/* ── Courses Overhaul CSS (Coassemble Inspired) ────────────────────────────────── */

:root {
    --part-motor-gradient: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    --part-motor-color: #f97316;
    --part-aux-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    --part-aux-color: #3b82f6;
    --part-elec-gradient: linear-gradient(135deg, #a855f7 0%, #9333ea 100%);
    --part-elec-color: #a855f7;
    --part-maint-gradient: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    --part-maint-color: #22c55e;
    --part-ship-gradient: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    --part-ship-color: #0ea5e9;
    --part-default-gradient: linear-gradient(135deg, #64748b 0%, #475569 100%);
    --part-default-color: #64748b;

    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.08);
}

/* ── Override page-container width for courses ──────────────────────────────── */
/* The global .page-container is max-width:1000px which is too narrow for a 3-col card grid */
.page-container:has(#courses-page.active),
.page-container.courses-wide {
    max-width: 1280px;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

@media (max-width: 768px) {

    .page-container:has(#courses-page.active),
    .page-container.courses-wide {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }
}

/* CTA link inside card footer */
.course-card-cta {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--part-aux-color, #3b82f6);
    white-space: nowrap;
    transition: color 0.2s;
}

.course-card:hover .course-card-cta {
    color: #fff;
}

/* Course Catalog Hero */
.courses-hero {
    text-align: center;
    padding: 2rem 1rem 1.5rem;
    position: relative;
    /* Removed overflow: hidden so the gradient glow isn't clipped into a hard rectangle */
}

@media (max-width: 600px) {
    .courses-hero {
        padding: 1.5rem 0.5rem 1rem;
    }
}

.courses-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
}

@media (max-width: 600px) {
    .courses-hero::before {
        width: 100%;
        height: 600px;
        background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    }
}

.courses-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.courses-hero p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

.courses-stats {
    display: inline-flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 1.25rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    padding: 0.8rem 2rem;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    width: 100%;
    max-width: 400px;
    /* Constrain width on mobile so it doesn't overflow */
    box-sizing: border-box;
}

@media (max-width: 600px) {
    .courses-stats {
        gap: 1rem;
        padding: 0.8rem 1rem;
    }
}

.courses-stats .stat-item {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.courses-stats .stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    line-height: 1;
}

.courses-stats .stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

/* Part Filter Tabs */
.course-part-tabs {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
    padding: 0 1rem;
}

.course-part-tab {
    padding: 0.6rem 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.course-part-tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.course-part-tab.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

/* Course catalog wrapper: use full width so grid can always fit 3 columns when space allows */
.courses-catalog-wrap {
    width: 100%;
    min-width: 0;
}

/* Course Card Grid – fixed columns so every row stays 3 (or 2/1 on smaller widths) */
.course-cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 3rem;
    padding: 0 0.5rem;
    width: 100%;
    min-width: 0;
}

@media (min-width: 600px) {
    .course-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .course-cards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.course-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    position: relative;
    backdrop-filter: blur(10px);
}

.course-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

.course-card-header {
    height: 80px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* Gradients per part */
.course-card[data-part="mek_motor"] .course-card-header {
    background: var(--part-motor-gradient);
}

.course-card[data-part="mek_general"] .course-card-header {
    background: var(--part-aux-gradient);
}

.course-card[data-part="met"] .course-card-header {
    background: var(--part-elec-gradient);
}

.course-card[data-part="mep"] .course-card-header {
    background: var(--part-maint-gradient);
}

.course-card[data-part="scs"] .course-card-header {
    background: var(--part-ship-gradient);
}

.course-card[data-part="ssep"] .course-card-header {
    background: var(--part-default-gradient);
}

.course-card[data-part="default"] .course-card-header {
    background: var(--part-default-gradient);
}

/* Icons per part */
.card-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.course-lesson-count {
    position: absolute;
    bottom: -12px;
    right: 1.25rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    z-index: 2;
}

.course-card-body {
    padding: 1.25rem 1rem 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 0.5rem;
    line-height: 1.3;
}

.course-card-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card-footer {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.course-progress-container {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.course-progress-fill {
    height: 100%;
    background: var(--accent-primary);
    border-radius: 999px;
    transition: width 0.5s ease;
}

.course-progress-text {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 600;
}

/* Course Viewer Layout */
.course-viewer {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    min-height: 75vh;
    margin-top: 1rem;
}

.course-sidebar {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 100px);
    position: sticky;
    top: 90px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.course-sidebar-header {
    padding: 1.25rem;
    background: linear-gradient(to bottom, var(--bg-tertiary), var(--bg-secondary));
    border-bottom: 1px solid var(--border-color);
}

.course-sidebar-back {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: color 0.2s;
}

.course-sidebar-back:hover {
    color: var(--text-primary);
}

.course-sidebar-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

.course-lesson-list {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex: 1;
}

.course-lesson-item {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
    position: relative;
}

.course-lesson-item:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.course-lesson-item.active {
    background: rgba(59, 130, 246, 0.1);
    color: #fff;
    font-weight: 600;
}

.course-lesson-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent-primary);
}

.lesson-number {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-tertiary);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.course-lesson-item.active .lesson-number {
    background: var(--accent-primary);
    color: #fff;
}

.course-lesson-item.completed .lesson-number {
    background: #22c55e;
    color: #fff;
}

.lesson-title-text {
    flex: 1;
}

/* Course Content Area */
.course-content-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem 2.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    min-width: 0;
    /* Prevent grid overflow */
    overflow-x: hidden;
}

.course-content-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.course-content-header h2 {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
}

/* Enhanced Content Styling (Gemini Output) */
.course-lesson-content {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.lesson-section {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.lesson-section h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.lesson-explanation {
    background: rgba(59, 130, 246, 0.05);
    border-color: rgba(59, 130, 246, 0.1);
}

.lesson-explanation h3 {
    color: #60a5fa;
}

.lesson-keypoints {
    background: rgba(168, 85, 247, 0.05);
    border-color: rgba(168, 85, 247, 0.1);
}

.lesson-keypoints h3 {
    color: #c084fc;
}

.lesson-keypoints ul {
    padding-left: 1.5rem;
    margin: 0;
}

.lesson-keypoints li {
    margin-bottom: 0.5rem;
}

.lesson-trap {
    background: rgba(245, 158, 11, 0.05);
    border-color: rgba(245, 158, 11, 0.2);
    border-left: 4px solid #f59e0b;
}

.lesson-trap h3 {
    color: #fbbf24;
}

.trap-question,
.trap-wrong,
.trap-correct {
    margin-bottom: 0.75rem;
    padding: 0.75rem;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.2);
}

.trap-wrong {
    border-left: 3px solid #ef4444;
}

.trap-correct {
    border-left: 3px solid #10b981;
}

.lesson-examtip {
    background: rgba(16, 185, 129, 0.05);
    border-color: rgba(16, 185, 129, 0.1);
}

.lesson-examtip h3 {
    color: #34d399;
}

/* Lesson Navigation */
.course-lesson-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.btn-nav {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.btn-nav:hover:not(:disabled) {
    background: var(--border-color);
    transform: translateY(-1px);
}

.btn-nav:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-complete {
    background: #16a34a;
    color: #fff;
    border: none;
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

.btn-complete:hover {
    background: #15803d;
    box-shadow: 0 6px 16px rgba(22, 163, 74, 0.4);
}

.btn-complete.done {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    box-shadow: none;
}

/* Mobile Responsive */
@media (max-width: 992px) {
    .course-viewer {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    /* Stack sidebar above content instead of off-canvas */
    .course-sidebar {
        position: static;
        width: 100%;
        max-height: 400px;
        /* Don't let it take the whole screen */
        border-radius: 16px;
        box-shadow: none;
    }

    .course-content-wrapper {
        padding: 1.25rem 1rem;
        border-radius: 12px;
    }

    .course-content-header h2 {
        font-size: 1.5rem;
        word-wrap: break-word;
    }

    .course-lesson-nav {
        flex-direction: column;
        gap: 1rem;
    }

    .btn-nav {
        width: 100%;
        justify-content: center;
    }
}

/* ── Coming Soon badge (sidebar + mobile nav) ────────────────────────────────── */
.sidebar-badge-coming-soon,
.nav-badge-coming-soon {
    display: inline-flex;
    align-items: center;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.5rem;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.25) 0%, rgba(129, 140, 248, 0.2) 100%);
    color: var(--accent-cyan, #38bdf8);
    border: 1px solid rgba(56, 189, 248, 0.45);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.15);
    white-space: nowrap;
}

.sidebar-link .sidebar-badge-coming-soon {
    margin-left: auto;
}

.nav-dropdown-item .nav-badge-coming-soon {
    margin-left: 0.35rem;
}

.sidebar-link:hover .sidebar-badge-coming-soon,
.nav-dropdown-item:hover .nav-badge-coming-soon {
    box-shadow: 0 0 16px rgba(56, 189, 248, 0.25);
    border-color: rgba(56, 189, 248, 0.6);
}

@media (max-width: 640px) {
    .nav-badge-coming-soon {
        font-size: 0.6rem;
        padding: 0.15rem 0.4rem;
    }
}

/* ── Coming Soon (big launch feel) ───────────────────────────────────────────── */
.courses-coming-soon {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    position: relative;
    overflow: hidden;
}

.courses-coming-soon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(90vw, 600px);
    height: min(90vw, 600px);
    background: radial-gradient(circle, rgba(56, 189, 248, 0.2) 0%, rgba(129, 140, 248, 0.12) 40%, transparent 70%);
    z-index: 0;
    pointer-events: none;
    animation: courses-glow-pulse 4s ease-in-out infinite;
}

.courses-coming-soon::after {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
    z-index: 0;
    pointer-events: none;
}

@keyframes courses-glow-pulse {

    0%,
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 0.7;
        transform: translate(-50%, -50%) scale(1.05);
    }
}

.courses-coming-soon-inner {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 560px;
    width: 100%;
}

.courses-coming-soon-icon {
    width: 88px;
    height: 88px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.2) 0%, rgba(129, 140, 248, 0.2) 100%);
    border: 1px solid rgba(56, 189, 248, 0.35);
    border-radius: 24px;
    box-shadow: 0 0 40px rgba(56, 189, 248, 0.15);
    animation: courses-icon-float 3s ease-in-out infinite;
}

@keyframes courses-icon-float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }
}

.courses-coming-soon-icon svg {
    width: 44px;
    height: 44px;
    stroke: var(--accent-cyan, #38bdf8);
    opacity: 0.95;
}

.courses-coming-soon h1 {
    font-size: clamp(1.85rem, 5vw, 2.5rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.courses-coming-soon-badge {
    display: inline-block;
    margin-bottom: 1.25rem;
    padding: 0.5rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-cyan, #38bdf8);
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(129, 140, 248, 0.1) 100%);
    border: 1px solid rgba(56, 189, 248, 0.4);
    border-radius: 999px;
    box-shadow: 0 0 24px rgba(56, 189, 248, 0.2);
    animation: courses-badge-shine 2.5s ease-in-out infinite;
}

@keyframes courses-badge-shine {

    0%,
    100% {
        box-shadow: 0 0 24px rgba(56, 189, 248, 0.2);
    }

    50% {
        box-shadow: 0 0 32px rgba(56, 189, 248, 0.35);
    }
}

.courses-coming-soon-desc {
    color: var(--text-secondary, #94a3b8);
    font-size: clamp(0.95rem, 2.2vw, 1.1rem);
    line-height: 1.65;
    margin-bottom: 1.5rem;
}

.courses-coming-soon-teaser {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1.5rem;
    padding: 0.75rem 1.25rem;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    font-size: 0.9rem;
    color: var(--text-tertiary, #64748b);
}

.courses-coming-soon-teaser span {
    color: var(--accent-cyan, #38bdf8);
    font-weight: 600;
}

@media (max-width: 640px) {
    .courses-coming-soon {
        min-height: 60vh;
        padding: 2rem 1rem;
    }

    .courses-coming-soon-icon {
        width: 72px;
        height: 72px;
        margin-bottom: 1.25rem;
        border-radius: 20px;
    }

    .courses-coming-soon-icon svg {
        width: 36px;
        height: 36px;
    }

    .courses-coming-soon-badge {
        padding: 0.4rem 1rem;
        font-size: 0.8rem;
    }

    .courses-coming-soon-teaser {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
}