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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(180deg, #3879FF 13%, #D1E0FF 100%);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
}

.container {
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.intro-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
}

.intro-content {
    flex: 1 1 400px;
    min-width: 300px;
    animation: fadeInUp 0.8s ease-out;
}

.intro-title {
    /* Scales down between the two-column breakpoint and 1440px so the Korean
       title stays on one line instead of breaking mid-word */
    font-size: clamp(44px, 4.2vw, 60px);
    font-weight: 800;
    color: white;
    margin-bottom: 20px;
    line-height: 1.15;
    letter-spacing: -0.02em;
    word-break: keep-all;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

/* Logo lockup used instead of a plain text title on the English home page */
.intro-brand {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 18px;
}

.intro-brand__icon {
    width: 76px;
    height: 76px;
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.intro-brand__wordmark {
    font-size: 60px;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1;
    color: #ffffff;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.intro-brand__wordmark em {
    font-style: normal;
    color: #B9CEFF;
}

.intro-subtitle {
    font-size: 28px;
    color: white;
    margin-bottom: 44px;
    line-height: 1.5;
    font-weight: 500;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.08);
}

/* Longer, multi-line taglines read better a step down */
.intro-subtitle--compact {
    font-size: 23px;
}

.app-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.app-link {
    display: inline-block;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
}

.app-link:hover {
    transform: translateY(-4px);
    filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.2));
}

.app-link:active {
    transform: translateY(-2px);
}

.app-link img {
    height: 60px;
    width: auto;
    display: block;
    border-radius: 8px;
}

/* Adjust Google Play badge size to match App Store badge better */
.app-link:nth-child(2) img {
    height: 88px;
    margin-top: -14px;
    margin-bottom: -14px;
}

.intro-image-area {
    flex: 1.55 1 460px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 300px;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.intro-image {
    max-width: 100%;
    height: auto;
    max-height: 820px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
    transition: transform 0.3s ease;
}

.intro-image:hover {
    transform: scale(1.02);
}

/* Responsive design */
@media (max-width: 968px) {
    .intro-section {
        flex-direction: column;
        text-align: center;
        gap: 32px;
    }

    /* The desktop column split is horizontal; keep its basis out of the stack */
    .intro-content,
    .intro-image-area {
        flex: 0 0 auto;
        width: 100%;
    }

    .intro-title {
        font-size: 52px;
    }

    .intro-brand {
        justify-content: center;
        gap: 16px;
    }

    .intro-brand__icon {
        width: 64px;
        height: 64px;
        border-radius: 17px;
    }

    .intro-brand__wordmark {
        font-size: 52px;
    }

    .intro-subtitle {
        font-size: 24px;
    }

    .app-links {
        justify-content: center;
    }

    .intro-image {
        max-height: 500px;
    }
}

@media (max-width: 640px) {
    .main-content {
        padding: 30px 24px;
    }

    .intro-section {
        gap: 20px;
    }

    .intro-title {
        font-size: 38px;
        margin-bottom: 24px;
        line-height: 1.2;
    }

    .intro-brand {
        gap: 12px;
        margin-bottom: 22px;
    }

    .intro-brand__icon {
        width: 50px;
        height: 50px;
        border-radius: 13px;
    }

    .intro-brand__wordmark {
        font-size: 40px;
    }

    .intro-subtitle {
        font-size: 17px;
        margin-bottom: 30px;
    }

    .intro-subtitle--compact {
        font-size: 16px;
    }

    .app-links {
        gap: 12px;
    }

    .app-link img {
        height: 48px;
    }

    .app-link:nth-child(2) img {
        height: 70px;
        margin-top: -11px;
        margin-bottom: -11px;
    }

    .intro-image {
        max-height: 400px;
    }
}

/* Extra small screens like iPhone SE */
@media (max-width: 375px) {
    .main-content {
        padding: 24px 20px;
    }

    .intro-title {
        font-size: 32px;
        margin-bottom: 14px;
    }

    .intro-brand__icon {
        width: 44px;
        height: 44px;
        border-radius: 12px;
    }

    .intro-brand__wordmark {
        font-size: 34px;
    }

    .intro-subtitle {
        font-size: 16px;
        margin-bottom: 26px;
    }

    .intro-subtitle--compact {
        font-size: 15px;
    }

    .app-links {
        gap: 10px;
    }

    .app-link img {
        height: 44px;
    }

    .app-link:nth-child(2) img {
        height: 64px;
        margin-top: -10px;
        margin-bottom: -10px;
    }
}