/* ===================================
   课程页面样式 v5.0
   Courses Page Styles
   =================================== */

/* 页面标题区 */
.page-header {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-800));
    color: white;
    padding: var(--space-24) 0 var(--space-16);
    margin-top: -120px;
    padding-top: calc(120px + var(--space-16));
}

.page-header-content {
    text-align: center;
}

.page-header h1 {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-4);
    color: white;
}

.page-header p {
    font-size: var(--text-lg);
    opacity: 0.9;
    margin-bottom: var(--space-6);
}

.breadcrumb {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
}

.breadcrumb a:hover {
    color: white;
}

.breadcrumb span {
    color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .page-header h1 {
        font-size: var(--text-2xl);
    }
}

/* 课程区域 */
.courses-section {
    background: white;
    padding: var(--space-16) 0;
}

/* 课程标签 */
.course-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-10);
    flex-wrap: wrap;
}

.course-tab {
    padding: var(--space-3) var(--space-6);
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.course-tab:hover {
    background: var(--color-primary-100);
    color: var(--color-primary-600);
}

.course-tab.active {
    background: var(--color-primary-500);
    color: white;
}

@media (max-width: 640px) {
    .course-tabs {
        gap: var(--space-2);
    }
    
    .course-tab {
        padding: var(--space-2) var(--space-4);
        font-size: var(--text-sm);
    }
}

/* 课程网格 */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.course-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.course-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.course-image .image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-4xl);
}

.course-badge {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
}

.course-category {
    position: absolute;
    bottom: var(--space-4);
    left: var(--space-4);
}

.course-content {
    padding: var(--space-6);
}

.course-title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.course-subtitle {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-4);
    line-height: var(--leading-relaxed);
}

.course-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.course-meta i {
    color: var(--color-primary-500);
    width: 16px;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-light);
}

.course-price {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--color-accent-600);
}

.course-consult-note {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: #2563eb;
    font-size: var(--text-sm);
    font-weight: 700;
}

.course-card .course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.35s ease;
}

.course-card:hover .course-image img {
    transform: scale(1.045);
}

.course-geo-section .geo-answer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.course-geo-section .geo-answer-card {
    display: block;
    min-height: 148px;
    padding: 24px 26px;
    background: #fff;
    border: 1px solid #d6e6ff;
    border-radius: 18px;
    color: var(--text-primary);
    text-decoration: none;
    box-shadow: 0 18px 42px rgba(24, 87, 160, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.course-geo-section .geo-answer-card:hover {
    transform: translateY(-4px);
    border-color: #76b7ff;
    box-shadow: 0 24px 54px rgba(24, 87, 160, 0.13);
}

.course-geo-section .geo-answer-card h3 {
    margin: 0 0 12px;
    font-size: 20px;
    line-height: 1.35;
    color: #071b3d;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-geo-section .geo-answer-card p {
    margin: 0 0 14px;
    font-size: 15px;
    line-height: 1.8;
    color: #4b6485;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-geo-section .geo-answer-card > span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 700;
    color: var(--primary, #0b6bdc);
}

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

@media (max-width: 640px) {
    .course-grid {
        grid-template-columns: 1fr;
    }

    .course-geo-section .geo-answer-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .course-geo-section .geo-answer-card {
        min-height: auto;
        padding: 18px;
        border-radius: 14px;
    }

    .course-geo-section .geo-answer-card h3 {
        font-size: 18px;
    }
}

/* 空状态 */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-16);
    color: var(--text-muted);
}

.empty-state i {
    font-size: var(--text-6xl);
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state p {
    font-size: var(--text-lg);
}

/* CTA小区域 */
.cta-section-sm {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-800));
    color: white;
    text-align: center;
    padding: var(--space-16) 0;
}

.cta-section-sm h2 {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-4);
}

.cta-section-sm p {
    font-size: var(--text-lg);
    opacity: 0.9;
    margin-bottom: var(--space-6);
}

@media (max-width: 768px) {
    .cta-section-sm h2 {
        font-size: var(--text-2xl);
    }
}

/* 课程详情页 v6.4 */
.course-detail-hero {
    margin-top: -120px;
    padding: calc(120px + 72px) 0 72px;
    background:
        linear-gradient(90deg, rgba(15, 23, 42, 0.88) 0%, rgba(29, 78, 216, 0.82) 52%, rgba(37, 99, 235, 0.72) 100%);
    color: #fff;
    overflow: hidden;
}

.course-detail-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 470px;
    align-items: center;
    gap: clamp(36px, 6vw, 88px);
}

.course-detail-breadcrumb {
    justify-content: flex-start;
    margin-bottom: 22px;
}

.course-detail-kicker {
    display: inline-flex;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.22);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 18px;
}

.course-detail-hero h1 {
    font-size: clamp(36px, 4vw, 56px);
    color: #fff;
    line-height: 1.12;
    margin-bottom: 18px;
    text-shadow: 0 10px 30px rgba(15, 23, 42, 0.28);
}

.course-detail-hero p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    max-width: 720px;
    margin-bottom: 28px;
}

.course-detail-actions,
.course-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

.course-detail-tags {
    margin-top: 24px;
}

.course-detail-tags span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.13);
    border: 1px solid rgba(255, 255, 255, 0.16);
    font-size: 13px;
    color: rgba(255, 255, 255, 0.92);
}

.course-detail-hero-media {
    position: relative;
    border-radius: 22px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    border: 1px solid rgba(255, 255, 255, 0.24);
    box-shadow: 0 32px 86px rgba(15, 23, 42, 0.28);
}

.course-detail-hero-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.course-detail-body {
    background: #f7fbff;
    padding: 64px 0 78px;
}

.course-detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 380px;
    gap: 30px;
    align-items: start;
}

.course-detail-main {
    display: grid;
    gap: 22px;
}

.course-panel,
.course-consult-card {
    background: #fff;
    border: 1px solid #dbeafe;
    border-radius: 18px;
    box-shadow: 0 18px 48px rgba(30, 64, 175, 0.07);
}

.course-panel {
    padding: 28px;
}

.course-panel-head {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 22px;
}

.course-panel-head > span {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 13px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    flex: 0 0 auto;
}

.course-panel h2 {
    font-size: 24px;
    color: #0f172a;
    margin-bottom: 5px;
}

.course-panel-head p {
    margin: 0;
    color: #64748b;
}

.course-facts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 22px;
}

.course-facts div {
    padding: 16px;
    border-radius: 14px;
    background: linear-gradient(180deg, #eff6ff, #ffffff);
    border: 1px solid #dbeafe;
}

.course-facts small {
    display: block;
    color: #64748b;
    font-size: 12px;
    margin-bottom: 8px;
}

.course-facts strong {
    color: #0f172a;
    line-height: 1.45;
}

.course-rich-text {
    color: #334155;
    line-height: 1.9;
    font-size: 15px;
}

.course-highlight-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.course-highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px;
    border-radius: 14px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #334155;
}

.course-highlight-item i {
    color: #f59e0b;
    margin-top: 3px;
}

.course-path {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 18px;
}

.course-path div {
    padding: 18px;
    border-radius: 16px;
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    color: #fff;
}

.course-path strong {
    display: block;
    font-family: var(--font-family-numbers);
    opacity: 0.72;
    margin-bottom: 8px;
}

.course-related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.course-related-card {
    display: block;
    overflow: hidden;
    border-radius: 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.course-related-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(37, 99, 235, 0.12);
}

.course-related-card img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    display: block;
}

.course-related-card div {
    padding: 14px;
}

.course-related-card strong,
.course-related-card span {
    display: block;
}

.course-related-card strong {
    color: #0f172a;
    margin-bottom: 6px;
}

.course-related-card span {
    color: #64748b;
    font-size: 13px;
}

.course-detail-aside {
    position: sticky;
    top: 128px;
}

.course-consult-card {
    padding: 26px;
}

.consult-badge {
    display: inline-flex;
    padding: 6px 10px;
    border-radius: 999px;
    background: #fff7ed;
    color: #ea580c;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 14px;
}

.course-consult-card h2 {
    color: #0f172a;
    font-size: 26px;
    margin-bottom: 8px;
}

.course-consult-card p {
    color: #64748b;
    line-height: 1.7;
    margin-bottom: 18px;
}

.course-consult-form {
    display: grid;
    gap: 12px;
}

.course-consult-form input,
.course-consult-form select {
    width: 100%;
    height: 44px;
    border: 1px solid #dbe4ef;
    border-radius: 10px;
    padding: 0 13px;
    outline: none;
}

.course-phone {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    color: #2563eb;
    font-weight: 800;
    text-decoration: none;
}

@media (max-width: 1024px) {
    .course-detail-grid {
        grid-template-columns: 1fr;
    }

    .course-detail-hero-grid,
    .course-detail-layout {
        grid-template-columns: 1fr;
    }

    .course-detail-aside {
        position: static;
    }

    .course-facts {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .course-detail-hero {
        padding-bottom: 48px;
    }

    .course-detail-hero h1 {
        font-size: 32px;
    }

    .course-detail-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .course-facts,
    .course-highlight-grid,
    .course-path,
    .course-related-grid {
        grid-template-columns: 1fr;
    }
}