@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700;900&display=swap');

:root {
  --font-display: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --color-ink: #1a1a1a;
  --color-ink-light: #4a4a4a;
  --color-ink-muted: #8a8a8a;
  --color-paper: #f7f3eb;
  --color-paper-dark: #e8e0d0;
  --color-paper-light: #fdfbf7;
  --color-cinnabar: #b83a3a;
  --color-cinnabar-light: #d45555;
  --color-gold: #b8860b;
  --color-gold-light: #d4a843;
  --color-gold-pale: rgba(184, 134, 11, 0.12);
  --color-border: rgba(26, 26, 26, 0.1);
  --color-border-strong: rgba(26, 26, 26, 0.2);
  --color-shadow: rgba(26, 26, 26, 0.06);
  --color-overlay: rgba(247, 243, 235, 0.92);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
  --transition-slow: 0.6s ease;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 100px;

  --navbar-height: 68px;
}

[data-theme="dark"] {
  --color-ink: #e8e0d0;
  --color-ink-light: #b8b0a0;
  --color-ink-muted: #7a7268;
  --color-paper: #1a1814;
  --color-paper-dark: #2a2620;
  --color-paper-light: #242018;
  --color-cinnabar: #e05555;
  --color-cinnabar-light: #f07070;
  --color-gold: #d4a843;
  --color-gold-light: #e8c060;
  --color-gold-pale: rgba(212, 168, 67, 0.15);
  --color-border: rgba(232, 224, 208, 0.1);
  --color-border-strong: rgba(232, 224, 208, 0.2);
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(26, 24, 20, 0.92);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.75;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9998;
  opacity: 0.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-overlay);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--navbar-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: 2px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border: 2px solid var(--color-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--color-gold);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--color-ink-light);
  text-decoration: none;
  font-size: 15px;
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-cinnabar);
  transition: width var(--transition-normal);
}

.nav-links a:hover {
  color: var(--color-cinnabar);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--color-ink-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  transform: rotate(15deg);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  text-decoration: none;
  font-family: inherit;
  line-height: 1.5;
}

.btn-primary {
  background: var(--color-cinnabar);
  color: #fff;
  box-shadow: 0 2px 12px rgba(184, 58, 58, 0.25);
}

.btn-primary:hover {
  background: var(--color-cinnabar-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(184, 58, 58, 0.35);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--color-border-strong);
  color: var(--color-ink);
}

.btn-outline:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.btn-gold {
  background: var(--color-gold);
  color: #fff;
}

.btn-gold:hover {
  background: var(--color-gold-light);
  transform: translateY(-2px);
}

/* ===== HERO ===== */
.hero {
  padding: calc(var(--navbar-height) + var(--space-3xl)) 0 var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-gold-pale) 0%, transparent 70%);
  pointer-events: none;
  animation: breathe 6s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { opacity: 0.4; transform: translateX(-50%) scale(1); }
  50% { opacity: 0.7; transform: translateX(-50%) scale(1.1); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--color-gold-pale);
  border: 1px solid rgba(184, 134, 11, 0.2);
  border-radius: 100px;
  font-size: 14px;
  color: var(--color-gold);
  margin-bottom: var(--space-xl);
  font-family: var(--font-display);
  letter-spacing: 1px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: var(--space-lg);
  letter-spacing: 4px;
}

.hero h1 .accent {
  color: var(--color-cinnabar);
  position: relative;
}

.hero h1 .accent::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--color-gold-pale);
  z-index: -1;
  border-radius: 4px;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-ink-light);
  max-width: 560px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: clamp(40px, 8vw, 100px);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  color: var(--color-cinnabar);
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: var(--color-ink-muted);
  margin-top: var(--space-sm);
  letter-spacing: 1px;
}

/* ===== SECTIONS ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: var(--space-md);
  letter-spacing: 2px;
}

.section-header p {
  font-size: 17px;
  color: var(--color-ink-light);
}

.section-header .divider {
  width: 60px;
  height: 2px;
  background: var(--color-gold);
  margin: var(--space-md) auto 0;
  border-radius: 1px;
}

/* ===== FEATURES ===== */
.features {
  padding: var(--space-3xl) 0;
  background: var(--color-paper-light);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-gold);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--color-shadow);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--color-gold-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: var(--space-md);
  border: 1px solid rgba(184, 134, 11, 0.15);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  letter-spacing: 1px;
}

.feature-card p {
  font-size: 15px;
  color: var(--color-ink-light);
  line-height: 1.7;
}

/* ===== DEMO SECTION ===== */
.demo-section {
  padding: var(--space-3xl) 0;
}

.demo-container {
  background: var(--color-paper-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 4px 24px var(--color-shadow);
}

.demo-header {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  gap: 8px;
  background: var(--color-paper-dark);
}

.demo-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.demo-dot.red { background: #c75c5c; }
.demo-dot.yellow { background: #d4a843; }
.demo-dot.green { background: #5a9e6e; }

.demo-content {
  padding: var(--space-2xl);
}

.demo-form {
  max-width: 640px;
  margin: 0 auto;
}

/* ===== FORMS ===== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-light);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.5px;
}

.form-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--color-paper);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 16px;
  color: var(--color-ink);
  transition: all var(--transition-fast);
  font-family: inherit;
}

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

.form-input::placeholder {
  color: var(--color-ink-muted);
}

.form-input:invalid {
  border-color: var(--color-cinnabar);
}

select.form-input {
  cursor: pointer;
  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='%238a8a8a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.form-hint {
  font-size: 12px;
  color: var(--color-ink-muted);
  margin-top: var(--space-xs);
}

/* ===== METHOD SELECTOR ===== */
.method-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.method-option {
  padding: var(--space-lg);
  background: var(--color-paper);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.method-option:hover {
  border-color: var(--color-gold);
}

.method-option.active {
  border-color: var(--color-cinnabar);
  background: rgba(184, 58, 58, 0.05);
  box-shadow: 0 0 0 3px rgba(184, 58, 58, 0.08);
}

.method-option .icon {
  font-size: 32px;
  margin-bottom: var(--space-sm);
}

.method-option .name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
}

/* ===== RESULTS ===== */
.result-card {
  margin-top: var(--space-xl);
  padding: var(--space-xl);
  background: var(--color-paper);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  display: none;
  animation: fadeInUp 0.5s ease;
}

.result-card.show {
  display: block;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-hexagram {
  text-align: center;
  padding: var(--space-xl);
  background: var(--color-gold-pale);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  border: 1px solid rgba(184, 134, 11, 0.15);
}

.hexagram-svg {
  margin-bottom: var(--space-md);
}

.hexagram-name {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-cinnabar);
  margin-bottom: var(--space-sm);
  letter-spacing: 2px;
}

.hexagram-meaning {
  font-size: 16px;
  color: var(--color-ink-light);
}

.result-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.result-item {
  padding: var(--space-md);
  background: var(--color-paper-light);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.result-item .label {
  font-size: 12px;
  color: var(--color-ink-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-item .value {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  line-height: 1.6;
  white-space: pre-wrap;
}

/* ===== BAZI RESULTS ===== */
.bazi-result {
  display: none;
}

.bazi-result.show {
  display: block;
}

.bazi-table {
  background: var(--color-paper-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.bazi-row {
  display: grid;
  grid-template-columns: 80px repeat(5, 1fr);
  border-bottom: 1px solid var(--color-border);
}

.bazi-row:last-child {
  border-bottom: none;
}

.bazi-header {
  background: var(--color-gold-pale);
  font-weight: 600;
}

.bazi-cell {
  padding: 14px 10px;
  text-align: center;
  font-size: 15px;
  border-right: 1px solid var(--color-border);
}

.bazi-cell:last-child {
  border-right: none;
}

.bazi-pillar {
  font-weight: 700;
  color: var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
}

.bazi-analysis {
  background: var(--color-paper-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-top: var(--space-lg);
  border: 1px solid var(--color-border);
}

.bazi-analysis h4 {
  font-family: var(--font-display);
  color: var(--color-cinnabar);
  margin-bottom: var(--space-md);
  font-size: 18px;
  letter-spacing: 1px;
}

.bazi-analysis p {
  font-size: 14px;
  color: var(--color-ink-light);
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

/* ===== AI CHAT ===== */
.ai-chat-container {
  margin-top: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-paper-light);
}

.ai-chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-gold-pale);
  border-bottom: 1px solid var(--color-border);
}

.ai-chat-header .icon {
  font-size: 22px;
}

.ai-chat-header .title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-gold);
  letter-spacing: 1px;
}

.ai-chat-header .status {
  margin-left: auto;
  font-size: 12px;
  color: var(--color-ink-muted);
}

.ai-chat-header .status.online {
  color: #5a9e6e;
}

.ai-chat-messages {
  height: 380px;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-paper);
}

.ai-chat-messages::-webkit-scrollbar {
  width: 6px;
}

.ai-chat-messages::-webkit-scrollbar-track {
  background: var(--color-paper);
}

.ai-chat-messages::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 3px;
}

.chat-message {
  display: flex;
  gap: 12px;
  max-width: 88%;
  animation: fadeInUp 0.3s ease;
}

.chat-message.ai {
  align-self: flex-start;
}

.chat-message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
  border: 1.5px solid var(--color-border);
}

.chat-message.ai .chat-avatar {
  background: var(--color-gold-pale);
  border-color: rgba(184, 134, 11, 0.2);
}

.chat-message.user .chat-avatar {
  background: rgba(184, 58, 58, 0.08);
  border-color: rgba(184, 58, 58, 0.15);
}

.chat-bubble {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.7;
  word-break: break-word;
}

.chat-message.ai .chat-bubble {
  background: var(--color-paper);
  color: var(--color-ink-light);
  border: 1px solid var(--color-border);
  border-top-left-radius: 4px;
}

.chat-message.user .chat-bubble {
  background: rgba(184, 58, 58, 0.08);
  color: var(--color-ink);
  border: 1px solid rgba(184, 58, 58, 0.12);
  border-top-right-radius: 4px;
}

.chat-bubble pre {
  margin: var(--space-sm) 0;
  padding: var(--space-md);
  background: var(--color-paper-dark);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 13px;
  border: 1px solid var(--color-border);
}

.chat-input-area {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: var(--color-paper);
}

.chat-input {
  flex: 1;
  padding: 12px 16px;
  background: var(--color-paper-light);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-ink);
  resize: none;
  min-height: 44px;
  max-height: 120px;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-gold);
}

.chat-send-btn {
  padding: 12px 24px;
  background: var(--color-cinnabar);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-family: inherit;
}

.chat-send-btn:hover {
  background: var(--color-cinnabar-light);
  transform: translateY(-1px);
}

.chat-send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 6px 0;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: var(--color-ink-muted);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ===== HISTORY ===== */
.history-panel {
  position: fixed;
  top: var(--navbar-height);
  right: -400px;
  width: 360px;
  max-width: 90vw;
  height: calc(100vh - var(--navbar-height));
  background: var(--color-paper-light);
  border-left: 1px solid var(--color-border);
  box-shadow: -4px 0 24px var(--color-shadow);
  z-index: 999;
  transition: right var(--transition-normal);
  overflow-y: auto;
  padding: var(--space-lg);
}

.history-panel.open {
  right: 0;
}

.history-panel h3 {
  font-family: var(--font-display);
  font-size: 20px;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.history-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-ink-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.history-item {
  padding: var(--space-md);
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.history-item:hover {
  border-color: var(--color-gold);
  transform: translateX(-2px);
}

.history-item .time {
  font-size: 12px;
  color: var(--color-ink-muted);
  margin-bottom: 4px;
}

.history-item .method {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-cinnabar);
  margin-bottom: 4px;
}

.history-item .summary {
  font-size: 13px;
  color: var(--color-ink-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item .actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.history-item .actions button {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-ink-light);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-item .actions button:hover {
  border-color: var(--color-cinnabar);
  color: var(--color-cinnabar);
}

.history-empty {
  text-align: center;
  padding: var(--space-2xl) 0;
  color: var(--color-ink-muted);
  font-size: 14px;
}

/* ===== SHARE ===== */
.share-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  justify-content: center;
}

.share-btn {
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  background: var(--color-paper-light);
  color: var(--color-ink-light);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
}

.share-btn:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* ===== NOTIFICATION ===== */
.notification {
  position: fixed;
  top: calc(var(--navbar-height) + var(--space-md));
  right: var(--space-lg);
  padding: 14px 22px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  z-index: 10000;
  max-width: 340px;
  animation: slideIn 0.35s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid;
  box-shadow: 0 8px 32px var(--color-shadow);
}

.notification.warning {
  background: rgba(212, 168, 67, 0.1);
  border-color: rgba(212, 168, 67, 0.3);
  color: var(--color-gold);
}

.notification.error {
  background: rgba(184, 58, 58, 0.1);
  border-color: rgba(184, 58, 58, 0.3);
  color: var(--color-cinnabar);
}

.notification.success {
  background: rgba(90, 158, 110, 0.1);
  border-color: rgba(90, 158, 110, 0.3);
  color: #5a9e6e;
}

@keyframes slideIn {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(120%); opacity: 0; }
}

/* ===== LOADING ===== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-cinnabar);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--color-ink-light);
  letter-spacing: 2px;
}

/* ===== DOCS SECTION ===== */
.docs-section {
  background: var(--color-paper-light);
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border);
}

.doc-card {
  background: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.doc-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: 0 4px 20px var(--color-shadow);
}

.doc-card-title {
  font-family: var(--font-display);
  color: var(--color-gold);
  margin-bottom: var(--space-md);
  font-size: 18px;
  letter-spacing: 1px;
}

.doc-card-pre {
  background: var(--color-paper-dark);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--color-ink-light);
  border: 1px solid var(--color-border);
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.doc-card-list {
  list-style: none;
  padding: 0;
  color: var(--color-ink-light);
  line-height: 2;
  font-size: 14px;
}

.doc-card-list li {
  position: relative;
  padding-left: 16px;
}

.doc-card-list li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--color-gold);
  font-size: 8px;
  top: 2px;
}

/* ===== FOOTER ===== */
.footer {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
  background: var(--color-paper-light);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-links a {
  color: var(--color-ink-light);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-cinnabar);
}

.footer-copy {
  font-size: 13px;
  color: var(--color-ink-muted);
  letter-spacing: 0.5px;
}

/* ===== SKIP LINK ===== */
.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 10001;
  background: var(--color-cinnabar);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.skip-link:focus {
  left: var(--space-md);
  top: var(--space-md);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  :root {
    --navbar-height: 60px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding: calc(var(--navbar-height) + var(--space-2xl)) 0 var(--space-2xl);
  }

  .hero h1 {
    font-size: 32px;
    letter-spacing: 2px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-value {
    font-size: 32px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .method-selector {
    grid-template-columns: 1fr;
  }

  .result-details {
    grid-template-columns: 1fr;
  }

  .bazi-row {
    grid-template-columns: 60px repeat(5, 1fr);
  }

  .bazi-cell {
    padding: 10px 6px;
    font-size: 13px;
  }

  .demo-content {
    padding: var(--space-lg);
  }

  .history-panel {
    width: 100%;
    right: -100%;
  }

  .share-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}