/* Base Styles */
@import url('https://cdn.jsdelivr.net/npm/@fontsource/lxgw-wenkai@5.2.5/index.css');
@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "LXGW WenKai", "Atkinson Hyperlegible", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--transition), color var(--transition);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }
h2 { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; }
h3 { font-size: 1.125rem; font-weight: 600; line-height: 1.4; }

p { color: var(--text-secondary); margin-bottom: 1rem; }

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

a:hover { color: var(--accent-hover); }

/* Layout */
.container {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.875rem 0;
  transition: background-color var(--transition), border-color var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Main Content */
.main {
  padding: 3rem 0 4rem;
}

/* Hero Section */
.hero {
  margin-bottom: 2.5rem;
}

.hero h1 {
  margin-bottom: 0.75rem;
}

.hero .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.hero .desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.5;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  padding: 0.375rem 0.5rem;
  font-size: 0.8125rem;
}

.btn-ghost:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

/* Form Elements */
.form-question {
  font-size: 1.0625rem;
  font-weight: 500;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* Radio Group */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-option {
  display: flex;
  align-items: center;
  padding: 0.875rem 1rem;
  background-color: var(--bg-secondary);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.radio-option:hover {
  border-color: var(--accent);
  background-color: var(--accent-light);
}

.radio-option input[type="radio"] {
  margin-right: 0.75rem;
  accent-color: var(--accent);
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.radio-option.selected {
  border-color: var(--accent);
  background-color: var(--accent-light);
}

.radio-option label {
  flex: 1;
  cursor: pointer;
  font-size: 0.9375rem;
  line-height: 1.5;
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 3px;
  background-color: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.progress-fill {
  height: 100%;
  background-color: var(--accent);
  transition: width 300ms ease;
}

/* Result Box */
.result-box {
  padding: 2rem 1.5rem;
  border-radius: var(--radius-md);
  margin-top: 1.5rem;
  text-align: center;
}

.result-box.level-none {
  background-color: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--success);
}

.result-box.level-mild {
  background-color: rgba(245, 158, 11, 0.08);
  border: 1px solid var(--warning);
}

.result-box.level-moderate {
  background-color: rgba(245, 158, 11, 0.12);
  border: 1px solid var(--warning);
}

.result-box.level-moderately-severe {
  background-color: rgba(249, 115, 22, 0.12);
  border: 1px solid rgba(249, 115, 22, 1);
}

.result-box.level-severe {
  background-color: rgba(239, 68, 68, 0.08);
  border: 1px solid var(--danger);
}

.result-score {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.375rem;
  letter-spacing: -0.03em;
}

.result-level {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.result-advice {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* Disclaimer */
.disclaimer {
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--warning);
  padding: 1rem 1.125rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin: 2rem 0;
  line-height: 1.6;
}

.disclaimer strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.25rem;
}

/* History List */
.history-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.history-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.history-list {
  list-style: none;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  transition: all var(--transition);
}

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

.history-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.history-scale {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.history-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.history-trend {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.history-actions {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Language Dropdown */
.lang-dropdown {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.5rem;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8125rem;
  transition: all var(--transition);
}

.lang-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 0.375rem);
  right: 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  min-width: 130px;
  display: none;
  z-index: 50;
  overflow: hidden;
}

.lang-menu.show {
  display: block;
}

.lang-option {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.8125rem;
  color: var(--text-primary);
  transition: background-color var(--transition);
}

.lang-option:hover {
  background-color: var(--bg-hover);
}

.lang-option.active {
  color: var(--accent);
  font-weight: 500;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  padding: 0;
}

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

.theme-toggle svg {
  display: block;
}

/* Section spacing */
.section {
  margin-bottom: 2rem;
}

/* Scale Cards Grid */
.scale-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.scale-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 1.25rem;
}

.scale-card .card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.scale-card .card-title {
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
}

.scale-card .card-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.scale-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.625rem;
  margin-top: 1.25rem;
}

.scale-card .card-footer .btn {
  flex: 1;
  max-width: 200px;
}

.scale-info {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.scale-info .separator {
  color: var(--border-color);
}

/* Latest score badge on card */
.latest-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.875rem;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  margin-top: 0.5rem;
}

.latest-badge.empty {
  color: var(--text-muted);
  background: none;
  padding: 0.5rem 0;
  margin-top: 0;
}

.latest-score {
  font-weight: 600;
  color: var(--text-primary);
}

.latest-level {
  color: var(--text-secondary);
}

.latest-trend {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Result actions */
.result-actions {
  display: flex;
  gap: 0.625rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Question number badge */
.question-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  background-color: var(--accent-light);
  color: var(--accent);
  border-radius: 50%;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Test page header */
.test-header {
  margin-bottom: 2rem;
}

.test-header h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.test-timeframe {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Nav buttons */
.nav-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 2rem;
}

.nav-buttons .btn {
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
}

/* About page */
.about-section {
  margin-bottom: 2rem;
}

.about-section h2 {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.about-section p,
.about-section li {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.about-section ul {
  padding-left: 1.25rem;
}

.about-section li {
  margin-bottom: 0.5rem;
}