:root {
    /* Color Palette (iOS Inspired) */
    --primary: #1ca35b;
    --primary-hover: #158a4b;
    --primary-light: rgba(28, 163, 91, 0.1);
    
    --secondary: #34c759;
    --danger: #ff3b30;
    --warning: #ffcc00;
    --info: #007aff;

    /* Light Theme Core Colors */
    --bg-base: #f2f2f7;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f9f9f9;
    
    /* Text Colors */
    --text-primary: #1c1c1e;
    --text-secondary: #3a3a3c;
    --text-muted: #8e8e93;
    
    /* Borders & UI Elements */
    --border-color: rgba(60, 60, 67, 0.12);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(0, 0, 0, 0.05);
    
    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 15px rgba(28, 163, 91, 0.2);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-base);
    background-image: radial-gradient(rgba(15, 92, 83, 0.04) 1.5px, transparent 1.5px);
    background-size: 24px 24px;
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Glassmorphism Utilities */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.nav-links {
    list-style: none;
    padding: 16px 12px;
    flex-grow: 1;
}

.nav-item {
    margin-bottom: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 10px;
    transition: var(--transition-fast);
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary);
}

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    height: 70px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
}

.content-wrapper {
    padding: 24px;
    flex-grow: 1;
    overflow-y: auto;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background-color: #ffffff;
    border: 1px solid #d1d1d6;
    border-radius: 10px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Select element styling */
select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%238e8e93'%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 12px center;
    background-size: 16px;
    padding-right: 40px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 200ms ease;
    border: none;
    font-size: 0.95rem;
    text-decoration: none !important;
}

.btn-primary {
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    border: 1px solid #148045;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.3), 0 2px 4px rgba(0, 0, 0, 0.1);
    text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-1px);
    background: linear-gradient(180deg, #1ea95f 0%, #179351 100%);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.4), 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn-primary:active {
    transform: translateY(1px);
    background: var(--primary-hover);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: linear-gradient(180deg, #ffffff 0%, #e5e5ea 100%);
    color: var(--text-primary);
    border: 1px solid #d1d1d6;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 1), 0 2px 4px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
    background: linear-gradient(180deg, #ffffff 0%, #d1d1d6 100%);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 1), 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-secondary:active {
    transform: translateY(1px);
    background: #e5e5ea;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Cards */
.card {
    background: var(--bg-surface);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

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

.table th, .table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background-color: var(--bg-base);
}

/* Badges */
.badge {
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background: rgba(52, 199, 89, 0.15); color: #28a745; }
.badge-warning { background: rgba(255, 204, 0, 0.2); color: #d97706; }
.badge-danger { background: rgba(255, 59, 48, 0.15); color: #dc3545; }
.badge-info { background: rgba(0, 122, 255, 0.15); color: #007aff; }

/* Dashboard Grid */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    overflow: hidden;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -1px;
    white-space: nowrap;
    width: 100%;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Auth Page Layout */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-base);
    padding: 20px;
}

.auth-card {
    width: 100%;
    max-width: 440px;
    padding: 40px;
    background: var(--bg-surface);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.auth-card h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* Utilities */
.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.d-flex { display: flex; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

@media (max-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .auth-card, .glass-panel {
        padding: 24px !important;
    }
    
    .register-container {
        margin: 20px auto;
    }
}

/* Alerts */
.alert {
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    font-weight: 500;
}
.alert-error {
    background-color: rgba(255, 59, 48, 0.1);
    border: 1px solid rgba(255, 59, 48, 0.2);
    color: #d32f2f;
}
.alert-success {
    background-color: rgba(52, 199, 89, 0.1);
    border: 1px solid rgba(52, 199, 89, 0.2);
    color: #2e7d32;
}