rgba(255, 255, 255, 0.045);
    --glass-line: rgba(255, 255, 255, 0.1);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px -12px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 2px 4px rgba(0, 0, 0, 0.4), 0 24px 48px -16px rgba(0, 0, 0, 0.7);
  }
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
* { box-sizing: border-box; }
html { scroll-behavior: auto; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { max-width: 100%; }
a { color: var(--accent); }

h1, h2, h3, h4 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  text-wrap: balance;
}

p { text-wrap: pretty; }

code, pre {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

/* ── Focus — visible on every interactive element, in both themes ────────── */
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Skip link. First thing in the DOM, invisible until focused. */
.skip {
  position: absolute;
  left: 0.75rem;
  top: -100px;
  z-index: 100;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 10px 10px;
  font-weight: 600;
  text-decoration: none;
}
.skip:focus { top: 0; }

/* ── Buttons ────────────────────────────────────────────────────────────── */
/* One button object. The landing page used to call it .cta and the dashboard
   called it .btn; they were the same thing. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px; /* touch target */
  padding: 0.7rem 1.4rem;
  background: var(--accent);
  color: var(--accent-fg);
  border: 1px solid transparent;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease,
    border-color 0.18s ease, opacity 0.18s ease;
}
.btn:hover { box-shadow: var(--shadow); opacity: 0.92; }
.btn:active { transform: translateY(1px); }

.btn.secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--line);
}
.btn.secondary:hover { border-color: var(--accent); background: var(--accent-soft); opacity: 1; }
.btn.danger { background: var(--danger); color: #fff; }

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
}

.muted { color: var(--muted); }

/* ── Motion policy ──────────────────────────────────────────────────────── */
/* Elements marked [data-reveal] start hidden and are revealed by an
   IntersectionObserver.
 *
 * The `.js` guard is load-bearing, not decoration. Only JavaScript ever removes
 * the `opacity: 0`, so if this rule applied unconditionally, a visitor with JS
 * disabled (or a script that failed to load) would get a page whose content is
 * permanently invisible. The `.js` class is set by an inline script in <head>,
 * before first paint — so no-JS means the hidden state is never applied at all,
 * and the page is simply static and complete. Content must never depend on a
 * script to become visible. */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s cubic-bezier(0.2, 0.6, 0.2, 1),
      transform 0.6s cubic-bezier(0.2, 0.6, 0.2, 1);
    transition-delay: var(--d, 0s); /* stagger, set per-element */
  }
  .js [data-reveal].in {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}