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

:root {
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;

    --shell-pad-x: clamp(16px, 4vw, 32px);
    --shell-pad-y: clamp(16px, 3dvh, 28px);
    --shell-max-width: 1120px;
    --panel-max-width: 640px;
    --overlay-margin: clamp(12px, 3vw, 28px);
    --tap-size: 44px;
    --bottom-nav-space: calc(var(--tap-size) + 24px);

    --z-camera: 1000;
    --z-shell: 3000;
    --z-nav: 3100;
    --z-modal: 6000;
    --z-toast: 7000;
    --z-intro: 10000;

    --viewport-height: 100vh;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
}

html {
    width: 100%;
    min-height: 100%;
    background: #000;
    overflow-x: hidden;
}

body {
    width: 100%;
    min-width: 320px;
    min-height: 100vh;
    min-height: var(--viewport-height);
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Noto Sans KR', sans-serif;
    background: #000;
    color: #fff;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body.overlay-open {
    overflow: hidden;
}

button {
    min-width: var(--tap-size);
    min-height: var(--tap-size);
    font: inherit;
}

button:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.9);
    outline-offset: 3px;
}

#app {
    position: relative;
    min-height: 100vh;
    min-height: var(--viewport-height);
    overflow-x: hidden;
}

.app-shell {
    position: relative;
    min-height: 100vh;
    min-height: var(--viewport-height);
    isolation: isolate;
    overflow-x: hidden;
}

.app-background {
    position: fixed;
    inset: 0;
    z-index: -1;
    background: #0a0a0a;
}

.app-header {
    position: fixed;
    inset: calc(var(--safe-top) + var(--shell-pad-y)) calc(var(--safe-right) + var(--shell-pad-x)) auto calc(var(--safe-left) + var(--shell-pad-x));
    z-index: var(--z-shell);
    min-height: var(--tap-size);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.app-brand {
    grid-column: 1;
    min-width: 0;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    pointer-events: auto;
}

.language-toggle {
    grid-column: 3;
    justify-self: end;
    min-height: var(--tap-size);
    display: inline-grid;
    grid-auto-flow: column;
    align-items: center;
    gap: 4px;
    padding: 4px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    pointer-events: auto;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.language-toggle-option {
    min-width: 44px;
    min-height: 36px;
    padding: 0 10px;
    color: rgba(255, 255, 255, 0.78);
    background: transparent;
    border: 0;
    border-radius: 999px;
    font-size: 12px;
    cursor: pointer;
}

.language-toggle-option[aria-disabled="true"] {
    cursor: default;
}

.language-toggle-option.is-active {
    color: #fff;
    background: rgba(255, 255, 255, 0.18);
}

.app-main {
    position: relative;
    min-height: 100vh;
    min-height: var(--viewport-height);
    width: 100%;
    display: grid;
    place-items: stretch;
}

.app-view {
    position: relative;
    width: 100%;
    min-height: 100vh;
    min-height: var(--viewport-height);
    overflow: visible;
}

.app-nav-layer,
.app-overlay-layer,
.app-toast-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
}

.app-nav-layer {
    z-index: var(--z-nav);
    opacity: 0;
    visibility: hidden;
}

.app-overlay-layer {
    z-index: var(--z-modal);
}

.app-toast-layer {
    z-index: var(--z-toast);
    padding: calc(var(--safe-top) + var(--shell-pad-y)) calc(var(--safe-right) + var(--shell-pad-x)) calc(var(--safe-bottom) + var(--shell-pad-y)) calc(var(--safe-left) + var(--shell-pad-x));
}

#app.view-home:not(.intro-visible):not(.overlay-reveal):not(.overlay-camera-error) .app-header,
#app.view-home:not(.intro-visible):not(.overlay-reveal):not(.overlay-camera-error) .app-nav-layer,
#app.view-camera:not(.intro-visible):not(.overlay-reveal):not(.overlay-camera-error) .app-nav-layer,
#app.view-result:not(.intro-visible):not(.overlay-reveal):not(.overlay-camera-error) .app-nav-layer {
    opacity: 1;
    visibility: visible;
}

#app.passcode-visible .app-header,
#app.passcode-visible .app-nav-layer {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

@supports (height: 100svh) {
    :root {
        --viewport-height: 100svh;
    }
}

@supports (height: 100dvh) {
    :root {
        --viewport-height: 100dvh;
    }
}