/* =============================================
   VERNIS - Premium NFT Preservation
   Main Stylesheet
   ============================================= */

/* ---------------------------------------------
   CSS Variables / Design Tokens
   --------------------------------------------- */
:root {
    /* Colors */
    --color-black: #0a0a0a;
    --color-charcoal: #1a1a1a;
    --color-dark-gray: #2a2a2a;
    --color-gray: #666666;
    --color-light-gray: #999999;
    --color-gold: #c9a54e;
    --color-gold-light: #e0c06f;
    --color-gold-dark: #a8863d;
    --color-white: #ffffff;
    --color-off-white: #f5f5f5;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --section-padding: 6rem 5%;
    --section-padding-mobile: 4rem 5%;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 20px 60px rgba(0, 0, 0, 0.4);
}

/* ---------------------------------------------
   Reset & Base Styles
   --------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-black);
    color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ---------------------------------------------
   Typography
   --------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
}

/* ---------------------------------------------
   Buttons
   --------------------------------------------- */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-family: var(--font-sans);
}

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

.btn-primary:hover {
    background: var(--color-gold-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 1px solid var(--color-dark-gray);
}

.btn-secondary:hover {
    border-color: var(--color-gold);
    color: var(--color-gold);
}

.btn-block {
    width: 100%;
    display: block;
}

/* ---------------------------------------------
   Navigation
   --------------------------------------------- */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: linear-gradient(to bottom, rgba(10, 10, 10, 0.98), rgba(10, 10, 10, 0));
    transition: background var(--transition-normal);
}

.nav.scrolled {
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
}

.nav__logo {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--color-white);
}

.nav__links {
    display: flex;
    gap: 2.5rem;
}

.nav__links a {
    color: var(--color-light-gray);
    font-size: 0.9rem;
    font-weight: 400;
    transition: color var(--transition-normal);
}

.nav__links a:hover {
    color: var(--color-gold);
}

.nav__cta {
    background: var(--color-gold);
    color: var(--color-black);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    transition: all var(--transition-normal);
}

.nav__cta:hover {
    background: var(--color-gold-light);
    transform: translateY(-2px);
}

/* Mobile Menu Button */
.nav__mobile-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.nav__mobile-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--color-white);
    margin: 5px 0;
    transition: all var(--transition-normal);
    border-radius: 2px;
}

.nav__mobile-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav__mobile-btn.active span:nth-child(2) {
    opacity: 0;
}

.nav__mobile-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.nav__mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-black);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.nav__mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.nav__mobile-menu a {
    font-size: 1.5rem;
    color: var(--color-white);
    transition: color var(--transition-normal);
}

.nav__mobile-menu a:hover {
    color: var(--color-gold);
}

/* ---------------------------------------------
   Section Styles
   --------------------------------------------- */
section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--color-light-gray);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.05rem;
}

/* ---------------------------------------------
   Hero Section
   --------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 5% 4rem;
    background: radial-gradient(ellipse at center top, rgba(201, 165, 78, 0.08) 0%, transparent 50%),
                var(--color-black);
    position: relative;
    overflow: hidden;
}

.hero__tagline {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    color: var(--color-gold);
    margin-bottom: 1.5rem;
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    margin-bottom: 1.5rem;
    max-width: 800px;
}

.hero__description {
    font-size: 1.15rem;
    color: var(--color-light-gray);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.hero__buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Floating decoration */
.hero__decoration {
    position: absolute;
    width: 400px;
    height: 400px;
    border: 1px solid rgba(201, 165, 78, 0.1);
    border-radius: 50%;
    pointer-events: none;
}

.hero__decoration--1 {
    top: 10%;
    right: -10%;
    animation: float 20s ease-in-out infinite;
}

.hero__decoration--2 {
    bottom: 10%;
    left: -10%;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(20px, 20px) rotate(5deg); }
}

/* ---------------------------------------------
   Problem Section
   --------------------------------------------- */
.problem {
    background: var(--color-charcoal);
}

.problem__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.problem__card {
    background: var(--color-dark-gray);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.problem__card:hover {
    border-color: rgba(201, 165, 78, 0.3);
    transform: translateY(-4px);
}

.problem__card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.25rem;
    color: var(--color-gold);
}

.problem__card h3 {
    font-family: var(--font-sans);
    color: var(--color-gold);
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.problem__card p {
    color: var(--color-light-gray);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ---------------------------------------------
   Products Section
   --------------------------------------------- */
.products {
    background: var(--color-black);
}

.products__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.product-card {
    background: var(--color-charcoal);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--color-dark-gray);
    transition: all var(--transition-normal);
    position: relative;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.product-card--premium {
    border-color: var(--color-gold);
}

.product-card--premium:hover {
    border-color: var(--color-gold-light);
}

.product-card--featured {
    border-color: var(--color-gold);
    max-width: 480px;
    margin: 0 auto;
}

.product-card--featured:hover {
    border-color: var(--color-gold-light);
}

.products__grid--single {
    grid-template-columns: 1fr;
    max-width: 480px;
}

.products__note {
    text-align: center;
    color: var(--color-light-gray);
    font-size: 0.9rem;
    margin-top: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Product Image */
.product-card__image {
    height: 320px;
    background: linear-gradient(135deg, var(--color-dark-gray) 0%, var(--color-charcoal) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-card__image img {
    transform: scale(1.05);
}

/* Product image placeholder (SVG based) */
.product-card__placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, var(--color-dark-gray) 0%, #151515 100%);
}

.product-card__placeholder svg {
    width: 200px;
    height: auto;
    opacity: 0.9;
}

.product-card__badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--color-gold);
    color: var(--color-black);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Product Content */
.product-card__content {
    padding: 2rem;
}

.product-card__title {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.product-card__price {
    color: var(--color-gold);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.product-card__price span {
    font-size: 0.9rem;
    color: var(--color-light-gray);
    font-weight: 400;
    margin-left: 0.5rem;
}

.product-card__subtitle {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gold);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.product-card__specs {
    margin-bottom: 1.5rem;
}

.product-card__specs li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-dark-gray);
    color: var(--color-light-gray);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.product-card__specs li:last-child {
    border-bottom: none;
}

.product-card__specs li::before {
    content: '';
    width: 18px;
    height: 18px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23c9a54e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
    background-size: contain;
    flex-shrink: 0;
}

/* ---------------------------------------------
   How It Works Section
   --------------------------------------------- */
.how-it-works {
    background: var(--color-charcoal);
}

.how-it-works__steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

/* Connecting line */
.how-it-works__steps::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 15%;
    right: 15%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    z-index: 0;
}

.step {
    text-align: center;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

.step__number {
    width: 60px;
    height: 60px;
    border: 2px solid var(--color-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-gold);
    background: var(--color-charcoal);
    transition: all var(--transition-normal);
}

.step:hover .step__number {
    background: var(--color-gold);
    color: var(--color-black);
}

.step__title {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.step__description {
    color: var(--color-light-gray);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ---------------------------------------------
   Mission Section
   --------------------------------------------- */
.mission {
    background: var(--color-black);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.mission::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(201, 165, 78, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.mission__content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.mission__quote {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-style: italic;
    color: var(--color-off-white);
    margin-bottom: 2rem;
    line-height: 1.5;
}

.mission__quote::before,
.mission__quote::after {
    content: '"';
    color: var(--color-gold);
}

.mission__text {
    color: var(--color-light-gray);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

/* ---------------------------------------------
   FAQ Section
   --------------------------------------------- */
.faq {
    background: var(--color-charcoal);
}

.faq__grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq__item {
    border-bottom: 1px solid var(--color-dark-gray);
    padding: 1.5rem 0;
}

.faq__item:last-child {
    border-bottom: none;
}

.faq__question {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition-normal);
}

.faq__question:hover {
    color: var(--color-gold);
}

.faq__question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--color-gold);
    transition: transform var(--transition-normal);
}

.faq__item.active .faq__question::after {
    transform: rotate(45deg);
}

.faq__answer {
    color: var(--color-light-gray);
    font-size: 0.95rem;
    line-height: 1.7;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq__item.active .faq__answer {
    max-height: 200px;
    padding-top: 1rem;
}

/* ---------------------------------------------
   CTA Section
   --------------------------------------------- */
.cta {
    background: radial-gradient(ellipse at center, rgba(201, 165, 78, 0.12) 0%, transparent 60%),
                var(--color-black);
    text-align: center;
    padding: 8rem 5%;
}

.cta__title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.cta__description {
    color: var(--color-light-gray);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* ---------------------------------------------
   Footer
   --------------------------------------------- */
.footer {
    background: var(--color-charcoal);
    padding: 4rem 5% 2rem;
    border-top: 1px solid var(--color-dark-gray);
}

.footer__content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer__brand {
    max-width: 300px;
}

.footer__logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.footer__tagline {
    color: var(--color-gray);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer__section h4 {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gold);
    margin-bottom: 1.25rem;
    font-weight: 600;
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer__links a {
    color: var(--color-gray);
    font-size: 0.9rem;
    transition: color var(--transition-normal);
}

.footer__links a:hover {
    color: var(--color-gold);
}

.footer__bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--color-dark-gray);
}

.footer__copyright {
    color: var(--color-gray);
    font-size: 0.85rem;
}

/* Social Icons */
.footer__social {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.footer__social a {
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-dark-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.footer__social a:hover {
    border-color: var(--color-gold);
    background: var(--color-gold);
}

.footer__social a:hover svg {
    fill: var(--color-black);
}

.footer__social svg {
    width: 18px;
    height: 18px;
    fill: var(--color-light-gray);
    transition: fill var(--transition-normal);
}

/* ---------------------------------------------
   Responsive Styles
   --------------------------------------------- */
@media (max-width: 1024px) {
    .how-it-works__steps::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav {
        padding: 1rem 5%;
    }

    .nav__links,
    .nav__cta {
        display: none;
    }

    .nav__mobile-btn {
        display: block;
    }

    .nav__mobile-menu {
        display: flex;
    }

    .hero {
        padding: 6rem 5% 3rem;
        min-height: auto;
    }

    .hero__title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .hero__buttons {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .products__grid {
        grid-template-columns: 1fr;
        max-width: 450px;
    }

    section {
        padding: var(--section-padding-mobile);
    }

    .problem__grid {
        grid-template-columns: 1fr;
    }

    .footer__content {
        text-align: center;
    }

    .footer__brand {
        max-width: none;
    }

    .footer__social {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .product-card__content {
        padding: 1.5rem;
    }

    .product-card__image {
        height: 260px;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }
}

/* ---------------------------------------------
   Terms Checkbox
   --------------------------------------------- */
.product-card__terms {
    margin-bottom: 1.25rem;
}

.terms-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--color-light-gray);
    line-height: 1.5;
}

.terms-checkbox input[type="checkbox"] {
    display: none;
}

.terms-checkbox__mark {
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: 2px solid var(--color-dark-gray);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    margin-top: 1px;
}

.terms-checkbox input:checked + .terms-checkbox__mark {
    background: var(--color-gold);
    border-color: var(--color-gold);
}

.terms-checkbox input:checked + .terms-checkbox__mark::after {
    content: '';
    width: 10px;
    height: 10px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a0a0a' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
    background-size: contain;
}

.terms-checkbox__label a {
    color: var(--color-gold);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.terms-checkbox__label a:hover {
    color: var(--color-gold-light);
}

.terms-checkbox.error .terms-checkbox__mark {
    border-color: #e74c3c;
}

/* Disabled mint button state */
.btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ---------------------------------------------
   Legal Pages
   --------------------------------------------- */
.legal-page {
    padding: 8rem 5% 4rem;
    background: var(--color-black);
}

.legal-page__content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-page__content h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 0.5rem;
}

.legal-page__updated {
    color: var(--color-light-gray);
    font-size: 0.9rem;
    margin-bottom: 3rem;
}

.legal-page__content h2 {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-gold);
}

.legal-page__content h3 {
    font-family: var(--font-sans);
    font-size: 1.05rem;
    font-weight: 500;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.legal-page__content p {
    color: var(--color-light-gray);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.legal-page__content ul {
    color: var(--color-light-gray);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    list-style: disc;
}

.legal-page__content li {
    margin-bottom: 0.5rem;
}

.legal-page__content a {
    color: var(--color-gold);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.legal-page__content a:hover {
    color: var(--color-gold-light);
}

.legal-page__content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.legal-page__content th,
.legal-page__content td {
    border: 1px solid var(--color-dark-gray);
    padding: 0.75rem 1rem;
    text-align: left;
    color: var(--color-light-gray);
}

.legal-page__content th {
    background: var(--color-charcoal);
    color: var(--color-white);
    font-weight: 600;
}

.legal-page__note {
    background: rgba(201, 165, 78, 0.1);
    border-left: 3px solid var(--color-gold);
    padding: 1rem 1.25rem;
    border-radius: 0 4px 4px 0;
    font-size: 0.85rem;
    color: var(--color-gold);
}

/* ---------------------------------------------
   Utility Classes
   --------------------------------------------- */
.text-gold {
    color: var(--color-gold);
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }