:root {
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --brand-primary: #0056b3;
    --brand-secondary: #004494;
    --border-color: #e2e8f0;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    line-height: 1.5;
}

header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--brand-primary);
    letter-spacing: -0.025em;
    transition: opacity 0.2s;
}

.logo a:hover h1 {
    opacity: 0.8;
}

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    margin-left: 2rem;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.container {
    max-width: 1024px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 3rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 800;
    letter-spacing: -0.05em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--brand-primary);
    color: white;
    font-weight: 500;
    border-radius: 6px;
    text-decoration: none;
    transition: background-color 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

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

.btn-outline:hover {
    background-color: #eff6ff;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card:hover {
    /* minimal lift interaction */
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

footer {
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    background-color: #ffffff;
}

/* Forms */
.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

.alert {
    background-color: #fed7d7;
    color: #c53030;
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    border: 1px solid #feb2b2;
}

.terminal-output {
    background: #1a202c;
    color: #48bb78;
    padding: 1rem;
    border-radius: 6px;
    margin-top: 1.5rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
}