:root {
    --paper-color: #f0e6d2;
    --ink-color: #2b2b2b;
    --red-ink: #8b0000;
    --highlight-color: #d4af37;
    --font-main: 'Ma Shan Zheng', cursive;
    --font-body: 'Noto Serif TC', serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body,
html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #1a1a1a;
    font-family: var(--font-body);
}

#app {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: #1a1a1a;
    overflow: hidden;
}

#game-area {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: calc(100% - 100px);
    z-index: 1;
    overflow: hidden;
}

.ad-space {
    position: absolute;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    z-index: 100;
    pointer-events: none;
}

.ad-space>* {
    pointer-events: auto;
}

.ad-left {
    top: 0;
    left: 0;
    width: 160px;
    height: calc(100% - 100px);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.ad-right {
    top: 0;
    right: 0;
    width: 160px;
    height: calc(100% - 100px);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
}

.ad-bottom {
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

#paper-texture {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--paper-color);
    background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiPjxmaWx0ZXIgaWQ9Im4iPjxmZVR1cmJ1bGVuY2UgdHlwZT0iZnJhY3RhbE5vaXNlIiBiYXNlRnJlcXVlbmN5PSIwLjUiIG51bU9jdGF2ZXM9IjMiIHN0aXRjaFRpbGVzPSJzdGl0Y2giLz48L2ZpbHRlcj48cmVjdCB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiBmaWxsPSIjZjBlNmQyIi8+PHJlY3Qgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgZmlsdGVyPSJ1cmwoI24pIiBvcGFjaXR5PSIwLjEiLz48L3N2Zz4=');
    z-index: 0;
    box-shadow: inset 0 0 100px rgba(0, 0, 0, 0.5);
}

#board {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
}

.char-item {
    position: absolute;
    font-family: var(--font-main);
    color: var(--ink-color);
    opacity: 0.7;
    cursor: default;
    transition: color 0.3s, transform 0.3s;
    white-space: nowrap;
}

.char-item.active {
    color: var(--red-ink);
    transform: scale(1.2);
    text-shadow: 0 0 5px rgba(139, 0, 0, 0.5);
    opacity: 1;
    z-index: 10;
}

#pointer {
    position: absolute;
    width: 40px;
    height: 40px;
    border: 2px solid var(--red-ink);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    z-index: 20;
    pointer-events: none;
    box-shadow: 0 0 15px var(--red-ink);
    transition: transform 0.1s linear;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pointer-inner {
    width: 10px;
    height: 10px;
    background-color: var(--red-ink);
    border-radius: 50%;
}

#controls {
    position: fixed;
    bottom: 130px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 150;
    width: 90%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.8);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid #d4af37;
    display: flex;
    flex-direction: column;
    gap: 10px;
    backdrop-filter: blur(5px);
    transition: background 0.5s, border-color 0.5s, box-shadow 0.5s, backdrop-filter 0.5s;
}

#controls.indicating {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    backdrop-filter: none;
    pointer-events: none;
}

#controls.indicating .status-text {
    text-shadow: 0 0 8px rgba(240, 230, 210, 1), 0 0 4px rgba(240, 230, 210, 1);
    font-weight: bold;
}

#controls.indicating .input-group,
#controls.indicating .mode-selector,
#controls.indicating .config-controls {
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
}

.input-group,
.mode-selector,
.config-controls {
    transition: all 0.5s ease;
    transform: translateY(0);
    opacity: 1;
}

.input-group {
    display: flex;
    gap: 10px;
}

#question-input {
    flex: 1;
    padding: 10px;
    font-size: 1.1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: var(--font-body);
    background: transparent;
    border-bottom: 2px solid var(--ink-color);
    border-top: none;
    border-left: none;
    border-right: none;
    outline: none;
}

#question-input:focus {
    border-bottom-color: var(--red-ink);
}

#ask-btn {
    padding: 10px 20px;
    font-size: 1.1rem;
    background-color: var(--red-ink);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-main);
    transition: background 0.3s;
}

#ask-btn:hover {
    background-color: #600000;
}

#ask-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.status-text {
    text-align: center;
    font-family: var(--font-main);
    font-size: 1.2rem;
    color: var(--ink-color);
    min-height: 1.5em;
}

.config-controls {
    position: absolute;
    right: 10px;
    top: -40px;
}

#menu-btn {
    background: rgba(255, 255, 255, 0.8);
    border: 2px solid var(--ink-color);
    padding: 5px 10px;
    border-radius: 4px;
    font-family: var(--font-main);
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--ink-color);
    transition: all 0.3s;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

#menu-btn:hover {
    background: var(--ink-color);
    color: var(--paper-color);
}

.mode-selector {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
    font-family: var(--font-main);
    color: var(--ink-color);
    font-size: 1.2rem;
}

.mode-selector label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
}

.mode-selector input[type="radio"] {
    accent-color: var(--red-ink);
}

.side-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 350px;
    height: 100%;
    background: var(--paper-color);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
    z-index: 200;
    transform: translateX(0);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    border-left: 2px solid var(--ink-color);
}

.side-menu.hidden {
    transform: translateX(100%);
    display: flex !important;
}

.menu-header {
    padding: 20px;
    border-bottom: 2px solid var(--ink-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.05);
}

.menu-header h2 {
    font-family: var(--font-main);
    color: var(--red-ink);
    margin: 0;
}

#close-menu-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--ink-color);
    cursor: pointer;
    line-height: 1;
}

.menu-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.menu-section {
    margin-bottom: 30px;
}

.menu-section h3 {
    font-family: var(--font-main);
    color: var(--ink-color);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 5px;
    margin-bottom: 15px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.history-item {
    background: rgba(255, 255, 255, 0.5);
    padding: 10px;
    border-radius: 4px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.history-time {
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 5px;
}

.history-q {
    font-weight: bold;
    color: var(--ink-color);
    margin-bottom: 5px;
}

.history-a {
    color: var(--red-ink);
    font-family: var(--font-main);
    font-size: 1.1rem;
}

.empty-history {
    text-align: center;
    color: #999;
    font-style: italic;
    padding: 20px;
}

.menu-divider {
    height: 1px;
    background: var(--ink-color);
    opacity: 0.3;
    margin: 20px 0;
}

.setting-item {
    margin-bottom: 15px;
}

.setting-item label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

#menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 190;
    backdrop-filter: blur(2px);
}

#result-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(3px);
}

.result-content {
    background: var(--paper-color);
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 400px;
    text-align: center;
    border: 2px solid var(--ink-color);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

#result-text {
    font-family: var(--font-main);
    font-size: 2rem;
    color: var(--red-ink);
    margin: 20px 0;
    line-height: 1.5;
    word-break: break-all;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#close-result-btn {
    background-color: var(--red-ink);
    color: #f0e6d2;
    border: 2px solid #600000;
    padding: 10px 30px;
    font-size: 1.5rem;
    font-family: var(--font-main);
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(139, 0, 0, 0.4);
    transition: all 0.3s ease;
    margin-top: 20px;
    position: relative;
    overflow: hidden;
}

#close-result-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 15px rgba(139, 0, 0, 0.6);
    background-color: #a00000;
}

#close-result-btn::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    right: 2px;
    bottom: 2px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    pointer-events: none;
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    #game-area {
        height: 100%;
    }

    .ad-space {
        display: none;
    }

    #controls {
        bottom: 30px;
    }
}