/* ==========================================================================
   Simple Course Plugin — front-end styles
   Premium design system: warm indigo core, restrained gold accent for
   "money moments" (purchase CTA, certificate), light + dark themes, subtle
   motion. Everything is scoped under .scp-container so it never leaks into
   the surrounding theme.
   ========================================================================== */

.scp-container,
.scp-container * {
    box-sizing: border-box;
}

.scp-container {
    /* ---- design tokens (light theme) ---- */
    --scp-accent-600: #4f46e5;
    --scp-accent-700: #4338ca;
    --scp-accent-500: #6366f1;
    --scp-accent-400: #818cf8;
    --scp-accent-soft: rgba(79, 70, 229, 0.1);
    --scp-gold-500: #b8860b;
    --scp-gold-600: #a3730a;
    --scp-gold-soft: rgba(184, 134, 11, 0.12);
    --scp-success-500: #10b981;
    --scp-success-600: #059669;
    --scp-success-soft: rgba(16, 185, 129, 0.13);
    --scp-danger-500: #ef4444;
    --scp-danger-600: #b91c1c;
    --scp-danger-soft: rgba(239, 68, 68, 0.12);
    --scp-warning-600: #b45309;
    --scp-warning-soft: rgba(217, 119, 6, 0.12);

    --scp-bg: #ffffff;
    --scp-bg-soft: #f8fafc;
    --scp-bg-inset: #f1f5f9;
    --scp-border: #e6e9f0;
    --scp-border-soft: #eef1f6;
    --scp-text: #111827;
    --scp-text-muted: #64748b;
    --scp-text-faint: #94a3b8;

    --scp-radius-lg: 22px;
    --scp-radius-md: 16px;
    --scp-radius-sm: 11px;
    --scp-radius-pill: 999px;

    --scp-shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 20px 40px -20px rgba(30, 41, 59, 0.22);
    --scp-shadow-pop: 0 10px 24px -8px rgba(79, 70, 229, 0.38);
    --scp-shadow-gold: 0 10px 24px -8px rgba(184, 134, 11, 0.4);
    --scp-shadow-focus: 0 0 0 4px var(--scp-accent-soft);

    --scp-ease: cubic-bezier(0.16, 1, 0.3, 1);

    max-width: 820px;
    margin: 24px auto;
    background: var(--scp-bg);
    border-radius: var(--scp-radius-lg);
    box-shadow: var(--scp-shadow-card);
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    color: var(--scp-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    position: relative;
}

/* ---- dark theme: mirrors the viewer's OS/browser preference ---- */
@media (prefers-color-scheme: dark) {
    .scp-container {
        --scp-bg: #12141f;
        --scp-bg-soft: #171a29;
        --scp-bg-inset: #1c2033;
        --scp-border: #262b42;
        --scp-border-soft: #232739;
        --scp-text: #f1f2f8;
        --scp-text-muted: #9aa1c2;
        --scp-text-faint: #6b7196;
        --scp-shadow-card: 0 1px 0 rgba(255, 255, 255, 0.03), 0 30px 60px -25px rgba(0, 0, 0, 0.65);
    }
}

@media (prefers-reduced-motion: reduce) {
    .scp-container * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---- header: layered mesh gradient with a soft top highlight ---- */
.scp-header {
    position: relative;
    background:
        radial-gradient(120% 180% at 15% -20%, rgba(255, 255, 255, 0.22), transparent 55%),
        radial-gradient(90% 140% at 100% 120%, rgba(184, 134, 11, 0.35), transparent 60%),
        linear-gradient(135deg, var(--scp-accent-700), var(--scp-accent-500));
    color: #ffffff;
    padding: 38px 28px 32px;
    text-align: center;
    overflow: hidden;
}

.scp-header::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.14), transparent 40%);
    pointer-events: none;
}

.scp-header h1 {
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 8px;
    position: relative;
}

.scp-header p {
    opacity: 0.88;
    font-size: 0.92rem;
    letter-spacing: 0.01em;
    margin: 0;
    position: relative;
}

.scp-content {
    padding: 30px 28px 8px;
}

.scp-section {
    margin-bottom: 34px;
    animation: scp-rise 0.45s var(--scp-ease) both;
}

.scp-section:nth-of-type(1) { animation-delay: 0.02s; }
.scp-section:nth-of-type(2) { animation-delay: 0.06s; }
.scp-section:nth-of-type(3) { animation-delay: 0.1s; }
.scp-section:nth-of-type(4) { animation-delay: 0.14s; }
.scp-section:nth-of-type(n+5) { animation-delay: 0.16s; }

/* Note: this only nudges position, never opacity — content must never be
   invisible while waiting on an animation (slow paint, JS-disabled
   screenshots/scrapers, no-CSS states, etc. should all still show it). */
@keyframes scp-rise {
    from { transform: translateY(10px); }
    to   { transform: translateY(0); }
}

.scp-section h2 {
    font-size: 1.12rem;
    font-weight: 700;
    letter-spacing: -0.005em;
    margin: 0 0 14px;
    color: var(--scp-text);
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ---- step / lesson number badge ---- */
.scp-step-badge {
    background: linear-gradient(145deg, var(--scp-accent-500), var(--scp-accent-700));
    color: #ffffff;
    width: 30px;
    height: 30px;
    min-width: 30px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    box-shadow: 0 4px 10px -3px rgba(79, 70, 229, 0.55);
    position: relative;
    transition: box-shadow 0.3s var(--scp-ease);
}

.scp-step-badge-icon {
    font-size: 0.95rem;
    background: linear-gradient(145deg, var(--scp-accent-400), var(--scp-accent-600));
}

/* completed lesson: gold-green ring + a small check badge on the number */
.scp-lesson.scp-lesson-complete .scp-lesson-badge {
    box-shadow: 0 0 0 3px var(--scp-bg), 0 0 0 5px var(--scp-success-500), 0 6px 14px -4px rgba(16, 185, 129, 0.5);
}

.scp-lesson.scp-lesson-complete .scp-lesson-badge::after {
    content: '';
    position: absolute;
    bottom: -3px;
    right: -3px;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--scp-success-500);
    border: 2px solid var(--scp-bg);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25);
}

.scp-lesson.scp-lesson-complete .scp-lesson-badge::before {
    content: '';
    position: absolute;
    bottom: 0.5px;
    right: -0.5px;
    width: 6px;
    height: 3.5px;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg);
    z-index: 1;
}

/* ---- video ---- */
.scp-video-frame {
    background: #05070d;
    border-radius: 14px;
    padding: 6px;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 16px 30px -18px rgba(0, 0, 0, 0.55);
}

.scp-container video {
    width: 100%;
    display: block;
    border-radius: 9px;
    background: #000;
}

.scp-note {
    font-size: 0.84rem;
    color: var(--scp-text-faint);
    margin-top: 9px;
}

.scp-container label {
    display: block;
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--scp-text-muted);
    margin-bottom: 8px;
}

.scp-container input[type='text'],
.scp-container input[type='file'] {
    width: 100%;
    padding: 12px 14px;
    background: var(--scp-bg-soft);
    border: 1px solid var(--scp-border);
    border-radius: var(--scp-radius-sm);
    font-size: 1rem;
    color: var(--scp-text);
    margin-bottom: 12px;
    transition: border-color 0.2s var(--scp-ease), box-shadow 0.2s var(--scp-ease), background 0.2s var(--scp-ease);
}

.scp-container input[type='text']:focus {
    outline: none;
    background: var(--scp-bg);
    border-color: var(--scp-accent-500);
    box-shadow: var(--scp-shadow-focus);
}

.scp-container input[type='file'] {
    padding: 9px 10px;
    font-size: 0.9rem;
    color: var(--scp-text-muted);
}

/* ---- buttons ---- */
.scp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(145deg, var(--scp-accent-500), var(--scp-accent-700));
    color: #ffffff;
    border: none;
    padding: 13px 26px;
    border-radius: var(--scp-radius-sm);
    font-size: 0.96rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    text-decoration: none;
    box-shadow: var(--scp-shadow-pop);
    transition: transform 0.2s var(--scp-ease), box-shadow 0.2s var(--scp-ease), filter 0.2s var(--scp-ease);
}

.scp-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.06);
    box-shadow: 0 14px 28px -8px rgba(79, 70, 229, 0.48);
    color: #ffffff;
}

.scp-btn:active {
    transform: translateY(0);
}

.scp-btn:focus-visible {
    outline: none;
    box-shadow: var(--scp-shadow-pop), var(--scp-shadow-focus);
}

.scp-btn:disabled {
    background: var(--scp-bg-inset);
    color: var(--scp-text-faint);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.scp-btn-success {
    background: linear-gradient(145deg, var(--scp-success-500), var(--scp-success-600));
    box-shadow: 0 10px 24px -8px rgba(16, 185, 129, 0.45);
}

.scp-btn-success:hover {
    box-shadow: 0 14px 28px -8px rgba(16, 185, 129, 0.5);
}

/* the "money moment" buttons — certificate + purchase — get a restrained
   gold treatment so they read as the premium call to action on the page */
.scp-btn-premium {
    background: linear-gradient(145deg, #caa227, var(--scp-gold-500));
    box-shadow: var(--scp-shadow-gold);
    color: #241c02;
}

.scp-btn-premium:hover {
    box-shadow: 0 14px 30px -8px rgba(184, 134, 11, 0.55);
    color: #241c02;
}

.scp-status {
    margin-top: 14px;
    padding: 12px 16px;
    border-radius: var(--scp-radius-sm);
    font-size: 0.92rem;
    display: none;
}

.scp-status.success {
    background: var(--scp-success-soft);
    color: var(--scp-success-600);
    display: block;
}

.scp-status.error {
    background: var(--scp-danger-soft);
    color: var(--scp-danger-600);
    display: block;
}

/* ---- progress ---- */
.scp-progress-wrapper {
    margin-bottom: 30px;
    background: var(--scp-bg-soft);
    border: 1px solid var(--scp-border-soft);
    border-radius: var(--scp-radius-md);
    padding: 16px 18px;
}

.scp-progress-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--scp-text-muted);
}

.scp-progress-detail {
    font-weight: 400;
    color: var(--scp-text-faint);
    margin-left: 4px;
}

.scp-progress-percent {
    color: var(--scp-accent-600);
    font-weight: 700;
}

.scp-progress {
    height: 9px;
    background: var(--scp-bg-inset);
    border-radius: var(--scp-radius-pill);
    overflow: hidden;
}

.scp-progress-bar {
    position: relative;
    height: 100%;
    background: linear-gradient(90deg, var(--scp-accent-600), var(--scp-accent-400));
    width: 0%;
    transition: width 0.5s var(--scp-ease);
    border-radius: var(--scp-radius-pill);
    overflow: hidden;
}

.scp-progress-bar::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, transparent 20%, rgba(255, 255, 255, 0.45) 45%, transparent 70%);
    background-size: 200% 100%;
    animation: scp-shimmer 2.4s ease-in-out infinite;
}

@keyframes scp-shimmer {
    0%   { background-position: 150% 0; }
    100% { background-position: -50% 0; }
}

/* ---- lesson status chips (video / assignment) ---- */
.scp-lesson-status-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 14px;
}

.scp-status-chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    padding: 6px 12px 6px 8px;
    border-radius: var(--scp-radius-pill);
    background: var(--scp-bg-soft);
    border: 1px solid var(--scp-border);
    color: var(--scp-text-faint);
    transition: background 0.25s var(--scp-ease), border-color 0.25s var(--scp-ease), color 0.25s var(--scp-ease);
}

.scp-status-chip-icon {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--scp-border);
    display: inline-block;
    position: relative;
    flex: none;
    transition: background 0.25s var(--scp-ease);
}

.scp-status-chip.is-done {
    background: var(--scp-success-soft);
    border-color: rgba(16, 185, 129, 0.35);
    color: var(--scp-success-600);
}

.scp-status-chip.is-done .scp-status-chip-icon {
    background: var(--scp-success-500);
}

.scp-status-chip.is-done .scp-status-chip-icon::after {
    content: '';
    position: absolute;
    left: 3.5px;
    top: 1.5px;
    width: 4px;
    height: 7px;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(45deg);
}

/* ---- admin's review verdict on an uploaded assignment ---- */
.scp-review-status {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: var(--scp-radius-sm);
    font-size: 0.88rem;
    line-height: 1.5;
}

.scp-review-status p {
    margin: 4px 0 0;
}

.scp-review-status.scp-review-pending {
    background: var(--scp-warning-soft);
    color: var(--scp-warning-600);
}

.scp-review-status.scp-review-approved {
    background: var(--scp-success-soft);
    color: var(--scp-success-600);
}

.scp-review-status.scp-review-rejected {
    background: var(--scp-danger-soft);
    color: var(--scp-danger-600);
}

/* ---- locked / paywall states ---- */
.scp-locked {
    text-align: center;
    background:
        radial-gradient(120% 160% at 50% -30%, var(--scp-gold-soft), transparent 60%),
        var(--scp-bg-soft);
    border: 1px solid var(--scp-border-soft);
    border-radius: var(--scp-radius-md);
    padding: 34px 26px;
    margin-bottom: 0;
}

.scp-locked h2 {
    justify-content: center;
}

.scp-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--scp-text);
    margin: 6px 0 14px;
}

.scp-subscribe-box {
    background: linear-gradient(120deg, var(--scp-accent-soft), rgba(184, 134, 11, 0.08));
    border: 1px solid var(--scp-border-soft);
    border-radius: var(--scp-radius-md);
    padding: 20px 22px;
    margin-bottom: 30px;
}

.scp-subscribe-box p {
    margin: 0;
}

.scp-btn-subscribe {
    background: linear-gradient(145deg, #8b5cf6, #6d28d9);
    box-shadow: 0 10px 24px -8px rgba(109, 40, 217, 0.45);
}

.scp-btn-subscribe:hover {
    box-shadow: 0 14px 28px -8px rgba(109, 40, 217, 0.5);
}

/* ---- chat ---- */
.scp-chat-thread {
    max-height: 320px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
    padding: 6px 8px 6px 2px;
}

.scp-chat-thread::-webkit-scrollbar {
    width: 6px;
}

.scp-chat-thread::-webkit-scrollbar-track {
    background: transparent;
}

.scp-chat-thread::-webkit-scrollbar-thumb {
    background: var(--scp-border);
    border-radius: var(--scp-radius-pill);
}

.scp-chat-empty {
    color: var(--scp-text-faint);
    font-size: 0.9rem;
    margin: 0;
}

.scp-chat-message {
    max-width: 80%;
    padding: 11px 15px;
    border-radius: 14px;
    background: var(--scp-bg-inset);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.scp-chat-student {
    align-self: flex-end;
    background: linear-gradient(145deg, var(--scp-accent-400), var(--scp-accent-600));
    color: #ffffff;
    border-bottom-right-radius: 4px;
}

.scp-chat-student .scp-chat-meta {
    color: rgba(255, 255, 255, 0.75);
}

.scp-chat-admin {
    align-self: flex-start;
    background: var(--scp-bg-inset);
    border-bottom-left-radius: 4px;
}

.scp-chat-meta {
    font-size: 0.73rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--scp-text-faint);
    margin-bottom: 4px;
}

.scp-chat-text {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.94rem;
}

.scp-chat-compose {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.scp-container textarea.scp-chat-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--scp-bg-soft);
    border: 1px solid var(--scp-border);
    border-radius: var(--scp-radius-sm);
    font-size: 0.96rem;
    font-family: inherit;
    color: var(--scp-text);
    resize: vertical;
    margin-bottom: 0;
    transition: border-color 0.2s var(--scp-ease), box-shadow 0.2s var(--scp-ease), background 0.2s var(--scp-ease);
}

.scp-container textarea.scp-chat-input:focus {
    outline: none;
    background: var(--scp-bg);
    border-color: var(--scp-accent-500);
    box-shadow: var(--scp-shadow-focus);
}

.scp-chat-compose .scp-chat-send {
    align-self: flex-end;
}

/* ---- footer ---- */
.scp-footer {
    text-align: center;
    padding: 20px;
    font-size: 0.78rem;
    letter-spacing: 0.02em;
    color: var(--scp-text-faint);
    border-top: 1px solid var(--scp-border-soft);
    background: var(--scp-bg-soft);
}

.scp-course-description {
    background: var(--scp-bg-soft);
    border: 1px solid var(--scp-border-soft);
    border-radius: var(--scp-radius-md);
    padding: 18px 22px;
    margin-bottom: 26px;
    color: var(--scp-text-muted);
    font-size: 0.95rem;
}

.scp-course-description p:last-child {
    margin-bottom: 0;
}

/* ---- lesson list (scrollable) — pick a lesson to display below ---- */
.scp-lesson-nav {
    margin-bottom: 20px;
    border: 1px solid var(--scp-border-soft);
    border-radius: var(--scp-radius-md);
    background: var(--scp-bg-soft);
    overflow: hidden;
}

.scp-lesson-nav-scroll {
    max-height: 264px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.scp-lesson-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 13px 16px;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--scp-border-soft);
    font-family: inherit;
    text-align: left;
    cursor: pointer;
    color: var(--scp-text);
    transition: background 0.2s var(--scp-ease);
}

.scp-lesson-nav-item:last-child {
    border-bottom: none;
}

.scp-lesson-nav-item:hover {
    background: var(--scp-bg-inset);
}

.scp-lesson-nav-item:focus-visible {
    outline: none;
    box-shadow: inset var(--scp-shadow-focus);
}

.scp-lesson-nav-item.is-active {
    background: var(--scp-accent-soft);
}

.scp-lesson-nav-number {
    flex: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--scp-bg-inset);
    color: var(--scp-text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
    transition: background 0.2s var(--scp-ease), color 0.2s var(--scp-ease);
}

.scp-lesson-nav-item.is-active .scp-lesson-nav-number {
    background: linear-gradient(145deg, var(--scp-accent-500), var(--scp-accent-700));
    color: #ffffff;
}

.scp-lesson-nav-text {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.scp-lesson-nav-title {
    font-weight: 600;
    font-size: 0.92rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.scp-lesson-nav-meta {
    font-size: 0.76rem;
    color: var(--scp-text-faint);
    display: flex;
    align-items: center;
    gap: 5px;
}

.scp-lesson-nav-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--scp-border);
    display: inline-block;
    margin-right: 1px;
}

.scp-lesson-nav-dot:not(:first-child) {
    margin-left: 8px;
}

.scp-lesson-nav-dot.is-done {
    background: var(--scp-success-500);
}

.scp-lesson-nav-check {
    flex: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    position: relative;
}

.scp-lesson-nav-item.is-complete .scp-lesson-nav-check {
    background: var(--scp-success-500);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.18);
}

.scp-lesson-nav-item.is-complete .scp-lesson-nav-check::after {
    content: '';
    position: absolute;
    left: 5.5px;
    top: 3px;
    width: 5px;
    height: 8px;
    border-right: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(40deg);
}

/* ---- lesson stage — one lesson shown at a time ---- */
.scp-lesson-stage {
    position: relative;
}

.scp-lesson {
    display: none;
    border: 1px solid var(--scp-border-soft);
    border-radius: var(--scp-radius-md);
    padding: 24px 24px 20px;
    background: var(--scp-bg);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
    animation: scp-rise 0.35s var(--scp-ease) both;
}

.scp-lesson.is-active {
    display: block;
}

.scp-lesson.scp-lesson-complete {
    border-color: rgba(16, 185, 129, 0.3);
}

.scp-lesson-heading {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.005em;
    margin: 0 0 14px;
    color: var(--scp-text);
    display: flex;
    align-items: center;
    gap: 12px;
}

.scp-lesson-description {
    color: var(--scp-text-muted);
    font-size: 0.93rem;
    margin: -4px 0 16px;
}

.scp-lesson-description p:last-child {
    margin-bottom: 0;
}

.scp-lesson-assignment {
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px dashed var(--scp-border);
}

.scp-lesson-assignment-label {
    font-weight: 600;
    font-size: 0.92rem;
    margin: 0 0 10px;
    color: var(--scp-text);
}

/* ---- prev / next controls inside the active lesson ---- */
.scp-lesson-stage-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--scp-border-soft);
}

.scp-lesson-stage-count {
    font-size: 0.8rem;
    color: var(--scp-text-faint);
    font-weight: 600;
    white-space: nowrap;
}

.scp-btn-ghost {
    background: var(--scp-bg-soft);
    color: var(--scp-text);
    box-shadow: none;
    border: 1px solid var(--scp-border);
    padding: 11px 20px;
}

.scp-btn-ghost:hover {
    background: var(--scp-bg-inset);
    box-shadow: none;
    color: var(--scp-text);
}

.scp-btn-ghost:disabled {
    background: var(--scp-bg-soft);
    border-color: var(--scp-border-soft);
}

/* ---- small screens ---- */
@media (max-width: 560px) {
    .scp-container {
        margin: 0;
        border-radius: 0;
    }

    .scp-content {
        padding: 24px 18px 8px;
    }

    .scp-header {
        padding: 30px 20px 26px;
    }

    .scp-lesson {
        padding: 20px 18px 16px;
    }

    .scp-lesson-nav-scroll {
        max-height: 224px;
    }

    .scp-lesson-nav-item {
        padding: 11px 12px;
    }

    .scp-lesson-stage-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .scp-lesson-stage-count {
        order: -1;
        width: 100%;
        text-align: center;
    }
}

/* Assignment upload progress bar */
.scp-upload-progress {
    display: none;
    height: 8px;
    margin: 6px 0 2px;
    overflow: hidden;
    background: #e2e8f0;
    border-radius: 999px;
}
.scp-upload-progress-bar {
    width: 0;
    height: 100%;
    background: #2563eb;
    border-radius: 999px;
    transition: width 0.2s linear;
}
@media (prefers-reduced-motion: reduce) {
    .scp-upload-progress-bar { transition: none; }
}

/* ==========================================================================
   Featured Courses showcase — [scp_featured_courses]
   Standalone (not inside .scp-container), so it defines its own tokens.
   ========================================================================== */
.scp-featured,
.scp-featured * {
    box-sizing: border-box;
}

.scp-featured {
    --scpf-accent: #4f46e5;
    --scpf-accent-dark: #4338ca;
    --scpf-bg: #ffffff;
    --scpf-bg-soft: #f1f5f9;
    --scpf-border: #e6e9f0;
    --scpf-text: #111827;
    --scpf-muted: #64748b;
    --scpf-gold: #a3730a;

    max-width: 1200px;
    margin: 24px auto;
    padding: 0 16px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--scpf-text);
}

@media (prefers-color-scheme: dark) {
    .scp-featured {
        --scpf-accent: #818cf8;
        --scpf-accent-dark: #6366f1;
        --scpf-bg: #161b26;
        --scpf-bg-soft: #1f2636;
        --scpf-border: #2a3244;
        --scpf-text: #f1f5f9;
        --scpf-muted: #94a3b8;
        --scpf-gold: #e0b04a;
    }
}

.scp-feat-heading {
    margin: 0 0 20px;
    font-size: 1.6rem;
    font-weight: 700;
}

.scp-feat-grid {
    display: grid;
    gap: 22px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
.scp-feat-cols-1 .scp-feat-grid { grid-template-columns: minmax(0, 1fr); max-width: 520px; margin: 0 auto; }
.scp-feat-cols-2 .scp-feat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.scp-feat-cols-4 .scp-feat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1000px) {
    .scp-feat-cols-3 .scp-feat-grid,
    .scp-feat-cols-4 .scp-feat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
    .scp-feat-grid,
    .scp-feat-cols-2 .scp-feat-grid,
    .scp-feat-cols-3 .scp-feat-grid,
    .scp-feat-cols-4 .scp-feat-grid { grid-template-columns: minmax(0, 1fr); }
}

.scp-feat-card {
    display: flex;
    flex-direction: column;
    background: var(--scpf-bg);
    border: 1px solid var(--scpf-border);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 16px 32px -20px rgba(30, 41, 59, 0.28);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.scp-feat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 24px 40px -18px rgba(79, 70, 229, 0.35);
}

.scp-feat-media {
    display: block;
    aspect-ratio: 16 / 10;
    background: linear-gradient(145deg, var(--scpf-accent), var(--scpf-accent-dark));
    overflow: hidden;
}
.scp-feat-img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.scp-feat-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: 3rem;
    opacity: 0.9;
}

.scp-feat-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 18px 20px 20px;
}
.scp-feat-title {
    margin: 0 0 8px;
    font-size: 1.15rem;
    line-height: 1.3;
    font-weight: 700;
    color: var(--scpf-text);
}
.scp-feat-blurb {
    margin: 0 0 14px;
    color: var(--scpf-muted);
    font-size: 0.95rem;
    line-height: 1.55;
}
.scp-feat-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    align-items: center;
    margin: auto 0 16px;
    font-size: 0.85rem;
    color: var(--scpf-muted);
}
.scp-feat-price {
    font-weight: 700;
    color: var(--scpf-gold);
}
.scp-feat-price del { opacity: 0.6; font-weight: 400; }
.scp-feat-price ins { text-decoration: none; }

.scp-feat-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: flex-start;
    padding: 11px 22px;
    border-radius: 11px;
    background: linear-gradient(145deg, var(--scpf-accent), var(--scpf-accent-dark));
    color: #ffffff;
    font-weight: 600;
    font-size: 0.93rem;
    text-decoration: none;
    transition: transform 0.2s ease, filter 0.2s ease;
}
.scp-feat-btn:hover,
.scp-feat-btn:focus-visible {
    transform: translateY(-2px);
    filter: brightness(1.08);
    color: #ffffff;
}

.scp-feat-warn,
.scp-feat-empty {
    margin: 0;
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(217, 119, 6, 0.12);
    color: #b45309;
    font-size: 0.85rem;
    line-height: 1.5;
}