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

:root {
    --topbar-height: 56px;
    --page-max: 1200px;
    --content-max: 580px;
    --color-bg: #ffffff;
    --color-fg: #000000;
    --color-footer-bg: #000000;
    --color-footer-fg: #ffffff;
    --color-email: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-blur: blur(16px);
    --font: 'Inter', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background-color: var(--color-bg);
    color: var(--color-fg);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    cursor: default;
}

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--topbar-height);
    background: transparent;
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.topbar.scrolled {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}

.topbar-inner {
    max-width: var(--page-max);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 clamp(24px, 5vw, 80px);
}

.logo-top {
    height: 20px;
    width: auto;
    display: block;
}

.main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: calc(var(--topbar-height) + clamp(48px, 8vw, 96px));
    padding-bottom: clamp(48px, 8vw, 96px);
    padding-left: clamp(24px, 5vw, 80px);
    padding-right: clamp(24px, 5vw, 80px);
}

.content {
    width: 100%;
    max-width: var(--content-max);
}

.slogan {
    font-size: clamp(32px, 5.5vw, 64px);
    font-weight: 500;
    line-height: 1.08;
    letter-spacing: -0.05em;
    color: var(--color-fg);
    margin-bottom: clamp(24px, 3.5vw, 40px);
}

.icons {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: clamp(32px, 5vw, 64px);
    flex-wrap: wrap;
}

.icon {
    width: 48px;
    height: 48px;
    display: block;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
}

.body-text {
    display: flex;
    flex-direction: column;
    gap: clamp(16px, 2vw, 24px);
}

.body-text p {
    font-size: clamp(15px, 1.6vw, 20px);
    font-weight: 400;
    line-height: 1.55;
    letter-spacing: -0.02em;
    color: var(--color-fg);
}

.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-fg);
    padding: clamp(32px, 5vw, 56px) clamp(24px, 5vw, 80px);
}

.footer-inner {
    max-width: var(--page-max);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}

.logo-bottom {
    height: 18px;
    width: auto;
    display: block;
    margin-bottom: 4px;
}

.footer-text {
    font-size: clamp(13px, 1.2vw, 16px);
    font-weight: 400;
    line-height: 1.55;
    letter-spacing: -0.02em;
    color: var(--color-footer-fg);
}

.footer-email {
    font-size: clamp(13px, 1.2vw, 16px);
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--color-email);
    text-decoration: none;
    position: relative;
    display: inline-block;
}

.footer-email::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 0;
    height: 1px;
    background: var(--color-email);
    transition: width 0.25s ease;
}

.footer-email:hover::after {
    width: 100%;
}

@media (min-height: 700px) {
    body {
        min-height: 100dvh;
    }

    .main {
        min-height: calc(100dvh - var(--topbar-height) - 160px);
    }
}

@media (max-width: 480px) {
    .slogan {
        font-size: clamp(28px, 8vw, 40px);
    }

    .icon {
        width: 40px;
        height: 40px;
    }

    .icons {
        gap: 12px;
    }
}