:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --surface: rgba(255, 255, 255, 0.95);
    --surface-border: rgba(255, 255, 255, 0.2);
    --text-main: #1F2937;
    --text-muted: #6B7280;
    --bg-gradient-1: #2c3e50;
    --bg-gradient-2: #34495e;
}

body,
html {
    height: 100%;
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
    overflow: hidden;
    color: var(--text-main);
}

.login-wrapper {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--surface-border);
    border-radius: 24px;
    padding: 40px 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    z-index: 10;
}

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

.login-header h2 {
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--text-main);
    letter-spacing: -0.025em;
}

.form-floating .form-control {
    border: 1px solid #E5E7EB;
    border-radius: 12px;
    background-color: #fff;
    transition: all 0.2s ease;
}

.form-floating .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

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

.btn-login {
    background: var(--primary);
    border: none;
    border-radius: 12px;
    padding: 14px;
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: 0.025em;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(79, 70, 229, 0.2);
    color: white;
}

.btn-login:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(79, 70, 229, 0.3);
    color: white;
}

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

.alert-danger {
    background-color: #FEF2F2;
    border-color: #FEE2E2;
    color: #991B1B;
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
}

/* Error Transition */
.error-wrapper {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.4s cubic-bezier(0.4, 0, 0.2, 1), margin 0.3s ease;
    overflow: hidden;
    visibility: hidden;
    pointer-events: none;
    margin-bottom: 0;
}

.error-wrapper.show {
    grid-template-rows: 1fr;
    visibility: visible;
    pointer-events: auto;
    margin-bottom: 1.5rem;
}

.error-wrapper > div {
    min-height: 0;
}