/* ============================================================
   LAYERS — priority order declared up front
   ============================================================ */
@layer reset, tokens, base, layout, components, utilities;

/* ============================================================
   TOKENS
   ============================================================ */
@layer tokens {
  :root {
    color-scheme: dark;

    /* Tier 1 — literal */
    --void:        #0a0a10;
    --surface:     #14141c;
    --surface-2:   #1c1c28;
    --cyan:        #22e5ff;
    --magenta:     #ff3d94;
    --white:       #f4f5fa;
    --grey:        #9497ad;

    /* Tier 2 — semantic */
    --bg:            var(--void);
    --bg-raised:     var(--surface);
    --bg-raised-2:   var(--surface-2);
    --accent:        var(--cyan);
    --accent-2:      var(--magenta);
    --text:          var(--white);
    --text-muted:    var(--grey);
    --border:        color-mix(in oklab, var(--white) 12%, transparent);
    --border-strong: color-mix(in oklab, var(--white) 24%, transparent);

    --font-display: "Space Grotesk", "Arial Narrow", sans-serif;
    --font-body:    "Inter", system-ui, sans-serif;
    --font-mono:    "JetBrains Mono", ui-monospace, monospace;

    --gutter: clamp(1.25rem, 4vw, 3rem);
    --radius: 14px;

    --in-oklab: ;
  }

  @supports (background: linear-gradient(in oklab, red, blue)) {
    :root { --in-oklab: in oklab; }
  }
}

/* ============================================================
   RESET
   ============================================================ */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; }
  body { margin: 0; }
  img, svg { display: block; max-width: 100%; }
  button { font: inherit; color: inherit; }
  a { color: inherit; }
}

/* ============================================================
   BASE
   ============================================================ */
@layer base {
  html {
    background: var(--bg);
    scrollbar-color: var(--border-strong) transparent;
  }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    overflow-x: hidden;
  }

  h1, h2, h3 {
    font-family: var(--font-display);
    line-height: 1.05;
    margin: 0;
    text-wrap: balance;
  }

  p { text-wrap: pretty; }
  a { text-decoration: none; }

  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
  }

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

  .eyebrow {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
  }
}

/* ============================================================
   LAYOUT
   ============================================================ */
@layer layout {
  .wrap {
    max-width: 72rem;
    margin-inline: auto;
    padding-inline: var(--gutter);
  }

  section { padding-block: clamp(3.5rem, 8vw, 6.5rem); }

  .stack { display: grid; gap: 1rem; }

  .grid-cards {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  }
}

/* ============================================================
   COMPONENTS
   ============================================================ */
@layer components {

  .glow-field {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
      radial-gradient(45rem 30rem at 82% -10%, color-mix(in oklab, var(--magenta) 26%, transparent), transparent 60%),
      radial-gradient(50rem 34rem at 10% 8%, color-mix(in oklab, var(--accent) 22%, transparent), transparent 60%),
      var(--void);
  }

  .nav {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 1.1rem;
    background: color-mix(in oklab, var(--void) 78%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }

  .brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.01em;
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
  }

  .brand-dot {
    inline-size: 0.55em;
    block-size: 0.55em;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0.9em color-mix(in oklab, var(--accent) 70%, transparent);
  }

  .nav-links {
    display: flex;
    gap: clamp(0.9rem, 2vw, 1.6rem);
    align-items: center;
    font-size: 0.92rem;
  }

  .nav-links a:not(.btn) {
    color: var(--text-muted);
    transition: color 0.15s ease;
  }
  .nav-links a:not(.btn):hover { color: var(--text); }

  @media (width < 40rem) {
    .nav-links a:not(.btn) { display: none; }
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    padding: 0.8em 1.4em;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    min-height: 48px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  }
  .btn:active { transform: translateY(1px); }

  .btn-solid {
    background: linear-gradient(135deg var(--in-oklab), var(--accent), color-mix(in oklab, var(--accent) 70%, var(--magenta)));
    color: var(--void);
  }
  .btn-solid:hover { transform: translateY(-1px); }

  .btn-ghost {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text);
  }
  .btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

  .hero { padding-block: clamp(4rem, 12vw, 7rem) clamp(2.5rem, 6vw, 4rem); }

  .hero-headline {
    font-size: clamp(2.4rem, 6.4vw, 4.6rem);
    font-weight: 700;
    letter-spacing: -0.01em;
  }
  .hero-headline .accent { color: var(--accent); }

  .hero-sub {
    max-width: 38rem;
    color: var(--text-muted);
    font-size: clamp(1.02rem, 1.6vw, 1.2rem);
    margin-block-start: 1.1rem;
  }

  .hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    margin-block-start: 2rem;
  }

  .hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: clamp(1.5rem, 4vw, 3rem);
    margin-block-start: 3.2rem;
    padding-block-start: 1.8rem;
    border-top: 1px solid var(--border);
  }

  .stat-num {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
  }
  .stat-label { font-size: 0.82rem; color: var(--text-muted); }

  .ticker-band {
    border-block: 1px solid var(--border);
    background: var(--bg-raised);
    overflow: hidden;
  }

  .ticker-track {
    display: flex;
    width: max-content;
    animation: ticker-scroll 38s linear infinite;
  }
  .ticker-track:hover { animation-play-state: paused; }

  .ticker-item {
    display: inline-flex;
    align-items: center;
    gap: 0.9rem;
    padding-block: 0.9rem;
    padding-inline: 1.6rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-muted);
    white-space: nowrap;
  }
  .ticker-item strong { color: var(--text); font-weight: 500; }
  .ticker-item .dot { color: var(--accent); }

  @keyframes ticker-scroll { to { transform: translateX(-50%); } }

  @media (prefers-reduced-motion: reduce) {
    .ticker-track { animation: none; overflow-x: auto; }
  }

  .section-head { max-width: 34rem; margin-block-end: 2.5rem; }
  .section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); margin-block-start: 0.5rem; }
  .section-head p { color: var(--text-muted); margin-block-start: 0.7rem; }

  .about-grid {
    display: grid;
    gap: clamp(2rem, 5vw, 4rem);
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
  @media (width < 48rem) { .about-grid { grid-template-columns: 1fr; } }

  .about-body p { color: var(--text-muted); }
  .about-body p + p { margin-block-start: 1rem; }

  .credibility { display: grid; gap: 1rem; }
  .credibility-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 0.9rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
  }
  .credibility-row span:first-child { color: var(--text-muted); }
  .credibility-row span:last-child { font-family: var(--font-mono); font-size: 0.88rem; }

  .card {
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.6rem;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    transition: border-color 0.2s ease, transform 0.2s ease;
  }
  .card:hover { border-color: var(--border-strong); transform: translateY(-2px); }

  .card-tag {
    align-self: flex-start;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3em 0.7em;
    border-radius: 999px;
    background: color-mix(in oklab, var(--magenta) 18%, transparent);
    color: color-mix(in oklab, var(--magenta) 60%, white);
  }

  .card h3 { font-size: 1.2rem; }
  .card p { color: var(--text-muted); font-size: 0.94rem; margin: 0; }

  .card-link {
    margin-block-start: auto;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
  }

  .link-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.1rem 1.3rem;
    border-radius: var(--radius);
    background: var(--bg-raised);
    border: 1px solid var(--border);
    transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
  }
  .link-card:hover {
    border-color: var(--accent);
    transform: translateX(3px);
    background: var(--bg-raised-2);
  }
  .link-card .platform-icon {
    inline-size: 2.4rem;
    block-size: 2.4rem;
    border-radius: 10px;
    display: grid;
    place-items: center;
    background: var(--void);
    flex: none;
  }
  .link-card .platform-icon svg { inline-size: 1.2rem; block-size: 1.2rem; }
  .link-card .link-title { font-weight: 600; }
  .link-card .link-sub { color: var(--text-muted); font-size: 0.85rem; }
  .link-card .go { margin-inline-start: auto; color: var(--text-muted); }

  .support-strip {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.8rem clamp(1.4rem, 3vw, 2.2rem);
    border-radius: var(--radius);
    background: linear-gradient(135deg var(--in-oklab), color-mix(in oklab, var(--accent) 14%, var(--bg-raised)), color-mix(in oklab, var(--magenta) 14%, var(--bg-raised)));
    border: 1px solid var(--border);
  }

  .contact-layout {
    display: grid;
    gap: clamp(2rem, 5vw, 3.5rem);
    grid-template-columns: 0.85fr 1.15fr;
  }
  @media (width < 48rem) { .contact-layout { grid-template-columns: 1fr; } }

  form.book-form { display: grid; gap: 1.3rem; }

  .field { display: grid; gap: 0.45rem; }
  .field label { font-size: 0.88rem; font-weight: 600; }
  .field .req { color: var(--accent-2); }

  .field input,
  .field select,
  .field textarea {
    background: var(--bg-raised);
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    padding: 0.85em 1em;
    color: var(--text);
    font: inherit;
    font-size: 1rem;
    min-height: 48px;
  }
  .field textarea { min-height: 7rem; resize: vertical; field-sizing: content; }

  .field input::placeholder,
  .field textarea::placeholder { color: color-mix(in oklab, var(--text-muted) 80%, transparent); }

  .field :is(input, select, textarea):user-invalid {
    border-color: var(--accent-2);
    background: color-mix(in oklab, var(--accent-2) 8%, var(--bg-raised));
  }
  .field :is(input, select, textarea):user-valid {
    border-color: color-mix(in oklab, var(--accent) 60%, var(--border-strong));
  }

  .error-msg { display: none; font-size: 0.82rem; color: var(--accent-2); }
  .field:has(:user-invalid) .error-msg { display: block; }

  .hint { font-size: 0.8rem; color: var(--text-muted); }

  .form-status {
    font-size: 0.9rem;
    padding: 0.9rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    display: none;
  }
  .form-status.is-visible { display: block; }
  .form-status[data-state="success"] { border-color: var(--accent); color: var(--accent); }
  .form-status[data-state="error"] { border-color: var(--accent-2); color: var(--accent-2); }

  .footer {
    border-top: 1px solid var(--border);
    padding-block: 2.4rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.85rem;
  }
  .footer a { color: var(--text-muted); }
  .footer a:hover { color: var(--text); }

  /* Pagination (blog listing) */
  .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.4rem;
    height: 2.4rem;
    padding-inline: 0.6rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    margin-inline-end: 0.4rem;
  }
  .page-numbers.current { border-color: var(--accent); color: var(--accent); }

  @media (prefers-reduced-motion: no-preference) {
    @supports ((animation-timeline: view()) and (animation-range: entry)) {
      .reveal {
        animation: reveal-in linear both;
        animation-timeline: view();
        animation-range: entry 0% cover 30%;
      }
      @keyframes reveal-in { from { opacity: 0; translate: 0 2.2rem; } }
    }
  }
  .no-svda .reveal { opacity: 1; }
}

/* ============================================================
   UTILITIES
   ============================================================ */
@layer utilities {
  .visually-hidden {
    position: absolute;
    clip-path: inset(50%);
    overflow: hidden;
    inline-size: 1px;
    block-size: 1px;
    margin: -1px;
    padding: 0;
    border: 0;
    white-space: nowrap;
  }
}