/* mosaic-reset: uiverse 컴포넌트 공통 전제 (box-sizing + 기본 sans-serif) */
*, *::before, *::after { box-sizing: border-box; }
:where(body) { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }

:root {
    --bg-color: #e5e5ea;
    --blob-1: #ff2a5f;
    --blob-2: #007aff;
    --blob-3: #ff9500;
    --blob-opacity: 0.7;

    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    --glass-highlight: rgba(255, 255, 255, 0.8);
    --glass-caustic: rgba(255, 255, 255, 0.4);
    --reflection-start: rgba(255, 255, 255, 0.6);
    --reflection-end: rgba(255, 255, 255, 0.0);
    --glare-color: rgba(255, 255, 255, 0.5);

    --pill-bg: rgba(255, 255, 255, 0.7);
    --pill-shadow: 0 4px 12px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.05), inset 0 1px 1px rgba(255, 255, 255, 0.8);
    --icon-color: rgba(0, 0, 0, 0.5);
    --icon-active: rgba(0, 0, 0, 0.95);
    --divider: rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-color: #000000;
    --blob-1: #bf5af2;
    --blob-2: #0a84ff;
    --blob-3: #ff375f;
    --blob-opacity: 0.5;

    --glass-bg: rgba(30, 30, 35, 0.45);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-shadow: rgba(0, 0, 0, 0.8);
    --glass-highlight: rgba(255, 255, 255, 0.25);
    --glass-caustic: rgba(255, 255, 255, 0.05);
    --reflection-start: rgba(255, 255, 255, 0.15);
    --reflection-end: rgba(255, 255, 255, 0.0);
    --glare-color: rgba(255, 255, 255, 0.15);

    --pill-bg: rgba(60, 60, 65, 0.8);
    --pill-shadow: 0 4px 12px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.2), inset 0 1px 1px rgba(255, 255, 255, 0.2);
    --icon-color: rgba(255, 255, 255, 0.5);
    --icon-active: #ffffff;
    --divider: rgba(255, 255, 255, 0.15);
}

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

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: transparent;
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
}

.bg-mesh {
    position: absolute;
    inset: 0;
    z-index: -1;
    background: var(--bg-color);
    transition: background 0.8s ease;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: var(--blob-opacity);
    animation: float 20s infinite alternate cubic-bezier(0.45, 0.05, 0.55, 0.95);
    will-change: transform;
    transition: background 0.8s ease, opacity 0.8s ease;
}

.blob-1 {
    width: 50vw;
    height: 50vw;
    top: -10%;
    left: -10%;
    background: var(--blob-1);
    animation-delay: 0s;
}

.blob-2 {
    width: 45vw;
    height: 45vw;
    bottom: -10%;
    right: -10%;
    background: var(--blob-2);
    animation-delay: -5s;
}

.blob-3 {
    width: 35vw;
    height: 35vw;
    top: 30%;
    left: 40%;
    background: var(--blob-3);
    animation-delay: -10s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1) rotate(0deg);
    }
    33% {
        transform: translate(5%, 10%) scale(1.05) rotate(5deg);
    }
    66% {
        transform: translate(-5%, 5%) scale(0.95) rotate(-5deg);
    }
    100% {
        transform: translate(0, -10%) scale(1.1) rotate(0deg);
    }
}

.liquid-nav {
    position: relative;
    display: flex;
    align-items: center;
    padding: 8px;
    border-radius: 99px;

    background: var(--glass-bg);
    backdrop-filter: blur(50px) saturate(200%);
    -webkit-backdrop-filter: blur(50px) saturate(200%);

    box-shadow:
        0 40px 80px -20px var(--glass-shadow),
        0 10px 30px -10px var(--glass-shadow),
        inset 0 2px 3px -1px var(--glass-highlight),
        inset 0 -2px 4px -1px var(--glass-caustic),
        inset 0 0 0 1px var(--glass-border);

    transition: all 0.5s ease;
    z-index: 10;
}

.liquid-nav::before {
    content: '';
    position: absolute;
    top: 1px;
    left: 1px;
    right: 1px;
    height: 46%;
    border-radius: 99px 99px 24px 24px / 99px 99px 12px 12px;
    background: linear-gradient(180deg, var(--reflection-start) 0%, var(--reflection-end) 100%);
    pointer-events: none;
    z-index: 6;
    transition: background 0.5s ease;
}

.liquid-glare-container {
    position: absolute;
    inset: 0;
    border-radius: 99px;
    overflow: hidden;
    pointer-events: none;
    z-index: 5;
}

.liquid-glare {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.3s ease;
    background: radial-gradient(circle 90px at var(--x, 50%) var(--y, 50%), var(--glare-color) 0%, transparent 100%);
    mix-blend-mode: overlay;
}

.liquid-nav:hover .liquid-glare {
    opacity: 1;
}

.nav-items {
    position: relative;
    display: flex;
    gap: 4px;
    z-index: 3;
}

.active-pill {
    position: absolute;
    top: 0;
    left: 0;
    height: 44px;
    background: var(--pill-bg);
    border-radius: 99px;
    box-shadow: var(--pill-shadow);

    transition: transform 0.5s cubic-bezier(0.34, 1.2, 0.64, 1),
        width 0.5s cubic-bezier(0.34, 1.2, 0.64, 1),
        background 0.5s ease, box-shadow 0.5s ease;
    z-index: 1;
}

.nav-btn {
    position: relative;
    background: transparent;
    border: none;
    padding: 0 20px;
    height: 44px;
    border-radius: 99px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    color: var(--icon-color);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.3s ease;
    outline: none;
    z-index: 2;
}

.btn-content {
    display: flex;
    align-items: center;
    gap: 8px;
    pointer-events: none;
    transition: transform 0.2s cubic-bezier(0.32, 0.72, 0, 1);
}

.nav-btn:active .btn-content {
    transform: scale(0.92);
}

.nav-btn.active {
    color: var(--icon-active);
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--divider);
    margin: 0 4px;
    z-index: 3;
    transition: background 0.5s ease;
}

.theme-btn {
    position: relative;
    background: transparent;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    color: var(--icon-color);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    z-index: 3;
    outline: none;
    margin-left: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease;
}

.theme-btn:hover,
.theme-btn:active {
    color: var(--icon-active);
}

.theme-icon-wrapper {
    position: relative;
    width: 20px;
    height: 20px;
    pointer-events: none;
    transition: transform 0.2s cubic-bezier(0.32, 0.72, 0, 1);
}

.theme-btn:active .theme-icon-wrapper {
    transform: scale(0.8);
}

.theme-icon-wrapper svg {
    position: absolute;
    top: 0;
    left: 0;
    transition: transform 0.5s cubic-bezier(0.34, 1.2, 0.64, 1), opacity 0.4s ease;
    stroke-width: 2.2;
}

.sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.moon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

[data-theme="dark"] .sun {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

[data-theme="dark"] .moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}