:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-body: #ffffff;
    --text-main: #334155;
    --text-muted: #64748b;
    --input-bg: #f8fafc;
    --input-border: #e2e8f0;
}

body.dark-mode {
    --bg-body: #0f172a;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --input-bg: #1e293b;
    --input-border: #334155;
}

body {
    height: 100vh;
    overflow: hidden;
}

.auth-container { height: 100%; }

.auth-left {
    background-size: cover;
    background-position: center;
    position: relative;
}
.auth-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.85), rgba(79, 70, 229, 0.75));
    backdrop-filter: blur(2px);
}

.auth-right {
    background-color: var(--bg-body);
    transition: background-color 0.3s ease;
}

.form-control {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    border-radius: 12px;
    padding: 12px 15px;
    font-size: 0.95rem;
}
.form-control:focus {
    background-color: var(--input-bg);
    color: var(--text-main);
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.form-floating > label { color: var(--text-muted); }

.btn-primary {
    background-color: var(--primary);
    border: none;
    padding: 12px;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

@media (max-width: 991px) {
    .auth-left { display: none; }
    body { overflow-y: auto; }
    .auth-container { height: auto; min-height: 100vh; }
}