:root {
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.2);
    --bg: #0a0c10;
    --card: #161b22;
    --text-p: #f0f6fc;
    --text-s: #8b949e;
    --border: #30363d;
    --success: #2ea043;
    --warning: #dbab09;
    --danger: #f85149;
    --reset: #f97316;
}

* { 
    box-sizing: border-box; 
    transition: all 0.2s ease; 
}

body {
    margin: 0; 
    font-family: 'Inter', sans-serif;
    background: var(--bg); 
    color: var(--text);
    /* 修改以下部分 */
    display: flex; 
    flex-direction: column; /* 纵向排列 */
    align-items: center;    /* 水平居中 */
    justify-content: flex-start; /* 从顶部开始 */
    min-height: 100vh;
    padding: 0; /* 移除默认内边距，方便导航栏置顶 */
}

.container {
    background: var(--card); 
    padding: 2.5rem; 
    border-radius: 24px;
    width: 95%; 
    max-width: 700px; 
    border: 1px solid var(--border);
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
}

/* 标题区域 */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    margin: 0 0 0.5rem 0;
    font-size: 1.8rem;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-s);
    font-size: 0.9rem;
    margin: 0;
}

/* 超大密码展示区 */
.hero-output {
    position: relative;
    background: #0d1117;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
}

#output {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.8rem;
    color: var(--text-p);
    word-break: break-all;
    text-align: center;
    padding: 0 2.5rem;
    letter-spacing: 1px;
    line-height: 1.4;
    user-select: text;
}

/* 图标复制按钮 */
.icon-copy-btn {
    position: absolute;
    right: 12px;
    top: 12px;
    background: transparent;
    border: none;
    color: var(--text-s);
    padding: 10px;
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
}
.icon-copy-btn:hover {
    background: var(--border);
    color: var(--accent);
}
.icon-copy-btn svg { 
    width: 22px; 
    height: 22px; 
}
.icon-copy-btn.copied { 
    color: var(--success); 
    background: rgba(46, 160, 67, 0.1);
    transform: scale(1.1); 
}
.icon-copy-btn.copied svg {
    animation: checkmark 0.3s ease;
}

@keyframes checkmark {
    0% { transform: scale(0.8); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* 强度指示器 */
.strength-track {
    position: absolute;
    bottom: 0; 
    left: 0; 
    right: 0;
    height: 4px;
    background: transparent;
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
    overflow: hidden;
}
#strength-bar { 
    height: 100%; 
    width: 0%; 
    transition: width 0.6s ease, background 0.3s; 
    background: linear-gradient(90deg, var(--danger), var(--warning), var(--success));
}

.strength-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 10px;
}

.strength-score {
    display: flex;
    align-items: center;
    gap: 10px;
}

#strength-text {
    font-size: 0.9rem;
    font-weight: 600;
}

#entropy-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-s);
    background: rgba(255,255,255,0.05);
    padding: 4px 8px;
    border-radius: 6px;
}

/* 配置项样式 */
.setting-row { 
    margin-bottom: 1.8rem; 
}

.label-box { 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    font-size: 0.9rem; 
    margin-bottom: 10px; 
}

.len-val { 
    color: var(--accent); 
    font-weight: 700; 
    font-family: 'JetBrains Mono';
    font-size: 1.1rem;
}

input[type="range"] {
    width: 100%; 
    appearance: none; 
    background: #21262d; 
    height: 8px; 
    border-radius: 4px; 
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none; 
    width: 24px; 
    height: 24px; 
    background: var(--accent); 
    border-radius: 50%; 
    cursor: pointer; 
    border: 4px solid var(--card);
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* 预设模式按钮组 */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 1.5rem;
}

.preset-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 8px;
    font-size: 0.8rem;
    color: var(--text-s);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.preset-btn:hover {
    border-color: var(--accent);
    color: var(--text-p);
    transform: translateY(-2px);
}

.preset-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* 生成按钮行 */
.generate-row {
    margin-bottom: 2rem;
    display: flex;
    gap: 15px;
    align-items: center;
}

.main-generate-btn {
    flex: 1;
    background: var(--accent);
    color: white; 
    border: none; 
    padding: 1.1rem 1.5rem; 
    border-radius: 14px;
    font-size: 1rem; 
    font-weight: 600; 
    cursor: pointer;
    box-shadow: 0 10px 20px var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: all 0.2s ease;
}

.main-generate-btn:hover { 
    filter: brightness(1.1); 
    transform: translateY(-2px); 
    box-shadow: 0 15px 25px var(--accent-glow);
}

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

.quick-generate-btn {
    background: rgba(255,255,255,0.05);
    color: var(--text-p);
    border: 1px solid var(--border);
    padding: 1rem 1.2rem;
    border-radius: 14px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.quick-generate-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* 字符选择器面板 */
.char-selector-container {
    background: rgba(255,255,255,0.03);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.char-selector-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.char-selector-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-p);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.char-selector-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.8rem;
    color: var(--text-s);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.char-selector-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--accent);
}

.char-selector-btn.reset {
    background: rgba(249, 115, 22, 0.1);
    border-color: var(--reset);
    color: var(--reset);
    font-weight: 600;
}

.char-selector-btn.reset:hover {
    background: rgba(249, 115, 22, 0.2);
    border-color: #fb923c;
}

.char-selector-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 10px;
    margin-bottom: 20px;
}

.char-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.05);
    border: 2px solid var(--border);
    border-radius: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    cursor: pointer;
    user-select: none;
    position: relative;
    transition: all 0.2s ease;
}

.char-item:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.2);
}

.char-item.excluded {
    opacity: 0.4;
    background: rgba(248, 81, 73, 0.1);
    border-color: var(--danger);
}

.char-item.excluded::after {
    content: '✕';
    position: absolute;
    top: -8px;
    right: -8px;
    width: 20px;
    height: 20px;
    background: var(--danger);
    color: white;
    border-radius: 50%;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.char-item.excluded:hover::after {
    background: #ff6b6b;
}

.char-category {
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
}

.char-category:last-child {
    margin-bottom: 0;
}

.char-category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.char-category-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-p);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    flex-grow: 1;
}

.char-category-actions {
    display: flex;
    gap: 8px;
    margin-left: 15px;
}

.category-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 10px;
    font-size: 0.75rem;
    color: var(--text-s);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.category-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--accent);
}

.category-btn.reset {
    background: rgba(249, 115, 22, 0.15);
    border-color: var(--reset);
    color: var(--reset);
    font-weight: 600;
    box-shadow: 0 0 10px rgba(249, 115, 22, 0.2);
}

.category-btn.reset:hover {
    background: rgba(249, 115, 22, 0.25);
    border-color: #fb923c;
    box-shadow: 0 0 15px rgba(249, 115, 22, 0.3);
}

/* 分析统计 */
.analysis {
    background: rgba(255,255,255,0.03);
    border-radius: 12px;
    padding: 15px;
    margin: 1.5rem 0;
    font-size: 0.85rem;
    border: 1px solid var(--border);
}

.analysis h4 {
    margin: 0 0 10px 0;
    color: var(--text-s);
    font-size: 0.9rem;
}

.stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 5px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.stat-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
}

/* 按钮组 - 移动到字符选择器下方 */
.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 1.5rem;
}

.sec-btn {
    background: rgba(255,255,255,0.05);
    color: var(--text-p);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 14px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.sec-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* 安全提示 */
.security-tips {
    margin-top: 1.5rem;
    padding: 15px;
    background: rgba(46, 160, 67, 0.1);
    border: 1px solid rgba(46, 160, 67, 0.3);
    border-radius: 12px;
    font-size: 0.85rem;
}

.security-tips h4 {
    margin: 0 0 8px 0;
    color: var(--success);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tips-list {
    margin: 0;
    padding-left: 20px;
    color: var(--text-s);
}

.tips-list li {
    margin-bottom: 5px;
}

/* 提示弹窗 */
#copy-toast {
    position: fixed; 
    bottom: 30px; 
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--success); 
    color: white;
    padding: 12px 28px; 
    border-radius: 50px; 
    font-size: 0.9rem;
    opacity: 0; 
    pointer-events: none;
    z-index: 1000;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

#copy-toast.show { 
    opacity: 1; 
    transform: translateX(-50%) translateY(0);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
        max-width: 95%;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    #output {
        font-size: 1.5rem;
        padding: 0 1.5rem;
    }
    
    .preset-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .char-selector-grid {
        grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    }
    
    .char-item {
        font-size: 1rem;
    }
    
    .char-category-actions {
        flex-wrap: wrap;
        justify-content: flex-end;
    }
    
    .category-btn {
        padding: 5px 8px;
        font-size: 0.7rem;
    }
    
    .generate-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .main-generate-btn,
    .quick-generate-btn {
        width: 100%;
        justify-content: center;
    }
    
    .button-group {
        grid-template-columns: 1fr;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .preset-buttons {
        grid-template-columns: 1fr;
    }
    
    .char-selector-grid {
        grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
        gap: 8px;
    }
    
    .char-item {
        font-size: 0.9rem;
    }
    
    .char-category-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .char-category-actions {
        margin-left: 0;
        margin-top: 10px;
        width: 100%;
        justify-content: space-between;
    }
    
    .category-btn {
        flex: 1;
        text-align: center;
        padding: 8px 6px;
    }
}