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

[hidden] {
    display: none !important;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #e8f4f8 0%, #f0e6f6 50%, #fce4ec 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
}

.game-container {
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 520px;
    padding: 32px 28px;
    min-height: 600px;
    display: flex;
    flex-direction: column;
    margin-block: auto;
}

.game-container.battle-layout {
    max-width: 820px;
    min-height: 0;
    padding: 24px 26px;
}

.game-container.battle-layout header {
    margin-bottom: 16px;
}

.game-container.battle-layout .save-status {
    margin-bottom: 12px;
}

.game-container.battle-layout .mode-switch {
    margin-bottom: 14px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    letter-spacing: 2px;
}

.header-actions,
.user-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-btn,
.logout-btn {
    border: none;
    border-radius: 20px;
    padding: 8px 14px;
    font-size: 13px;
    cursor: pointer;
}

.auth-btn {
    background: #5b8def;
    color: #fff;
}

.username {
    max-width: 110px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: #3559a8;
    font-size: 13px;
    font-weight: 600;
}

.logout-btn {
    background: #f3f4f6;
    color: #777;
}

.info-btn {
    background: #f0f0f0;
    border: none;
    border-radius: 20px;
    padding: 8px 18px;
    font-size: 14px;
    color: #666;
    cursor: pointer;
    transition: background 0.2s;
}

.info-btn:hover {
    background: #e0e0e0;
}

.save-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    margin: -10px 0 18px;
    padding: 8px 12px;
    border-radius: 10px;
    background: #eef8f0;
    color: #358145;
    font-size: 12px;
}

.save-status.guest {
    background: #fff7e6;
    color: #9a6b18;
}

.save-status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #4caf50;
}

.save-status.guest .save-status-dot {
    background: #e6a23c;
}

.mode-switch {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 20px;
    padding: 5px;
    border-radius: 14px;
    background: #f2f4f8;
}

.mode-btn {
    padding: 10px 12px;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: #7a8190;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.mode-btn.active {
    background: #fff;
    color: #466fc8;
    box-shadow: 0 2px 10px rgba(67, 91, 142, 0.1);
}

.campaign-panel {
    flex: 1;
}

.campaign-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.campaign-kicker {
    color: #6f8fd8;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
}

.campaign-heading h2 {
    margin-top: 3px;
    color: #303744;
    font-size: 22px;
}

.campaign-total {
    flex-shrink: 0;
    padding: 8px 12px;
    border-radius: 12px;
    background: #fff7df;
    color: #9a6b18;
    font-size: 13px;
    font-weight: 700;
}

.campaign-intro {
    margin: 8px 0 16px;
    color: #8b9099;
    font-size: 13px;
}

.campaign-categories {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.category-card {
    overflow: hidden;
    border: 1px solid #edf0f5;
    border-radius: 16px;
    background: #fbfcfe;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px 10px;
    cursor: pointer;
    list-style: none;
}

.category-header::-webkit-details-marker {
    display: none;
}

.category-header::after {
    content: "⌄";
    margin-left: 2px;
    color: #9da5b3;
    font-size: 18px;
    transition: transform 0.2s;
}

.category-card[open] .category-header::after {
    transform: rotate(180deg);
}

.category-emoji {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: #fff;
    font-size: 24px;
    box-shadow: 0 2px 8px rgba(45, 58, 82, 0.07);
}

.category-meta {
    min-width: 0;
    flex: 1;
}

.category-meta strong {
    display: block;
    color: #394150;
    font-size: 16px;
}

.category-meta span {
    display: block;
    margin-top: 2px;
    overflow: hidden;
    color: #9399a3;
    font-size: 12px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.category-stars {
    color: #a57924;
    font-size: 12px;
    font-weight: 700;
}

.difficulty-legend {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
    padding: 0 16px 8px;
    color: #a1a6af;
    font-size: 10px;
}

.difficulty-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

.difficulty-1 { background: #68b981; }
.difficulty-2 { background: #80a95b; }
.difficulty-3 { background: #d5a33d; }
.difficulty-4 { background: #e07a3f; }
.difficulty-5 { background: #cf5252; }

.level-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 7px;
    padding: 4px 14px 14px;
}

.level-btn {
    min-width: 0;
    padding: 9px 4px 7px;
    border: 1px solid #dfe6f5;
    border-radius: 11px;
    background: #fff;
    color: #4f648d;
    cursor: pointer;
    border-top-width: 3px;
}

.difficulty-border-1 { border-top-color: #68b981; }
.difficulty-border-2 { border-top-color: #80a95b; }
.difficulty-border-3 { border-top-color: #d5a33d; }
.difficulty-border-4 { border-top-color: #e07a3f; }
.difficulty-border-5 { border-top-color: #cf5252; }

.level-btn:hover:not(:disabled) {
    border-color: #6f91df;
    transform: translateY(-1px);
}

.level-btn:disabled {
    border-color: #eceef2;
    background: #f1f2f4;
    color: #adb1b8;
    cursor: not-allowed;
}

.level-number {
    display: block;
    font-size: 13px;
    font-weight: 700;
}

.level-stars {
    display: block;
    min-height: 14px;
    margin-top: 3px;
    color: #f0aa24;
    font-size: 9px;
    letter-spacing: -1px;
}

.level-difficulty {
    display: block;
    margin-top: 2px;
    font-size: 9px;
    font-weight: 600;
}

.difficulty-text-1 { color: #4c9462; }
.difficulty-text-2 { color: #718f43; }
.difficulty-text-3 { color: #aa7c20; }
.difficulty-text-4 { color: #bd6130; }
.difficulty-text-5 { color: #b33f3f; }

.level-lock {
    display: block;
    min-height: 14px;
    margin-top: 3px;
    font-size: 10px;
}

.level-context {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: 12px;
    background: #f5f8ff;
}

.back-levels-btn {
    border: none;
    background: transparent;
    color: #597bc5;
    font-size: 12px;
    cursor: pointer;
}

.level-context-title {
    min-width: 0;
    text-align: right;
}

.level-context-title span,
.level-context-title strong {
    display: block;
}

.level-context-title span {
    color: #8995ae;
    font-size: 11px;
}

.level-context-title strong {
    overflow: hidden;
    color: #3f557e;
    font-size: 14px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.battle-panel {
    flex: 1;
}

.battle-hero {
    padding: 20px 18px;
    border-radius: 18px;
    background: linear-gradient(135deg, #eef3ff, #f6efff);
    text-align: center;
}

.battle-icon {
    display: block;
    margin-bottom: 8px;
    font-size: 34px;
}

.battle-hero h2 {
    color: #35476d;
    font-size: 22px;
}

.battle-hero p {
    margin-top: 7px;
    color: #7f89a0;
    font-size: 13px;
    line-height: 1.6;
}

.battle-primary-btn {
    width: 100%;
    margin-top: 16px;
    padding: 13px 16px;
    border: none;
    border-radius: 13px;
    background: linear-gradient(135deg, #7468df, #5b8def);
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
}

.battle-primary-btn:disabled {
    background: #c8ccd5;
    cursor: not-allowed;
}

.battle-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 18px 0;
    color: #a2a7b0;
    font-size: 12px;
}

.battle-divider::before,
.battle-divider::after {
    content: "";
    height: 1px;
    flex: 1;
    background: #eceef2;
}

.battle-join-row,
.battle-input-row {
    display: flex;
    gap: 9px;
}

.battle-join-row input,
.battle-input-row input {
    min-width: 0;
    flex: 1;
    padding: 12px 14px;
    border: 2px solid #e5e8ef;
    border-radius: 12px;
    outline: none;
    font-size: 15px;
}

.battle-join-row input {
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-weight: 700;
}

.battle-join-row input:focus,
.battle-input-row input:focus {
    border-color: #758fdb;
}

.battle-join-row button,
.battle-input-row button {
    padding: 11px 22px;
    border: none;
    border-radius: 12px;
    background: #5b78c7;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
}

.battle-input-row button:disabled {
    background: #c5c9d1;
    cursor: not-allowed;
}

.battle-room-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    padding: 13px 14px;
    border-radius: 14px;
    background: #f4f6fb;
}

.battle-room-header > div {
    flex: 1;
}

.battle-room-label {
    display: block;
    color: #9a9fab;
    font-size: 10px;
}

#battle-room-code {
    color: #435b93;
    font-size: 22px;
    letter-spacing: 3px;
}

.battle-status-badge {
    padding: 5px 9px;
    border-radius: 10px;
    background: #fff1cf;
    color: #946614;
    font-size: 11px;
    font-weight: 700;
}

.battle-leave-btn {
    border: none;
    background: transparent;
    color: #a06464;
    font-size: 12px;
    cursor: pointer;
}

.battle-player-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.battle-live-grid {
    display: grid;
    grid-template-columns: 270px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

.battle-live-grid.waiting {
    grid-template-columns: 1fr;
}

.battle-live-grid:not(.waiting) .battle-player-list {
    grid-template-columns: 1fr;
}

.battle-sidebar,
.battle-arena {
    min-width: 0;
}

.battle-section-title {
    margin: 0 0 7px;
    color: #8b92a1;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.battle-player-card {
    min-width: 0;
    padding: 13px;
    border: 1px solid #e8ebf1;
    border-radius: 14px;
    background: #fff;
}

.battle-player-card.self {
    border-color: #9cb3e9;
    background: #f7f9ff;
}

.battle-player-card.empty {
    display: grid;
    place-items: center;
    min-height: 88px;
    border-style: dashed;
    color: #afb3bc;
    font-size: 12px;
}

.battle-player-name {
    overflow: hidden;
    color: #424956;
    font-size: 14px;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.battle-player-tags {
    color: #8a94aa;
    font-size: 10px;
    font-weight: 500;
}

.battle-player-score {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: 10px;
    color: #7b818d;
    font-size: 11px;
}

.battle-player-score strong {
    color: #5374bd;
    font-size: 15px;
}

.battle-waiting {
    margin-top: 16px;
    text-align: center;
}

.battle-waiting p {
    color: #858b96;
    font-size: 12px;
}

.battle-arena {
    margin-top: 0;
    padding: 14px;
    border: 1px solid #eceef3;
    border-radius: 14px;
    background: #fcfcfd;
}

.battle-timer {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
    margin-bottom: 12px;
    color: #8b92a1;
    font-size: 11px;
}

.battle-timer strong {
    color: #d45b5b;
    font-size: 28px;
}

.battle-result {
    margin-bottom: 12px;
    padding: 13px;
    border-radius: 12px;
    background: #eef7ef;
    color: #337347;
    font-size: 14px;
    font-weight: 700;
    line-height: 1.6;
    text-align: center;
}

.battle-rematch-btn {
    width: 100%;
    margin-bottom: 12px;
    padding: 12px 14px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #7468df, #5b8def);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
}

.battle-rematch-btn:disabled {
    background: #c6cad2;
    cursor: not-allowed;
}

.battle-history {
    display: flex;
    flex-direction: column;
    gap: 7px;
    max-height: min(230px, 30vh);
    margin-top: 0;
    padding: 10px;
    overflow-y: auto;
    border-radius: 12px;
    background: #fafafa;
}

.battle-history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    border-radius: 9px;
    background: #fff;
    color: #4e5560;
    font-size: 13px;
}

.stats {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.stat-item {
    flex: 1;
    background: #f8f9fa;
    border-radius: 14px;
    padding: 16px 14px;
    text-align: center;
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.stat-label {
    font-size: 14px;
    color: #888;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
}

.stat-value.current {
    color: #5b8def;
}

.stat-value.count {
    color: #4caf50;
}

.sort-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 10px;
}

.sort-label {
    font-size: 13px;
    color: #999;
}

.sort-btn {
    padding: 4px 12px;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    background: #fff;
    font-size: 12px;
    color: #888;
    cursor: pointer;
    transition: all 0.2s;
}

.sort-btn.active {
    background: #5b8def;
    border-color: #5b8def;
    color: #fff;
}

.sort-btn:hover:not(.active) {
    border-color: #5b8def;
    color: #5b8def;
}

.history {
    flex: 1;
    background: #fafafa;
    border-radius: 14px;
    padding: 14px 16px;
    margin-bottom: 20px;
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-placeholder {
    text-align: center;
    color: #ccc;
    font-size: 15px;
    padding: 40px 0;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    border-radius: 10px;
    background: #fff;
    border-bottom: 1px solid #f0f0f0;
}

.history-item.latest {
    background: #eef3ff;
    border-left: 3px solid #5b8def;
    padding-left: 9px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.history-word {
    font-size: 16px;
    font-weight: 500;
    color: #444;
}

.history-similarity {
    font-size: 15px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 8px;
    min-width: 80px;
    text-align: center;
}

.sim-high {
    background: #e8f5e9;
    color: #2e7d32;
}

.sim-mid {
    background: #fff3e0;
    color: #e65100;
}

.sim-low {
    background: #ffebee;
    color: #c62828;
}

.sim-zero {
    background: #f5f5f5;
    color: #999;
}

.input-area {
    display: flex;
    gap: 10px;
    margin-bottom: 14px;
}

.round-result {
    display: none;
    margin: -6px 0 16px;
    padding: 12px 14px;
    border-radius: 12px;
    background: #eef3ff;
    color: #3559a8;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
}

.round-result.show {
    display: block;
}

.round-result.success {
    background: #e8f5e9;
    color: #2e7d32;
}

.input-area input {
    flex: 1;
    padding: 14px 18px;
    border: 2px solid #e8e8e8;
    border-radius: 14px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
}

.input-area input:focus {
    border-color: #7c9aef;
}

.guess-btn {
    padding: 14px 28px;
    background: linear-gradient(135deg, #7c9aef, #5b8def);
    color: #fff;
    border: none;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}

.guess-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(92, 142, 239, 0.35);
}

.guess-btn:active {
    transform: translateY(0);
}

.guess-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.game-actions {
    display: flex;
    gap: 10px;
}

.reset-btn,
.reveal-btn {
    flex: 1;
    padding: 12px;
    background: #fff;
    border: 2px solid #eee;
    border-radius: 14px;
    font-size: 14px;
    color: #888;
    cursor: pointer;
    transition: all 0.2s;
}

.reset-btn:hover,
.reveal-btn:hover {
    border-color: #ff8a80;
    color: #e53935;
}

.reveal-btn:disabled {
    color: #aaa;
    cursor: not-allowed;
}

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    justify-content: center;
    align-items: center;
    z-index: 100;
}

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

.modal {
    position: relative;
    background: #fff;
    border-radius: 20px;
    padding: 32px 28px;
    max-width: 420px;
    width: 90%;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.modal-x {
    position: absolute;
    top: 12px;
    right: 16px;
    border: none;
    background: none;
    color: #999;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
}

.auth-description {
    margin: -8px 0 20px;
    color: #888;
    font-size: 13px;
    text-align: center;
}

.auth-modal form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-modal label {
    margin-top: 4px;
    color: #555;
    font-size: 13px;
    font-weight: 600;
}

.auth-modal input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid #e8e8e8;
    border-radius: 12px;
    outline: none;
    font-size: 15px;
}

.auth-modal input:focus {
    border-color: #7c9aef;
}

.auth-error {
    min-height: 20px;
    color: #d14343;
    font-size: 13px;
}

.auth-form-actions {
    display: flex;
    gap: 10px;
}

.auth-submit,
.auth-register {
    flex: 1;
    padding: 11px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.auth-submit {
    border: none;
    background: #5b8def;
    color: #fff;
}

.auth-register {
    border: 1px solid #cdd8f5;
    background: #f7f9ff;
    color: #4a70ca;
}

.auth-submit:disabled,
.auth-register:disabled {
    opacity: 0.55;
    cursor: wait;
}

.modal h2 {
    font-size: 22px;
    margin-bottom: 18px;
    color: #333;
    text-align: center;
}

.modal ol {
    padding-left: 20px;
    color: #555;
    font-size: 14px;
    line-height: 2;
}

.modal ol strong {
    color: #c62828;
}

.close-btn {
    display: block;
    margin: 20px auto 0;
    padding: 12px 40px;
    background: #5b8def;
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}

.close-btn:hover {
    background: #4a7de0;
}

@keyframes celebrate {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.celebrate {
    animation: celebrate 0.5s ease 2;
}

/* Toast notification */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: #fff;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 15px;
    z-index: 200;
    animation: slideDown 0.3s ease, fadeOut 0.3s ease 2.5s forwards;
}

.toast.success {
    background: #43a047;
}

@keyframes slideDown {
    from { transform: translateX(-50%) translateY(-60px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes fadeOut {
    to { opacity: 0; }
}

@media (max-width: 480px) {
    .game-container {
        padding: 20px 16px;
        border-radius: 16px;
    }

    header h1 {
        font-size: 24px;
    }

    header {
        align-items: flex-start;
        gap: 12px;
    }

    .header-actions {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .info-btn,
    .auth-btn,
    .logout-btn {
        padding: 7px 10px;
        font-size: 12px;
    }

    .input-area {
        flex-direction: column;
    }

    .guess-btn {
        width: 100%;
    }

    .game-actions {
        flex-direction: column;
    }

    .auth-form-actions {
        flex-direction: column;
    }

    .category-header {
        padding-inline: 12px;
    }

    .level-grid {
        gap: 5px;
        padding-inline: 10px;
    }

    .level-btn {
        padding-inline: 2px;
    }

    .mode-switch {
        grid-template-columns: repeat(3, 1fr);
    }

    .mode-btn {
        padding-inline: 5px;
        font-size: 12px;
    }

    .battle-join-row,
    .battle-input-row {
        flex-direction: column;
    }

    .battle-join-row button,
    .battle-input-row button {
        width: 100%;
    }

    .battle-room-header {
        flex-wrap: wrap;
    }

    .battle-player-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .battle-live-grid,
    .battle-live-grid.waiting {
        grid-template-columns: 1fr;
    }

    .battle-live-grid:not(.waiting) .battle-player-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .battle-player-card {
        padding: 10px;
    }

    .battle-player-score {
        flex-direction: column;
        gap: 2px;
    }

    .game-container.battle-layout {
        padding: 18px 14px;
    }

    .battle-history {
        max-height: min(180px, 26vh);
    }
}