/* ============================================
   汉字转拼音工具 - 科技蓝主题 + 响应式布局
   ============================================ */

/* CSS变量 - 科技蓝配色 */
:root {
    --blue-primary: #0a84ff;
    --blue-dark: #0056b3;
    --blue-light: #e6f2ff;
    --blue-glow: rgba(10, 132, 255, 0.3);
    --blue-bg: #f0f7ff;
    --text-dark: #1a1a2e;
    --text-gray: #5a6a7a;
    --border-color: #d0e3f0;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 20px rgba(10, 132, 255, 0.12);
    --shadow-hover: 0 8px 30px rgba(10, 132, 255, 0.18);
}

/* 全局容器 */
.pinyin-tool {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    color: var(--text-dark);
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 标题区 */
.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--blue-dark);
    margin: 0 0 12px 0;
    padding: 6px 0 6px 10px;
    border-left: 3px solid var(--blue-primary);
    line-height: 1.5;
    display: inline-block;
}

.title-icon {
    font-size: 1.5rem;
}

/* 转换板块 */
.section-convert {
    margin-bottom: 32px;
}

/* 卡片面板 */
.card-panel {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 12px;
    box-shadow: var(--shadow);
}

.input-card,
.result-card {
    padding: 16px;
}

.result-panel {
    background: linear-gradient(135deg, #f8fbff 0%, #fff 100%);
}

/* 操作按钮栏 */
.action-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 14px;
}

.action-bar .btn {
    flex: 1;
    padding: 12px 16px;
    font-size: 0.95rem;
}

.action-bar .btn-icon {
    font-size: 1.1rem;
}

/* 输入组 */
.input-group {
    margin-bottom: 12px;
}

.input-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--blue-dark);
    margin-bottom: 6px;
}

/* 文本框 */
.text-area {
    width: 100%;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 1rem;
    font-family: inherit;
    line-height: 1.6;
    resize: vertical;
    transition: border-color 0.3s, box-shadow 0.3s;
    background: #fff;
    color: var(--text-dark);
    box-sizing: border-box;
}

.text-area:focus {
    outline: none;
    border-color: var(--blue-primary);
    box-shadow: 0 0 0 4px var(--blue-glow);
}

.input-area {
    min-height: 100px;
}

.output-area {
    background: var(--blue-bg);
    cursor: default;
}

/* 选项行 */
.options-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 0 0 0;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-weight: 500;
    color: var(--text-dark);
}

.toggle-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--blue-primary);
}

.toggle-text {
    font-weight: 500;
}

.toggle-hint {
    font-size: 0.82rem;
    color: var(--text-gray);
}

.char-count {
    margin-left: auto;
    font-size: 0.82rem;
    color: var(--text-gray);
}

/* 按钮行 */
.action-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.action-row .btn {
    flex: 1;
    min-width: 100px;
    justify-content: center;
}

.print-row {
    margin-top: 14px;
}

.print-row .btn {
    flex: 1;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
    font-family: inherit;
}

.btn-icon {
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--blue-primary), var(--blue-dark));
    color: #fff;
    box-shadow: 0 4px 15px rgba(10, 132, 255, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1a90ff, #0062cc);
    box-shadow: 0 6px 20px rgba(10, 132, 255, 0.45);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #fff;
    color: var(--blue-dark);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--blue-primary);
    color: var(--blue-primary);
    background: var(--blue-light);
}

.btn-print {
    background: linear-gradient(135deg, #34c759, #248a3d);
    color: #fff;
    box-shadow: 0 4px 15px rgba(52, 199, 89, 0.3);
}

.btn-print:hover {
    background: linear-gradient(135deg, #30d158, #28a745);
    box-shadow: 0 6px 20px rgba(52, 199, 89, 0.4);
    transform: translateY(-1px);
}

/* 预览板块 */
.section-preview {
    margin-bottom: 32px;
}

.preview-box {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.preview-row {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 10px 0;
    border-bottom: 1px dashed #e8f0f8;
}

.preview-row:last-child {
    border-bottom: none;
}

.preview-char {
    font-size: 2rem;
    font-weight: bold;
    color: var(--blue-dark);
    min-width: 48px;
    text-align: center;
    line-height: 1.4;
}

.preview-pinyin {
    font-size: 1.2rem;
    color: var(--blue-primary);
    font-weight: 500;
    line-height: 1.8;
    font-family: "Arial", sans-serif;
}

/* 田字格预览样式 */
.preview-grid-box {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.preview-grid-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 60px;
}

.preview-pinyin-top {
    font-size: 12pt;
    color: #333;
    height: 20px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 2px;
    font-family: Arial, sans-serif;
}

.preview-tianzige {
    width: 50px;
    height: 50px;
    border: 1px solid #333;
    background: #fff;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24pt;
    color: #111;
    font-family: "KaiTi", "楷体", "STKaiti", serif;
}

.preview-tianzige::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    right: 0;
    border-top: 1px dashed #ccc;
}

.preview-tianzige::after {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    bottom: 0;
    border-left: 1px dashed #ccc;
}

/* 加载更多按钮 */
.load-more-box {
    text-align: center;
    padding: 16px 0;
}

.btn-load-more {
    background: var(--blue-bg);
    color: var(--blue-dark);
    border: 1px solid var(--blue-primary);
    padding: 8px 20px;
    font-size: 0.85rem;
    font-weight: normal;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-load-more:hover {
    background: var(--blue-primary);
    color: #fff;
}

/* 帮助板块 */
.section-help {
    margin-bottom: 24px;
}

.help-content {
    display: grid;
    gap: 12px;
    background: var(--blue-bg);
    border-radius: var(--radius);
    padding: 20px 24px;
    border: 1px solid var(--border-color);
}

.help-item {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.7;
}

.help-item strong {
    color: var(--blue-dark);
}

/* ============================================
   响应式设计 - 主流前端间距规范
   ============================================ */

/* 超小屏幕 (<480px) - 手机竖屏 */
@media screen and (max-width: 480px) {
    .pinyin-tool {
        padding: 0 16px;
    }

    .section-title {
        font-size: 1rem;
        margin-bottom: 12px;
        padding: 4px 0 4px 10px;
    }

    .title-icon {
        font-size: 1.1rem;
    }

    .card-panel {
        padding: 14px;
        margin-bottom: 10px;
        border-radius: var(--radius-sm);
    }

    .input-card,
    .result-card {
        padding: 12px;
    }

    .input-group {
        margin-bottom: 10px;
    }

    .text-area {
        font-size: 0.95rem;
        padding: 10px 12px;
        min-height: 90px;
    }

    .input-area {
        min-height: 90px;
    }

    .action-bar {
        gap: 8px;
        margin-bottom: 10px;
    }

    .action-bar .btn {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .action-bar .btn-icon {
        font-size: 1rem;
    }

    .toggle-hint {
        font-size: 0.78rem;
    }

    .print-row {
        flex-direction: row;
        gap: 10px;
    }

    .print-row .btn {
        flex: 1;
        padding: 12px 10px;
        min-height: 44px;
        font-size: 0.88rem;
    }

    .preview-box {
        padding: 16px;
    }

    .preview-row {
        gap: 12px;
        padding: 8px 0;
    }

    .preview-char {
        font-size: 1.5rem;
        min-width: 36px;
    }

    .preview-pinyin {
        font-size: 1rem;
    }

    .preview-grid-box {
        gap: 6px;
    }

    .preview-grid-cell {
        width: 48px;
    }

    .preview-pinyin-top {
        font-size: 10pt;
        height: 16px;
    }

    .preview-tianzige {
        width: 40px;
        height: 40px;
        font-size: 18pt;
    }

    .help-content {
        padding: 16px;
    }

    .help-item {
        font-size: 0.88rem;
    }
}

/* 小屏幕 (480px-768px) - 手机横屏/小平板 */
@media screen and (min-width: 481px) and (max-width: 768px) {
    .pinyin-tool {
        padding: 0 20px;
    }

    .card-panel {
        padding: 16px;
    }

    .input-group {
        margin-bottom: 12px;
    }

    .text-area {
        padding: 12px 14px;
    }

    .options-row {
        flex-wrap: wrap;
        padding: 8px 0 0 0;
    }

    .action-bar {
        gap: 10px;
    }

    .action-row .btn {
        padding: 11px 16px;
        font-size: 0.92rem;
    }

    .print-row {
        flex-direction: column;
    }

    .print-row .btn {
        width: 100%;
    }
}

/* 中等屏幕 (768px-1024px) - 平板竖屏 */
@media screen and (min-width: 769px) and (max-width: 1024px) {
    .pinyin-tool {
        padding: 0 24px;
    }

    .card-panel {
        padding: 18px;
    }

    .section-title {
        font-size: 1.05rem;
    }
}

/* 大屏幕 (>1024px) - 平板横屏/桌面 */
@media screen and (min-width: 1025px) {
    .pinyin-tool {
        max-width: 800px;
        padding: 0 32px;
    }

    .card-panel {
        padding: 20px;
    }

    .text-area {
        min-height: 120px;
    }
}