/* ===== CSS变量（主题色） ===== */
:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --border-color: #e2e8f0;
    --link-color: #3b82f6;
    --link-hover: #2563eb;
    --success-color: #10b981;
    --success-hover: #059669;
    --burn-notice-bg: #fff3cd;
    --burn-notice-text: #856404;
    --notification-bg: #4CAF50;
    --notification-text: white;
}

[data-theme="dark"] {
    --bg-color: #1a202c;
    --card-bg: #2d3748;
    --text-primary: #ffffff;
    --text-secondary: #e2e8f0;
    --text-tertiary: #a0aec0;
    --border-color: #4a5568;
    --link-color: #63b3ed;
    --link-hover: #90cdf4;
    --success-color: #38b2ac;
    --success-hover: #319795;
    --burn-notice-bg: #5c3c00;
    --burn-notice-text: #ffd700;
    --notification-bg: #38a169;
    --notification-text: #f7fafc;
}

/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-secondary);
    transition: background-color 0.3s ease;
    padding: 20px;
}

/* ===== 容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* ===== 卡片 ===== */
.card {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    overflow: hidden;
    transition: background-color 0.3s ease;
}

/* ===== 输入框 ===== */
.input-area {
    resize: none;
    width: 100%;
    height: 150px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-secondary);
    background-color: var(--card-bg);
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.input-area:focus {
    outline: none;
    border-color: var(--link-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: 0.375rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    min-height: 44px;
    min-width: 44px;
}

.btn-primary {
    background-color: var(--link-color);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--link-hover);
}

.btn-success {
    background-color: var(--success-color);
    color: #ffffff;
}

.btn-success:hover {
    background-color: var(--success-hover);
}

.btn-secondary {
    background-color: var(--border-color);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background-color: #cbd5e0;
}

.full-width-btn {
    width: 100%;
    display: flex;
    justify-content: center;
}

.btn-icon {
    margin-right: 0.5rem;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input {
    display: block;
    width: 100%;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-secondary);
    background-color: var(--card-bg);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--link-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.form-select {
    display: block;
    width: 100%;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-secondary);
    background-color: var(--card-bg);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.form-select:focus {
    outline: none;
    border-color: var(--link-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.form-checkbox {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.5rem;
    accent-color: var(--link-color);
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

/* ===== 预览 ===== */
.preview-card {
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 1rem;
    min-height: 150px;
    background-color: var(--card-bg);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.preview-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.preview-content {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
}

.preview-meta {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 1rem;
}

/* ===== 分享链接 & 二维码 ===== */
.share-link-container {
    display: flex;
    align-items: center;
    margin: 1rem 0;
}

.share-link {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem 0 0 0.375rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.copy-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--border-color);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 0.375rem 0.375rem 0;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 44px;
    min-width: 44px;
}

.copy-btn:hover {
    background-color: #cbd5e0;
}

.qrcode-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1rem 0;
}

/* ===== 阅后即焚提示 ===== */
.burn-notice {
    background-color: var(--burn-notice-bg);
    color: var(--burn-notice-text);
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    border-left: 4px solid var(--burn-notice-text);
    display: flex;
    align-items: center;
}

.burn-notice i {
    margin-right: 8px;
    font-size: 16px;
}

/* ===== 主题切换 ===== */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.25rem;
    transition: color 0.3s ease;
    min-height: 44px;
    min-width: 44px;
}

.theme-toggle:hover {
    color: var(--link-color);
}

/* ===== 头部 ===== */
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.main-title, .section-title {
    color: var(--text-primary);
}

/* ===== 剪贴板提示 ===== */
.clipboard-message {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 0.75rem 1rem;
    background-color: var(--notification-bg);
    color: var(--notification-text);
    border-radius: 0.375rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.clipboard-message.show {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 复制通知（view.html用） ===== */
.copy-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--notification-bg);
    color: var(--notification-text);
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateX(120%);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
}

.copy-notification i {
    margin-right: 8px;
}

.copy-notification.show {
    transform: translateX(0);
    opacity: 1;
}

/* ===== 错误页面 ===== */
.error-container {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.error-container i {
    font-size: 48px;
    margin-bottom: 20px;
    color: #e53e3e;
}

.error-container h2 {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.error-container p {
    font-size: 16px;
}

/* ===== 工具类 ===== */
.hidden {
    display: none;
}

.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

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

/* ===== 时间信息 ===== */
.time-info {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.text-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

/* ===== 分割线 ===== */
.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 20px 0;
}

/* ===== 响应式适配 ===== */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .grid {
        grid-template-columns: 1fr !important;
    }
    
    .input-area {
        height: 120px;
        font-size: 16px; /* 防止iOS自动缩放 */
    }
    
    .form-input,
    .form-select {
        font-size: 16px;
    }
}