/* 外贸实操录播课 - 自定义样式 */
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif; }

/* 渐变文字 */
.gradient-text {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 渐变背景 */
.hero-gradient {
    background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 40%, #2563eb 70%, #3b82f6 100%);
}

.card-hover {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}

/* 免费标签 */
.badge-free {
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}
.badge-paid {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}

/* 购买按钮 */
.btn-buy {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
    padding: 14px 40px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.125rem;
    transition: all 0.2s ease;
    box-shadow: 0 4px 16px rgba(245,158,11,0.4);
    border: none;
    cursor: pointer;
    display: inline-block;
    text-align: center;
    text-decoration: none;
}
.btn-buy:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245,158,11,0.5);
}

/* 章节卡片 */
.chapter-card {
    border-left: 4px solid transparent;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}
.chapter-card.free { border-left-color: #10b981; }
.chapter-card.paid { border-left-color: #f59e0b; }
.chapter-card:hover { background-color: #f8fafc; }

/* 视频占位区 */
.video-placeholder {
    background: linear-gradient(135deg, #1e293b, #334155);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 240px;
    color: #94a3b8;
    font-size: 1.1rem;
    position: relative;
    overflow: hidden;
}
.video-placeholder::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 1;
}
.video-placeholder .play-icon {
    position: relative;
    z-index: 2;
    width: 64px;
    height: 64px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    transition: transform 0.2s ease;
}
.video-placeholder:hover .play-icon {
    transform: scale(1.1);
}

/* 通知横幅 */
.notice-banner {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 1px solid #fbbf24;
    color: #92400e;
    padding: 12px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 复选框美化 */
input[type="checkbox"].custom-checkbox {
    accent-color: #2563eb;
    width: 18px;
    height: 18px;
    cursor: pointer;
}