/* ========== CSS 變數系統 ========== */
:root {
  /* 主色調 */
  --color-primary: #dc3545;
  --color-primary-dark: #c82333;
  --color-secondary: #0a66c2;
  --color-secondary-dark: #054399;
  --color-accent: #ffc107;
  --color-success: #28a745;
  
  /* 中性色階 */
  --color-text: #000000;
  --color-text-secondary: #333333;
  --color-text-tertiary: #666666;
  --color-text-muted: #888888;
  --color-border: #e5e5e5;
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #f0f0f0;
  
  /* 漸層 */
  --gradient-dark: linear-gradient(135deg, #000 0%, #333 100%);
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, #ff6b7a 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(248,249,250,0.8) 100%);
  
  /* 間距系統（8px 基準）*/
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 40px;
  
  /* 字體大小 */
  --font-xs: 14px;
  --font-sm: 15px;
  --font-base: 16px;
  --font-md: 17px;
  --font-lg: 18px;
  --font-xl: 24px;
  --font-2xl: 26px;
  --font-3xl: 36px;
  
  /* 陰影 */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 5px 15px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --shadow-xl: 0 15px 35px rgba(0,0,0,0.15);
  
  /* 圓角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 12px;
  --radius-full: 50%;
  
  /* 過渡 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* ========== 全局樣式 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { background-color: var(--color-bg-primary); color: var(--color-text); font-family: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', 'Helvetica Neue', sans-serif; line-height: 1.75; font-size: var(--font-lg); }
body { padding: 0; margin: 0; }
.container-threads { max-width: 900px; margin: 0 auto; padding: 0 var(--spacing-md); }
@media (max-width: 768px) { .container-threads { max-width: 100%; padding: 0 var(--spacing-sm); } }

/* ========== 頁頭 ========== */


/* ========== 主標題區 ========== */
.hero-section { padding: var(--spacing-lg) 0; margin-bottom: var(--spacing-xl); border-bottom: 1px solid var(--color-border); }
.hero-title { font-size: var(--font-3xl); font-weight: 900; line-height: 1.3; margin-bottom: 20px; letter-spacing: -0.5px; color: var(--color-primary); text-shadow: 0 2px 4px rgba(220,53,69,0.1); }
.hero-description { font-size: var(--font-lg); color: var(--color-text-secondary); line-height: 1.75; margin-bottom: 20px; }
.hero-highlight { background: var(--gradient-glass); border-left: 5px solid var(--color-primary); padding: var(--spacing-md) 20px; margin: 20px 0; font-size: var(--font-md); font-weight: 500; color: var(--color-text); line-height: 1.75; box-shadow: var(--shadow-sm); transition: all var(--transition-base); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.hero-highlight:hover { box-shadow: var(--shadow-md); transform: translateX(4px); }

/* ========== 團結宣言區 ========== */
.unity-section { background: var(--gradient-dark); color: #fff; padding: 30px; border-radius: var(--radius-xl); margin: var(--spacing-xl) 0; box-shadow: var(--shadow-xl); position: relative; overflow: hidden; }
.unity-section::before { content: ''; position: absolute; top: -50%; right: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(255,193,7,0.3) 0%, transparent 60%); animation: rotate 10s linear infinite; pointer-events: none; }
@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.unity-title { font-size: var(--font-xl); font-weight: 900; color: var(--color-accent); margin-bottom: 15px; border-bottom: 1px solid var(--color-accent); padding-bottom: 10px; position: relative; z-index: 1; }
.unity-content { font-size: var(--font-lg); line-height: 1.75; position: relative; z-index: 1; }
.unity-item { margin-bottom: 10px; display: flex; align-items: center; gap: 10px; transition: var(--transition-base); }
.unity-item:hover { transform: translateX(8px); }
.unity-item i { color: var(--color-accent); }

/* ========== 區塊標題 ========== */
principles-section .section-title { color: var(--color-primary); }

/* ========== 表格樣式 ========== */
.table-container { overflow-x: auto; margin-bottom: var(--spacing-xl); border-radius: var(--radius-lg); }
.table-threads { width: 100%; border-collapse: collapse; font-size: var(--font-base); }
.table-threads thead { background: var(--gradient-glass); border-bottom: 2px solid var(--color-border); }
.table-threads th { padding: var(--spacing-md) var(--spacing-sm); text-align: center; font-weight: 600; color: var(--color-text); border-right: 1px solid var(--color-border); font-size: var(--font-md); }
.table-threads th:last-child { border-right: none; }
.table-threads td { padding: 14px var(--spacing-sm); border-bottom: 1px solid var(--color-border); border-right: 1px solid var(--color-border); vertical-align: middle; font-size: var(--font-base); text-align: center; transition: var(--transition-fast); }
.table-threads td:last-child { border-right: none; }
.table-threads .fa-star, .table-threads .fa-star-half-alt { color: var(--color-accent); margin-right: 2px; }
.table-threads .cell-left { text-align: left; }
.table-threads tbody tr { transition: all var(--transition-base); }
.table-threads tbody tr:hover { background-color: var(--color-bg-secondary); transform: scale(1.005); box-shadow: var(--shadow-sm); }
.table-threads a { color: var(--color-secondary); text-decoration: none; font-weight: 600; transition: var(--transition-base); }
.table-threads a:hover { text-decoration: underline; color: var(--color-secondary-dark); }

.table-type-badge { display: inline-block; padding: 4px 10px; border-radius: var(--radius-sm); font-size: var(--font-xs); font-weight: 600; background-color: var(--color-border); color: var(--color-text); white-space: nowrap; transition: var(--transition-base); }
.table-type-badge:hover { transform: scale(1.05); }
.table-type-badge.website { background-color: #e2e3ff; color: #004085; }
.table-type-badge.platform { background-color: #d1ecf1; color: #0c5460; }
.table-type-badge.page { background-color: #d4edda; color: #155724; }

/* ========== 文章區域卡片樣式 ========== */
.article-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin-bottom: var(--spacing-xl); }
.article-card { border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; transition: all var(--transition-smooth); background: var(--color-bg-primary); position: relative; overflow: hidden; }
.article-card::before { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 3px; background: var(--gradient-primary); transition: left var(--transition-smooth); }
.article-card:hover { border-color: var(--color-secondary); box-shadow: var(--shadow-md); transform: translateY(-5px); }
.article-card:hover::before { left: 0; }
.article-title { font-weight: 700; font-size: var(--font-lg); margin-bottom: 15px; color: var(--color-text); line-height: 1.5; height: 54px; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; line-clamp: 2; }
.article-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; }

/* ========== 分享按鈕樣式 ========== */
.copy-btn { padding: 6px var(--spacing-sm); font-size: var(--font-xs); font-weight: 600; border-radius: var(--radius-sm); background-color: var(--color-bg-primary); border: 1px solid var(--color-secondary); color: var(--color-secondary); cursor: pointer; transition: all var(--transition-base); white-space: nowrap; }
.copy-btn:hover { background-color: var(--color-secondary); color: var(--color-bg-primary); transform: scale(1.05); box-shadow: var(--shadow-sm); }
.copy-btn:active { transform: scale(0.95); }
.copy-btn.success { background-color: #d4edda; border-color: var(--color-success); color: #155724; animation: successPulse 0.3s ease; }
@keyframes successPulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.1); } }

/* ========== 前往按鈕樣式 ========== */
.goto-btn { display: inline-block; padding: 6px var(--spacing-sm); font-size: var(--font-xs); font-weight: 700; border-radius: var(--radius-sm); background-color: #eef6ff; border: 1px solid var(--color-secondary); color: var(--color-secondary) !important; text-decoration: none !important; transition: all var(--transition-smooth); }
.goto-btn:hover { background-color: var(--color-secondary); color: var(--color-bg-primary) !important; transform: translateY(-2px); box-shadow: 0 4px 8px rgba(10, 102, 194, 0.2); }
.goto-btn.clicked { background-color: var(--color-primary); border-color: var(--color-primary); color: var(--color-bg-primary) !important; animation: pulse-red 0.5s ease-out; }
@keyframes pulse-red { 0% { transform: scale(1); } 50% { transform: scale(1.1); } 100% { transform: scale(1); } }

/* ========== 群組清單 ========== */
.group-list { display: flex; flex-direction: column; gap: var(--spacing-sm); margin-bottom: var(--spacing-xl); }
.group-item { display: flex; align-items: center; padding: 15px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background-color: var(--color-bg-primary); transition: all var(--transition-smooth); }
.group-item:hover { background-color: var(--color-bg-secondary); border-color: #ccc; transform: translateX(8px); box-shadow: var(--shadow-sm); }
.group-icon { width: 50px; height: 50px; display: flex; align-items: center; justify-content: center; background-color: var(--color-bg-tertiary); border-radius: var(--radius-lg); margin-right: 15px; font-size: var(--font-xl); flex-shrink: 0; transition: var(--transition-base); }
.group-item:hover .group-icon { transform: rotate(5deg) scale(1.1); }
.icon-tg { color: #0088cc; }
.icon-line { color: #00b900; }
.icon-fb { color: #1877f2; }
.group-content { flex: 1; min-width: 0; }
.group-name { font-weight: 700; font-size: var(--font-lg); color: var(--color-text); margin-bottom: 4px; }
.group-description { font-size: var(--font-sm); color: var(--color-text-tertiary); line-height: 1.5; }
.group-link { display: inline-block; padding: 10px 20px; background-color: var(--color-secondary); color: var(--color-bg-primary); text-decoration: none; border-radius: 6px; font-size: var(--font-sm); font-weight: 700; transition: all var(--transition-base); white-space: nowrap; margin-left: auto; flex-shrink: 0; }
.group-link:hover { background-color: var(--color-secondary-dark); color: var(--color-bg-primary); transform: scale(1.05); box-shadow: var(--shadow-md); }

/* ========== 政治贏家原理區 ========== */
.principles-section { padding: 0 0 var(--spacing-xl) 0; margin-bottom: var(--spacing-xl); }
.principle-card { background: var(--gradient-glass); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 25px; margin-bottom: 30px; box-shadow: var(--shadow-sm); transition: var(--transition-base); }
.principle-card:hover { box-shadow: var(--shadow-md); }
.formula-item { font-family: 'Courier New', monospace; font-weight: 700; background: var(--color-bg-primary); padding: 10px 15px; border-radius: 6px; border: 1px solid #ddd; margin-bottom: 10px; display: block; transition: var(--transition-base); }
.formula-item:hover { border-color: var(--color-secondary); transform: translateX(4px); }
.formula-label { color: var(--color-primary); margin-right: 10px; font-weight: 900; }
.principle-truth { margin: 20px 0; font-size: 19px; line-height: 1.6; border-left: 4px solid var(--color-text); padding-left: 15px; }
.principle-iron-law pre { white-space: pre-wrap; font-family: inherit; }

/* ========== 頁尾 ========== */
.footer { padding: var(--spacing-xl) 0 var(--spacing-2xl); margin-top: var(--spacing-2xl); color: var(--color-text-muted); border-top: 1px solid var(--color-border); }
.footer-top { margin-bottom: 15px; text-align: center; }
.footer-text { font-size: var(--font-sm); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
.footer-left { font-size: var(--font-xs); }
.footer-right { display: flex; gap: 20px; }
.footer-right a { font-size: var(--font-xs); color: var(--color-text-muted); text-decoration: none; transition: color var(--transition-base); }
.footer-right a:hover { color: var(--color-primary); }
.visitor-link { color: var(--color-text-muted); text-decoration: none; font-weight: 600; transition: var(--transition-base); }
.visitor-link:hover { text-decoration: underline; color: var(--color-primary); }

/* ========== 響應式設計 ========== */
@media (max-width: 768px) { .footer-bottom { flex-direction: column; text-align: center; } }
@media (max-width: 640px) {
  .hero-title { font-size: 28px; }
  .group-item { flex-direction: column; align-items: flex-start; }
  .group-link { margin-left: 0; margin-top: var(--spacing-sm); width: 100%; text-align: center; }
  .hide-mobile { display: none !important; }
}

/* ========== 特殊樣式 ========== */
.wing-enemy { color: var(--color-success); font-weight: bold; }
.wing-hero { background-color: var(--color-accent); color: var(--color-text); padding: 0 4px; border-radius: var(--radius-sm); font-weight: bold; }

/* ========== 手風琴樣式 ========== */
.custom-accordion .accordion-item { border: none; background: transparent; margin-bottom: var(--spacing-md); }
.custom-accordion .accordion-button { background: var(--gradient-glass); border: 1px solid var(--color-border); border-radius: var(--radius-lg) !important; padding: var(--spacing-md) var(--spacing-lg); font-weight: 700; font-size: var(--font-lg); color: var(--color-text); box-shadow: var(--shadow-sm); transition: all var(--transition-base); }
.custom-accordion .accordion-button:not(.collapsed) { background: var(--gradient-dark); color: var(--color-accent); box-shadow: var(--shadow-md); border-bottom-left-radius: 0 !important; border-bottom-right-radius: 0 !important; }
.custom-accordion .accordion-button::after { transition: transform var(--transition-base); }
.custom-accordion .accordion-button:not(.collapsed)::after { filter: brightness(0) invert(1); }
.custom-accordion .accordion-button:focus { box-shadow: none; border-color: var(--color-secondary); }
.custom-accordion .accordion-collapse { border: 1px solid var(--color-border); border-top: none; border-bottom-left-radius: var(--radius-lg); border-bottom-right-radius: var(--radius-lg); background: #fff; }
.custom-accordion .accordion-body { padding: var(--spacing-lg); }