:root {
    --primary: #1e293b;
    --secondary: #334155;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --danger: #ef4444;
    --sidebar-width: 280px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* Login Page Specific */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--surface);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 24px;
    color: var(--primary);
    letter-spacing: -0.025em;
}

.login-header p {
    color: var(--text-muted);
    font-size: 14px;
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--primary);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-brand {
    padding: 24px;
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
}

.sidebar-brand span {
    font-weight: 700;
    font-size: 1.25rem;
}

.sidebar-brand small {
    color: var(--text-muted);
}

.sidebar-menu {
    list-style: none;
    padding: 16px 0;
    flex: 1;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    color: #cbd5e1;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
    border-left: 4px solid transparent;
}

.sidebar-menu li a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.sidebar-menu li a.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    border-left-color: var(--accent);
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
}

.top-bar {
    height: 64px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 32px;
}

.user-info {
    font-size: 14px;
    font-weight: 500;
}

.content-wrapper {
    padding: 32px;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* Forms */
.card {
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 32px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
}

input[type="text"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.radio-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.radio-item:hover {
    background: var(--bg);
}

.radio-item input {
    margin-right: 12px;
}

.radio-item.selected {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.05);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-block {
    width: 100%;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.sheet-card {
    background: var(--surface);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s;
}

.sheet-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.sheet-card .status {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.status-completed { color: var(--success); }
.status-pending { color: var(--text-muted); }

/* Utilities */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 14px;
}

.alert-danger {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fee2e2;
}

.alert-success {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid #dcfce7;
}

/* Mobile Menu Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--primary);
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    margin-right: 16px;
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: block;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 15px rgba(0,0,0,0.5);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .top-bar {
        justify-content: flex-start !important;
    }
    
    .top-bar .school-info {
        flex-grow: 1;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }
    
    .sidebar-overlay.show {
        display: block;
    }
}