@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    /* Tailscale inspired color palette */
    --bg-color: #f9fafb; /* Very light grey */
    --text-primary: #111827; /* Near black */
    --text-secondary: #4b5563; /* Grey */
    --text-muted: #9ca3af;
    
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    
    --btn-primary-bg: #111827;
    --btn-primary-text: #ffffff;
    --btn-primary-hover: #374151;
    
    --btn-secondary-bg: #ffffff;
    --btn-secondary-border: #d1d5db;
    --btn-secondary-text: #374151;
    --btn-secondary-hover: #f3f4f6;

    --btn-danger-bg: #ef4444;
    --btn-danger-hover: #dc2626;
    --btn-danger-text: #ffffff;

    --btn-success-bg: #10b981;
    --btn-success-hover: #059669;
    --btn-success-text: #ffffff;

    --nav-bg: #ffffff;
    --nav-border: #e5e7eb;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    
    --radius-md: 6px;
    --radius-lg: 8px;
    
    --focus-ring: 0 0 0 2px #ffffff, 0 0 0 4px #3b82f6;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    color: var(--text-primary);
    font-weight: 600;
}

/* --- Navbar --- */
.navbar {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar .logo {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease-in-out;
    border: 1px solid transparent;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

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

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

.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border-color: var(--btn-secondary-border);
}

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

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

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

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

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

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

/* --- Inputs --- */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    font-size: 0.875rem;
    font-family: inherit;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--card-bg);
    color: var(--text-primary);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

/* --- Layout Containers --- */
.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 40px 24px;
    flex: 1;
}

.text-center {
    text-align: center;
}

.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }