/* ───────────────────────────────────────────────────
   SeminarSmack — Design System
   Mobile-first • Modern • Touch-friendly
   ─────────────────────────────────────────────────── */

:root {
  /* Palette - Dark Mode */
  --bg: #0f172a;
  --bg-deep: #020617;
  --surface: #1e293b;
  --surface-soft: #334155;
  --surface-glass: rgba(30, 41, 59, 0.82);
  --text: #fdfdfd;
  --text-soft: #cbd5e1;
  --muted: #94a3b8;
  --border: #334155;
  --line: rgba(253, 253, 253, 0.08);

  --accent: #ee9ad5;
  --accent-strong: #d946ef;
  --accent-soft: rgba(238, 154, 213, 0.15);
  --teal: #5fd9d7;
  --teal-soft: rgba(95, 217, 215, 0.15);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.15);
  --success: #22c55e;
  --success-soft: rgba(34, 197, 94, 0.15);
  --warning: #f59e0b;
  --warning-soft: rgba(245, 158, 11, 0.15);

  /* Spacing */
  --space-xs: 0.4rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.9rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.5rem;
  --radius-full: 999px;

  /* Shadows */
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.14);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.15);

  /* Typography */
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --sans: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

/* ── Reset ─────────────────────────────────────── */

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(175deg, #1e293b 0%, var(--bg) 40%, #020617 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(238, 154, 213, 0.08), transparent 40%),
    radial-gradient(circle at 85% 20%, rgba(95, 217, 215, 0.08), transparent 35%);
}

a { color: inherit; }

code, pre, input[type="text"], textarea {
  font-family: var(--mono);
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

strong {
  color: var(--text);
}

img { max-width: 100%; height: auto; }

.shell {
  position: relative;
  z-index: 1;
  width: min(780px, calc(100% - var(--space-lg) * 2));
  margin: 0 auto;
  padding: var(--space-md) 0 var(--space-2xl);
}

.shell-wide {
  width: min(1200px, calc(100% - var(--space-lg) * 2));
}

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

.hero, .subhero {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero h1, .subhero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.subhero h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
}

.hero-copy {
  max-width: 560px;
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--text-soft);
}

.eyebrow, .section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 var(--space-sm);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ── Panels / Cards ────────────────────────────── */

.panel {
  background: var(--surface-glass);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
}

.panel-spacious { padding: var(--space-lg); }
.panel:not(.panel-spacious) { padding: var(--space-md); }



/* ── Buttons ───────────────────────────────────── */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.8rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease, opacity 160ms ease;
}

.button:hover, .button:focus-visible {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 2px solid rgba(79, 70, 229, 0.4);
  outline-offset: 2px;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #6366f1 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.3);
}

.button-primary:hover {
  box-shadow: 0 12px 32px rgba(79, 70, 229, 0.4);
}

.button-secondary {
  background: linear-gradient(135deg, var(--teal) 0%, #14b8a6 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(13, 148, 136, 0.25);
}

.button-ghost {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.button-ghost:hover {
  background: var(--surface-soft);
}

.button-danger {
  background: var(--danger-soft);
  border-color: rgba(220, 38, 38, 0.15);
  color: var(--danger);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none;
  box-shadow: none;
}

/* Large touch-friendly button variant */
.button-lg {
  min-height: 3.5rem;
  padding: 1rem 1.75rem;
  font-size: 1.05rem;
}

/* ── Badges / Pills ────────────────────────────── */

.config-pill, .meta-pill, .badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(17, 24, 39, 0.06);
  color: var(--muted);
}

.badge-open { background: var(--success-soft); color: var(--success); }
.badge-locked { background: var(--danger-soft); color: var(--danger); }
.badge-accent { background: var(--accent-soft); color: var(--accent-strong); }

/* ── Grids ─────────────────────────────────────── */

.hero-actions, .field-grid, .output-grid, .card-grid,
.dashboard-grid, .metric-grid, .choice-grid,
.meta-row, .control-row, .copy-row, .status-row, .result-metadata {
  display: grid;
  gap: var(--space-md);
}

.hero-actions {
  grid-template-columns: 1fr;
}

.field-grid { grid-template-columns: 1fr; }
.output-grid, .card-grid, .metric-grid, .choice-grid { grid-template-columns: 1fr; }
.dashboard-grid {
  grid-template-columns: 1fr;
  align-items: start;
}

.dashboard-grid > :empty {
  display: none;
}

.two-up { grid-template-columns: 1fr; }
.three-up { grid-template-columns: 1fr; }

.stack, .stack-lg { display: grid; gap: var(--space-sm); }
.stack-lg { gap: var(--space-md); }

/* ── Form fields ───────────────────────────────── */

.field {
  display: grid;
  gap: 0.35rem;
  color: var(--text-soft);
}

.field span {
  font-size: 0.9rem;
  font-weight: 700;
}

.field input, .field textarea, .field select {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field textarea {
  min-height: 140px;
  resize: vertical;
}

.field select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7280' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.copy-row {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

.copy-row input[readonly] {
  color: var(--muted);
}

/* ── Section headings ──────────────────────────── */

.section-heading, .title-row, .summary-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ── Control / meta rows ───────────────────────── */

.meta-row, .status-row, .control-row, .result-metadata {
  grid-template-columns: 1fr;
}

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

.status-banner {
  min-height: 2.8rem;
  margin: var(--space-md) 0;
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text-soft);
  font-size: 0.95rem;
}

.status-banner:empty { display: none; }
.status-info { background: var(--surface); }
.status-success { background: var(--success-soft); color: var(--success); border-color: rgba(22, 163, 74, 0.2); }
.status-warning { background: var(--warning-soft); color: var(--warning); border-color: rgba(217, 119, 6, 0.2); }
.status-muted { background: var(--surface-soft); color: var(--muted); }

/* ── Session / Activity titles ─────────────────── */

.session-title, .activity-title {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.activity-title {
  font-size: clamp(1.2rem, 2.5vw, 1.7rem);
}

.question-text, .body-copy {
  margin: 0;
  color: var(--text-soft);
  font-size: 1rem;
}

.activity-index {
  font-weight: 700;
  color: var(--accent);
}

/* ── Activity / results shells ─────────────────── */

.activity-shell, .results-shell, .empty-state,
.session-meta, .controls-shell, .authoring-shell {
  display: grid;
  gap: var(--space-md);
}

/* ── Choice cards ──────────────────────────────── */

.choice-card, .text-card, .metric-card {
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.choice-card {
  display: grid;
  gap: var(--space-sm);
}

.choice-header {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  font-weight: 700;
}

.meter {
  position: relative;
  width: 100%;
  height: 12px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--surface-soft);
}

.meter-fill {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent) 0%, #818cf8 100%);
  transition: width 400ms ease;
}

.choice-card.is-correct .meter-fill, .correct-pill {
  background: linear-gradient(90deg, var(--teal) 0%, #14b8a6 100%);
}

.choice-card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.choice-card.is-disabled {
  opacity: 0.6;
}

.choice-select {
  width: 100%;
  text-align: left;
  min-height: 3rem;
}

.choice-meta, .text-meta, .metric-meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  color: var(--muted);
  font-size: 0.85rem;
}

/* ── Text entries ──────────────────────────────── */

.text-entry-list {
  display: grid;
  gap: var(--space-sm);
}

.text-card p { margin: 0; font-size: 1rem; color: var(--text); }
.text-card small { color: var(--muted); }

/* ── Metric cards ──────────────────────────────── */

.metric-card strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -0.03em;
}

/* ── Notices ────────────────────────────────────── */

.notice {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--text-soft);
  font-size: 0.95rem;
}

.notice-warning { background: var(--warning-soft); color: var(--warning); }
.notice-info { background: var(--accent-soft); color: var(--accent-strong); }

/* ── QR code panel ─────────────────────────────── */

.qr-panel {
  display: grid;
  gap: var(--space-lg);
  text-align: center;
}

.qr-panel canvas, .qr-panel img {
  margin: 0 auto;
  border-radius: var(--radius-md);
  max-width: 240px;
}

.room-code-display {
  font-family: var(--mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

/* ── Session builder (create.html) ─────────────── */

.builder-activity-card {
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  display: grid;
  gap: var(--space-md);
  transition: box-shadow 200ms ease;
}

.builder-activity-card:hover {
  box-shadow: var(--shadow-soft);
}

.builder-activity-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.builder-activity-header h3 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text);
}

.builder-activity-actions {
  display: flex;
  gap: var(--space-xs);
}

.builder-option-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-xs);
  align-items: center;
}

.builder-option-row input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 0.95rem;
}

.builder-add-type {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
}

.type-option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
  text-align: left;
  width: 100%;
  color: var(--text);
}

.type-option:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.type-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.type-option-info {
  display: grid;
  gap: 0.15rem;
}

.type-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
}

.type-option-info span {
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Landing page (index.html) ─────────────────── */

.landing-hero {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
}

.landing-hero h1 {
  margin: 0 0 var(--space-md);
  font-size: clamp(2.2rem, 7vw, 4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--accent) 0%, var(--teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.landing-hero .hero-copy {
  margin: 0 auto var(--space-lg);
  max-width: 520px;
  text-align: center;
}

.landing-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.how-it-works {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  counter-reset: steps;
}

.step-card {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-lg);
  text-align: center;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  margin: 0 auto var(--space-xs);
  border-radius: var(--radius-full);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}

.step-card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.step-card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.feature-card {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-lg);
}

.feature-card h3 { margin: 0; font-size: 1.05rem; }
.feature-card p { margin: 0; color: var(--text-soft); font-size: 0.92rem; }

.feature-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.landing-footer {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  color: var(--muted);
  font-size: 0.88rem;
}

.landing-footer a {
  color: var(--accent);
  text-decoration: none;
}

.landing-footer a:hover {
  text-decoration: underline;
}

/* ── Utilities ─────────────────────────────────── */

.hidden { display: none !important; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); }

.divider {
  height: 1px;
  background: var(--border);
}

.footer-note {
  color: var(--muted);
  font-size: 0.88rem;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ── Details / Summary ─────────────────────────── */

details {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

summary {
  cursor: pointer;
  padding: var(--space-md);
  font-weight: 700;
  list-style: none;
}

summary::-webkit-details-marker { display: none; }

details > div {
  padding: 0 var(--space-md) var(--space-md);
}

/* ── Correct answer label ──────────────────────── */

.correct-label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--success-soft);
  color: var(--success);
  font-size: 0.75rem;
  font-weight: 700;
}

/* ── Responsive: Tablet ────────────────────────── */

@media (min-width: 720px) {
  .hero-actions { grid-template-columns: repeat(auto-fit, minmax(200px, max-content)); }
  .field-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
  .output-grid, .card-grid, .metric-grid, .choice-grid { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
  .two-up { grid-template-columns: repeat(2, 1fr); }
  .three-up { grid-template-columns: repeat(3, 1fr); }
  .meta-row, .status-row, .control-row, .result-metadata { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
  .how-it-works { grid-template-columns: repeat(3, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .builder-add-type { grid-template-columns: repeat(3, 1fr); }

  .hero, .subhero {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
  }

  .copy-row { grid-template-columns: minmax(0, 1fr) auto; }

  .panel-spacious { padding: var(--space-xl); }
}

/* ── Responsive: Desktop ───────────────────────── */

@media (min-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Full-width panels */
  .dashboard-grid > #session-summary,
  .dashboard-grid > #control-panel,
  .dashboard-grid > #authoring-panel {
    grid-column: 1 / -1;
  }

  .feature-grid { grid-template-columns: repeat(3, 1fr); }

  .landing-hero {
    padding: var(--space-2xl) var(--space-xl);
  }
}

/* ── Mobile overrides ──────────────────────────── */

@media (max-width: 719px) {
  .shell, .shell-wide {
    width: calc(100% - var(--space-md) * 2);
    padding-top: var(--space-sm);
  }

  .panel, .panel-spacious {
    border-radius: var(--radius-lg);
  }

  .hero, .subhero, .section-heading, .summary-row, .title-row {
    flex-direction: column;
  }

  .copy-row { grid-template-columns: 1fr; }
}