:root {
    --bg: #0b0c10;
    --card: rgba(255, 255, 255, .06);
    --fg: rgba(255, 255, 255, .92);
    --muted: rgba(255, 255, 255, .68);
    --border: rgba(255, 255, 255, .14);
    --shadow: 0 18px 60px rgba(0, 0, 0, .35);
    --btn-bg: rgba(255, 255, 255, .08);
    --btn-bg-hover: rgba(255, 255, 255, .12);
    --btn-fg: var(--fg);
    --ring: rgba(255, 255, 255, .22);
}

/* 시스템이 라이트 선호면 기본을 라이트로 */
@media (prefers-color-scheme: light) {
    :root {
        --bg: #f7f8fb;
        --card: rgba(0, 0, 0, .04);
        --fg: rgba(0, 0, 0, .88);
        --muted: rgba(0, 0, 0, .60);
        --border: rgba(0, 0, 0, .10);
        --shadow: 0 18px 60px rgba(0, 0, 0, .10);
        --btn-bg: rgba(0, 0, 0, .05);
        --btn-bg-hover: rgba(0, 0, 0, .08);
        --ring: rgba(0, 0, 0, .20);
    }
}

/* 토글 강제 라이트/다크 */
html[data-theme="dark"] {
    --bg: #0b0c10;
    --card: rgba(255, 255, 255, .06);
    --fg: rgba(255, 255, 255, .92);
    --muted: rgba(255, 255, 255, .68);
    --border: rgba(255, 255, 255, .14);
    --shadow: 0 18px 60px rgba(0, 0, 0, .35);
    --btn-bg: rgba(255, 255, 255, .08);
    --btn-bg-hover: rgba(255, 255, 255, .12);
    --ring: rgba(255, 255, 255, .22);
}

html[data-theme="light"] {
    --bg: #f7f8fb;
    --card: rgba(0, 0, 0, .04);
    --fg: rgba(0, 0, 0, .88);
    --muted: rgba(0, 0, 0, .60);
    --border: rgba(0, 0, 0, .10);
    --shadow: 0 18px 60px rgba(0, 0, 0, .10);
    --btn-bg: rgba(0, 0, 0, .05);
    --btn-bg-hover: rgba(0, 0, 0, .08);
    --ring: rgba(0, 0, 0, .20);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100svh;
    background: radial-gradient(1200px 600px at 50% -200px, rgba(255, 255, 255, .14), transparent 60%),
        radial-gradient(900px 500px at 10% 10%, rgba(120, 120, 255, .10), transparent 55%),
        radial-gradient(900px 500px at 90% 15%, rgba(255, 120, 120, .08), transparent 55%),
        var(--bg);
    color: var(--fg);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR", Arial, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
    line-height: 1.5;
    padding: 28px 16px;
}

.wrap {
    max-width: 560px;
    margin: 0 auto;
}

.topbar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.toggle {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--btn-bg);
    color: var(--btn-fg);
    padding: 10px 12px;
    border-radius: 999px;
    cursor: pointer;
    box-shadow: 0 8px 22px rgba(0, 0, 0, .08);
    transition: transform .08s ease, background .15s ease, border-color .15s ease;
    font-weight: 650;
    letter-spacing: .2px;
}

.toggle:hover {
    background: var(--btn-bg-hover);
}

.toggle:active {
    transform: translateY(1px);
}

.toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--ring);
}

.card {
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--card) 100%, transparent 0%);
    border-radius: 22px;
    padding: 22px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    margin: 0 auto;
    max-width: 480px;
}

.logos {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
    padding: 10px 4px;
}

.logo {
    width: 100%;
    max-width: 300px;
    color: var(--fg);
    /* currentColor로 SVG 색을 통제 */
    opacity: .96;
}

.logo-hangul {
    max-width: 175px !important;
}

.logo-hanja {
    max-width: 175px !important;
}

.logo-roman {
    max-width: 300px !important;
}

.logo svg {
    width: 100%;
    height: auto;
    display: block;
}

.tagline {
    margin: 12px 0 18px;
    text-align: center;
    color: var(--muted);
    font-size: 15px;
    letter-spacing: .2px;
}

/* === Headline Block (slogan + role + description) === */
.headline {
    margin: 14px 0 18px;
    text-align: center;
}

.headline__line {
    margin: 2px 0;
    font-weight: 750;
    letter-spacing: .2px;
    line-height: 1.35;
}

.headline__slogan {
    margin: 2px 0;
    font-size: 32px;
    color: var(--fg);
}

.headline__role {
    font-size: 16px;
    color: var(--muted);
}

/* 작은 강조 장식: 은은한 구분선 */
.divider {
    content: "";
    display: block;
    width: 144px;
    height: 1px;
    margin: 1rem auto;
    background: var(--muted);
    opacity: 0.7;
}

.headline__desc {
    margin: 12px 0 0;
    font-size: 13px;
    color: var(--muted);
    line-height: 1.7;
    letter-spacing: .1px;
}

/* 모바일에서 약간 더 타이트하게 */
@media (max-width: 420px) {
    .headline__slogan {
        font-size: 20px;
    }

    .headline__role {
        font-size: 16px;
    }

    .headline__desc {
        font-size: 12px;
    }
}

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

.btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    padding: 14px 14px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--btn-bg);
    color: var(--fg);
    text-decoration: none;
    font-weight: 700;
    transition: transform .08s ease, background .15s ease, border-color .15s ease;
}

.btn:hover {
    background: var(--btn-bg-hover);
    border-color: color-mix(in srgb, var(--border) 70%, var(--fg) 30%);
}

.btn:active {
    transform: translateY(1px);
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--ring);
}

.meta {
    margin-top: 14px;
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    user-select: none;
}

.subtext {
    padding: 0.4rem;
    color: var(--muted);
    font-size: 12px;
}

.icon {
    width: 22px;
    height: 22px;
    flex: 0 0 22px;
    opacity: .9;
}

.arrow {
    opacity: .65;
    font-weight: 900;
}