* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;

    color: #172033;
    background:
        linear-gradient(180deg,
            #eefaff 0%,
            #ffffff 55%);

    line-height: 1.6;
}


/* -----------------------
   HOME PAGE
------------------------ */

.container {
    width: min(1100px, 90%);
    margin: 0 auto;
}

.hero {
    min-height: 620px;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    text-align: center;

    padding: 70px 20px;
}

.app-icon {
    width: 180px;
    height: 180px;

    object-fit: cover;

    border-radius: 38px;

    box-shadow:
        0 20px 50px rgba(0, 122, 255, 0.18);

    margin-bottom: 30px;
}

.hero h1 {
    margin: 0;

    font-size: clamp(44px, 7vw, 72px);
    line-height: 1.1;

    color: #0b74e5;
}

.hero h2 {
    margin: 10px 0 20px;

    font-size: clamp(24px, 4vw, 36px);
    font-weight: 600;
}

.tagline {
    max-width: 650px;

    margin: 5px auto;

    font-size: 21px;
    color: #667085;
}

.tagline.chinese {
    font-size: 19px;
}


/* -----------------------
   FEATURES
------------------------ */

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;

    padding: 40px 0 90px;
}

.feature {
    padding: 35px;

    background: rgba(255, 255, 255, 0.8);

    border: 1px solid #e5e7eb;
    border-radius: 24px;

    text-align: center;

    box-shadow:
        0 12px 35px rgba(15, 23, 42, 0.06);
}

.feature-icon {
    font-size: 44px;
}

.feature h3 {
    margin: 15px 0 8px;

    font-size: 22px;
}

.feature p {
    margin: 0;

    color: #667085;
}


/* -----------------------
   ABOUT
------------------------ */

.about {
    max-width: 720px;

    margin: 0 auto;
    padding: 40px 20px 100px;

    text-align: center;
}

.about h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.about p {
    font-size: 18px;
    color: #667085;
}


/* -----------------------
   PRIVACY / SUPPORT
------------------------ */

.legal-container {
    width: min(760px, 90%);

    min-height: 80vh;

    margin: 0 auto;
    padding: 70px 0 100px;
}

.legal-container h1 {
    margin-top: 35px;

    font-size: 42px;
    line-height: 1.2;
}

.legal-container h2 {
    margin-top: 40px;

    font-size: 24px;
}

.legal-container p,
.legal-container li {
    font-size: 17px;
    color: #475467;
}

.last-updated {
    color: #98a2b3 !important;
}

.back-link {
    color: #087ff5;

    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}


/* -----------------------
   SUPPORT
------------------------ */

.support-intro {
    font-size: 21px !important;
}

.instructions {
    padding-left: 24px;
}

.instructions li {
    margin-bottom: 10px;
}

.support-card {
    margin-top: 50px;
    padding: 30px;

    background: #edf8ff;

    border: 1px solid #cceaff;
    border-radius: 22px;
}

.support-card h2 {
    margin-top: 0;
}

.email-button {
    display: inline-block;

    margin-top: 10px;
    padding: 12px 20px;

    background: #087ff5;
    color: white;

    border-radius: 12px;

    text-decoration: none;
    font-weight: 600;
}

.email-button:hover {
    opacity: 0.88;
}


/* -----------------------
   FOOTER
------------------------ */

footer {
    padding: 35px 20px;

    text-align: center;

    border-top: 1px solid #e5e7eb;

    color: #98a2b3;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;

    margin-bottom: 12px;
}

.footer-links a {
    color: #667085;
    text-decoration: none;
}

.footer-links a:hover {
    color: #087ff5;
}


/* -----------------------
   MOBILE
------------------------ */

@media (max-width: 700px) {

    .hero {
        min-height: auto;
        padding-top: 70px;
        padding-bottom: 70px;
    }

    .app-icon {
        width: 140px;
        height: 140px;

        border-radius: 30px;
    }

    .features {
        grid-template-columns: 1fr;

        padding-bottom: 60px;
    }

    .feature {
        padding: 28px;
    }

    .legal-container {
        padding-top: 40px;
    }

    .legal-container h1 {
        font-size: 34px;
    }
}