/* ============================================================
   拖延症对抗网站 - 前端样式
   设计理念：简洁、克制、低视觉噪音
   色彩：暖白底 + 深灰字 + 单一强调色（砖红）
   自适应：移动优先，断点 480/768/1024
   ============================================================ */

/* ---- Reset & Base ---- */

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

:root {
  --bg: #FAFAF8;
  --card: #FFFFFF;
  --text: #2C2C2C;
  --text-secondary: #888888;
  --accent: #C44D4D;       /* 砖红 — 行动感 */
  --accent-soft: #F5E6E6;
  --border: #E8E8E4;
  --success: #5CA65C;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  --max-width: 640px;
}

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---- Layout ---- */

.app {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 100px;
}

/* ---- Header ---- */

.header {
  text-align: center;
  padding: 32px 0 24px;
}

.header h1 {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* ---- Tab Bar ---- */

.tab-bar {
  display: flex;
  gap: 4px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  flex: 1;
  min-width: 0;
  padding: 10px 8px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: var(--font);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.tab-btn.active {
  background: var(--text);
  color: #fff;
}

.tab-btn:not(.active):hover {
  background: var(--accent-soft);
}

/* ---- Cards ---- */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

/* ---- Today's First Step（首页核心） ---- */

.first-step {
  text-align: center;
  padding: 32px 20px;
}

.first-step .big-question {
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 24px;
  color: var(--text);
}

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

.micro-input {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 1rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
}

.micro-input:focus {
  border-color: var(--accent);
}

.micro-input::placeholder {
  color: #BBBBBB;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

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

.btn-primary:hover { opacity: 0.9; }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  background: var(--accent-soft);
  color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 12px;
}

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

.btn-block { width: 100%; }

/* ---- Task List ---- */

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.task-item:last-child { border-bottom: none; }

.task-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
}

.task-status-dot.ready { background: var(--border); }
.task-status-dot.started { background: var(--accent); animation: pulse 1.5s infinite; }
.task-status-dot.done { background: var(--success); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.task-content { flex: 1; min-width: 0; }

.task-title {
  font-size: 0.95rem;
  font-weight: 500;
  word-break: break-word;
}

.task-original {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.task-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.task-actions .btn { padding: 6px 12px; font-size: 0.8rem; }

/* ---- 5秒法则倒计时 ---- */

.countdown-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.3s;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.countdown-box {
  background: var(--card);
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  min-width: 280px;
}

.countdown-number {
  font-size: 5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
  animation: countPop 1s steps(1);
}

@keyframes countPop {
  0% { transform: scale(1.2); opacity: 0.7; }
  100% { transform: scale(1); opacity: 1; }
}

.countdown-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ---- Diary ---- */

.diary-form textarea {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 0.95rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  resize: vertical;
  min-height: 120px;
  outline: none;
  transition: border-color 0.2s;
}

.diary-form textarea:focus { border-color: var(--accent); }

.mood-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 12px 0;
}

.mood-btn {
  padding: 6px 14px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: var(--card);
  font-size: 0.82rem;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.2s;
}

.mood-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.media-upload-area {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  margin: 12px 0;
}

.media-upload-area:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.media-preview {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.media-thumb {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 1px solid var(--border);
}

.media-file-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-align: center;
  padding: 4px;
  word-break: break-all;
}

/* ---- Streak ---- */

.streak-display {
  text-align: center;
  padding: 24px 0;
}

.streak-number {
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.streak-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

.streak-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---- Empty State ---- */

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}

.empty-state .emoji {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---- Toast ---- */

.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: #fff;
  padding: 12px 24px;
  border-radius: 24px;
  font-size: 0.88rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: all 0.3s;
  z-index: 200;
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- Stats Grid ---- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-item {
  text-align: center;
  padding: 12px 8px;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---- Responsive ---- */

@media (max-width: 480px) {
  .app { padding: 16px 14px 100px; }
  .header h1 { font-size: 1.2rem; }
  .card { padding: 16px; }
  .first-step { padding: 24px 12px; }
  .countdown-box { padding: 36px 24px; min-width: 260px; }
  .countdown-number { font-size: 4rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 769px) {
  .app { padding: 40px 32px 100px; }
  .header { padding: 48px 0 32px; }
  .header h1 { font-size: 1.6rem; }
  .stats-grid { grid-template-columns: repeat(6, 1fr); }
}

/* ---- Scrollbar ---- */

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ---- Loading spinner ---- */

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ---- Section divider ---- */

.section-divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
  opacity: 0.5;
}