/* Course Overview styles using CSS layers */
@layer components {
    /* Navigation Styles */
    nav {
        position: fixed;
        inset-block-start: 0;
        inline-size: 100%;
        background: var(--nav-bg);
        border-block-end: 1px solid var(--border-color);
        backdrop-filter: blur(20px);
        z-index: 100;
        padding-block: 1rem;

        & .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        & .logo {
            font-size: 1.5rem;
            font-weight: 700;
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        & .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;

            & a {
                color: var(--text-secondary);
                text-decoration: none;
                font-weight: 600;
                transition: color 0.3s ease;

                &:hover {
                    color: var(--cyan);
                }
            }
        }

        & .nav-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
    }

    .theme-toggle {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        padding-block: 0.5rem;
        padding-inline: 1rem;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: 50px;
        cursor: pointer;
        transition: all 0.3s ease;
        color: var(--text-secondary);

        &:hover {
            border-color: var(--border-hover);
            transform: translateY(-2px);
        }

        & .theme-toggle-icon {
            font-size: 1.2rem;
        }

        & .theme-toggle-text {
            font-weight: 600;
            font-size: 0.9rem;
        }
    }

    .course-overview {
        margin-block-start: 80px;
        padding-block: 2rem;
        min-block-size: calc(100dvh - 80px); /* dvh accounts for mobile browser chrome */
        background: var(--bg-primary);
    }

    /* Course Header */
    .course-header {
        display: grid;
        grid-template-columns: 1fr auto;
        gap: 3rem;
        align-items: start;
        margin-block-end: 3rem;
        padding: 2rem;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: 20px;

        & .course-title-section {
            & h1 {
                font-size: 2.5rem;
                color: var(--text-primary);
                margin-block-end: 0.75rem;
            }

            & .course-description {
                font-size: 1.1rem;
                color: var(--text-secondary);
                line-height: 1.6;
                margin: 0;
            }
        }

        & .course-stats {
            display: flex;
            gap: 2rem;
        }

        & .stat-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            padding: 1.5rem;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            min-inline-size: 100px;

            & .stat-value {
                font-size: 2.5rem;
                font-weight: 700;
                color: var(--cyan);
            }

            & .stat-label {
                font-size: 0.85rem;
                color: var(--text-secondary);
                text-transform: uppercase;
                letter-spacing: 0.5px;
            }
        }
    }

    /* Section Header */
    .section-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-block-end: 1.5rem;

        & h2 {
            font-size: 1.75rem;
            color: var(--text-primary);
        }

        & .available-count {
            padding: 0.5rem 1.5rem;
            background: oklch(0.7 0.18 50 / 0.2);
            color: var(--orange);
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
        }
    }

    /* Review Pool Section */
    .pool-section {
        margin-block-end: 3rem;
    }

    .pool-card {
        display: grid;
        grid-template-columns: 1fr auto auto;
        gap: 2rem;
        align-items: center;
        padding: 2rem;
        background: var(--bg-card);
        border: 2px solid var(--border-color);
        border-radius: 20px;
        cursor: pointer;
        transition: all 0.3s ease;

        &:hover {
            border-color: var(--cyan);
            transform: translateY(-3px);
        }

        & .pool-info {
            display: flex;
            align-items: center;
            gap: 1.5rem;

            & .pool-icon {
                font-size: 3rem;
            }

            & .pool-details {
                & h3 {
                    font-size: 1.5rem;
                    color: var(--text-primary);
                    margin-block-end: 0.5rem;
                }

                & p {
                    font-size: 1rem;
                    color: var(--text-secondary);
                    margin: 0;
                }
            }
        }

        & .pool-stats {
            display: flex;
            gap: 1.5rem;
            flex-wrap: wrap;

            & .pool-stat {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 0.25rem;

                & .pool-stat-label {
                    font-size: 0.75rem;
                    font-weight: 600;
                    color: var(--text-secondary);
                    text-transform: uppercase;
                    letter-spacing: 0.5px;
                }

                & .pool-stat-value {
                    font-size: 1.75rem;
                    font-weight: 700;
                    color: var(--text-primary);
                }

                /* Legacy structure support */
                & .badge {
                    padding: 0.25rem 0.75rem;
                    border-radius: 12px;
                    font-size: 0.75rem;
                    font-weight: 700;
                    text-transform: uppercase;
                    letter-spacing: 0.5px;
                }

                & .count {
                    font-size: 1.5rem;
                    font-weight: 700;
                    color: var(--text-primary);
                }
            }

            & .pool-stat.apprentice .badge {
                background: oklch(0.85 0.19 35 / 0.2);
                color: var(--orange);
                border: 1px solid oklch(0.85 0.19 35 / 0.3);
            }

            & .pool-stat.guru .badge {
                background: oklch(0.8 0.2 280 / 0.2);
                color: var(--magenta);
                border: 1px solid oklch(0.8 0.2 280 / 0.3);
            }

            & .pool-stat.master .badge {
                background: oklch(0.7 0.12 210 / 0.2);
                color: var(--blue);
                border: 1px solid oklch(0.7 0.12 210 / 0.3);
            }
        }
    }

    /* Current Lesson Section */
    .current-lesson-section {
        margin-block-end: 3rem;
    }

    /* Completed Lessons Section */
    .completed-lessons-section {
        margin-block-end: 3rem;
    }

    .lessons-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
        gap: 1.5rem;
    }

    /* Lesson Card */
    .lesson-card {
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        padding: 2rem;
        background: var(--bg-card);
        border: 2px solid var(--border-color);
        border-radius: 20px;
        cursor: pointer;
        transition: all 0.3s ease;

        &:not(.locked):hover {
            border-color: var(--border-hover);
            transform: translateY(-3px);
        }

        &.locked {
            opacity: 0.6;
            cursor: not-allowed;
        }

        & .lesson-status {
            display: flex;
            justify-content: space-between;
            align-items: center;

            & .status-badge {
                padding: 0.5rem 1rem;
                border-radius: 12px;
                font-size: 0.85rem;
                font-weight: 700;
                text-transform: uppercase;
                letter-spacing: 0.5px;
                /* Default style when no modifier class */
                background: oklch(0.9 0.15 195 / 0.2);
                color: var(--cyan);
                border: 1px solid oklch(0.9 0.15 195 / 0.3);

                &.current {
                    background: oklch(0.9 0.15 195 / 0.2);
                    color: var(--cyan);
                    border: 1px solid oklch(0.9 0.15 195 / 0.3);
                }

                &.completed {
                    background: oklch(0.8 0.15 150 / 0.2);
                    color: var(--green);
                    border: 1px solid oklch(0.8 0.15 150 / 0.3);
                }

                &.locked {
                    background: var(--bg-secondary);
                    color: var(--text-tertiary);
                    border: 1px solid var(--border-color);
                }
            }

            & .new-badge {
                padding: 0.4rem 0.75rem;
                border-radius: 8px;
                font-size: 0.75rem;
                font-weight: 700;
                text-transform: uppercase;
                letter-spacing: 0.5px;
                background: linear-gradient(135deg, oklch(0.45 0.25 260), oklch(0.35 0.2 285));
                color: oklch(0.95 0.05 195);
                border: 1px solid oklch(0.55 0.2 270);
                box-shadow: 0 2px 8px oklch(0.45 0.25 260 / 0.4);
                animation: pulse-glow 2s ease-in-out infinite;
            }

            & .lesson-number {
                font-size: 0.85rem;
                color: var(--text-tertiary);
                font-weight: 600;
            }
        }

        & .lesson-content {
            flex: 1;

            & h3 {
                font-size: 1.5rem;
                color: var(--text-primary);
                margin-block-end: 0.75rem;
            }

            & .lesson-desc {
                font-size: 1rem;
                color: var(--text-secondary);
                line-height: 1.6;
                margin-block-end: 1rem;
            }

            & .lesson-progress {
                display: flex;
                flex-direction: column;
                gap: 0.5rem;

                & .progress-bar {
                    inline-size: 100%;
                    block-size: 8px;
                    background: var(--bg-secondary);
                    border-radius: 4px;
                    overflow: hidden;

                    & .progress-fill {
                        block-size: 100%;
                        background: var(--gradient-primary);
                        border-radius: 4px;
                        transition: width 0.6s ease;
                    }
                }

                & .progress-text {
                    font-size: 0.9rem;
                    color: var(--text-secondary);
                    font-weight: 600;
                }
            }

            & .lesson-stats-small {
                display: flex;
                gap: 1.5rem;
                margin-block-start: 1rem;

                & .stat {
                    font-size: 0.9rem;
                    color: var(--text-tertiary);
                }
            }
        }
    }

    /* Buttons */
    .btn-primary {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding-block: 1rem;
        padding-inline: 2rem;
        background: var(--gradient-primary);
        color: var(--bg-primary);
        border: none;
        border-radius: 12px;
        font-weight: 600;
        font-size: 1rem;
        cursor: pointer;
        transition: all 0.3s ease;

        & .arrow {
            font-size: 1.25rem;
            transition: transform 0.3s ease;
        }

        &:hover {
            transform: translateY(-2px);

            & .arrow {
                transform: translateX(5px);
            }
        }
    }

    .btn-secondary {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding-block: 1rem;
        padding-inline: 2rem;
        background: var(--bg-secondary);
        color: var(--text-primary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        font-weight: 600;
        font-size: 1rem;
        cursor: pointer;
        transition: all 0.3s ease;

        & .arrow {
            font-size: 1.25rem;
            transition: transform 0.3s ease;
        }

        &:hover {
            border-color: var(--border-hover);

            & .arrow {
                transform: translateX(5px);
            }
        }
    }

    .btn-outline {
        inline-size: 100%;
        padding-block: 0.75rem;
        padding-inline: 1.5rem;
        background: transparent;
        color: var(--text-secondary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        font-weight: 600;
        font-size: 0.95rem;
        cursor: pointer;
        transition: all 0.3s ease;

        &:hover:not(:disabled) {
            border-color: var(--cyan);
            color: var(--cyan);
        }

        &:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
    }

    .primary-button {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
        padding-block: 0.75rem;
        padding-inline: 1.5rem;
        background: var(--gradient-primary);
        color: var(--bg-primary);
        border: none;
        border-radius: 12px;
        font-weight: 600;
        font-size: 0.95rem;
        cursor: pointer;
        transition: all 0.3s ease;

        &:hover:not(:disabled) {
            transform: translateY(-2px);
        }

        &:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
    }

    .secondary-button {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
        padding-block: 0.75rem;
        padding-inline: 1.5rem;
        background: var(--bg-card);
        color: var(--text-primary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        font-weight: 600;
        font-size: 0.95rem;
        cursor: pointer;
        transition: all 0.3s ease;

        &:hover:not(:disabled) {
            border-color: var(--cyan);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px oklch(0 0 0 / 0.1);
        }

        &:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
    }

    .btn-danger {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
        padding-block: 0.75rem;
        padding-inline: 1.5rem;
        background: oklch(0.3 0.1 30 / 0.2);
        color: oklch(0.75 0.15 30);
        border: 1px solid oklch(0.5 0.12 30 / 0.4);
        border-radius: 12px;
        font-weight: 600;
        font-size: 0.95rem;
        cursor: pointer;
        transition: all 0.3s ease;

        &:hover:not(:disabled) {
            background: oklch(0.35 0.12 30 / 0.3);
            border-color: oklch(0.6 0.15 30);
            color: oklch(0.8 0.18 30);
            transform: translateY(-2px);
        }

        &:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
    }

    /* User Menu */
    .user-menu {
        position: relative;
    }

    .user-button {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        padding-block: 0.5rem;
        padding-inline: 1rem;
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: 50px;
        cursor: pointer;
        transition: all 0.3s ease;
        color: var(--text-primary);

        &:hover {
            border-color: var(--border-hover);
            transform: translateY(-2px);
        }
    }

    .user-avatar {
        inline-size: 32px;
        block-size: 32px;
        border-radius: 50%;
        background: var(--gradient-primary);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 0.9rem;
        color: var(--bg-primary);
    }

    .user-dropdown {
        position: absolute;
        inset-block-start: calc(100% + 0.5rem);
        inset-inline-end: 0;
        min-inline-size: 200px;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        box-shadow: 0 20px 60px oklch(0 0 0 / 0.2);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
        z-index: 1000;

        &.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        & a {
            display: block;
            padding-block: 0.75rem;
            padding-inline: 1.25rem;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.2s ease;

            &:hover {
                background: var(--bg-primary);
                color: var(--cyan);
            }

            &:first-child {
                border-start-start-radius: 12px;
                border-start-end-radius: 12px;
            }

            &:last-child {
                border-end-start-radius: 12px;
                border-end-end-radius: 12px;
            }
        }

        & hr {
            border: none;
            border-block-start: 1px solid var(--border-color);
            margin: 0;
        }
    }
}

@layer overrides {
    [data-theme="dark"] .course-header,
    [data-theme="dark"] .pool-card {
        box-shadow: 0 20px 60px oklch(0.9 0.15 195 / 0.15);
    }

    [data-theme="light"] .course-header,
    [data-theme="light"] .pool-card {
        box-shadow: 0 20px 60px oklch(0.7 0.12 210 / 0.1);
    }

    [data-theme="dark"] .pool-card:hover,
    [data-theme="dark"] .lesson-card:not(.locked):hover {
        box-shadow: 0 25px 70px oklch(0.9 0.15 195 / 0.25);
    }

    [data-theme="light"] .pool-card:hover,
    [data-theme="light"] .lesson-card:not(.locked):hover {
        box-shadow: 0 25px 70px oklch(0.7 0.12 210 / 0.15);
    }

    [data-theme="dark"] .btn-primary {
        box-shadow: 0 0 20px oklch(0.9 0.15 195 / 0.3);

        &:hover {
            box-shadow: 0 0 30px oklch(0.9 0.15 195 / 0.5);
        }
    }

    [data-theme="light"] .btn-primary {
        box-shadow: 0 4px 15px oklch(0.7 0.12 210 / 0.2);

        &:hover {
            box-shadow: 0 8px 25px oklch(0.7 0.12 210 / 0.3);
        }
    }

    [data-theme="dark"] .primary-button {
        box-shadow: 0 0 20px oklch(0.9 0.15 195 / 0.5), 0 0 40px oklch(0.7 0.3 330 / 0.3);

        &:hover {
            box-shadow: 0 0 30px oklch(0.9 0.15 195 / 0.8), 0 0 60px oklch(0.7 0.3 330 / 0.5);
        }
    }

    [data-theme="light"] .primary-button {
        box-shadow: 0 4px 15px oklch(0.7 0.12 210 / 0.3);

        &:hover {
            box-shadow: 0 8px 25px oklch(0.7 0.12 210 / 0.4);
        }
    }
}

/* Responsive */
@media (max-width: 1024px) {
    .course-header {
        grid-template-columns: 1fr;
        gap: 2rem;

        & .course-stats {
            justify-content: center;
        }
    }

    .pool-card {
        grid-template-columns: 1fr;
        gap: 1.5rem;

        & .pool-stats {
            justify-content: center;
        }

        & .btn-primary {
            inline-size: 100%;
            justify-content: center;
        }
    }
}

@media (max-width: 768px) {
    .lessons-grid {
        grid-template-columns: 1fr;
    }

    .course-header .course-stats {
        flex-wrap: wrap;
    }

    .pool-card .pool-stats {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .course-header {
        padding: 1.5rem;

        & .course-title-section h1 {
            font-size: 2rem;
        }

        & .course-title-section > div {
            flex-direction: column !important;
            align-items: flex-start !important;
            gap: 1rem !important;
        }

        & .course-title-section > div > div:last-child {
            width: 100% !important;
            margin-left: 0 !important;
            flex-direction: column !important;
        }

        & .course-title-section button {
            width: 100% !important;
        }

        & .stat-card {
            min-inline-size: 80px;
            padding: 1rem;

            & .stat-value {
                font-size: 2rem;
            }
        }
    }

    .pool-card,
    .lesson-card {
        padding: 1.5rem;
    }

    .pool-card {
        grid-template-columns: 1fr !important;

        & .pool-info {
            flex-direction: column;
            text-align: center;
        }

        & .btn-primary {
            width: 100%;
        }
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 1rem;

        & > div {
            width: 100%;
            flex-direction: column !important;
            gap: 0.75rem;
        }

        & .btn-outline {
            width: 100%;
        }

        & .available-count {
            width: 100%;
            text-align: center;
        }
    }

    .lesson-card {
        & .lesson-content h3 {
            font-size: 1.25rem;
        }
    }
}

/* Pulse glow animation for new badge */
@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 2px 8px oklch(0.45 0.25 260 / 0.4);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 4px 16px oklch(0.45 0.25 260 / 0.6), 0 0 20px oklch(0.55 0.2 270 / 0.4);
        transform: scale(1.05);
    }
}