:root {
    --primary-color: #0f172a; /* Slate 900 */
    --accent-color: #3b82f6;  /* Blue 500 */
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    color: #f1f5f9;
}

h1, h2, h3, .brand-title {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-weight: 700;
}

.login-container {
    margin-top: 5%;
}

.login-card {
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

.login-header {
    background: rgba(15, 23, 42, 0.4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2.5rem 2rem 1.5rem 2rem;
    text-align: center;
}

.brand-logo {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

.login-body {
    padding: 2.5rem 2rem;
}

.form-control {
    background-color: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f1f5f9;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    transition: all 0.2s ease;
}

.form-control:focus {
    background-color: rgba(15, 23, 42, 0.7);
    border-color: var(--accent-color);
    color: #fff;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.form-control::placeholder {
    color: #94a3b8;
}

.form-label {
    color: #94a3b8;
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.btn-primary {
    background-color: var(--accent-color);
    border: none;
    padding: 0.75rem;
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background-color: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

.footer-text {
    color: #64748b;
    font-size: 0.85rem;
    text-align: center;
    margin-top: 2rem;
}

.alert {
    border-radius: 10px;
    font-size: 0.9rem;
}