:root {
    --bg-main: #f0f4f8;
    --bg-container: #ffffff;
    --bg-input: #f8f9fa;
    --bg-room: #f2f3f5;
    --bg-grid: #b9bbbe;

    --text-main: #333;
    --text-heading: #2c3e50;
    --text-muted: #b2bec3;
    --text-help: #444;

    --border-main: #e1e8ed;
    --border-input: #ecf0f1;
    --border-muted: #dfe6e9;

    --box-bg: white;
    --box-border: #aaa;
    --box-hover: #f8f8f8;
    --box-text: white;
    --box-error-bg: #2d3436;
    --box-error-text: #dfe6e9;
    --box-mark-error: #ff7675;

    --btn-primary: #0984e3;
    --btn-primary-hover: #74b9ff;
    --btn-create: #00b894;
    --btn-create-hover: #55efc4;
    --btn-danger: #ffcccc;
    --btn-danger-hover: #ffaaaa;
    --btn-float: #6c5ce7;
    --btn-float-hover: #a29bfe;

    --pip-bg: rgba(242, 243, 245, 0.85);
    --pip-header: rgba(255, 255, 255, 0.85);
    --pip-grid: rgba(185, 187, 190, 0.85);
    --prediction-bg: rgba(255, 255, 255, 0.9);

    --help-text-target: #2d3436;
}

[data-theme="dark"] {
    --bg-main: #18191c;
    --bg-container: #313338;
    --bg-input: #1e1f22;
    --bg-room: #2b2d31;
    --bg-grid: #1e1f22;

    --text-main: #dbdee1;
    --text-heading: #f2f3f5;
    --text-muted: #80848e;
    --text-help: #dbdee1;

    --border-main: #1e1f22;
    --border-input: #1e1f22;
    --border-muted: #4f545c;

    --box-bg: #313338;
    --box-border: #1e1f22;
    --box-hover: #3f4147;
    --box-text: #dbdee1;
    --box-error-bg: #1e1f22;
    --box-error-text: #949ba4;
    --box-mark-error: #f04747;

    --btn-primary: #5865f2;
    --btn-primary-hover: #4752c4;
    --btn-create: #23a559;
    --btn-create-hover: #1d8046;
    --btn-danger: #da373c;
    --btn-danger-hover: #a12828;
    --btn-float: #4f545c;
    --btn-float-hover: #3f4147;

    --pip-bg: rgba(43, 45, 49, 0.85);
    --pip-header: rgba(49, 51, 56, 0.85);
    --pip-grid: rgba(30, 31, 34, 0.85);
    --prediction-bg: rgba(49, 51, 56, 0.9);

    --help-text-target: #f2f3f5;
}

[data-theme="pink"] {
    --bg-main: #ffeaa7;
    --bg-container: #fff0f3;
    --bg-input: #ffe6ea;
    --bg-room: #fff0f3;
    --bg-grid: #ffb8b8;

    --text-main: #d63031;
    --text-heading: #e84393;
    --text-muted: #e66767;
    --text-help: #d63031;

    --border-main: #ffcccc;
    --border-input: #ffdae0;
    --border-muted: #ffcccc;

    --box-bg: #ffe6ea;
    --box-border: #ff7675;
    --box-hover: #fff;
    --box-text: #d63031;
    --box-error-bg: #d63031;
    --box-error-text: #fff;
    --box-mark-error: #ffeaa7;

    --btn-primary: #e84393;
    --btn-primary-hover: #fd79a8;
    --btn-create: #ff7675;
    --btn-create-hover: #fab1a0;
    --btn-danger: #d63031;
    --btn-danger-hover: #ff7675;
    --btn-float: #ff9ff3;
    --btn-float-hover: #f368e0;

    --pip-bg: rgba(255, 240, 243, 0.85);
    --pip-header: rgba(255, 255, 255, 0.85);
    --pip-grid: rgba(255, 184, 184, 0.85);
    --prediction-bg: rgba(255, 255, 255, 0.9);

    --help-text-target: #e84393;
}

[data-theme="blue"] {
    --bg-main: #15779E;
    --bg-container: #ffffff;
    --bg-input: #f0f7f9;
    --bg-room: #ffffff;
    --bg-grid: #cfe2eb;

    --text-main: #2c3e50;
    --text-heading: #15779E;
    --text-muted: #7fa1b5;
    --text-help: #15779E;

    --border-main: #b8d4e3;
    --border-input: #b8d4e3;
    --border-muted: #d6e6ef;

    --box-bg: #ffffff;
    --box-border: #15779E;
    --box-hover: #eaf3f8;
    --box-text: #15779E;
    --box-error-bg: #15779E;
    --box-error-text: #ffffff;
    --box-mark-error: #ff6b6b;

    --btn-primary: #15779E;
    --btn-primary-hover: #115f7e;
    --btn-create: #36a4c8;
    --btn-create-hover: #15779E;
    --btn-danger: #ff6b6b;
    --btn-danger-hover: #ff4757;
    --btn-float: #15779E;
    --btn-float-hover: #115f7e;

    --pip-bg: rgba(21, 119, 158, 0.85);
    --pip-header: rgba(255, 255, 255, 0.85);
    --pip-grid: rgba(207, 226, 235, 0.85);
    --prediction-bg: rgba(255, 255, 255, 0.9);

    --help-text-target: #15779E;
}

/* ============================== */
/* 切換主題按鈕 */
/* ============================== */
.theme-toggle-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    border-radius: 20px;
    background: var(--bg-container);
    color: var(--text-main);
    border: 2px solid var(--border-main);
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 2000;
    transition: 0.3s;
}

.theme-toggle-btn:hover {
    transform: scale(1.05);
}

/* ============================== */
/* 基礎與登入畫面樣式 */
/* ============================== */
body {
    font-family: "Microsoft JhengHei", sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

.app-wrapper {
    max-height: 100vh;
    overflow: hidden;
}

.login-container {
    background-color: var(--bg-container);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06);
    text-align: center;
    width: 350px;
    border: 1px solid var(--border-main);
    transition: 0.3s;
}

.login-container h1 {
    font-size: 26px;
    margin-bottom: 30px;
    color: var(--text-heading);
    font-weight: 900;
    letter-spacing: 1px;
    transition: color 0.3s;
}

.login-container h1 span {
    color: #fff;
    font-size: 13px;
    background: var(--btn-create);
    padding: 4px 10px;
    border-radius: 12px;
    vertical-align: middle;
    margin-left: 8px;
    font-weight: normal;
    letter-spacing: 0;
}

.input-group {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}

.input-group input {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-input);
    border-radius: 8px;
    font-size: 16px;
    margin-right: 10px;
    text-align: center;
    background-color: var(--bg-input);
    color: var(--text-main);
    transition: all 0.2s;
    outline: none;
}

.input-group input:focus {
    border-color: var(--btn-primary-hover);
    background-color: var(--bg-container);
    box-shadow: 0 0 0 3px rgba(116, 185, 255, 0.2);
}

.input-group input::placeholder {
    color: var(--text-muted);
    font-size: 14px;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    color: white;
    font-weight: bold;
    transition: all 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
}

.btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.08);
}

.btn-enter {
    background-color: var(--btn-primary);
    flex: 1;
}

.btn-enter:hover {
    background-color: var(--btn-primary-hover);
}

.btn-create {
    background-color: var(--btn-create);
    flex: 1;
}

.btn-create:hover {
    background-color: var(--btn-create-hover);
    color: var(--bg-container);
}

.or-divider {
    margin: 20px 0;
    font-size: 14px;
    color: var(--text-muted);
    position: relative;
    font-weight: bold;
}

.or-divider::before,
.or-divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background-color: var(--border-muted);
}

.or-divider::before {
    left: 0;
}

.or-divider::after {
    right: 0;
}

/* ============================== */
/* 準備視窗 (Modal) 樣式 */
/* ============================== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(3px);
}

.modal-content {
    background: var(--bg-container);
    padding: 30px;
    border-radius: 16px;
    width: 300px;
    text-align: center;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    color: var(--text-main);
    transition: 0.3s;
}

@keyframes popIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-content h2 {
    margin-top: 0;
    color: var(--text-heading);
    font-size: 22px;
    margin-bottom: 20px;
    transition: 0.3s;
}

.modal-group {
    margin-bottom: 15px;
    text-align: left;
}

.modal-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 14px;
}

.modal-group input[type="text"],
.modal-group select {
    color: var(--text-main);
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-input);
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    outline: none;
    transition: 0.2s;
    background-color: var(--bg-input);
}

.modal-group input[type="text"]:focus,
.modal-group select:focus {
    border-color: var(--btn-primary-hover);
    background-color: var(--bg-container);
}

.modal-group input[type="color"] {
    width: 100%;
    height: 45px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background: none;
    padding: 0;
}

.modal-group input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.modal-group input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* ============================== */
/* 房間內部畫面樣式 */
/* ============================== */
.room-container {
    display: none;
    background-color: var(--bg-room);
    color: var(--text-main);
    width: 100%;
    max-width: 600px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    flex-direction: column;
    transition: 0.3s;
}

.room-header {
    padding: 10px 15px;
    background-color: var(--bg-container);
    border-bottom: 1px dashed var(--border-main);
}

.top-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
    align-items: center;
}

.top-controls input[type="text"] {
    color: var(--text-main);
    background: var(--bg-input);
    border-color: var(--border-input);
    flex: 2;
    padding: 6px 8px;
    border-radius: 4px;
    min-width: 120px;
}

.top-controls button {
    color: var(--text-main);
    padding: 6px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    border-radius: 4px;
    cursor: pointer;
    transition: 0.2s;
}

.top-controls button:hover {
    background-color: var(--border-main);
}

.btn-leave {
    background-color: var(--btn-danger) !important;
    border-color: var(--btn-danger-hover) !important;
    color: white !important;
    margin-left: auto;
}

.btn-leave:hover {
    background-color: var(--btn-danger-hover) !important;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 14px;
    color: var(--text-muted);
    border: 1px solid var(--border-main);
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--bg-input);
}

select#symbol-picker {
    color: var(--text-main);
    border: none;
    outline: none;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    margin-right: 5px;
}

input[type="color"] {
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1);
}

.member-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 5px;
    padding: 2px 0;
}

.member-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 6px;
    color: white;
    border: 1px solid rgba(0, 0, 0, 0.1);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.path-panel {
    margin-top: 6px;
    padding: 7px 10px;
    border-radius: 10px;
    border: 1px solid var(--border-main);
    background: linear-gradient(120deg, rgba(255, 255, 255, 0.95), rgba(232, 243, 250, 0.95));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 2px 6px rgba(0, 0, 0, 0.05);
}

.path-panel-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 8px;
    margin-bottom: 5px;
}

.path-title {
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 1px;
    color: var(--text-heading);
}

.path-inline {
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    font-weight: 800;
    color: var(--btn-primary);
    background: rgba(21, 119, 158, 0.1);
    border: 1px solid rgba(21, 119, 158, 0.25);
    border-radius: 8px;
    padding: 2px 7px;
    min-height: 20px;
}

.path-levels {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.path-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 6px;
    border-radius: 999px;
    font-size: 10px;
    font-weight: 700;
    border: 1px solid var(--border-main);
    background: var(--bg-container);
    color: var(--text-main);
}

.path-chip strong {
    font-size: 11px;
    color: var(--btn-primary);
}

.path-chip.pending strong {
    color: var(--text-muted);
}

/* ============================== */
/* 踩箱子區域樣式 */
/* ============================== */
.grid-container {
    background-color: var(--bg-grid);
    padding: 8px 20px;
    display: flex;
    flex-direction: column;
    gap: 3px;
    transition: 0.3s;
}

.grid-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.row-label {
    width: 35px;
    text-align: right;
    font-weight: bold;
    color: var(--text-help);
    font-size: 15px;
}

.box {
    position: relative;
    flex: 1;
    height: 42px;
    background-color: var(--box-bg);
    border-radius: 6px;
    border: 2px solid var(--box-border);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding-top: 4px;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s, background-color 0.2s;
    box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.box::before {
    content: attr(data-col);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-size: 20px;
    font-weight: 800;
    color: var(--text-muted);
    opacity: 0.26;
    pointer-events: none;
    z-index: 0;
}

.box>* {
    position: relative;
    z-index: 1;
}

.box:hover {
    background-color: var(--box-hover);
    transform: translateY(-1px);
}

.box.locked {
    cursor: not-allowed;
    opacity: 0.6;
    filter: grayscale(0.12);
}

.box.locked:hover {
    background-color: var(--box-bg);
    transform: none;
}

.box.selected {
    border-color: transparent;
    color: white;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.box-mark {
    font-size: 18px;
    line-height: 1;
    margin-bottom: 3px;
}

.box-name {
    font-size: 11px;
    line-height: 1.2;
    width: 90%;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: inherit;
}

.box.error-box {
    background-color: var(--box-error-bg) !important;
    color: var(--box-error-text) !important;
    border-color: transparent;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
}

/* 底部清空按鈕區塊 */
.bottom-controls {
    padding: 8px 15px;
    background-color: var(--bg-container);
    border-top: 1px dashed var(--border-main);
    text-align: center;
}

.btn-clear {
    background-color: var(--box-mark-error);
    width: 100%;
    max-width: 250px;
    color: white;
    border: none;
    padding: 10px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
}

.btn-clear:hover {
    background-color: var(--btn-danger-hover);
}

.btn-clear:active {
    transform: translateY(2px);
    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.08);
}

/* ============================== */
/* 懸浮視窗模式樣式 */
/* ============================== */
.room-container.floating {
    position: fixed;
    top: 50px;
    left: 50px;
    width: 600px;
    max-width: 600px;
    z-index: 9999;
    background-color: var(--pip-bg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
    margin: 0 !important;
    backdrop-filter: blur(4px);
    /* 背景模糊化 */
}

.room-container.floating .room-header {
    background-color: var(--pip-header);
    cursor: move;
    /* 拖曳鼠標 */
}

.room-container.floating .grid-container {
    background-color: var(--pip-grid);
}

.room-container.floating .bottom-controls {
    background-color: var(--pip-header);
}

.btn-float {
    padding: 10px 15px;
    background-color: var(--btn-float);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
}

.btn-float:hover {
    background-color: var(--btn-float-hover);
}

.btn-float:active {
    transform: translateY(2px);
    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.08);
}

.btn-help {
    padding: 10px 15px;
    background-color: var(--btn-create);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
}

.btn-help:hover {
    background-color: var(--btn-create-hover);
    color: var(--text-main);
}

.btn-help:active {
    transform: translateY(2px);
    box-shadow: 0 2px 3px rgba(0, 0, 0, 0.08);
}

.help-content p {
    margin: 10px 0;
    color: var(--text-help);
}

.help-content strong {
    color: var(--help-text-target);
    font-size: 15px;
}

/* 動態預測動畫 */
@keyframes pulseGold {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 195, 18, 0.8);
        border-color: #f1c40f;
    }

    70% {
        box-shadow: 0 0 0 6px rgba(255, 195, 18, 0);
        border-color: #f39c12;
    }

    100% {
        box-shadow: 0 0 0 0 rgba(255, 195, 18, 0);
        border-color: #f1c40f;
    }
}

@keyframes pulseBlack {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.6);
        border-color: var(--text-main);
    }

    70% {
        box-shadow: 0 0 0 6px rgba(0, 0, 0, 0);
        border-color: var(--text-main);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
        border-color: var(--text-main);
    }
}

.box.predict-gold {
    border: 3px solid #f1c40f;
    animation: pulseGold 1.5s infinite;
    z-index: 5;
}

.box.predict-black {
    border: 3px solid var(--text-main);
    animation: pulseBlack 2s infinite;
    z-index: 4;
}

.prediction-container {
    position: absolute;
    top: 2px;
    right: 2px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    pointer-events: none;
    max-height: 100%;
    flex-wrap: wrap;
    align-items: flex-end;
}

.pred-badge {
    font-size: 10px;
    font-weight: bold;
    padding: 1px 3px;
    border-radius: 3px;
    background: var(--prediction-bg);
    color: var(--text-main);
    text-shadow: none;
    line-height: 1;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.pred-badge.gold {
    border: 1px solid #f1c40f;
}

.pred-badge.black {
    border: 1px solid var(--text-main);
}

/* ============================== */
/* 推薦連結樣式 (右下角) */
/* ============================== */
#promo-wrapper {
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

#promo-wrapper:hover {
    transform: translateY(-5px) scale(1.03);
}

.promo-link {
    background: linear-gradient(135deg, var(--btn-primary), var(--btn-float));
    color: white;
    padding: 12px 22px;
    border-radius: 50px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
    font-size: 14px;
    transition: box-shadow 0.3s, background 0.3s;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.promo-link:hover {
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.35);
    background: linear-gradient(135deg, var(--btn-primary-hover), var(--btn-float-hover));
}

.promo-close {
    position: absolute;
    top: -6px;
    right: -4px;
    width: 22px;
    height: 22px;
    background: #ff4757;
    color: white;
    border: 2px solid white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: 0.2s;
    z-index: 10;
    padding: 0;
    line-height: 1;
}

.promo-close:hover {
    transform: scale(1.15);
    background: #ff6b6b;
}

.promo-icon {
    font-size: 26px;
    animation: bounce 2s infinite;
}

.promo-text {
    display: flex;
    flex-direction: column;
}

.promo-text strong {
    font-size: 14px;
    line-height: 1.2;
}

.promo-text span {
    font-size: 12px;
    opacity: 0.9;
}

@keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-6px);
    }

    60% {
        transform: translateY(-3px);
    }
}

@media (max-width: 700px) {
    .room-container {
        border-radius: 0;
    }

    .path-panel-header {
        flex-wrap: wrap;
    }
}