/* Just A Little Brick - Main Stylesheet */

/* CSS Variables for theming */
:root {
    /* Light mode colors */
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
    
    --nav-bg: #ffffff;
    --nav-border: #dee2e6;
    --nav-link-hover: #f8f9fa;
}

/* Dark mode colors */
[data-theme="dark"] {
    --primary-color: #4dabf7;
    --primary-hover: #339af0;
    --secondary-color: #868e96;
    --success-color: #51cf66;
    --danger-color: #ff6b6b;
    --warning-color: #ffd43b;
    --info-color: #22b8cf;
    
    --bg-primary: #1a1d23;
    --bg-secondary: #25282e;
    --bg-tertiary: #2c2f36;
    
    --text-primary: #e9ecef;
    --text-secondary: #adb5bd;
    --text-muted: #868e96;
    
    --card-bg: #25282e;
    --border-color: #373a40;
    --shadow: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.4);
    
    --nav-bg: #25282e;
    --nav-border: #373a40;
    --nav-link-hover: #2c2f36;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-hover);
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.main-content {
    min-height: calc(100vh - 120px);
    padding-top: 80px; /* Account for fixed nav */
}

/* Top Navigation */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: var(--shadow);
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo a {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
}

.nav-item a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.nav-item a:hover {
    background: var(--nav-link-hover);
}

.nav-item.active a {
    background: var(--primary-color);
    color: white;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.25rem;
}

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

/* Sub Navigation */
.sub-nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    z-index: 999;
}

.sub-nav ul {
    display: flex;
    list-style: none;
    gap: 1rem;
    margin: 0;
    padding: 0;
}

.sub-nav a {
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.sub-nav a:hover {
    background: var(--bg-tertiary);
}

.sub-nav a.active {
    background: var(--primary-color);
    color: white;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-primary {
    border-left: 4px solid var(--primary-color);
}

.card-info {
    border-left: 4px solid var(--info-color);
}

.card-accent {
    border-left: 4px solid var(--warning-color);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
}

thead {
    background: var(--bg-secondary);
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

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

tr:last-child td {
    border-bottom: none;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    opacity: 0.9;
}

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

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="search"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* File Upload */
.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.file-upload:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.file-upload.dragging {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-danger {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-warning {
    background: #fff3cd;
    border: 1px solid #ffeeba;
    color: #856404;
}

.alert-info {
    background: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

[data-theme="dark"] .alert-success {
    background: #1e4620;
    border-color: #28a745;
    color: #d4edda;
}

[data-theme="dark"] .alert-danger {
    background: #4a1c1c;
    border-color: #dc3545;
    color: #f8d7da;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none; /* Mobile menu toggle needed */
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-row {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--bg-secondary);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }