/* ===== 问大师 - Global Styles ===== */
:root {
  --color-primary: #8B4513;
  --color-primary-light: #A0522D;
  --color-accent: #D4A574;
  --color-bg: #F5F0E8;
  --color-bg-card: #FFFEF9;
  --color-text: #2C1810;
  --color-text-light: #6B5D4F;
  --color-border: #E0D5C8;
  --color-shadow: rgba(139, 69, 19, 0.12);
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  min-height: 100vh;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Navbar ===== */
.navbar {
  background: linear-gradient(135deg, #5D3A1A, #8B4513);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px var(--color-shadow);
}

.nav-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: #FFF8F0;
  text-decoration: none;
  letter-spacing: 4px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-link {
  color: #E8D5C0;
  text-decoration: none;
  font-size: 15px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s;
}

.nav-link:hover, .nav-link.active {
  color: #FFF;
  border-bottom-color: var(--color-accent);
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 60px 20px 40px;
  background: linear-gradient(180deg, var(--color-bg) 0%, #EDE4D3 100%);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 8px;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--color-text-light);
  letter-spacing: 2px;
  margin-bottom: 28px;
}

.hero-quotes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.quote-tag {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--color-primary);
  cursor: pointer;
  transition: all 0.3s;
}

.quote-tag:hover {
  background: var(--color-primary);
  color: #FFF;
  border-color: var(--color-primary);
}

/* ===== Chat ===== */
.chat-section {
  padding: 20px 0 40px;
}

.chat-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

.chat-messages {
  min-height: 300px;
  max-height: 500px;
  overflow-y: auto;
  padding: 20px 0;
}

.message {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-avatar {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
}

.message.master .message-avatar {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #FFF;
}

.message.user .message-avatar {
  background: #E8D5C0;
  color: var(--color-primary);
}

.message-content {
  flex: 1;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 15px;
  line-height: 1.8;
}

.message.user .message-content {
  background: #F0E8D8;
}

.message-content p {
  margin-bottom: 8px;
}

.message-content p:last-child {
  margin-bottom: 0;
}

/* Loading dots */
.loading-dots {
  display: inline-flex;
  gap: 4px;
}

.loading-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* ===== Chat Input ===== */
.chat-input-area {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.chat-input-wrapper {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-sans);
  resize: none;
  background: var(--color-bg-card);
  color: var(--color-text);
  transition: border-color 0.3s;
  line-height: 1.6;
}

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

.ask-button {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #FFF;
  border: none;
  border-radius: 12px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  white-space: nowrap;
  letter-spacing: 2px;
}

.ask-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.ask-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.chat-hint {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 8px;
  text-align: right;
}

/* ===== Classics Section ===== */
.classics-section {
  padding: 40px 0 60px;
  background: #EDE4D3;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 28px;
  letter-spacing: 4px;
}

.classics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.classic-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.3s;
}

.classic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow);
  border-color: var(--color-accent);
}

.classic-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #FFF;
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.classic-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.classic-card p {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ===== Footer ===== */
.footer {
  background: #3D2817;
  color: #C0A880;
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
}

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

.footer-note {
  margin-top: 6px;
  font-size: 12px;
  opacity: 0.7;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero-title { font-size: 36px; letter-spacing: 6px; }
  .nav-links { gap: 16px; }
  .nav-link { font-size: 14px; }
  .chat-input-wrapper { flex-direction: column; }
  .ask-button { width: 100%; padding: 14px; }
  .message-avatar { width: 32px; height: 32px; font-size: 14px; }
  .message-content { font-size: 14px; padding: 12px 14px; }
}

/* ===== Classic Reader (ddj/szbf shared) ===== */
.reader-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

.reader-header {
  text-align: center;
  margin-bottom: 32px;
}

.reader-title {
  font-family: var(--font-serif);
  font-size: 36px;
  color: var(--color-primary);
  letter-spacing: 6px;
  margin-bottom: 8px;
}

.reader-subtitle {
  font-size: 15px;
  color: var(--color-text-light);
}

.chapter-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 8px;
  margin-bottom: 32px;
}

.chapter-btn {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 8px;
  text-align: center;
  cursor: pointer;
  font-size: 13px;
  color: var(--color-primary);
  transition: all 0.3s;
  font-family: var(--font-sans);
}

.chapter-btn:hover, .chapter-btn.active {
  background: var(--color-primary);
  color: #FFF;
  border-color: var(--color-primary);
}

.chapter-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 32px;
  margin-bottom: 24px;
}

.chapter-number {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: 8px;
  letter-spacing: 2px;
}

.chapter-name {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 20px;
  text-align: center;
}

.chapter-text {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 2.2;
  color: var(--color-text);
  white-space: pre-wrap;
  margin-bottom: 20px;
}

.chapter-translation {
  border-top: 1px dashed var(--color-border);
  padding-top: 20px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text-light);
}

.chapter-translation-label {
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 8px;
  font-weight: 600;
}

@media (max-width: 640px) {
  .reader-title { font-size: 28px; }
  .chapter-content { padding: 20px; }
  .chapter-text { font-size: 16px; }
  .chapter-btn { font-size: 12px; padding: 8px 4px; }
}