/* ========================================
   DESIGN SYSTEM — Big Five Personality Test
   温暖、平静的浅色主题 — 适合心理测评
   ======================================== */

:root {
  /* Color Palette — Warm & Calm */
  --bg-primary: #faf8f5;
  --bg-secondary: #f3f0eb;
  --bg-card: #ffffff;
  --bg-card-hover: #fefdfb;
  --surface: #f0ede8;
  --border: rgba(0, 0, 0, 0.07);
  --border-hover: rgba(0, 0, 0, 0.13);

  --text-primary: #2c2a28;
  --text-secondary: #6b6560;
  --text-muted: #9e9790;

  /* Domain Colors — Muted, Earthy, Distinct */
  --color-N: #c2705a;
  --color-N-dim: rgba(194, 112, 90, 0.10);
  --color-E: #c49a3a;
  --color-E-dim: rgba(196, 154, 58, 0.10);
  --color-O: #8a7bbf;
  --color-O-dim: rgba(138, 123, 191, 0.10);
  --color-A: #5ea88a;
  --color-A-dim: rgba(94, 168, 138, 0.10);
  --color-C: #5b8db8;
  --color-C-dim: rgba(91, 141, 184, 0.10);

  /* Accent — Warm Indigo */
  --accent: #6b6099;
  --accent-light: #847ab5;
  --accent-glow: rgba(107, 96, 153, 0.18);

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows — Soft */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.05), 0 1px 4px rgba(0,0,0,0.03);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.03);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* ========================================
   RESET & BASE
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

/* ========================================
   PAGE SYSTEM
   ======================================== */
.page {
  display: none;
  min-height: 100vh;
}
.page.active {
  display: flex;
  flex-direction: column;
}

/* ========================================
   LANDING PAGE
   ======================================== */
#landing {
  position: relative;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  overflow: hidden;
  background: linear-gradient(170deg, #faf8f5 0%, #f0ede8 40%, #e8e3db 100%);
}

.landing-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.25;
  animation: float 25s ease-in-out infinite;
}

.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #d4c4a8, transparent 70%);
  top: -15%; left: -10%;
  animation-delay: 0s;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #b8c8d8, transparent 70%);
  bottom: -10%; right: -5%;
  animation-delay: -8s;
}
.orb-3 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #c8d4c0, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -16s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(20px, -25px) scale(1.03); }
  50% { transform: translate(-15px, 20px) scale(0.97); }
  75% { transform: translate(25px, 10px) scale(1.01); }
}

.landing-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 680px;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(107, 96, 153, 0.08);
  border: 1px solid rgba(107, 96, 153, 0.18);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
}

#landing h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.gradient-text {
  background: linear-gradient(135deg, #6b6099, #8a7bbf, #a89cc8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.85;
}

.subtitle strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Stats */
.stats-row {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-xl);
  min-width: 100px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-num {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* Domain Chips */
.domains-preview {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.domain-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.domain-chip:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.domain-chip .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
}
.domain-chip[data-domain="N"] .dot { background: var(--color-N); }
.domain-chip[data-domain="E"] .dot { background: var(--color-E); }
.domain-chip[data-domain="O"] .dot { background: var(--color-O); }
.domain-chip[data-domain="A"] .dot { background: var(--color-A); }
.domain-chip[data-domain="C"] .dot { background: var(--color-C); }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 38px;
  background: var(--accent);
  color: white;
  font-size: 1.02rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: var(--transition-normal);
}
.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.btn-secondary:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.note {
  margin-top: var(--space-lg);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ========================================
   TEST PAGE
   ======================================== */
.test-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.test-header-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
}

.test-logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.progress-section {
  flex: 1;
  min-width: 0;
}

.progress-bar-container {
  height: 5px;
  background: var(--surface);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.domain-indicator {
  width: 34px; height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: var(--transition-normal);
}

/* Test Body */
.test-body {
  max-width: 680px;
  margin: 0 auto;
  padding: 105px var(--space-xl) var(--space-2xl);
  width: 100%;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-2xl) var(--space-xl);
  margin-bottom: var(--space-xl);
  box-shadow: var(--shadow-md);
  animation: fadeInUp 0.3s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.q-domain-badge {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.73rem;
  font-weight: 600;
}

.q-facet-badge {
  padding: 4px 10px;
  background: var(--surface);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.q-number {
  margin-left: auto;
  font-size: 0.73rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.q-text-zh {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.65;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.q-text-en {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: var(--space-2xl);
}

/* Likert Scale — 柔和、中性的色调 */
.likert-scale {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
}

.likert-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: var(--space-md) var(--space-sm);
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
  min-width: 0;
}

.likert-btn:hover {
  background: var(--bg-card);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.likert-btn.selected {
  border-color: var(--accent);
  background: rgba(107, 96, 153, 0.06);
  box-shadow: 0 0 0 1px var(--accent);
}

.likert-circle {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid var(--text-muted);
  transition: var(--transition-normal);
  position: relative;
  flex-shrink: 0;
}

.likert-btn.selected .likert-circle {
  border-color: var(--accent);
  background: var(--accent);
}

.likert-btn.selected .likert-circle::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 13px;
  font-weight: 700;
}

/* 所有选项统一使用中性色，避免色彩暗示 */
.likert-btn[data-score="1"] .likert-circle { border-color: #b8afa5; }
.likert-btn[data-score="2"] .likert-circle { border-color: #b0a89e; }
.likert-btn[data-score="3"] .likert-circle { border-color: #a8a098; }
.likert-btn[data-score="4"] .likert-circle { border-color: #b0a89e; }
.likert-btn[data-score="5"] .likert-circle { border-color: #b8afa5; }

.likert-btn[data-score="1"].selected .likert-circle,
.likert-btn[data-score="2"].selected .likert-circle,
.likert-btn[data-score="3"].selected .likert-circle,
.likert-btn[data-score="4"].selected .likert-circle,
.likert-btn[data-score="5"].selected .likert-circle {
  background: var(--accent);
  border-color: var(--accent);
}

.likert-btn[data-score="1"].selected,
.likert-btn[data-score="2"].selected,
.likert-btn[data-score="3"].selected,
.likert-btn[data-score="4"].selected,
.likert-btn[data-score="5"].selected {
  border-color: var(--accent);
  background: rgba(107, 96, 153, 0.06);
}

.likert-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.3;
}

/* Test Nav */
.test-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.btn-nav:hover:not(:disabled) {
  box-shadow: var(--shadow-md);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.btn-nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}

/* ========================================
   RESULTS PAGE
   ======================================== */
#results {
  padding: 0;
  background: var(--bg-primary);
}

.results-header {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.results-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.results-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.results-content {
  max-width: 1050px;
  margin: 0 auto;
  padding: 0 var(--space-xl) var(--space-3xl);
}

/* Radar Card */
.radar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  text-align: center;
  box-shadow: var(--shadow-md);
}

.radar-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
}

.radar-card canvas {
  max-width: 100%;
  height: auto !important;
}

/* Domain Results Grid */
.domain-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.domain-result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.domain-result-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.domain-result-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.domain-icon {
  width: 46px; height: 46px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 800;
  flex-shrink: 0;
}

.domain-result-title {
  font-size: 1.05rem;
  font-weight: 600;
}

.domain-result-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.domain-score-bar {
  height: 7px;
  background: var(--surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

.domain-score-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 1s ease;
}

.domain-score-values {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.domain-score-num {
  font-weight: 700;
  font-size: 1.4rem;
}

.domain-description {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* Facet Details */
.facet-details-section {
  margin-bottom: var(--space-2xl);
}

.facet-domain-group {
  margin-bottom: var(--space-xl);
}

.facet-domain-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}

.facet-domain-title .dot-lg {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.facet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.facet-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}
.facet-card:hover {
  box-shadow: var(--shadow-md);
}

.facet-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.facet-name {
  font-size: 0.83rem;
  font-weight: 600;
}

.facet-score-num {
  font-size: 0.83rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.facet-bar {
  height: 4px;
  background: var(--surface);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.facet-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.8s ease;
}

/* Results Actions */
.results-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 2;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 640px) {
  #landing h1 { font-size: 2.2rem; }
  
  .stats-row { gap: var(--space-sm); }
  .stat-card { padding: var(--space-sm) var(--space-md); min-width: 70px; }
  .stat-num { font-size: 1.3rem; }
  
  .question-card { padding: var(--space-lg); }
  .q-text-zh { font-size: 1.12rem; }
  
  .likert-scale { flex-direction: column; }
  .likert-btn {
    flex-direction: row;
    padding: var(--space-sm) var(--space-md);
  }
  .likert-circle { width: 22px; height: 22px; }
  .likert-label { font-size: 0.78rem; }
  
  .domain-results-grid {
    grid-template-columns: 1fr;
  }
  .facet-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   UTILITY: Domain color helpers
   ======================================== */
.domain-N { color: var(--color-N); }
.domain-E { color: var(--color-E); }
.domain-O { color: var(--color-O); }
.domain-A { color: var(--color-A); }
.domain-C { color: var(--color-C); }

.bg-N { background: var(--color-N-dim); }
.bg-E { background: var(--color-E-dim); }
.bg-O { background: var(--color-O-dim); }
.bg-A { background: var(--color-A-dim); }
.bg-C { background: var(--color-C-dim); }