/* ============================================
   CSS 변수 & 리셋
   ============================================ */
:root {
    --bg-main: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1a2745;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0b0;
    --gold: #f0d060;
    --gold-dim: #b89a30;
    --accent: #4fc3f7;
    --accent-dim: #0288d1;
    --danger: #ff6b6b;
    --success: #66bb6a;
    --board-light: #f0d9b5;
    --board-dark: #b58863;
    --board-selected: rgba(0, 150, 255, 0.45);
    --board-possible: rgba(0, 0, 0, 0.15);
    --board-capture: rgba(255, 0, 0, 0.35);
    --board-lastmove: rgba(255, 255, 0, 0.25);
    --board-check: rgba(255, 0, 0, 0.55);

    --sq-size: calc((100vh - 80px) / 8);
    --board-size: calc(var(--sq-size) * 8);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.screen { display: none; }
.screen.active { display: block; }

#intro-screen.active {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 24px;
    background:
        radial-gradient(circle at top, rgba(240, 208, 96, 0.12), transparent 34%),
        radial-gradient(circle at bottom right, rgba(79, 195, 247, 0.12), transparent 28%),
        linear-gradient(160deg, #101827 0%, #15213a 45%, #1a1a2e 100%);
}

.intro-shell {
    width: min(1080px, 100%);
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: stretch;
    padding: 32px;
    background: rgba(15, 24, 41, 0.72);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 24px;
    box-shadow: 0 28px 60px rgba(0,0,0,0.28);
    backdrop-filter: blur(8px);
}

.intro-copy-panel,
.intro-visual-panel {
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    backdrop-filter: none;
}

.intro-copy-panel {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.intro-badge {
    display: block;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
    align-items: center;
    padding: 10px 12px;
    border-radius: 999px;
    background: rgba(240, 208, 96, 0.12);
    border: 1px solid rgba(240, 208, 96, 0.24);
    color: var(--gold);
    font-size: 0.9em;
    font-weight: 700;
    letter-spacing: 0.04em;
    white-space: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    text-align: center;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.intro-badge::-webkit-scrollbar {
    display: none;
}

.intro-copy {
    max-width: none;
    position: relative;
    margin-top: 18px;
    padding: 24px 26px;
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(31, 48, 79, 0.96) 0%, rgba(23, 36, 61, 0.98) 100%);
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 20px 40px rgba(0,0,0,0.22);
    font-size: clamp(1.08rem, 0.95vw + 0.82rem, 1.2rem);
    line-height: 1.7;
    color: #d9e4f7;
}

.intro-copy::before {
    content: '';
    position: absolute;
    right: 34px;
    bottom: -10px;
    width: 24px;
    height: 24px;
    background: rgba(23, 36, 61, 0.98);
    border-right: 1px solid rgba(255,255,255,0.12);
    border-bottom: 1px solid rgba(255,255,255,0.12);
    transform: rotate(45deg);
    border-bottom-right-radius: 6px;
}

.intro-actions {
    margin-top: 28px;
}

.modal-btn.intro-start-btn {
    width: 100%;
    height: 100%;
    flex: 1;
    min-height: 96px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    white-space: nowrap;
    font-size: clamp(1.5rem, 1.3vw + 0.9rem, 2rem);
    font-weight: 900;
    letter-spacing: -0.05em;
    line-height: 1;
    box-shadow: 0 12px 24px rgba(240, 208, 96, 0.18);
}

.intro-visual-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(300px, 340px)) minmax(220px, 280px);
    gap: 20px 24px;
    align-items: start;
    justify-content: start;
}

.intro-board-preview {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0;
    width: 100%;
    max-width: 340px;
    aspect-ratio: 1;
    justify-self: start;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 20px 38px rgba(0,0,0,0.24);
}

.intro-board-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
}

.intro-board-cell.light {
    background: #f0d9b5;
}

.intro-board-cell.dark {
    background: #b58863;
}

.intro-board-piece-svg {
    width: 76%;
    height: 76%;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 3px 4px rgba(0, 0, 0, 0.24));
}

.intro-board-piece-svg svg {
    width: 100%;
    height: 100%;
}

.intro-side-stack {
    grid-column: 3;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    align-self: stretch;
    gap: 14px;
    height: 100%;
}

.intro-feature-list {
    display: grid;
    gap: 12px;
    align-content: start;
}

.intro-visual-panel .intro-actions {
    margin-top: 0;
    width: 100%;
    display: flex;
    align-items: stretch;
    justify-content: flex-start;
    flex: 1;
}

.intro-feature {
    min-height: 62px;
    padding: 16px 18px;
    border-radius: 18px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-primary);
    font-size: 0.96em;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 14px 28px rgba(0,0,0,0.16);
}

/* ============================================
   로비 화면
   ============================================ */
.lobby-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px 20px;
}

.lobby-header {
    text-align: center;
    margin-bottom: 30px;
}

.lobby-header .logo {
    font-size: 60px;
    margin-bottom: 10px;
}

.lobby-header h1 {
    font-size: 2.2em;
    color: var(--gold);
    text-shadow: 0 0 20px rgba(240, 208, 96, 0.3);
}

.lobby-header .subtitle {
    color: var(--text-secondary);
    font-size: 0.95em;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.lobby-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.05);
}

.lobby-section h2 {
    font-size: 1.15em;
    margin-bottom: 18px;
    color: var(--gold);
}

.mode-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 10px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s;
    font-size: 0.9em;
}

.mode-btn .mode-icon { font-size: 2em; margin-bottom: 8px; }
.mode-btn .mode-label { font-weight: 600; }
.mode-btn .mode-desc { font-size: 0.8em; margin-top: 4px; opacity: 0.7; }

.mode-btn.active {
    border-color: var(--gold);
    background: rgba(240, 208, 96, 0.08);
    color: var(--gold);
}

.mode-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.local-mode-section {
    margin-top: -4px;
}

.local-mode-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 20px;
    border-radius: 14px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    transition: all 0.25s ease;
}

.local-mode-panel.active {
    border-color: var(--gold);
    background: rgba(240, 208, 96, 0.08);
    box-shadow: inset 0 0 0 1px rgba(240, 208, 96, 0.14);
}

.local-mode-copy {
    min-width: 0;
}

.local-mode-title {
    font-size: 1.02em;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.local-mode-desc {
    margin: 0;
    font-size: 0.88em;
    color: var(--text-secondary);
    line-height: 1.5;
}

.local-mode-btn {
    flex-shrink: 0;
    padding: 12px 18px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.14);
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.local-mode-btn:hover {
    border-color: var(--gold);
    color: var(--gold);
}

.local-mode-btn.active {
    border-color: var(--gold);
    background: rgba(240, 208, 96, 0.12);
    color: var(--gold);
}

/* ★ AI 설정 섹션 */
.ai-settings {
    margin-top: 15px;
    padding: 15px;
    background: rgba(0,0,0,0.2);
    border-radius: 10px;
    display: none;
}

.ai-settings.visible {
    display: block;
}

.ai-settings-step {
    display: none;
}

.ai-settings-step.active {
    display: block;
}

.online-settings {
    margin-top: 15px;
    padding: 15px;
    background: rgba(0,0,0,0.2);
    border-radius: 10px;
    display: none;
}

.online-settings.visible {
    display: block;
}

.online-settings h3 {
    font-size: 0.95em;
    color: var(--accent);
    margin-bottom: 8px;
}

.online-help {
    color: var(--text-secondary);
    font-size: 0.85em;
    margin-bottom: 12px;
    line-height: 1.4;
}

.online-auth-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.online-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 10px;
    border-radius: 999px;
    background: rgba(79, 195, 247, 0.14);
    color: var(--accent);
    font-size: 0.78em;
    border: 1px solid rgba(79, 195, 247, 0.25);
}

.online-pill.secondary {
    background: rgba(255,255,255,0.06);
    color: var(--text-secondary);
    border-color: rgba(255,255,255,0.08);
}

.online-name-row {
    margin-bottom: 12px;
}

.online-name-row label {
    display: block;
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.online-name-row input,
.online-join-row input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    color: var(--text-primary);
    font-size: 0.95em;
}

.online-name-row input:focus,
.online-join-row input:focus {
    outline: none;
    border-color: var(--accent);
}

.online-actions,
.online-join-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 12px;
}

.online-join-row {
    grid-template-columns: minmax(0, 1fr) auto auto;
}

.online-btn {
    padding: 11px 12px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.88em;
    font-weight: 600;
    white-space: nowrap;
}

.online-btn:hover {
    border-color: var(--accent);
    background: rgba(79, 195, 247, 0.08);
}

.online-btn.primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-dim));
    border-color: transparent;
    color: #06141d;
}

.online-btn.active {
    border-color: var(--gold);
    background: rgba(240, 208, 96, 0.12);
    color: var(--gold);
}

.online-btn.danger {
    border-color: rgba(255, 107, 107, 0.35);
    background: rgba(255, 107, 107, 0.12);
    color: #ffb3b3;
}

.online-btn.ghost {
    background: transparent;
}

.online-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.online-room-box {
    padding: 12px;
    border-radius: 12px;
    background: rgba(240, 208, 96, 0.08);
    border: 1px solid rgba(240, 208, 96, 0.16);
    margin-bottom: 12px;
}

.online-room-label {
    color: var(--text-secondary);
    font-size: 0.8em;
    margin-bottom: 6px;
}

.online-room-code {
    color: var(--gold);
    font-size: 1.4em;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.online-room-actions {
    margin-top: 10px;
    display: flex;
    justify-content: flex-end;
}

.online-status-text {
    min-height: 20px;
    color: var(--text-secondary);
    font-size: 0.85em;
    line-height: 1.4;
}

.step-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 18px;
}

.time-settings-panel {
    margin-top: 14px;
}

.time-panel-heading {
    margin-bottom: 12px;
    font-size: 0.98em;
    color: var(--gold);
}

.time-panel-title {
    margin: 18px 0 12px;
    font-size: 0.95em;
    color: var(--text-secondary);
}

.ai-settings h3 {
    font-size: 0.95em;
    color: var(--accent);
    margin-bottom: 12px;
}

.ai-color-select {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.ai-color-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-size: 0.9em;
}

.ai-color-btn.active {
    border-color: var(--gold);
    background: rgba(240, 208, 96, 0.1);
    color: var(--gold);
}

.ai-color-btn:hover {
    border-color: var(--accent);
}

.ai-level-select {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 14px;
    background: rgba(0,0,0,0.16);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 12px;
}

.ai-level-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.ai-level-value {
    font-size: 1.4em;
    font-weight: 700;
    color: var(--gold);
    line-height: 1;
}

.ai-level-caption,
.ai-level-max {
    font-size: 0.78em;
    color: var(--text-secondary);
}

.ai-level-controls {
    display: grid;
    grid-template-columns: 44px 1fr 44px;
    gap: 10px;
    align-items: center;
}

.ai-level-step {
    width: 44px;
    height: 44px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-size: 1.3em;
    font-weight: 700;
}

.ai-level-step:hover {
    border-color: var(--accent);
    background: rgba(79, 195, 247, 0.08);
}

.ai-level-range {
    width: 100%;
    accent-color: var(--gold);
    cursor: pointer;
}

.ai-level-range:focus {
    outline: none;
}

.ai-level-select.active {
    border-color: var(--gold);
    background: rgba(240, 208, 96, 0.1);
}

.ai-level-scale {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75em;
    color: var(--text-secondary);
}

/* ★ AI 상태 표시 */
.ai-thinking-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 36px;
    padding: 6px 14px;
    background: rgba(79, 195, 247, 0.1);
    border: 1px solid rgba(79, 195, 247, 0.3);
    border-radius: 8px;
    font-size: 0.85em;
    color: var(--accent);
    margin-top: 6px;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.15s ease;
    pointer-events: none;
}

.ai-thinking-indicator.visible {
    visibility: visible;
    opacity: 1;
}

.ai-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(79, 195, 247, 0.3);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 시간 프리셋 */
.time-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.preset-btn {
    padding: 14px 8px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-size: 0.9em;
}

.preset-btn:hover { border-color: var(--accent); background: rgba(79, 195, 247, 0.08); }
.preset-btn.active { border-color: var(--gold); background: rgba(240, 208, 96, 0.1); color: var(--gold); }
.preset-btn .time-value { font-size: 1.3em; font-weight: 700; display: block; }
.preset-btn .time-label { font-size: 0.75em; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }

.custom-time {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    padding: 15px;
    background: rgba(0,0,0,0.2);
    border-radius: 10px;
    margin-bottom: 15px;
}

.time-input-group { text-align: center; }
.time-input-group label { display: block; font-size: 0.85em; color: var(--text-secondary); margin-bottom: 8px; }

.time-adjuster {
    display: flex;
    align-items: center;
    gap: 8px;
}

.time-adjuster button {
    width: 36px;
    height: 36px;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-size: 1.2em;
    cursor: pointer;
    transition: all 0.2s;
}

.time-adjuster button:hover { background: rgba(255,255,255,0.15); }

.time-adjuster input {
    width: 55px;
    height: 36px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    color: var(--text-primary);
    font-size: 1.1em;
    font-weight: 600;
}

.time-summary {
    text-align: center;
    padding: 10px;
    background: rgba(240, 208, 96, 0.08);
    border-radius: 8px;
    color: var(--gold);
    font-size: 0.9em;
}

.player-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.player-input-group label {
    display: block;
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.player-input-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    color: var(--text-primary);
    font-size: 0.95em;
}

.player-input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.start-btn {
    display: block;
    width: 100%;
    padding: 16px;
    margin-top: 20px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--gold), var(--gold-dim));
    color: #1a1a2e;
    font-size: 1.2em;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    letter-spacing: 1px;
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(240, 208, 96, 0.3);
}

/* ★ 엔진 로딩 오버레이 */
.engine-loading-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.8);
    z-index: 200;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 20px;
    backdrop-filter: blur(4px);
}

.engine-loading-overlay.active {
    display: flex;
}

.engine-loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(79, 195, 247, 0.3);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.engine-loading-text {
    color: var(--accent);
    font-size: 1.1em;
    text-align: center;
}

/* ============================================
   게임 화면
   ============================================ */
#game-screen.active {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
}

.game-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 25px;
    padding: 16px 20px 18px;
    max-width: 100%;
    width: 100%;
    height: 100%;
}

.board-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    flex-shrink: 0;
    width: calc(var(--board-size) + 36px);
}

.board-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 4px;
}

.board-labels-file {
    display: flex;
    justify-content: space-around;
    width: var(--board-size);
    margin-left: 28px;
    padding: 2px 0;
    color: var(--text-secondary);
    font-size: 0.85em;
    font-weight: 600;
}

.board-labels-rank {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    height: var(--board-size);
    padding: 0 5px;
    color: var(--text-secondary);
    font-size: 0.85em;
    font-weight: 600;
}

#chessboard {
    display: grid;
    grid-template-columns: repeat(8, var(--sq-size));
    grid-template-rows: repeat(8, var(--sq-size));
    border: 3px solid rgba(255,255,255,0.15);
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.square {
    width: var(--sq-size);
    height: var(--sq-size);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: background-color 0.15s;
    user-select: none;
}

.square.light { background-color: var(--board-light); }
.square.dark { background-color: var(--board-dark); }
.square.selected { background-color: var(--board-selected) !important; }
.square.last-move { background-color: var(--board-lastmove) !important; }
.square.check { background-color: var(--board-check) !important; }
.square.premove-from {
    box-shadow: inset 0 0 0 3px rgba(95, 227, 161, 0.55);
}
.square.premove-to::before {
    content: '';
    position: absolute;
    inset: 10%;
    border: 3px dashed rgba(95, 227, 161, 0.9);
    border-radius: 50%;
}

.square.possible-move::after {
    content: '';
    position: absolute;
    width: 26%;
    height: 26%;
    background: var(--board-possible);
    border-radius: 50%;
}

.square.capture-move::after {
    content: '';
    position: absolute;
    width: 88%;
    height: 88%;
    border: 4px solid var(--board-capture);
    border-radius: 50%;
}

.piece-svg {
    width: 85%;
    height: 85%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    filter: drop-shadow(1px 2px 2px rgba(0, 0, 0, 0.35));
    transition: transform 0.15s ease;
}

.piece-svg svg { width: 100%; height: 100%; }

.piece-svg.draggable-piece {
    pointer-events: auto;
    cursor: grab;
}

.piece-svg.dragging {
    opacity: 0.35;
    cursor: grabbing;
}

.drag-ghost {
    position: fixed;
    width: calc(var(--sq-size) * 0.85);
    height: calc(var(--sq-size) * 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 200;
    filter: drop-shadow(0 8px 14px rgba(0, 0, 0, 0.42));
}

.drag-ghost svg {
    width: 100%;
    height: 100%;
}

.square:hover .piece-svg { transform: scale(1.08); }

.square.selected .piece-svg {
    transform: scale(1.12);
    filter: drop-shadow(0 0 8px rgba(0, 150, 255, 0.6)) drop-shadow(1px 2px 3px rgba(0, 0, 0, 0.4));
}

.square.drag-over {
    box-shadow: inset 0 0 0 3px rgba(79, 195, 247, 0.9);
}

.status-bar {
    display: none !important;
    margin-top: 8px;
    padding: 6px 20px;
    background: var(--bg-card);
    border-radius: 8px;
    font-size: 0.95em;
    text-align: center;
    width: 100%;
    min-height: 38px;
    align-items: center;
    justify-content: center;
}

#status {
    display: block;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.side-panel {
    width: 300px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    height: calc(var(--board-size) + 50px);
    max-height: calc(100vh - 40px);
    flex-shrink: 0;
}

.player-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
    flex-shrink: 0;
}

.player-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3em;
    font-weight: 700;
}

.player-avatar.white-avatar { background: #fff; color: #333; }
.player-avatar.black-avatar { background: #333; color: #fff; }

.player-info {
    flex: 1;
    min-width: 0;
}

.player-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 2px;
}

.player-side-label {
    font-size: 0.78em;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
}

.player-identity {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.player-name {
    font-weight: 600;
    font-size: 0.98em;
    line-height: 1.25;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-timer {
    display: inline-block;
    min-width: 5ch;
    font-size: 1.5em;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    text-align: right;
}

.player-timer.low-time { color: var(--danger); animation: pulse 1s infinite; }
.player-timer.no-limit { font-size: 1.6em; color: var(--text-secondary); }

.increment-badge {
    font-size: 0.7em;
    color: var(--success);
    margin-left: 4px;
}

.turn-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.15);
    display: inline-block;
}

.turn-indicator.active { background: var(--success); box-shadow: 0 0 8px var(--success); }

.captured-pieces {
    min-height: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    margin-top: 4px;
}

.captured-piece-svg {
    display: inline-block;
    width: 22px;
    height: 22px;
    vertical-align: middle;
    margin: 0 1px;
}

.captured-piece-svg svg { width: 100%; height: 100%; }

.move-history {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 14px;
    border: 1px solid rgba(255,255,255,0.05);
    flex: 1;
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.move-history h3 {
    font-size: 0.9em;
    color: var(--text-secondary);
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

#move-list {
    flex: 1;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    scrollbar-gutter: stable;
}

#move-list::-webkit-scrollbar { width: 4px; }
#move-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

.move-entry {
    display: grid;
    grid-template-columns: 35px 1fr 1fr;
    padding: 3px 6px;
    border-radius: 4px;
    gap: 4px;
}

.move-entry:nth-child(odd) { background: rgba(255,255,255,0.02); }
.move-number { color: var(--text-secondary); font-size: 0.85em; }
.move-white, .move-black {
    padding: 2px 6px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-height: 38px;
}

.move-notation {
    color: var(--text-primary);
    line-height: 1.2;
}

.move-time {
    color: var(--text-secondary);
    font-size: 0.72em;
    line-height: 1.1;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    flex-shrink: 0;
}

.ctrl-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85em;
    text-align: center;
}

.ctrl-btn:hover { background: var(--bg-card-hover); border-color: var(--accent); }
.ctrl-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    border-color: rgba(255,255,255,0.08);
    color: var(--text-secondary);
}
.ctrl-btn:disabled:hover { background: var(--bg-card); border-color: rgba(255,255,255,0.08); }
.ctrl-btn.danger:hover { border-color: var(--danger); color: var(--danger); }

.control-note {
    min-height: 20px;
    margin-top: -2px;
    font-size: 0.8em;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ============================================
   모달
   ============================================ */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    z-index: 100;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal-overlay.active { display: flex; }

.modal-content {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 35px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    min-width: 320px;
}

.pgn-modal-content {
    width: min(92vw, 760px);
    text-align: left;
}

.pgn-textarea {
    width: 100%;
    min-height: 280px;
    resize: vertical;
    padding: 14px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 12px;
    background: rgba(0,0,0,0.2);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.92em;
    line-height: 1.5;
    margin-bottom: 18px;
}

.pgn-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(255,255,255,0.05);
}

.modal-content h2 {
    font-size: 1.6em;
    margin-bottom: 10px;
    color: var(--gold);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 25px;
    font-size: 1.05em;
}

.modal-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.modal-btn {
    padding: 12px 28px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.modal-btn.primary {
    background: linear-gradient(135deg, var(--gold), var(--gold-dim));
    color: #1a1a2e;
}

.modal-btn.danger {
    background: linear-gradient(135deg, #ff7b72, #e55353);
    color: #fff;
}

.modal-btn.secondary {
    background: rgba(255,255,255,0.1);
    color: var(--text-primary);
}

.modal-btn:hover { transform: translateY(-2px); }
.modal-btn:disabled {
    opacity: 0.6;
    cursor: wait;
    transform: none;
}

.resign-modal {
    width: min(calc(100vw - 24px), 420px);
}

.local-player-modal {
    width: min(calc(100vw - 24px), 460px);
    transform: scale(0.85);
    transform-origin: center center;
}

.online-time-modal {
    width: min(calc(100vw - 24px), 520px);
    transform: scale(0.85);
    transform-origin: center center;
}

.local-player-form {
    display: grid;
    gap: 14px;
    margin-bottom: 24px;
    text-align: left;
}

.local-player-input-group label {
    display: block;
    margin-bottom: 7px;
    font-size: 0.9em;
    color: var(--text-secondary);
}

.local-player-input-group input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: 10px;
    background: rgba(0,0,0,0.24);
    color: var(--text-primary);
    font-size: 0.98em;
}

.local-player-input-group input:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(240, 208, 96, 0.08);
}

.modal-inline-error {
    display: none;
    margin: -10px 0 18px;
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(255, 107, 107, 0.12);
    border: 1px solid rgba(255, 107, 107, 0.28);
    color: #ffc9c9;
    font-size: 0.92em;
    line-height: 1.45;
    text-align: left;
}

.modal-inline-error.visible {
    display: block;
}

#promotion-choices {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 15px;
}

.promo-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border: 2px solid #555;
    border-radius: 15px;
    background: var(--bg-card);
    cursor: pointer;
    transition: all 0.2s;
}

.promo-btn:hover {
    border-color: var(--gold);
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
}

.promo-svg {
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.promo-svg svg { width: 100%; height: 100%; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@media (max-height: 700px) {
    :root {
        --sq-size: calc((100vh - 60px) / 8);
    }
}

@media (max-width: 1000px) {
    .intro-shell { padding: 28px 24px; }

    .intro-visual-panel {
        grid-template-columns: repeat(2, minmax(220px, 1fr));
    }

    .intro-side-stack {
        grid-column: 1 / -1;
    }

    .intro-visual-panel .intro-actions {
        justify-content: center;
    }

    .intro-board-preview,
    .intro-visual-panel .intro-actions {
        margin: 0 auto;
    }

    .game-container {
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        gap: 10px;
        padding: 1px 10px 10px;
    }
    
    :root {
        --sq-size: calc(min(
            (100vh - 280px) / 8,
            (100vw - 60px) / 8
        ));
    }
    
    .side-panel {
        width: 100%;
        max-width: calc(var(--board-size) + 60px);
        height: auto;
        max-height: none;
    }
    
    .move-history {
        max-height: 150px;
    }

    .online-actions,
    .online-join-row {
        grid-template-columns: 1fr;
    }
    
    #game-screen.active {
        height: auto;
        min-height: 100vh;
        overflow-y: auto;
    }
}

@media (max-width: 500px) {
    #intro-screen.active {
        padding: 14px;
    }

    .intro-shell {
        border-radius: 18px;
        padding: 22px 16px;
    }

    .intro-visual-panel {
        grid-template-columns: 1fr;
    }

    .intro-board-preview {
        max-width: 100%;
    }

    :root {
        --sq-size: calc((100vw - 50px) / 8);
    }
    
    .lobby-container { padding: 15px 10px; }
    .mode-grid { grid-template-columns: 1fr; }
    .local-mode-panel {
        flex-direction: column;
        align-items: stretch;
    }
    .time-presets { grid-template-columns: repeat(3, 1fr); }
    .player-inputs { grid-template-columns: 1fr; }
    .ai-level-controls { grid-template-columns: 40px 1fr 40px; }
    .ai-level-step { width: 40px; height: 40px; }
    .online-auth-row { flex-direction: column; }
    
    .side-panel { width: 100%; }
    
    .player-timer { font-size: 1.2em; }
    .ctrl-btn { font-size: 0.8em; padding: 8px; }
    .modal-content { padding: 24px 18px; min-width: 0; width: calc(100vw - 24px); }
    .pgn-textarea { min-height: 220px; }
}