/* Chess web client. Dark theme matching lixen.com. The board colours and
   piece glyph treatment are fixed (see pieceMap in app.js); everything else is
   open. Styles live here: the host's CSP has style-src 'unsafe-inline', but
   state is expressed through classes and data attributes, never inline style.

   Two layouts share the markup: board beside the panel from 979px up, and
   board over the panel below (the host's embed frame switches its height at
   the same width). Both must fit the host's frame: 30rem tall side by side,
   46rem (capped at 80svh) stacked. */

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

:root {
    /* Host-site palette */
    --bg: #11111b;
    --surface: #1a1b26;
    --surface-2: #20222f;
    --surface-3: #262a3d;
    --line: #2d3148;
    --line-strong: #3b4261;
    --fg: #c0caf5;
    --fg-soft: #a9b1d6;
    --muted: #7982a9;
    --royal: #5f57f5;
    --royal-soft: #38348f;
    --periwinkle: #8ea2ff;
    --blue: #2563eb;
    --blue-deep: #1e40af;
    --white: #ffffff;
    --cyan: #7dcfff;
    --green: #9ece6a;
    --yellow: #e0af68;
    --red: #f7768e;

    /* Board (fixed) */
    --square-light: #f0d9b5;
    --square-dark: #b58863;
    --square-selected: #6a994e;
    --move-from: #5090d3;
    --move-to: #81b3f0;
    --checkmated-king: #8b0000;

    --radius: 8px;
    --radius-sm: 6px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;

    /* Side-by-side sizes: the board edge includes its coordinate margin. It
       grows with the window but never past what is left under the top bar
       (the host's 30rem frame leaves 416px), so the embed keeps a 360px
       board while a full window gets up to 560px. */
    --topbar-height: 2.5rem;
    --board-edge: clamp(360px, min(32vw, calc(100vh - 64px)), 560px);
    --board-pad: clamp(16px, 1.04vw, 20px);
    --panel-width: clamp(280px, 20vw, 380px);
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.4;
    color: var(--fg-soft);
    background: var(--bg);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }

.visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    margin: -1px; padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.hidden { display: none !important; }

.icon {
    width: 1.1em;
    height: 1.1em;
    flex: none;
}

/* --- Frame ----------------------------------------------------------- */

.app {
    height: 100%;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow: hidden;
}

.topbar {
    flex: none;
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 0.75rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--fg);
    font-weight: 600;
    letter-spacing: 0.01em;
}

.brand-mark {
    width: 1.5rem;
    height: 1.5rem;
    flex: none;
}

.health {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding-left: 0.5rem;
    border-left: 1px solid var(--line);
}

.topbar-spacer { flex: 1; }

/* Status dots: colour by data-status. */
.dot {
    display: inline-block;
    width: 0.6rem;
    height: 0.6rem;
    border-radius: 50%;
    background: var(--line-strong);
    flex: none;
    transition: background 0.2s;
}

.dot[data-status="healthy"], .dot[data-status="ok"], .dot[data-status="authenticated"] { background: var(--green); }
.dot[data-status="disabled"], .dot[data-status="anonymous"] { background: var(--yellow); }
.dot[data-status="degraded"], .dot[data-status="error"] { background: var(--red); }
.dot[data-status="unknown"], .dot[data-status="idle"] { background: var(--line-strong); }

/* --- Buttons --------------------------------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 0.8rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.1;
    color: var(--white);
    background: var(--surface-3);
    transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.15s;
    white-space: nowrap;
}

.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn:focus-visible { outline: 2px solid var(--periwinkle); outline-offset: 2px; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary { background: var(--blue); }
.btn-primary:hover:not(:disabled) { background: var(--royal); }

.btn-secondary { background: var(--blue-deep); }
.btn-secondary:hover:not(:disabled) { background: var(--royal); }

.btn-danger { background: var(--red); color: var(--bg); }
.btn-danger:hover:not(:disabled) { filter: brightness(1.1); }

.btn-ghost {
    background: transparent;
    border-color: var(--line);
    color: var(--fg-soft);
}
.btn-ghost:hover:not(:disabled) { border-color: var(--royal); background: rgba(95, 87, 245, 0.15); color: var(--fg); }

.btn-sm { padding: 0.35rem 0.6rem; font-size: 0.85rem; }

.btn-icon {
    padding: 0.3rem;
    background: transparent;
    color: var(--muted);
}
.btn-icon:hover:not(:disabled) { color: var(--fg); background: var(--surface-3); transform: none; }

.btn-block { width: 100%; }

/* Compact tool buttons in a row (export, replay nav). */
.btn-tool {
    flex: 1;
    padding: 0.4rem 0.3rem;
    font-size: 0.78rem;
    background: var(--surface-2);
    border-color: var(--line);
    color: var(--fg-soft);
}
.btn-tool:hover:not(:disabled) { border-color: var(--royal); color: var(--fg); transform: none; }
.btn-tool.done { border-color: var(--green); color: var(--green); }

.btn-nav {
    width: 2.1rem;
    height: 2.1rem;
    padding: 0;
    background: var(--surface-2);
    border-color: var(--line);
    color: var(--fg);
}
.btn-nav:hover:not(:disabled) { border-color: var(--royal); background: var(--surface-3); transform: none; }
.btn-nav .icon { width: 1.2rem; height: 1.2rem; }

.btn-play[aria-pressed="true"] { background: var(--royal); border-color: var(--royal); }
.btn-play .icon-pause { display: none; }
.btn-play[aria-pressed="true"] .icon-play { display: none; }
.btn-play[aria-pressed="true"] .icon-pause { display: block; }

#replay-flip[aria-pressed="true"] { border-color: var(--periwinkle); color: var(--periwinkle); }

#auth-btn[data-status="authenticated"] { color: var(--fg); }

/* --- Workspace ------------------------------------------------------- */

.workspace {
    flex: 1;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(1rem, 2vw, 2rem);
    overflow: hidden;
}

.board-area {
    position: relative;
    flex: none;
    width: var(--board-edge);
    height: var(--board-edge);
    padding: var(--board-pad);
    display: flex;
    align-items: center;
    justify-content: center;
}

.board-wrapper {
    position: relative;
    width: calc(var(--board-edge) - 2 * var(--board-pad));
    height: calc(var(--board-edge) - 2 * var(--board-pad));
}

.coordinates {
    position: absolute;
    display: flex;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 500;
    user-select: none;
    pointer-events: none;
}

.coordinates.files {
    top: -17px;
    left: 0;
    right: 0;
    justify-content: space-around;
    padding: 0 2px;
}

.coordinates.ranks {
    left: -16px;
    top: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: space-around;
    padding: 2px 0;
}

#board {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    border: 3px solid var(--line-strong);
    border-radius: 4px;
    overflow: hidden;
}

.square {
    display: flex;
    justify-content: center;
    align-items: center;
    /* Glyphs scale with the square: 72% of its edge. */
    font-size: calc((var(--board-edge) - 2 * var(--board-pad)) / 8 * 0.72);
    cursor: pointer;
    user-select: none;
    position: relative;
    overflow: hidden;
    line-height: 1;
}

body[data-mode="replay"] .square, .square.inert { cursor: default; }

.square.light { background-color: var(--square-light); }
.square.dark { background-color: var(--square-dark); }
.square.selected { background-color: var(--square-selected) !important; }
.square.last-move-from { background-color: var(--move-from) !important; }
.square.last-move-to { background-color: var(--move-to) !important; }
.square.white-piece { color: var(--white); text-shadow: 1px 1px 2px rgba(0,0,0,0.5); }
.square.black-piece { color: var(--bg); text-shadow: 1px 1px 2px rgba(255,255,255,0.2); }

/* Move feedback: an overlay fades in and out over the square, so the
   square's own colour is never touched. */
.square.flash-green::before, .square.flash-red::before {
    content: '';
    position: absolute;
    inset: 0;
    animation: flashFade 0.4s ease-out;
    pointer-events: none;
}

.square.flash-green::before { background-color: rgba(154, 206, 106, 0.8); }
.square.flash-red::before { background-color: rgba(247, 118, 142, 0.8); }

@keyframes flashFade {
    0% { opacity: 0; }
    50% { opacity: 1; }
    100% { opacity: 0; }
}

.square.mated-king::after {
    content: '';
    position: absolute;
    inset: 4px;
    border: 3px solid var(--red);
    border-radius: 2px;
    pointer-events: none;
    z-index: 1;
}

.square.mated-king.white-piece,
.square.mated-king.black-piece { color: var(--checkmated-king) !important; }

/* Toast: a short message under the board, inside the board area so it never
   moves the layout. */
.toast-host {
    position: absolute;
    left: 0;
    right: 0;
    bottom: -4px;
    display: flex;
    justify-content: center;
    pointer-events: none;
    z-index: 20;
}

.toast {
    max-width: 92%;
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    background: var(--surface-3);
    border: 1px solid var(--line-strong);
    color: var(--fg);
    font-size: 0.82rem;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.2s, transform 0.2s;
    box-shadow: 0 6px 20px rgba(0,0,0,0.4);
}

.toast.show { opacity: 1; transform: none; }
.toast.error { color: var(--red); border-color: rgba(247, 118, 142, 0.5); }
.toast.info { color: var(--cyan); border-color: rgba(125, 207, 255, 0.4); }
.toast.success { color: var(--green); border-color: rgba(158, 206, 106, 0.5); }

/* --- Panel ----------------------------------------------------------- */

.panel {
    flex: none;
    width: var(--panel-width);
    height: var(--board-edge);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}

.pane {
    height: 100%;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

body[data-mode="live"] .pane-replay { display: none; }
body[data-mode="replay"] .pane-live { display: none; }

.turn-strip {
    flex: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 1.8rem;
    padding: 0.3rem 0.6rem;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--fg);
}

.turn-dot {
    width: 0.7rem;
    height: 0.7rem;
    border: 1px solid var(--line-strong);
}

.turn-dot[data-status="white"] { background: var(--white); }
.turn-dot[data-status="black"] { background: var(--bg); }
.turn-dot[data-status="thinking"] { background: var(--yellow); animation: pulse 1.5s infinite; }
.turn-dot[data-status="white-wins"], .turn-dot[data-status="black-wins"] { background: var(--red); }
.turn-dot[data-status="draw"], .turn-dot[data-status="stalemate"] { background: var(--yellow); }
.turn-dot[data-status="stuck"] { background: var(--red); }

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.9); }
}

.turn-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.controls {
    flex: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
}

.controls .btn { padding: 0.5rem 0.3rem; font-size: 0.82rem; }

.moves {
    flex: 1;
    min-height: 0;
    position: relative;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.5rem 0.6rem;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
}

.moves::-webkit-scrollbar { width: 6px; }
.moves::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

.move-grid {
    display: grid;
    grid-template-columns: 2.4rem 1fr 1fr;
    gap: 0.15rem 0.3rem;
    font-family: var(--mono);
    font-size: 0.88rem;
    align-items: stretch;
}

.move-grid:empty { display: none; }
.move-grid:empty + .moves-empty { display: block; }

.moves-empty {
    display: none;
    margin: 0;
    padding: 0.25rem 0.1rem;
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.45;
}

.move-number {
    color: var(--yellow);
    text-align: right;
    font-weight: 600;
    padding: 0.2rem 0.2rem 0.2rem 0;
}

.move, .move-empty {
    display: block;
    width: 100%;
    padding: 0.2rem 0.45rem;
    border: 1px solid transparent;
    border-radius: 4px;
    background: transparent;
    text-align: left;
    font: inherit;
    color: var(--fg);
}

.move-black { color: var(--cyan); }
.move-empty { color: var(--muted); }

.move-grid-replay .move { cursor: pointer; }
.move-grid-replay .move:hover { background: var(--surface-3); }
.move-grid-replay .move:focus-visible { outline: 2px solid var(--periwinkle); outline-offset: -2px; }
.move-grid-replay .move[aria-current="true"] { background: var(--royal); color: var(--white) !important; border-color: var(--royal); }
/* The live list marks the last move quietly. */
.move-grid:not(.move-grid-replay) .move[aria-current="true"] { background: var(--surface-3); border-color: var(--line-strong); }

.toolbar {
    flex: none;
    display: flex;
    gap: 0.35rem;
}

/* --- Replay pane ----------------------------------------------------- */

.replay-head {
    flex: none;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.4rem 0.6rem;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
}

.replay-title-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge {
    display: inline-block;
    padding: 0.05rem 0.45rem;
    border-radius: 999px;
    background: var(--royal-soft);
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.replay-result { color: var(--fg); font-weight: 600; }
.replay-ply { margin-left: auto; color: var(--muted); font-family: var(--mono); font-size: 0.78rem; }

.replay-players {
    color: var(--fg);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.replay-meta {
    color: var(--muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.78rem;
}

.replay-nav {
    flex: none;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.speed {
    margin-left: auto;
    display: flex;
    align-items: center;
}

.speed select {
    height: 2.1rem;
    padding: 0 0.4rem;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    color: var(--fg);
    font-size: 0.8rem;
}

.speed select:focus-visible { outline: 2px solid var(--periwinkle); }

/* --- Modals ---------------------------------------------------------- */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
    padding: 1rem;
}

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

.modal {
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    width: 100%;
    max-width: 400px;
    color: var(--fg-soft);
    /* The overlay is fixed to the IFRAME viewport, so a modal taller than the
       frame scrolls inside itself instead of clipping. */
    max-height: 100%;
    overflow-y: auto;
    overscroll-behavior: contain;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.modal h2 {
    margin: 0 0 0.75rem;
    color: var(--periwinkle);
    text-align: center;
    font-size: 1.2rem;
}

.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.modal-head h2 { margin: 0; text-align: left; }

.form-group { margin-bottom: 0.9rem; }

.form-group label, .form-group .group-label {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--cyan);
    font-size: 0.9rem;
}

.form-group.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.form-group.form-row .group-label { margin: 0; }

.radio-group {
    display: flex;
    gap: 1.25rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0;
    color: var(--fg-soft);
    font-size: 0.9rem;
}

input[type="range"] {
    width: 100%;
    height: 4px;
    background: var(--line-strong);
    border-radius: 2px;
    outline: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--periwinkle);
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--periwinkle);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]:focus-visible { outline: 2px solid var(--periwinkle); outline-offset: 4px; }

.fen-input,
.auth-form input[type="text"],
.auth-form input[type="email"],
.auth-form input[type="password"],
#reset-overlay input[type="password"],
.account-form input[type="password"] {
    width: 100%;
    padding: 0.5rem 0.6rem;
    background: var(--bg);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    color: var(--fg);
    font-size: 0.9rem;
}

.fen-input {
    font-family: var(--mono);
    font-size: 0.82rem;
    resize: none;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.fen-input:focus, .auth-form input:focus, .account-form input:focus, #reset-overlay input:focus {
    outline: none;
    border-color: var(--royal);
}

.modal-buttons {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.1rem;
}

.auth-modal, .account-modal { max-width: 360px; }

.auth-aside {
    margin: 0.9rem 0 0;
    text-align: center;
    font-size: 0.85rem;
}

.auth-help {
    margin: 0 0 0.9rem;
    font-size: 0.85rem;
    line-height: 1.45;
    color: var(--muted);
}

.link-btn {
    padding: 0;
    background: none;
    border: none;
    color: var(--periwinkle);
    text-decoration: underline;
    text-underline-offset: 2px;
    cursor: pointer;
}

.link-btn:hover { color: var(--fg); }
.link-btn:focus-visible { outline: 2px solid var(--periwinkle); outline-offset: 2px; border-radius: 2px; }
.auth-form input[type="password"]#reset-password, .auth-form input[type="password"]#reset-password-2 { width: 100%; }

.auth-tabs {
    display: flex;
    margin-bottom: 0.9rem;
    border-bottom: 1px solid var(--line-strong);
}

.auth-tab {
    flex: 1;
    padding: 0.6rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    color: var(--fg-soft);
    font-size: 0.95rem;
    transition: color 0.2s, border-color 0.2s;
}

.auth-tab:hover { color: var(--periwinkle); }
.auth-tab.active { color: var(--periwinkle); border-bottom-color: var(--periwinkle); }

/* A reserved slot: an empty message keeps its height and is only invisible,
   so a message never moves the form or pushes the buttons out of a short
   frame. */
.modal-message {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 2.3rem;
    margin-bottom: 0.6rem;
    padding: 0.35rem 0.75rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    line-height: 1.3;
    text-align: center;
    visibility: hidden;
}

.modal-message.show { visibility: visible; }
.modal-message.error { background: rgba(247, 118, 142, 0.12); color: var(--red); border-color: rgba(247, 118, 142, 0.4); }
.modal-message.success { background: rgba(158, 206, 106, 0.12); color: var(--green); border-color: rgba(158, 206, 106, 0.4); }

.auth-form input:disabled, .account-form input:disabled, .auth-tab:disabled,
.fen-input:disabled, input[type="range"]:disabled { opacity: 0.5; cursor: not-allowed; }
.radio-group input:disabled + span { opacity: 0.5; }

.account-name { text-align: center; margin: 0.25rem 0; }

.danger-zone {
    margin-top: 1.25rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--line-strong);
}

.danger-zone summary { cursor: pointer; color: var(--red); text-align: center; }
.danger-zone p { margin: 0.75rem 0 0.9rem; font-size: 0.85rem; line-height: 1.4; }
.danger-zone .modal-buttons { margin-top: 0.9rem; }

.confirm-modal { max-width: 320px; }

.promotion-modal { max-width: 320px; }

.promotion-choices {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.promotion-choice {
    width: 56px;
    height: 56px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 36px;
    line-height: 1;
    background: var(--square-light);
    border: 2px solid var(--line-strong);
    border-radius: 6px;
    transition: border-color 0.2s, background 0.2s;
}

.promotion-choice:hover, .promotion-choice:focus-visible {
    outline: none;
    border-color: var(--royal);
    background: var(--square-selected);
}

.promotion-choices.white .promotion-choice { color: var(--white); text-shadow: 1px 1px 2px rgba(0,0,0,0.5); }
.promotion-choices.black .promotion-choice { color: var(--bg); text-shadow: 1px 1px 2px rgba(255,255,255,0.2); }

/* --- My games drawer ------------------------------------------------- */

.games-modal {
    max-width: 580px;
    height: 100%;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    padding: 1rem 1.25rem;
}

.games-filters {
    flex: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
}

.segmented {
    display: inline-flex;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    overflow: hidden;
}

.seg {
    padding: 0.25rem 0.7rem;
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 0.8rem;
}

.seg:hover { color: var(--fg); }
.seg.active { background: var(--royal-soft); color: var(--white); }
.seg:focus-visible { outline: 2px solid var(--periwinkle); outline-offset: -2px; }

.games-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
    padding-right: 0.25rem;
}

.games-section { margin-bottom: 1rem; }
.games-section.hidden { display: none; }

.games-heading {
    margin: 0 0 0.4rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}

.games-note {
    margin: 0 0 0.6rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.games-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.game-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.45rem 0.6rem;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    color: var(--fg-soft);
    text-align: left;
    transition: border-color 0.15s, background 0.15s;
}

.game-row:hover, .game-row:focus-visible {
    outline: none;
    border-color: var(--royal);
    background: var(--surface-3);
}

.game-row.current { border-color: var(--periwinkle); }

.mini-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    width: 72px;
    height: 72px;
    border: 1px solid var(--line-strong);
    border-radius: 3px;
    overflow: hidden;
    flex: none;
}

.mini-board span {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8px;
    line-height: 1;
    user-select: none;
}

.mini-board .light { background: var(--square-light); }
.mini-board .dark { background: var(--square-dark); }
.mini-board .white-piece { color: var(--white); text-shadow: 0 0 1px rgba(0,0,0,0.6); }
.mini-board .black-piece { color: var(--bg); }

.game-info { min-width: 0; display: flex; flex-direction: column; gap: 0.1rem; }

.game-players {
    color: var(--fg);
    font-weight: 500;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.game-outcome { font-size: 0.82rem; }
.game-outcome .pgn-result { font-family: var(--mono); color: var(--yellow); margin-right: 0.35rem; }
.game-outcome.ongoing .pgn-result { color: var(--green); }

.game-when { font-size: 0.78rem; color: var(--muted); }

.game-go {
    color: var(--periwinkle);
    display: flex;
    align-items: center;
}

.games-status {
    margin: 0.4rem 0;
    font-size: 0.85rem;
    color: var(--muted);
    text-align: center;
}

.games-status.error { color: var(--red); }
.games-status:empty { display: none; }

#games-more { margin-top: 0.4rem; }
#games-more.hidden { display: none; }

/* --- Stacked layout (board over panel) -------------------------------- */

@media (min-width: 641px) and (max-width: 978px) {
    :root {
        --panel-width: clamp(360px, 45vw, 440px);
        --panel-height: 230px;
        /* Board edge = the smaller of the width-derived size and the height
           that is left: topbar 40 + gaps 16 + panel 230 + app padding 16 +
           slack 40 = 342. A short frame shrinks the board before anything
           scrolls. */
        --board-edge: max(280px, min(clamp(360px, 45vw, 440px), calc(100vh - 342px)));
        --board-pad: clamp(16px, 2.04vw, 20px);
    }

    body { overflow-y: auto; overflow-x: hidden; scrollbar-gutter: stable; }

    .app { height: auto; min-height: 100%; }

    .workspace {
        flex-direction: column;
        gap: 0.5rem;
        overflow: visible;
    }

    .panel {
        width: var(--panel-width);
        height: var(--panel-height);
    }

    .pane {
        display: grid;
        grid-template-columns: clamp(150px, 18.4vw, 180px) minmax(0, 1fr);
        grid-template-rows: min-content 1fr;
        gap: 0.5rem 0.75rem;
        padding: 0.6rem;
    }

    .pane > * { min-width: 0; }
    .toolbar .btn-tool { min-width: 0; overflow: hidden; }
    /* Four export buttons in the narrow right column: icons only. */
    .pane-replay .toolbar .btn-tool span { display: none; }
    .pane-replay .toolbar .btn-tool .icon { width: 1.2rem; height: 1.2rem; }

    body[data-mode="replay"] .pane-live, body[data-mode="live"] .pane-replay { display: none; }

    .pane-live .turn-strip { grid-column: 1; grid-row: 1; }
    .pane-live .controls {
        grid-column: 1;
        grid-row: 2;
        grid-template-columns: 1fr 1fr;
        grid-template-rows: 1fr 1fr;
        align-self: stretch;
    }
    .pane-live .controls .btn { padding: 0.3rem 0.2rem; font-size: 0.78rem; min-height: 2rem; }
    .pane-live .moves { grid-column: 2; grid-row: 1 / 3; }
    .pane-live .toolbar { grid-column: 2; grid-row: 3; }
    .pane-live { grid-template-rows: min-content 1fr min-content; }
    .pane-live .controls { grid-row: 2 / 4; }

    /* Replay: head, navigation and the exit button down the left; the move
       list with the export row on the right. */
    .pane-replay { grid-template-rows: min-content min-content 1fr min-content; }
    .pane-replay .replay-head { grid-column: 1; grid-row: 1; padding: 0.3rem 0.5rem; }
    .pane-replay .replay-nav {
        grid-column: 1;
        grid-row: 2;
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        gap: 0.25rem;
    }
    .pane-replay .replay-nav .speed { grid-column: 1 / 5; margin: 0; }
    .pane-replay .replay-nav .speed select { width: 100%; }
    .pane-replay #replay-exit { grid-column: 1; grid-row: 3 / 5; align-self: end; padding: 0.35rem; font-size: 0.78rem; }
    .pane-replay .moves { grid-column: 2; grid-row: 1 / 4; }
    .pane-replay .toolbar { grid-column: 2; grid-row: 4; }
    .pane-replay .btn-nav { width: 100%; height: 1.65rem; }
    .pane-replay .btn-nav .icon { width: 1rem; height: 1rem; }
    .pane-replay .speed select { height: 1.65rem; font-size: 0.72rem; padding: 0 0.2rem; }
    .pane-replay .replay-meta { display: none; }
    .pane-replay .replay-title-row { flex-wrap: wrap; gap: 0.2rem 0.4rem; }
    .pane-replay .replay-players { font-size: 0.76rem; }
    .pane-replay .replay-result { font-size: 0.76rem; }

    .move-grid { grid-template-columns: 2rem 1fr 1fr; font-size: 0.84rem; }
    .btn-tool { font-size: 0.74rem; padding: 0.3rem 0.2rem; }
}

/* --- Phone layout: full-width rows, edge to edge ------------------------ */

@media (max-width: 640px) {
    :root {
        /* Reserve under the board: top bar 40 + gap 6 + turn strip 32 +
           controls 36 + move list 96 + toolbar 36 + gaps and padding 26 =
           276. Small viewport units, so the browser's bars never cover the
           panel. The replay pane is taller (head, navigation, export, exit),
           so a replay reserves more and the board gives way on a short
           screen rather than the controls dropping below the fold. */
        --board-edge: max(240px, min(100vw, calc(100svh - 284px)));
        --board-pad: 14px;
        --panel-width: 100%;
        --panel-height: auto;
        --topbar-height: 2.5rem;
    }

    body { overflow-y: auto; overflow-x: hidden; }
    body[data-mode="replay"] { --board-edge: max(240px, min(100vw, calc(100svh - 372px))); }

    /* The app is exactly the viewport, so the panel and its move list shrink
       to fit; only when their minimums do not fit does the page scroll. */
    .app { padding: 0; gap: 6px; height: 100svh; min-height: 100svh; overflow: visible; }

    .topbar {
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-top: none;
        padding: 0 0.6rem;
    }

    .brand-name, #games-btn span, #auth-label { display: none; }
    #games-btn, #auth-btn { padding: 0.35rem 0.55rem; }

    .workspace {
        flex: 1 1 auto;
        min-height: 0;
        flex-direction: column;
        justify-content: flex-start;
        gap: 6px;
        overflow: visible;
    }

    .board-area { flex: none; }

    .board-area { padding: var(--board-pad) 6px 6px 16px; }
    .board-wrapper {
        width: calc(var(--board-edge) - 22px);
        height: calc(var(--board-edge) - 22px);
    }
    .coordinates.ranks { left: -14px; }
    .coordinates.files { top: -15px; }

    .panel {
        display: flex;
        flex-direction: column;
        width: 100%;
        flex: 1 1 auto;
        min-height: 0;
        height: auto;
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-bottom: none;
    }

    .pane, .pane-live, .pane-replay {
        display: flex;
        flex: 1 1 auto;
        flex-direction: column;
        gap: 0.4rem;
        padding: 0.5rem 0.6rem 0.6rem;
        height: auto;
    }

    .pane > * { min-width: 0; }

    .turn-strip { min-height: 2rem; padding: 0.25rem 0.6rem; }

    .pane-live .controls {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: auto;
        gap: 0.35rem;
    }
    .pane-live .controls .btn { padding: 0.5rem 0.2rem; font-size: 0.85rem; min-height: 2.25rem; height: auto; }

    .moves { flex: 1 1 auto; min-height: 96px; }
    .move-grid { grid-template-columns: 2.2rem 1fr 1fr; font-size: 0.9rem; }

    .toolbar .btn-tool { padding: 0.45rem 0.3rem; font-size: 0.82rem; min-width: 0; }

    /* Replay: head, list, navigation, export and exit as rows. */
    .pane-replay .replay-head { padding: 0.35rem 0.6rem; }
    .pane-replay .replay-meta { display: none; }
    .pane-replay .replay-nav {
        display: grid;
        grid-template-columns: repeat(5, 1fr) 1.4fr 1fr;
        gap: 0.3rem;
    }
    .pane-replay .replay-nav .speed { margin: 0; }
    .pane-replay .replay-nav .speed select { width: 100%; }
    .pane-replay .btn-nav { width: 100%; height: 2.2rem; }
    .pane-replay #replay-exit { padding: 0.5rem; font-size: 0.85rem; }

    .games-modal { padding: 0.75rem; }
    .game-row { gap: 0.5rem; padding: 0.4rem; }
    .mini-board { width: 56px; height: 56px; }
    .mini-board span { font-size: 6px; }
    .modal-overlay { padding: 0.5rem; }
}

/* Very narrow phones: icon-only export buttons. */
@media (max-width: 380px) {
    .pane-replay .toolbar .btn-tool span { display: none; }
    .pane-replay .toolbar .btn-tool .icon { width: 1.2rem; height: 1.2rem; }
    .pane-live .controls .btn { font-size: 0.8rem; }
}

/* --- Motion ---------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }
}