/* ==============================================
   猜数字游戏 v2.0 - 双页面布局样式
   移动优先，专业游戏体验
============================================== */

/* === 基础样式 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4285f4;
    --primary-dark: #3367d6;
    --secondary-color: #34a853;
    --warning-color: #fbbc04;
    --danger-color: #ea4335;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.2);
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;
}

body {
    font-family: 'Google Sans', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
}

/* === 应用容器 === */
.app-container {
    width: 100%;
    min-height: 100vh;
    position: relative;
}

.page-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100vh;
    opacity: 0;
    visibility: hidden;
    transform: translateX(100%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-container.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* === 主菜单页面 === */
.main-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.menu-header {
    text-align: center;
    margin-bottom: 2rem;
}

.game-logo-large {
    margin-bottom: 2rem;
}

.logo-image {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: var(--shadow-heavy);
    margin-bottom: 1rem;
}

.game-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.game-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

.menu-content {
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* === 难度选择卡片 === */
.difficulty-selection h3 {
    color: white;
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    font-weight: 500;
}

.difficulty-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.difficulty-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-medium);
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.difficulty-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.difficulty-card.active {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
}

.difficulty-card.active .card-icon,
.difficulty-card.active .card-title,
.difficulty-card.active .card-desc {
    color: var(--text-primary);
}

.card-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
    color: white;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: white;
}

.card-desc {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

/* === 游戏选项 === */
.game-options {
    display: flex;
    justify-content: center;
}

.option-toggle {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.option-toggle input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    width: 50px;
    height: 26px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 13px;
    position: relative;
    transition: background 0.3s ease;
    margin-right: 0.75rem;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-light);
}

.option-toggle input:checked + .toggle-slider {
    background: var(--primary-color);
}

.option-toggle input:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.toggle-label {
    color: white;
    font-size: 1rem;
    font-weight: 500;
}

/* === 开始游戏按钮 === */
.btn-start-game {
    background: linear-gradient(135deg, var(--secondary-color), #2e7d32);
    color: white;
    border: none;
    border-radius: var(--radius-medium);
    padding: 1rem 2rem;
    font-size: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-medium);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-start-game:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
    background: linear-gradient(135deg, #2e7d32, var(--secondary-color));
}

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

.btn-icon {
    font-size: 1.25em;
}

/* === 菜单操作按钮 === */
.menu-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.menu-btn {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-medium);
    padding: 1rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.menu-btn .btn-icon {
    font-size: 1.5rem;
}

.menu-btn .btn-text {
    font-size: 0.9rem;
}

/* === 游戏页面 === */
.game-screen {
    background: var(--background-color);
    display: flex;
    flex-direction: column;
}

.game-header {
    background: var(--surface-color);
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.btn-back,
.btn-menu {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--background-color);
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-back:hover,
.btn-menu:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.game-status {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.round-info {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.round-number {
    color: var(--primary-color);
}

.timer-display {
    background: var(--danger-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-small);
    font-weight: 600;
    font-size: 1rem;
    min-width: 80px;
    text-align: center;
}

.timer-display.warning {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* === 游戏主体 === */
.game-main {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
}

/* === 输入区域 === */
.input-section {
    background: var(--surface-color);
    border-radius: var(--radius-large);
    padding: 1.5rem;
    box-shadow: var(--shadow-medium);
}

.input-container {
    position: relative;
    margin-bottom: 1.5rem;
}

#guessInput {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.5rem;
    text-align: center;
    letter-spacing: 0.5rem;
    border: 3px solid var(--border-color);
    border-radius: var(--radius-medium);
    background: var(--background-color);
    color: var(--text-primary);
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
}

#guessInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.2);
}

.action-buttons {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
}

.btn-primary,
.btn-secondary {
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--radius-medium);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 56px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-light);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: var(--background-color);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

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

/* === 反馈区域 === */
.feedback-section {
    background: var(--surface-color);
    border-radius: var(--radius-large);
    padding: 1.5rem;
    box-shadow: var(--shadow-light);
    text-align: center;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.current-feedback {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.current-feedback.error {
    color: var(--danger-color);
    font-weight: 600;
}

.current-feedback.success {
    color: var(--secondary-color);
    font-weight: 600;
}

.feedback-numbers {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.feedback-description {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* === 历史记录 === */
.history-section {
    background: var(--surface-color);
    border-radius: var(--radius-large);
    padding: 1.5rem;
    box-shadow: var(--shadow-light);
}

.history-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-align: center;
}

.guess-history {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--background-color);
    border-radius: var(--radius-small);
    border: 1px solid var(--border-color);
}

.history-guess {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.2rem;
    color: var(--text-primary);
}

.history-feedback {
    display: flex;
    align-items: center;
}

.history-numbers {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    background: rgba(66, 133, 244, 0.1);
    border-radius: var(--radius-small);
}

/* === 数字网格 === */
.number-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.number-grid > div {
    background: var(--surface-color);
    border-radius: var(--radius-large);
    padding: 1.5rem;
    width: 100%;
    max-width: 350px;
    box-shadow: var(--shadow-heavy);
}

.grid-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.grid-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.grid-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--border-color);
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.grid-close:hover {
    background: var(--danger-color);
    color: white;
}

.grid-numbers {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.number-btn {
    width: 100%;
    height: 60px;
    border: 2px solid var(--border-color);
    background: var(--background-color);
    border-radius: var(--radius-medium);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.number-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.number-btn.selected {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    color: white !important;
    border-color: var(--primary-color) !important;
    box-shadow: var(--shadow-medium) !important;
}

.number-btn.disabled {
    background: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.5;
}

.number-btn.disabled:hover {
    transform: none;
}

.number-btn.touching {
    background: var(--primary-dark);
    color: white;
    border-color: var(--primary-dark);
    transform: scale(1.05);
}

.grid-actions {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

.grid-btn {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    background: var(--background-color);
    border-radius: var(--radius-small);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.grid-confirm {
    background: var(--primary-color) !important;
    color: white !important;
    border-color: var(--primary-color) !important;
}

/* === 覆盖菜单 === */
.overlay-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.overlay-menu .menu-content {
    background: var(--surface-color);
    border-radius: var(--radius-large);
    padding: 2rem;
    text-align: center;
    min-width: 280px;
    box-shadow: var(--shadow-heavy);
}

.overlay-menu h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.overlay-menu .menu-btn {
    width: 100%;
    margin-bottom: 1rem;
    background: var(--background-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 1rem;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.overlay-menu .menu-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* === 模态框 === */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--surface-color);
    margin: 5% auto;
    padding: 2rem;
    border-radius: var(--radius-large);
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-heavy);
    position: relative;
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
    line-height: 1;
    margin-top: -0.5rem;
}

.close:hover {
    color: var(--danger-color);
}

/* === 保留旧版本兼容性样式 === */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-info {
    background: var(--primary-color);
    color: white;
}

.btn-warning {
    background: var(--warning-color);
    color: var(--text-primary);
}

/* === 排行榜样式 === */
.leaderboard-tabs,
.difficulty-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
    gap: 0.5rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--background-color);
    color: var(--text-secondary);
    border-radius: var(--radius-small);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.leaderboard-list {
    min-height: 200px;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--radius-small);
    margin-bottom: 0.5rem;
    border: 1px solid var(--border-color);
}

.leaderboard-rank {
    font-weight: 600;
    min-width: 60px;
}

.leaderboard-name {
    flex: 1;
    text-align: left;
    margin-left: 1rem;
}

.leaderboard-score {
    font-weight: 600;
    color: var(--primary-color);
}

.empty-leaderboard {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-style: italic;
}

.loading-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* === 胜利和认输模态框 === */
.win-modal,
.surrender-modal {
    text-align: center;
}

.win-modal h2,
.surrender-modal h2 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.surrender-modal h2 {
    color: var(--danger-color);
}

.answer-reveal {
    background: var(--background-color);
    padding: 1rem;
    border-radius: var(--radius-medium);
    margin: 1rem 0;
    border: 2px solid var(--primary-color);
}

.answer-reveal span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.5rem;
}

.name-input {
    margin: 1.5rem 0;
}

.name-input label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}

.name-input input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-medium);
    font-size: 1rem;
    margin-bottom: 1rem;
    transition: border-color 0.3s ease;
}

.name-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* === 游戏规则样式 === */
.rules-content h3 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem 0;
    font-size: 1.2rem;
}

.rules-content ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.rules-content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.rules-content p {
    line-height: 1.6;
    margin-bottom: 1rem;
}

.rules-content strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* === 移动端优化 === */
@media (max-width: 768px) {
    .main-menu {
        padding: 1.5rem 1rem;
    }
    
    .logo-image {
        width: 100px;
        height: 100px;
    }
    
    .game-title {
        font-size: 2rem;
    }
    
    .difficulty-cards {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .difficulty-card {
        display: flex;
        align-items: center;
        text-align: left;
        gap: 1rem;
        padding: 1.25rem;
        min-height: 70px;
    }
    
    .card-icon {
        font-size: 2.5rem;
        margin-bottom: 0;
        flex-shrink: 0;
    }
    
    .card-content {
        flex: 1;
    }
    
    .btn-start-game {
        padding: 1.25rem 2rem;
        font-size: 1.1rem;
        min-height: 60px;
    }
    
    .menu-actions {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .menu-btn {
        padding: 1.25rem 1rem;
        min-height: 80px;
    }
    
    .game-main {
        padding: 1rem 0.75rem;
        gap: 1.25rem;
    }
    
    .input-section,
    .feedback-section,
    .history-section {
        padding: 1rem;
    }
    
    #guessInput {
        font-size: 1.75rem;
        padding: 1.25rem 1rem;
        letter-spacing: 0.25rem;
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .btn-primary,
    .btn-secondary {
        min-height: 56px;
        font-size: 1.1rem;
        padding: 1rem 1.5rem;
    }
    
    .number-btn {
        height: 70px;
        font-size: 1.75rem;
        min-width: 70px;
    }
    
    .grid-numbers {
        gap: 1.25rem;
    }
    
    .number-grid > div {
        padding: 1.25rem;
        max-width: 320px;
    }
    
    .modal-content {
        margin: 2% auto;
        padding: 1.5rem;
        width: 95%;
    }
    
    .game-header {
        padding: 0.75rem 1rem;
    }
    
    .btn-back,
    .btn-menu {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }
    
    .round-info {
        font-size: 1rem;
    }
    
    .timer-display {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
        min-width: 70px;
    }
    
    .feedback-numbers {
        font-size: 1.75rem;
    }
    
    .history-item {
        padding: 1rem;
    }
    
    .history-guess {
        font-size: 1.25rem;
        letter-spacing: 0.15rem;
    }
    
    .history-numbers {
        font-size: 1.25rem;
        padding: 0.4rem 0.8rem;
    }
}

@media (max-width: 480px) {
    .main-menu {
        padding: 1rem 0.75rem;
    }
    
    .game-title {
        font-size: 1.75rem;
    }
    
    .game-subtitle {
        font-size: 1rem;
    }
    
    .logo-image {
        width: 80px;
        height: 80px;
    }
    
    .difficulty-card {
        padding: 1rem;
        min-height: 60px;
    }
    
    .card-icon {
        font-size: 2rem;
    }
    
    .card-title {
        font-size: 0.9rem;
    }
    
    .card-desc {
        font-size: 0.8rem;
    }
    
    .btn-start-game {
        padding: 1rem 1.5rem;
        font-size: 1rem;
        min-height: 52px;
    }
    
    .menu-actions {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .menu-btn {
        padding: 1rem;
        min-height: 60px;
        flex-direction: row;
        gap: 0.75rem;
    }
    
    .menu-btn .btn-icon {
        font-size: 1.25rem;
    }
    
    .menu-btn .btn-text {
        font-size: 0.85rem;
    }
    
    .game-main {
        padding: 0.75rem 0.5rem;
        gap: 1rem;
    }
    
    .input-section,
    .feedback-section,
    .history-section {
        padding: 0.75rem;
    }
    
    #guessInput {
        font-size: 1.5rem;
        letter-spacing: 0.2rem;
        padding: 1rem 0.75rem;
    }
    
    .btn-primary,
    .btn-secondary {
        min-height: 48px;
        font-size: 1rem;
        padding: 0.75rem 1rem;
    }
    
    .number-btn {
        height: 65px;
        font-size: 1.5rem;
        min-width: 65px;
    }
    
    .grid-numbers {
        gap: 1rem;
    }
    
    .number-grid > div {
        padding: 1rem;
        max-width: 300px;
    }
    
    .grid-title {
        font-size: 1.1rem;
    }
    
    .grid-btn {
        padding: 0.6rem;
        font-size: 0.8rem;
    }
    
    .game-header {
        padding: 0.5rem 0.75rem;
    }
    
    .btn-back,
    .btn-menu {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }
    
    .round-info {
        font-size: 0.9rem;
    }
    
    .timer-display {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
        min-width: 60px;
    }
    
    .current-feedback {
        font-size: 1.1rem;
    }
    
    .feedback-numbers {
        font-size: 1.5rem;
    }
    
    .feedback-description {
        font-size: 0.9rem;
    }
    
    .history-title {
        font-size: 1rem;
    }
    
    .history-item {
        padding: 0.75rem;
    }
    
    .history-guess {
        font-size: 1.1rem;
        letter-spacing: 0.1rem;
    }
    
    .history-numbers {
        font-size: 1.1rem;
        padding: 0.3rem 0.6rem;
    }
    
    .modal-content {
        margin: 1% auto;
        padding: 1rem;
        width: 98%;
    }
    
    .close {
        font-size: 1.5rem;
        margin-top: -0.25rem;
    }
}

/* === 超小屏幕优化 (320px及以下) === */
@media (max-width: 320px) {
    .game-title {
        font-size: 1.5rem;
    }
    
    .logo-image {
        width: 70px;
        height: 70px;
    }
    
    .difficulty-card {
        padding: 0.75rem;
        min-height: 50px;
    }
    
    .card-icon {
        font-size: 1.75rem;
    }
    
    .btn-start-game {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        min-height: 48px;
    }
    
    .game-main {
        padding: 0.5rem 0.25rem;
    }
    
    #guessInput {
        font-size: 1.25rem;
        letter-spacing: 0.15rem;
        padding: 0.75rem 0.5rem;
    }
    
    .number-btn {
        height: 55px;
        font-size: 1.25rem;
        min-width: 55px;
    }
    
    .number-grid > div {
        padding: 0.75rem;
        max-width: 280px;
    }
}

/* === 横屏模式优化 === */
@media (max-height: 500px) and (orientation: landscape) {
    .main-menu {
        padding: 0.75rem;
    }
    
    .logo-image {
        width: 60px;
        height: 60px;
    }
    
    .game-title {
        font-size: 1.5rem;
        margin-bottom: 0.25rem;
    }
    
    .game-subtitle {
        font-size: 0.9rem;
    }
    
    .menu-content {
        gap: 1rem;
    }
    
    .difficulty-cards {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }
    
    .difficulty-card {
        padding: 0.75rem;
        min-height: auto;
        flex-direction: column;
        text-align: center;
    }
    
    .card-icon {
        font-size: 1.5rem;
        margin-bottom: 0.25rem;
    }
    
    .btn-start-game {
        padding: 0.75rem 1.5rem;
        min-height: 44px;
    }
    
    .menu-actions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .menu-btn {
        padding: 0.75rem;
        min-height: 50px;
        flex-direction: row;
    }
}

/* === 触摸友好性优化 === */
@media (hover: none) and (pointer: coarse) {
    /* 移动设备特定优化 */
    .difficulty-card {
        min-height: 70px;
        padding: 1.25rem;
    }
    
    .difficulty-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    .btn-start-game:active {
        transform: scale(0.98);
    }
    
    .menu-btn:active {
        transform: scale(0.98);
    }
    
    .btn-primary:active,
    .btn-secondary:active {
        transform: scale(0.98);
    }
    
    .number-btn:active {
        transform: scale(0.95);
    }
    
    .btn-back:active,
    .btn-menu:active {
        transform: scale(0.95);
    }
    
    /* 增加触摸目标大小 */
    .number-btn {
        min-width: 70px;
        min-height: 70px;
    }
    
    .btn-back,
    .btn-menu {
        min-width: 48px;
        min-height: 48px;
    }
    
    .grid-close {
        min-width: 44px;
        min-height: 44px;
    }
    
    .close {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* 优化输入框触摸体验 */
    #guessInput {
        min-height: 60px;
        -webkit-tap-highlight-color: rgba(66, 133, 244, 0.2);
    }
    
    /* 防止意外缩放 */
    input, textarea, select {
        font-size: 16px;
    }
}

/* === 高分辨率屏幕优化 === */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo-image {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
    
    .game-title {
        text-rendering: optimizeLegibility;
    }
}

/* === 减少动画 (用户偏好) === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .page-container {
        transition: none;
    }
    
    .difficulty-card,
    .btn-start-game,
    .menu-btn,
    .btn-primary,
    .btn-secondary,
    .number-btn {
        transition: none;
    }
}