:root {
    --bg-color: #f3f4f6; /* Soft gray background */
    --card-bg: #ffffff; /* Clean white form */
    --text-main: #111827; /* Very dark gray for readable text */
    --text-muted: #6b7280; /* Medium gray for subtitles/icons */
    --primary: #2563eb; /* Professional solid blue */
    --primary-hover: #1d4ed8; /* Slightly darker blue for hover */
    --border-color: #d1d5db; /* Light gray borders */
    --border-focus: #93c5fd; /* Soft blue ring for focus */

    --error-bg: #fef2f2;
    --error-text: #991b1b;
    --error-border: #f87171;

    --success-bg: #f0fdf4;
    --success-text: #166534;
    --success-border: #4ade80;

    --warning-bg: #fffbeb;
    --warning-text: #92400e;
    --warning-border: #fbbf24;
}

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

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

.login-wrapper {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 40px;
}

/* Header */
.brand-header {
    text-align: center;
    margin-bottom: 30px;
}

.brand-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Alerts */
#error-container {
    margin-bottom: 20px;
}

.alert-box {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 13.5px;
    font-weight: 500;
    margin-bottom: 10px;
    border-left: 4px solid;
}

.alert-box.error {
    background: var(--error-bg);
    color: var(--error-text);
    border-color: var(--error-border);
}

.alert-box.success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: var(--success-border);
}

.alert-box.warning {
    background: var(--warning-bg);
    color: var(--warning-text);
    border-color: var(--warning-border);
}

/* Inputs */
.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    font-size: 14px;
}

.input-wrapper input {
    width: 100%;
    padding: 12px 14px 12px 40px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-main);
    transition: all 0.2s ease;
    background-color: #fff;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--border-focus);
}

.input-wrapper input::placeholder {
    color: #9ca3af;
}

/* Toggle Password Button */
.toggle-password {
    position: absolute;
    right: 14px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    padding: 0;
}

.toggle-password:hover {
    color: var(--text-main);
}

/* Remember Me Checkbox */
.form-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
    cursor: pointer;
}

.checkbox-group label {
    margin-bottom: 0;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
}

/* Submit Button */
.btn-primary {
    width: 100%;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 44px;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Loader */
.loader {
    width: 18px;
    height: 18px;
    border: 2px solid #ffffff;
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    animation: rotation 1s linear infinite;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 30px 20px;
    }
}