:root {
    --brand-primary: #5B6FB5;
    --brand-secondary: #4A5A9D;
    --brand-deep: #2b4b80;
    --surface: #ffffff;
    --surface-border: #e5e9f0;
    --text-muted: #6c757d;
    --bg-start: #eef2f8;
    --bg-mid: #dfe6f2;
    --bg-end: #cfd9ea;
}

body {
    background: linear-gradient(160deg, var(--bg-start) 0%, var(--bg-mid) 45%, var(--bg-end) 100%);
    min-height: 100vh;
    padding: 2rem 0;
}

.main-card {
    background: var(--surface);
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.header {
    background: var(--surface);
    color: #000000;
    padding: 2rem;
    text-align: center;
}

.header img {
    max-width: 200px;
    height: auto;
}

.section-card:hover {
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.356);
}

.section-icon {
    font-size: 2rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    border: none;
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(91, 111, 181, 0.4);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(91, 111, 181, 0.4);
}

.form-control:focus,
.form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(91, 111, 181, 0.25);
}

.section-answer {
    background: #f8f9fa;
    border-left: 4px solid var(--brand-primary);
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    min-height: 50px;
    white-space: pre-wrap;
}

.popup {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    background: var(--surface);
    color: var(--brand-primary);
    font-size: 15px;
    font-weight: 500;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    z-index: 9999;
    border: 2px solid var(--brand-primary);
    min-width: 280px;
}

.modal-dialog-lg {
    max-width: 600px;
}

.modal-header {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    color: var(--surface);
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

.advanced-options-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    margin-left: 0.5rem;
}

.range-value {
    display: inline-block;
    min-width: 50px;
    text-align: right;
    font-weight: 600;
    color: var(--brand-primary);
}

.form-range::-webkit-slider-thumb {
    background: var(--brand-primary);
}

.form-range::-moz-range-thumb {
    background: var(--brand-primary);
}

.login-page {
    min-height: 100vh;
    padding: 2rem 1rem;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--surface);
    border-radius: 15px;
    padding: 2.5rem 2.5rem 2rem;
    border: 1px solid var(--surface-border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.login-logo {
    width: 120px;
    height: auto;
}

.login-card a {
    color: var(--brand-deep);
    text-decoration: none;
}

.login-card a:hover {
    text-decoration: underline;
}

.password-toggle {
    border: 1px solid var(--surface-border);
}

.password-input::-ms-reveal,
.password-input::-ms-clear {
    display: none;
}

#query-input {
    resize: none;
}