/* ===== CSS Variables & Theme ===== */
:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-card: #252525;
    --bg-hover: #333333;
    --text-primary: #e8e8e8;
    --text-secondary: #888888;
    --accent-primary: #dc3545;
    --accent-secondary: #8b0000;
    --accent-success: #28a745;
    --border-color: #3a3a3a;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
    --shadow-hover: 0 8px 30px rgba(220, 53, 69, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Header ===== */
.header {
    background: rgba(25, 25, 25, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-stats {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.stat-item span {
    color: var(--accent-success);
    font-weight: 600;
}

/* ===== Main Layout ===== */
.main-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    height: calc(100vh - 70px);
}

/* ===== Panel Base ===== */
.panel {
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.panel-title {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

.panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

/* ===== Search Bar ===== */
.search-container {
    display: flex;
    gap: 0.75rem;
    flex: 1;
    max-width: 500px;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.2);
}

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

/* ===== Buttons ===== */
.btn {
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-success {
    background: linear-gradient(135deg, #28a745, #218838);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #d63031, #e17055);
    color: white;
}

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

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ===== Button Group ===== */
.btn-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* ===== Card Grid ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

/* ===== Card Item ===== */
.card-item {
    position: relative;
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-card);
    border: 2px solid transparent;
}

.card-item:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-hover);
}

.card-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-sm);
}

.card-count {
    position: absolute;
    bottom: 5px;
    right: 5px;
    background: var(--accent-primary);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 700;
}

.card-controls {
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    display: flex;
    justify-content: space-between;
    opacity: 0;
    transition: var(--transition);
}

.card-item:hover .card-controls {
    opacity: 1;
}

.card-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.card-btn.plus {
    background: var(--accent-success);
    color: var(--bg-primary);
}

.card-btn:hover {
    transform: scale(1.15);
}

/* ===== Filter Checkboxes ===== */
.filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.filter-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    transform: translateY(-20px);
    transition: var(--transition);
}

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

.modal-header {
    padding: 1.25rem 1.5rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--accent-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    resize: vertical;
}

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

.modal-footer {
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* ===== Loading Spinner ===== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===== Empty State ===== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--text-secondary);
    text-align: center;
}

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

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    box-shadow: var(--shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1001;
}

.toast.active {
    transform: translateY(0);
    opacity: 1;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
        height: auto;
    }

    .panel {
        min-height: 50vh;
    }

    .header {
        flex-direction: column;
        gap: 1rem;
    }

    .header-stats {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 600px) {
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 0.5rem;
    }

    .btn-group {
        width: 100%;
        justify-content: center;
    }

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