:root {
    --black: #000;
    --white: #fff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    --correct-bg: #edf5ed;
    --correct-border: #1a7a2e;
    --incorrect-bg: #fdeeed;
    --incorrect-border: #c42b2b;

    /* Jamo artboard unit (rect, not square). Uy/Ux ≈ 133.375/60.1875 */
    --u-w: 10px;
    --u-h: calc(var(--u-w) * 133.375 / 60.1875);
}

html,
body {
    width: 100%;
    height: 100%;
    background-color: var(--white);
    box-sizing: border-box;
    overflow: hidden;
    font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, sans-serif;
    touch-action: none;
    -webkit-font-smoothing: antialiased;
    user-select: none;
    -webkit-user-select: none;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    outline: none;
    background-color: inherit;
    color: inherit;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

/* ── Layout ── */

#app {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.main {
    display: flex;
    flex-direction: column;
    justify-content: start;
    align-items: center;
    width: 100%;
    flex: 1 1 auto;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1.25rem 0 2rem 0;
}

/* ── Timer ── */

.timer-display {
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--gray-400);
    text-align: center;
    padding: 1rem;
}

.timer-display.hidden {
    visibility: hidden;
}

.timer-display.paused {
    opacity: 0.4;
}

/* ── Nav ── */

.nav-container {
    display: flex;
    justify-content: center;
    width: 32rem;
}

#title {
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: inherit;
    text-align: center;
}

/* ── Calendar Modal ── */

.calendar-modal {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    margin-top: 0.5rem;
}

.calendar-modal.hidden {
    display: none;
}

.calendar-container {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: 0.75rem 0.5rem;
    min-width: 280px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-weight: 700;
    font-size: 1rem;
    user-select: none;
    -webkit-user-select: none;
}

.calendar-nav-btn {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: black;
    touch-action: manipulation;
    font-size: 0.75rem;
    transition: background-color 0.2s ease;
    user-select: none;
    -webkit-user-select: none;
}

.calendar-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    color: gray;
    margin-bottom: 0.25rem;
    user-select: none;
    -webkit-user-select: none;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 50%;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

.calendar-day:hover:not(.disabled):not(.empty) {
    background-color: rgba(0, 0, 0, 0.1);
}

.calendar-day.available.selected {
    background-color: black;
    color: white;
}

.calendar-day.available:hover {
    color: black;
}

.calendar-day.available {
    color: black;
}

.calendar-day.disabled {
    color: #ccc;
    cursor: not-allowed;
}

.calendar-day.empty {
    cursor: default;
}

/* ── Questions ── */

.container.questions {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    width: 32rem;
}

.question {
    display: flex;
    flex-direction: column;
    align-items: start;
    gap: 1.125rem;
}

.question .def {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
}

.question .type {
    font-size: 1rem;
    font-weight: bold;
    color: var(--gray-400);
    text-align: right;
}

.question .hint {
    font-size: 1rem;
    font-weight: bold;
    transition: color 0.2s;
}

.question .answer {
    display: flex;
    flex-wrap: wrap;
    gap: var(--u-h) var(--u-w);
    align-items: flex-start;
}

/* ── Syllable Grid (jamo unit) — 변동폭 ──
 * 외톨이 4×2 · 쌍자음/겹받침 6×2 · 가로 4×1 · 세로 4×3
 * 초성 쌍자음: 왼쪽 2u 돌출 (.wide)
 * 종성 6×2: 세로 아래 ±1 / 초성 아래는 가로 시작 정렬 후 오른쪽 돌출 (.jong-wide)
 * 프레임은 활성 셀 bounding box만 (빈 칸 없음)
 */

.grid:not(.chips) {
    display: grid;
    gap: 1px;
    width: max-content;
    height: max-content;
}

/* 높이: 종성 없으면 3u, 있으면 5u */
.grid:not(.chips):not(.has-jong) {
    grid-template-rows: repeat(3, var(--u-h));
}
.grid:not(.chips).has-jong {
    grid-template-rows: repeat(5, var(--u-h));
}

/* 폭 — 일반 초성 */
.grid.type-1 { grid-template-columns: repeat(4, var(--u-w)); }
.grid.type-2,
.grid.type-4 { grid-template-columns: repeat(8, var(--u-w)); }
.grid.type-6 { grid-template-columns: repeat(4, var(--u-w)); }
.grid.type-6.jong-wide { grid-template-columns: repeat(6, var(--u-w)); }
.grid.type-7,
.grid.type-9 { grid-template-columns: repeat(8, var(--u-w)); }
.grid.type-7.jong-wide,
.grid.type-9.jong-wide { grid-template-columns: repeat(9, var(--u-w)); }

/* 폭 — 초성 쌍자음 */
.grid.type-11 { grid-template-columns: repeat(6, var(--u-w)); }
.grid.type-12,
.grid.type-14 { grid-template-columns: repeat(10, var(--u-w)); }
.grid.type-16 { grid-template-columns: repeat(6, var(--u-w)); }
.grid.type-16.jong-wide { grid-template-columns: repeat(8, var(--u-w)); }
.grid.type-17,
.grid.type-19 { grid-template-columns: repeat(10, var(--u-w)); }
.grid.type-17.jong-wide,
.grid.type-19.jong-wide { grid-template-columns: repeat(11, var(--u-w)); }

.cell {
    display: flex;
    justify-content: center;
    align-items: center;
    outline: 1px solid var(--black);
    background-color: var(--white);
    cursor: pointer;
    transition: background-color 0.15s, outline-color 0.15s;
    overflow: hidden;
}

.cell .jamo {
    width: 100%;
    height: 100%;
    object-fit: fill;
    pointer-events: none;
    user-select: none;
}

/* ── 셀 배치 (로컬 좌표) ── */
.cell-0 { grid-column: 1 / 5; grid-row: 1 / 3; }   /* 초성 4×2 */
.cell-1 { grid-column: 5 / 9; grid-row: 1 / 4; }   /* 세로 4×3 */
.cell-3 { grid-column: 1 / 5; grid-row: 3 / 4; }   /* 가로 4×1 */
.cell-4 { grid-column: 5 / 9; grid-row: 4 / 6; }   /* 종성 4×2 (세로 아래) */

.type-6 .cell-4,
.type-16 .cell-4 { grid-column: 1 / 5; grid-row: 4 / 6; }

/* 초성 쌍자음 — 왼쪽 2u 돌출 */
.wide .cell-0 { grid-column: 1 / 7; grid-row: 1 / 3; }
.wide .cell-1 { grid-column: 7 / 11; grid-row: 1 / 4; }
.wide .cell-3 { grid-column: 3 / 7; grid-row: 3 / 4; }
.wide .cell-4 { grid-column: 7 / 11; grid-row: 4 / 6; }
.wide.type-16 .cell-4 { grid-column: 3 / 7; grid-row: 4 / 6; }

/* 종성 6×2 — 세로 아래 ±1 */
.jong-wide:not(.wide) .cell-4 { grid-column: 4 / 10; grid-row: 4 / 6; }

/* 종성 6×2 — 초성 아래: 가로 시작 정렬, 오른쪽 돌출 */
.jong-wide.type-6 .cell-4 { grid-column: 1 / 7; grid-row: 4 / 6; }
.wide.jong-wide.type-16 .cell-4 { grid-column: 3 / 9; grid-row: 4 / 6; }

/* 종성 6×2 — 세로 아래 + 초성 쌍자음 */
.wide.jong-wide .cell-4 { grid-column: 6 / 12; grid-row: 4 / 6; }
.wide.jong-wide.type-16 .cell-4 { grid-column: 3 / 9; grid-row: 4 / 6; }

.cell.hovered {
    background-color: var(--gray-200);
}

/* ── Click-to-Place States ── */

.cell.eligible {
    background-color: var(--gray-200);
    cursor: pointer;
}

.cell.eligible:hover {
    background-color: var(--gray-200);
    outline-color: var(--black);
}

/* ── Grading States ── */

.cell.correct {
    background-color: var(--correct-bg);
    cursor: default;
}

.cell.incorrect {
    background-color: var(--incorrect-bg);
    cursor: pointer;
}

.question-correct .hint {
    color: var(--correct-border);
}

.question-incorrect .hint {
    color: var(--incorrect-border);
}

/* ── Bottom Tray ── */

.tray {
    flex: 0 0 auto;
    border-top: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

.tray-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem 0;
    /* max-width: 960px; */
    width: 32rem;
    margin: 0 auto;
}



.grid.chips {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    flex: 1;
    align-items: center;
    height: auto;
    border: none;
    touch-action: none;
    user-select: none;
    min-height: 44px;
}

/* ── Chips ── */

.chip {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--black);
    background-color: var(--white);
    user-select: none;
    -webkit-user-select: none;
    cursor: grab;
    touch-action: none;
    transition: box-shadow 0.1s;
    overflow: hidden;
}

.chip .jamo {
    width: 100%;
    height: 100%;
    object-fit: fill;
    pointer-events: none;
    user-select: none;
}

.chip:hover {
    box-shadow: 2px 2px 0 var(--black);
    transform: translate(-1px, -1px);
}

/* Chip = artboard units */
.chip.ja {
    width: calc(var(--u-w) * 4);
    height: calc(var(--u-h) * 2);
}

.chip.ja.wide {
    width: calc(var(--u-w) * 6);
    height: calc(var(--u-h) * 2);
}

.chip.verMo {
    width: calc(var(--u-w) * 4);
    height: calc(var(--u-h) * 3);
}

.chip.horMo {
    width: calc(var(--u-w) * 4);
    height: calc(var(--u-h) * 1);
}

.chip.selected {
    background-color: var(--gray-900);
    box-shadow: 2px 2px 0 var(--black);
}

.chip.selected .jamo {
    filter: invert(1);
}

.chip.dragging {
    opacity: 0.7;
    pointer-events: none;
    z-index: 1000;
    touch-action: none;
    user-select: none;
    cursor: grabbing;
    box-shadow: 4px 4px 0 var(--black);
    transform: none;
}

/* ── Tray Actions ── */

.btn-grade {
    width: 100%;
    padding: 0.875rem 0;
    background-color: var(--black);
    color: var(--white);
    border: none;
    border-radius: 6rem;
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: normal;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
}

.btn-grade.pop {
    animation: btnPop 0.4s ease-in-out;
}

.btn-grade:disabled {
    opacity: 0.5;
    cursor: default;
}

@keyframes btnPop {
    0%   { transform: scale(0.9); }
    50%  { transform: scale(1.1); }
    100% { transform: scale(1); }
}
/* ── Result Modal ── */

.result-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.result-modal.hidden {
    display: none;
}

.result-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.result-container {
    position: relative;
    background: var(--white);
    padding: 2.5rem 1.25rem 1.5rem 1.25rem;
    min-width: 280px;
    max-width: 90vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    animation: popIn 0.3s ease;
}

@keyframes popIn {
    0%   { transform: scale(0.9); opacity: 0; }
    100% { transform: scale(1);   opacity: 1; }
}

.result-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.125rem;
    color: var(--gray-400);
    cursor: pointer;
    line-height: 1;
    padding: 0.25rem;
    -webkit-tap-highlight-color: transparent;
}

.result-close:hover {
    color: var(--black);
}

.result-title {
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
}

.result-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.result-stat {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.result-stat-label,
.result-stat-value {
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.result-stat-label {
    color: var(--gray-400);
}

.result-share {
    width: 75%;
    height: 50px;
    background-color: var(--black);
    color: var(--white);
    border: none;
    border-radius: 6rem;
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
    transition: opacity 0.15s;
}

.result-share:hover {
    opacity: 0.75;
}

.result-copied {
    font-family: "Pretendard Variable", Pretendard, sans-serif;
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: -1.5rem;
}

.result-copied.hidden {
    display: none;
}

/* ── Footer ── */

.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 0 0 auto;
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    border-top: 1px solid var(--gray-200);
}

.footer a {
    opacity: 0.5;
    transition: opacity 0.15s;
}

.footer a:hover {
    opacity: 1;
}

@font-face {
    font-family: Logo;
    src: url('../fonts/logo.woff') format('woff');
    font-weight: normal;
    font-style: normal;
}

.logo {
    display: inline-flex;
    align-items: center;
    font-family: Logo;
    font-size: 1rem;
}

.logo span:last-child {
    display: none;
}

/* ── Mobile ── */

@media screen and (max-width: 600px) {
    .main {
        padding: 1rem 0 1.5rem 0;
    }

    .nav-container {
        width: 100%;
        padding: 0 1rem;
    }

    .container.questions {
        width: 100%;
        gap: 2rem;
        padding: 0 1rem;
    }

    .question {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .question .answer {
        gap: var(--u-h) var(--u-w);
    }

    .question .hint, .question .type {
        font-size: 0.875rem;
    }

    :root {
        --u-w: 8px;
    }

    .tray-inner {
        width: 100%;
        flex-direction: column;
        justify-content: center;
        padding: 0.75rem;
        gap: 0.75rem;
        align-items: center;
    }

    .footer {
        padding: 0.5rem 1rem;
    }
}

@media screen and (max-width: 899px) {
    .logo span:first-child {
        display: none;
    }
    .logo span:last-child {
        display: inline-block;
    }
}