/**
 * Grandmaster Chess Arena Pro - Master Stylesheet
 * Advanced CSS Variables, Multiple Dynamic Board Themes, Responsive Glassmorphism
 */

:root {
    --bg-main: #080d17;
    --bg-card: #111b2b;
    --bg-card-hover: #16243a;
    --border-color: #263449;
    --border-highlight: #3b506e;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-gold: #d8ae65;
    --accent-gold-hover: #f0c984;
    --accent-green: #38d996;
    --accent-red: #f43f5e;
    --accent-cyan: #38bdf8;
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* BOARD THEME DEFAULT (WOOD MASTER) */
    --sq-light: #eedbc2;
    --sq-dark: #8d5b3d;
    --sq-selected: #f7d252;
    --sq-last-move: #c7a740;
    --sq-in-check: #ef4444;
    --sq-legal-dot: rgba(26, 40, 30, 0.45);
    --sq-capture-ring: rgba(220, 38, 38, 0.6);
    --board-border: #263449;
    --eval-white: #ffffff;
    --eval-black: #18202c;
}

/* THEME EMERALD CLASSIC */
body.theme-emerald {
    --sq-light: #ebecd0;
    --sq-dark: #739552;
    --sq-selected: #f7e657;
    --sq-last-move: #baca44;
    --board-border: #1e3321;
}

/* THEME CYBERPUNK NEON */
body.theme-cyber {
    --bg-main: #060913;
    --bg-card: #0b1329;
    --border-color: #1e293b;
    --sq-light: #1e293b;
    --sq-dark: #0f172a;
    --sq-selected: #06b6d4;
    --sq-last-move: #3b82f6;
    --sq-legal-dot: rgba(6, 182, 212, 0.65);
    --sq-capture-ring: rgba(236, 72, 153, 0.75);
    --board-border: #06b6d4;
    --accent-gold: #06b6d4;
    --accent-gold-hover: #38bdf8;
}

/* THEME MIDNIGHT GLASS */
body.theme-midnight {
    --bg-main: #030712;
    --bg-card: #0f172a;
    --sq-light: #cbd5e1;
    --sq-dark: #334155;
    --sq-selected: #60a5fa;
    --sq-last-move: #475569;
    --board-border: #1e293b;
}

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

body {
    background: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
}

/* INTRO SCREEN */
body.intro-active .app {
    animation: arena-open .7s 2.1s both;
}

.fire-intro {
    position: fixed;
    z-index: 100;
    inset: 0;
    display: grid;
    place-items: center;
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 100%, #4b160e 0, #160d13 40%, #080d17 78%);
    animation: fire-intro-exit .7s 2.05s both;
    pointer-events: none;
}

.fire-intro.skipped {
    display: none !important;
}

.fire-glow {
    position: absolute;
    left: 50%;
    bottom: -34vh;
    width: min(100vw, 900px);
    aspect-ratio: 1;
    border-radius: 50%;
    background: radial-gradient(circle, #ffb72b55 0, #ff4a1730 35%, transparent 70%);
    transform: translateX(-50%);
    animation: fire-glow-pulse .7s ease-in-out infinite alternate;
}

.fire-flames {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.fire-flame {
    position: absolute;
    bottom: -20vh;
    left: var(--flame-x);
    width: var(--flame-size);
    height: calc(var(--flame-size) * 1.8);
    border-radius: 50% 0 50% 50%;
    background: linear-gradient(0deg, #fff2a1 0%, #ffb52e 24%, #ff5b1d 62%, #c51c13 100%);
    filter: drop-shadow(0 0 18px #ff5b1d88);
    opacity: 0;
    transform: rotate(45deg) scale(.7);
    transform-origin: 50% 100%;
    animation: flame-rise 1.15s ease-out infinite;
    animation-delay: var(--flame-delay);
}

.fire-flame:nth-child(1) { --flame-x: 4%; --flame-size: 15vh; --flame-delay: -.3s; }
.fire-flame:nth-child(2) { --flame-x: 13%; --flame-size: 22vh; --flame-delay: -.8s; }
.fire-flame:nth-child(3) { --flame-x: 22%; --flame-size: 13vh; --flame-delay: -.1s; }
.fire-flame:nth-child(4) { --flame-x: 31%; --flame-size: 25vh; --flame-delay: -.6s; }
.fire-flame:nth-child(5) { --flame-x: 39%; --flame-size: 17vh; --flame-delay: -.9s; }
.fire-flame:nth-child(6) { --flame-x: 47%; --flame-size: 27vh; --flame-delay: -.2s; }
.fire-flame:nth-child(7) { --flame-x: 56%; --flame-size: 16vh; --flame-delay: -.7s; }
.fire-flame:nth-child(8) { --flame-x: 64%; --flame-size: 24vh; --flame-delay: -.4s; }
.fire-flame:nth-child(9) { --flame-x: 73%; --flame-size: 14vh; --flame-delay: -.9s; }
.fire-flame:nth-child(10) { --flame-x: 81%; --flame-size: 22vh; --flame-delay: -.2s; }
.fire-flame:nth-child(11) { --flame-x: 90%; --flame-size: 17vh; --flame-delay: -.6s; }

.fire-title {
    position: relative;
    z-index: 101;
    text-align: center;
    animation: title-ignite 1.2s .15s both;
    pointer-events: auto;
}

.fire-title span.fire-icon {
    display: block;
    color: #ffc15b;
    font-size: clamp(70px, 12vw, 130px);
    line-height: 1;
    text-shadow: 0 0 22px #ff7b24, 0 0 65px #ff3b16;
}

.fire-title p {
    margin-top: 20px;
    color: #fff1d2;
    font-family: var(--font-heading);
    font-size: clamp(16px, 3.2vw, 28px);
    letter-spacing: .22em;
    text-shadow: 0 0 16px #ff6a20;
}

.fire-title small {
    display: block;
    margin-top: 10px;
    color: #ffbd68;
    font-size: 11px;
    letter-spacing: .35em;
}

.skip-btn {
    margin-top: 24px;
    padding: 10px 22px;
    background: rgba(255, 189, 104, 0.2);
    border: 1px solid #ffbd68;
    color: #fff1d2;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 13px;
    border-radius: 20px;
    cursor: pointer;
    transition: all .2s;
    pointer-events: auto;
}

.skip-btn:hover {
    background: #ffbd68;
    color: #1a0f07;
    transform: scale(1.05);
}

@keyframes flame-rise {
    0% { opacity: 0; transform: translateY(0) rotate(45deg) scale(.65, .8); }
    18% { opacity: .9; }
    100% { opacity: 0; transform: translateY(-100vh) rotate(38deg) scale(.35, 1.1); }
}

@keyframes fire-glow-pulse {
    from { opacity: .55; transform: translateX(-50%) scale(.9); }
    to { opacity: 1; transform: translateX(-50%) scale(1.12); }
}

@keyframes title-ignite {
    from { opacity: 0; transform: translateY(18px) scale(.94); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes fire-intro-exit {
    0%, 64% { opacity: 1; visibility: visible; }
    100% { opacity: 0; visibility: hidden; }
}

@keyframes arena-open {
    from { opacity: 0; transform: translateY(14px); visibility: hidden; }
    to { opacity: 1; transform: translateY(0); visibility: visible; }
}

/* APP CONTAINER */
.app {
    max-width: 1480px;
    margin: 0 auto;
    padding: 20px 35px 35px;
}

/* TOP HEADER */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    gap: 20px;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    font-size: 40px;
    color: var(--accent-gold);
    filter: drop-shadow(0 0 8px rgba(216, 174, 101, 0.4));
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 20px;
    letter-spacing: 2px;
}

.logo p {
    font-size: 9px;
    color: var(--accent-gold);
    letter-spacing: 4px;
    margin-top: 4px;
    font-weight: 700;
}

/* MODE NAV PILLS */
.mode-nav {
    display: flex;
    gap: 8px;
    background: var(--bg-card);
    padding: 4px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.mode-pill {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 7px;
    cursor: pointer;
    transition: all .2s;
}

.mode-pill:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.mode-pill.active {
    background: var(--accent-gold);
    color: #0b1322;
    box-shadow: 0 2px 10px rgba(216, 174, 101, 0.35);
}

/* TOP RIGHT ACTIONS */
.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-select-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 8px;
}

.theme-dropdown {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    outline: none;
}

.theme-dropdown option {
    background: var(--bg-card);
    color: #ffffff;
}

.icon-btn {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: grid;
    place-items: center;
    font-size: 16px;
    cursor: pointer;
    transition: all .2s;
}

.icon-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-highlight);
    transform: translateY(-1px);
}

/* MAIN GRID LAYOUT */
main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 380px;
    gap: 40px;
    margin-top: 30px;
}

/* GAME SECTION */
.game-headline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.small-title {
    color: var(--accent-gold);
    font-size: 10px;
    letter-spacing: 3px;
    margin-bottom: 6px;
    font-weight: 700;
}

.game-headline h2 {
    font-size: 32px;
    font-family: var(--font-heading);
    letter-spacing: 1px;
}

.game-headline h2 span {
    color: var(--accent-gold);
}

.header-badges {
    display: flex;
    gap: 8px;
}

.badge {
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    padding: 7px 13px;
    color: var(--accent-gold);
    font-size: 11px;
    font-weight: 700;
    border-radius: 6px;
    letter-spacing: 1px;
}

.opening-badge {
    color: var(--accent-cyan);
    border-color: rgba(56, 189, 248, 0.3);
}

/* PLAYER BARS */
.player-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    margin-bottom: 12px;
    transition: all .3s;
}

.player-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.avatar {
    width: 44px;
    height: 44px;
    border-radius: 9px;
    display: grid;
    place-items: center;
    font-size: 26px;
}

.black-avatar {
    background: #1e293b;
    color: #ffffff;
    border: 1px solid #334155;
}

.white-avatar {
    background: var(--accent-gold);
    color: #111b2b;
}

.player-details .name-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.player-details h3 {
    font-size: 15px;
    font-weight: 700;
}

.elo-tag {
    font-size: 10px;
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 7px;
    border-radius: 4px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.captured-tray {
    display: flex;
    align-items: center;
    gap: 3px;
    margin-top: 5px;
    min-height: 20px;
}

.captured-tray svg {
    width: 17px;
    height: 17px;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
}

.player-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.material-diff {
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-gold);
}

.clock-display {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 700;
    background: rgba(0, 0, 0, 0.35);
    padding: 6px 14px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    color: #e2e8f0;
    letter-spacing: 1px;
}

.clock-display.low-time {
    color: #f87171;
    border-color: #ef4444;
    animation: clock-pulse 1s infinite;
}

@keyframes clock-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.player-status {
    color: var(--text-muted);
    font-size: 11px;
    letter-spacing: 1px;
    font-weight: 700;
    min-width: 80px;
    text-align: right;
}

.player-status.active {
    color: var(--accent-green);
}

/* BOARD STAGE (EVAL BAR + CHESSBOARD) */
.board-stage {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 16px;
    margin: 10px 0 16px;
}

/* EVALUATION BAR */
.eval-bar-wrapper {
    width: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.eval-bar-inner {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column-reverse;
    background: var(--eval-black);
}

.eval-bar-white {
    width: 100%;
    height: 50%; /* 50% default = 0.0 */
    background: var(--eval-white);
    transition: height .4s ease-out;
}

.eval-score {
    position: absolute;
    bottom: 6px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 9px;
    font-weight: 800;
    font-family: var(--font-mono);
    color: #0b1322;
    z-index: 2;
}

/* BOARD WRAPPER */
.board-wrapper {
    flex: 1;
    max-width: 630px;
    position: relative;
    padding-left: 22px;
    padding-bottom: 22px;
}

.board {
    width: 100%;
    aspect-ratio: 1;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    border: 5px solid var(--board-border);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.65);
    position: relative;
    user-select: none;
}

.square {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    user-select: none;
    transition: filter .12s;
}

.square.light {
    background: var(--sq-light);
}

.square.dark {
    background: var(--sq-dark);
}

.square:hover {
    filter: brightness(1.08);
}

.square.selected {
    background: var(--sq-selected) !important;
}

.square.last-move {
    background: var(--sq-last-move) !important;
}

.square.in-check {
    background: var(--sq-in-check) !important;
    animation: check-pulse .9s infinite alternate;
}

@keyframes check-pulse {
    from { box-shadow: inset 0 0 15px rgba(239, 68, 68, 0.8); }
    to { box-shadow: inset 0 0 35px rgba(239, 68, 68, 1); }
}

.square.legal::after {
    content: "";
    position: absolute;
    width: 28%;
    height: 28%;
    border-radius: 50%;
    background: var(--sq-legal-dot);
    pointer-events: none;
    z-index: 4;
}

.square.capture::after {
    content: "";
    position: absolute;
    width: 82%;
    height: 82%;
    border: 5px solid var(--sq-capture-ring);
    border-radius: 50%;
    pointer-events: none;
    z-index: 4;
}

/* PIECE STYLING */
.piece {
    position: relative;
    z-index: 3;
    width: 88%;
    height: 88%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    transition: transform .1s;
}

.piece:active {
    cursor: grabbing;
    transform: scale(1.1);
}

.chess-piece-svg {
    width: 100%;
    height: 100%;
    display: block;
    filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.35));
    pointer-events: none;
}

/* SVG ARROW OVERLAY */
.board-svg-overlay {
    position: absolute;
    top: 0;
    left: 22px;
    right: 0;
    bottom: 22px;
    width: calc(100% - 22px);
    height: calc(100% - 22px);
    pointer-events: none;
    z-index: 5;
}

/* COORDINATES */
.coordinates-left {
    position: absolute;
    left: 2px;
    top: 0;
    bottom: 22px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-gold);
    font-family: var(--font-mono);
}

.coordinates-bottom {
    position: absolute;
    bottom: 2px;
    left: 22px;
    right: 0;
    display: flex;
    justify-content: space-around;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-gold);
    font-family: var(--font-mono);
}

/* PROMOTION MODAL */
.promotion-modal {
    position: absolute;
    inset: 0;
    left: 22px;
    bottom: 22px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: grid;
    place-items: center;
    z-index: 20;
    border-radius: 6px;
    transition: opacity .2s;
}

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

.promotion-card {
    background: var(--bg-card);
    border: 1px solid var(--accent-gold);
    border-radius: 12px;
    padding: 18px 24px;
    text-align: center;
    box-shadow: 0 15px 40px rgba(0,0,0,0.8);
}

.promotion-card p {
    font-family: var(--font-heading);
    font-size: 13px;
    letter-spacing: 2px;
    color: var(--accent-gold);
    margin-bottom: 15px;
}

.promotion-choices {
    display: flex;
    gap: 12px;
}

.promo-btn {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    background: #1e293b;
    border: 1px solid #334155;
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: all .15s;
    padding: 8px;
}

.promo-btn:hover {
    background: var(--accent-gold);
    border-color: #ffffff;
    transform: translateY(-3px);
}

/* GAME OVER OVERLAY */
.game-over-overlay {
    position: absolute;
    inset: 0;
    left: 22px;
    bottom: 22px;
    background: rgba(8, 13, 23, 0.88);
    backdrop-filter: blur(8px);
    display: grid;
    place-items: center;
    z-index: 25;
    border-radius: 6px;
    animation: modal-fade .3s ease-out;
}

.game-over-overlay.hidden {
    display: none;
}

.game-over-card {
    background: var(--bg-card);
    border: 2px solid var(--accent-gold);
    border-radius: 16px;
    padding: 30px 40px;
    text-align: center;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.9);
    max-width: 360px;
}

.trophy-icon {
    font-size: 55px;
    margin-bottom: 12px;
}

.game-over-card h2 {
    font-family: var(--font-heading);
    font-size: 26px;
    color: var(--accent-gold);
    margin-bottom: 8px;
}

.game-over-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.game-over-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

@keyframes modal-fade {
    from { opacity: 0; transform: scale(.92); }
    to { opacity: 1; transform: scale(1); }
}

/* CONTROLS */
.controls {
    display: flex;
    gap: 10px;
    margin-top: 18px;
    flex-wrap: wrap;
}

button {
    cursor: pointer;
    border: none;
    font-weight: 700;
    font-family: var(--font-body);
    transition: all .18s;
}

.primary-btn {
    background: var(--accent-gold);
    color: #101827;
    padding: 12px 22px;
    border-radius: 8px;
    font-size: 13px;
    box-shadow: 0 4px 12px rgba(216, 174, 101, 0.25);
}

.primary-btn:hover {
    background: var(--accent-gold-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(216, 174, 101, 0.4);
}

.control-btn {
    background: var(--bg-card);
    color: #e2e8f0;
    padding: 12px 18px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 13px;
}

.control-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-highlight);
    transform: translateY(-1px);
}

.hint-btn {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
}

.danger-btn:hover {
    background: rgba(244, 63, 94, 0.2);
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.full-btn {
    width: 100%;
    margin-top: 15px;
}

/* SIDEBAR */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* SIDEBAR TABS */
.sidebar-tabs {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 4px;
    gap: 4px;
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    white-space: nowrap;
    transition: all .15s;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-gold);
    color: #0b1322;
    box-shadow: 0 2px 8px rgba(216, 174, 101, 0.3);
}

.tab-content {
    display: none;
    flex-direction: column;
    gap: 16px;
}

.tab-content.active {
    display: flex;
}

/* CARDS */
.sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
}

.card-label {
    color: var(--text-muted);
    font-size: 10px;
    letter-spacing: 2px;
    font-weight: 700;
}

.status-card h2 {
    margin-top: 10px;
    font-size: 24px;
    color: var(--accent-gold);
    font-family: var(--font-heading);
}

.status-line {
    margin-top: 12px;
    color: #94a3b8;
    font-size: 13px;
    display: flex;
    align-items: center;
}

.status-indicator {
    display: inline-block;
    background: var(--accent-green);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 8px;
    box-shadow: 0 0 6px var(--accent-green);
}

.card-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.eco-tag {
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    background: rgba(56, 189, 248, 0.12);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid rgba(56, 189, 248, 0.3);
}

.opening-card h3 {
    font-size: 16px;
    color: #ffffff;
    margin-top: 6px;
}

.opening-sub {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
    line-height: 1.4;
}

.hint-card {
    border-color: rgba(216, 174, 101, 0.35);
}

.hint-badge {
    font-size: 10px;
    color: var(--accent-gold);
    background: rgba(216, 174, 101, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
}

.hint-empty {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
    margin-top: 6px;
}

.hint-active-box {
    margin-top: 8px;
    background: rgba(216, 174, 101, 0.08);
    border-left: 3px solid var(--accent-gold);
    padding: 10px 12px;
    border-radius: 4px;
}

.hint-move-tag {
    font-family: var(--font-mono);
    font-size: 15px;
    font-weight: 800;
    color: var(--accent-gold);
}

.hint-reason {
    font-size: 12px;
    color: #cbd5e1;
    margin-top: 4px;
    line-height: 1.4;
}

/* MOVE HISTORY */
.moves-card h3 {
    font-size: 15px;
}

.live-pill {
    font-size: 10px;
    color: var(--accent-green);
    font-weight: 700;
}

.move-list {
    margin-top: 14px;
    max-height: 280px;
    overflow-y: auto;
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.move-row {
    display: grid;
    grid-template-columns: 40px 1fr 1fr;
    padding: 9px 12px;
    font-size: 12px;
    font-family: var(--font-mono);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    align-items: center;
}

.move-row:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.move-number {
    color: var(--text-muted);
}

.move-cell {
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all .12s;
    color: #e2e8f0;
}

.move-cell:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.move-cell.active-history {
    background: var(--accent-gold);
    color: #0b1322;
    font-weight: 700;
}

.empty-moves {
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    padding: 24px 0;
}

.history-controls {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.nav-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.06);
    color: #e2e8f0;
    padding: 8px 0;
    border-radius: 6px;
    font-size: 12px;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* SETTINGS TAB */
.settings-card h3 {
    font-size: 16px;
    margin-bottom: 18px;
}

.setting-group {
    margin-bottom: 18px;
}

.setting-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 8px;
}

.difficulty-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.diff-btn {
    background: #182337;
    border: 1px solid var(--border-color);
    padding: 10px 8px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    transition: all .15s;
}

.diff-btn .diff-title {
    font-size: 12px;
    color: #ffffff;
    font-weight: 600;
}

.diff-btn .diff-elo {
    font-size: 10px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.diff-btn.active {
    background: rgba(216, 174, 101, 0.15);
    border-color: var(--accent-gold);
}

.diff-btn.active .diff-title {
    color: var(--accent-gold);
}

.color-select-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
}

.color-btn {
    background: #182337;
    border: 1px solid var(--border-color);
    padding: 10px 0;
    border-radius: 8px;
    font-size: 12px;
    color: #e2e8f0;
}

.color-btn.active {
    background: var(--accent-gold);
    color: #0b1322;
    border-color: var(--accent-gold);
}

.styled-select {
    width: 100%;
    background: #182337;
    border: 1px solid var(--border-color);
    color: #ffffff;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 13px;
    outline: none;
    cursor: pointer;
}

/* PUZZLES TAB */
.puzzles-card h3 {
    font-size: 15px;
}

.puzzle-score {
    font-size: 11px;
    color: var(--accent-gold);
    font-weight: 700;
}

.puzzle-filter {
    display: flex;
    gap: 6px;
    margin: 12px 0 16px;
}

.p-filter-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 10px;
    padding: 6px 0;
    border-radius: 6px;
}

.p-filter-btn.active {
    background: var(--accent-gold);
    color: #0b1322;
    border-color: var(--accent-gold);
}

.puzzle-box {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 14px;
}

.puzzle-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.puzzle-box h4 {
    font-size: 16px;
    margin-bottom: 6px;
    color: #ffffff;
}

.puzzle-prompt {
    font-size: 12px;
    color: #cbd5e1;
    line-height: 1.4;
}

.puzzle-feedback {
    margin-top: 10px;
    font-size: 12px;
    font-weight: 700;
    min-height: 18px;
}

.puzzle-feedback.success {
    color: var(--accent-green);
}

.puzzle-feedback.wrong {
    color: var(--accent-red);
}

.puzzle-actions {
    display: flex;
    gap: 8px;
}

.puzzle-actions button {
    flex: 1;
}

/* TOOLS TAB (PGN/FEN) */
.tools-card h3 {
    font-size: 16px;
    margin-bottom: 16px;
}

.tool-section {
    margin-bottom: 16px;
}

.tool-section label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 600;
}

.input-with-btn {
    display: flex;
    gap: 6px;
}

.input-with-btn input {
    flex: 1;
    background: #182337;
    border: 1px solid var(--border-color);
    color: #e2e8f0;
    padding: 9px 12px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    outline: none;
}

.tool-section textarea {
    width: 100%;
    background: #182337;
    border: 1px solid var(--border-color);
    color: #e2e8f0;
    padding: 10px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    resize: none;
    outline: none;
}

.tool-buttons {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.tool-buttons button {
    flex: 1;
}

/* FOOTER MOTTO */
.footer-note {
    color: var(--accent-gold);
    font-family: var(--font-heading);
    text-align: center;
    font-size: 10px;
    letter-spacing: 2px;
    padding: 15px;
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 10px;
    letter-spacing: 2px;
    padding: 40px 0 10px;
}

/* RESPONSIVE DESIGN */
@media (max-width: 1050px) {
    main {
        grid-template-columns: 1fr;
    }

    .board-wrapper {
        max-width: 580px;
    }
}

@media (max-width: 650px) {
    .app {
        padding: 15px 12px;
    }

    header {
        justify-content: center;
    }

    .mode-nav {
        order: 3;
        width: 100%;
        justify-content: space-around;
    }

    .mode-pill {
        padding: 6px 10px;
        font-size: 11px;
    }

    .game-headline h2 {
        font-size: 24px;
    }

    .board-wrapper {
        padding-left: 16px;
        padding-bottom: 16px;
    }

    .coordinates-left,
    .coordinates-bottom {
        font-size: 9px;
    }

    .eval-bar-wrapper {
        width: 20px;
    }

    .controls {
        flex-wrap: wrap;
    }

    .controls button {
        flex: 1;
        padding: 10px 8px;
        font-size: 11px;
    }

    .clock-display {
        font-size: 16px;
        padding: 4px 10px;
    }
}