css
/* =========================================
   WASA BILL ONLINE GUIDE
   Main Stylesheet
   ========================================= */

/* ---------- Base ---------- */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.7;
    color: #263238;
    background: #ffffff;
}

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

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

.container {
    width: min(1120px, 92%);
    margin: 0 auto;
}


/* ---------- Header ---------- */

.site-header {
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: #0f4c5c;
    white-space: nowrap;
}

.navigation {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 22px;
}

.navigation a {
    font-size: 0.94rem;
    font-weight: 600;
    color: #374151;
    transition: color 0.2s ease;
}

.navigation a:hover {
    color: #0f766e;
}


/* ---------- Hero ---------- */

.hero {
    background: linear-gradient(
        135deg,
        #ecfeff 0%,
        #f8fafc 55%,
        #ffffff 100%
    );

    padding: 95px 0 90px;
    border-bottom: 1px solid #e5e7eb;
}

.hero-content {
    max-width: 850px;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 18px;
    color: #0f766e;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero h1 {
    max-width: 900px;
    margin-bottom: 22px;
    color: #17202a;
    font-size: clamp(2.2rem, 5vw, 4rem);
    line-height: 1.12;
    letter-spacing: -0.03em;
}

.hero-description {
    max-width: 760px;
    margin-bottom: 32px;
    color: #4b5563;
    font-size: 1.12rem;
}

.primary-button {
    display: inline-block;
    padding: 13px 22px;
    border-radius: 7px;
    background: #0f766e;
    color: #ffffff;
    font-weight: 700;
    transition:
        background 0.2s ease,
        transform 0.2s ease;
}

.primary-button:hover {
    background: #115e59;
    transform: translateY(-1px);
}


/* ---------- General Sections ---------- */

.content-section,
.cards-section {
    padding: 78px 0;
}

.content-section h2,
.cards-section h2,
.disclaimer-section h2 {
    margin-bottom: 24px;
    color: #17202a;
    font-size: clamp(1.75rem, 3vw, 2.35rem);
    line-height: 1.25;
}

.content-section h3 {
    margin-top: 30px;
    margin-bottom: 12px;
    color: #263238;
    font-size: 1.3rem;
    line-height: 1.35;
}

.content-section p {
    max-width: 850px;
    margin-bottom: 18px;
    color: #4b5563;
    font-size: 1rem;
}

.content-section strong {
    color: #263238;
}


/* ---------- Light Sections ---------- */

.light-section {
    background: #f8fafc;
    border-top: 1px solid #eef2f7;
    border-bottom: 1px solid #eef2f7;
}


/* ---------- Notice Box ---------- */

.notice-box {
    max-width: 850px;
    margin-top: 28px;
    padding: 20px 22px;
    border-left: 4px solid #0f766e;
    background: #f0fdfa;
    color: #334155;
    border-radius: 0 7px 7px 0;
}

.notice-box strong {
    color: #115e59;
}


/* ---------- Cards ---------- */

.cards-section {
    background: #ffffff;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}

.info-card {
    padding: 28px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    box-shadow: 0 5px 18px rgba(15, 23, 42, 0.04);
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.info-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.card-number {
    margin-bottom: 14px;
    color: #0f766e;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.1em;
}

.info-card h3 {
    margin-bottom: 12px;
    color: #17202a;
    font-size: 1.2rem;
    line-height: 1.35;
}

.info-card p {
    margin-bottom: 18px;
    color: #667085;
    font-size: 0.95rem;
}

.info-card a {
    color: #0f766e;
    font-weight: 700;
    font-size: 0.92rem;
}


/* ---------- Information List ---------- */

.information-list {
    max-width: 850px;
    margin: 25px 0;
    padding-left: 25px;
    color: #4b5563;
}

.information-list li {
    margin-bottom: 9px;
    padding-left: 5px;
}


/* ---------- Steps ---------- */

.steps {
    max-width: 850px;
    margin-top: 30px;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 22px 0;
    border-bottom: 1px solid #e5e7eb;
}

.step:first-child {
    border-top: 1px solid #e5e7eb;
}

.step-number {
    flex: 0 0 38px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #0f766e;
    color: #ffffff;
    font-weight: 800;
}

.step h3 {
    margin: 0 0 6px;
    color: #263238;
    font-size: 1.12rem;
}

.step p {
    margin: 0;
}


/* ---------- FAQ ---------- */

.faq-list {
    max-width: 850px;
}

.faq-list details {
    border-bottom: 1px solid #e5e7eb;
    padding: 0;
}

.faq-list details:first-child {
    border-top: 1px solid #e5e7eb;
}

.faq-list summary {
    position: relative;
    padding: 21px 42px 21px 0;
    cursor: pointer;
    list-style: none;
    color: #263238;
    font-size: 1.04rem;
    font-weight: 700;
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: "+";
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    color: #0f766e;
    font-size: 1.5rem;
    font-weight: 400;
}

.faq-list details[open] summary::after {
    content: "−";
}

.faq-list details p {
    padding: 0 42px 22px 0;
    margin: 0;
}


/* ---------- Disclaimer ---------- */

.disclaimer-section {
    padding: 65px 0;
    background: #f1f5f9;
    border-top: 1px solid #e2e8f0;
}

.disclaimer-section p {
    max-width: 850px;
    margin-bottom: 15px;
    color: #64748b;
}


/* ---------- Footer ---------- */

.site-footer {
    background: #17202a;
    color: #d1d5db;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 50px;
    padding: 55px 0 40px;
}

.footer-content h2 {
    margin-bottom: 12px;
    color: #ffffff;
    font-size: 1.25rem;
}

.footer-content p {
    max-width: 520px;
    color: #9ca3af;
    font-size: 0.92rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    max-width: 400px;
}

.footer-links a {
    color: #d1d5db;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    padding: 20px 0;
    border-top: 1px solid #374151;
}

.footer-bottom p {
    color: #9ca3af;
    font-size: 0.85rem;
}


/* ---------- Responsive: Tablet ---------- */

@media (max-width: 900px) {

    .header-container {
        flex-direction: column;
        align-items: flex-start;
        padding: 18px 0;
    }

    .navigation {
        justify-content: flex-start;
        gap: 12px 18px;
    }

    .hero {
        padding: 75px 0;
    }

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

    .footer-content {
        flex-direction: column;
    }

}


/* ---------- Responsive: Mobile ---------- */

@media (max-width: 600px) {

    .container {
        width: min(92%, 520px);
    }

    .site-header {
        position: relative;
    }

    .header-container {
        gap: 15px;
    }

    .logo {
        font-size: 1.2rem;
    }

    .navigation {
        width: 100%;
        gap: 9px 15px;
    }

    .navigation a {
        font-size: 0.86rem;
    }

    .hero {
        padding: 62px 0 60px;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .content-section,
    .cards-section {
        padding: 58px 0;
    }

    .content-section h2,
    .cards-section h2,
    .disclaimer-section h2 {
        font-size: 1.75rem;
    }

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

    .info-card {
        padding: 24px;
    }

    .step {
        gap: 14px;
    }

    .step-number {
        flex-basis: 34px;
        width: 34px;
        height: 34px;
    }

    .footer-content {
        padding: 45px 0 30px;
    }

    .footer-links {
        flex-direction: column;
        gap: 10px;
    }

}


/* ---------- Accessibility ---------- */

a:focus-visible,
summary:focus-visible {
    outline: 3px solid #5eead4;
    outline-offset: 3px;
}


/* ---------- Reduced Motion ---------- */

@media (prefers-reduced-motion: reduce) {

    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition: none !important;
    }

}