body {
    background:
        radial-gradient(circle at top left, rgba(51, 103, 193, 0.10), transparent 34%),
        radial-gradient(circle at top right, rgba(246, 209, 122, 0.16), transparent 30%),
        linear-gradient(180deg, #f8f4ee 0%, #f5efe6 100%);
    color: #1f2937;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

:root {
    --intro-radius: 0.5rem;
    --intro-radius-lg: 0.875rem;
    --intro-accent: #3367c1;
    --intro-accent-hover: #313131;
    --intro-text-muted: #6b7280;
    --intro-surface: rgba(255, 255, 255, 0.92);
    --intro-footer: #1f2937;
}

.container-flex {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 20px;
}
.logo-container {
    margin-bottom: 30px;
    text-align: center;
}
.logo {
    max-width: 300px;
    height: auto;
}
.btn-block-custom {
    padding: 25px;
    border-radius: var(--intro-radius-lg);
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: var(--intro-surface);
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.04), 0 20px 45px rgba(15, 23, 42, 0.10);
    margin-bottom: 30px;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.btn-block-custom:hover,
.btn-block-custom:focus-within {
    transform: translateY(-6px);
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.05), 0 28px 52px rgba(15, 23, 42, 0.14);
}
.btn-block-custom h3 {
    color: #111827;
}

.btn-block-custom div {
    color: var(--intro-text-muted);
}
.btn-custom {
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: var(--intro-radius) !important;
    border: 0 !important;
    font-weight: 700;
    letter-spacing: 0.4px;
    transition: opacity 0.2s ease, background-color 0.2s ease;
}

.btn-custom.btn-primary,
.btn-custom.btn-success {
    background: var(--intro-accent) !important;
    color: #fff !important;
}

.btn-custom.btn-primary:hover,
.btn-custom.btn-primary:focus,
.btn-custom.btn-primary:active,
.btn-custom.btn-success:hover,
.btn-custom.btn-success:focus,
.btn-custom.btn-success:active {
    background: var(--intro-accent) !important;
    color: #fff !important;
    opacity: 0.78;
    box-shadow: none !important;
}
.footer {
    background-color: var(--intro-footer);
    color: white;
    padding: 24px 0;
    margin-top: auto;
}
.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin: 0 6px;
    font-size: 1.1rem;
    color: #fff !important;
    background: var(--intro-accent);
    border: 1px solid var(--intro-accent);
    border-radius: var(--intro-radius-lg);
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.social-links a:hover {
    color: #111111 !important;
    background: var(--intro-accent-hover);
    border-color: var(--intro-accent-hover);
    text-decoration: none;
}
.footer .text-md-left a,
.footer .text-md-left a:visited,
.offer-link {
    color: #ffffff !important;
}

.footer .text-md-left a:hover,
.footer .text-md-left a:focus,
.footer .text-md-left a:active,
.offer-link:hover,
.offer-link:focus,
.offer-link:active {
    color: var(--intro-accent) !important;
    text-decoration: underline;
}
.welcome-text {
    text-align: center;
    margin-bottom: 40px;
}

.welcome-text h1 {
    color: #111827;
}

.welcome-text .lead {
    color: #374151;
}

.welcome-text > div:last-child {
    color: var(--intro-text-muted);
}