/* ==========================================================================
   FollowLoop-Web 全局現代暗色調/玻璃擬物化 (Glassmorphism) 主題樣式 (main.css)
   ========================================================================== */

:root {
  /* 品牌與調色盤 (HSL & Modern Gradients) */
  --bg-dark-base: #0b0f19;
  --bg-dark-surface: #111827;
  --bg-card-glass: rgba(17, 24, 39, 0.75);
  --bg-glass-hover: rgba(30, 41, 59, 0.85);
  
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-glow: rgba(99, 102, 241, 0.4);

  /* 主色與 Accent 漸層 */
  --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, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
  
  /* 功能色 */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  /* 文字顏色 */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;

  /* 視覺細節 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --backdrop-blur: blur(16px);

  /* 字型與轉場 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Body 背景漸層 (預設 midnight) */
  --body-bg-a: rgba(99, 102, 241, 0.15);
  --body-bg-b: rgba(236, 72, 153, 0.12);

  /* 語義化面板/卡片/輸入背景 (供主題覆蓋) */
  --bg-panel-deep: rgba(15, 23, 42, 0.5);
  --bg-panel-medium: rgba(15, 23, 42, 0.6);
  --bg-panel-light: rgba(15, 23, 42, 0.4);
  --bg-card-solid: rgba(30, 41, 59, 0.6);
  --bg-input: rgba(15, 23, 42, 0.7);
  --bg-input-deep: rgba(15, 23, 42, 0.9);
  --bg-hero-banner: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
  --bg-loading: rgba(30, 41, 59, 0.85);
  --bg-modal-backdrop: rgba(0, 0, 0, 0.75);
  --bg-dropzone: rgba(15, 23, 42, 0.4);
  --bg-dropzone-hover: rgba(99, 102, 241, 0.08);
  --bg-btn-ghost: rgba(255, 255, 255, 0.08);
  --bg-kpi-latest: rgba(15, 23, 42, 0.65);

  /* 語義化邊框 */
  --border-card: rgba(255, 255, 255, 0.08);
  --border-card-light: rgba(255, 255, 255, 0.06);
  --border-card-medium: rgba(255, 255, 255, 0.12);
  --border-card-strong: rgba(255, 255, 255, 0.15);

  /* 語義化文字 (非 CSS 變數引用的硬編碼色) */
  --text-heading: #f8fafc;
  --text-body: #cbd5e1;
  --text-card-content: #f8fafc;
  --text-attr: #e2e8f0;
}

/* 基礎重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  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);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* 滾動條美化 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark-base);
}
::-webkit-scrollbar-thumb {
  background: var(--border-glass-glow);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* 全局 Layout 容器 */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 24px;
}

/* Header 導覽列 */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 24px;
  background: var(--bg-card-glass);
  backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  margin-bottom: 28px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo .logo-icon {
  width: 42px;
  height: 42px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.brand-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-heading);
}

.brand-badge {
  font-size: 0.75rem;
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
  border: 1px solid var(--border-glass-glow);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 8px;
}

/* Tab 頁籤切換 */
.nav-tabs {
  display: flex;
  gap: 8px;
  background: var(--bg-panel-medium);
  padding: 5px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.nav-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-tab-btn.active {
  background: var(--gradient-accent);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.badge-count {
  background: #ef4444;
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

/* 通用切頁 Section */
.tab-content-section {
  display: none;
  animation: fadeIn 0.35s ease-out forwards;
}

.tab-content-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Toast 提示系統 */
.toast-container {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast-item {
  min-width: 300px;
  padding: 14px 20px;
  background: var(--bg-dark-surface);
  border-left: 4px solid var(--primary-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  backdrop-filter: var(--backdrop-blur);
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast-item.success { border-left-color: var(--color-success); }
.toast-item.warning { border-left-color: var(--color-warning); }
.toast-item.danger { border-left-color: var(--color-danger); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}