:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --bg-dark: #0F172A;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-main: #F8FAFC;
    --text-dim: #94A3B8;
    --accent-color: #06B6D4;
    --success: #10B981;
    --danger: #EF4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow: hidden;
    height: 100vh;
}

/* Screens */
.screen {
    display: none;
    height: 100vh;
}

.screen.active {
    display: flex;
}

/* Login Card */
#login-screen, #register-screen {
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at top right, #1e1b4b, #0f172a);
}

.login-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 24px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.05);
    padding: 10px;
    border-radius: 20px;
}

h1 {
    font-size: 24px;
    margin-bottom: 8px;
}

p {
    color: var(--text-dim);
    margin-bottom: 30px;
    font-size: 14px;
}

.input-group {
    margin-bottom: 16dp;
    text-align: left;
}

input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: white;
    font-size: 15px;
    transition: all 0.3s;
    margin-bottom: 15px;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.primary-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

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

.primary-btn.small {
    width: auto;
    padding: 8px 16px;
    font-size: 13px;
}

.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.login-footer {
    margin-top: 24px;
    font-size: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.login-footer span {
    color: var(--text-dim);
}

.login-footer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.login-footer a:hover {
    text-decoration: underline;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: rgba(15, 23, 42, 0.8);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
}

.sidebar-logo {
    width: 40px;
    height: 40px;
}

.sidebar-header span {
    font-weight: 700;
    font-size: 18px;
}

.sidebar-nav {
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-dim);
    text-decoration: none;
    border-radius: 12px;
    margin-bottom: 4px;
    transition: all 0.2s;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.nav-item.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary-color);
    font-weight: 600;
}

.sidebar-footer {
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-info small {
    color: var(--text-dim);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 18px;
    padding: 8px;
    border-radius: 8px;
}

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

/* Content Area */
.content {
    flex: 1;
    overflow-y: auto;
    padding: 40px;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 20px;
}

.stat-label {
    display: block;
    color: var(--text-dim);
    font-size: 14px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-color);
}

/* Tables */
.table-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 16px 24px;
    text-align: left;
}

th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-dim);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

tr:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

/* Content Cards */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.content-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.content-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.card-img {
    width: 100%;
    height: 160px;
    background-size: cover;
    background-position: center;
    background-color: rgba(255,255,255,0.05);
}

.card-body {
    padding: 20px;
}

.card-tag {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-color);
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.card-body h4 {
    font-size: 16px;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

.icon-btn.edit:hover { color: var(--accent-color); background: rgba(6, 182, 212, 0.1); }
.icon-btn.delete:hover { color: var(--danger); background: rgba(239, 68, 68, 0.1); }


/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active { display: flex; }

.modal-content {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 24px;
    width: 90%;
    max-width: 500px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

.secondary-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: white;
    border-radius: 12px;
    cursor: pointer;
}