/* ============================================================
   CSS Reset & Variables
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f5f5f7;
  --card-bg: #ffffff;
  --text: #1d1d1f;
  --text-secondary: #86868b;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --danger: #ff3b30;
  --success: #34c759;
  --warning: #ff9500;
  --border: #e5e5ea;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   Auth Page
   ============================================================ */
.auth-container {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 20px;
}
.auth-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 40px;
  width: 100%; max-width: 400px;
  box-shadow: var(--shadow);
}
.auth-card h1 {
  font-size: 28px; font-weight: 700;
  text-align: center; margin-bottom: 8px;
}
.auth-card .subtitle {
  text-align: center; color: var(--text-secondary);
  margin-bottom: 28px; font-size: 15px;
}
.auth-tabs {
  display: flex; gap: 0; margin-bottom: 24px;
  background: var(--bg); border-radius: var(--radius-sm);
  padding: 3px;
}
.auth-tab {
  flex: 1; text-align: center; padding: 10px;
  border-radius: 8px; cursor: pointer;
  font-weight: 500; font-size: 14px;
  transition: all 0.2s;
  border: none; background: transparent;
  color: var(--text-secondary);
}
.auth-tab.active {
  background: var(--card-bg); color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

/* ============================================================
   Forms
   ============================================================ */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 600;
  margin-bottom: 6px; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.5px;
}
.form-input, .form-select {
  width: 100%; padding: 12px 16px;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: 16px; font-family: var(--font);
  background: var(--card-bg); color: var(--text);
  transition: border-color 0.2s;
  -webkit-appearance: none;
}
.form-input:focus, .form-select:focus {
  outline: none; border-color: var(--accent);
}
.form-input::placeholder { color: #c7c7cc; }
.form-row { display: flex; gap: 12px; }
.form-row > * { flex: 1; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 12px 24px; border: none; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: all 0.2s;
}
.btn-primary { background: var(--accent); color: #fff; width: 100%; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg); color: var(--text); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-block { width: 100%; }

.error-msg {
  color: var(--danger); font-size: 13px;
  margin-top: 4px; display: none;
}
.error-msg.show { display: block; }

/* ============================================================
   App Layout
   ============================================================ */
.app-container { display: none; max-width: 720px; margin: 0 auto; padding: 20px; }
.app-container.active { display: block; }
.auth-container.hidden { display: none; }

.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 0; margin-bottom: 20px;
}
.app-header h1 { font-size: 24px; font-weight: 700; }
.app-header .user-info {
  display: flex; align-items: center; gap: 12px;
  font-size: 14px; color: var(--text-secondary);
}

/* ============================================================
   Navigation Tabs
   ============================================================ */
.nav-tabs {
  display: flex; gap: 4px; margin-bottom: 24px;
  background: var(--card-bg); border-radius: var(--radius);
  padding: 4px; box-shadow: var(--shadow);
}
.nav-tab {
  flex: 1; text-align: center; padding: 12px 8px;
  border-radius: 11px; cursor: pointer;
  font-size: 14px; font-weight: 500;
  transition: all 0.2s; border: none;
  background: transparent; color: var(--text-secondary);
  font-family: var(--font);
}
.nav-tab.active {
  background: var(--accent); color: #fff;
}
.nav-tab .tab-icon { display: block; font-size: 20px; margin-bottom: 2px; }

/* ============================================================
   Cards
   ============================================================ */
.card {
  background: var(--card-bg); border-radius: var(--radius);
  padding: 24px; margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card h2 {
  font-size: 18px; font-weight: 600; margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.card h3 { font-size: 15px; font-weight: 600; margin-bottom: 10px; }

/* ============================================================
   Dashboard Stats
   ============================================================ */
.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px; margin-bottom: 16px;
}
.stat-card {
  background: var(--bg); border-radius: var(--radius-sm);
  padding: 16px; text-align: center;
}
.stat-card .stat-value {
  font-size: 28px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #5856d6);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-card .stat-label {
  font-size: 12px; color: var(--text-secondary);
  margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px;
}
.stat-card.warning .stat-value {
  background: linear-gradient(135deg, var(--warning), var(--danger));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-card.success .stat-value {
  background: linear-gradient(135deg, var(--success), #30b0c7);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.progress-bar {
  height: 10px; background: var(--bg);
  border-radius: 5px; overflow: hidden; margin-top: 8px;
}
.progress-bar .fill {
  height: 100%; border-radius: 5px; transition: width 0.5s ease;
}
.progress-bar .fill.under { background: var(--success); }
.progress-bar .fill.over { background: var(--danger); }
.progress-bar .fill.near { background: var(--warning); }

/* ============================================================
   Food Logging
   ============================================================ */
.method-tabs {
  display: flex; gap: 4px; margin-bottom: 20px;
  background: var(--bg); border-radius: var(--radius-sm); padding: 3px;
}
.method-tab {
  flex: 1; padding: 10px; text-align: center;
  border-radius: 8px; cursor: pointer; font-size: 14px;
  font-weight: 500; border: none; background: transparent;
  color: var(--text-secondary); font-family: var(--font);
  transition: all 0.2s;
}
.method-tab.active {
  background: var(--card-bg); color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.food-log-form { display: none; }
.food-log-form.active { display: block; }

.unit-toggle {
  display: flex; gap: 4px; background: var(--bg);
  border-radius: 6px; padding: 2px;
}
.unit-btn {
  padding: 6px 12px; border: none; border-radius: 5px;
  cursor: pointer; font-size: 12px; font-family: var(--font);
  background: transparent; color: var(--text-secondary);
}
.unit-btn.active { background: var(--card-bg); color: var(--text); font-weight: 600; }

.quick-foods {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px;
}
.quick-food-chip {
  padding: 8px 14px; background: var(--bg);
  border-radius: 20px; font-size: 13px; cursor: pointer;
  border: 1px solid transparent; transition: all 0.2s;
  font-family: var(--font);
}
.quick-food-chip:hover {
  border-color: var(--accent); color: var(--accent);
}

/* ============================================================
   Food List
   ============================================================ */
.food-list { list-style: none; }
.food-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}
.food-item:last-child { border-bottom: none; }
.food-item:hover { background: var(--bg); }
.food-item .food-info { flex: 1; }
.food-item .food-name { font-weight: 500; font-size: 15px; }
.food-item .food-meta {
  font-size: 12px; color: var(--text-secondary); margin-top: 2px;
}
.food-item .food-kcal {
  font-weight: 700; font-size: 16px; margin-left: 12px;
}
.food-item .food-category {
  font-size: 11px; padding: 2px 8px; border-radius: 10px;
  background: var(--bg); color: var(--text-secondary);
  margin-left: 8px;
}

/* ============================================================
   Category Chart (simple bar)
   ============================================================ */
.category-bars { margin-top: 12px; }
.category-bar {
  display: flex; align-items: center; margin-bottom: 8px;
  font-size: 13px;
}
.category-bar .cat-label {
  width: 90px; text-align: right; padding-right: 10px;
  color: var(--text-secondary); flex-shrink: 0;
}
.category-bar .cat-track {
  flex: 1; height: 22px; background: var(--bg);
  border-radius: 11px; overflow: hidden; position: relative;
}
.category-bar .cat-fill {
  height: 100%; border-radius: 11px;
  transition: width 0.4s ease;
  display: flex; align-items: center; padding-left: 10px;
  color: #fff; font-weight: 600; font-size: 12px;
  min-width: 0;
}
.cat-colors-0 { background: #0071e3; }
.cat-colors-1 { background: #5856d6; }
.cat-colors-2 { background: #ff9500; }
.cat-colors-3 { background: #34c759; }
.cat-colors-4 { background: #ff3b30; }
.cat-colors-5 { background: #af52de; }
.cat-colors-6 { background: #30b0c7; }
.cat-colors-7 { background: #ff6482; }
.cat-colors-8 { background: #8e8e93; }

/* ============================================================
   Daily chart bars
   ============================================================ */
.daily-chart { display: flex; align-items: flex-end; gap: 6px; height: 160px; padding-top: 20px; }
.daily-bar-wrap { flex: 1; display: flex; flex-direction: column; align-items: center; height: 100%; }
.daily-bar {
  width: 100%; max-width: 40px; border-radius: 6px 6px 0 0;
  transition: height 0.4s ease; margin-top: auto;
  position: relative;
}
.daily-bar.under-target { background: var(--success); }
.daily-bar.over-target { background: var(--danger); }
.daily-bar-label {
  font-size: 10px; color: var(--text-secondary);
  margin-top: 4px; text-align: center;
}
.target-line {
  position: absolute; left: 0; right: 0;
  border-top: 2px dashed var(--warning);
}
.target-line-label {
  position: absolute; right: 0; top: -18px;
  font-size: 10px; color: var(--warning); font-weight: 600;
}

/* ============================================================
   Settings
   ============================================================ */
.settings-section { margin-bottom: 20px; }
.settings-section h3 {
  font-size: 14px; text-transform: uppercase;
  letter-spacing: 0.5px; color: var(--text-secondary);
  margin-bottom: 12px;
}

/* ============================================================
   Timeline Zoom
   ============================================================ */
.zoom-btn {
  padding: 6px 14px; border: none; border-radius: 6px;
  cursor: pointer; font-size: 13px; font-weight: 500;
  font-family: var(--font); background: transparent;
  color: var(--text-secondary); transition: all 0.15s;
}
.zoom-btn.active { background: var(--accent); color: #fff; }
.zoom-btn:hover:not(.active) { color: var(--text); }

/* ============================================================
   Toast
   ============================================================ */
.toast-container {
  position: fixed; top: 20px; right: 20px;
  z-index: 9999; display: flex; flex-direction: column; gap: 8px;
}
.toast {
  padding: 14px 20px; border-radius: var(--radius-sm);
  color: #fff; font-weight: 500; font-size: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  animation: slideIn 0.3s ease;
  max-width: 360px;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--accent); }
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ============================================================
   Loading
   ============================================================ */
.loading {
  display: inline-block; width: 20px; height: 20px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.6s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 600px) {
  .app-container { padding: 12px; }
  .card { padding: 16px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { flex-direction: column; gap: 0; }
  .stat-card .stat-value { font-size: 22px; }
  .nav-tab { font-size: 12px; padding: 10px 4px; }
  .nav-tab .tab-icon { font-size: 16px; }
}
/* ============================================================
   记录食物 - 入口按钮 & 面板
   ============================================================ */
.log-entry-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px;
  margin-bottom: 16px;
}
.log-entry-btn {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 18px 8px; border: 1.5px solid var(--border);
  border-radius: var(--radius); background: var(--card-bg);
  cursor: pointer; transition: all 0.2s; font-family: var(--font);
}
.log-entry-btn:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.log-entry-btn.active { border-color: var(--accent); background: rgba(0,113,227,0.05); }
.log-entry-btn .entry-icon { font-size: 28px; }
.log-entry-btn .entry-name { font-size: 15px; font-weight: 600; }
.log-entry-btn .entry-desc { font-size: 11px; color: var(--text-secondary); }

.log-panel { animation: fadeSlideIn 0.25s ease; }
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   拍照识别
   ============================================================ */
.photo-dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 28px 16px; text-align: center; cursor: pointer;
  transition: all 0.2s; background: var(--bg);
}
.photo-dropzone:hover { border-color: var(--accent); background: rgba(0,113,227,0.04); }
.photo-hint p { margin-top: 8px; font-size: 14px; font-weight: 500; }
.photo-hint-sub { font-size: 12px !important; color: var(--text-secondary); font-weight: 400 !important; }

.photo-preview-strip {
  display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
}
.photo-thumb {
  position: relative; width: 84px; height: 84px;
  border-radius: var(--radius-sm); overflow: hidden;
  box-shadow: var(--shadow);
}
.photo-thumb img { width: 100%; height: 100%; object-fit: cover; }
.photo-thumb .photo-remove {
  position: absolute; top: 2px; right: 2px;
  width: 20px; height: 20px; border-radius: 50%;
  background: rgba(0,0,0,0.6); color: #fff; border: none;
  font-size: 12px; line-height: 20px; cursor: pointer; padding: 0;
}
.photo-add-more {
  width: 84px; height: 84px; border-radius: var(--radius-sm);
  border: 2px dashed var(--border); background: transparent;
  font-size: 24px; color: var(--text-secondary); cursor: pointer;
}

/* ============================================================
   估算确认卡片
   ============================================================ */
.estimate-loading {
  position: relative; text-align: center; padding: 40px 0 28px;
}
.pulse-ring {
  position: absolute; left: 50%; top: 44px;
  width: 88px; height: 88px; margin-left: -44px; margin-top: -44px;
  border-radius: 50%; border: 3px solid var(--accent);
  opacity: 0; animation: pulseRing 1.6s ease-out infinite;
}
.pulse-ring.delay { animation-delay: 0.8s; }
@keyframes pulseRing {
  0% { transform: scale(0.5); opacity: 0.8; }
  100% { transform: scale(1.4); opacity: 0; }
}
.pulse-core {
  position: relative; font-size: 44px; line-height: 88px;
  animation: pulseCore 1.6s ease-in-out infinite;
}
@keyframes pulseCore {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}
.estimate-loading p {
  margin-top: 12px; font-size: 14px; color: var(--text-secondary);
  animation: breatheText 1.6s ease-in-out infinite;
}
@keyframes breatheText { 0%,100% { opacity: 0.55; } 50% { opacity: 1; } }

.estimate-photo {
  max-width: 220px; max-height: 220px;
  border-radius: var(--radius); box-shadow: var(--shadow);
  object-fit: cover;
}

.est-total {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 18px; border-radius: var(--radius-sm);
  background: var(--bg); margin-top: 4px;
  font-weight: 600;
}
.est-total-value {
  font-size: 22px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #5856d6);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.est-actions { display: flex; gap: 8px; margin-top: 16px; }

/* 实时热量预览 */
.live-kcal {
  display: flex; align-items: baseline; justify-content: flex-end; gap: 6px;
  padding: 10px 16px; margin: 4px 0 14px;
  background: var(--bg); border-radius: var(--radius-sm);
}
.live-kcal-label { font-size: 12px; color: var(--text-secondary); }
.live-kcal-value {
  font-size: 26px; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #5856d6);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.live-kcal-unit { font-size: 12px; color: var(--text-secondary); }

@media (max-width: 600px) {
  .log-entry-btn .entry-desc { display: none; }
  .log-entry-btn { padding: 14px 6px; }
}