/* =============================================================================
 * 学习资料页专属样式（learning.html）
 * 复用 style.css 的设计变量与通用组件（nav / hero / stats-bar / filter-btn 等）
 * ========================================================================== */

:root {
    --lr-bili: #fb7299;
    --lr-eeyxs: #f97316;
    --lr-done: #10b981;
}

/* ------------------------------ 路径概览 ------------------------------ */

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.roadmap-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    color: var(--text);
    text-decoration: none;
    overflow: hidden;
    transition: var(--transition);
}

.roadmap-card::before {
    content: '';
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    opacity: 0.85;
}

.roadmap-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(37, 99, 235, 0.32);
    color: var(--text);
}

.roadmap-step {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.roadmap-index {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 11px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
}

.roadmap-label {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--primary);
    text-transform: uppercase;
}

.roadmap-name {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.roadmap-desc {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.94rem;
    line-height: 1.7;
}

.roadmap-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.roadmap-topic {
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 600;
}

.roadmap-goal {
    margin-top: auto;
    padding: 0.75rem 0.9rem;
    border-radius: 12px;
    background: rgba(6, 182, 212, 0.07);
    border: 1px dashed rgba(6, 182, 212, 0.35);
    font-size: 0.86rem;
    color: #0e7490;
    line-height: 1.6;
}

.roadmap-goal-key {
    display: block;
    font-weight: 700;
    font-size: 0.74rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.roadmap-meta {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* ------------------------------ 学习进度 ------------------------------ */

.progress-section {
    max-width: var(--page-max);
    margin: 0 auto;
    padding: 1.5rem 2rem 2.25rem;
}

/* 进度条与下方筛选栏之间留出间距，并统一为全站 2rem 左对齐 */
#lr-controls.controls-sticky {
    margin-top: 0.5rem;
}

.progress-card {
    padding: 1.75rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.progress-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.progress-head h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
}

.progress-sub {
    margin: 0.4rem 0 0;
    color: var(--text-muted);
    font-size: 0.88rem;
}

.progress-figure {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.progress-percent {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.progress-count {
    margin-top: 0.3rem;
    font-size: 0.84rem;
    color: var(--text-muted);
    font-weight: 600;
}

.progress-track {
    margin-top: 1.25rem;
    height: 10px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.07);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.progress-reset {
    margin-top: 1rem;
    padding: 0.4rem 0.9rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.progress-reset:hover {
    border-color: #ef4444;
    color: #ef4444;
}

/* ------------------------------ 阶段分组 ------------------------------ */

.course-sections {
    display: flex;
    flex-direction: column;
    gap: 3.5rem;
}

.stage-section {
    scroll-margin-top: 150px;
}

.stage-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border);
}

.stage-head-left {
    display: flex;
    align-items: center;
    gap: 0.875rem;
}

.stage-badge {
    padding: 0.3rem 0.85rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.stage-title {
    margin: 0;
    font-size: clamp(1.5rem, 2.6vw, 1.95rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.stage-count {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
}

.stage-desc {
    margin: 1rem 0 1.75rem;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.75;
    max-width: 900px;
}

.course-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ------------------------------ 课程卡片 ------------------------------ */

.course-card {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 2rem;
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.course-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(37, 99, 235, 0.22);
}

.course-card.is-done {
    border-color: rgba(16, 185, 129, 0.4);
    background: linear-gradient(180deg, rgba(16, 185, 129, 0.035), transparent 55%);
}

.course-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.course-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.course-head-left {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.course-topic,
.course-level,
.course-platform {
    padding: 0.28rem 0.75rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
}

.course-topic {
    background: rgba(37, 99, 235, 0.09);
    color: var(--primary);
}

.level-basic {
    background: rgba(16, 185, 129, 0.1);
    color: #047857;
}

.level-adv {
    background: rgba(139, 92, 246, 0.1);
    color: #6d28d9;
}

.platform-bilibili {
    background: rgba(251, 114, 153, 0.12);
    color: #db4a7a;
}

.platform-eeyxs {
    background: rgba(249, 115, 22, 0.12);
    color: #c2410c;
}

/* 打卡 */
.course-done {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
}

.course-done-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.course-done-box {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 6px;
    background: #fff;
    color: transparent;
    transition: var(--transition);
}

.course-done-box svg {
    width: 13px;
    height: 13px;
}

.course-done-input:checked + .course-done-box {
    background: var(--lr-done);
    border-color: var(--lr-done);
    color: #fff;
}

.course-done-input:focus-visible + .course-done-box {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.course-done-text {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-muted);
}

.course-done-input:checked ~ .course-done-text {
    color: var(--lr-done);
}

.course-title {
    margin: 0.9rem 0 0;
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.45;
    letter-spacing: -0.01em;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem;
    margin-top: 0.7rem;
}

.course-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--text-muted);
}

.course-meta-item svg {
    width: 15px;
    height: 15px;
    flex-shrink: 0;
}

.course-summary {
    margin: 0.9rem 0 0;
    color: #475569;
    font-size: 0.95rem;
    line-height: 1.78;
}

.course-speaker {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 1.1rem;
    padding: 0.9rem 1rem;
    border-radius: 14px;
    background: rgba(15, 23, 42, 0.028);
    border: 1px solid var(--border);
}

.speaker-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
}

.speaker-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.speaker-name {
    font-size: 0.92rem;
    font-weight: 700;
}

.speaker-bio {
    margin-top: 0.15rem;
    font-size: 0.83rem;
    line-height: 1.65;
    color: var(--text-muted);
}

.course-series-note {
    margin: 0.8rem 0 0;
    font-size: 0.82rem;
    color: var(--text-muted);
    padding-left: 0.85rem;
    border-left: 3px solid rgba(37, 99, 235, 0.25);
    line-height: 1.6;
}

/* ------------------------------ 播放区 ------------------------------ */

.course-side {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-width: 0;
}

.course-player {
    position: relative;
    aspect-ratio: 16 / 9;
    border-radius: 16px;
    overflow: hidden;
    background: linear-gradient(150deg, #0c1220 0%, #16233c 55%, #0f172a 100%);
}

.course-player iframe {
    width: 100%;
    height: 100%;
    display: block;
    border: 0;
}

.course-player--bili {
    background-size: cover;
    background-position: center;
    background-color: #0c1220;
}

.player-poster {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    border: 0;
    background: transparent;
    color: #fff;
    font-family: inherit;
    cursor: pointer;
    padding: 1rem;
    text-decoration: none;
}

.player-poster-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(37, 99, 235, 0.38), transparent 60%),
        radial-gradient(ellipse at 75% 80%, rgba(6, 182, 212, 0.3), transparent 62%);
    transition: var(--transition);
}

.course-player--bili .player-poster-bg {
    background: rgba(0, 0, 0, 0.44);
}

.course-player:not(.course-player--bili) .player-poster::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

.player-play-icon {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 58px;
    height: 58px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.14);
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(8px);
    transition: var(--transition);
}

.player-play-icon svg {
    width: 24px;
    height: 24px;
    margin-left: 3px;
}

.player-poster:hover .player-play-icon {
    background: var(--lr-bili);
    border-color: var(--lr-bili);
    transform: scale(1.08);
}

.player-poster:hover .player-poster-bg {
    transform: scale(1.05);
}

.course-player--bili .player-poster:hover .player-poster-bg {
    transform: scale(1);
    background: rgba(0, 0, 0, 0.32);
}

.player-poster-text {
    position: relative;
    z-index: 1;
    font-size: 0.95rem;
    font-weight: 700;
}

.player-poster-sub {
    position: relative;
    z-index: 1;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.68);
}

.player-poster:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -4px;
}

/* 外链平台块（电源网研习社等） */
.course-external {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1.1rem;
    height: 100%;
    min-height: 190px;
    padding: 1.5rem;
    border-radius: 16px;
    background: linear-gradient(150deg, rgba(249, 115, 22, 0.06), rgba(37, 99, 235, 0.05));
    border: 1px dashed rgba(249, 115, 22, 0.35);
    text-align: center;
}

.course-external-info {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.course-external-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: #c2410c;
}

.course-external-note {
    font-size: 0.85rem;
    line-height: 1.65;
    color: var(--text-muted);
}

.course-actions {
    display: flex;
    justify-content: center;
}

.course-link-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    align-self: center;
    padding: 0.7rem 1.5rem;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.course-link-btn svg {
    width: 15px;
    height: 15px;
}

.course-link-btn:hover {
    background: var(--primary-light);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
}

.course-link-btn.ghost {
    padding: 0.45rem 1.1rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.82rem;
}

.course-link-btn.ghost:hover {
    background: transparent;
    border-color: var(--lr-bili);
    color: var(--lr-bili);
    box-shadow: none;
}

/* ------------------------------ 其他 ------------------------------ */

.lr-empty {
    padding: 4rem 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 1rem;
}

.lr-note-section {
    margin-top: 4rem;
}

.lr-note {
    padding: 1.75rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.lr-note h3 {
    margin: 0 0 1rem;
    font-size: 1.15rem;
    font-weight: 700;
}

.lr-note ul {
    margin: 0;
    padding-left: 1.15rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.lr-note li {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.75;
}

.lr-note strong {
    color: var(--text);
}

/* ------------------------------ 筛选栏增强 ------------------------------ */

#lr-controls .controls-inner {
    display: flex;
    flex-wrap: nowrap;
    gap: 1rem;
    align-items: center;
}

#lr-controls .search-wrap {
    flex: 1 1 380px;
    min-width: 260px;
}

#lr-controls .search-wrap input {
    width: 100%;
    height: 52px;
    padding: 0 1.2rem 0 3rem;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text);
    outline: none;
    transition: var(--transition);
}

#lr-controls .search-wrap input::placeholder {
    color: var(--text-muted);
}

#lr-controls .search-wrap input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

#lr-topic-filters {
    flex: 1 1 auto;
    display: flex;
    flex-wrap: nowrap;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(37, 99, 235, 0.3) transparent;
}

#lr-topic-filters::-webkit-scrollbar {
    height: 4px;
}

#lr-topic-filters::-webkit-scrollbar-thumb {
    background: rgba(37, 99, 235, 0.35);
    border-radius: 999px;
}

.lr-filter-btn {
    flex-shrink: 0;
}

/* ------------------------------ 响应式 ------------------------------ */

@media (max-width: 1080px) {
    .course-card {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .course-side {
        order: -1;
    }

    .course-external {
        min-height: 0;
    }
}

@media (max-width: 960px) {
    #lr-controls .controls-inner {
        flex-direction: column;
        align-items: stretch;
    }

    #lr-controls .search-wrap {
        flex: 1 1 auto;
        width: 100%;
    }

    #lr-topic-filters {
        flex-wrap: nowrap;
    }
}

@media (max-width: 720px) {
    .progress-section {
        padding: 1.25rem 1.25rem 0;
    }

    .progress-card,
    .lr-note {
        padding: 1.35rem 1.25rem;
    }

    .progress-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .progress-figure {
        align-items: flex-start;
    }

    .course-card {
        padding: 1.25rem;
    }

    .course-title {
        font-size: 1.15rem;
    }

    .stage-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.6rem;
    }

    .course-head {
        flex-direction: column-reverse;
        align-items: flex-start;
    }
}


/* ------------------------------ 延伸阅读 CTA ------------------------------ */

.lr-cta {
    margin-top: 2.5rem;
}

.lr-cta-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
    background: linear-gradient(120deg, rgba(37, 99, 235, 0.10), rgba(6, 182, 212, 0.10));
    border: 1px solid rgba(37, 99, 235, 0.22);
    border-radius: var(--radius);
    padding: 1.5rem 1.75rem;
    box-shadow: var(--shadow-sm);
}

.lr-cta-text h3 {
    margin: 0 0 0.5rem;
    font-size: 1.15rem;
}

.lr-cta-text p {
    margin: 0;
    max-width: 62ch;
    color: var(--text-muted);
    line-height: 1.7;
    font-size: 0.95rem;
}

.lr-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex: 0 0 auto;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    padding: 0.8rem 1.3rem;
    border-radius: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.lr-cta-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.lr-cta-btn svg { width: 18px; height: 18px; }

@media (max-width: 640px) {
    .lr-cta-card { flex-direction: column; align-items: flex-start; }
    .lr-cta-btn { width: 100%; justify-content: center; }
}