:root {
    --navy: #07115a;
    --navy-2: #0f1f72;
    --yellow: #fff200;
    --gold: #f6b600;
    --water: #09a7d8;
    --mint: #e8fbf3;
    --ink: #101828;
    --muted: #5d6678;
    --line: #d8e0ee;
    --soft: #f5f8fc;
    --white: #ffffff;
    --shadow: 0 18px 50px rgba(12, 25, 73, 0.14);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: "Noto Sans Bengali", "Hind Siliguri", "Segoe UI", Arial, sans-serif;
    line-height: 1.7;
    background: var(--white);
}

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

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

.container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}

.top-strip {
    background: var(--navy);
    color: var(--white);
    font-size: 14px;
}

.top-strip-inner {
    min-height: 42px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.top-strip a {
    color: var(--yellow);
    font-weight: 700;
}

.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(216, 224, 238, 0.9);
    backdrop-filter: blur(16px);
}

.nav-inner {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand img {
    width: 210px;
    height: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
    font-weight: 700;
    color: #1f2a44;
}

.nav-links a {
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

.nav-links a.active {
    color: var(--navy);
    border-bottom-color: var(--yellow);
}

.nav-call,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 11px 20px;
    border-radius: 8px;
    font-weight: 800;
    line-height: 1.2;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.nav-call,
.btn.primary {
    color: var(--navy);
    background: var(--yellow);
    box-shadow: 0 12px 26px rgba(246, 182, 0, 0.22);
}

.btn.secondary {
    color: var(--white);
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.36);
}

.btn:hover,
.nav-call:hover {
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
}

.nav-toggle span {
    display: block;
    height: 2px;
    margin: 5px 0;
    background: var(--navy);
}

.hero {
    position: relative;
    min-height: 690px;
    display: grid;
    align-items: center;
    overflow: hidden;
    color: var(--white);
}

.hero-media,
.hero-overlay {
    position: absolute;
    inset: 0;
}

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

.hero-overlay {
    background:
        linear-gradient(90deg, rgba(5, 12, 54, 0.93) 0%, rgba(5, 12, 54, 0.72) 37%, rgba(5, 12, 54, 0.14) 78%),
        linear-gradient(180deg, rgba(5, 12, 54, 0.12), rgba(5, 12, 54, 0.42));
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 660px) 260px;
    gap: 48px;
    align-items: end;
}

.hero-copy h1,
.page-hero h1 {
    margin: 0;
    max-width: 760px;
    font-size: clamp(38px, 6vw, 72px);
    line-height: 1.08;
    letter-spacing: 0;
}

.hero-copy p:not(.eyebrow),
.page-hero p:not(.eyebrow) {
    max-width: 660px;
    margin: 24px 0 0;
    font-size: 19px;
    color: rgba(255, 255, 255, 0.88);
}

.eyebrow,
.section-label {
    margin: 0 0 12px;
    color: var(--yellow);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 32px;
}

.hero-card {
    padding: 22px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--navy);
    box-shadow: var(--shadow);
}

.hero-card strong {
    display: block;
    font-size: 30px;
    line-height: 1.2;
}

.hero-card span {
    display: block;
    margin-top: 8px;
    color: var(--muted);
}

.section {
    padding: 92px 0;
}

.section-heading {
    max-width: 760px;
    margin-bottom: 38px;
}

.section-heading.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-label {
    color: var(--water);
}

h2 {
    margin: 0;
    font-size: clamp(28px, 4vw, 46px);
    line-height: 1.18;
    letter-spacing: 0;
}

h3 {
    margin: 0;
    font-size: 24px;
    line-height: 1.25;
}

p {
    color: var(--muted);
}

.two-column,
.split-feature,
.content-layout,
.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
    gap: 48px;
    align-items: start;
}

.problem-section {
    background: var(--soft);
}

.warning-list,
.benefit-grid,
.process-grid,
.service-grid,
.area-tags,
.faq-list {
    display: grid;
    gap: 16px;
}

.warning-list div,
.benefit-grid div,
.process-grid div,
.service-card,
.quote-box,
.booking-form,
.contact-info,
.faq-list details {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: 0 8px 24px rgba(16, 24, 40, 0.06);
}

.warning-list div,
.benefit-grid div {
    padding: 18px 20px;
    font-weight: 800;
}

.services-section {
    background: var(--white);
}

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

.service-card {
    padding: 30px;
}

.service-card span {
    display: inline-grid;
    place-items: center;
    width: 46px;
    height: 46px;
    margin-bottom: 20px;
    border-radius: 8px;
    background: var(--navy);
    color: var(--yellow);
    font-weight: 900;
}

.service-card h3 {
    color: var(--navy);
}

.service-card a,
.text-link {
    color: var(--navy);
    font-weight: 900;
    border-bottom: 2px solid var(--yellow);
}

.process-section {
    background: linear-gradient(180deg, #ffffff 0%, #eef8fb 100%);
}

.process-grid {
    grid-template-columns: repeat(5, 1fr);
}

.process-grid div {
    min-height: 164px;
    padding: 24px;
}

.process-grid strong {
    display: block;
    color: var(--navy);
    margin-bottom: 10px;
}

.process-grid span {
    color: var(--muted);
}

.why-section {
    color: var(--white);
    background: var(--navy);
}

.why-section p {
    color: rgba(255, 255, 255, 0.78);
}

.feature-panel {
    padding-right: 18px;
}

.benefit-grid {
    grid-template-columns: repeat(2, 1fr);
}

.benefit-grid div {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.16);
    color: var(--white);
    box-shadow: none;
}

.area-section {
    background: var(--soft);
}

.area-tags {
    grid-template-columns: repeat(5, 1fr);
}

.area-tags span {
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    color: var(--navy);
    font-weight: 900;
    text-align: center;
}

.video-box {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 8px;
    background: var(--navy);
    box-shadow: var(--shadow);
}

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

.cta-band {
    padding: 56px 0;
    background: var(--yellow);
    color: var(--navy);
}

.cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.cta-inner p {
    color: rgba(7, 17, 90, 0.74);
}

.cta-band .btn.primary {
    background: var(--navy);
    color: var(--white);
}

.page-hero {
    padding: 112px 0;
    color: var(--white);
    background:
        linear-gradient(90deg, rgba(7, 17, 90, 0.94), rgba(7, 17, 90, 0.72)),
        url("../images/water-tank-cleaning-hero.png") center / cover;
}

.page-hero.compact h1 {
    font-size: clamp(34px, 5vw, 58px);
}

.pipeline-bg {
    background:
        linear-gradient(90deg, rgba(7, 17, 90, 0.95), rgba(9, 167, 216, 0.72)),
        url("../images/water-tank-cleaning-hero.png") center / cover;
}

.about-bg,
.contact-bg,
.thank-bg {
    background:
        linear-gradient(90deg, rgba(7, 17, 90, 0.95), rgba(16, 31, 114, 0.68)),
        url("../images/water-tank-cleaning-hero.png") center / cover;
}

.rich-content h2 {
    margin-top: 28px;
    font-size: 32px;
}

.rich-content h2:first-child {
    margin-top: 0;
}

.rich-content ul {
    padding-left: 24px;
    color: var(--muted);
}

.quote-box,
.booking-form,
.contact-info {
    padding: 30px;
}

.quote-box {
    position: sticky;
    top: 110px;
    background: var(--mint);
}

.quote-box h3 {
    color: var(--navy);
    font-size: 34px;
}

.compact-grid {
    grid-template-columns: repeat(2, 1fr);
}

.faq-section {
    background: var(--soft);
}

.faq-list details {
    padding: 20px 24px;
}

.faq-list summary {
    cursor: pointer;
    color: var(--navy);
    font-weight: 900;
}

.contact-grid {
    grid-template-columns: 0.78fr 1fr;
}

.contact-info {
    background: var(--navy);
    color: var(--white);
}

.contact-info p {
    color: rgba(255, 255, 255, 0.75);
}

.contact-line {
    display: block;
    margin-top: 14px;
    color: var(--yellow);
    font-weight: 900;
}

.booking-form {
    display: grid;
    gap: 18px;
}

.booking-form label {
    display: grid;
    gap: 8px;
    color: var(--navy);
    font-weight: 900;
}

.booking-form input,
.booking-form select,
.booking-form textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 13px 14px;
    color: var(--ink);
    font: inherit;
    background: var(--white);
}

.booking-form input:focus,
.booking-form select:focus,
.booking-form textarea:focus {
    outline: 3px solid rgba(9, 167, 216, 0.18);
    border-color: var(--water);
}

.hidden-field {
    position: absolute;
    left: -9999px;
}

.form-alert {
    padding: 12px 14px;
    border-radius: 8px;
    font-weight: 800;
}

.form-alert.error {
    background: #fff0f0;
    color: #9f1d1d;
}

.site-footer {
    background: #060b2f;
    color: var(--white);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 0.7fr 0.9fr;
    gap: 46px;
    padding: 64px 0;
}

.footer-logo {
    width: 190px;
    margin-bottom: 16px;
}

.site-footer h2 {
    font-size: 22px;
    margin-bottom: 16px;
}

.site-footer p {
    color: rgba(255, 255, 255, 0.72);
}

.site-footer a {
    display: block;
    margin: 8px 0;
    color: rgba(255, 255, 255, 0.82);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    padding: 18px 0;
    color: rgba(255, 255, 255, 0.68);
}

.floating-actions {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 60;
    display: flex;
    gap: 8px;
}

.floating-actions a {
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--navy);
    background: var(--yellow);
    font-weight: 900;
    box-shadow: var(--shadow);
}

@media (max-width: 980px) {
    .top-strip-inner,
    .cta-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: absolute;
        top: 78px;
        left: 16px;
        right: 16px;
        display: none;
        padding: 18px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--white);
        box-shadow: var(--shadow);
    }

    .nav-links.open {
        display: grid;
    }

    .hero {
        min-height: 760px;
    }

    .hero-content,
    .two-column,
    .split-feature,
    .content-layout,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .hero-card,
    .quote-box {
        position: static;
    }

    .service-grid,
    .process-grid,
    .area-tags,
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .container {
        width: min(100% - 24px, 1160px);
    }

    .brand img {
        width: 170px;
    }

    .hero {
        min-height: 720px;
    }

    .hero-overlay {
        background: linear-gradient(180deg, rgba(5, 12, 54, 0.92), rgba(5, 12, 54, 0.62));
    }

    .hero-content {
        gap: 24px;
    }

    .hero-copy h1,
    .page-hero.compact h1 {
        font-size: 36px;
    }

    .hero-copy p:not(.eyebrow),
    .page-hero p:not(.eyebrow) {
        font-size: 17px;
    }

    .section {
        padding: 68px 0;
    }

    .service-grid,
    .process-grid,
    .benefit-grid,
    .compact-grid,
    .area-tags,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .floating-actions {
        left: 12px;
        right: 12px;
    }

    .floating-actions a {
        flex: 1;
        text-align: center;
    }
}