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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f0f2f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0 30px;
}

header h1 {
    font-size: 2.2em;
    color: #1a1a2e;
}

.subtitle {
    color: #888;
    font-size: 0.95em;
    margin-top: 5px;
}

/* 表单区域 */
.note-form {
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    margin-bottom: 30px;
}

.note-form h2 {
    font-size: 1.2em;
    margin-bottom: 15px;
    color: #1a1a2e;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4a6cf7;
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.1);
}

.btn {
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: #4a6cf7;
    color: #fff;
}

.btn-primary:hover {
    background: #3b5de7;
}

.btn-danger {
    background: #ff4757;
    color: #fff;
    padding: 6px 14px;
    font-size: 0.85em;
}

.btn-danger:hover {
    background: #e0394a;
}

/* 笔记列表 */
.notes-list h2 {
    font-size: 1.2em;
    margin-bottom: 15px;
    color: #1a1a2e;
}

.badge {
    background: #4a6cf7;
    color: #fff;
    border-radius: 20px;
    padding: 2px 10px;
    font-size: 0.75em;
    font-weight: 500;
}

.notes-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.loading {
    text-align: center;
    color: #999;
    padding: 30px;
}

.empty {
    text-align: center;
    color: #999;
    padding: 40px;
    background: #fff;
    border-radius: 12px;
    font-size: 1.05em;
}

.note-card {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: transform 0.15s, box-shadow 0.15s;
}

.note-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.note-card h3 {
    color: #1a1a2e;
    margin-bottom: 8px;
    font-size: 1.1em;
}

.note-card p {
    color: #666;
    margin-bottom: 10px;
    white-space: pre-wrap;
    word-break: break-word;
}

.note-card .meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8em;
    color: #aaa;
}

.error-message {
    background: #fff3f3;
    color: #d32f2f;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 8px;
    border: 1px solid #ffcdd2;
}

.retry-hint {
    text-align: center;
    font-size: 0.9em;
}

.retry-hint a {
    color: #4a6cf7;
    cursor: pointer;
    text-decoration: underline;
}