/* ============================================================
   情侣深度对话 - Couple Deep Talk
   浪漫主题样式
   ============================================================ */

/* ==================== CSS Variables ==================== */
:root {
  --pink: #ff6b9d;
  --pink-light: #ffa3c4;
  --purple: #a29bfe;
  --purple-dark: #6c5ce7;
  --sunset-1: #ff9a9e;
  --sunset-2: #fad0c4;
  --sunset-3: #ffecd2;
  --coral: #e17055;
  --teal: #4ecdc4;
  --blue: #74b9ff;
  --yellow: #fdcb6e;
  --green: #55efc4;
  --bg: linear-gradient(135deg, #2d1b69, #1a1a2e, #16213e);
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: #f0e6ff;
  --text-secondary: #b8a9d4;
  --text-muted: #7a6b99;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius: 20px;
  --radius-sm: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* ==================== Hearts Canvas ==================== */
#hearts-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ==================== Header ==================== */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 26, 46, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 12px 20px;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
}

.header-left h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--pink), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-subtitle {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.key-badge {
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(255, 107, 157, 0.15);
  color: var(--pink-light);
  border: 1px solid rgba(255, 107, 157, 0.25);
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: scale(1.05);
}

.partner-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding-top: 8px;
  font-size: 0.9rem;
}

.partner-name {
  color: var(--pink-light);
  font-weight: 500;
}

.partner-heart {
  animation: partnerPulse 2s ease-in-out infinite;
  font-size: 1.2rem;
}

@keyframes partnerPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}

/* ==================== Main ==================== */
#app-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  position: relative;
  z-index: 1;
}

/* ==================== Progress ==================== */
#progress-section {
  margin-bottom: 24px;
}

.progress-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--pink), var(--purple), var(--teal));
  border-radius: 10px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-text {
  text-align: center;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==================== Empty Banner ==================== */
.empty-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  animation: fadeInUp 0.6s ease;
}

.empty-icon {
  font-size: 4rem;
  animation: float 3s ease-in-out infinite;
  margin-bottom: 20px;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.empty-banner h2 {
  font-size: 1.8rem;
  margin-bottom: 8px;
  color: var(--text);
}

.empty-banner p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 1rem;
}

.empty-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 30px;
  max-width: 400px;
}

.empty-categories span {
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  transition: var(--transition);
}

.empty-categories span:hover {
  background: rgba(255, 107, 157, 0.15);
  border-color: rgba(255, 107, 157, 0.3);
  color: var(--pink-light);
}

/* ==================== Topics Grid ==================== */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  animation: fadeInUp 0.5s ease;
}

/* ==================== Topic Card ==================== */
.topic-card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg,
    rgba(255, 107, 157, 0.05),
    rgba(162, 155, 254, 0.05)
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(255, 107, 157, 0.15);
  border-color: rgba(255, 107, 157, 0.3);
}

.topic-card:hover::before {
  opacity: 1;
}

.topic-card.answered {
  border-color: rgba(85, 239, 196, 0.3);
}

.topic-card.answered::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--green);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.topic-number {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 1.2rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.06);
  font-family: 'SF Mono', 'Monaco', monospace;
}

.answer-dot {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.7rem;
  font-weight: bold;
  z-index: 1;
}

.topic-category {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  color: #fff;
  font-weight: 500;
  align-self: flex-start;
  letter-spacing: 0.5px;
}

.topic-question {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
  margin-top: 4px;
}

.topic-guide {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
  flex: 1;
}

.topic-answers-preview {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 10px;
  margin-top: 4px;
}

/* ==================== Buttons ==================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--pink), var(--purple-dark));
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255, 107, 157, 0.3);
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 107, 157, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
}

#topic-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

/* ==================== Loading ==================== */
#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26, 26, 46, 0.9);
  backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loader {
  text-align: center;
}

.loader-heart {
  font-size: 3rem;
  animation: heartBeat 1s ease-in-out infinite;
}

@keyframes heartBeat {
  0%, 100% { transform: scale(1); }
  15% { transform: scale(1.3); }
  30% { transform: scale(1); }
  45% { transform: scale(1.2); }
  60% { transform: scale(1); }
}

.loader p {
  margin-top: 16px;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ==================== Modals ==================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: linear-gradient(145deg, #1e1e3a, #16213e);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 500px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.3s ease;
}

.modal-compare-content {
  max-width: 700px;
}

.modal-answer-content {
  max-width: 550px;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h2 {
  font-size: 1.3rem;
  color: var(--text);
}

.btn-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-close:hover {
  background: rgba(255, 107, 157, 0.2);
  border-color: rgba(255, 107, 157, 0.3);
  color: var(--pink);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}

/* ==================== Form Elements ==================== */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.form-group small {
  display: block;
  margin-top: 4px;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--pink);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23b8a9d4' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

.form-group select option {
  background: #1e1e3a;
  color: var(--text);
}

/* ==================== Answer Modal ==================== */
.answer-topic-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.5;
}

.answer-topic-guide {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

/* ==================== Compare Modal ==================== */
.compare-question {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.compare-guide {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.compare-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: start;
}

.compare-col {
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  padding: 16px;
  border: 1px solid rgba(255,255,255,0.08);
}

.compare-name {
  font-weight: 600;
  color: var(--pink-light);
  margin-bottom: 10px;
  font-size: 0.95rem;
}

.compare-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
}

.compare-divider {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: 30px;
}

/* ==================== History ==================== */
.history-day {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 12px;
}

.history-date {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.history-stats {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.history-progress-mini {
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  margin-bottom: 10px;
  overflow: hidden;
}

.history-progress-mini-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--pink), var(--purple));
  border-radius: 2px;
}

.history-topics-mini {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.history-tag {
  padding: 3px 10px;
  border-radius: 12px;
  background: rgba(255,255,255,0.06);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.history-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==================== Toast ==================== */
#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transform: translateX(120%);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.4s ease;
  pointer-events: auto;
  max-width: 350px;
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast-info {
  background: rgba(116, 185, 255, 0.2);
  border: 1px solid rgba(116, 185, 255, 0.3);
  color: #74b9ff;
}

.toast-success {
  background: rgba(85, 239, 196, 0.2);
  border: 1px solid rgba(85, 239, 196, 0.3);
  color: #55efc4;
}

.toast-error {
  background: rgba(255, 107, 107, 0.2);
  border: 1px solid rgba(255, 107, 107, 0.3);
  color: #ff6b6b;
}

/* ==================== Responsive ==================== */
@media (max-width: 600px) {
  html { font-size: 15px; }
  
  #app-main { padding: 12px; }
  
  .header-inner { padding: 0 4px; }
  .header-left h1 { font-size: 1.3rem; }
  
  .topics-grid { grid-template-columns: 1fr; gap: 12px; }
  
  .modal-content { padding: 18px; width: 94%; }
  
  .compare-container { grid-template-columns: 1fr; }
  .compare-divider { padding-top: 0; justify-content: center; }
  
  .empty-banner { padding: 40px 16px; }
  .empty-banner h2 { font-size: 1.5rem; }
  .empty-icon { font-size: 3rem; }
  
  #toast-container { top: 10px; right: 10px; left: 10px; }
  .toast { max-width: 100%; }
}

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

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

/* ==================== Selection ==================== */
::selection {
  background: rgba(255, 107, 157, 0.3);
  color: #fff;
}