/* ============== Global styles ============== */
:root {
    --bg-color: #1a1a2e;
    --panel-bg: #16213e;
    --card-bg: #1e2a4a;
    --text-color: #e0e0e0;
    --accent-color: #4fc3f7;
    --accent-hover: #29b6f6;
    --black-stone: #1a1a1a;
    --white-stone: #f0f0f0;
    --board-color: #dcb35c;
    --board-line: #2a2000;
    --success: #66bb6a;
    --danger: #ef5350;
    --warning: #ffa726;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC',
                 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
    min-height: 100vh;
}

/* ============== Header ============== */
#header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    background: var(--panel-bg);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

#header h1 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-color);
}

#status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
}

.status-dot.offline {
    background: var(--danger);
}

.status-dot.loading {
    background: var(--warning);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ============== Main content layout ============== */
#main-content {
    display: flex;
    gap: 16px;
    padding: 12px 16px;
    height: calc(100vh - 52px);
    overflow: hidden;
    box-sizing: border-box;
}

/* ============== Board area (board + navigation + winrate) ============== */
#board-area {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    min-width: 0;
    overflow: hidden;
    gap: 6px;
}

#board-container {
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 100%;
    min-height: 0;
    overflow: hidden;
}

#goboard {
    cursor: pointer;
    border-radius: 4px;
    display: block;
    /* touch-action uses the default; zoom is handled by the browser native gestures */
}

/* ============== KaTrain-style navigation bar ============== */
#move-nav {
    flex: 0 0 auto;
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

#nav-buttons {
    display: flex;
    justify-content: center;
    gap: 4px;
}

#nav-buttons button {
    width: 44px;
    height: 34px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

#nav-buttons button:hover {
    background: rgba(79,195,247,0.2);
    border-color: var(--accent-color);
}

#nav-buttons button:active {
    transform: scale(0.94);
    background: rgba(79,195,247,0.35);
}

#nav-slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 4px;
}

#nav-move-num {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-color);
    min-width: 28px;
    text-align: right;
}

#nav-move-total {
    font-size: 0.78rem;
    color: #888;
    min-width: 32px;
}

#nav-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: rgba(255,255,255,0.12);
    outline: none;
    cursor: pointer;
}

#nav-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 4px rgba(0,0,0,0.4);
}

#nav-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    border: none;
    cursor: pointer;
}

/* ============== Winrate bar (below the board) ============== */
#winrate-strip {
    flex: 0 0 auto;
    width: 100%;
    max-width: 600px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
}

.wr-label {
    font-size: 0.82rem;
    font-weight: 600;
    white-space: nowrap;
    min-width: 65px;
}

#wr-black-label { text-align: right; color: #ccc; }
#wr-white-label { text-align: left; color: #999; }

.score-lead-inline {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent-color);
    white-space: nowrap;
    min-width: 50px;
    text-align: right;
}

/* ============== Control panel ============== */
#panel {
    flex: 0 0 320px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    max-height: 100%;
}

/* Wider panel on large screens */
@media (min-width: 1600px) {
    #panel {
        flex: 0 0 380px;
    }

    .panel-section {
        padding: 16px;
    }

    .panel-section h3 {
        font-size: 1rem;
    }

    .setting-row, .mode-btn, .action-buttons button {
        font-size: 0.95rem;
    }

    #nav-buttons button {
        width: 52px;
        height: 38px;
        font-size: 1.1rem;
    }
}

@media (min-width: 2400px) {
    #panel {
        flex: 0 0 460px;
    }

    #main-content {
        gap: 24px;
        padding: 20px 24px;
    }

    .panel-section {
        padding: 20px;
        border-radius: 12px;
    }

    .panel-section h3 {
        font-size: 1.1rem;
    }

    .setting-row, .mode-btn, .action-buttons button {
        font-size: 1.05rem;
    }

    .suggestion-item {
        font-size: 0.95rem;
        padding: 8px 10px;
    }

    #header h1 {
        font-size: 1.6rem;
    }

    #status-indicator {
        font-size: 1rem;
    }

    #nav-buttons button {
        width: 60px;
        height: 42px;
        font-size: 1.2rem;
    }

    #nav-move-num {
        font-size: 1.1rem;
    }

    .wr-label {
        font-size: 0.95rem;
    }
}

.panel-section {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 14px;
}

.panel-section h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============== Info bar ============== */
/* (winrate info moved below the board, #winrate-strip) */

/* Winrate bar */
#winrate-bar-container {
    flex: 1;
    height: 10px;
    background: #444;
    border-radius: 5px;
    overflow: hidden;
}

#winrate-bar-black {
    height: 100%;
    width: 50%;
    background: linear-gradient(90deg, #333 0%, #777 100%);
    border-radius: 5px;
    transition: width 0.5s ease;
}

/* Collapsible settings section */
.section-toggle {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.section-toggle:hover {
    color: #fff;
}

.toggle-icon {
    font-size: 0.7rem;
    transition: transform 0.2s;
}

.section-body.collapsed {
    display: none;
}

.section-body.collapsed + .section-toggle .toggle-icon,
.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

/* ============== Mode buttons ============== */
.mode-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.mode-btn {
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 6px;
    background: transparent;
    color: var(--text-color);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn:hover {
    background: rgba(79,195,247,0.15);
    border-color: var(--accent-color);
}

.mode-btn.active {
    background: rgba(79,195,247,0.25);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* ============== Settings ============== */
.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.setting-row label {
    cursor: pointer;
}

.setting-row select {
    padding: 4px 8px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 0.8rem;
}

.setting-row input[type="checkbox"] {
    margin-right: 6px;
    accent-color: var(--accent-color);
}

/* ============== Action buttons ============== */
.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.position-editor { margin-top:8px; padding:10px; border:1px solid var(--border-color, #555); border-radius:8px; display:flex; flex-wrap:wrap; gap:8px; align-items:center; }
.position-editor label { display:flex; gap:5px; align-items:center; }
.games-modal-content { width:min(680px,94vw); max-height:82vh; }
#games-list { max-height:65vh; overflow:auto; }
.game-row { display:grid; grid-template-columns:1fr auto; gap:10px; padding:12px 4px; border-bottom:1px solid rgba(255,255,255,.12); }
.game-name { font-weight:600; margin-bottom:5px; }
.game-meta { font-size:12px; opacity:.72; }
.game-actions { display:flex; flex-wrap:wrap; gap:5px; align-items:center; }
.game-actions button { padding:6px 9px; }
@media(max-width:600px){ .game-row{grid-template-columns:1fr}.game-actions{justify-content:flex-start} }

.action-buttons button {
    padding: 10px;
    border: none;
    border-radius: 6px;
    background: rgba(79,195,247,0.15);
    color: var(--text-color);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.action-buttons button:hover {
    background: rgba(79,195,247,0.3);
}

.action-buttons button:active {
    transform: scale(0.97);
}

#btn-new-game {
    background: rgba(239,83,80,0.2);
}

#btn-new-game:hover {
    background: rgba(239,83,80,0.35);
}

/* ============== Suggestions list ============== */
#suggestions-list {
    max-height: 240px;
    overflow-y: auto;
}

.suggestion-item {
    display: flex;
    align-items: center;
    padding: 6px 8px;
    margin-bottom: 3px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.82rem;
    transition: background 0.15s, box-shadow 0.15s;
    gap: 6px;
}

.suggestion-item:hover {
    background: rgba(79,195,247,0.12);
}

.suggestion-item.active {
    background: rgba(79,195,247,0.22);
    box-shadow: inset 3px 0 0 var(--accent-color);
}

.suggestion-item .rank-dot {
    min-width: 36px;
    height: 20px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.68rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
    padding: 0 4px;
}

.suggestion-item .move-name {
    width: 36px;
    font-weight: 600;
    flex-shrink: 0;
}

.suggestion-item .score-abs {
    width: 42px;
    text-align: right;
    font-weight: 600;
    flex-shrink: 0;
}

.suggestion-item .wr {
    width: 48px;
    text-align: right;
    color: #aaa;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.suggestion-item .visits-count {
    flex: 1;
    text-align: right;
    color: #777;
    font-size: 0.72rem;
}

.placeholder {
    color: #666;
    font-style: italic;
    font-size: 0.82rem;
}

/* ============== PV display ============== */
#pv-display {
    font-size: 0.82rem;
    line-height: 1.6;
    word-wrap: break-word;
}

#pv-display .pv-move {
    display: inline-block;
    padding: 2px 5px;
    margin: 1px;
    border-radius: 3px;
    background: rgba(255,255,255,0.08);
}

#pv-display .pv-move.black {
    border-left: 2px solid #888;
}

#pv-display .pv-move.white {
    border-left: 2px solid #ccc;
}

/* ============== Scrollbar ============== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.25);
}

/* ============== Responsive - phone/tablet portrait ============== */
@media (max-width: 768px) {
    #main-content {
        flex-direction: column;
        align-items: center;
        padding: 6px;
        gap: 6px;
        height: auto;
        overflow-y: auto;
        overflow-x: hidden;
    }

    #board-area {
        width: 100%;
        height: auto;
        flex: 0 0 auto;
        gap: 4px;
    }

    #board-container {
        width: 100%;
        height: auto;
        flex: 0 0 auto;
    }

    #goboard {
        display: block;
        margin: 0 auto;
    }

    #move-nav {
        max-width: 100%;
    }

    #nav-buttons button {
        width: 42px;
        height: 32px;
        font-size: 0.9rem;
    }

    #winrate-strip {
        max-width: 100%;
        padding: 2px 4px;
    }

    #panel {
        flex: 0 0 auto;
        width: 100%;
        max-height: unset;
    }

    .mode-buttons {
        grid-template-columns: 1fr 1fr 1fr 1fr;
    }

    .action-buttons {
        grid-template-columns: 1fr 1fr 1fr 1fr;
    }

    #header {
        padding: 6px 12px;
    }

    #header h1 {
        font-size: 1.1rem;
    }

    .panel-section {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    .mode-buttons {
        grid-template-columns: 1fr 1fr;
    }

    .action-buttons {
        grid-template-columns: 1fr 1fr;
    }

    #nav-buttons button {
        width: 38px;
        height: 30px;
        font-size: 0.85rem;
    }
}

/* ============== Landscape phone ============== */
@media (max-height: 500px) and (orientation: landscape) {
    #main-content {
        flex-direction: row;
        height: calc(100vh - 40px);
        overflow: hidden;
    }

    #header {
        padding: 4px 12px;
    }

    #header h1 {
        font-size: 1rem;
    }

    #board-area {
        flex: 1 1 auto;
    }

    #move-nav {
        max-width: 400px;
    }

    #panel {
        flex: 0 0 220px;
        overflow-y: auto;
    }
}

/* ============== Loading overlay ============== */
#loading-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    font-size: 1.2rem;
}

#loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.2);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 16px;
}

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

/* ============== Board recognition modal ============== */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.modal-content {
    background: var(--bg-panel);
    border-radius: 12px;
    max-width: 480px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    font-size: 16px;
}

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
}
.modal-close-btn:hover {
    color: #fff;
}

.modal-body {
    padding: 16px;
}

#recognize-loading {
    text-align: center;
    padding: 40px 0;
    font-size: 15px;
    color: var(--text-secondary);
}

.recognize-preview-row {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.recognize-preview-col {
    text-align: center;
}

.preview-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

#recognize-board-canvas {
    background: #dcb35c;
    border-radius: 4px;
    cursor: pointer;
    max-width: 100%;
    /* touch-action uses the default (auto), allowing the browser pinch-zoom gesture */
}

#recognize-info {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin: 8px 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.recognize-hint {
    text-align: center;
    font-size: 12px;
    color: var(--accent-color);
    margin: 6px 0;
}

.recognize-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 12px;
}

.recognize-actions button {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--bg-main);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent-color) !important;
    color: #fff !important;
    border-color: var(--accent-color) !important;
    font-weight: bold;
}

.recognize-color-select {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
}

.recognize-color-select select {
    background: var(--bg-main);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 13px;
}

/* ── Header right (language toggle + auth) ── */
#header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-lang {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.3);
    color: var(--text-color);
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: border-color 0.2s;
}
.btn-lang:hover { border-color: var(--accent-color); color: var(--accent-color); }

.btn-auth {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-auth:hover { background: var(--accent-color); color: #000; }

.btn-auth-out {
    border-color: var(--danger);
    color: var(--danger);
}
.btn-auth-out:hover { background: var(--danger); color: #fff; }

.auth-username {
    font-size: 0.85rem;
    color: var(--accent-color);
    margin-right: 4px;
}
.auth-admin-link { text-decoration: none; }
.auth-admin-link:hover { text-decoration: underline; }

/* ── Auth modal ── */
.auth-modal-content {
    max-width: 340px;
    width: 100%;
}

.auth-tabs {
    display: flex;
    gap: 8px;
}

.auth-tab {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
    padding: 4px 8px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s, color 0.2s;
}
.auth-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 4px 0;
}

.auth-form label {
    font-size: 0.85rem;
    color: var(--text-color);
    margin-bottom: -6px;
}

.auth-form input {
    background: var(--bg-color);
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--text-color);
    border-radius: 4px;
    padding: 8px 10px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}
.auth-form input:focus { border-color: var(--accent-color); }

.auth-form .btn-primary {
    margin-top: 4px;
    padding: 9px;
    font-size: 0.95rem;
}

.auth-error {
    background: rgba(239,83,80,0.15);
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: 4px;
    padding: 6px 10px;
    font-size: 0.85rem;
}