@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --color-primary: #5863F8;
    --color-primary-light: #7C85FA;
    --color-primary-dark: #4149D4;
    --color-bg-dark: #0f172a;
    --color-bg-card: #1e293b;
    --color-bg-card-hover: #253348;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-heading: #f8fafc;
    --color-border: #334155;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-danger: #f87171;
}

* {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-dark);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    flex: 1;
}

.navbar {
    padding: 1rem 0;
    background: transparent !important;
    border-bottom: 1px solid var(--color-border) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.navbar-brand {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-heading) !important;
}

.navbar-brand .brand-icon {
    color: var(--color-primary);
}

.nav-link {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text-muted) !important;
    transition: color 0.2s ease;
    padding: 0.5rem 1rem !important;
}

.nav-link:hover {
    color: var(--color-text-heading) !important;
}

.btn-primary-custom {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary-custom:hover {
    background: var(--color-primary-light);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(88, 99, 248, 0.3);
}

.btn-outline-custom {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-outline-custom:hover {
    border-color: var(--color-text-muted);
    color: var(--color-text-heading);
    background: rgba(255,255,255,0.03);
}

.hero-section {
    padding: 3rem 0 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(88, 99, 248, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--color-text-heading);
    margin-bottom: 1.5rem;
}

.hero-title .accent {
    color: var(--color-primary);
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.7;
    font-weight: 400;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.hero-note {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.section-dark {
    background: #111827;
    padding: 5rem 0;
}

.section-light {
    background: var(--color-bg-dark);
    padding: 5rem 0;
}

.section-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-text-heading);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 640px;
    line-height: 1.7;
}

.feature-card {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
}

.feature-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 8px;
    background: rgba(88, 99, 248, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--color-primary-light);
    font-size: 1.25rem;
}

.feature-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 0.75rem;
}

.feature-description {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.math-card {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    transition: border-color 0.2s;
}

.math-card:hover {
    border-color: rgba(88, 99, 248, 0.25);
}

.math-card-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 8px;
    background: rgba(88, 99, 248, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    color: var(--color-primary-light);
    font-size: 1.15rem;
}

.math-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.math-card-text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.math-card-text strong {
    color: var(--color-primary-light);
    font-weight: 600;
}

.math-card-list {
    list-style: none;
    padding: 0;
    margin: 0.75rem 0;
}

.math-card-list li {
    padding: 0.35rem 0;
    padding-left: 1.25rem;
    position: relative;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.math-card-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
}

.math-card-list li strong {
    color: var(--color-text);
    font-weight: 600;
}

.use-case-tag {
    background: rgba(88, 99, 248, 0.1);
    border: 1px solid rgba(88, 99, 248, 0.2);
    border-radius: 8px;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary-light);
    text-align: center;
}

.showcase-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    overflow: hidden;
}

.showcase-card:hover {
    border-color: rgba(88, 99, 248, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.showcase-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.showcase-img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

.pricing-section {
    background: var(--color-bg-dark);
    padding: 5rem 0;
}

.pricing-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2.5rem;
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.pricing-card .plan-badge {
    background: rgba(88, 99, 248, 0.15);
    color: var(--color-primary-light);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.pricing-card .price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-text-heading);
    letter-spacing: -0.03em;
}

.pricing-card .price-period {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-muted);
}

.pricing-card .feature-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.pricing-card .feature-list li {
    padding: 0.5rem 0;
    color: var(--color-text);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.pricing-card .feature-list li .check {
    color: var(--color-primary-light);
    font-size: 1rem;
    flex-shrink: 0;
}

.card-custom {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: border-color 0.2s;
}

.card-custom:hover {
    border-color: rgba(88, 99, 248, 0.3);
}

.card-custom .card-body {
    padding: 1.75rem;
}

.disclaimer-bar {
    background: rgba(88, 99, 248, 0.08);
    border: 1px solid rgba(88, 99, 248, 0.2);
    border-radius: 10px;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
}

.disclaimer-bar p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin: 0;
}

.form-control {
    background: var(--color-bg-dark) !important;
    border: 1px solid var(--color-border) !important;
    color: var(--color-text) !important;
    border-radius: 8px;
    padding: 0.65rem 1rem;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 3px rgba(88, 99, 248, 0.15) !important;
}

.form-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text);
    margin-bottom: 0.4rem;
}

.form-text {
    color: var(--color-text-muted) !important;
    font-size: 0.8rem;
}

.form-check-input:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.auth-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2.5rem;
}

.auth-card h3 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-heading);
}

.auth-card .auth-subtitle {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

footer {
    background: #0b1120 !important;
    border-top: 1px solid var(--color-border) !important;
    padding: 2rem 0;
}

footer p, footer a {
    color: var(--color-text-muted) !important;
    font-size: 0.85rem;
}

footer a:hover {
    color: var(--color-text-heading) !important;
}

.badge-plan {
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.8rem;
}

.badge-pro {
    background: rgba(88, 99, 248, 0.15);
    color: var(--color-primary-light);
}

.badge-free {
    background: rgba(148, 163, 184, 0.15);
    color: var(--color-text-muted);
}

.status-active {
    color: var(--color-success);
}

.status-trialing {
    color: var(--color-warning);
}

.status-danger {
    color: var(--color-danger);
}

.streamlit-frame {
    width: 100%;
    border: none;
    border-radius: 12px;
    background: #0e1117;
}

.upgrade-overlay {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 3rem;
    text-align: center;
}

.table-dark {
    --bs-table-bg: transparent;
}

.btn-group-sm > .btn {
    padding: 0.2rem 0.4rem;
    font-size: 0.75rem;
}

.alert {
    border-radius: 10px;
    font-size: 0.9rem;
}

.alert-success {
    background: rgba(52, 211, 153, 0.1);
    border-color: rgba(52, 211, 153, 0.2);
    color: var(--color-success);
}

.alert-danger {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.2);
    color: var(--color-danger);
}

.alert-warning {
    background: rgba(251, 191, 36, 0.1);
    border-color: rgba(251, 191, 36, 0.2);
    color: var(--color-warning);
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .pricing-card {
        padding: 1.75rem;
    }

    .auth-card {
        padding: 1.5rem;
    }

    .hero-section {
        padding: 2rem 0 1.5rem;
    }

    .section-dark,
    .section-light {
        padding: 2.5rem 0;
    }

    .feature2-crop {
        overflow: hidden;
        border-radius: 8px;
    }
    .feature2-crop img {
        margin-top: -18%;
    }
}

#rhot-widget {
    max-width: 480px;
    margin: 2rem auto 3.5rem;
    text-align: center;
}

.rhot-btn-bar {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.rhot-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.2s;
}

.rhot-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
}

.rhot-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.rhot-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin: 0 0 0.25rem;
}

.rhot-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0 0 0.5rem;
}

.rhot-canvas {
    width: 100%;
    max-width: 400px;
    height: 220px;
    display: block;
    margin: 0 auto;
}

.rhot-pt {
    display: inline-block;
    margin-top: 0.5rem;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
}

.google-oauth-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 20px;
    background: #fff;
    color: #3c4043;
    border: 1px solid #dadce0;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}

.google-oauth-btn:hover {
    background: #f7f8f8;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
    color: #3c4043;
    text-decoration: none;
}

.divider-text {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.divider-text::before,
.divider-text::after {
    content: "";
    flex: 1;
    border-bottom: 1px solid var(--color-border);
}

.divider-text span {
    padding: 0 12px;
}