/* ==========================================================================
   FollowLoop-Web 多套主題配色系統 (themes.css)
   透過 html[data-theme="xxx"] 覆蓋 :root CSS 變數
   支援深色、淺色 (Light Mode)、高對比等多樣化風格
   ========================================================================== */

/* --------------------------------------------------------------------------
   主題 1: midnight (深邃午夜 - 深色經典高對比)
   -------------------------------------------------------------------------- */
html[data-theme="midnight"] {
  --bg-dark-base: #0b0f19;
  --bg-dark-surface: #111827;
  --bg-card-glass: rgba(17, 24, 39, 0.85);
  --bg-glass-hover: rgba(30, 41, 59, 0.95);
  --bg-panel-deep: rgba(15, 23, 42, 0.7);
  --bg-panel-medium: rgba(15, 23, 42, 0.8);
  --bg-panel-light: rgba(15, 23, 42, 0.6);
  --bg-card-solid: #1e293b;
  --bg-input: rgba(15, 23, 42, 0.85);
  --bg-input-deep: #0f172a;
  --bg-hero-banner: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  --bg-loading: #1e293b;
  --bg-modal-backdrop: rgba(0, 0, 0, 0.8);
  --bg-dropzone: rgba(15, 23, 42, 0.6);
  --bg-dropzone-hover: rgba(99, 102, 241, 0.12);
  --bg-btn-ghost: rgba(255, 255, 255, 0.1);
  --bg-kpi-latest: #0f172a;

  --border-glass: #334155;
  --border-glass-glow: #6366f1;
  --border-card: #334155;
  --border-card-light: #1e293b;
  --border-card-medium: #475569;
  --border-card-strong: #64748b;

  --primary-color: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --gradient-accent: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --gradient-card: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);

  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.35);
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.6);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --text-heading: #ffffff;
  --text-body: #cbd5e1;
  --text-card-content: #f8fafc;
  --text-attr: #e2e8f0;

  --body-bg-a: rgba(99, 102, 241, 0.18);
  --body-bg-b: rgba(236, 72, 153, 0.14);
}

/* --------------------------------------------------------------------------
   主題 2: light-slate (極簡純白 - 淺色清爽亮底 ☀️)
   -------------------------------------------------------------------------- */
html[data-theme="light-slate"] {
  --bg-dark-base: #e2e8f0;
  --bg-dark-surface: #ffffff;
  --bg-card-glass: #ffffff;
  --bg-glass-hover: #f8fafc;
  --bg-panel-deep: #f8fafc;
  --bg-panel-medium: #f1f5f9;
  --bg-panel-light: #ffffff;
  --bg-card-solid: #ffffff;
  --bg-input: #ffffff;
  --bg-input-deep: #f8fafc;
  --bg-hero-banner: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  --bg-loading: #ffffff;
  --bg-modal-backdrop: rgba(15, 23, 42, 0.6);
  --bg-dropzone: #f8fafc;
  --bg-dropzone-hover: #e0e7ff;
  --bg-btn-ghost: #e2e8f0;
  --bg-kpi-latest: #f1f5f9;

  --border-glass: #94a3b8;
  --border-glass-glow: #4f46e5;
  --border-card: #cbd5e1;
  --border-card-light: #cbd5e1;
  --border-card-medium: #94a3b8;
  --border-card-strong: #64748b;

  --primary-color: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #3730a3;
  --gradient-accent: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);

  --shadow-glow: 0 4px 20px rgba(79, 70, 229, 0.2);
  --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.12);

  --text-main: #0f172a;
  --text-muted: #334155;
  --text-subtle: #475569;
  --text-heading: #0f172a;
  --text-body: #1e293b;
  --text-card-content: #0f172a;
  --text-attr: #0f172a;

  --body-bg-a: rgba(99, 102, 241, 0.12);
  --body-bg-b: rgba(59, 130, 246, 0.10);
}

/* --------------------------------------------------------------------------
   主題 3: emerald-dark (翡翠極光 - 明亮綠藍高對比)
   -------------------------------------------------------------------------- */
html[data-theme="emerald-dark"] {
  --bg-dark-base: #021a1a;
  --bg-dark-surface: #062626;
  --bg-card-glass: rgba(6, 38, 38, 0.9);
  --bg-glass-hover: rgba(12, 54, 54, 0.95);
  --bg-panel-deep: #062626;
  --bg-panel-medium: #093333;
  --bg-panel-light: #052020;
  --bg-card-solid: #093333;
  --bg-input: #041d1d;
  --bg-input-deep: #021414;
  --bg-hero-banner: linear-gradient(135deg, #093333 0%, #041d1d 100%);
  --bg-loading: #093333;
  --bg-modal-backdrop: rgba(0, 15, 15, 0.85);
  --bg-dropzone: #041d1d;
  --bg-dropzone-hover: rgba(16, 185, 129, 0.15);
  --bg-btn-ghost: rgba(16, 185, 129, 0.15);
  --bg-kpi-latest: #041d1d;

  --border-glass: #134e4a;
  --border-glass-glow: #10b981;
  --border-card: #134e4a;
  --border-card-light: #0d9488;
  --border-card-medium: #14b8a6;
  --border-card-strong: #2dd4bf;

  --primary-color: #10b981;
  --primary-light: #34d399;
  --primary-dark: #059669;
  --gradient-accent: linear-gradient(135deg, #059669 0%, #10b981 50%, #06b6d4 100%);
  --gradient-card: linear-gradient(145deg, #093333 0%, #041d1d 100%);

  --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.35);
  --shadow-card: 0 10px 30px -5px rgba(0, 20, 20, 0.7);

  --text-main: #f0fdf4;
  --text-muted: #6ee7b7;
  --text-subtle: #34d399;
  --text-heading: #ffffff;
  --text-body: #a7f3d0;
  --text-card-content: #ecfdf5;
  --text-attr: #a7f3d0;

  --body-bg-a: rgba(16, 185, 129, 0.2);
  --body-bg-b: rgba(6, 182, 212, 0.15);
}

/* --------------------------------------------------------------------------
   主題 4: amber-glow (琥珀香檳 - 暖金亮麗高質感)
   -------------------------------------------------------------------------- */
html[data-theme="amber-glow"] {
  --bg-dark-base: #1c130b;
  --bg-dark-surface: #2a1d10;
  --bg-card-glass: rgba(42, 29, 16, 0.9);
  --bg-glass-hover: rgba(58, 40, 22, 0.95);
  --bg-panel-deep: #2a1d10;
  --bg-panel-medium: #362514;
  --bg-panel-light: #22170d;
  --bg-card-solid: #362514;
  --bg-input: #22170d;
  --bg-input-deep: #170f08;
  --bg-hero-banner: linear-gradient(135deg, #362514 0%, #170f08 100%);
  --bg-loading: #362514;
  --bg-modal-backdrop: rgba(15, 8, 3, 0.85);
  --bg-dropzone: #22170d;
  --bg-dropzone-hover: rgba(245, 158, 11, 0.15);
  --bg-btn-ghost: rgba(245, 158, 11, 0.15);
  --bg-kpi-latest: #170f08;

  --border-glass: #78350f;
  --border-glass-glow: #f59e0b;
  --border-card: #78350f;
  --border-card-light: #b45309;
  --border-card-medium: #d97706;
  --border-card-strong: #f59e0b;

  --primary-color: #f59e0b;
  --primary-light: #fbbf24;
  --primary-dark: #d97706;
  --gradient-accent: linear-gradient(135deg, #d97706 0%, #f59e0b 50%, #f97316 100%);
  --gradient-card: linear-gradient(145deg, #362514 0%, #170f08 100%);

  --shadow-glow: 0 0 25px rgba(245, 158, 11, 0.35);
  --shadow-card: 0 10px 30px -5px rgba(20, 10, 0, 0.7);

  --text-main: #fffbeb;
  --text-muted: #fcd34d;
  --text-subtle: #fbbf24;
  --text-heading: #ffffff;
  --text-body: #fde68a;
  --text-card-content: #fffbeb;
  --text-attr: #fde68a;

  --body-bg-a: rgba(245, 158, 11, 0.2);
  --body-bg-b: rgba(249, 115, 22, 0.15);
}

/* --------------------------------------------------------------------------
   Body 背景 — 根據主題套用漸層
   -------------------------------------------------------------------------- */
html[data-theme] body {
  background-color: var(--bg-dark-base);
  background-image:
    radial-gradient(circle at 15% 15%, var(--body-bg-a) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, var(--body-bg-b) 0%, transparent 45%);
  background-attachment: fixed;
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   Admin Panel — 側面板樣式與主題卡片
   -------------------------------------------------------------------------- */
#admin-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1998;
  display: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}
#admin-panel-backdrop.active {
  display: block;
  opacity: 1;
}

#admin-panel {
  position: fixed;
  top: 0;
  right: -360px;
  width: 340px;
  height: 100vh;
  background: var(--bg-dark-surface);
  border-left: 2px solid var(--border-glass-glow);
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.6);
  z-index: 1999;
  display: flex;
  flex-direction: column;
  padding: 28px 24px;
  gap: 24px;
  transition: right 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  color: var(--text-main);
}
#admin-panel.active {
  right: 0;
}

.admin-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 18px;
}
.admin-panel-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}
.admin-panel-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  cursor: pointer;
  transition: color 0.18s;
}
.admin-panel-close:hover {
  color: var(--text-main);
}

.admin-section-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* --------------------------------------------------------------------------
   主題選擇卡片
   -------------------------------------------------------------------------- */
.theme-cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.theme-card {
  border: 2px solid var(--border-glass);
  border-radius: 12px;
  padding: 14px;
  cursor: pointer;
  transition: all 0.22s ease;
  background: var(--bg-card-glass);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.theme-card:hover {
  border-color: var(--border-glass-glow);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.theme-card.active {
  border-color: var(--primary-color);
  box-shadow: 0 0 16px var(--primary-color);
}

.theme-card-preview {
  height: 44px;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  gap: 3px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}
.theme-preview-bar {
  flex: 1;
}

.theme-card-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
}
.theme-card-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.4;
}

/* 齒輪按鈕 */
.btn-admin-panel {
  background: var(--bg-btn-ghost);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}
.btn-admin-panel:hover {
  background: var(--primary-color);
  border-color: var(--primary-light);
  color: #ffffff;
  transform: rotate(30deg);
}

/* Admin Panel 系統資訊區塊 */
.admin-info-block {
  background: var(--bg-panel-medium);
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  padding: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.admin-info-block b {
  color: var(--text-main);
}