/* SkillForge design system — light default, dark via [data-theme="dark"] */

:root,
[data-theme="light"] {
  color-scheme: light;
  --sf-canvas: #f3f6f4;
  --sf-canvas-accent: rgba(31, 111, 84, 0.08);
  --sf-canvas-accent-2: rgba(20, 24, 27, 0.03);
  --sf-surface: #ffffff;
  --sf-surface-2: #eef3f0;
  --sf-ink: #14181b;
  --sf-ink-soft: #2c3338;
  --sf-muted: #5c676e;
  --sf-faint: #8a949a;
  --sf-line: #d5ddd8;
  --sf-line-strong: #b7c3bc;
  --sf-brand: #1f6f54;
  --sf-brand-strong: #155239;
  --sf-brand-soft: #e6f2ec;
  --sf-brand-fg: #ffffff;
  --sf-danger: #b42318;
  --sf-danger-soft: #fef3f2;
  --sf-danger-line: #fecdca;
  --sf-warn: #b54708;
  --sf-warn-soft: #fffaeb;
  --sf-warn-line: #fedf89;
  --sf-ok: #027a48;
  --sf-ok-soft: #ecfdf3;
  --sf-focus: rgba(31, 111, 84, 0.35);
  --sf-shadow: 0 1px 0 rgba(20, 24, 27, 0.04), 0 8px 24px rgba(20, 24, 27, 0.04);
  --sf-header-bg: rgba(255, 255, 255, 0.86);
  --sf-code-bg: #0f1714;
  --sf-code-fg: #e8eeea;
  --sf-transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease,
    box-shadow 160ms ease;
}

[data-theme="dark"] {
  color-scheme: dark;
  --sf-canvas: #0d1210;
  --sf-canvas-accent: rgba(61, 148, 116, 0.14);
  --sf-canvas-accent-2: rgba(255, 255, 255, 0.02);
  --sf-surface: #151c19;
  --sf-surface-2: #1c2621;
  --sf-ink: #eef2f0;
  --sf-ink-soft: #c9d2cd;
  --sf-muted: #9aa8a1;
  --sf-faint: #6f7c76;
  --sf-line: #2a3530;
  --sf-line-strong: #3a4841;
  --sf-brand: #3d9474;
  --sf-brand-strong: #58b08d;
  --sf-brand-soft: #1a2c24;
  --sf-brand-fg: #04110c;
  --sf-danger: #f97066;
  --sf-danger-soft: #2a1514;
  --sf-danger-line: #5c2b27;
  --sf-warn: #fdb022;
  --sf-warn-soft: #2a2110;
  --sf-warn-line: #5c4a1d;
  --sf-ok: #6ce9a6;
  --sf-ok-soft: #12261c;
  --sf-focus: rgba(61, 148, 116, 0.45);
  --sf-shadow: 0 1px 0 rgba(0, 0, 0, 0.35), 0 12px 32px rgba(0, 0, 0, 0.28);
  --sf-header-bg: rgba(13, 18, 16, 0.88);
  --sf-code-bg: #0a0f0d;
  --sf-code-fg: #dce6e1;
}

html {
  scroll-behavior: smooth;
}

body.sf-body {
  margin: 0;
  min-height: 100vh;
  color: var(--sf-ink);
  background-color: var(--sf-canvas);
  background-image:
    radial-gradient(ellipse 90% 55% at 0% -10%, var(--sf-canvas-accent), transparent 55%),
    radial-gradient(ellipse 70% 45% at 100% 0%, var(--sf-canvas-accent-2), transparent 50%);
  background-attachment: fixed;
  transition: var(--sf-transition);
}

.sf-surface {
  background: var(--sf-surface);
  border: 1px solid var(--sf-line);
  border-radius: 0.75rem;
  box-shadow: var(--sf-shadow);
}

.sf-panel {
  background: var(--sf-surface);
  border: 1px solid var(--sf-line);
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: var(--sf-shadow);
}

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

.sf-faint {
  color: var(--sf-faint);
}

.sf-ink {
  color: var(--sf-ink);
}

.sf-ink-soft {
  color: var(--sf-ink-soft);
}

.sf-brand {
  color: var(--sf-brand);
}

.sf-brand-strong {
  color: var(--sf-brand-strong);
}

.sf-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--sf-line);
  background: var(--sf-header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.sf-footer {
  border-top: 1px solid var(--sf-line);
  background: var(--sf-surface);
  margin-top: auto;
}

.sf-nav-link {
  display: inline-flex;
  align-items: center;
  border-radius: 0.375rem;
  padding: 0.35rem 0.55rem;
  color: var(--sf-ink-soft);
  text-decoration: none;
  transition: var(--sf-transition);
}

.sf-nav-link:hover {
  background: var(--sf-surface-2);
  color: var(--sf-brand-strong);
}

.sf-nav-link:focus-visible,
.sf-btn:focus-visible,
.sf-btn-primary:focus-visible,
.sf-btn-ghost:focus-visible,
.sf-theme-toggle:focus-visible,
.sf-input:focus-visible {
  outline: 2px solid var(--sf-brand);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--sf-focus);
}

.sf-nav-link.is-active {
  background: var(--sf-brand-soft);
  color: var(--sf-brand-strong);
  font-weight: 600;
}

.sf-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border-radius: 0.375rem;
  border: 1px solid transparent;
  background: var(--sf-brand-strong);
  color: var(--sf-brand-fg);
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--sf-transition);
}

.sf-btn-primary:hover {
  background: var(--sf-brand);
}

.sf-btn,
.sf-btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border-radius: 0.375rem;
  border: 1px solid var(--sf-line);
  background: var(--sf-surface);
  color: var(--sf-ink-soft);
  padding: 0.5rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--sf-transition);
}

.sf-btn-ghost {
  border-color: transparent;
  background: transparent;
  color: var(--sf-muted);
}

.sf-btn:hover,
.sf-btn-ghost:hover {
  background: var(--sf-surface-2);
  border-color: var(--sf-line-strong);
  color: var(--sf-ink);
}

.sf-btn-ghost:hover {
  border-color: transparent;
}

.sf-btn-danger {
  border-color: var(--sf-danger-line);
  background: var(--sf-danger-soft);
  color: var(--sf-danger);
}

.sf-input {
  margin-top: 0.25rem;
  display: block;
  width: 100%;
  border-radius: 0.375rem;
  border: 1px solid var(--sf-line-strong);
  background: var(--sf-surface);
  color: var(--sf-ink);
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  box-shadow: none;
  transition: var(--sf-transition);
}

.sf-input::placeholder {
  color: var(--sf-faint);
}

.sf-input:focus {
  border-color: var(--sf-brand);
  outline: none;
  box-shadow: 0 0 0 3px var(--sf-focus);
}

textarea.sf-input {
  min-height: 5rem;
  resize: vertical;
}

.sf-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--sf-ink-soft);
}

.sf-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--sf-line);
  border-radius: 0.75rem;
  background: var(--sf-surface);
  box-shadow: var(--sf-shadow);
}

.sf-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.sf-table thead {
  background: var(--sf-surface-2);
  color: var(--sf-muted);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sf-table th,
.sf-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--sf-line);
}

.sf-table tbody tr {
  transition: background-color 120ms ease;
}

.sf-table tbody tr:hover {
  background: var(--sf-surface-2);
}

.sf-table tbody tr:last-child td {
  border-bottom: none;
}

.sf-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  background: var(--sf-surface-2);
  color: var(--sf-ink-soft);
  padding: 0.15rem 0.55rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.sf-badge-brand {
  background: var(--sf-brand-soft);
  color: var(--sf-brand-strong);
}

.sf-badge-ok {
  background: var(--sf-ok-soft);
  color: var(--sf-ok);
}

.sf-badge-danger {
  background: var(--sf-danger-soft);
  color: var(--sf-danger);
}

.sf-alert {
  border-radius: 0.5rem;
  border: 1px solid var(--sf-line);
  background: var(--sf-surface);
  color: var(--sf-ink-soft);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
}

.sf-alert-danger {
  border-color: var(--sf-danger-line);
  background: var(--sf-danger-soft);
  color: var(--sf-danger);
}

.sf-alert-warn {
  border-color: var(--sf-warn-line);
  background: var(--sf-warn-soft);
  color: var(--sf-warn);
}

.sf-kpi {
  border-radius: 0.5rem;
  background: var(--sf-surface-2);
  padding: 0.85rem 1rem;
  transition: transform 160ms ease, background-color 160ms ease;
}

.sf-kpi:hover {
  transform: translateY(-1px);
}

.sf-kpi-brand {
  background: var(--sf-brand-soft);
}

.sf-kpi-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sf-muted);
}

.sf-kpi-brand .sf-kpi-label {
  color: var(--sf-brand-strong);
}

.sf-kpi-value {
  margin-top: 0.25rem;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--sf-ink);
}

.sf-link {
  color: var(--sf-brand-strong);
  text-decoration: none;
}

.sf-link:hover {
  text-decoration: underline;
}

.sf-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.375rem;
  border: 1px solid var(--sf-line);
  background: var(--sf-surface);
  color: var(--sf-ink-soft);
  cursor: pointer;
  transition: var(--sf-transition);
}

.sf-theme-toggle:hover {
  background: var(--sf-surface-2);
  color: var(--sf-ink);
}

.sf-theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .sf-theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .sf-theme-toggle .icon-moon {
  display: block;
}

.sf-code {
  background: var(--sf-code-bg);
  color: var(--sf-code-fg);
  border: 1px solid var(--sf-line);
  border-radius: 0.5rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.sf-input.sf-code {
  background: var(--sf-code-bg);
  color: var(--sf-code-fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  min-height: 12rem;
}

select.sf-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235c676e' d='M2.5 4.5L6 8l3.5-3.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

[data-theme="dark"] select.sf-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239aa8a1' d='M2.5 4.5L6 8l3.5-3.5'/%3E%3C/svg%3E");
}

.sf-divider {
  border-color: var(--sf-line);
}

.sf-chip-nav {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.sf-chip {
  border-radius: 0.375rem;
  background: var(--sf-surface-2);
  color: var(--sf-ink-soft);
  padding: 0.25rem 0.55rem;
  font-size: 0.8rem;
  text-decoration: none;
  transition: var(--sf-transition);
}

.sf-chip:hover {
  background: var(--sf-brand-soft);
  color: var(--sf-brand-strong);
}

@keyframes sf-fade-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.sf-animate-in {
  animation: sf-fade-up 280ms ease both;
}

/* Candidate integrity: discourage copying prompts */
.sf-prompt {
  user-select: none;
  -webkit-user-select: none;
}

.sf-integrity-banner {
  border-radius: 0.5rem;
  border: 1px solid var(--sf-warn-line);
  background: var(--sf-warn-soft);
  color: var(--sf-warn);
  padding: 0.65rem 0.85rem;
  font-size: 0.8rem;
}

.sf-attempt-clock {
  min-width: 7.5rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.sf-attempt-clock-label {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--sf-ink);
  line-height: 1.1;
}

.sf-attempt-clock-sub {
  margin-top: 0.15rem;
  font-size: 0.7rem;
  color: var(--sf-muted);
}

.sf-attempt-clock.is-urgent .sf-attempt-clock-label {
  color: var(--sf-warn);
}

.sf-attempt-clock.is-expired .sf-attempt-clock-label {
  color: var(--sf-danger);
}

.sf-lock-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: color-mix(in srgb, var(--sf-canvas) 72%, transparent);
  backdrop-filter: blur(6px);
  pointer-events: auto;
}

.sf-lock-overlay[hidden] {
  display: none !important;
}

/* Disable answering UI while locked out — keep takeover controls clickable */
[data-locked-out="1"] article,
[data-locked-out="1"] form,
[data-locked-out="1"] a.sf-btn {
  pointer-events: none;
  opacity: 0.55;
}

.sf-lock-overlay,
.sf-lock-overlay * {
  pointer-events: auto !important;
  opacity: 1 !important;
}

#attempt-take-control {
  cursor: pointer;
}

.sf-integrity-toast {
  position: fixed;
  z-index: 50;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%) translateY(120%);
  max-width: min(28rem, calc(100vw - 2rem));
  border-radius: 0.5rem;
  border: 1px solid var(--sf-line-strong);
  background: var(--sf-surface);
  color: var(--sf-ink);
  box-shadow: var(--sf-shadow);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  opacity: 0;
  transition: transform 200ms ease, opacity 200ms ease;
  pointer-events: none;
}

.sf-integrity-toast.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .sf-animate-in,
  .sf-kpi,
  body.sf-body,
  .sf-integrity-toast {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }

  .sf-integrity-toast.is-visible {
    transform: translateX(-50%);
  }
}