/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

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

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

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

.btn-success:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

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

.btn-danger:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

/* ========== Cards ========== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--border-light);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.05rem;
    color: var(--text-primary);
}

.card-body {
    padding: var(--spacing-lg);
}

/* ========== Stat Cards ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-light);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    background: var(--color-primary);
    color: white;
    flex-shrink: 0;
}

.stat-icon.accent { background: var(--color-accent); }
.stat-icon.success { background: var(--color-success); }
.stat-icon.warning { background: var(--color-warning); }
.stat-icon.danger { background: var(--color-danger); }

.stat-info h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-detail {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ========== Forms ========== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

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

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* ========== Progress Bar ========== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    width: 0%;
    transition: width 0.4s ease;
    border-radius: var(--radius-full);
}

/* ========== Tables ========== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.data-table th,
.data-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
    position: sticky;
    top: 0;
}

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

.data-table tr:hover td {
    background: var(--bg-hover);
}

/* ========== Tags / Badges ========== */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.tag-primary {
    background: rgba(102, 126, 234, 0.15);
    color: var(--color-primary-light);
}

.tag-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

.tag-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-warning);
}

.tag-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-danger);
}

/* ========== Section Header ========== */
.section-header {
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ========== Notification Toast ========== */
.notification {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    max-width: 420px;
    pointer-events: auto;
    transform: translateX(120%);
    transition: transform var(--transition-normal);
    font-size: 0.9rem;
}

.notification.show {
    transform: translateX(0);
}

.notification.success { border-left: 4px solid var(--color-success); }
.notification.warning { border-left: 4px solid var(--color-warning); }
.notification.error { border-left: 4px solid var(--color-danger); }
.notification.info { border-left: 4px solid var(--color-info); }

.notification i {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.notification.success i { color: var(--color-success); }
.notification.warning i { color: var(--color-warning); }
.notification.error i { color: var(--color-danger); }
.notification.info i { color: var(--color-info); }

.notification .notif-message {
    flex: 1;
    color: var(--text-primary);
}

.notification .notif-close {
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    transition: color var(--transition-fast);
}

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

/* ========== Upload Area (shared) ========== */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.upload-area:hover {
    border-color: var(--color-primary);
    background: rgba(102, 126, 234, 0.05);
}

.upload-area.dragover {
    border-color: var(--color-primary);
    background: rgba(102, 126, 234, 0.1);
}

.upload-area i {
    font-size: 2.5rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

/* ========== Grid Helpers ========== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}