/* ================================================================
   sverm.css — Design System for sverm.ai
   Amber/Teal palette, Inter font, dual theme
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');

/* ── THEMES ──────────────────────────────────────── */

:root, [data-theme="dark"] {
    --bg: #0F172A;
    --surface: #1E293B;
    --surface-hover: #253047;
    --bg-card: #1E293B;
    --bg-card-hover: #253047;
    --border: #334155;
    --text: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-dim: #64748B;
    --text-muted: #475569;
    --accent: #F59E0B;
    --accent-hover: #FBBF24;
    --accent-dim: rgba(245,158,11,0.15);
    --accent-secondary: #14B8A6;
    --accent-secondary-hover: #2DD4BF;
    --accent-secondary-dim: rgba(20,184,166,0.12);
    --border-accent: #F59E0B;
    --code-bg: #0d1117;
    --code-border: #1e2a3a;
    --code-text: #c9d1d9;
    --nav-bg: rgba(15, 23, 42, 0.9);
    --font: 'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="light"] {
    --bg: #ffffff;
    --surface: #F8FAFC;
    --surface-hover: #F1F5F9;
    --bg-card: #F8FAFC;
    --bg-card-hover: #F1F5F9;
    --border: #E2E8F0;
    --text: #0F172A;
    --text-secondary: #475569;
    --text-dim: #64748B;
    --text-muted: #94A3B8;
    --accent: #D97706;
    --accent-hover: #B45309;
    --accent-dim: rgba(217,119,6,0.1);
    --accent-secondary: #0D9488;
    --accent-secondary-hover: #0F766E;
    --accent-secondary-dim: rgba(13,148,136,0.1);
    --border-accent: #D97706;
    --code-bg: #F8FAFC;
    --code-border: #E2E8F0;
    --code-text: #0F172A;
    --nav-bg: rgba(255, 255, 255, 0.9);
}

/* ── RESET ───────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
}

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

/* ── TYPOGRAPHY ──────────────────────────────────── */

h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.25;
}

h3 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-secondary);
    margin-bottom: 1.5rem;
}

.eyebrow-line {
    display: block;
    width: 24px;
    height: 1px;
    background: var(--accent-secondary);
}

.section-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
}

/* ── NAV ─────────────────────────────────────────── */

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.nav-inner {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

.nav-dot {
    width: 26px;
    height: 26px;
    background: url('/brand/sverm-mark.svg') no-repeat center;
    background-size: contain;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-dim);
    transition: color 0.15s;
}

.nav-link:hover { color: var(--text); }

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Hamburger */
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text);
}

.nav-hamburger svg { display: block; }

/* ── THEME PICKER ────────────────────────────────── */

.theme-picker {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-card);
    padding: 0.2rem;
    border-radius: 6px;
    border: 1px solid var(--border);
}

.theme-btn {
    padding: 0.3rem 0.5rem;
    border: none;
    background: transparent;
    color: var(--text-dim);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
    font-family: var(--font);
    transition: all 0.2s;
}

.theme-btn:hover { color: var(--text); }

.theme-btn.active {
    background: var(--accent);
    color: #0F172A;
}

[data-theme="light"] .theme-btn.active {
    color: #fff;
}

/* ── BUTTONS ─────────────────────────────────────── */

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent);
    color: #0F172A;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: var(--font);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: background 0.15s, transform 0.15s;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-ghost {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
    padding-bottom: 1px;
    transition: color 0.15s, border-color 0.15s;
}

.btn-ghost:hover {
    color: var(--text);
    border-color: var(--text-dim);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    color: var(--text);
    font-weight: 500;
    font-size: 0.9rem;
    font-family: var(--font);
    padding: 0.7rem 1.4rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── LAYOUT ──────────────────────────────────────── */

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-narrow {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Body offset for fixed nav */
.has-nav { padding-top: 60px; }

/* ── CARDS ───────────────────────────────────────── */

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    transition: border-color 0.2s;
}

.card:hover { border-color: var(--accent); }

/* ── BREADCRUMB ──────────────────────────────────── */

.breadcrumb {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin: 1rem 0 2rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

/* ── FOOTER ──────────────────────────────────────── */

.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-inner {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--text-dim);
}

/* "Invisible" link in footer-copy — inherits color, shows underline only on hover */
.footer-org {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s, color 0.2s;
}
.footer-org:hover {
    color: var(--text-secondary);
    border-bottom-color: var(--text-dim);
}

.footer-contact {
    display: flex;
    gap: 1.25rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.footer-link {
    font-size: 0.8rem;
    color: var(--text-dim);
    transition: color 0.15s;
}

.footer-link:hover { color: var(--text-secondary); }

/* ── FORMS ───────────────────────────────────────── */

.form-group { margin-bottom: 1.25rem; }

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font);
    font-size: 0.95rem;
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-textarea { min-height: 120px; resize: vertical; }

/* ── RESPONSIVE ──────────────────────────────────── */

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--nav-bg); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); padding: 1rem 2rem; gap: 0.75rem; }
    .nav-hamburger { display: block; }
    .theme-picker { display: none; }
    .nav-links.open + .nav-right .theme-picker { display: flex; }
    .container, .container-narrow, .container-content { padding: 0 1rem; }
    .nav-inner { padding: 0 1rem; }
    .footer-inner { padding: 0 1rem; flex-direction: column; gap: 0.5rem; text-align: center; }
}

/* ── REDUCED MOTION ──────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ---------- BETA-badge ---------- */
.nav-beta {
  display: inline-flex;
  align-items: center;
  margin-left: 0.6rem;
  padding: 2px 7px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  color: var(--accent-secondary);
  background: transparent;
  border: 1px solid var(--accent-secondary);
  border-radius: 4px;
  text-transform: uppercase;
  transform: translateY(-2px);
  flex-shrink: 0;
  user-select: none;
}

@media (max-width: 768px) {
  .nav-beta {
    margin-left: 0.45rem;
    padding: 1px 6px;
    font-size: 0.6rem;
    transform: translateY(-1px);
  }
}