:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --background-color: #F9FAFB;
    --card-background: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --success-color: #059669;
    --warning-color: #D97706;
    --error-color: #DC2626;
    --border-color: #E5E7EB;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 480px;
    background: var(--card-background);
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    padding: 2rem;
    text-align: center;
    color: white;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.header p {
    font-size: 0.875rem;
    opacity: 0.9;
}

.content {
    padding: 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

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

.input-wrapper {
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

input[name="account_no"] {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    transition: all 0.2s;
    color: var(--text-primary);
}

input[name="account_no"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

input[name="account_no"]::placeholder {
    color: var(--text-secondary);
}

.remaining-inputs {
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--background-color);
    border-radius: 0.5rem;
}

.remaining-inputs p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.remaining-inputs p:last-child {
    margin-bottom: 0;
}

.remaining-inputs strong {
    color: var(--primary-color);
    font-weight: 600;
}

button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

button[type="submit"]:hover {
    background: var(--primary-hover);
}

button[type="submit"]:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.message {
    margin-top: 1.5rem;
}

.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.alert i {
    font-size: 1rem;
}

.alert-success {
    background: rgba(5, 150, 105, 0.1);
    color: var(--success-color);
}

.alert-warning {
    background: rgba(217, 119, 6, 0.1);
    color: var(--warning-color);
}

.alert-danger {
    background: rgba(220, 38, 38, 0.1);
    color: var(--error-color);
}

.login-button {
    margin-top: 1rem;
    text-align: center;
}

.login-button a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.login-button a:hover {
    background: var(--primary-hover);
}

@media (max-width: 640px) {
    .container {
        margin: 1rem;
    }

    .header, .content {
        padding: 1.5rem;
    }
}