@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');
@import url('https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css');

:root {
    --primary: #1a365d;
    --primary-light: #2d4a7c;
    --secondary: #ffffff;
    --accent: #f6ad55;
    --accent-light: #fbd38d;
    --background: #ffffff;
    --background-alt: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --blue: #3b82f6;
    --yellow: #eab308;
    --success: #10b981;
    --danger: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
}

.nav-container {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--secondary);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--yellow);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    color: var(--blue);
}

.nav-buttons {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    padding: 0.625rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover {
    background: var(--background-alt);
    color: var(--primary);
}

.nav-btn.active {
    background: var(--primary);
    color: var(--secondary);
}

.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 80px);
}

.hero-title {
    text-align: center;
    margin-bottom: 2.5rem;
    padding: 2rem 0;
}

.hero-title h1 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.75rem;
}

.hero-title p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.subject-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: var(--blue);
    opacity: 0.4;
    transform: scale(0);
    animation: ripple-effect 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-effect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.subject-card.clicked {
    background: var(--blue) !important;
    border-color: var(--blue) !important;
    transform: scale(0.98);
    transition: all 0.3s ease;
}

.subject-card.clicked .subject-icon,
.subject-card.clicked .subject-icon i {
    background: rgba(255,255,255,0.2);
    color: #fff !important;
}

.subject-card.clicked .subject-name {
    color: #fff !important;
}

.subject-card.clicked .subject-desc {
    color: rgba(255,255,255,0.8) !important;
}

.subject-card.clicked .subject-arrow {
    color: #fff !important;
}

.subject-card:hover {
    border-color: var(--blue);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.subject-icon i {
    font-size: 1.5rem;
}

.subject-info {
    flex: 1;
}

.subject-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.subject-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

.subject-arrow {
    color: var(--text-secondary);
    font-size: 1.25rem;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary);
}

.credit-container {
    max-width: 600px;
    margin: 2rem auto;
}

.credit-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2.5rem;
    text-align: center;
}

.credit-avatar {
    width: 100px;
    height: 100px;
    background: var(--background-alt);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2.5rem;
    color: var(--blue);
}

.credit-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.credit-message {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.akun-container {
    max-width: 440px;
    margin: 2rem auto;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
}

.login-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--blue);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.login-btn {
    width: 100%;
    padding: 0.875rem;
    background: var(--primary);
    border: none;
    border-radius: 8px;
    color: var(--secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
}

.login-btn:hover {
    background: var(--primary-light);
}

.user-info {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
}

.user-avatar {
    width: 80px;
    height: 80px;
    background: var(--background-alt);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2rem;
    color: var(--blue);
}

.user-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
}

.user-role {
    color: var(--blue);
    font-weight: 500;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.logout-btn {
    padding: 0.625rem 1.5rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.logout-btn:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.materials-container {
    max-width: 900px;
    margin: 0 auto;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: var(--background-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    margin-bottom: 1.5rem;
}

.back-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

.subject-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.subject-header-icon i {
    font-size: 2rem;
}

.subject-header-icon {
    width: 72px;
    height: 72px;
    background: var(--background-alt);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: var(--blue);
}

.subject-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.subject-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.materials-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.material-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.material-item .ripple {
    position: absolute;
    border-radius: 50%;
    background: var(--blue);
    opacity: 0.4;
    transform: scale(0);
    animation: ripple-effect 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-effect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

.material-item.clicked {
    background: var(--blue) !important;
    border-color: var(--blue) !important;
    transform: scale(0.98);
    transition: all 0.3s ease;
}

.material-item.clicked .material-number {
    background: rgba(255,255,255,0.25);
    color: #fff;
}

.material-item.clicked .material-title {
    color: #fff !important;
}

.material-item.clicked .material-status {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.3);
    color: #fff;
}

.material-item.clicked .material-status.unlocked {
    color: #fff;
}

.material-item.clicked .material-content-inner {
    background: rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.9);
}

.material-item:hover {
    border-color: var(--blue);
}

.material-item.expanded {
    flex-direction: column;
    align-items: flex-start;
}

.material-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.material-number {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--secondary);
    font-size: 0.9rem;
}

.material-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
}

.material-status {
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
}

.material-status.locked {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.material-status.unlocked {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.material-content {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    width: 100%;
}

.material-item.expanded .material-content {
    display: block;
}

.material-content-inner {
    background: var(--background-alt);
    border-radius: 8px;
    padding: 1.25rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    white-space: pre-wrap;
}

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.modal-message {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.modal-btn {
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    border: none;
    border-radius: 8px;
    color: var(--secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease;
}

.modal-btn:hover {
    background: var(--primary-light);
}

.admin-container {
    max-width: 1200px;
    margin: 0 auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.admin-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.admin-btn {
    padding: 0.625rem 1.25rem;
    background: var(--blue);
    border: none;
    border-radius: 8px;
    color: var(--secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    text-decoration: none;
}

.admin-btn:hover {
    background: #2563eb;
}

.admin-btn.secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.admin-btn.secondary:hover {
    background: var(--background-alt);
    color: var(--text-primary);
}

.admin-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

.tab-btn {
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background: var(--background-alt);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--primary);
    color: var(--secondary);
    border-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.admin-section {
    margin-bottom: 2.5rem;
}

.admin-form-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.admin-form-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.admin-form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.admin-form-grid textarea {
    grid-column: 1 / -1;
}

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table-responsive table {
    min-width: 600px;
}

.admin-table {
    width: 100%;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.admin-table th,
.admin-table td {
    padding: 0.875rem 1rem;
    text-align: left;
}

.admin-table th {
    background: var(--background-alt);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    border-bottom: 1px solid var(--border);
}

.admin-table td {
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table tr:hover td {
    background: var(--background-alt);
}

.action-btns {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    padding: 0.375rem 0.75rem;
    border: none;
    border-radius: 6px;
    font-family: 'Outfit', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.action-btn.edit {
    background: #eff6ff;
    color: var(--blue);
}

.action-btn.edit:hover {
    background: #dbeafe;
}

.action-btn.delete {
    background: #fef2f2;
    color: var(--danger);
}

.action-btn.delete:hover {
    background: #fee2e2;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.notification {
    position: fixed;
    top: 90px;
    right: 20px;
    padding: 1rem 1.25rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-weight: 500;
    z-index: 3000;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.notification.success {
    border-color: var(--success);
    color: var(--success);
}

.notification.error {
    border-color: var(--danger);
    color: var(--danger);
}

@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-buttons {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
    
    .nav-text {
        display: none;
    }
    
    .main-content {
        padding: 1.5rem 1rem;
    }
    
    .hero-title h1 {
        font-size: 1.75rem;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .admin-title {
        font-size: 1.5rem;
    }
    
    .btn-text {
        display: none;
    }
    
    .admin-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
        justify-content: center;
    }
    
    .admin-form-grid {
        grid-template-columns: 1fr;
    }
    
    .admin-table {
        font-size: 0.8rem;
    }
    
    .admin-table th,
    .admin-table td {
        padding: 0.5rem;
    }
    
    .action-btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
    
    .form-input {
        font-size: 0.9rem;
    }
    
    .login-card,
    .credit-card,
    .user-info,
    .admin-form-card {
        padding: 1.25rem;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .subject-header h1 {
        font-size: 1.5rem;
    }
    
    .material-main {
        flex-wrap: wrap;
    }
    
    .material-title {
        flex: none;
        width: calc(100% - 60px);
    }
    
    .material-status {
        width: 100%;
        margin-top: 0.5rem;
    }
}