/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #ffffff;
    --color-text: #1a1a2e;
    --color-primary: #0f3460;
    --color-accent: #e94560;
    --color-muted: #6c757d;
    --color-border: #dee2e6;
    --color-card-bg: #f8f9fa;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

code {
    font-family: var(--font-mono);
    background: var(--color-card-bg);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

/* Header */
.site-header {
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.site-logo:hover {
    text-decoration: none;
}

.site-nav a {
    margin-left: 1.5rem;
    font-size: 0.95rem;
}

/* Main */
.site-main {
    flex: 1;
    padding: 3rem 0;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--color-muted);
    font-size: 0.875rem;
}

/* Hero */
.hero {
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

.lead {
    font-size: 1.2rem;
    color: var(--color-muted);
}

/* Sections */
section {
    margin-bottom: 2.5rem;
}

section h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
    font-family: var(--font-sans);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(15, 52, 96, 0.15);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: opacity 0.15s;
}

.btn:hover {
    opacity: 0.85;
    text-decoration: none;
}

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

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

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.85rem;
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

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

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

/* Auth form */
.auth-form {
    max-width: 400px;
    margin: 2rem auto;
}

.auth-form h1 {
    margin-bottom: 1.5rem;
}

/* Admin */
.admin-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.admin-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1.5rem;
}

.admin-card h2 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}

.stat {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0.25rem 0;
}

.project-list {
    list-style: none;
    margin-top: 0.75rem;
}

.project-list li {
    padding: 0.35rem 0;
    border-bottom: 1px solid var(--color-border);
}

.project-list li:last-child {
    border-bottom: none;
}

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

/* Table */
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table th,
.table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.table th {
    font-weight: 600;
    background: var(--color-bg);
}

/* Responsive */
@media (min-width: 640px) {
    .admin-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 600px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .site-header .container {
        flex-direction: column;
        gap: 0.75rem;
    }

    .site-nav a {
        margin-left: 0;
        margin-right: 1.5rem;
    }
}