/* OLT SaaS Platform — design tokens and components.
   Deliberately restrained: credible for universities and business schools, not a startup landing page. */

:root {
  --navy-900: #0b2239;
  --navy-800: #12304f;
  --navy-700: #1b4169;
  --navy-100: #e6edf5;
  --teal-700: #0b6b6b;
  --teal-600: #0f7b7b;
  --teal-100: #dff1f0;
  --ink: #1d2733;
  --ink-muted: #5a6776;
  --line: #dde3ea;
  --surface: #ffffff;
  --canvas: #f6f8fa;
  --success: #1c7c46;
  --success-bg: #e3f4ea;
  --warning: #8a5a00;
  --warning-bg: #fdf2dc;
  --danger: #b42318;
  --danger-bg: #fdecea;
  --info-bg: #e8f1fb;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--canvas);
}

a { color: var(--teal-700); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--navy-800); }
h1, h2, h3, h4 { color: var(--navy-900); line-height: 1.25; margin: 0 0 .5em; font-weight: 650; }
h1 { font-size: clamp(1.75rem, 1.2rem + 1.8vw, 2.5rem); letter-spacing: -.01em; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
code { font-family: var(--mono); font-size: .9em; }

:focus-visible { outline: 3px solid #4d9de0; outline-offset: 2px; border-radius: 4px; }

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--navy-900); color: #fff; padding: 8px 12px; z-index: 100; }
.skip-link:focus { left: 8px; }

.container { width: 100%; max-width: 1180px; margin: 0 auto; padding-inline: 20px; }
.muted { color: var(--ink-muted); }
.small { font-size: .875rem; }
.stack > * + * { margin-top: 1rem; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 40px; padding: 8px 16px; border-radius: var(--radius);
  font: inherit; font-weight: 600; font-size: .95rem; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: background-color .15s, border-color .15s, color .15s;
}
.btn-primary { background: var(--teal-600); color: #fff; }
.btn-primary:hover { background: var(--teal-700); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--navy-800); border-color: var(--line); }
.btn-secondary:hover { border-color: var(--navy-700); color: var(--navy-900); }
.btn-ghost { background: transparent; color: var(--navy-800); }
.btn-ghost:hover { background: var(--navy-100); }
.btn-danger { background: var(--surface); color: var(--danger); border-color: #f0c5c1; }
.btn-sm { min-height: 32px; padding: 4px 10px; font-size: .85rem; }
.btn-link { background: none; border: 0; padding: 0; color: var(--teal-700); font: inherit; cursor: pointer; text-decoration: underline; }

/* ---------- Public site ---------- */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.site-header .container { display: flex; align-items: center; gap: 28px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--navy-900); text-decoration: none; font-weight: 700; letter-spacing: -.01em; }
.brand-mark { width: 30px; height: 30px; border-radius: 7px; background: linear-gradient(135deg, var(--navy-800), var(--teal-600)); color: #fff; display: grid; place-items: center; font-size: .8rem; font-weight: 800; }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a { color: var(--ink); text-decoration: none; padding: 8px 10px; border-radius: 6px; font-weight: 500; }
.site-nav a:hover, .site-nav a.active { background: var(--navy-100); color: var(--navy-900); }
.site-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }

.hero { background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 100%); color: #dbe6f1; padding: 72px 0 64px; }
.hero h1 { color: #fff; max-width: 780px; }
.hero .lead { font-size: 1.15rem; max-width: 680px; margin-bottom: 28px; }
.hero .btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.hero .btn-secondary:hover { border-color: #fff; }

.section { padding: 56px 0; }
.section-alt { background: var(--surface); border-block: 1px solid var(--line); }
.section-heading { max-width: 720px; margin-bottom: 32px; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; font-weight: 700; color: var(--teal-600); margin-bottom: 8px; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow); }
.card h3 { margin-bottom: 6px; }
.card-link { display: block; color: inherit; text-decoration: none; transition: border-color .15s, transform .15s; }
.card-link:hover { border-color: var(--teal-600); color: inherit; transform: translateY(-1px); }
.card-footer { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); display: flex; gap: 10px; align-items: center; }

.product-icon { width: 44px; height: 44px; border-radius: 10px; background: var(--teal-100); color: var(--teal-700); display: grid; place-items: center; font-weight: 800; margin-bottom: 14px; }

.plan { display: flex; flex-direction: column; }
.plan-price { font-size: 1.6rem; font-weight: 700; color: var(--navy-900); margin: 8px 0 2px; }
.plan-price small { font-size: .85rem; font-weight: 500; color: var(--ink-muted); }
.plan ul { padding-left: 18px; margin: 12px 0 0; }
.plan .card-footer { margin-top: auto; }

.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; }
.faq details + details { margin-top: 10px; }
.faq summary { cursor: pointer; font-weight: 600; color: var(--navy-900); }

.site-footer { background: var(--navy-900); color: #9fb3c8; padding: 40px 0; margin-top: 40px; font-size: .9rem; }
.site-footer a { color: #cfdceb; }

/* ---------- App shell (portal + admin) ---------- */
.app-shell { display: grid; grid-template-columns: 248px 1fr; min-height: 100vh; }
.sidebar { background: var(--navy-900); color: #b8c7d8; padding: 18px 12px; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.sidebar .brand { color: #fff; padding: 4px 10px 18px; }
.sidebar-context { margin: 0 6px 16px; padding: 10px 12px; border-radius: var(--radius); background: rgba(255,255,255,.06); font-size: .85rem; }
.sidebar-context strong { display: block; color: #fff; font-size: .95rem; }
.sidebar nav a { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 6px; color: #c9d6e4; text-decoration: none; font-weight: 500; font-size: .92rem; }
.sidebar nav a:hover { background: rgba(255,255,255,.07); color: #fff; }
.sidebar nav a.active { background: var(--teal-600); color: #fff; }
.sidebar-section { text-transform: uppercase; letter-spacing: .08em; font-size: .68rem; color: #7f94ab; padding: 16px 12px 6px; }

.app-main { min-width: 0; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 0 28px; min-height: 60px; background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar .who { margin-left: auto; display: flex; gap: 12px; align-items: center; font-size: .9rem; }
.page { padding: 28px; max-width: 1280px; }
.page-header { display: flex; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.page-header h1 { font-size: 1.6rem; margin: 0; }
.page-header .actions { margin-left: auto; display: flex; gap: 8px; }
.breadcrumbs { font-size: .85rem; color: var(--ink-muted); margin-bottom: 6px; }
.breadcrumbs a { color: var(--ink-muted); }

.kpi { padding: 18px 20px; }
.kpi-label { font-size: .8rem; color: var(--ink-muted); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.kpi-value { font-size: 1.75rem; font-weight: 700; color: var(--navy-900); margin-top: 4px; line-height: 1.2; }
.kpi-value small { font-size: .95rem; color: var(--ink-muted); font-weight: 600; }
.kpi-note { font-size: .82rem; color: var(--ink-muted); margin-top: 4px; }
.kpi.alert .kpi-value { color: var(--danger); }

.subscription-card h3 { display: flex; align-items: center; gap: 8px; }

/* ---------- Legal pages ---------- */
.legal h2 { margin: 36px 0 12px; }
.legal p, .legal li { line-height: 1.65; }
.legal ul { padding-left: 22px; }
.legal li { margin-bottom: 6px; }
.legal .table-wrap { margin: 12px 0 16px; }

/* ---------- Badges ---------- */
.badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 999px; font-size: .74rem; font-weight: 700; letter-spacing: .02em; text-transform: uppercase; background: var(--navy-100); color: var(--navy-800); white-space: nowrap; }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--navy-700); }
.badge-muted { background: #eef1f4; color: var(--ink-muted); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); }
table.data { width: 100%; border-collapse: collapse; font-size: .92rem; }
table.data th { text-align: left; font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-muted); background: #fafbfc; padding: 10px 14px; border-bottom: 1px solid var(--line); white-space: nowrap; }
table.data td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data tr:last-child td { border-bottom: 0; }
table.data td.num, table.data th.num { text-align: right; font-variant-numeric: tabular-nums; }
.empty { padding: 36px; text-align: center; color: var(--ink-muted); }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px 20px; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-weight: 600; font-size: .88rem; margin-bottom: 6px; color: var(--navy-900); }
.field .hint { font-size: .8rem; color: var(--ink-muted); margin-top: 4px; }
input[type=text], input[type=email], input[type=url], input[type=number], input[type=date], input[type=tel], select, textarea {
  width: 100%; min-height: 40px; padding: 8px 12px; font: inherit; color: var(--ink);
  background: #fff; border: 1px solid #c9d2dc; border-radius: var(--radius);
}
textarea { min-height: 110px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--teal-600); outline: 3px solid rgba(15,123,123,.18); outline-offset: 0; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 500; }
.check input { width: 18px; height: 18px; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 18px 20px 22px; margin: 0 0 20px; background: var(--surface); }
legend { font-weight: 700; color: var(--navy-900); padding: 0 6px; }
.form-actions { display: flex; gap: 10px; margin-top: 8px; }
.validation-message, .field-error { color: var(--danger); font-size: .82rem; margin-top: 4px; }
.honeypot { position: absolute; left: -10000px; }

/* ---------- Alerts ---------- */
.alert { padding: 12px 16px; border-radius: var(--radius); border: 1px solid; margin-bottom: 18px; }
.alert ul { margin: 6px 0 0; padding-left: 18px; }
.alert-success { background: var(--success-bg); border-color: #b7e0c6; color: #14532d; }
.alert-danger { background: var(--danger-bg); border-color: #f5c2bd; color: #7a1a12; }
.alert-info { background: var(--info-bg); border-color: #c7dcf2; color: var(--navy-800); }
.alert-warning { background: var(--warning-bg); border-color: #f1d9a6; color: #5c3d00; }

.auth-panel { max-width: 460px; margin: 64px auto; }

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .site-header .container { flex-wrap: wrap; padding-block: 10px; }
  .site-actions { margin-left: 0; }
  .page { padding: 20px; }
}