/* gabs.day -- Pixel Abacus */

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

:root {
    --tile-base: #4A90D9;
    --tile-highlight: #7EC8E3;
    --reg-bg: #F0F4F8;
    --rod-gap: #C8D6E5;
    --text-primary: #1B2A4A;
    --accent: #FF6B6B;
    --bg-field: #E8EEF4;
    --watermark: #B8C9DB;
    --tile-size: 32px;
    --reg-height: 120px;
}

html {
    scroll-behavior: auto;
}

body {
    font-family: 'Work Sans', sans-serif;
    font-weight: 400;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-field);
    overflow-x: hidden;
}

/* ===================== LEFT NAV STRIP ===================== */

#reg-nav {
    position: fixed;
    left: 0;
    top: 0;
    width: 48px;
    height: 100vh;
    background: var(--reg-bg);
    border-right: 1px solid var(--rod-gap);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 0;
    gap: 6px;
    z-index: 10;
    overflow-y: auto;
}

.nav-num {
    font-family: 'Share Tech Mono', monospace;
    font-size: 11px;
    color: var(--rod-gap);
    text-decoration: none;
    padding: 4px 0;
    transition: color 0.2s ease;
}

.nav-num.active {
    color: var(--text-primary);
}

.nav-num:hover {
    color: var(--accent);
}

/* ===================== MAIN CONTENT ===================== */

#registers {
    margin-left: 48px;
    padding-top: 0;
}

/* ===================== REGISTER ===================== */

.register {
    height: var(--reg-height);
    background-color: var(--reg-bg);
    margin-bottom: 4px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}

/* ===================== TILE ROW ===================== */

.tile-row {
    display: grid;
    grid-template-columns: repeat(auto-fill, var(--tile-size));
    grid-auto-rows: var(--tile-size);
    gap: 0;
    padding: 0;
    height: 100%;
    align-content: center;
    flex: 1;
    padding-left: 8px;
}

.tile {
    width: var(--tile-size);
    height: var(--tile-size);
    background-color: var(--tile-base);
    border: 1px solid var(--rod-gap);
    opacity: 0;
    animation: slideIn 120ms linear forwards;
}

.tile.highlight {
    background-color: var(--tile-highlight);
}

.tile.ghost {
    background-color: transparent;
    border: 1px dashed var(--rod-gap);
    opacity: 0.5;
}

.tile.ghost.materialized {
    background-color: var(--tile-base);
    border-style: solid;
    opacity: 1;
    transition: background-color 0.3s ease, opacity 0.3s ease, border-style 0s;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-16px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ===================== REG COUNTER ===================== */

.reg-counter {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    color: var(--rod-gap);
}

.reg-counter.accent {
    color: var(--accent);
}

/* ===================== DOMAIN REGISTER ===================== */

.domain-register {
    justify-content: center;
}

.pixel-domain {
    display: flex;
    gap: 4px;
    align-items: center;
}

.pixel-char {
    font-family: 'Chakra Petch', sans-serif;
    font-weight: 600;
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--tile-base);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: inline-block;
    background: var(--tile-base);
    color: var(--reg-bg);
    width: var(--tile-size);
    height: var(--tile-size);
    line-height: var(--tile-size);
    text-align: center;
    font-size: 18px;
    border: 1px solid var(--rod-gap);
}

/* ===================== TEXT REGISTER ===================== */

.text-register {
    height: auto;
    min-height: var(--reg-height);
    padding: 24px 24px 24px 16px;
}

.reg-text-block {
    max-width: 520px;
    position: relative;
    z-index: 2;
}

.reg-text-block h2 {
    font-family: 'Chakra Petch', sans-serif;
    font-weight: 600;
    font-size: clamp(1.2rem, 3vw, 2rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.reg-text-block p {
    font-family: 'Work Sans', sans-serif;
    font-weight: 400;
    font-size: 15px;
    color: var(--text-primary);
    line-height: 1.6;
}

/* ===================== WATERMARK ===================== */

.watermark-char {
    position: absolute;
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 900;
    font-size: clamp(4rem, 12vw, 10rem);
    color: var(--watermark);
    opacity: 0.08;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    z-index: 1;
    line-height: 1;
}

/* ===================== ROD UNDERLINE ===================== */

.rod-underline {
    height: 4px;
    background: transparent;
    position: relative;
    overflow: hidden;
}

.rod-underline::after {
    content: '';
    position: absolute;
    left: 0;
    top: 1px;
    height: 2px;
    width: 0;
    background-color: var(--accent);
    transition: width 0.8s linear;
}

.rod-underline.drawn::after {
    width: 100%;
}

/* ===================== FULL REGISTER ===================== */

.full-register {
    background-color: var(--reg-bg);
}

/* ===================== FOOTER REGISTER ===================== */

.footer-register {
    height: 80px;
    justify-content: center;
    overflow: visible;
}

.footer-text {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 900;
    font-size: 1.1rem;
    color: var(--rod-gap);
    padding-left: 16px;
    opacity: 0.6;
}

/* ===================== RESPONSIVE ===================== */

@media (max-width: 768px) {
    :root {
        --tile-size: 24px;
        --reg-height: 96px;
    }

    #reg-nav {
        width: 24px;
        padding: 8px 0;
    }

    .nav-num {
        font-size: 9px;
    }

    #registers {
        margin-left: 24px;
    }

    .pixel-char {
        width: 24px;
        height: 24px;
        line-height: 24px;
        font-size: 14px;
    }
}