:root {
    --gfsf-red: #e10600;
    --gfsf-red-deep: #b00000;
    --gfsf-ink: #140c0c;
    --gfsf-muted: #6b5c5c;
    --gfsf-paper: #fff7f5;
    --gfsf-line: rgba(225, 6, 0, 0.18);
    --nav-h: 4rem;
    --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-sans);
    color: var(--gfsf-ink);
    background: var(--gfsf-paper);
    line-height: 1.5;
    font-weight: 500;
    -webkit-font-smoothing: antialiased;
}

body.nav-open { overflow: hidden; }

a { color: inherit; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ----- Navbar ----- */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-h);
    transition: background 0.25s ease, box-shadow 0.25s ease, backdrop-filter 0.25s ease;
}

.site-nav.is-scrolled,
body:not(.page-home) .site-nav {
    background: rgba(255, 247, 245, 0.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--gfsf-line);
}

.page-home .site-nav:not(.is-scrolled) {
    background: transparent;
}

.site-nav-inner {
    max-width: 1120px;
    height: 100%;
    margin: 0 auto;
    padding: 0 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-logo {
    display: inline-flex;
    align-items: baseline;
    gap: 0.35rem;
    text-decoration: none;
    letter-spacing: -0.03em;
}

.site-logo-mark,
.site-logo-sub {
    font-family: var(--font-sans);
    font-weight: 800;
    color: var(--gfsf-red);
    line-height: 1;
    letter-spacing: -0.04em;
}

.site-logo-mark {
    font-size: 1.35rem;
}

.site-logo-sub {
    font-size: 0.85rem;
    letter-spacing: -0.02em;
}

.site-nav-menu {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.site-nav-link {
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 600;
    padding: 0.55rem 0.85rem;
    border-radius: 999px;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.site-nav-link:hover {
    background: rgba(225, 6, 0, 0.08);
    color: var(--gfsf-red);
}

.site-nav-link.is-active {
    color: var(--gfsf-red);
}

.site-nav-cta {
    background: var(--gfsf-red);
    color: #fff !important;
    margin-left: 0.25rem;
    border: 0;
    cursor: pointer;
    font: inherit;
}

.site-nav-logout {
    display: inline;
    margin: 0;
}

.site-nav-cta:hover {
    background: var(--gfsf-red-deep);
    color: #fff !important;
}

.nav-toggle {
    display: none;
    width: 2.5rem;
    height: 2.5rem;
    border: 0;
    background: transparent;
    padding: 0.55rem;
    cursor: pointer;
}

.nav-toggle-bar {
    display: block;
    height: 2px;
    margin: 5px 0;
    background: var(--gfsf-ink);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.page-shell {
    max-width: 480px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

.page-shell-wide {
    max-width: 1120px;
}

.page-shell h1 {
    font-family: var(--font-sans);
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin: 0 0 1rem;
    color: var(--gfsf-red);
}

@media (max-width: 760px) {
    .nav-toggle { display: block; }

    .site-nav-menu {
        position: fixed;
        inset: var(--nav-h) 0 auto 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding: 1rem 1.25rem 1.5rem;
        background: rgba(255, 247, 245, 0.98);
        border-bottom: 1px solid var(--gfsf-line);
        box-shadow: 0 12px 30px rgba(20, 12, 12, 0.08);
    }

    .site-nav-menu.is-open { display: flex; }

    .site-nav-link {
        padding: 0.9rem 1rem;
        border-radius: 0.75rem;
    }

    .site-nav-cta { margin-left: 0; text-align: center; }
}

/* ----- Common dialog (alert/confirm 대체) ----- */
body.dialog-open {
    overflow: hidden;
}

.gfsf-dialog[hidden] {
    display: none !important;
}

.gfsf-dialog {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: grid;
    place-items: center;
    padding: 1.25rem;
}

.gfsf-dialog-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(20, 12, 12, 0.45);
}

.gfsf-dialog-panel {
    position: relative;
    z-index: 1;
    width: min(100%, 26rem);
    max-width: calc(100vw - 2.5rem);
    max-height: min(80vh, 32rem);
    overflow-x: hidden;
    overflow-y: auto;
    background: #ffffff;
    border: 2px solid var(--gfsf-red);
    padding: 1.35rem 1.35rem 1.2rem;
    box-shadow: 0 18px 40px rgba(20, 12, 12, 0.18);
    animation: gfsf-dialog-in 0.22s cubic-bezier(0.22, 1, 0.36, 1);
    box-sizing: border-box;
}

.gfsf-dialog-kicker {
    margin: 0 0 0.35rem;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--gfsf-red);
}

.gfsf-dialog-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--gfsf-ink);
    line-height: 1.25;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.gfsf-dialog-message {
    margin: 0.75rem 0 0;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gfsf-muted);
    line-height: 1.55;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
    max-width: 100%;
}

.gfsf-dialog-actions {
    margin-top: 1.35rem;
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.gfsf-btn {
    appearance: none;
    border: 2px solid transparent;
    font: inherit;
    font-weight: 700;
    padding: 0.55rem 1rem;
    cursor: pointer;
    letter-spacing: -0.02em;
}

.gfsf-btn-primary {
    background: var(--gfsf-red);
    border-color: var(--gfsf-red);
    color: #ffffff;
}

.gfsf-btn-primary:hover,
.gfsf-btn-primary:focus-visible {
    background: var(--gfsf-red-deep);
    border-color: var(--gfsf-red-deep);
    outline: none;
}

.gfsf-btn-ghost {
    background: #ffffff;
    border-color: var(--gfsf-red);
    color: var(--gfsf-red);
}

.gfsf-btn-ghost:hover,
.gfsf-btn-ghost:focus-visible {
    background: rgba(225, 6, 0, 0.06);
    outline: none;
}

@keyframes gfsf-dialog-in {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (prefers-reduced-motion: reduce) {
    .gfsf-dialog-panel {
        animation: none;
    }
}