/* --- Reset e Variáveis --- */
:root {
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --primary: #0f172a;
    --primary-hover: #1e293b;
    --accent: #3b82f6;
    --text-main: #334155;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --error: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }

body { background-color: var(--bg-color); color: var(--text-main); display: flex; justify-content: center; align-items: center; min-height: 100vh; padding: 20px; }

/* --- Layout do Cartão --- */
.login-wrapper { width: 100%; max-width: 400px; }

.login-card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border);
}

.login-header { text-align: center; margin-bottom: 30px; }
.icon-lock { font-size: 48px; margin-bottom: 10px; }
.login-header h2 { color: var(--primary); font-size: 24px; margin-bottom: 5px; }
.login-header p { color: var(--text-muted); font-size: 14px; }

/* --- Formulário --- */
#login-form { display: flex; flex-direction: column; gap: 20px; }

.input-group { display: flex; flex-direction: column; gap: 8px; }
.input-group label { font-size: 14px; font-weight: 600; color: var(--primary); }
.input-group input {
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    background-color: #f8fafc;
    transition: all 0.3s ease;
}
.input-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); background-color: #fff; }

/* --- Mensagem de Erro --- */
.mensagem-erro { color: var(--error); font-size: 14px; text-align: center; min-height: 20px; display: none; font-weight: 500; }

/* --- Botão --- */
.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
}
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-primary:disabled { background-color: var(--text-muted); cursor: not-allowed; }

/* --- Spinner --- */
.spinner {
    width: 20px; height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }