/* ==================== 设计令牌与全局基础 ==================== */
:root {
  --ink: #102a43;
  --ink-soft: #334e68;
  --muted: #6b7c8f;
  --line: #dbe4ea;
  --line-strong: #c9d6df;
  --paper: #ffffff;
  --canvas: #f3f6f5;
  --teal: #116466;
  --teal-deep: #0b4f51;
  --teal-pale: #e1f1ee;
  --mint: #b8e0d2;
  --coral: #e66b4d;
  --coral-pale: #fff0ea;
  --warning: #a26012;
  --warning-bg: #fff6df;
  --danger: #b43f3f;
  --success: #18794e;
  --shadow: 0 24px 65px rgba(30, 55, 65, 0.1);
  --radius-lg: 24px;
  --radius-md: 15px;
  --radius-sm: 10px;
  font-family: Inter, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
}

/* 统一盒模型，避免边框和内边距导致组件尺寸溢出。 */
* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

/* 页面背景使用低对比度光晕，突出白色工具卡片而不干扰二维码。 */
body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 14% 2%, rgba(184, 224, 210, 0.35), transparent 24rem),
    radial-gradient(circle at 95% 24%, rgba(230, 107, 77, 0.08), transparent 21rem),
    var(--canvas);
  color: var(--ink);
  line-height: 1.5;
}

/* 所有交互控件继承页面字体，保持中英文排版一致。 */
button,
input,
textarea,
select {
  font: inherit;
}

button,
select,
input[type="color"],
input[type="range"] {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex="0"]:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(47, 128, 237, 0.32);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

/* 保留给屏幕阅读器、但不参与视觉布局的通用辅助类。 */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 键盘导航时显示的“跳到主要内容”链接。 */
.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ==================== 顶部品牌栏 ==================== */
.site-header {
  border-bottom: 1px solid rgba(201, 214, 223, 0.72);
  background: rgba(243, 246, 245, 0.82);
  backdrop-filter: blur(14px);
}

.header-inner,
.page-shell,
footer {
  width: min(1500px, calc(100% - 48px));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

/* 用 CSS 网格模拟二维码图形，避免额外的图片请求。 */
.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 3px;
  padding: 5px;
  border-radius: 10px;
  background: var(--ink);
  box-shadow: 0 7px 18px rgba(16, 42, 67, 0.18);
}

.brand-mark i {
  display: block;
  border-radius: 2px;
  background: #fff;
}

.brand-mark i:nth-child(2) {
  grid-column: 3;
}

.brand-mark i:nth-child(3) {
  grid-row: 2;
  grid-column: 2;
  background: var(--mint);
}

.brand-mark i:nth-child(4) {
  grid-row: 3;
  grid-column: 1;
}

.brand-mark i:nth-child(5) {
  grid-row: 3;
  grid-column: 3;
}

.brand-copy {
  display: grid;
  line-height: 1.05;
}

.brand-copy strong {
  font-size: 19px;
  letter-spacing: 0.08em;
}

.brand-copy small {
  margin-top: 5px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

/* 本地处理状态徽标，向用户持续说明隐私边界。 */
.local-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid rgba(17, 100, 102, 0.16);
  border-radius: 999px;
  background: rgba(225, 241, 238, 0.72);
  color: var(--teal-deep);
  font-size: 12px;
  font-weight: 700;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #32a376;
  box-shadow: 0 0 0 4px rgba(50, 163, 118, 0.13);
}

/* ==================== 主功能区与卡片骨架 ==================== */
.page-shell {
  padding-block: 28px 36px;
}

/* 宽屏下生成器与解析器并排，较窄屏幕由媒体查询改为单列。 */
.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(420px, 0.75fr);
  gap: 24px;
  align-items: start;
}

.tool-card {
  overflow: hidden;
  border: 1px solid rgba(201, 214, 223, 0.82);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

/* 工具卡片标题栏统一编号、标题和简短功能说明。 */
.card-heading {
  display: flex;
  min-height: 86px;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px;
  border-bottom: 1px solid var(--line);
}

.card-heading > div {
  display: flex;
  align-items: center;
  gap: 13px;
}

.card-heading h2 {
  margin: 0;
  font-size: 21px;
  letter-spacing: -0.02em;
}

.section-number {
  display: grid;
  width: 29px;
  height: 29px;
  place-items: center;
  border-radius: 8px;
  background: var(--teal-pale);
  color: var(--teal);
  font-size: 11px;
  font-weight: 900;
}

.section-number.coral {
  background: var(--coral-pale);
  color: var(--coral);
}

.heading-note {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

/* ==================== 二维码生成器表单 ==================== */
.generator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.63fr);
}

.generator-form {
  padding: 28px;
  border-right: 1px solid var(--line);
}

/* 表单字段使用 min-width: 0 防止长文本撑开网格。 */
.field-group {
  min-width: 0;
}

.field-group > label,
.label-row label,
.color-fieldset legend,
.field-label,
.color-control > span:first-child {
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 750;
}

.label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.value-note,
output {
  color: var(--muted);
  font-size: 11px;
  font-weight: 650;
}

.content-meta {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

/* 清空按钮靠近字符计数，减少鼠标在表单中的移动距离。 */
.clear-content-button {
  min-height: 25px;
  padding: 2px 9px;
  border: 1px solid rgba(180, 63, 63, 0.18);
  border-radius: 999px;
  background: #fff8f6;
  color: var(--danger);
  font-size: 10px;
  font-weight: 750;
  transition: border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.clear-content-button:hover:not(:disabled) {
  border-color: rgba(180, 63, 63, 0.36);
  background: #fff0ed;
}

.clear-content-button:disabled {
  border-color: var(--line);
  background: #f4f6f7;
  color: #9aa8b3;
}

textarea,
select {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: #fbfcfc;
  color: var(--ink);
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

textarea:hover,
select:hover {
  border-color: #afc0cc;
}

textarea:focus,
select:focus {
  border-color: var(--teal);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(17, 100, 102, 0.1);
  outline: 0;
}

textarea {
  min-height: 120px;
  margin-top: 8px;
  padding: 14px 15px;
  resize: vertical;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.65;
}

select {
  height: 42px;
  margin-top: 7px;
  padding: 0 34px 0 11px;
}

.field-error {
  min-height: 18px;
  margin: 5px 0 0;
  color: var(--danger);
  font-size: 11px;
}

/* 可折叠设置面板让高级参数不占据初始视线焦点。 */
.settings-panel {
  border-top: 1px solid var(--line);
}

.content-field + .settings-panel {
  margin-top: 16px;
}

.settings-panel summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}

.settings-panel summary::-webkit-details-marker {
  display: none;
}

.settings-panel summary::before {
  content: "+";
  display: inline-grid;
  width: 20px;
  height: 20px;
  margin-right: 9px;
  place-items: center;
  border-radius: 50%;
  background: #edf2f3;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
}

.settings-panel[open] summary::before {
  content: "−";
  background: var(--teal-pale);
  color: var(--teal);
}

.settings-panel summary > span:first-child {
  margin-right: auto;
}

.summary-hint {
  color: var(--muted);
  font-size: 10px;
  font-weight: 650;
}

.settings-content {
  display: grid;
  gap: 18px;
  padding: 3px 2px 23px;
}

.control-row {
  display: flex;
  align-items: end;
  gap: 14px;
}

.control-row > * {
  flex: 1;
}

.compact-field {
  min-width: 116px;
}

.range-field {
  padding-bottom: 2px;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  margin: 16px 0 5px;
  border-radius: 99px;
  accent-color: var(--teal);
  background: var(--line);
}

.color-fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.color-fieldset legend {
  margin-bottom: 8px;
}

/* 颜色模式采用分段控件表现三个互斥选项。 */
.segmented-control {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  padding: 3px;
  border-radius: 10px;
  background: #edf2f3;
}

.segmented-control label {
  position: relative;
}

.segmented-control input {
  position: absolute;
  opacity: 0;
}

.segmented-control span {
  display: grid;
  min-height: 33px;
  place-items: center;
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
}

.segmented-control input:checked + span {
  background: #fff;
  color: var(--teal);
  box-shadow: 0 2px 8px rgba(42, 66, 73, 0.1);
}

.segmented-control input:focus-visible + span {
  outline: 3px solid rgba(47, 128, 237, 0.3);
}

.color-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.color-controls[hidden] {
  display: none;
}

.color-controls.single-color {
  grid-template-columns: 1fr;
}

.color-control {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fbfcfc;
}

.color-input-wrap {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 7px;
}

input[type="color"] {
  width: 25px;
  height: 25px;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 7px;
  background: transparent;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 1px solid rgba(16, 42, 67, 0.15);
  border-radius: 6px;
}

.color-control code {
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 10px;
  text-overflow: ellipsis;
}

.angle-field {
  grid-column: 1 / -1;
}

.background-control {
  align-self: stretch;
}

.margin-field {
  min-width: 150px;
}

/* Logo 上传行在窄屏下允许换行，避免文件名挤压按钮。 */
.logo-upload-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-file-copy {
  display: grid;
  min-width: 0;
  margin-right: auto;
}

.logo-file-copy strong {
  overflow: hidden;
  max-width: 180px;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.logo-file-copy small {
  color: var(--muted);
  font-size: 9px;
}

/* ==================== 按钮体系 ==================== */
.primary-button,
.secondary-button,
.text-button,
.glass-button,
.action-button {
  border: 0;
  border-radius: 10px;
  font-weight: 750;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.primary-button,
.secondary-button,
.action-button {
  min-height: 42px;
  padding: 0 15px;
}

.primary-button {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 8px 18px rgba(16, 42, 67, 0.17);
}

.primary-button:hover:not(:disabled) {
  background: #173a58;
  transform: translateY(-1px);
}

.secondary-button {
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--ink);
}

.secondary-button:hover:not(:disabled) {
  border-color: #9eb2c0;
  background: #f8fafb;
}

.text-button {
  padding: 4px 2px;
  background: transparent;
  color: var(--teal);
  font-size: 11px;
}

.text-button:hover {
  text-decoration: underline;
}

.danger-text {
  color: var(--danger);
}

/* ==================== 生成结果预览 ==================== */
.generator-preview {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 28px 24px;
  background:
    linear-gradient(rgba(16, 42, 67, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 42, 67, 0.025) 1px, transparent 1px),
    #fafcfc;
  background-size: 18px 18px;
}

.preview-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 正方形舞台维持二维码比例，并为 SVG/Canvas 提供统一容器。 */
.qr-stage {
  position: relative;
  display: grid;
  width: 100%;
  aspect-ratio: 1;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 12px 30px rgba(24, 49, 61, 0.08);
}

.qr-canvas {
  display: grid;
  width: 100%;
  height: 100%;
  place-items: center;
  padding: 9%;
}

.qr-canvas canvas,
.qr-canvas svg {
  display: block;
  width: 100% !important;
  height: 100% !important;
  max-width: 100%;
  max-height: 100%;
}

.qr-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.qr-empty span {
  display: block;
  margin-bottom: 4px;
  color: var(--line-strong);
  font-size: 32px;
  letter-spacing: 0.2em;
}

/* 自动回读结果通过颜色和图标区分检查中、成功、警告和空状态。 */
.status-message {
  display: flex;
  min-height: 40px;
  align-items: center;
  gap: 9px;
  margin: 14px 0;
  padding: 9px 11px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 650;
}

.status-message .status-icon {
  display: grid;
  width: 17px;
  height: 17px;
  flex: 0 0 17px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
}

.status-message.is-checking {
  background: #edf3f6;
  color: var(--ink-soft);
}

.status-message.is-checking .status-icon {
  border-right-color: transparent;
  animation: spin 0.8s linear infinite;
}

.status-message.is-valid {
  background: #e6f5ed;
  color: var(--success);
}

.status-message.is-valid .status-icon::before {
  content: "✓";
  font-size: 11px;
}

.status-message.is-warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.status-message.is-warning .status-icon::before {
  content: "!";
  font-size: 10px;
  font-weight: 900;
}

.status-message.is-empty {
  background: #edf3f6;
  color: var(--muted);
}

.status-message.is-empty .status-icon::before {
  content: "i";
  font-size: 10px;
}

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

.download-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.download-actions button {
  font-size: 11px;
}

.download-actions button span {
  margin-right: 5px;
  font-size: 16px;
}

.preview-tip {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.6;
  text-align: center;
}

/* ==================== 二维码图片解析器 ==================== */
.decoder-body {
  display: grid;
  gap: 17px;
  padding: 28px;
}

/* 拖放区同时支持鼠标点击和键盘激活。 */
.dropzone {
  display: grid;
  min-height: 270px;
  place-items: center;
  align-content: center;
  padding: 30px;
  border: 1.5px dashed #b4c3cc;
  border-radius: 17px;
  background: #fafcfc;
  color: var(--ink-soft);
  cursor: pointer;
  text-align: center;
  transition: border 160ms ease, background 160ms ease, transform 160ms ease;
}

.dropzone:hover,
.dropzone.is-dragging {
  border-color: var(--teal);
  background: #f2f9f7;
}

.dropzone.is-dragging {
  transform: scale(1.01);
}

.dropzone strong {
  margin-top: 20px;
  color: var(--ink);
  font-size: 15px;
}

.dropzone > span {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
}

.dropzone small {
  margin-top: 16px;
  color: #8a9aa8;
  font-size: 9px;
  letter-spacing: 0.04em;
}

.link-copy {
  color: var(--teal);
  font-weight: 800;
}

.drop-visual {
  position: relative;
  display: grid;
  width: 74px;
  height: 74px;
  place-items: center;
}

.corner {
  position: absolute;
  width: 19px;
  height: 19px;
  border-color: var(--teal);
  border-style: solid;
}

.corner-tl { top: 0; left: 0; border-width: 2px 0 0 2px; border-radius: 5px 0 0; }
.corner-tr { top: 0; right: 0; border-width: 2px 2px 0 0; border-radius: 0 5px 0 0; }
.corner-bl { bottom: 0; left: 0; border-width: 0 0 2px 2px; border-radius: 0 0 0 5px; }
.corner-br { right: 0; bottom: 0; border-width: 0 2px 2px 0; border-radius: 0 0 5px; }

.scan-line {
  position: absolute;
  top: 50%;
  right: 7px;
  left: 7px;
  height: 1px;
  background: var(--coral);
  box-shadow: 0 0 7px rgba(230, 107, 77, 0.55);
}

.upload-arrow {
  color: var(--teal);
  font-size: 27px;
  font-weight: 300;
}

/* Canvas 预览容器叠加文件名和更换图片操作。 */
.decode-preview-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 17px;
  background: #182b38;
}

.decode-preview-wrap canvas {
  display: block;
  width: 100%;
  max-height: 460px;
  object-fit: contain;
}

.preview-overlay-bar {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  background: linear-gradient(transparent, rgba(7, 22, 31, 0.82));
  color: #fff;
  font-size: 10px;
}

.preview-overlay-bar > span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.glass-button {
  flex: 0 0 auto;
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 10px;
  backdrop-filter: blur(8px);
}

/* 解析状态条为 aria-live 区域提供对应的视觉反馈。 */
.decode-status {
  display: flex;
  min-height: 66px;
  align-items: center;
  gap: 12px;
  padding: 13px 15px;
  border-radius: 12px;
  background: #f1f4f6;
}

.decode-status-icon {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  box-shadow: 0 2px 7px rgba(25, 49, 60, 0.08);
}

.decode-status > div {
  display: grid;
}

.decode-status strong {
  font-size: 12px;
}

.decode-status div span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 10px;
}

.decode-status.is-loading {
  background: #edf3f6;
}

.decode-status.is-loading .decode-status-icon {
  border: 2px solid var(--teal);
  border-right-color: transparent;
  color: transparent;
  animation: spin 0.8s linear infinite;
}

.decode-status.is-success {
  background: #e6f5ed;
}

.decode-status.is-success .decode-status-icon {
  color: var(--success);
}

.decode-status.is-error {
  background: #fff0ed;
}

.decode-status.is-error .decode-status-icon {
  color: var(--danger);
}

/* 结构化结果、原始文本和快捷操作统一收纳在结果卡片中。 */
.decode-result {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.result-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  margin-bottom: 17px;
}

.result-heading h3 {
  margin: 6px 0 0;
  font-size: 18px;
}

.type-badge {
  display: inline-flex;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--teal-pale);
  color: var(--teal-deep);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.success-mark {
  display: grid;
  width: 29px;
  height: 29px;
  place-items: center;
  border-radius: 50%;
  background: #e6f5ed;
  color: var(--success);
  font-weight: 900;
}

.result-fields {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 16px;
  margin: 0 0 18px;
  padding: 13px 0;
  border-block: 1px solid var(--line);
}

.result-fields:empty {
  display: none;
}

.result-fields dt {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
}

.result-fields dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 11px;
  font-weight: 650;
}

.raw-result {
  margin-top: 4px;
}

.raw-result pre {
  max-height: 170px;
  margin: 8px 0 0;
  padding: 13px;
  overflow: auto;
  border-radius: 10px;
  background: #f4f6f7;
  color: var(--ink-soft);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--teal);
  color: #fff;
  font-size: 11px;
  text-decoration: none;
}

.action-button:hover {
  background: var(--teal-deep);
}

.action-button.is-secondary {
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--ink);
}

/* ==================== 隐私说明与页脚 ==================== */
.privacy-strip {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding: 19px 24px;
  border: 1px solid rgba(17, 100, 102, 0.13);
  border-radius: 16px;
  background: rgba(225, 241, 238, 0.68);
}

/* 盾牌与勾选均由 CSS 绘制，表达数据仅在本地处理。 */
.privacy-icon {
  position: relative;
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border: 1px solid rgba(17, 100, 102, 0.13);
  border-radius: 13px;
  background: linear-gradient(145deg, #fff, #f4fbf9);
  box-shadow: 0 5px 15px rgba(17, 100, 102, 0.11);
}

.privacy-icon::before {
  content: "";
  width: 22px;
  height: 25px;
  background: linear-gradient(160deg, #178082, var(--teal-deep));
  clip-path: polygon(50% 0, 90% 15%, 86% 60%, 72% 81%, 50% 100%, 28% 81%, 14% 60%, 10% 15%);
  filter: drop-shadow(0 3px 4px rgba(11, 79, 81, 0.2));
}

.privacy-icon::after {
  content: "";
  position: absolute;
  top: 17px;
  left: 17px;
  width: 8px;
  height: 4px;
  border-bottom: 2px solid #fff;
  border-left: 2px solid #fff;
  transform: rotate(-45deg);
}

.privacy-strip > div:nth-child(2) {
  margin-right: auto;
}

.privacy-strip strong {
  font-size: 12px;
}

.privacy-strip p {
  margin: 3px 0 0;
  color: var(--ink-soft);
  font-size: 10px;
}

.offline-tag {
  color: var(--teal);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 22px 38px;
  color: #7c8d99;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

/* 全局轻提示默认隐藏，添加 is-visible 后从底部浮现。 */
.toast {
  position: fixed;
  z-index: 90;
  right: 24px;
  bottom: 24px;
  max-width: min(360px, calc(100vw - 48px));
  padding: 12px 16px;
  border-radius: 11px;
  background: var(--ink);
  color: white;
  box-shadow: 0 12px 30px rgba(16, 42, 67, 0.25);
  font-size: 12px;
  font-weight: 650;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

noscript {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 12px;
  background: var(--danger);
  color: white;
  text-align: center;
}

/* ==================== 响应式布局 ==================== */
/* 中等宽度下将两张工具卡片改为纵向排列。 */
@media (max-width: 1200px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .generator-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  }
}

/* 手机和平板竖屏：缩小留白，并将生成器内部改为单列。 */
@media (max-width: 760px) {
  .header-inner,
  .page-shell,
  footer {
    width: min(100% - 28px, 1500px);
  }

  .header-inner {
    min-height: 68px;
  }

  .page-shell {
    padding-top: 20px;
  }

  .tool-card {
    border-radius: 19px;
  }

  .card-heading {
    min-height: 76px;
    padding: 20px;
  }

  .generator-layout {
    grid-template-columns: 1fr;
  }

  .generator-form {
    padding: 22px 20px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .generator-preview,
  .decoder-body {
    padding: 22px 20px;
  }

  .qr-stage {
    width: min(100%, 390px);
    margin-inline: auto;
  }

  .control-row {
    flex-wrap: wrap;
  }

  .compact-field {
    flex: 1 1 130px;
  }

  .dropzone {
    min-height: 235px;
  }
}

/* 极窄屏幕：隐藏次要文案，并让操作按钮占满一行。 */
@media (max-width: 480px) {
  .brand-copy small,
  .heading-note,
  .offline-tag {
    display: none;
  }

  .local-pill {
    padding: 7px 10px;
    font-size: 10px;
  }

  .color-controls {
    grid-template-columns: 1fr;
  }

  .angle-field {
    grid-column: auto;
  }

  .logo-upload-row {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .logo-file-copy {
    flex: 1 1 140px;
  }

  .download-actions {
    grid-template-columns: 1fr;
  }

  .privacy-strip {
    align-items: flex-start;
    padding: 17px;
  }

  footer {
    justify-content: center;
  }

  footer span:last-child {
    display: none;
  }
}

/* 尊重系统“减少动态效果”偏好，避免旋转和位移动画造成不适。 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}