:root {
    --bg-base: #f5f2ec;
    --text-primary: #1a1816;
    --text-secondary: rgba(26, 24, 22, 0.76);
    --text-muted: rgba(26, 24, 22, 0.52);
    --c-go: #3d5a42;
    --c-go-light: #6b8f72;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-primary);
    background: var(--bg-base);
    overflow-x: hidden;
    min-height: 100vh;
    line-height: 1.5;
}

#p5-background {
    position: fixed !important;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10 !important;
    pointer-events: none !important;
    opacity: 0.95;
}

body.ambient-fullscreen #p5-background,
html.ambient-fullscreen #p5-background {
    z-index: 1 !important;
    opacity: 1 !important;
    inset: 0 !important;
    width: 100vw !important;
    height: 100dvh !important;
}

#p5-background canvas {
    width: 100%;
    height: 100%;
}

.nav-home {
    position: fixed;
    top: clamp(20px, 3.5vw, 40px);
    left: clamp(20px, 4.5vw, 60px);
    z-index: 102;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0;
    line-height: 1;
    padding: 6px;
    opacity: 0.85;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-home:hover {
    opacity: 1;
    transform: translateX(-3px);
}

.nav-home::before {
    content: '←';
    font-size: 30px;
    font-weight: 300;
    line-height: 1;
}

.header {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: clamp(48px, 8vw, 96px) 24px clamp(24px, 4vw, 40px);
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.header-brand .title {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(28px, 4.5vw, 48px);
    font-weight: 500;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.lang-btn {
    position: fixed;
    top: clamp(20px, 3.5vw, 40px);
    right: clamp(20px, 4.5vw, 60px);
    z-index: 102;
    background: transparent;
    border: 1px solid rgba(26, 24, 22, 0.25);
    border-radius: 4px;
    padding: 8px 14px;
    font-family: "Inter", sans-serif;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.3s ease, background 0.3s ease;
}

.lang-btn:hover {
    border-color: var(--text-primary);
    background: rgba(26, 24, 22, 0.04);
}

.go-main {
    position: relative;
    z-index: 5;
    max-width: max(840px, calc(var(--go-board-px, 480px) + 96px));
    margin: 0 auto;
    padding: 0 24px clamp(64px, 10vw, 96px);
}

.go-intro {
    text-align: center;
    max-width: 720px;
    margin: 0 auto clamp(48px, 8vw, 72px);
}

.go-intro__role {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(12px, 1.3vw, 15px);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.go-intro__lead,
.go-intro__player,
.go-intro__scale,
.go-intro__story {
    font-family: "Inter", sans-serif;
    font-size: clamp(17px, 1.6vw, 21px);
    font-weight: 300;
    line-height: 1.65;
    color: var(--text-secondary);
}

.go-intro__scale,
.go-intro__story {
    margin-top: 1.4em;
}

.go-kifu {
    margin-bottom: clamp(56px, 9vw, 88px);
}

.go-kifu__title {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(14px, 1.4vw, 16px);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 16px;
}

.go-kifu__lead,
.go-kifu__source,
.go-kifu__details,
.go-kifu__status {
    font-family: "Inter", sans-serif;
    font-weight: 300;
    line-height: 1.6;
    color: var(--text-secondary);
}

.go-kifu__lead {
    text-align: center;
    font-size: clamp(16px, 1.5vw, 19px);
    max-width: 640px;
    margin: 0 auto 28px;
}

.go-kifu__card {
    background: rgba(245, 242, 236, 0.78);
    border: 1px solid rgba(26, 24, 22, 0.12);
    border-radius: 8px;
    padding: clamp(18px, 3vw, 28px);
    box-shadow: 0 10px 36px rgba(26, 24, 22, 0.06);
}

.go-kifu__meta {
    text-align: center;
    margin-bottom: 20px;
}

.go-kifu__players {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 12px 18px;
}

.go-kifu__player {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(16px, 1.6vw, 20px);
    font-weight: 500;
    color: var(--text-primary);
}

.go-kifu__rank {
    display: inline-block;
    margin-left: 6px;
    font-family: "Inter", sans-serif;
    font-size: 0.78em;
    font-weight: 400;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.go-kifu__stone {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
}

.go-kifu__player--black .go-kifu__stone {
    background: #1a1816;
    box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.18);
}

.go-kifu__player--white .go-kifu__stone {
    background: #f7f4ee;
    border: 1px solid rgba(26, 24, 22, 0.45);
    box-shadow: inset 0 -1px 2px rgba(26, 24, 22, 0.08);
}

.go-kifu__vs {
    color: var(--text-muted);
    font-weight: 300;
}

.go-kifu__details,
.go-kifu__source {
    font-size: clamp(13px, 1.2vw, 15px);
    margin-top: 10px;
}

.go-kifu__score {
    margin-top: 16px;
}

.go-kifu__caps {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 10px 18px;
}

.go-kifu__caps-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: "Inter", sans-serif;
    font-size: clamp(13px, 1.2vw, 15px);
    font-weight: 300;
    color: var(--text-secondary);
}

.go-kifu__caps-item::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.go-kifu__caps-item--black::before {
    background: #1a1816;
}

.go-kifu__caps-item--white::before {
    background: #f7f4ee;
    border: 1px solid rgba(26, 24, 22, 0.45);
}

.go-kifu__caps-item strong {
    font-family: "Inter Tight", sans-serif;
    font-size: 1.15em;
    font-weight: 500;
    color: var(--text-primary);
}

.go-kifu__result {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(15px, 1.4vw, 18px);
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--c-go);
}

.go-kifu__notice {
    text-align: center;
    font-family: "Inter", sans-serif;
    font-size: 14px;
    font-weight: 300;
    line-height: 1.55;
    color: var(--text-secondary);
    background: rgba(61, 90, 66, 0.06);
    border: 1px solid rgba(61, 90, 66, 0.16);
    border-radius: 6px;
    padding: 10px 14px;
    margin-bottom: 14px;
}

.go-kifu__notice p {
    margin: 0.35em 0;
}

.go-kifu__status {
    text-align: center;
    font-size: 15px;
    margin-bottom: 12px;
}

.go-kifu__status.is-error {
    color: #8a3a2a;
}

.go-kifu__size {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    max-width: 280px;
    margin: 0 auto 16px;
}

.go-kifu__size-label {
    flex-shrink: 0;
    font-family: "Inter Tight", sans-serif;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.go-kifu__size-slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 2px;
    background: rgba(26, 24, 22, 0.22);
    border-radius: 2px;
    cursor: pointer;
}

.go-kifu__size-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--c-go);
    border: 0;
    cursor: grab;
}

.go-kifu__size-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--c-go);
    border: 0;
    cursor: grab;
}

.go-kifu__board-shell {
    width: min(100%, var(--go-board-px, 480px));
    margin: 0 auto;
}

.go-kifu__board,
.go-kifu__board.wgo-player-main {
    width: 100%;
    height: auto !important;
    max-height: none;
    cursor: pointer;
}

.go-kifu__board canvas {
    cursor: pointer;
}

.go-kifu__board .wgo-player-main,
.go-kifu__board .wgo-player-main-board {
    background: transparent;
    box-shadow: none;
}

.go-kifu__board .wgo-player-control {
    background: transparent;
    border: 0;
    font-family: "Inter", sans-serif;
}

.go-kifu__board .wgo-player-menu {
    z-index: 20;
}

.go-kifu__actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 22px;
}

.go-kifu__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 180px;
    padding: 12px 22px;
    border-radius: 4px;
    border: 1px solid rgba(26, 24, 22, 0.28);
    background: transparent;
    color: var(--text-primary);
    font-family: "Inter", sans-serif;
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.go-kifu__btn:hover:not(:disabled) {
    border-color: var(--c-go);
    background: rgba(61, 90, 66, 0.06);
    transform: translateY(-2px);
}

.go-kifu__btn:disabled {
    opacity: 0.5;
    cursor: wait;
}

.go-kifu__btn--ghost {
    border-color: rgba(26, 24, 22, 0.16);
}

.go-kifu__source {
    text-align: center;
    max-width: 560px;
    margin: 16px auto 0;
}

.go-links {
    text-align: center;
}

.go-links__title {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(14px, 1.4vw, 16px);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: clamp(24px, 4vw, 36px);
}

.go-links__nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.go-link {
    display: inline-block;
    padding: 14px 32px;
    background: transparent;
    border: 1px solid rgba(26, 24, 22, 0.28);
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-primary);
    font-family: "Inter", sans-serif;
    font-size: clamp(15px, 1.4vw, 18px);
    font-weight: 400;
    letter-spacing: 0.04em;
    transition: all 0.3s ease;
    min-width: min(100%, 320px);
}

.go-link:hover {
    border-color: var(--c-go);
    background: rgba(61, 90, 66, 0.06);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(26, 24, 22, 0.08);
}

body.lang-fade {
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

@media (max-width: 600px) {
    .go-kifu__size {
        max-width: 100%;
    }

    .go-link,
    .go-kifu__btn {
        width: 100%;
    }

    .go-kifu__players {
        flex-direction: column;
        gap: 8px;
    }

    .go-kifu__vs {
        display: none;
    }

    .go-kifu__caps {
        flex-direction: column;
        gap: 6px;
    }
}

html.theme-dark .go-kifu__card {
    background: rgba(5, 10, 6, 0.82);
    border-color: rgba(57, 255, 20, 0.22);
}

html.theme-dark .go-intro,
html.theme-dark .go-kifu__title,
html.theme-dark .go-kifu__lead,
html.theme-dark .go-kifu__player,
html.theme-dark .title {
    font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}