:root {
    --ink: #17211d;
    --muted: #5e6863;
    --line: #dde5df;
    --brand: #0f8a5f;
    --brand-dark: #086243;
    --accent: #e2483d;
    --soft: #f5f8f4;
    --paper: #ffffff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Noto Sans Bengali", "Segoe UI", Arial, sans-serif;
    color: var(--ink);
    background: var(--paper);
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px clamp(16px, 4vw, 56px);
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
}

.logo {
    font-weight: 800;
    font-size: 22px;
}

.logo span {
    display: block;
    font-size: 14px;
    color: var(--brand);
}

.call-button,
.primary-btn,
.secondary-btn,
.order-form button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 20px;
    border-radius: 6px;
    font-weight: 700;
    border: 0;
    cursor: pointer;
}

.call-button,
.primary-btn,
.order-form button {
    color: #fff;
    background: var(--brand);
}

.secondary-btn {
    border: 1px solid var(--line);
    background: #fff;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(300px, 520px);
    gap: clamp(24px, 5vw, 64px);
    align-items: center;
    padding: clamp(28px, 5vw, 72px) clamp(16px, 4vw, 56px);
    background: linear-gradient(180deg, #f8fbf7 0%, #fff 100%);
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--brand);
    font-weight: 800;
}

h1,
h2 {
    margin: 0;
    line-height: 1.15;
}

h1 {
    max-width: 720px;
    font-size: clamp(34px, 6vw, 64px);
}

h2 {
    font-size: clamp(24px, 3.2vw, 38px);
}

.lead {
    max-width: 650px;
    color: var(--muted);
    font-size: 18px;
    line-height: 1.75;
}

.price-row {
    display: flex;
    align-items: baseline;
    gap: 14px;
    margin: 22px 0;
}

.old-price {
    color: var(--muted);
    font-size: 22px;
    text-decoration: line-through;
}

.new-price {
    color: var(--accent);
    font-size: 42px;
    font-weight: 900;
}

.hero-actions,
.trust-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.trust-strip {
    margin-top: 20px;
}

.trust-strip span {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    color: var(--muted);
    font-weight: 700;
}

.product-gallery {
    display: grid;
    gap: 12px;
}

.main-product-image {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.thumb-grid img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border: 1px solid var(--line);
    border-radius: 6px;
    cursor: pointer;
}

.section {
    padding: clamp(34px, 5vw, 72px) clamp(16px, 4vw, 56px);
}

.section > h2 {
    margin-bottom: 24px;
}

.feature-grid,
.review-grid,
.info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.feature-card,
.review-grid article,
.info-grid > div,
.summary-box {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.feature-card {
    padding: 18px;
    font-weight: 800;
}

.feature-card::before {
    content: "✓";
    margin-right: 8px;
    color: var(--brand);
}

.video-section,
.order-section {
    background: var(--soft);
}

.video-frame {
    max-width: 900px;
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--line);
}

.video-frame iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

.empty-video {
    padding: 28px;
    border: 1px dashed var(--line);
    border-radius: 8px;
    background: #fff;
}

.review-grid article,
.info-grid > div {
    padding: 20px;
    line-height: 1.7;
}

details {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
}

summary {
    cursor: pointer;
    font-weight: 800;
}

.order-section {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(300px, 1fr);
    gap: 24px;
    padding: clamp(34px, 5vw, 72px) clamp(16px, 4vw, 56px);
}

.summary-box {
    max-width: 430px;
    padding: 18px;
}

.summary-box div {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
}

.summary-box div:last-child {
    border-bottom: 0;
}

.summary-box .total {
    color: var(--accent);
    font-size: 20px;
}

.order-form {
    display: grid;
    gap: 14px;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

label {
    display: grid;
    gap: 7px;
    font-weight: 800;
}

input,
textarea,
select {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--line);
    border-radius: 6px;
    color: var(--ink);
    font: inherit;
    background: #fff;
}

fieldset {
    margin: 0;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
}

legend {
    padding: 0 6px;
    font-weight: 800;
}

.radio-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 10px 0;
}

.radio-row input {
    width: auto;
}

.order-form button {
    width: 100%;
    font-size: 18px;
}

.order-form button:disabled {
    cursor: not-allowed;
    background: #9da7a2;
}

.site-footer {
    padding: 24px;
    text-align: center;
    color: var(--muted);
    border-top: 1px solid var(--line);
}

.success-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 16px;
    background: var(--soft);
}

.success-card {
    width: min(620px, 100%);
    padding: 30px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    text-align: center;
}

.success-card .summary-box {
    margin: 20px auto;
    text-align: left;
}

@media (max-width: 860px) {
    .hero,
    .order-section,
    .feature-grid,
    .review-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .site-header {
        align-items: flex-start;
    }
}

@media (max-width: 520px) {
    .new-price {
        font-size: 34px;
    }

    .thumb-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}