:root {
    --bg-color: #f4f1ea;
    --text-color: #2c2c2c;
    --accent-color: #8b4513;
    --border-color: #d3cdbc;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" opacity="0.03"><path d="M0 0h100v100H0z" fill="none"/><path d="M10 10l80 80M90 10L10 90" stroke="%23000" stroke-width="0.5"/></svg>');
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    padding: 60px 0 40px;
    text-align: center;
}

h1 {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.tagline {
    font-size: 1.2rem;
    color: #666;
    font-style: italic;
}

/* GitHub Corner */
.github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {
    0%, 100% { transform: rotate(0); }
    20%, 60% { transform: rotate(-25deg); }
    40%, 80% { transform: rotate(10deg); }
}

@media (max-width: 500px) {
    .github-corner:hover .octo-arm {
        animation: none;
    }
    .github-corner .octo-arm {
        animation: octocat-wave 560ms ease-in-out;
    }
    .github-corner svg {
        width: 60px;
        height: 60px;
    }
}

.language-switch {
    position: absolute;
    top: 20px;
    right: 90px;
    display: flex;
    gap: 10px;
}

.language-switch button {
    background: none;
    border: 1px solid var(--border-color);
    padding: 5px 12px;
    cursor: pointer;
    font-size: 0.9rem;
    border-radius: 4px;
    color: #666;
    transition: var(--transition);
    min-width: 80px; /* 保持宽度稳定 */
}

/* Input Section */
.preview-section {
    margin-bottom: 50px;
}

.input-group {
    display: flex;
    max-width: 500px;
    margin: 0 auto 30px;
    box-shadow: var(--card-shadow);
    border-radius: 8px;
    overflow: hidden;
}

input[type="text"] {
    flex: 1;
    padding: 15px 20px;
    border: none;
    font-size: 1.1rem;
    background: white;
    outline: none;
}

#generate-btn {
    padding: 0 30px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: bold;
    transition: var(--transition);
}

#generate-btn:hover {
    background-color: #5d2e0d;
}

/* Card Preview */
.preview-card {
    background: white;
    min-height: 220px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-shadow: var(--card-shadow);
    position: relative;
    border: 1px solid var(--border-color);
}

#card-wrapper img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    transition: var(--transition);
}

#card-wrapper img.hidden {
    opacity: 0;
    transform: scale(0.95);
}

/* Copy Section */
.copy-section {
    max-width: 800px;
    margin: 0 auto 50px;
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 8px 15px;
    cursor: pointer;
    font-size: 1rem;
    color: #888;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    font-weight: bold;
}

.code-container {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 8px;
    position: relative;
    margin-bottom: 15px;
}

code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
    white-space: pre-wrap;
}

#copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
}

#copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.feedback {
    text-align: center;
    color: #4CAF50;
    font-weight: bold;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: #888;
}

.github-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
}

.github-link:hover {
    text-decoration: underline;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hidden {
    display: none !important;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(139, 69, 19, 0.2);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive */
@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    .input-group { flex-direction: column; box-shadow: none; gap: 10px; }
    input[type="text"] { border-radius: 8px; border: 1px solid var(--border-color); }
    #generate-btn { border-radius: 8px; padding: 12px; }
}