:root {
    --accent: #10b981; /* 绿色系代表计算与数值 */
    --accent-dark: #0d9e6f;
    --bg: #0a0c10;
    --card: #161b22;
    --text: #f0f6fc;
    --text-secondary: #8b949e;
    --border: #30363d;
    --border-light: #3e4a58;
}

* { 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: 600px; border: 1px solid var(--border);
    box-shadow: 0 25px 50px rgba(0,0,0,0.5);
}

/* 结果显示区 */
.result-wrapper {
    background: #0d1117; border: 1px solid var(--border);
    border-radius: 16px; padding: 1.5rem; margin-bottom: 1.5rem;
    position: relative; min-height: 140px;
    display: flex; flex-direction: column; justify-content: center;
}

#result-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem; color: var(--accent);
    text-align: center; word-break: break-all;
    max-height: 300px; overflow-y: auto;
    white-space: pre-wrap;
    line-height: 1.4;
    padding-right: 10px;
}

.result-actions {
    display: flex; gap: 10px; margin-top: 15px;
    flex-wrap: wrap;
}

.action-btn {
    display: flex; align-items: center; gap: 6px;
    background: transparent; border: 1px solid var(--border);
    color: var(--text-secondary); padding: 8px 12px;
    border-radius: 8px; cursor: pointer;
    font-size: 0.85rem; font-family: 'Inter', sans-serif;
}
.action-btn:hover {
    background: var(--border); color: var(--accent);
    border-color: var(--accent);
}

.icon-btn {
    position: absolute; right: 12px; top: 12px;
    background: transparent; border: none; color: #8b949e;
    cursor: pointer; padding: 8px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
}
.icon-btn:hover { background: var(--border); color: var(--accent); }

/* 控制面板 */
.controls { display: grid; gap: 1.5rem; }

.mode-selector {
    display: flex; background: #0d1117; padding: 4px; border-radius: 12px;
    border: 1px solid var(--border);
}
.mode-btn {
    flex: 1; border: none; background: transparent; color: #8b949e;
    padding: 10px; border-radius: 8px; cursor: pointer; font-weight: 600;
}
.mode-btn.active { background: var(--accent); color: white; }

.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.input-group { display: flex; flex-direction: column; gap: 6px; }
label { font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; }

input[type="number"], input[type="text"] {
    background: #0d1117; border: 1px solid var(--border);
    color: white; padding: 10px 12px; border-radius: 8px;
    font-family: 'JetBrains Mono', monospace; outline: none;
    font-size: 0.95rem;
}
input:focus { border-color: var(--accent); }

/* 复选框样式 */
.checkbox-group {
    display: flex; align-items: center; gap: 10px;
    padding: 10px; background: #0d1117;
    border-radius: 8px; border: 1px solid var(--border);
}
.checkbox-group input[type="checkbox"] {
    width: 18px; height: 18px; cursor: pointer;
    accent-color: var(--accent);
}

/* 格式化选项 */
.format-options {
    display: flex; gap: 10px; flex-wrap: wrap;
    padding: 10px; background: #0d1117;
    border-radius: 8px; border: 1px solid var(--border);
}
.format-option {
    display: flex; align-items: center; gap: 6px;
}
.format-option label {
    cursor: pointer; font-size: 0.85rem;
    color: var(--text-secondary);
}
.format-option input[type="radio"] {
    width: 16px; height: 16px; cursor: pointer;
    accent-color: var(--accent);
}

/* 按钮组 */
.button-group {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
    margin-top: 1rem;
}

.gen-btn {
    background: var(--accent); color: white;
    border: none; padding: 1rem; border-radius: 12px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.gen-btn:hover { background: var(--accent-dark); transform: translateY(-1px); }

.sec-btn {
    background: transparent; color: var(--text-secondary);
    border: 1px solid var(--border); padding: 1rem; border-radius: 12px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.sec-btn:hover {
    background: var(--border); color: var(--accent);
    border-color: var(--accent);
}

/* 历史记录 */
.history-section {
    margin-top: 2rem; border-top: 1px solid var(--border);
    padding-top: 1.5rem; display: none;
}
.history-header {
    display: flex; justify-content: space-between;
    align-items: center; margin-bottom: 1rem;
}
.history-list {
    display: flex; flex-direction: column; gap: 10px;
    max-height: 200px; overflow-y: auto;
    padding-right: 10px;
}
.history-item {
    background: #0d1117; padding: 10px 15px;
    border-radius: 8px; border: 1px solid var(--border);
    display: flex; justify-content: space-between;
    align-items: center; font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}
.history-actions {
    display: flex; gap: 8px;
}

/* 警告提示 */
.warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 8px;
    padding: 10px 15px;
    margin: 10px 0;
    font-size: 0.85rem;
    color: #fbbf24;
}

/* Toast提示 */
#toast {
    position: fixed; bottom: 20px; left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--accent); color: white;
    padding: 12px 24px; border-radius: 50px;
    opacity: 0; pointer-events: none; z-index: 1000;
    font-weight: 500; box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 响应式调整 */
@media (max-width: 600px) {
    .container { padding: 1.5rem; }
    .input-row { grid-template-columns: 1fr; }
    .button-group { grid-template-columns: 1fr; }
    .format-options { flex-direction: column; align-items: flex-start; }
    #result-display { font-size: 1.2rem; }
}