:root, .theme-default {
    color-scheme: dark;
    --bg-main: #0f172a;
    /* Slate 900 */
    --bg-card: #1e293b;
    /* Slate 800 */
    --bg-card-hover: #334155;
    /* Slate 700 */
    --text-primary: #f8fafc;
    /* Slate 50 */
    --text-secondary: #94a3b8;
    /* Slate 400 */
    --accent-primary: #3b82f6;
    /* Blue 500 */
    --accent-hover: #2563eb;
    /* Blue 600 */
    --border-color: #334155;
    /* Slate 700 */
    --danger: #ef4444;
}

.theme-light {
    color-scheme: light;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent-primary: #2563eb;
    --accent-hover: #1d4ed8;
    --border-color: #e2e8f0;
    --danger: #dc2626;
}

.theme-dracula {
    color-scheme: dark;
    --bg-main: #282a36;
    --bg-card: #44475a;
    --bg-card-hover: #6272a4;
    --text-primary: #f8f8f2;
    --text-secondary: #6272a4;
    --accent-primary: #bd93f9;
    --accent-hover: #ff79c6;
    --border-color: #44475a;
    --danger: #ff5555;
}

.theme-oled {
    color-scheme: dark;
    --bg-main: #000000;
    --bg-card: #111111;
    --bg-card-hover: #222222;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --accent-primary: #6366f1;
    --accent-hover: #818cf8;
    --border-color: #333333;
    --danger: #ef4444;
}

.theme-gruvbox {
    color-scheme: dark;
    --bg-main: #282828;
    --bg-card: #3c3836;
    --bg-card-hover: #504945;
    --text-primary: #ebdbb2;
    --text-secondary: #a89984;
    --accent-primary: #d3869b;
    --accent-hover: #b16286;
    --border-color: #504945;
    --danger: #cc241d;
}

:root {

    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--accent-primary);
}

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

.file-status {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-card-hover);
    border-color: #475569;
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.btn-danger:hover {
    background-color: var(--danger);
    color: white;
}

/* Controls (Search & Filter) */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1rem;
}

.search-bar {
    flex: 1;
    position: relative;
    max-width: 400px;
}

.search-bar i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-bar input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.filters select {
    padding: 0.75rem 2.5rem 0.75rem 1rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.875rem;
    appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1rem;
}

.filters select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

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

/* Resource Card */
.resource-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    opacity: 0;
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: #475569;
}

.resource-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.card-badges {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-programming {
    background-color: rgba(59, 130, 246, 0.1);
    color: #60a5fa;
}

.badge-design {
    background-color: rgba(236, 72, 153, 0.1);
    color: #f472b6;
}

.badge-business {
    background-color: rgba(16, 185, 129, 0.1);
    color: #34d399;
}

.badge-science {
    background-color: rgba(139, 92, 246, 0.1);
    color: #a78bfa;
}

.badge-other {
    background-color: rgba(148, 163, 184, 0.1);
    color: #94a3b8;
}

.badge-type {
    background-color: rgba(245, 158, 11, 0.1);
    color: #fbbf24;
}

.badge-status-not-started {
    background-color: rgba(148, 163, 184, 0.1);
    color: #94a3b8;
}

.badge-status-in-progress {
    background-color: rgba(59, 130, 246, 0.1);
    color: #60a5fa;
}

.badge-status-completed {
    background-color: rgba(16, 185, 129, 0.1);
    color: #34d399;
}

.badge-status-on-hold {
    background-color: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.badge-status-discontinued {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.card-dates {
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.text-danger {
    color: #ef4444;
}

.text-warning {
    color: #f59e0b;
}

.text-primary {
    color: var(--accent-primary);
}

.text-green {
    color: #10b981;
}

.text-secondary {
    color: var(--text-secondary);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    font-size: 0.75rem;
    color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-weight: 500;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Elegant Expand Area */
.card-content-top {
    display: flex;
    flex-direction: column;
}

.card-expand-area {
    margin-top: auto;
    display: flex;
    justify-content: center;
    border-top: 1px dashed var(--border-color);
    padding-top: 0.75rem;
    margin-top: 1rem;
}

.expand-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.expand-btn:hover,
.expand-btn.active {
    color: var(--accent-primary);
}

.icon-transition {
    transition: transform 0.3s ease;
}

.card-details {
    padding-top: 1rem;
    border-top: 1px dashed var(--border-color);
    margin-top: 1rem;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.card-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.card-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

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

.action-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
}

.action-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
}

.delete-btn:hover {
    color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

.edit-btn:hover {
    color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.1);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 50;
}

.modal.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--text-primary);
}

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

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

input[type="text"],
input[type="url"],
input[type="date"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: var(--transition);
}

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

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

/* Hide number input arrows */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

.amount-input {
    font-size: 1.5rem !important;
    font-weight: 700;
    color: var(--accent-primary) !important;
    padding: 1rem !important;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border-color);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.course-progress {
    margin: 1rem 0;
    background: rgba(15, 23, 42, 0.3);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.progress-value {
    color: var(--accent-primary);
    font-weight: 600;
}

.progress-bar-bg {
    height: 8px;
    background: var(--bg-main);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), #8b5cf6);
    transition: width 0.3s ease;
}

.progress-controls {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.btn-icon {
    background: var(--bg-card-hover);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.7rem;
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .search-bar {
        max-width: 100%;
    }

    .top-nav {
        flex-direction: column;
        gap: 1.5rem;
    }

    .actions {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .modal-content {
        padding: 1.5rem;
        width: 95%;
        margin: auto;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }
}