/* ============================================================
   tutorial.css — Calibre 教程页面专用样式
   依赖 :root CSS 变量（定义于 tutorial.html 内联 <style>）
   ============================================================ */

/* ---- 导航 ---- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    padding: 18px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(180deg, rgba(12, 12, 16, 0.95) 0%, transparent 100%);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 28px;
    cursor: pointer;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.nav-links {
    display: flex;
    gap: 36px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
}

.btn-dl {
    background: linear-gradient(135deg, var(--accent-primary), #00e6b8);
    color: #0c0c10;
    padding: 10px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s;
}

.btn-dl:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 212, 170, 0.35);
}

/* ---- Hero ---- */
.hero {
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 140px 20px 80px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 212, 170, 0.1);
    border: 1px solid rgba(0, 212, 170, 0.2);
    padding: 8px 18px;
    border-radius: 20px;
    color: var(--accent-primary);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 28px;
}

.hero h1 {
    font-size: clamp(36px, 5vw, 54px);
    font-weight: 900;
    margin-bottom: 18px;
    line-height: 1.2;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-cool));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 520px;
    margin-bottom: 40px;
}

.hero-steps {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-step {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-card);
    padding: 12px 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.hero-step-num {
    width: 28px;
    height: 28px;
    background: var(--accent-primary);
    color: var(--bg-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

.hero-step span {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ---- 主内容区 ---- */
.main {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px 100px;
}

/* ---- 分区标题 ---- */
.section-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
    padding-left: 16px;
    border-left: 3px solid var(--accent-primary);
    color: var(--text-primary);
}

/* ---- 教程卡片 ---- */
.tutorial-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 40px;
    margin-bottom: 40px;
    border: 1px solid rgba(255, 255, 255, 0.04);
    position: relative;
    overflow: hidden;
}

.tutorial-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
}

/* 卡片颜色边条 — 基于类名精确选择 */
.card-primary::before  { background: var(--accent-primary); }
.card-warm::before     { background: var(--accent-warm); }
.card-cool::before     { background: var(--accent-cool); }
.card-soft::before     { background: var(--accent-soft); }
.card-gold::before     { background: #f7d44c; }

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

/* 卡片图标背景色 */
.card-primary .card-icon {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.2), rgba(0, 212, 170, 0.05));
}
.card-warm .card-icon {
    background: linear-gradient(135deg, rgba(253, 150, 68, 0.2), rgba(253, 150, 68, 0.05));
}
.card-cool .card-icon {
    background: linear-gradient(135deg, rgba(69, 170, 242, 0.2), rgba(69, 170, 242, 0.05));
}
.card-soft .card-icon {
    background: linear-gradient(135deg, rgba(165, 94, 234, 0.2), rgba(165, 94, 234, 0.05));
}
.card-gold .card-icon {
    background: linear-gradient(135deg, rgba(247, 212, 76, 0.2), rgba(247, 212, 76, 0.05));
}

.card-header h2 {
    font-size: 24px;
    font-weight: 700;
}

.card-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ---- 操作步骤 ---- */
.action-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.action-item {
    display: flex;
    align-items: stretch;
    background: var(--bg-hover);
    border-radius: 14px;
    overflow: hidden;
    transition: all 0.3s;
}

.action-item:hover {
    transform: translateX(6px);
    background: #222233;
}

.action-num {
    width: 44px;
    background: rgba(0, 212, 170, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--accent-primary);
    font-size: 16px;
    flex-shrink: 0;
}

/* 各卡片操作编号颜色 */
.card-warm .action-num { background: rgba(253, 150, 68, 0.15); color: var(--accent-warm); }
.card-cool .action-num { background: rgba(69, 170, 242, 0.15); color: var(--accent-cool); }
.card-soft .action-num { background: rgba(165, 94, 234, 0.15); color: var(--accent-soft); }
.card-gold .action-num { background: rgba(247, 212, 76, 0.15); color: #c9a820; }

.action-content {
    padding: 16px 20px;
    flex: 1;
}

.action-content strong {
    display: block;
    font-size: 15px;
    margin-bottom: 6px;
}

.action-content p {
    color: var(--text-secondary);
    font-size: 13px;
    margin: 0;
}

/* ---- 代码块 ---- */
.code-block {
    background: #0d0d14;
    padding: 14px 18px;
    border-radius: 10px;
    font-family: 'Consolas', monospace;
    font-size: 13px;
    color: var(--accent-primary);
    margin-top: 10px;
    border: 1px solid rgba(0, 212, 170, 0.15);
    word-break: break-all;
    overflow-x: auto;
}

/* ---- 小提示 ---- */
.tip {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(253, 150, 68, 0.1);
    border: 1px solid rgba(253, 150, 68, 0.2);
    padding: 10px 16px;
    border-radius: 10px;
    margin-top: 20px;
    font-size: 13px;
    color: var(--accent-warm);
}

/* ---- 进阶教程链接 ---- */
.advanced-link {
    display: inline-block;
    margin-top: 12px;
    background: linear-gradient(135deg, #f7d44c, #e6a800);
    color: #0c0c10;
    padding: 9px 22px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    transition: all 0.3s;
}

.advanced-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(247, 212, 76, 0.4);
}

/* ---- 底部CTA ---- */
.cta {
    text-align: center;
    padding: 80px 20px 100px;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 212, 170, 0.02) 100%);
}

.cta h2 {
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 14px;
}

.cta p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #00e6b8);
    color: #0c0c10;
    padding: 16px 40px;
    border-radius: 14px;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 212, 170, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.12);
    padding: 16px 40px;
    border-radius: 14px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
}

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

/* ---- 页脚 ---- */
.footer {
    padding: 50px 20px 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    text-align: center;
}

.footer p {
    color: var(--text-muted);
    font-size: 13px;
}

/* ============================================================
   响应式 — 768px 断点
   ============================================================ */
@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }
    .navbar {
        padding: 16px 20px;
    }
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
        font-size: 28px;
        padding: 8px;
    }
    .hero-steps {
        gap: 12px;
    }
    .hero-step {
        padding: 10px 14px;
    }
    .tutorial-card {
        padding: 28px 20px;
    }
    .action-item {
        flex-direction: column;
    }
    .action-num {
        width: 100%;
        padding: 8px;
    }
    .code-block {
        overflow-x: hidden;
        word-wrap: break-word;
        white-space: pre-wrap;
    }
    .main {
        overflow-x: hidden;
        padding: 0 16px 80px;
    }
    table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}