:root {
    --bg-primary: #0a0f14;
    --bg-secondary: #0f151a;
    --bg-card: rgba(18, 24, 32, 0.9);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent: #00c853;
    --accent-light: #00e676;
    --accent-glow: rgba(0, 200, 83, 0.3);
    --danger: #ff5252;
    --warning: #ffc107;
    --success: #00c853;
    --radius: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

/* App Layout */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
}

.header-title {
    font-size: 1.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-title i {
    color: var(--accent);
}

.header-actions {
    display: flex;
    gap: 10px;
}

/* Main Content */
.main {
    flex: 1;
    padding: 20px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Search & Filters */
.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 12px 16px;
    padding-left: 45px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
}

.search-wrapper {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-wrapper i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.filter-select {
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    color: #000;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

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

.btn-icon {
    width: 45px;
    height: 45px;
    padding: 0;
    border-radius: var(--radius);
}

/* Stats Cards */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: #000;
}

.stat-info h3 {
    font-size: 1.8rem;
    font-weight: 700;
}

.stat-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Inventory Grid */
.inventory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}

/* Item Card */
.item-card {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.item-card:hover {
    border-color: rgba(0, 200, 83, 0.3);
    transform: translateY(-3px);
}

.item-card.low-stock {
    border-color: rgba(255, 193, 7, 0.5);
}

.item-card.low-stock::before {
    content: '⚠️ Niska količina';
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 0.7rem;
    background: var(--warning);
    color: #000;
    padding: 4px 8px;
    border-radius: 20px;
    font-weight: 600;
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.item-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.item-category {
    font-size: 0.8rem;
    color: var(--accent);
    background: rgba(0, 200, 83, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
    display: inline-block;
}

.item-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 15px;
}

.item-detail {
    background: rgba(255, 255, 255, 0.03);
    padding: 10px;
    border-radius: 8px;
}

.item-detail-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 3px;
}

.item-detail-value {
    font-size: 1.1rem;
    font-weight: 600;
}

.item-actions {
    display: flex;
    gap: 8px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.item-actions .btn {
    flex: 1;
    padding: 10px;
    font-size: 0.85rem;
}

/* 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;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

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

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* Form */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 2000;
}

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

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

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

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 12px 15px;
    }

    .main {
        padding: 15px;
    }

    .stats {
        grid-template-columns: 1fr 1fr;
    }

    .inventory-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .header-title span {
        display: none;
    }
}

/* TV / Ultrawide */
@media (min-width: 1600px) {
    .main {
        max-width: 1600px;
    }

    html {
        font-size: 18px;
    }
}

@media (min-width: 2000px) {
    .main {
        max-width: 1900px;
    }

    html {
        font-size: 20px;
    }

    .inventory-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
}

/* PWA safe areas */
@supports (padding: max(0px)) {
    .header {
        padding-top: max(15px, env(safe-area-inset-top));
    }
}