/* SPDX-License-Identifier: Apache-2.0 */

/* ============================================================================
 * Flowatch project-presentation page (landing/style.css)
 *
 * Lifted from src/styles.css editorial-light-regular per PRD FR-F12.
 * Self-contained: no @import, no CDN, no analytics. NFR-9 compliant.
 *
 * Source of truth for visual tokens: src/styles.css :root +
 * html[data-look="editorial"][data-theme="light"] + html[data-density="regular"]
 *
 * Keep in sync by hand when the editorial-light-regular tokens move; this is
 * intentional (no build coupling between the app and this single page).
 * ============================================================================ */

/* ── Self-hosted IBM Plex (Latin subset, weights 400/500/600, no italic) ─── */

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./fonts/ibm-plex-sans-400.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("./fonts/ibm-plex-sans-500.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("./fonts/ibm-plex-sans-600.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./fonts/ibm-plex-mono-400.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("./fonts/ibm-plex-mono-500.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "IBM Plex Serif";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./fonts/ibm-plex-serif-400.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "IBM Plex Serif";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("./fonts/ibm-plex-serif-500.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ── Editorial-light tokens (mirror of src/styles.css) ─────────────────── */

:root {
  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --font-serif: "IBM Plex Serif", "Iowan Old Style", Georgia, serif;

  --r-xs: 3px;
  --r-sm: 5px;
  --r-md: 8px;
  --r-lg: 12px;

  /* editorial-light */
  --bg: oklch(98.2% 0.005 80);
  --bg-elev: oklch(99.5% 0.003 80);
  --bg-sunken: oklch(96% 0.008 80);
  --bg-hover: oklch(94% 0.01 80);
  --line: oklch(89% 0.008 80);
  --line-strong: oklch(80% 0.012 80);
  --fg: oklch(22% 0.01 60);
  --fg-soft: oklch(45% 0.015 60);
  --fg-mute: oklch(62% 0.012 60);
  --accent: oklch(52% 0.16 32);
  --accent-soft: oklch(94% 0.04 32);
  --accent-fg: #fff;
  --ok: oklch(54% 0.13 145);
  --warn: oklch(62% 0.15 70);
  --bad: oklch(55% 0.18 27);

  --font-display: var(--font-serif);
  --font-body: var(--font-sans);
  --tracking-display: -0.01em;
  --display-weight: 500;

  /* density: regular */
  --gap: 12px;
  --pad: 14px;
  --fs: 13.5px;

  /* shadow tokens (subtle — no decorative drama) */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

/* Respect a system dark-mode preference without offering a runtime toggle —
   this single page mirrors src/styles.css editorial-dark tokens.
   The app itself has a richer 3-look × 2-theme system; here we keep it simple. */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: oklch(18% 0.005 80);
    --bg-elev: oklch(21% 0.006 80);
    --bg-sunken: oklch(15% 0.005 80);
    --bg-hover: oklch(25% 0.008 80);
    --line: oklch(28% 0.008 80);
    --line-strong: oklch(38% 0.012 80);
    --fg: oklch(95% 0.005 80);
    --fg-soft: oklch(75% 0.012 60);
    --fg-mute: oklch(58% 0.012 60);
    --accent: oklch(72% 0.16 32);
    --accent-soft: oklch(28% 0.06 32);
    --accent-fg: oklch(18% 0.02 30);
  }
}

/* ── Base ──────────────────────────────────────────────────────────────── */

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

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

body {
  font-family: var(--font-body);
  font-size: var(--fs);
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "ss02", "cv02";
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover {
  text-decoration-thickness: 2px;
}
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  letter-spacing: var(--tracking-display);
  color: var(--fg);
  margin: 0 0 var(--gap);
  font-weight: var(--display-weight);
}

code,
pre,
kbd {
  font-family: var(--font-mono);
  font-size: 0.94em;
}

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

/* ── Skip link (a11y) ──────────────────────────────────────────────────── */

.skip-link {
  position: absolute;
  top: -100px;
  left: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 8px 12px;
  border-radius: var(--r-sm);
  text-decoration: none;
  z-index: 1000;
}
.skip-link:focus {
  top: 8px;
}

/* ── Pre-alpha banner (above the fold) ─────────────────────────────────── */

.pre-alpha-banner {
  background: var(--accent-soft);
  color: var(--fg);
  border-bottom: 1px solid var(--line);
  padding: 8px 24px;
  text-align: center;
  font-size: 0.92em;
}
.pre-alpha-banner strong {
  color: var(--accent);
  margin-right: 4px;
}
.pre-alpha-banner a {
  color: var(--accent);
  margin-left: 4px;
  font-weight: 500;
}

/* ── Topbar ────────────────────────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-elev);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}
.brand:hover {
  text-decoration: none;
}
.brand:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
.lockup {
  color: var(--fg);
  display: block;
}

.topnav {
  display: flex;
  gap: 24px;
  align-items: center;
}
.topnav a {
  color: var(--fg-soft);
  text-decoration: none;
  font-size: 0.95em;
  font-weight: 500;
  padding: 4px 2px;
  border-bottom: 1px solid transparent;
  transition:
    color 120ms ease,
    border-color 120ms ease;
}
.topnav a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Main layout ───────────────────────────────────────────────────────── */

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 32px;
}

section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}
section:last-of-type {
  border-bottom: none;
}

section h2 {
  font-size: 1.65em;
  margin-bottom: 20px;
  letter-spacing: var(--tracking-display);
}

section h3 {
  font-size: 1.1em;
  font-weight: 600;
  font-family: var(--font-body);
  letter-spacing: 0;
  margin: 0 0 6px;
}

section p {
  color: var(--fg-soft);
  max-width: 68ch;
  margin: 0 0 var(--gap);
}

/* ── Hero ──────────────────────────────────────────────────────────────── */

.hero {
  padding-top: 72px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--line);
}
.hero .kicker {
  font-family: var(--font-mono);
  font-size: 0.82em;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 16px;
}
.hero h1 {
  font-size: 2.4em;
  line-height: 1.2;
  margin: 0 0 20px;
  max-width: 22ch;
}
.hero .lede {
  font-size: 1.06em;
  color: var(--fg-soft);
  max-width: 62ch;
  margin: 0 0 28px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0 0 24px;
}
.cta-pull {
  background: var(--fg);
  color: var(--bg);
  padding: 12px 16px;
  border-radius: var(--r-md);
  margin: 0;
  overflow-x: auto;
  font-size: 0.95em;
}
.cta-pull code {
  color: inherit;
  background: none;
  padding: 0;
}
.cta-secondary {
  display: inline-block;
  padding: 12px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
  background: var(--bg-elev);
}
.cta-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.hero-badges {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 24px 0 0;
  padding: 0;
  color: var(--fg-soft);
  font-size: 0.92em;
}
.hero-badges li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--fg-mute);
}
.dot-ok {
  background: var(--ok);
}

/* ── Why ───────────────────────────────────────────────────────────────── */

.why .why-claim {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  color: var(--fg);
  font-size: 1.04em;
  max-width: 64ch;
}

/* ── Tiles ─────────────────────────────────────────────────────────────── */

.tile-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 16px 0 12px;
}
.tile {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px;
}
.tile h3 {
  font-family: var(--font-display);
  letter-spacing: var(--tracking-display);
  font-weight: var(--display-weight);
  font-size: 1.05em;
  margin: 0 0 8px;
  color: var(--accent);
}
.tile p {
  margin: 0;
  color: var(--fg-soft);
  font-size: 0.94em;
  line-height: 1.5;
}
.tiles-footnote {
  font-size: 0.9em;
  color: var(--fg-mute);
  margin-top: 12px;
}

/* ── Differentiators ───────────────────────────────────────────────────── */

.diff-list {
  list-style: none;
  counter-reset: diff;
  padding: 0;
  margin: 0;
}
.diff-list li {
  counter-increment: diff;
  position: relative;
  padding: 16px 0 16px 56px;
  border-top: 1px solid var(--line);
}
.diff-list li:first-child {
  border-top: none;
  padding-top: 0;
}
.diff-list li::before {
  content: counter(diff, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 1.5em;
  color: var(--accent);
  font-weight: 500;
}
.diff-list li:first-child::before {
  top: 0;
}

.look-pill {
  display: inline-block;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  padding: 1px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xs);
  background: var(--bg-elev);
  color: var(--fg);
}
.look-pill.look-terminal {
  font-family: var(--font-mono);
  font-style: normal;
}
.look-pill.look-industrial {
  font-family: var(--font-sans);
  font-style: normal;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85em;
  padding-top: 3px;
}

/* ── Get started (code blocks) ─────────────────────────────────────────── */

.code-block {
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-md);
  padding: 16px 20px;
  margin: 12px 0 16px;
  overflow-x: auto;
  font-size: 0.92em;
  line-height: 1.6;
  color: var(--fg);
}
.code-block code {
  background: none;
  padding: 0;
  color: inherit;
}
.footnote {
  font-size: 0.9em;
  color: var(--fg-mute);
}

/* ── Promises ──────────────────────────────────────────────────────────── */

.promise-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 24px;
}
.promise-list li {
  padding-left: 20px;
  position: relative;
  color: var(--fg-soft);
}
.promise-list li::before {
  content: "✓";
  color: var(--ok);
  font-weight: 600;
  position: absolute;
  left: 0;
  top: 0;
}
.promise-list strong {
  color: var(--fg);
}

/* ── Status ────────────────────────────────────────────────────────────── */

.status-links {
  font-size: 0.95em;
  color: var(--fg-soft);
  margin-top: 16px;
}
.status-links span {
  color: var(--fg-mute);
  margin: 0 6px;
}

/* ── Footer ────────────────────────────────────────────────────────────── */

.site-footer {
  margin-top: 0;
  padding: 48px 32px 32px;
  background: var(--bg-sunken);
  border-top: 1px solid var(--line);
  color: var(--fg-soft);
  font-size: 0.92em;
}
.footer-cols {
  max-width: 880px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}
.footer-brand {
  margin: 0 0 12px;
}
.lockup-sm {
  color: var(--fg);
  display: block;
}
.footer-disclaimer {
  margin: 0;
  font-size: 0.92em;
  color: var(--fg-mute);
  line-height: 1.5;
}
.footer-col h4 {
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-mute);
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-weight: 600;
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-col li {
  margin-bottom: 6px;
}
.footer-col a {
  color: var(--fg-soft);
  text-decoration: none;
}
.footer-col a:hover {
  color: var(--accent);
  text-decoration: underline;
}
.footer-meta {
  max-width: 880px;
  margin: 28px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 0.85em;
  color: var(--fg-mute);
  text-align: center;
}

/* ── Responsive ────────────────────────────────────────────────────────── */

@media (max-width: 720px) {
  .topbar {
    padding: 14px 20px;
  }
  .topnav {
    display: none;
  } /* keep it simple — anchors still work via in-page nav */
  main {
    padding: 0 20px;
  }
  .hero {
    padding-top: 40px;
    padding-bottom: 40px;
  }
  .hero h1 {
    font-size: 1.85em;
  }
  .hero .lede {
    font-size: 1em;
  }
  .tile-grid {
    grid-template-columns: 1fr;
  }
  .promise-list {
    grid-template-columns: 1fr;
  }
  .footer-cols {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .site-footer {
    padding: 32px 20px 24px;
  }
  section {
    padding: 40px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    /* biome-ignore lint/complexity/noImportantStyles: prefers-reduced-motion must override per-element transitions; standard a11y pattern */
    transition: none !important;
    /* biome-ignore lint/complexity/noImportantStyles: prefers-reduced-motion must override per-element animations; standard a11y pattern */
    animation: none !important;
  }
}