:root {
    color-scheme: light;
    --ink: #182b3d;
    --muted: #4a6071;
    --paper: #eef6f8;
    --panel: #f3f8f9;
    --line: #547389;
    --accent: #265d82;
}

* { box-sizing: border-box; }

html, body {
    width: 100%;
    min-height: 100%;
    margin: 0;
}

body {
    overflow: hidden;
    background: #b9d9ed;
    color: var(--ink);
    font-family: "Courier New", monospace;
}

body.dark-mode {
    color-scheme: dark;
    --ink: #edf3f5;
    --muted: #bdced7;
    --paper: #1d2e3d;
    --panel: #243747;
    --line: #8ba8b9;
    --accent: #a9d9ef;
    background: #111d2a;
}

button { font: inherit; cursor: pointer; }
button:focus-visible, a:focus-visible, canvas:focus-visible {
    outline: 3px solid #d48439;
    outline-offset: 3px;
}

.hidden { display: none; }

.no-script {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: grid;
    place-content: center;
    gap: 12px;
    padding: 24px;
    background: #e6f3fa;
    color: #182b3d;
    text-align: center;
}
.no-script a { color: #265d82; }

#welcome-screen {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: grid;
    place-items: center;
    overflow-y: auto;
    padding: 70px 22px 32px;
    background:
        radial-gradient(circle at 20% 18%, rgba(255,255,255,.56) 0 2px, transparent 3px),
        radial-gradient(circle at 76% 32%, rgba(255,255,255,.55) 0 2px, transparent 3px),
        linear-gradient(#91bfdc, #d9edf7 78%, #f5fafb);
    transition: opacity .7s ease;
}
body.dark-mode #welcome-screen {
    background:
        radial-gradient(circle at 20% 18%, rgba(255,255,255,.48) 0 2px, transparent 3px),
        radial-gradient(circle at 76% 32%, rgba(255,255,255,.42) 0 2px, transparent 3px),
        linear-gradient(#152738, #304b60 78%, #627d8c);
}
#welcome-screen.hidden {
    display: grid;
    opacity: 0;
    pointer-events: none;
}

#welcome-content {
    transition: opacity .5s ease, transform .7s ease;
}
#welcome-screen.hidden #welcome-content {
    opacity: 0;
    transform: translateY(-14px);
}

#welcome-content {
    width: min(620px, 100%);
    text-align: center;
}
.welcome-penguin {
    display: block;
    width: clamp(96px, 15vw, 142px);
    height: clamp(96px, 15vw, 142px);
    margin: 0 auto 18px;
    object-fit: contain;
    image-rendering: pixelated;
}
.eyebrow {
    margin: 0 0 12px;
    font-size: .9rem;
    font-weight: bold;
    letter-spacing: .28em;
    text-transform: uppercase;
}
#welcome-text {
    margin: 0;
    font-size: clamp(2.25rem, 6vw, 4.4rem);
    font-weight: bold;
    line-height: 1.08;
    letter-spacing: -.055em;
}
.welcome-intro {
    margin: 21px 0 28px;
    color: var(--muted);
    font-size: clamp(.94rem, 1.5vw, 1.08rem);
    line-height: 1.6;
}
#enter-button {
    min-width: 172px;
    min-height: 54px;
    padding: 9px 22px;
    border: 3px solid #162b3c;
    border-radius: 2px;
    background: #244d69;
    box-shadow: 5px 5px 0 #162b3c;
    color: #fff;
    font-size: 1.08rem;
    font-weight: bold;
    transition: transform .12s ease, box-shadow .12s ease;
}
#enter-button:hover {
    transform: translate(2px, 2px);
    box-shadow: 3px 3px 0 #162b3c;
}
#enter-button span { margin-left: 15px; }
.control-guide {
    max-width: 520px;
    margin: 34px auto 0;
    padding-top: 16px;
    border-top: 1px solid rgba(24,43,61,.4);
    color: var(--muted);
    font-size: .78rem;
    line-height: 1.8;
}

.dark-mode-toggle {
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 40;
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 2px solid var(--line);
    border-radius: 2px;
    background: var(--paper);
    color: var(--ink);
}
.dark-mode-toggle:hover { background: var(--panel); }
.theme-icon { font-size: 1.4rem; line-height: 1; }
.theme-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}
body.menu-open .dark-mode-toggle {
    opacity: 0;
    pointer-events: none;
}

#sound-toggle {
    position: fixed;
    bottom: 14px;
    left: 14px;
    z-index: 20;
    display: none;
    place-items: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 2px solid var(--line);
    border-radius: 2px;
    background: var(--paper);
    color: var(--ink);
    font-size: 1.45rem;
}
body.game-started #sound-toggle { display: grid; }
#sound-toggle[hidden], body.menu-open #sound-toggle { display: none; }
#sound-toggle:hover { background: var(--panel); }
#sound-toggle[aria-pressed="false"]::after {
    content: "";
    position: absolute;
    width: 29px;
    height: 2px;
    background: currentColor;
    transform: rotate(-45deg);
}

#game-container {
    position: relative;
    display: none;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    background: #b4d8ed;
    opacity: 0;
    transition: opacity .75s ease;
}
#game-container.visible { opacity: 1; }
#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
}

#block-info {
    position: absolute;
    z-index: 5;
    width: min(300px, calc(100vw - 30px));
    padding: 16px;
    border: 2px solid var(--line);
    border-radius: 2px;
    background: var(--panel);
    color: var(--ink);
}
#block-info h1 { margin: 0 0 8px; font-size: 1.1rem; }
#block-info p { margin: 0; color: var(--muted); font-size: .78rem; line-height: 1.5; }
body.menu-open #block-info { display: none; }

#projects { display: none; }

#snow-container {
    position: fixed;
    inset: 0;
    z-index: 2;
    overflow: hidden;
    pointer-events: none;
}
body.menu-open #snow-container { display: none; }
.snowflake {
    position: absolute;
    top: -12px;
    width: 6px;
    height: 6px;
    background: #fff;
    opacity: .8;
    animation: fall linear infinite;
}
.paused .snowflake { animation-play-state: paused; }
@keyframes fall { to { transform: translateY(110vh); } }

#npc-dialog {
    position: fixed;
    top: clamp(20px, 8vh, 80px);
    left: 50%;
    z-index: 30;
    width: min(540px, calc(100vw - 30px));
    max-height: calc(100dvh - 40px);
    overflow-y: auto;
    padding: 20px;
    border: 3px solid var(--line);
    border-radius: 2px;
    background: var(--panel);
    color: var(--ink);
    transform: translateX(-50%);
}
.dialog-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    font-size: 1.05rem;
    font-weight: bold;
}
#npc-dialog-close {
    width: 34px;
    height: 34px;
    border: 2px solid var(--line);
    border-radius: 2px;
    background: var(--paper);
    color: var(--ink);
    font-size: 1.3rem;
}
#npc-dialog-text {
    margin: 18px 0 20px;
    color: var(--muted);
    font-size: .86rem;
    line-height: 1.6;
}
#npc-dialog-content > button:not(#npc-dialog-close) {
    display: block;
    width: 100%;
    min-height: 42px;
    margin-top: 8px;
    padding: 9px 12px;
    border: 2px solid var(--line);
    border-radius: 2px;
    background: var(--paper);
    color: var(--ink);
    font-size: .82rem;
    font-weight: bold;
    text-align: left;
}
#npc-dialog-content > button:not(#npc-dialog-close):hover { background: var(--panel); }
.dialog-hint { margin: 17px 0 0; color: var(--muted); font-size: .72rem; }

#mobile-controls { display: none; }

@media (max-width: 767px) {
    #welcome-screen { padding: 70px 20px 26px; }
    #welcome-text { font-size: clamp(2.15rem, 11vw, 3.4rem); }
    .control-guide { margin-top: 27px; font-size: .72rem; }
    #sound-toggle { top: 14px; right: 64px; bottom: auto; left: auto; }
    body.game-started #mobile-controls {
        position: fixed;
        right: 12px;
        bottom: max(12px, env(safe-area-inset-bottom));
        left: 12px;
        z-index: 6;
        display: flex;
        align-items: end;
        gap: 7px;
        pointer-events: none;
    }
    #mobile-controls button {
        display: grid;
        place-items: center;
        min-width: 52px;
        height: 52px;
        padding: 0 10px;
        border: 2px solid #a4c1d2;
        border-radius: 2px;
        background: #18374d;
        color: #fff;
        font-size: 1.25rem;
        font-weight: bold;
        pointer-events: auto;
        touch-action: none;
    }
    #mobile-controls button:active { background: #326789; }
    #mobile-controls .hidden, body.menu-open #mobile-controls { display: none; }
    #interact-button { margin-left: auto; font-size: .84rem !important; }
    #interact-character-button {
        position: absolute;
        right: 0;
        bottom: 61px;
        background: #265d82 !important;
        font-size: .84rem !important;
    }
    #npc-dialog { padding: 16px; }
}

@media (max-width: 390px) {
    #mobile-controls button { min-width: 45px; height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
    .snowflake { display: none; }
}