:root {
    --color-bg: #f7f9fa;
    --color-surface: #ffffff;
    --color-ink: #14232b;
    --color-ink-soft: #4b5c63;
    --color-border: #e2e8ea;
    --color-brand: #0f5c66;
    --color-brand-dark: #0b454d;
    --color-accent: #d98c2b;
    --color-success-bg: #eaf6ee;
    --color-success-ink: #1f6b3a;
    --color-error-bg: #fbeaea;
    --color-error-ink: #a3312a;
    --radius: 10px;
    --shadow: 0 1px 2px rgba(20, 35, 43, 0.06), 0 8px 24px rgba(20, 35, 43, 0.06);
    --max-width: 1200px;
    --section-space: 96px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-ink);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-brand);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

.section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
}

.section-head__eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-brand);
    margin: 0 0 10px;
}

.section-head h2 {
    font-size: clamp(1.5rem, 2.4vw, 2rem);
    margin: 0 0 12px;
}

.section-head p {
    color: var(--color-ink-soft);
    font-size: 1.02rem;
    margin: 0;
}

/* Header */

.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.site-header__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 32px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-ink);
}

.brand__mark {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-brand), var(--color-accent));
    flex-shrink: 0;
}

.site-nav {
    display: flex;
    gap: 28px;
    font-weight: 500;
    font-size: 0.95rem;
}

.site-nav a {
    color: var(--color-ink-soft);
}

.trust-strip {
    background: var(--color-brand-dark);
    color: #eaf3f2;
    font-size: 0.85rem;
    text-align: center;
    padding: 10px 16px;
    letter-spacing: 0.02em;
}

/* Hero */

.hero {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.hero__inner {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
    padding: 96px 32px;
}

.hero__eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-brand);
    margin: 0 0 12px;
}

.hero h1 {
    font-size: clamp(1.9rem, 3vw, 2.6rem);
    margin: 0 0 16px;
    line-height: 1.15;
}

.hero p {
    color: var(--color-ink-soft);
    font-size: 1.08rem;
    max-width: 46ch;
    margin: 0 0 32px;
}

.hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 24px;
    margin-top: 28px;
    font-size: 0.88rem;
    color: var(--color-ink-soft);
}

.hero__meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero__image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    aspect-ratio: 4 / 3;
    object-fit: cover;
    width: 100%;
    height: 100%;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: transform 0.05s ease, background 0.15s ease;
}

.btn:active {
    transform: translateY(1px);
}

.btn--primary {
    background: var(--color-brand);
    color: #fff;
}

.btn--primary:hover {
    background: var(--color-brand-dark);
    text-decoration: none;
}

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

/* Feature strip */

.features {
    padding: var(--section-space) 32px;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 28px;
}

.feature-card__icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--color-success-bg);
    color: var(--color-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 18px;
}

.feature-card h3 {
    font-size: 1.05rem;
    margin: 0 0 10px;
}

.feature-card p {
    color: var(--color-ink-soft);
    font-size: 0.95rem;
    margin: 0;
}

/* Breadcrumb */

.breadcrumb {
    padding: 24px 32px 0;
    font-size: 0.85rem;
    color: var(--color-ink-soft);
}

.breadcrumb a {
    color: var(--color-ink-soft);
}

.breadcrumb__sep {
    margin: 0 8px;
    color: var(--color-border);
}

/* FAQ */

.faq {
    padding: var(--section-space) 32px;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.faq__list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq__item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 22px 26px;
}

.faq__item h3 {
    font-size: 1.02rem;
    margin: 0 0 8px;
}

.faq__item p {
    color: var(--color-ink-soft);
    margin: 0;
    font-size: 0.95rem;
}

/* Product page */

.product-layout {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 56px;
    padding: 40px 32px 96px;
}

.gallery__main {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--color-surface);
    aspect-ratio: 1 / 1;
}

.gallery__main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery__thumbs {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-top: 12px;
}

.gallery__thumbs img {
    border-radius: 6px;
    border: 1px solid var(--color-border);
    aspect-ratio: 1 / 1;
    object-fit: cover;
    cursor: pointer;
}

.gallery__thumbs img.is-active {
    border-color: var(--color-brand);
    box-shadow: 0 0 0 2px rgba(15, 92, 102, 0.2);
}

.buy-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow);
    align-self: start;
    position: sticky;
    top: 104px;
}

.buy-box__brand {
    color: var(--color-brand);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0 0 6px;
}

.buy-box h1 {
    font-size: 1.5rem;
    margin: 0 0 12px;
    line-height: 1.25;
}

.buy-box__price {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 4px;
}

.buy-box__price-note {
    color: var(--color-ink-soft);
    font-size: 0.88rem;
    margin: 0 0 20px;
}

.field {
    margin-bottom: 18px;
}

.field label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
}

.field select,
.field input[type="number"] {
    width: 100%;
    padding: 10px 12px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    font-size: 1rem;
    background: #fff;
    color: var(--color-ink);
}

.alert {
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 0.9rem;
    margin-bottom: 18px;
}

.alert--error {
    background: var(--color-error-bg);
    color: var(--color-error-ink);
}

.reassurance {
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-ink-soft);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.product-details {
    padding: 0 32px 96px;
}

.product-details__inner {
    max-width: 760px;
    margin: 0 auto;
}

.product-details h2 {
    font-size: 1.4rem;
    margin: 56px 0 20px;
}

.product-details h2:first-child {
    margin-top: 0;
}

.product-details p {
    color: var(--color-ink-soft);
    white-space: pre-line;
    font-size: 1.02rem;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.spec-table td {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
}

.spec-table td:first-child {
    color: var(--color-ink-soft);
    width: 40%;
}

/* Success page */

.status-page {
    max-width: 560px;
    margin: 80px auto;
    text-align: center;
    padding: 0 24px;
}

.status-page__icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-success-bg);
    color: var(--color-success-ink);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.6rem;
}

.status-page h1 {
    margin: 0 0 12px;
}

.status-page p {
    color: var(--color-ink-soft);
}

/* Footer */

.site-footer {
    border-top: 1px solid var(--color-border);
    margin-top: 32px;
    background: var(--color-surface);
}

.site-footer__grid {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 64px 32px 40px;
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
}

.site-footer h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0 0 18px;
    color: var(--color-ink);
}

.site-footer p {
    color: var(--color-ink-soft);
    font-size: 0.92rem;
    margin: 0 0 12px;
    max-width: 40ch;
}

.site-footer ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.site-footer ul a {
    color: var(--color-ink-soft);
    font-size: 0.92rem;
}

.site-footer__bottom {
    border-top: 1px solid var(--color-border);
    padding: 20px 32px;
    text-align: center;
    color: var(--color-ink-soft);
    font-size: 0.82rem;
}

@media (max-width: 860px) {
    .hero__inner,
    .product-layout,
    .features__grid,
    .site-footer__grid {
        grid-template-columns: 1fr;
    }

    .buy-box {
        position: static;
    }
}