* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: radial-gradient(circle at 20% 30%, #0a0f1e, #03060c);
    font-family: 'Segoe UI', 'Roboto', 'Noto Sans CJK SC', 'Microsoft YaHei', monospace;
    min-height: 100vh;
    padding: 2rem 1.5rem;
    color: #eef5ff;
}

/* 主容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* 警徽风格头部 */
.badge-header {
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}
.badge-icon {
    font-size: 3rem;
    filter: drop-shadow(0 0 6px #00a6ff);
    letter-spacing: 8px;
}
h1 {
    font-size: 2rem;
    background: linear-gradient(135deg, #e0eefc, #7ab3ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: 2px;
    font-weight: 600;
    margin-top: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.sub {
    color: #7f8fa4;
    border-top: 1px solid #2a3455;
    display: inline-block;
    padding-top: 0.5rem;
    margin-top: 0.75rem;
    font-size: 0.85rem;
    font-family: monospace;
}
.badge-header::after {
    content: "⚡ 绝密 · 卧底信道 ⚡";
    position: absolute;
    bottom: -1.2rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    background: #0f1422cc;
    backdrop-filter: blur(4px);
    padding: 0.2rem 1rem;
    border-radius: 40px;
    color: #b9d0ff;
    letter-spacing: 1px;
    white-space: nowrap;
}

/* 双卡布局 */
.cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

/* 公用卡片样式 */
.card {
    background: rgba(12, 20, 30, 0.65);
    backdrop-filter: blur(12px);
    border-radius: 2rem;
    border: 1px solid rgba(72, 120, 184, 0.4);
    box-shadow: 0 20px 35px -12px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.05);
    padding: 1.6rem 1.8rem;
    transition: all 0.2s ease;
}
.card:hover {
    border-color: #2f6eb3;
    box-shadow: 0 22px 38px -14px #001d3d;
}
.card-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid #2f7bc0;
    padding-left: 1rem;
}
.card-header h2 {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 1px;
}
.badge-role {
    background: #0e2a3b;
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 30px;
    color: #8fcbff;
}

/* 输入输出区域 */
.input-group, .output-group {
    margin-bottom: 1.5rem;
}
label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    color: #9bb5e0;
    margin-bottom: 0.5rem;
}
textarea, .result-area {
    width: 100%;
    background: #050a12;
    border: 1px solid #2a3b55;
    border-radius: 1.2rem;
    padding: 1rem 1.2rem;
    font-family: 'SF Mono', 'Fira Code', 'Noto Sans CJK SC', monospace;
    font-size: 1rem;
    color: #d6e6ff;
    resize: vertical;
    transition: 0.2s;
}
textarea:focus {
    outline: none;
    border-color: #3e8ed0;
    box-shadow: 0 0 0 3px rgba(62, 142, 208, 0.3);
    background: #0a111f;
}
.result-area {
    background: #07111e;
    min-height: 100px;
    white-space: pre-wrap;
    word-break: break-all;
    font-weight: 400;
    border: 1px solid #2b4970;
    cursor: text;
}
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin: 1rem 0 0.5rem;
}
button {
    background: #132433;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 2rem;
    font-weight: 600;
    font-size: 0.8rem;
    font-family: inherit;
    color: #cae3ff;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid #2e5177;
}
button.primary {
    background: #1f6392;
    border-color: #4c9eff;
    color: white;
    box-shadow: 0 2px 5px #00000033;
}
button.primary:hover {
    background: #2b7bb3;
    transform: translateY(-1px);
    box-shadow: 0 6px 12px -6px #0a2a44;
}
button:hover {
    background: #1e3a5a;
    border-color: #618cbb;
}
.copy-btn {
    background: #1a2a3c;
    font-size: 0.75rem;
}
.fill-btn {
    background: #152836;
    border-color: #3b6290;
}

hr {
    margin: 1rem 0;
    border-color: #253c58;
}

.tips {
    font-size: 0.7rem;
    text-align: center;
    color: #5e7a9a;
    margin-top: 2rem;
    border-top: 1px dashed #1f3450;
    padding-top: 1.2rem;
}

/* 响应式 */
@media (max-width: 860px) {
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 1.8rem;
    }
    body {
        padding: 1.2rem;
    }
    .card {
        padding: 1.2rem;
    }
}

.error-msg {
    color: #ffac9f;
    background: #3a1e1e80;
    border-radius: 40px;
    padding: 0.3rem 1rem;
    font-size: 0.75rem;
    margin-top: 0.6rem;
    display: inline-block;
}
.flex-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}
.small-note {
    font-size: 0.7rem;
    color: #6a85b0;
}

/* 返回首页按钮 */
.btn-home {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: linear-gradient(135deg, #1f6392 0%, #2f7bc0 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}
.btn-home:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}
@media (max-width: 860px) {
    .btn-home {
        top: 10px;
        left: 10px;
        padding: 8px 12px;
        font-size: 12px;
    }
}