/* ========================================
   TopFutures.org — 全站樣式系統
   群益期貨 劉安清｜純靜態網站
   ======================================== */

/* --- CSS 變數 --- */
:root {
  --color-primary: #0a1628;
  --color-primary-light: #132144;
  --color-secondary: #1362b5;
  --color-secondary-light: #2d7fd4;
  --color-accent: #ff6b00;
  --color-accent-hover: #e55f00;
  --color-line: #06C755;
  --color-line-hover: #05b34b;
  --color-text: #333;
  --color-text-light: #666;
  --color-text-muted: #999;
  --color-bg: #fff;
  --color-bg-alt: #f8f9fa;
  --color-bg-dark: #0a1628;
  --color-border: #e0e0e0;
  --font-main: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 10px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
  --shadow-hover: 0 12px 40px rgba(0,0,0,.15);
  --transition: .3s ease;
  --header-h: 70px;
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 20px)}
body{font-family:var(--font-main);color:var(--color-text);line-height:1.8;background:var(--color-bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--color-secondary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--color-accent)}
ul,ol{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none}
h1,h2,h3,h4,h5,h6{line-height:1.3;font-weight:700;color:var(--color-primary)}
h1{font-size:clamp(1.75rem,4vw,2.5rem)}
h2{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:.75em}
h3{font-size:clamp(1.2rem,2.5vw,1.5rem);margin-bottom:.5em}
p{margin-bottom:1em}

/* --- 無障礙：略過連結 & Focus Ring --- */
.skip-link{position:absolute;top:-40px;left:16px;padding:8px 16px;background:var(--color-secondary);color:#fff;border-radius:0 0 var(--radius) var(--radius);font-weight:600;z-index:9999;transition:top .2s;text-decoration:none}
.skip-link:focus,.skip-link:focus-visible{top:0;outline:none}
:focus-visible{outline:3px solid var(--color-secondary);outline-offset:3px;border-radius:4px}
:focus:not(:focus-visible){outline:none}

/* --- 動效偏好 --- */
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}html{scroll-behavior:auto}}

/* --- 容器 --- */
.container{width:90%;max-width:var(--max-width);margin:0 auto}
.section{padding:80px 0}
.section-alt{background:var(--color-bg-alt)}
.section-dark{background:var(--color-bg-dark);color:#fff}
.section-dark h2,.section-dark h3{color:#fff}
.section-title{text-align:center;margin-bottom:48px}
.section-title span{color:var(--color-secondary)}
.section-subtitle{font-size:1.1rem;color:var(--color-text-light);max-width:600px;margin:12px auto 0;text-align:center}

/* --- 按鈕 --- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;border-radius:var(--radius);font-weight:600;font-size:1rem;transition:all var(--transition);text-align:center;white-space:nowrap;touch-action:manipulation;min-height:44px}
.btn-primary{background:var(--color-secondary);color:#fff}
.btn-primary:hover{background:var(--color-secondary-light);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-accent{background:var(--color-accent);color:#fff}
.btn-accent:hover{background:var(--color-accent-hover);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-line{background:var(--color-line);color:#fff}
.btn-line:hover{background:var(--color-line-hover);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-outline{border:2px solid var(--color-secondary);color:var(--color-secondary);background:transparent}
.btn-outline:hover{background:var(--color-secondary);color:#fff}
.btn-sm{padding:10px 20px;font-size:.9rem}
.btn-lg{padding:18px 40px;font-size:1.1rem}

/* ========================================
   Header 導航列
   ======================================== */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);background:#fff;z-index:10001;transition:box-shadow var(--transition)}
.site-header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.1)}
.site-header::after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--color-secondary),var(--color-accent))}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{font-size:1.2rem;font-weight:800;color:var(--color-primary);letter-spacing:.5px;display:flex;align-items:center;gap:4px;border-bottom:3px solid transparent;border-image:linear-gradient(90deg,var(--color-secondary),var(--color-accent)) 1;padding-bottom:2px}
.logo span{color:var(--color-secondary);font-weight:500;font-size:1.05rem}

/* 桌面選單 */
.nav-menu{display:flex;align-items:center;gap:8px}
.nav-menu>li{position:relative}
.nav-menu>li>a{display:block;padding:8px 16px;color:var(--color-text);font-weight:500;font-size:.95rem;border-radius:var(--radius);transition:all var(--transition)}
.nav-menu>li>a:hover,.nav-menu>li>a.active{color:var(--color-secondary);background:rgba(19,98,181,.06)}
.nav-cta{background:var(--color-line) !important;color:#fff !important;border-radius:var(--radius) !important}
.nav-cta:hover{background:var(--color-line-hover) !important;transform:translateY(-1px)}

/* 子選單 */
.dropdown{position:absolute;top:100%;left:0;min-width:200px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:8px;opacity:0;visibility:hidden;transform:translateY(10px);transition:all var(--transition)}
.nav-menu>li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:10px 16px;color:var(--color-text);font-size:.9rem;border-radius:6px;transition:all var(--transition)}
.dropdown a:hover{background:var(--color-bg-alt);color:var(--color-secondary)}

/* 漢堡選單 */
.menu-toggle{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--color-primary);transition:all var(--transition)}
.menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

@media(max-width:1024px){
  .menu-toggle{display:flex}
  .nav-menu{
    position:fixed;top:var(--header-h);left:0;right:0;bottom:0;
    background:#fff;
    flex-direction:column;align-items:stretch;
    padding:24px;gap:4px;
    transform:translateX(100%);
    transition:transform var(--transition),visibility var(--transition);
    overflow-y:auto;-webkit-overflow-scrolling:touch;
    z-index:10000;        /* Chrome/Brave 需要明確 z-index */
    visibility:hidden;    /* 關閉時防止遮擋點擊 */
  }
  .nav-menu.open{transform:translateX(0);visibility:visible}
  .nav-menu>li>a{padding:14px 16px;font-size:1.05rem}
  .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;padding:0 0 0 20px;display:none}
  .dropdown.open{display:block}
}

/* ========================================
   Hero 區塊
   ======================================== */
.hero{padding:calc(var(--header-h) + 60px) 0 80px;background:linear-gradient(135deg,var(--color-primary) 0%,#061020 100%);color:#fff;overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero h1{color:#fff;margin-bottom:16px;font-size:clamp(1.8rem,4vw,2.8rem)}
.hero h1 span{color:var(--color-secondary-light)}
.hero-subtitle{font-size:1.15rem;color:rgba(255,255,255,.8);margin-bottom:12px;line-height:1.7}
.hero-phone{font-size:1.05rem;color:rgba(255,255,255,.9);margin-bottom:28px;letter-spacing:.5px}
.hero-phone a{color:#fff;text-decoration:none;border-bottom:1px dashed rgba(255,255,255,.4);transition:border-color .2s}
.hero-phone a:hover{border-bottom-color:#fff}
.hero-ctas{display:flex;gap:16px;flex-wrap:wrap}
.hero-image{text-align:center}
.hero-image img{max-width:380px;border-radius:var(--radius-lg);box-shadow:0 20px 60px rgba(0,0,0,.3)}

@media(max-width:768px){
  .nav-menu{bottom:56px}
  .nav-menu.open{
    bottom:0;
    height:calc(100dvh - var(--header-h)); /* Chrome 動態地址欄修正 */
    height:calc(100vh - var(--header-h));  /* 舊版瀏覽器 fallback */
  }
  .hero{padding:calc(var(--header-h) + 40px) 0 60px}
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero-ctas{justify-content:center}
  .hero-image{order:-1}
  .hero-image img{max-width:260px;margin:0 auto}
}

/* ========================================
   信任指標列
   ======================================== */
.trust-bar{background:var(--color-bg-alt);padding:40px 0;border-bottom:1px solid var(--color-border)}
.trust-items{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.trust-item .trust-icon{width:48px;height:48px;margin:0 auto 12px;color:var(--color-secondary)}
.trust-item .trust-number{font-size:1.5rem;font-weight:700;color:var(--color-primary)}
.trust-item .trust-label{font-size:.85rem;color:var(--color-text-light);margin-top:4px}

@media(max-width:768px){
  .trust-items{grid-template-columns:repeat(2,1fr);gap:24px}
}

/* ========================================
   服務卡片
   ======================================== */
.service-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.service-card{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:32px 24px;text-align:center;transition:all var(--transition)}
.service-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover);border-color:var(--color-secondary)}
.service-card .card-icon{width:56px;height:56px;margin:0 auto 20px;color:var(--color-secondary)}
.service-card h3{font-size:1.15rem;margin-bottom:12px}
.service-card p{font-size:.9rem;color:var(--color-text-light);margin-bottom:20px}
.service-card .card-link{color:var(--color-secondary);font-weight:600;font-size:.9rem}
.service-card:hover .card-link{color:var(--color-accent)}

@media(max-width:1024px){.service-cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.service-cards{grid-template-columns:1fr}}

/* ========================================
   為什麼選擇我
   ======================================== */
.why-items{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.why-item{display:flex;flex-direction:column;background:#fff;border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 2px 12px rgba(10,22,40,.07);transition:box-shadow .2s}
.why-item:hover{box-shadow:0 6px 24px rgba(10,22,40,.12)}
.why-item .why-img{aspect-ratio:16/9;overflow:hidden;width:100%;flex-shrink:0}
.why-item .why-img img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s}
.why-item:hover .why-img img{transform:scale(1.04)}
.why-item .why-img svg{width:50%;color:var(--color-secondary);margin:auto}
.why-item .why-text{padding:1.25rem 1.5rem 1.5rem}
.why-item h3{margin-bottom:8px;font-size:1.1rem}
.why-item p{color:var(--color-text-light);font-size:.93rem;line-height:1.65;margin:0}

@media(max-width:900px){
  .why-items{grid-template-columns:1fr}
  .why-item{flex-direction:row;align-items:stretch}
  .why-item .why-img{width:180px;flex-shrink:0;aspect-ratio:auto}
  .why-item .why-text{flex:1}
}
@media(max-width:560px){
  .why-item{flex-direction:column}
  .why-item .why-img{width:100%;aspect-ratio:16/9}
}

/* ========================================
   TradingView
   ======================================== */
.tradingview-section{padding:60px 0}
.tradingview-widget{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--color-border);box-shadow:var(--shadow)}

/* ========================================
   文章卡片（精選區 + 列表頁共用）
   ======================================== */
.articles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition)}
.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.article-card a{color:inherit}
.article-card .card-thumb{aspect-ratio:16/9;background:var(--color-bg-alt);overflow:hidden}
.article-card .card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition)}
.article-card:hover .card-thumb img{transform:scale(1.05)}
.article-card .card-body{padding:20px}
.article-card .card-category{display:inline-block;padding:4px 12px;background:rgba(26,115,232,.1);color:var(--color-secondary);font-size:.8rem;font-weight:600;border-radius:20px;margin-bottom:12px}
.article-card .card-title{font-size:1.05rem;font-weight:600;color:var(--color-primary);margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.article-card .card-excerpt{font-size:.88rem;color:var(--color-text-light);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:12px}
.article-card .card-date{font-size:.8rem;color:var(--color-text-muted)}
.more-link{text-align:center;margin-top:40px}

@media(max-width:1024px){.articles-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.articles-grid{grid-template-columns:1fr}}

/* ========================================
   客戶見證
   ======================================== */
.testimonials-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.testimonial-card{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:32px 28px;position:relative;transition:box-shadow var(--transition)}
.testimonial-card:hover{box-shadow:var(--shadow-lg)}
.testimonial-quote{font-size:3.5rem;color:var(--color-secondary);opacity:.18;line-height:1;font-family:Georgia,serif;margin-bottom:-8px;display:block}
.testimonial-stars{color:#f59e0b;font-size:.95rem;letter-spacing:2px;margin-bottom:12px}
.testimonial-text{font-size:.95rem;color:var(--color-text);line-height:1.85;margin-bottom:20px}
.testimonial-author{display:flex;align-items:center;gap:12px;padding-top:16px;border-top:1px solid var(--color-border)}
.testimonial-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--color-secondary),var(--color-accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.95rem;flex-shrink:0}
.testimonial-name{font-weight:700;color:var(--color-primary);font-size:.9rem}
.testimonial-role{font-size:.8rem;color:var(--color-text-muted);margin-top:2px}
@media(max-width:1024px){.testimonials-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.testimonials-grid{grid-template-columns:1fr}}

/* ========================================
   FAQ 手風琴
   ======================================== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--color-border)}
.faq-question{width:100%;text-align:left;padding:20px 0;font-size:1.05rem;font-weight:600;color:var(--color-primary);display:flex;justify-content:space-between;align-items:center;gap:16px;cursor:pointer}
.faq-question::after{content:'+';font-size:1.5rem;font-weight:400;color:var(--color-text-muted);transition:transform var(--transition);flex-shrink:0}
.faq-item.active .faq-question::after{transform:rotate(45deg);color:var(--color-secondary)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq-answer-inner{padding:0 0 20px;color:var(--color-text-light);line-height:1.8}

/* ========================================
   底部 CTA 區
   ======================================== */
.bottom-cta{padding:80px 0;text-align:center}
.bottom-cta h2{color:#fff;margin-bottom:12px}
.bottom-cta p{color:rgba(255,255,255,.7);margin-bottom:32px;font-size:1.1rem}
.bottom-cta .cta-contacts{display:flex;justify-content:center;gap:40px;flex-wrap:wrap;margin-top:40px}
.bottom-cta .cta-contact-item{display:flex;flex-direction:column;align-items:center;gap:8px;color:rgba(255,255,255,.8);font-size:.9rem}
.bottom-cta .cta-contact-item svg{width:32px;height:32px;color:var(--color-secondary-light)}
.qr-code{width:140px;height:140px;background:#fff;border-radius:var(--radius);padding:8px;margin:0 auto 20px}
.qr-code img{width:100%;height:100%;object-fit:contain}

/* ========================================
   Footer
   ======================================== */
.site-footer{background:#050e1d;color:rgba(255,255,255,.6);padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:16px}
.footer-col p{font-size:.88rem;line-height:1.8}
.footer-col a{color:rgba(255,255,255,.6);font-size:.88rem;transition:color var(--transition)}
.footer-col a:hover{color:var(--color-secondary-light)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:24px;text-align:center;font-size:.8rem}
.footer-disclaimer{max-width:800px;margin:20px auto 0;font-size:.75rem;color:rgba(255,255,255,.4);line-height:1.8}

@media(max-width:768px){
  .footer-grid{grid-template-columns:1fr;gap:32px}
}

/* ========================================
   懸浮 LINE 按鈕
   ======================================== */
.sticky-line{position:fixed;z-index:9999}

/* 桌面版：右下角圓形 */
@media(min-width:769px){
  .sticky-line{bottom:24px;right:24px}
  .sticky-line a{display:flex;align-items:center;justify-content:center;width:60px;height:60px;background:var(--color-line);border-radius:50%;color:#fff;box-shadow:0 4px 20px rgba(6,199,85,.4);transition:all var(--transition);animation:pulse 2s infinite}
  .sticky-line a:hover{transform:scale(1.1);box-shadow:0 6px 25px rgba(6,199,85,.5)}
  .sticky-line svg{width:32px;height:32px}
  .sticky-line .sticky-text{display:none}
}

/* 手機版：底部全寬橫條 */
@media(max-width:768px){
  .sticky-line{bottom:0;left:0;right:0}
  .sticky-line a{display:flex;align-items:center;justify-content:center;gap:8px;height:56px;background:var(--color-line);color:#fff;font-weight:600;font-size:1rem;box-shadow:0 -2px 10px rgba(0,0,0,.15)}
  .sticky-line svg{width:24px;height:24px}
  body{padding-bottom:56px}
}

@keyframes pulse{
  0%{box-shadow:0 4px 20px rgba(6,199,85,.4)}
  50%{box-shadow:0 4px 20px rgba(6,199,85,.4),0 0 0 12px rgba(6,199,85,.1)}
  100%{box-shadow:0 4px 20px rgba(6,199,85,.4)}
}

/* ========================================
   文章內頁排版
   ======================================== */
.article-header{padding:calc(var(--header-h) + 40px) 0 40px;background:var(--color-bg-alt)}
.article-meta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.article-meta .category-tag{padding:4px 12px;background:var(--color-secondary);color:#fff;font-size:.8rem;font-weight:600;border-radius:20px}
.article-meta .date,.article-meta .read-time{font-size:.88rem;color:var(--color-text-muted)}
.breadcrumb{font-size:.85rem;color:var(--color-text-muted);margin-bottom:16px}
.breadcrumb a{color:var(--color-text-muted)}
.breadcrumb a:hover{color:var(--color-secondary)}
.breadcrumb span{margin:0 8px}

/* 文章主體 */
.article-layout{display:grid;grid-template-columns:260px 1fr;gap:40px;padding:60px 0}
.article-toc{position:sticky;top:calc(var(--header-h) + 20px);align-self:start;max-height:calc(100vh - var(--header-h) - 40px);overflow-y:auto}
.toc-title{font-size:.9rem;font-weight:700;color:var(--color-primary);margin-bottom:16px;text-transform:uppercase;letter-spacing:.5px}
.toc-list{display:flex;flex-direction:column;gap:4px}
.toc-list a{font-size:.85rem;color:var(--color-text-light);padding:6px 12px;border-left:2px solid transparent;transition:all var(--transition);display:block}
.toc-list a:hover,.toc-list a.active{color:var(--color-secondary);border-left-color:var(--color-secondary);background:rgba(26,115,232,.04)}
.toc-list a.toc-h3{padding-left:24px;font-size:.82rem}

.article-content h2{margin-top:48px;padding-top:24px;border-top:1px solid var(--color-border)}
.article-content h2:first-child{margin-top:0;padding-top:0;border-top:none}
.article-content h3{margin-top:32px}
.article-content p{margin-bottom:1.2em;line-height:1.9}
.article-content ul,.article-content ol{padding-left:1.5em;margin-bottom:1.2em}
.article-content ul{list-style:disc}
.article-content ol{list-style:decimal}
.article-content li{margin-bottom:.5em;line-height:1.8}
.article-content img{border-radius:var(--radius);margin:24px 0;box-shadow:var(--shadow);max-width:100%;height:auto}
.article-content figure{margin:32px 0;text-align:center}
.article-content figure img{margin:0 0 12px}
.article-content figcaption{font-size:.875rem;color:#666;line-height:1.6;text-align:center}
.article-content table{width:100%;border-collapse:collapse;margin:24px 0;font-size:.9rem}
.article-content th,.article-content td{padding:12px 16px;border:1px solid var(--color-border);text-align:left}
.article-content th{background:var(--color-bg-alt);font-weight:600}
.article-content blockquote{border-left:4px solid var(--color-secondary);padding:16px 24px;margin:24px 0;background:var(--color-bg-alt);border-radius:0 var(--radius) var(--radius) 0}
.article-content code{background:var(--color-bg-alt);padding:2px 8px;border-radius:4px;font-size:.9em;font-family:'Fira Code',monospace}
.article-content pre{background:var(--color-primary);color:#e0e0e0;padding:24px;border-radius:var(--radius);overflow-x:auto;margin:24px 0}
.article-content pre code{background:none;padding:0;color:inherit}
.article-content .table-responsive{overflow-x:auto;margin:24px 0}

@media(max-width:1024px){
  .article-layout{grid-template-columns:1fr}
  .article-toc{position:static;border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;margin-bottom:24px;max-height:none}
}

/* ========================================
   文章底部 CTA
   ======================================== */
.author-cta{margin-top:60px;padding-top:40px;border-top:2px solid var(--color-border)}
.author-box{display:flex;gap:24px;align-items:center;padding:32px;background:var(--color-bg-alt);border-radius:var(--radius-lg);margin-bottom:24px}
.author-avatar{width:80px;height:80px;border-radius:50%;overflow:hidden;flex-shrink:0;background:var(--color-border)}
.author-avatar img{width:100%;height:100%;object-fit:cover}
.author-info h4{font-size:1.1rem;margin-bottom:4px}
.author-info p{font-size:.9rem;color:var(--color-text-light);margin-bottom:8px}
.cta-message{text-align:center;padding:32px;background:linear-gradient(135deg,var(--color-primary-light),var(--color-primary));border-radius:var(--radius-lg);color:#fff}
.cta-message p{font-size:1.1rem;margin-bottom:20px;color:rgba(255,255,255,.9)}
.cta-message .btn-line{font-size:1.1rem;padding:16px 40px}

/* ========================================
   相關文章
   ======================================== */
.related-articles{margin-top:60px;padding-top:40px;border-top:1px solid var(--color-border)}

/* ========================================
   文章列表篩選
   ======================================== */
.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:40px;justify-content:center}
.filter-btn{padding:8px 20px;border:2px solid var(--color-border);border-radius:20px;font-size:.9rem;font-weight:500;color:var(--color-text-light);transition:all var(--transition);cursor:pointer;background:#fff}
.filter-btn:hover,.filter-btn.active{border-color:var(--color-secondary);color:var(--color-secondary);background:rgba(26,115,232,.05)}

/* ========================================
   404 頁面
   ======================================== */
.page-404{padding:calc(var(--header-h) + 80px) 0 80px;text-align:center;min-height:60vh;display:flex;align-items:center}
.page-404 h1{font-size:clamp(4rem,10vw,8rem);color:var(--color-border);margin-bottom:16px}
.page-404 h2{margin-bottom:16px}
.page-404 p{color:var(--color-text-light);margin-bottom:32px}
.page-404 .links{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ========================================
   回到頂部
   ======================================== */
.back-to-top{position:fixed;bottom:100px;right:24px;width:44px;height:44px;background:var(--color-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:all var(--transition);z-index:999;box-shadow:var(--shadow)}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--color-secondary);transform:translateY(-2px);color:#fff}
.back-to-top svg{width:20px;height:20px}

@media(max-width:768px){
  .back-to-top{bottom:72px;right:16px}
  .section{padding:60px 0}
}

/* ========================================
   通用工具類
   ======================================== */
.text-center{text-align:center}
.text-primary{color:var(--color-secondary)}
.text-accent{color:var(--color-accent)}
.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mt-4{margin-top:32px}
.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.mb-4{margin-bottom:32px}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ========================================
   閱讀進度條
   ======================================== */
#reading-progress{position:fixed;top:0;left:0;z-index:1001;width:0;height:3px;background:linear-gradient(90deg,var(--color-secondary),var(--color-accent));transition:width .1s linear;pointer-events:none}

/* ========================================
   文章 Meta 分類標籤
   ======================================== */
.article-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px}
.article-meta .card-category{display:inline-block;padding:4px 14px;background:rgba(26,115,232,.12);color:var(--color-secondary);font-size:.8rem;font-weight:700;border-radius:20px;letter-spacing:.3px}
.article-meta time,.article-meta span{font-size:.88rem;color:var(--color-text-muted)}

/* ========================================
   文章 H1 / 首段落強調
   ======================================== */
.article-content h1{font-size:clamp(1.75rem,3.5vw,2.4rem);font-weight:800;line-height:1.3;margin-bottom:28px;color:var(--color-primary)}
.article-content>p:first-of-type{font-size:1.05rem;color:var(--color-text);line-height:2}

/* ========================================
   緊湊型相關文章格子
   ======================================== */
.articles-grid--compact{gap:16px}
.articles-grid--compact .article-card .card-body{padding:16px}
.articles-grid--compact .article-card .card-title{font-size:.95rem}

/* ========================================
   文章 TOC Sidebar 改善
   ======================================== */
.toc-sticky{position:sticky;top:calc(var(--header-h) + 24px);padding:20px;background:var(--color-bg-alt);border-radius:var(--radius-lg);border:1px solid var(--color-border);max-height:calc(100vh - var(--header-h) - 48px);overflow-y:auto}
@media(max-width:1024px){.toc-sticky{position:static;margin-bottom:24px;max-height:none}}

/* ========================================
   Steps List（操作步驟）
   ======================================== */
.steps-list{display:flex;flex-direction:column;gap:12px;margin:20px 0}
.step-item{display:flex;align-items:baseline;gap:12px}
.step-num{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--color-secondary);color:#fff;font-size:.85rem;font-weight:700;line-height:1}
.step-item>div:last-child{flex:1}
.step-item>div:last-child p{margin-bottom:0}

/* ========================================
   作者 Box 行動版優化
   ======================================== */
@media(max-width:600px){
  .author-box{flex-direction:column;text-align:center}
  .cta-message .btn-line{width:100%;justify-content:center}
}