:root {
    --ws-primary: #2196F3;
    --ws-primary-dark: #1976D2;
    --ws-bg: #ffffff;
    --ws-page-bg: #f5f7fa;
    --ws-border: #e5e7eb;
    --ws-text: #1e293b;
    --ws-muted: #64748b;
    --ws-radius: 2px;
}
.zv-wrap,
.zv-play-wrap,
.zhiyin-vip-wrapper,
.zhiyin-key-page {
    background: var(--ws-bg) !important;
}
.zv-play-wrap {
    min-height: calc(100vh - 140px);
    background:#fff;
}
.zv-play-page {
    width: 100%;
    max-width: 2000px;
    margin: 0 auto;
    padding: 24px 40px 50px;
    box-sizing: border-box;
}
.zv-play-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}
.zv-play-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: var(--ws-radius);
    border: 1px solid var(--ws-border);
    background: #fff;
    color: var(--ws-primary);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.zv-play-back:hover {
    color: var(--ws-primary-dark);
    border-color: var(--ws-primary);
    background: #eff6ff;
}
.zv-play-back svg {
    width: 18px;
    height: 18px;
}
.zv-play-course-meta {
    font-size: 14px;
    font-weight: 500;
    color: #475569;
}
.zv-play-course-meta strong {
    color: #1e293b;
    font-weight: 700;
}
.zv-play-layout {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.zv-play-media-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 380px;
    gap: 20px;
    align-items: start;
}
.zv-play-main {
    min-width: 0;
    min-height: 0;
    background:#fff;
    border: 1px solid #e5e7eb;
    border-radius:2px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
}
.zv-play-video-box {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #0f172a;
}
.zv-play-video-box video {
    width: 100%;
    height: 100%;
    display: block;
    background: #000;
    object-fit: contain;
}
.zv-play-video-box iframe.zv-play-video-embed {
    width: 100%;
    height: 100%;
    display: block;
    border: none;
    background: #000;
}
.zv-play-video-cover {
    position: absolute;
    inset: 0;
    z-index: 2;
    background-color: #0f172a;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 0.25s ease;
}
.zv-play-video-cover.is-hidden {
    opacity: 0;
    pointer-events: none;
}
.zv-play-video-lock {
    position: absolute;
    inset: 0;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    box-sizing: border-box;
    background: rgba(0, 0, 0, 0.78);
    transition: opacity 0.25s ease;
}
.zv-play-video-lock.is-hidden {
    opacity: 0;
    pointer-events: none;
}
.zv-play-lock-inner {
    max-width: 420px;
    text-align: center;
    color: #fff;
}
.zv-play-lock-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
}
.zv-play-lock-icon svg {
    width: 28px;
    height: 28px;
    stroke: #fff;
}
.zv-play-lock-msg {
    margin: 0 0 18px;
    font-size: 15px;
    line-height: 1.65;
    color: rgba(255, 255, 255, 0.95);
}
.zv-play-lock-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 148px;
    padding: 12px 28px;
    border: none;
    border-radius: var(--ws-radius);
    background: var(--ws-primary);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    box-shadow: none;
    transition: background 0.2s ease, transform 0.2s ease;
}
.zv-play-lock-btn:hover {
    background: var(--ws-primary-dark);
    transform: translateY(-1px);
}
.zv-play-lock-btn:disabled {
    opacity: 0.72;
    cursor: wait;
    transform: none;
}
.zv-play-lock-btn.is-vip {
    background: #f59e0b;
    color: #fff;
    box-shadow: none;
}
.zv-play-lock-btn.is-vip:hover {
    background: #d97706;
    box-shadow: none;
}
.zv-play-info {
    padding: 18px 20px 20px;
    background:#fff;
    border: 1px solid #e5e7eb;
    border-radius:2px;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
}
.zv-play-lesson-title {
    margin: 0 0 10px;
    font-size: 20px;
    font-weight: 700;
    color: #1e293b;
    line-height: 1.4;
}
.zv-play-lesson-desc {
    margin: 0;
    font-size: 14px;
    line-height: 1.7;
    color: #64748b;
}
.zv-play-lesson-desc:empty {
    display: none;
}
.zv-play-sidebar {
    width: 380px;
    max-width: 100%;
    min-height: 0;
    box-sizing: border-box;
    background:#fff;
    border: 1px solid #e5e7eb;
    border-radius:2px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
    display: flex;
    flex-direction: column;
}
.zv-play-sidebar-head {
    padding: 16px 18px;
    border-bottom: 1px solid #eef2f7;
    background: #fff;
}
.zv-play-sidebar-head h3 {
    margin: 0 0 4px;
    font-size: 16px;
    font-weight: 600;
    color: var(--ws-text);
}
.zv-play-catalog-path {
    margin: 0;
    font-size: 13px;
    color: #64748b;
    line-height: 1.5;
    word-break: break-word;
}
.zv-play-lesson-list {
    overflow-y: auto;
    flex: 1;
}
.zv-play-lesson-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    width: 100%;
    padding: 14px 16px;
    border: none;
    border-bottom: 1px solid #f1f5f9;
    background:#fff;
    text-align: left;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
}
.zv-play-lesson-item:hover {
    background: #f8fbff;
}
.zv-play-lesson-item.active {
    background: #eff6ff;
    box-shadow: inset 3px 0 0 #2196F3;
}
.zv-play-lesson-index {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: #e2e8f0;
    color: #475569;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.zv-play-lesson-item.active .zv-play-lesson-index {
    background: #2196F3;
    color: #fff;
}
.zv-play-lesson-text {
    flex: 1;
    min-width: 0;
}
.zv-play-lesson-text strong {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #334155;
    line-height: 1.45;
    margin-bottom: 4px;
}
.zv-play-lesson-item.active .zv-play-lesson-text strong {
    color: #1976D2;
}
.zv-play-item-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px 10px;
    margin-top: 6px;
    font-size: 12px;
    line-height: 1.5;
    color: #94a3b8;
}
.zv-play-item-tags-text {
    color: #94a3b8;
}
.zv-play-item-meta-sep {
    color: #cbd5e1;
}
.zv-play-item-duration {
    color: #94a3b8;
    font-weight: 500;
}
.zv-play-lesson-item.active .zv-play-item-duration {
    color: #2196F3;
}
@media (max-width: 1024px) {
    .zv-play-media-row {
        grid-template-columns: 1fr;
    }
    .zv-play-sidebar {
        width: 100%;
        height: auto !important;
        max-height: 420px;
    }
}
@media (max-width: 768px) {
    .zv-play-page { padding: 20px 20px 40px; }
    .zv-play-back { font-size: 15px; padding: 10px 16px; }
    .zv-play-lesson-title { font-size: 17px; }
}

.zv-wrap {
    min-height: calc(100vh - 140px);
    background: #ffffff;
    animation: zvFadeIn 0.5s ease;
}
@keyframes zvFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes zvFadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.zv-header-full {
    width: 100%;
    background: #ffffff;
    padding: 35px 0 0;
    position: relative;
}
.zv-header-full::before,
.zv-header-full::after,
.zv-header-deco {
    display: none;
}
.zv-header-inner {
    width: 100%;
    max-width: 2000px;
    margin: 0 auto;
    padding: 0 35px;
    box-sizing: border-box;
    text-align: center;
    animation: zvFadeInUp 0.6s ease;
}
.zv-page {
    width: 100%;
    max-width: 2000px;
    margin: 0 auto;
    padding: 0 35px 50px;
    box-sizing: border-box;
}
.zv-header-title {
    margin: 0 0 10px;
    font-size: 32px;
    font-weight: 500;
    color: #333;
    letter-spacing: 0;
}
.zv-header-desc {
    margin: 0 auto 28px;
    max-width: 760px;
    font-size: 14px;
    line-height: 1.7;
    color: #666;
}
.zv-search-box {
    max-width: 560px;
    margin: 0 auto 35px;
    position: relative;
}
.zv-search-input {
    width: 100%;
    padding: 10px 46px 10px 18px;
    border: 1px solid #d0d0d0;
    border-radius: var(--ws-radius);
    font-size: 13px;
    transition: border-color 0.2s;
    background: #ffffff;
    box-sizing: border-box;
    color: #333;
}
.zv-search-input:focus {
    outline: none;
    border-color: var(--ws-primary);
    box-shadow: none;
}
.zv-search-input::placeholder { color: #999; }
.zv-search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--ws-primary);
    border: none;
    border-radius: var(--ws-radius);
    color: #fff;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.zv-search-btn:hover {
    background: var(--ws-primary-dark);
    box-shadow: none;
}
.zv-main-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 25px;
    padding: 0;
}
.zv-tab {
    padding: 10px 24px;
    min-height: auto;
    background: #ffffff;
    border: 1px solid #e5e5e5;
    border-radius: var(--ws-radius);
    font-size: 14px;
    font-weight: 400;
    color: #666;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}
.zv-tab > span {
    font-size: 16px;
    line-height: 1;
}
.zv-tab:hover {
    border-color: var(--ws-primary);
    color: var(--ws-primary);
    background: #ffffff;
    transform: none;
    box-shadow: none;
}
.zv-tab.active {
    background: var(--ws-primary);
    border-color: var(--ws-primary);
    color: #fff;
    box-shadow: none;
    transform: none;
}
.zv-tab.active:hover {
    color: #fff;
    background: var(--ws-primary);
    box-shadow: none;
}
.zv-sub-nav-wrap {
    display: none;
    margin-bottom: 18px;
}
.zv-sub-nav-wrap.is-show {
    display: block;
}
.zv-sub-nav-panel {
    background: #f8f8f8;
    border: 1px solid #e5e5e5;
    border-radius: var(--ws-radius);
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 0;
    box-shadow: none;
}
.zv-sub-nav-row {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0;
}
.zv-sub-nav-row + .zv-sub-nav-row {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #e5e5e5;
}
.zv-sub-tab {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    min-height: auto;
    background: #ffffff;
    border: 1px solid #d0d0d0;
    border-radius: var(--ws-radius);
    font-size: 13px;
    font-weight: 400;
    color: #666;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: none;
    white-space: nowrap;
    backdrop-filter: none;
}
.zv-sub-nav-row[data-depth="0"] .zv-sub-tab {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: var(--ws-radius);
}
.zv-sub-nav-row[data-depth]:not([data-depth="0"]) .zv-sub-tab {
    padding: 6px 14px;
    font-size: 12px;
    border-radius: var(--ws-radius);
}
.zv-sub-tab:hover {
    background: #f0f7ff;
    border-color: var(--ws-primary);
    color: var(--ws-primary);
    transform: none;
    box-shadow: none;
}
.zv-sub-tab.active {
    background: var(--ws-primary);
    border-color: var(--ws-primary);
    color: #fff;
    font-weight: 400;
    box-shadow: none;
    transform: none;
}
.zv-sub-tab.active:hover {
    color: #fff;
    background: var(--ws-primary);
    border-color: var(--ws-primary);
}
.zv-sub-tab[data-sub="all"]:not(.active) {
    color: #666;
    border-color: #d0d0d0;
    background: #ffffff;
    font-weight: 500;
}
.zv-nav-empty-hint {
    padding: 14px 18px;
    margin: 0 0 8px;
    font-size: 14px;
    color: #666;
    background: #fff;
    border: 1px dashed #d0d0d0;
    border-radius: var(--ws-radius);
    text-align: center;
}
.zv-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}
.zv-card {
    background: #ffffff;
    border-radius: var(--ws-radius);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    border: 1px solid #e5e5e5;
    cursor: pointer;
    transition: box-shadow 0.2s, border-color 0.2s;
}
.zv-card:hover {
    transform: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    border-color: var(--ws-primary);
}
.zv-card-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #e2e8f0;
}
.zv-card-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
    user-select: none;
}
.zv-card-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.35) 0%, transparent 50%);
    pointer-events: none;
}
.zv-card-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 3;
    padding: 3px 10px;
    border-radius: var(--ws-radius);
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: var(--ws-primary);
    box-shadow: none;
}
.zv-card-tags-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 8px;
    min-height: 22px;
}
.zv-card-desc-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    flex: 1;
    min-width: 0;
}
.zv-card-desc-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius:2px;
    font-size: 11px;
    font-weight: 600;
    color: #fff;
}
.zv-card-duration {
    position: absolute;
    bottom: 8px;
    right: 10px;
    z-index: 3;
    padding: 5px 10px;
    border-radius: var(--ws-radius);
    font-size: 10px;
    color: #fff;
    background: rgba(117, 117, 117, 0.9);
}
.zv-card-body { padding: 12px; }
.zv-card-title {
    margin: 0 0 6px;
    font-size: 14px;
    font-weight: 500;
    color: #333;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.zv-card-desc {
    margin: 0 0 10px;
    font-size: 12px;
    color: #888;
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.zv-card-views {
    display: flex;
    align-items: center;
    gap: 3px;
    flex-shrink: 0;
    font-size: 11px;
    color: #999;
    white-space: nowrap;
}
.zv-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #f0f0f0;
}
.zv-lessons { font-size: 12px; color: #999; }
.zv-learn-btn {
    padding: 5px 12px;
    border: 1px solid var(--ws-primary);
    border-radius: var(--ws-radius);
    background: #fff;
    color: var(--ws-primary);
    font-size: 12px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.2s;
}
.zv-learn-btn:hover {
    background: var(--ws-primary);
    color: #fff;
}

.zv-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 56px 24px;
    background: #fff;
    border-radius: var(--ws-radius);
    border: 1px dashed var(--ws-border);
}
.zv-empty-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.55; }
.zv-empty-title { font-size: 16px; font-weight: 600; color: var(--ws-text); margin: 0 0 6px; }
.zv-empty-desc { font-size: 14px; color: var(--ws-muted); margin: 0; }

.zv-toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(-16px);
    padding: 12px 22px;
    background: #fff;
    color: var(--ws-text);
    border: 1px solid var(--ws-border);
    border-radius: var(--ws-radius);
    font-size: 14px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    z-index: 99999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
}
.zv-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
@media (max-width: 1400px) {
    .zv-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 1024px) {
    .zv-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .zv-header-full { padding: 28px 0 0; }
    .zv-header-inner { padding: 0 20px; }
    .zv-page { padding: 0 20px 40px; }
    .zv-header-title { font-size: 24px; }
    .zv-header-desc { font-size: 14px; margin-bottom: 22px; }
    .zv-search-input { padding: 10px 45px 10px 16px; font-size: 14px; }
    .zv-search-btn { width: 32px; height: 32px; }
    .zv-main-nav { gap: 10px; }
    .zv-tab { padding: 12px 22px; min-height: 44px; font-size: 14px; }
    .zv-tab > span { font-size: 16px; }
    .zv-sub-nav-panel { padding: 14px 16px; border-radius: 12px; }
    .zv-sub-nav-row { gap: 8px; }
    .zv-sub-nav-row[data-depth="0"] .zv-sub-tab { padding: 9px 18px; min-height: 38px; font-size: 13px; }
    .zv-sub-nav-row[data-depth]:not([data-depth="0"]) .zv-sub-tab { padding: 5px 14px; min-height: 30px; font-size: 12px; }
    .zv-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
}
@media (max-width: 480px) {
    .zv-grid { grid-template-columns: 1fr; }
}