diff --git a/chess/public/styles.css b/chess/public/styles.css
new file mode 100644
index 0000000..64af9f2
--- /dev/null
+++ b/chess/public/styles.css
@@ -0,0 +1,1488 @@
+/* =========================================================
+   CHESS APP — COMPLETE STYLES
+   Исправленная версия:
+   - шахматная доска не съезжает
+   - адаптивность PC / планшет / телефон
+   - Party Mode
+   - чат
+   - часы
+   - кнопки сдачи / ничьей / реванша
+   ========================================================= */
+
+:root {
+    --bg: #0e0f13;
+    --bg-2: #15171d;
+
+    --panel: rgba(25, 27, 34, 0.94);
+    --panel-2: rgba(31, 34, 42, 0.96);
+
+    --border: rgba(255, 255, 255, 0.09);
+    --border-hover: rgba(255, 255, 255, 0.18);
+
+    --text: #f1f1f1;
+    --text-soft: #a7abb5;
+    --text-muted: #727782;
+
+    --accent: #d9a441;
+    --accent-hover: #edbb58;
+
+    --danger: #d95c5c;
+    --success: #65b97c;
+    --warning: #d7a84b;
+
+    --board-light: #e6d3ad;
+    --board-dark: #9b754c;
+
+    --board-size: min(78vh, 720px);
+
+    --radius: 12px;
+
+    --shadow:
+        0 18px 50px rgba(0, 0, 0, 0.35);
+}
+
+* {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}
+
+html {
+    width: 100%;
+    min-height: 100%;
+    background: var(--bg);
+    color: var(--text);
+    font-family:
+        Inter,
+        system-ui,
+        -apple-system,
+        BlinkMacSystemFont,
+        "Segoe UI",
+        sans-serif;
+}
+
+body {
+    width: 100%;
+    min-height: 100vh;
+    min-height: 100dvh;
+
+    background:
+        radial-gradient(
+            circle at top left,
+            rgba(217, 164, 65, 0.055),
+            transparent 32%
+        ),
+        linear-gradient(
+            145deg,
+            #0b0c10,
+            #111319 55%,
+            #0b0c10
+        );
+
+    color: var(--text);
+
+    overflow-x: hidden;
+}
+
+button,
+input,
+textarea {
+    font: inherit;
+}
+
+button {
+    border: 0;
+    outline: 0;
+}
+
+button:focus-visible,
+input:focus-visible,
+textarea:focus-visible {
+    outline: 2px solid var(--accent);
+    outline-offset: 2px;
+}
+
+.hidden {
+    display: none !important;
+}
+
+/* =========================================================
+   APP
+   ========================================================= */
+
+#app {
+    width: 100%;
+    min-height: 100vh;
+    min-height: 100dvh;
+
+    display: flex;
+    flex-direction: column;
+}
+
+/* =========================================================
+   HEADER
+   ========================================================= */
+
+.topbar,
+header {
+    width: 100%;
+    min-height: 64px;
+
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+
+    padding: 10px 18px;
+
+    background: rgba(16, 17, 22, 0.92);
+    border-bottom: 1px solid var(--border);
+
+    backdrop-filter: blur(16px);
+    -webkit-backdrop-filter: blur(16px);
+
+    position: sticky;
+    top: 0;
+    z-index: 100;
+}
+
+.logo {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+
+    color: var(--text);
+    font-size: 19px;
+    font-weight: 700;
+    letter-spacing: 0.4px;
+}
+
+.logo span {
+    color: var(--accent);
+}
+
+.header-actions {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+/* =========================================================
+   BUTTONS
+   ========================================================= */
+
+.btn {
+    min-height: 40px;
+
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    gap: 7px;
+
+    padding: 8px 14px;
+
+    border: 1px solid var(--border);
+    border-radius: 8px;
+
+    background: rgba(255, 255, 255, 0.045);
+    color: var(--text);
+
+    cursor: pointer;
+
+    transition:
+        background 0.18s ease,
+        border-color 0.18s ease,
+        transform 0.15s ease,
+        color 0.18s ease;
+}
+
+.btn:hover {
+    background: rgba(255, 255, 255, 0.085);
+    border-color: var(--border-hover);
+}
+
+.btn:active {
+    transform: translateY(1px);
+}
+
+.btn-primary {
+    background: var(--accent);
+    border-color: var(--accent);
+    color: #17120a;
+    font-weight: 700;
+}
+
+.btn-primary:hover {
+    background: var(--accent-hover);
+    border-color: var(--accent-hover);
+}
+
+.btn-danger {
+    color: #fff;
+    background: rgba(217, 92, 92, 0.13);
+    border-color: rgba(217, 92, 92, 0.3);
+}
+
+.btn-danger:hover {
+    background: rgba(217, 92, 92, 0.22);
+}
+
+.btn-success {
+    color: #fff;
+    background: rgba(101, 185, 124, 0.13);
+    border-color: rgba(101, 185, 124, 0.3);
+}
+
+.btn-success:hover {
+    background: rgba(101, 185, 124, 0.22);
+}
+
+.btn-warning {
+    color: #fff;
+    background: rgba(215, 168, 75, 0.13);
+    border-color: rgba(215, 168, 75, 0.3);
+}
+
+/* =========================================================
+   MAIN LAYOUT
+   ========================================================= */
+
+.main,
+main {
+    width: 100%;
+    flex: 1;
+
+    display: grid;
+    grid-template-columns:
+        minmax(0, 1fr)
+        minmax(260px, 350px);
+
+    gap: 18px;
+
+    padding: 18px;
+
+    align-items: start;
+}
+
+/* =========================================================
+   GAME AREA
+   ========================================================= */
+
+.game-area {
+    min-width: 0;
+    width: 100%;
+
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+}
+
+/* =========================================================
+   PLAYER
+   ========================================================= */
+
+.player {
+    width: min(var(--board-size), 100%);
+
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+
+    min-height: 48px;
+
+    margin: 0 auto 8px;
+    padding: 7px 10px;
+
+    background: rgba(255, 255, 255, 0.035);
+
+    border: 1px solid var(--border);
+    border-radius: 9px;
+}
+
+.player-info {
+    min-width: 0;
+
+    display: flex;
+    align-items: center;
+    gap: 9px;
+}
+
+.player-avatar {
+    width: 32px;
+    height: 32px;
+
+    flex: 0 0 32px;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    border-radius: 50%;
+
+    background: rgba(255, 255, 255, 0.08);
+}
+
+.player-name {
+    min-width: 0;
+
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+
+    font-weight: 600;
+}
+
+.player-status {
+    color: var(--text-muted);
+    font-size: 12px;
+}
+
+/* =========================================================
+   CHESS CLOCK
+   ========================================================= */
+
+.clock {
+    min-width: 82px;
+
+    padding: 7px 10px;
+
+    border-radius: 7px;
+
+    background: #0a0b0e;
+    border: 1px solid rgba(255, 255, 255, 0.07);
+
+    color: #fff;
+
+    text-align: center;
+
+    font-family:
+        "SFMono-Regular",
+        Consolas,
+        "Liberation Mono",
+        monospace;
+
+    font-size: 19px;
+    font-weight: 700;
+
+    letter-spacing: 1px;
+}
+
+.clock.active {
+    background: rgba(217, 164, 65, 0.14);
+    border-color: rgba(217, 164, 65, 0.45);
+    color: var(--accent);
+}
+
+.clock.low {
+    color: var(--danger);
+    border-color: rgba(217, 92, 92, 0.4);
+}
+
+/* =========================================================
+   BOARD WRAPPER
+   ========================================================= */
+
+.board-wrapper {
+    width: min(var(--board-size), calc(100vw - 36px));
+
+    aspect-ratio: 1 / 1;
+
+    position: relative;
+
+    flex: 0 0 auto;
+
+    margin: 0 auto;
+
+    border-radius: 4px;
+
+    box-shadow:
+        0 15px 40px rgba(0, 0, 0, 0.38),
+        0 0 0 1px rgba(255, 255, 255, 0.07);
+
+    overflow: hidden;
+}
+
+/*
+   ВАЖНО:
+   Доска всегда квадратная.
+   Не использовать width: 100% без aspect-ratio.
+*/
+
+#board,
+.chessboard,
+.board {
+    width: 100% !important;
+    height: 100% !important;
+
+    aspect-ratio: 1 / 1;
+
+    display: grid !important;
+
+    grid-template-columns:
+        repeat(8, minmax(0, 1fr)) !important;
+
+    grid-template-rows:
+        repeat(8, minmax(0, 1fr)) !important;
+
+    position: relative;
+
+    overflow: hidden;
+}
+
+/* =========================================================
+   CHESS SQUARE
+   ========================================================= */
+
+.square,
+.cell,
+.board-square {
+    width: 100%;
+    height: 100%;
+
+    min-width: 0;
+    min-height: 0;
+
+    position: relative;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    user-select: none;
+    -webkit-user-select: none;
+
+    touch-action: manipulation;
+
+    cursor: pointer;
+}
+
+.square.light,
+.cell.light,
+.board-square.light {
+    background: var(--board-light);
+}
+
+.square.dark,
+.cell.dark,
+.board-square.dark {
+    background: var(--board-dark);
+}
+
+.square:hover {
+    filter: brightness(1.05);
+}
+
+/* =========================================================
+   CHESS PIECES
+   ========================================================= */
+
+.piece {
+    width: 90%;
+    height: 90%;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    position: relative;
+    z-index: 4;
+
+    font-family:
+        "Noto Sans Symbols 2",
+        "Segoe UI Symbol",
+        "DejaVu Sans",
+        sans-serif;
+
+    font-size: clamp(
+        28px,
+        calc(var(--board-size) / 10),
+        72px
+    );
+
+    line-height: 1;
+
+    cursor: pointer;
+
+    user-select: none;
+    -webkit-user-select: none;
+
+    transition:
+        transform 0.1s ease;
+}
+
+.square:active .piece {
+    transform: scale(0.95);
+}
+
+/* белые фигуры */
+
+.piece.white,
+.piece[data-color="w"] {
+    color: #fff;
+
+    text-shadow:
+        0 1px 0 #777,
+        0 2px 2px rgba(0, 0, 0, 0.5);
+}
+
+/* чёрные фигуры */
+
+.piece.black,
+.piece[data-color="b"] {
+    color: #171717;
+
+    text-shadow:
+        0 1px 0 rgba(255,255,255,0.15),
+        0 2px 2px rgba(0, 0, 0, 0.35);
+}
+
+/* =========================================================
+   SELECTED SQUARE
+   ========================================================= */
+
+.square.selected {
+    box-shadow:
+        inset 0 0 0 4px rgba(217, 164, 65, 0.85);
+}
+
+.square.last-move {
+    box-shadow:
+        inset 0 0 0 999px rgba(217, 164, 65, 0.16);
+}
+
+.square.legal::after {
+    content: "";
+
+    width: 23%;
+    height: 23%;
+
+    position: absolute;
+
+    top: 50%;
+    left: 50%;
+
+    transform: translate(-50%, -50%);
+
+    border-radius: 50%;
+
+    background: rgba(25, 25, 25, 0.28);
+
+    pointer-events: none;
+}
+
+.square.capture::after {
+    content: "";
+
+    position: absolute;
+
+    inset: 8%;
+
+    border-radius: 50%;
+
+    border: 4px solid rgba(217, 164, 65, 0.75);
+
+    pointer-events: none;
+}
+
+/* =========================================================
+   CHECK
+   ========================================================= */
+
+.square.check {
+    background:
+        radial-gradient(
+            circle,
+            rgba(217, 70, 70, 0.9),
+            rgba(180, 40, 40, 0.5) 50%,
+            transparent 75%
+        );
+}
+
+/* =========================================================
+   BOARD COORDINATES
+   ========================================================= */
+
+.coordinate {
+    position: absolute;
+
+    z-index: 8;
+
+    font-size: clamp(8px, 1.2vw, 13px);
+
+    font-weight: 700;
+
+    pointer-events: none;
+
+    opacity: 0.7;
+}
+
+.coordinate.rank {
+    top: 3px;
+    left: 4px;
+}
+
+.coordinate.file {
+    right: 4px;
+    bottom: 2px;
+}
+
+/* =========================================================
+   GAME CONTROLS
+   ========================================================= */
+
+.game-controls {
+    width: min(var(--board-size), 100%);
+
+    display: grid;
+
+    grid-template-columns:
+        repeat(4, minmax(0, 1fr));
+
+    gap: 8px;
+
+    margin-top: 12px;
+}
+
+.game-controls .btn {
+    width: 100%;
+}
+
+/* =========================================================
+   SIDEBAR
+   ========================================================= */
+
+.sidebar {
+    width: 100%;
+    min-width: 0;
+
+    display: flex;
+    flex-direction: column;
+
+    gap: 12px;
+}
+
+.panel {
+    width: 100%;
+
+    background: var(--panel);
+
+    border: 1px solid var(--border);
+
+    border-radius: var(--radius);
+
+    box-shadow: var(--shadow);
+
+    overflow: hidden;
+}
+
+.panel-header {
+    min-height: 48px;
+
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+
+    padding: 10px 13px;
+
+    border-bottom: 1px solid var(--border);
+
+    font-weight: 700;
+}
+
+.panel-title {
+    font-size: 14px;
+}
+
+.panel-content {
+    padding: 12px;
+}
+
+/* =========================================================
+   GAME INFO
+   ========================================================= */
+
+.game-info {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+
+    gap: 8px;
+}
+
+.info-item {
+    padding: 10px;
+
+    background: rgba(255, 255, 255, 0.035);
+
+    border: 1px solid var(--border);
+
+    border-radius: 8px;
+}
+
+.info-label {
+    color: var(--text-muted);
+    font-size: 11px;
+}
+
+.info-value {
+    margin-top: 3px;
+
+    font-weight: 700;
+}
+
+/* =========================================================
+   PARTY MODE
+   ========================================================= */
+
+.party {
+    width: 100%;
+}
+
+.party-users {
+    display: flex;
+    flex-direction: column;
+    gap: 7px;
+
+    max-height: 250px;
+    overflow-y: auto;
+}
+
+.party-user {
+    min-height: 40px;
+
+    display: flex;
+    align-items: center;
+    gap: 9px;
+
+    padding: 7px 9px;
+
+    background: rgba(255, 255, 255, 0.035);
+
+    border: 1px solid var(--border);
+
+    border-radius: 8px;
+}
+
+.party-user-avatar {
+    width: 28px;
+    height: 28px;
+
+    flex: 0 0 28px;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    border-radius: 50%;
+
+    background: rgba(255, 255, 255, 0.08);
+}
+
+.party-user-name {
+    min-width: 0;
+
+    flex: 1;
+
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.party-user-status {
+    width: 8px;
+    height: 8px;
+
+    border-radius: 50%;
+
+    background: var(--success);
+}
+
+/* =========================================================
+   SPECTATORS
+   ========================================================= */
+
+.spectators {
+    color: var(--text-soft);
+    font-size: 13px;
+}
+
+.spectators strong {
+    color: var(--text);
+}
+
+/* =========================================================
+   CHAT
+   ========================================================= */
+
+.chat {
+    display: flex;
+    flex-direction: column;
+
+    height: 380px;
+    min-height: 280px;
+}
+
+.chat-messages {
+    flex: 1;
+
+    min-height: 0;
+
+    overflow-y: auto;
+
+    display: flex;
+    flex-direction: column;
+
+    gap: 7px;
+
+    padding: 10px;
+}
+
+.chat-message {
+    max-width: 88%;
+
+    padding: 7px 9px;
+
+    background: rgba(255, 255, 255, 0.05);
+
+    border: 1px solid var(--border);
+
+    border-radius: 8px;
+
+    font-size: 13px;
+
+    overflow-wrap: anywhere;
+}
+
+.chat-message.own {
+    align-self: flex-end;
+
+    background: rgba(217, 164, 65, 0.12);
+
+    border-color: rgba(217, 164, 65, 0.25);
+}
+
+.chat-author {
+    margin-bottom: 2px;
+
+    color: var(--accent);
+
+    font-size: 11px;
+    font-weight: 700;
+}
+
+.chat-input-area {
+    display: flex;
+    gap: 7px;
+
+    padding: 9px;
+
+    border-top: 1px solid var(--border);
+}
+
+.chat-input {
+    min-width: 0;
+    flex: 1;
+
+    height: 40px;
+
+    padding: 0 10px;
+
+    border: 1px solid var(--border);
+
+    border-radius: 8px;
+
+    background: rgba(0, 0, 0, 0.2);
+
+    color: var(--text);
+
+    outline: none;
+}
+
+.chat-input::placeholder {
+    color: var(--text-muted);
+}
+
+.chat-input:focus {
+    border-color: rgba(217, 164, 65, 0.5);
+}
+
+.chat-send {
+    width: 40px;
+    height: 40px;
+
+    flex: 0 0 40px;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    border-radius: 8px;
+
+    background: var(--accent);
+    color: #17120a;
+
+    cursor: pointer;
+}
+
+/* =========================================================
+   MODAL
+   ========================================================= */
+
+.modal {
+    position: fixed;
+
+    inset: 0;
+
+    z-index: 1000;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    padding: 18px;
+
+    background: rgba(0, 0, 0, 0.68);
+
+    backdrop-filter: blur(7px);
+    -webkit-backdrop-filter: blur(7px);
+}
+
+.modal.hidden {
+    display: none !important;
+}
+
+.modal-content {
+    width: min(500px, 100%);
+
+    max-height: calc(100vh - 36px);
+    max-height: calc(100dvh - 36px);
+
+    overflow-y: auto;
+
+    padding: 20px;
+
+    background: var(--panel-2);
+
+    border: 1px solid var(--border);
+
+    border-radius: 12px;
+
+    box-shadow:
+        0 30px 80px rgba(0, 0, 0, 0.55);
+}
+
+.modal-title {
+    margin-bottom: 14px;
+
+    font-size: 20px;
+    font-weight: 700;
+}
+
+.modal-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 8px;
+
+    margin-top: 18px;
+}
+
+/* =========================================================
+   GAME RESULT
+   ========================================================= */
+
+.game-result {
+    position: absolute;
+
+    inset: 0;
+
+    z-index: 50;
+
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    background: rgba(0, 0, 0, 0.58);
+
+    backdrop-filter: blur(3px);
+}
+
+.game-result-card {
+    width: min(350px, calc(100% - 30px));
+
+    padding: 22px;
+
+    text-align: center;
+
+    background: rgba(20, 21, 26, 0.96);
+
+    border: 1px solid var(--border);
+
+    border-radius: 12px;
+
+    box-shadow: var(--shadow);
+}
+
+.game-result-title {
+    font-size: 24px;
+    font-weight: 800;
+}
+
+.game-result-text {
+    margin-top: 7px;
+
+    color: var(--text-soft);
+}
+
+.game-result-actions {
+    display: flex;
+
+    gap: 8px;
+
+    margin-top: 18px;
+}
+
+.game-result-actions .btn {
+    flex: 1;
+}
+
+/* =========================================================
+   NOTIFICATIONS
+   ========================================================= */
+
+.toast-container {
+    position: fixed;
+
+    right: 16px;
+    bottom: 16px;
+
+    z-index: 2000;
+
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+
+    width: min(350px, calc(100vw - 32px));
+}
+
+.toast {
+    padding: 11px 13px;
+
+    background: rgba(27, 29, 36, 0.96);
+
+    border: 1px solid var(--border);
+
+    border-radius: 9px;
+
+    box-shadow: var(--shadow);
+
+    font-size: 13px;
+}
+
+/* =========================================================
+   SCROLLBARS
+   ========================================================= */
+
+* {
+    scrollbar-width: thin;
+    scrollbar-color: rgba(255,255,255,0.15) transparent;
+}
+
+::-webkit-scrollbar {
+    width: 7px;
+    height: 7px;
+}
+
+::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+    background: rgba(255,255,255,0.15);
+    border-radius: 10px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+    background: rgba(255,255,255,0.25);
+}
+
+/* =========================================================
+   TABLET
+   ========================================================= */
+
+@media (max-width: 1100px) {
+
+    :root {
+        --board-size: min(72vw, 680px);
+    }
+
+    .main,
+    main {
+        grid-template-columns:
+            minmax(0, 1fr)
+            300px;
+
+        gap: 12px;
+
+        padding: 12px;
+    }
+
+    .game-controls {
+        grid-template-columns:
+            repeat(2, minmax(0, 1fr));
+    }
+
+}
+
+/* =========================================================
+   SMALL TABLET / LARGE PHONE
+   ========================================================= */
+
+@media (max-width: 820px) {
+
+    :root {
+        --board-size: min(
+            calc(100vw - 24px),
+            680px
+        );
+    }
+
+    .main,
+    main {
+        display: flex;
+        flex-direction: column;
+
+        width: 100%;
+
+        padding: 10px;
+    }
+
+    .game-area {
+        width: 100%;
+    }
+
+    .sidebar {
+        width: 100%;
+
+        display: grid;
+
+        grid-template-columns:
+            repeat(2, minmax(0, 1fr));
+
+        align-items: start;
+    }
+
+    .sidebar .chat {
+        grid-column: 1 / -1;
+    }
+
+    .board-wrapper {
+        width: min(
+            calc(100vw - 20px),
+            680px
+        );
+    }
+
+    .game-controls {
+        width: min(
+            calc(100vw - 20px),
+            680px
+        );
+    }
+}
+
+/* =========================================================
+   PHONE
+   ========================================================= */
+
+@media (max-width: 600px) {
+
+    :root {
+        --board-size: calc(100vw - 16px);
+    }
+
+    body {
+        overflow-x: hidden;
+    }
+
+    .topbar,
+    header {
+        min-height: 54px;
+
+        padding:
+            8px 9px;
+
+        position: relative;
+    }
+
+    .logo {
+        font-size: 16px;
+    }
+
+    .header-actions {
+        gap: 5px;
+    }
+
+    .header-actions .btn {
+        min-height: 36px;
+        padding: 6px 9px;
+
+        font-size: 12px;
+    }
+
+    .main,
+    main {
+        width: 100%;
+
+        padding: 8px;
+
+        gap: 10px;
+    }
+
+    .board-wrapper {
+        width: calc(100vw - 16px);
+        max-width: none;
+
+        border-radius: 2px;
+    }
+
+    #board,
+    .chessboard,
+    .board {
+        width: 100% !important;
+        height: 100% !important;
+    }
+
+    .piece {
+        width: 94%;
+        height: 94%;
+
+        font-size: calc(
+            (100vw - 16px) / 10
+        );
+    }
+
+    .player {
+        width: calc(100vw - 16px);
+
+        min-height: 43px;
+
+        padding: 5px 7px;
+
+        margin-bottom: 6px;
+    }
+
+    .player-avatar {
+        width: 27px;
+        height: 27px;
+
+        flex-basis: 27px;
+    }
+
+    .player-name {
+        max-width: 150px;
+
+        font-size: 13px;
+    }
+
+    .player-status {
+        font-size: 10px;
+    }
+
+    .clock {
+        min-width: 68px;
+
+        padding: 5px 7px;
+
+        font-size: 15px;
+    }
+
+    .game-controls {
+        width: calc(100vw - 16px);
+
+        grid-template-columns:
+            repeat(2, minmax(0, 1fr));
+
+        gap: 6px;
+
+        margin-top: 8px;
+    }
+
+    .game-controls .btn {
+        min-height: 40px;
+
+        padding: 7px 8px;
+
+        font-size: 12px;
+    }
+
+    .sidebar {
+        display: flex;
+
+        width: 100%;
+    }
+
+    .panel {
+        border-radius: 9px;
+    }
+
+    .chat {
+        height: 330px;
+    }
+
+    .modal {
+        padding: 10px;
+    }
+
+    .modal-content {
+        padding: 16px;
+
+        border-radius: 10px;
+    }
+
+    .modal-actions {
+        flex-direction: column;
+    }
+
+    .modal-actions .btn {
+        width: 100%;
+    }
+
+    .game-result-actions {
+        flex-direction: column;
+    }
+
+    .game-result-actions .btn {
+        width: 100%;
+    }
+}
+
+/* =========================================================
+   VERY SMALL PHONES
+   ========================================================= */
+
+@media (max-width: 380px) {
+
+    .main,
+    main {
+        padding: 5px;
+    }
+
+    .board-wrapper,
+    .player,
+    .game-controls {
+        width: calc(100vw - 10px);
+    }
+
+    .piece {
+        font-size: calc(
+            (100vw - 10px) / 10
+        );
+    }
+
+    .clock {
+        min-width: 62px;
+
+        font-size: 14px;
+    }
+
+    .player-name {
+        max-width: 105px;
+    }
+
+    .game-controls .btn {
+        font-size: 11px;
+        padding: 6px;
+    }
+}
+
+/* =========================================================
+   LANDSCAPE PHONE
+   ========================================================= */
+
+@media (max-height: 600px) and (orientation: landscape) {
+
+    :root {
+        --board-size: min(
+            calc(100vh - 90px),
+            calc(100vw - 250px)
+        );
+    }
+
+    .topbar,
+    header {
+        min-height: 46px;
+        padding: 5px 10px;
+    }
+
+    .main,
+    main {
+        display: flex;
+        flex-direction: row;
+
+        align-items: flex-start;
+
+        padding: 8px;
+    }
+
+    .game-area {
+        flex: 1;
+    }
+
+    .sidebar {
+        width: 280px;
+
+        flex: 0 0 280px;
+
+        max-height: calc(100vh - 62px);
+
+        overflow-y: auto;
+    }
+
+    .board-wrapper {
+        width: var(--board-size);
+    }
+
+    .player,
+    .game-controls {
+        width: var(--board-size);
+    }
+
+    .chat {
+        height: 260px;
+    }
+}
+
+/* =========================================================
+   SAFE AREA — ANDROID / IOS
+   ========================================================= */
+
+@supports (padding: env(safe-area-inset-bottom)) {
+
+    .topbar,
+    header {
+        padding-top:
+            max(
+                8px,
+                env(safe-area-inset-top)
+            );
+    }
+
+    body {
+        padding-bottom:
+            env(safe-area-inset-bottom);
+    }
+
+}
+
+/* =========================================================
+   REDUCED MOTION
+   ========================================================= */
+
+@media (prefers-reduced-motion: reduce) {
+
+    *,
+    *::before,
+    *::after {
+        animation-duration: 0.01ms !important;
+        animation-iteration-count: 1 !important;
+        transition-duration: 0.01ms !important;
+    }
+}
\ No newline at end of file