/* ==========================================================================
   🎨 商聯科技風格樣式表 (SaaS Tech Palette) - 完整完美 RWD 整合版
   ========================================================================== */
:root {
    --primary: #0F172A;      /* 深邃藍黑（主要商務調性） */
    --accent: #2563EB;       /* 科技藍（行動呼籲、亮點） */
    --accent-hover: #1D4ED8;
    --text-dark: #1E293B;    /* 深灰字體（高易讀性） */
    --text-light: #64748B;   /* 輔支灰 */
    --bg-light: #F8FAFC;     /* 背景灰白 */
    --bg-card: #FFFFFF;
    --line-green: #06C755;   /* LINE 官方品牌色 */
    --tg-blue: #229ED9;      /* Telegram 官方品牌色 */
    --border-color: #E2E8F0;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-stack);
    color: var(--text-dark);
    background-color: var(--bg-light);
    line-height: 1.6;
    overflow-x: hidden; /* 預防網頁出現不正常的橫向滾動條 */
}

img, video, canvas, svg {
    max-width: 100%;
    height: auto;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   導覽列 (Navbar)
   ========================================================================== */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.nav-container {
    height: 72px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-item {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-item:hover {
    color: var(--accent);
}

/* 語系切換下拉選單 */
.lang-selector {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: #fff;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
}

/* ==========================================================================
   按鈕群基本樣式 (Buttons)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: #EDF2F7;
}

.btn-line { background-color: var(--line-green); color: #fff; }
.btn-line:hover { background-color: #05B34B; }
.btn-tg { background-color: var(--tg-blue); color: #fff; }
.btn-tg:hover { background-color: #1D8CBF; }

/* ==========================================================================
   Hero 主視覺區
   ========================================================================== */
.hero {
    padding: 80px 0;
    background: radial-gradient(100% 100% at 50% 0%, rgba(37, 99, 235, 0.05) 0%, rgba(255, 255, 255, 0) 100%);
    border-bottom: 1px solid var(--border-color);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}

.badge {
    display: inline-block;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.hero-text h1 {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-text p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

/* 雙平台對話框模擬 (Mockup Container) */
.platform-preview-container {
    position: relative;
    height: 380px;
    width: 100%;
}

.mockup-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    padding: 20px;
    width: 320px;
    position: absolute;
}

.line-mockup {
    top: 10px;
    left: 10px;
    z-index: 2;
    border-left: 4px solid var(--line-green);
}

.tg-mockup {
    bottom: 10px;
    right: 10px;
    z-index: 1;
    border-left: 4px solid var(--tg-blue);
}

.mockup-tag {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 12px;
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
}
.line-tag { background: rgba(6, 199, 85, 0.1); color: var(--line-green); }
.tg-tag { background: rgba(34, 158, 217, 0.1); color: var(--tg-blue); }

.mockup-header .name {
    font-weight: 600;
    font-size: 0.85rem;
    display: block;
    color: var(--primary);
}

.mockup-header .source-text {
    font-size: 0.9rem;
    color: var(--text-light);
    display: block;
    margin-bottom: 8px;
}

.mockup-body {
    background: var(--bg-light);
    padding: 10px 12px;
    border-radius: 6px;
    margin-bottom: 12px;
}

.translated-text {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary);
}

.mockup-footer .mock-btn {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 600;
}

/* ==========================================================================
   特色功能區 & 平台細節區 (桌機版預設顯示)
   ========================================================================== */
.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 48px;
    letter-spacing: -0.5px;
}

.features {
    padding: 80px 0;
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-light);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary);
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.platforms-section {
    padding: 80px 0;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.platform-detail-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
}

.platform-detail-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.platform-detail-card ul {
    list-style: none;
}

.platform-detail-card ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-dark);
}

.platform-detail-card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

.line-border { border-top: 4px solid var(--line-green); }
.tg-border { border-top: 4px solid var(--tg-blue); }

/* ==========================================================================
   CTA 行動呼籲 (Call To Action)
   ========================================================================== */
.cta {
    padding: 80px 0;
    background-color: var(--primary);
    color: #fff;
    text-align: center;
}

.cta-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.cta-header p {
    color: #94A3B8;
    max-width: 600px;
    margin: 0 auto 48px auto;
}

.cta-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.cta-platform-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.badge-tag {
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 24px;
}
.line-bg { background-color: rgba(6, 199, 85, 0.2); color: #22C55E; }
.tg-bg { background-color: rgba(34, 158, 217, 0.2); color: #38BDF8; }

.cta-platform-box .btn {
    width: 100%;
    margin-bottom: 16px;
}

.notice {
    font-size: 0.8rem;
    color: #94A3B8;
    text-align: left;
}

/* ==========================================================================
   💰 贊助區塊 (Sponsor Section)
   ========================================================================== */
.sponsor-section {
    padding: 80px 0;
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

.sponsor-desc {
    text-align: center;
    color: var(--text-light);
    max-width: 760px;
    margin: -24px auto 48px auto;
    font-size: 1rem;
}

.sponsor-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 850px;
    margin: 0 auto;
}

.sponsor-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px 32px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.sponsor-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 20px -5px rgba(15, 23, 42, 0.08);
}

.featured-sponsor {
    border: 2px solid var(--accent);
    position: relative;
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.05);
}

.sponsor-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.sponsor-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.sponsor-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 32px;
    flex-grow: 1;
}

.sponsor-card .btn {
    width: 100%;
    max-width: 240px;
}

/* 頁尾 */
.footer {
    padding: 32px 0;
    background: #0B0F19;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: #64748B;
    font-size: 0.9rem;
    text-align: center;
}


/* ==========================================================================
   📱 完美一體化 RWD 響應式斷點設計
   ========================================================================== */

/* 【階段一】中大型平板 / 筆電 (小於 1024px) */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr; /* Hero 轉單欄 */
        gap: 40px;
    }

    /* 將絕對定位改為相對流式佈局，讓兩張卡片並排，防破版 */
    .platform-preview-container {
        height: auto;
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }

    .mockup-card {
        position: relative;
        top: auto; left: auto; right: auto; bottom: auto;
        width: calc(50% - 10px);
        min-width: 280px;
        max-width: 340px;
    }
}

/* 【階段二】標準平板與手機版 (小於 968px) ─── 💡 在此處完全移除核心特性與平台串接 ─── */
@media (max-width: 968px) {
    /* ─── 核心修改：在手機和平板直接隱藏這兩個區塊 ─── */
    .features, 
    .platforms-section {
        display: none !important;
    }

    /* 其餘區塊一律轉為單欄 */
    .cta-grid, 
    .sponsor-grid {
        grid-template-columns: 1fr;
    }

    .hero-text {
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .sponsor-card {
        padding: 32px 24px;
    }
}

/* 【階段三】小型手機端 (小於 576px) */
@media (max-width: 576px) {
    .container {
        padding: 0 16px; /* 手機邊距緊湊 */
    }

    /* 導覽列防爆改直排 */
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 12px 0;
        gap: 8px;
    }

    .nav-right {
        width: 100%;
        justify-content: center;
        gap: 16px;
    }

    .nav-links {
        gap: 16px;
    }

    /* 主視覺文字縮小適應手機螢幕 */
    .hero {
        padding: 40px 0;
    }

    .hero-text h1 {
        font-size: 2rem;
        line-height: 1.3;
    }

    .hero-text p {
        font-size: 1rem;
        margin-bottom: 24px;
    }

    /* 按鈕上下滿版，點擊更容易 */
    .hero-actions {
        flex-direction: column;
        width: 100%;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 320px;
    }

    /* 對話框卡片寬度自適應撐滿 */
    .mockup-card {
        width: 100%;
        max-width: 100%;
    }

    /* 大標題手機版縮小 */
    .section-title {
        font-size: 1.6rem;
        margin-bottom: 32px;
    }

    .cta-header h2 {
        font-size: 1.75rem;
    }

    .cta-platform-box {
        padding: 24px 16px;
    }
    
    .sponsor-card {
        padding: 24px 16px;
    }
}