:root {
    --portal-bg: #081422;
    --portal-surface: rgba(12, 27, 44, 0.82);
    --portal-card: rgba(10, 24, 40, 0.92);
    --portal-text: #eef5ff;
    --portal-muted: #9eb0c5;
    --portal-accent: #18c29c;
    --portal-accent-2: #30a8ff;
    --portal-border: rgba(255, 255, 255, 0.08);
}

body.theme-light {
    --portal-bg: #f4f8fc;
    --portal-surface: rgba(255, 255, 255, 0.92);
    --portal-card: #ffffff;
    --portal-text: #0e2238;
    --portal-muted: #5e7388;
    --portal-accent: #11b38c;
    --portal-accent-2: #227be9;
    --portal-border: rgba(14, 34, 56, 0.1);
}

body {
    background:
        radial-gradient(circle at top right, rgba(48, 168, 255, 0.18), transparent 28%),
        radial-gradient(circle at bottom left, rgba(24, 194, 156, 0.14), transparent 30%),
        linear-gradient(180deg, #07111d 0%, #0a1525 100%);
    color: var(--portal-text);
    min-height: 100vh;
}

.portal-footer {
    background: #07111d;
    border-top: 1px solid rgba(148, 163, 184, .2);
    color: #cbd5e1;
}

.portal-footer a {
    color: #7dd3fc;
    text-decoration: none;
}

.portal-footer a:hover {
    color: #fff;
    text-decoration: underline;
}

body.theme-light {
    background:
        radial-gradient(circle at top right, rgba(34, 123, 233, 0.13), transparent 25%),
        radial-gradient(circle at bottom left, rgba(17, 179, 140, 0.12), transparent 26%),
        linear-gradient(180deg, #edf4fb 0%, #f9fbfd 100%);
}

.portal-navbar {
    background: rgba(5, 12, 21, 0.82);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--portal-border);
}

.portal-navbar .nav-link,
.portal-navbar .navbar-brand {
    color: var(--portal-text);
}

body.theme-light .portal-navbar {
    background: rgba(5, 12, 21, 0.94);
}

body.theme-light .portal-navbar .nav-link,
body.theme-light .portal-navbar .navbar-brand {
    color: #f8fafc;
    font-weight: 600;
}

.hero-section {
    padding-top: 3rem;
}

.portal-panel,
.course-card,
.metric-card {
    background: var(--portal-surface);
    border: 1px solid var(--portal-border);
    border-radius: 24px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.22);
}

.question-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--portal-border);
    border-radius: 20px;
    padding: 1.25rem;
}

.payment-card,
.plan-card,
.lesson-link {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--portal-border);
    border-radius: 16px;
    padding: 1rem;
}

.lesson-link {
    display: block;
    color: var(--portal-text);
    text-decoration: none;
}

.question-card + .question-card {
    margin-top: 1rem;
}

.payment-card + .payment-card,
.lesson-link + .lesson-link {
    margin-top: 1rem;
}

.question-card.is-correct {
    border-color: rgba(25, 135, 84, 0.45);
}

.question-card.is-wrong {
    border-color: rgba(220, 53, 69, 0.45);
}

.answer-option {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--portal-border);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.02);
}

.answer-option:hover {
    border-color: rgba(48, 168, 255, 0.3);
}

.lesson-link.active,
.lesson-link:hover,
.plan-card:hover {
    border-color: rgba(48, 168, 255, 0.35);
}

.course-card__body,
.metric-card,
.community-item {
    padding: 1.25rem;
}

.course-card {
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.course-card:hover {
    transform: translateY(-6px);
    border-color: rgba(48, 168, 255, 0.35);
}

.metric-card {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.metric-card span {
    color: var(--portal-muted);
    font-size: 0.9rem;
}

.metric-card strong {
    font-size: 1.65rem;
}

.metric-card.large {
    min-height: 132px;
    justify-content: center;
}

.portal-badge,
.btn-portal {
    background: linear-gradient(135deg, var(--portal-accent), var(--portal-accent-2));
    border: none;
    color: #04111e;
}

.btn-portal:hover {
    color: #04111e;
    opacity: 0.94;
}

.portal-progress {
    height: 10px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 999px;
}

.portal-progress .progress-bar {
    background: linear-gradient(135deg, var(--portal-accent), var(--portal-accent-2));
}

.community-item + .community-item {
    border-top: 1px solid var(--portal-border);
}

.form-control {
    background: #172536;
    border-color: var(--portal-border);
    color: var(--portal-text);
}

.form-select,
textarea.form-control {
    background: #172536;
    border-color: var(--portal-border);
    color: var(--portal-text);
}

.form-control::placeholder {
    color: #b7c6d8;
    opacity: 1;
}

.form-select option {
    background: #172536;
    color: var(--portal-text);
}

body.theme-light .form-select option {
    background: #ffffff;
    color: #0e2238;
}

body.theme-light .form-control,
body.theme-light .form-select,
body.theme-light textarea.form-control {
    background: #ffffff;
    color: #0e2238;
    border-color: #cbd5e1;
}

body.theme-light .form-control::placeholder {
    color: #64748b;
}

.form-control:focus {
    background: rgba(255, 255, 255, 0.05);
    color: var(--portal-text);
    border-color: rgba(48, 168, 255, 0.55);
    box-shadow: 0 0 0 0.25rem rgba(48, 168, 255, 0.18);
}

.text-secondary,
.text-light-emphasis {
    color: var(--portal-muted) !important;
}

.table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--portal-text);
    --bs-table-border-color: var(--portal-border);
}

.certificate-panel {
    background: linear-gradient(135deg, rgba(255,255,255,0.94), rgba(235,246,255,0.96));
    color: #0e2238;
    border-radius: 28px;
    border: 1px solid rgba(14, 34, 56, 0.08);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.18);
}

.certificate-panel .text-secondary {
    color: #5e7388 !important;
}

@media (max-width: 767px) {
    .hero-section {
        padding-top: 1.5rem;
    }

    .portal-panel,
    .course-card,
    .metric-card,
    .question-card {
        border-radius: 18px;
    }

    .navbar-brand {
        font-size: 1rem;
    }

    .display-4 {
        font-size: 2.2rem;
    }

    .table-responsive {
        font-size: 0.92rem;
    }
}