:root {
  --bg: #f4f7f8;
  --surface: #ffffff;
  --surface-soft: #eef3f4;
  --surface-tint: #f8faf5;
  --ink: #16212b;
  --muted: #5d6975;
  --muted-strong: #3b4650;
  --line: #d9e0e4;
  --line-strong: #c4cdd3;
  --accent: #0e6f74;
  --accent-deep: #084f55;
  --accent-blue: #334e9b;
  --accent-warm: #ad5a32;
  --shadow: 0 14px 34px rgba(22, 33, 43, 0.08);
  --radius: 8px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: "Manrope", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.58;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

img,
video {
  max-width: 100%;
}

.page-shell {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 72px;
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 40;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  align-items: center;
  gap: 16px;
  min-height: 72px;
  margin-bottom: 18px;
  padding: 10px 12px;
  border: 1px solid rgba(217, 224, 228, 0.92);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 28px rgba(22, 33, 43, 0.08);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  letter-spacing: 0;
}

.brand-copy {
  display: grid;
  min-width: 0;
  gap: 1px;
}

.brand-copy strong {
  overflow: hidden;
  font-size: 1rem;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy span {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.86rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-self: center;
  gap: 10px;
  min-width: 0;
}

.section-links {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--muted-strong);
  font-size: 0.88rem;
  font-weight: 700;
}

.section-links a,
.mini-program-trigger {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  white-space: nowrap;
}

.section-links a:hover,
.mini-program-trigger:hover,
.mini-program-trigger:focus-visible {
  background: var(--surface);
  color: var(--accent-deep);
  outline: none;
}

.mini-program-nav {
  position: relative;
  display: inline-flex;
}

.mini-program-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 90;
  width: 188px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  pointer-events: none;
}

.mini-program-popover img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 6px;
}

.mini-program-nav:hover .mini-program-popover,
.mini-program-nav:focus-within .mini-program-popover {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.lang-switch {
  display: inline-flex;
  gap: 2px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.lang-btn {
  min-height: 34px;
  padding: 0 12px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 800;
}

.lang-btn.is-active {
  background: var(--ink);
  color: #ffffff;
}

.ai-launcher {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 13px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: var(--ink);
  color: #ffffff;
  font-weight: 800;
}

.ai-launcher:hover {
  background: #22303c;
}

.ai-launcher-icon {
  display: inline-grid;
  place-items: center;
  min-width: 24px;
  height: 24px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.14);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0;
}

.ai-launcher-text {
  font-size: 0.88rem;
  line-height: 1;
  white-space: nowrap;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(390px, 0.97fr);
  gap: 20px;
  align-items: stretch;
}

.hero-copy,
.video-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  min-height: 560px;
  padding: 34px;
}

.eyebrow,
.section-index {
  margin: 0;
  color: var(--accent-deep);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 18px 0 0;
  max-width: 13ch;
  font-size: 4.25rem;
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-title {
  margin: 20px 0 0;
  max-width: 32rem;
  color: var(--ink);
  font-size: 1.28rem;
  font-weight: 800;
  line-height: 1.38;
}

.hero-summary {
  margin: 16px 0 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1rem;
}

.hero-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.button,
.resource-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  width: fit-content;
  padding: 0 15px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-weight: 800;
  line-height: 1.1;
}

.button-primary {
  background: var(--accent);
  color: #ffffff;
}

.button-primary:hover {
  background: var(--accent-deep);
}

.button-secondary,
.resource-action {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover,
.resource-action:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
}

.resume-downloads {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: auto;
  padding-top: 24px;
}

.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 58px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-tint);
}

.download-card:hover {
  border-color: var(--accent);
}

.download-label {
  min-width: 0;
  color: var(--muted-strong);
  font-size: 0.94rem;
  font-weight: 700;
}

.download-card strong {
  flex: 0 0 auto;
  color: var(--accent-blue);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
}

.video-card {
  display: flex;
  flex-direction: column;
  padding: 16px 16px 0;
}

.video-card-head {
  display: grid;
  gap: 8px;
  padding: 6px 4px 14px;
}

.video-label {
  margin: 4px 0 0;
  font-size: 1.24rem;
  line-height: 1.2;
}

.video-note {
  margin: 0;
  max-width: 36rem;
  color: var(--muted);
}

.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: auto;
  align-self: stretch;
  overflow: hidden;
  border: 1px solid #1b2833;
  border-radius: var(--radius);
  background: #111820;
}

.intro-video {
  display: block;
  width: 100%;
  height: 100%;
  background: #111820;
  object-fit: contain;
}

.video-state {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: end;
  gap: 8px;
  padding: 24px;
  color: #ffffff;
  background: linear-gradient(180deg, rgba(17, 24, 32, 0.12), rgba(17, 24, 32, 0.82));
  pointer-events: none;
}

.video-frame.is-ready .video-state {
  opacity: 0;
  visibility: hidden;
}

.video-chip {
  width: fit-content;
  padding: 6px 8px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.12);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
}

.video-state h2 {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.1;
}

.video-state p {
  margin: 0;
  max-width: 24rem;
  color: rgba(255, 255, 255, 0.82);
}

.metric-grid,
.feature-grid,
.section-block,
.profile-grid {
  margin-top: 24px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric-card,
.feature-card,
.timeline-item,
.project-card,
.skill-group,
.yuque-card,
.contact-card,
.education-item,
.visual-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(22, 33, 43, 0.04);
}

.metric-card {
  min-height: 112px;
  padding: 18px;
}

.metric-value {
  color: var(--ink);
  font-size: 1.34rem;
  font-weight: 800;
  line-height: 1.16;
}

.metric-label {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.feature-card {
  padding: 20px;
  border-top: 4px solid var(--accent);
}

.feature-card:nth-child(2) {
  border-top-color: var(--accent-blue);
}

.feature-card:nth-child(3) {
  border-top-color: var(--accent-warm);
}

.feature-card h3 {
  margin: 0;
  font-size: 1.04rem;
}

.feature-card p {
  margin: 8px 0 0;
  color: var(--muted);
}

.section-block {
  padding-top: 10px;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.section-head h2 {
  margin: 0;
  font-size: 1.32rem;
  line-height: 1.2;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-item {
  display: grid;
  grid-template-columns: minmax(220px, 0.32fr) minmax(0, 0.68fr);
  gap: 18px;
  padding: 20px;
}

.timeline-role {
  margin: 0;
  font-size: 1.04rem;
  font-weight: 800;
  line-height: 1.26;
}

.timeline-company {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.timeline-list,
.project-list,
.skill-list,
.language-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline-list {
  display: grid;
  gap: 8px;
}

.timeline-list li,
.project-list li {
  position: relative;
  padding-left: 18px;
  color: var(--muted-strong);
}

.timeline-list li::before,
.project-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.project-card {
  display: grid;
  align-content: start;
  gap: 10px;
  min-height: 280px;
  padding: 20px;
}

.project-card h3 {
  margin: 0;
  font-size: 1.08rem;
}

.project-stack {
  margin: 0;
  color: var(--accent-blue);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  font-weight: 600;
}

.project-copy {
  margin: 0;
  color: var(--muted);
}

.project-list {
  display: grid;
  gap: 7px;
  margin-top: 2px;
}

.skill-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.skill-group {
  padding: 18px;
}

.skill-group h3 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-list li,
.language-list span {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  color: var(--muted-strong);
  font-size: 0.88rem;
  font-weight: 700;
}

.panel-intro {
  margin: -4px 0 14px;
  max-width: 56rem;
  color: var(--muted);
}

.yuque-grid,
.contact-grid,
.visual-grid {
  display: grid;
  gap: 12px;
}

.yuque-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.yuque-card {
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 16px;
  padding: 18px;
}

.yuque-copy {
  display: grid;
  align-content: start;
  gap: 10px;
}

.yuque-meta,
.contact-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.yuque-card h3,
.contact-card h3 {
  margin: 0;
  font-size: 1.04rem;
}

.yuque-chip,
.contact-chip {
  flex: 0 0 auto;
  padding: 5px 7px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface-soft);
  color: var(--accent-deep);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
}

.yuque-summary,
.contact-summary,
.contact-value {
  margin: 0;
  color: var(--muted);
}

.contact-value {
  margin-top: 4px;
  color: var(--ink);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.qr-wrap {
  display: grid;
  justify-items: start;
  gap: 8px;
}

.qr-wrap img {
  display: block;
  width: 132px;
  aspect-ratio: 1;
  object-fit: contain;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.qr-caption {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.contact-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.contact-card {
  display: grid;
  gap: 14px;
  min-height: 230px;
  padding: 18px;
}

.contact-copy {
  display: grid;
  align-content: start;
  gap: 12px;
}

.contact-status {
  min-height: 1.35em;
  margin: 0;
  color: var(--accent-deep);
  font-size: 0.9rem;
}

.profile-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.education-list {
  display: grid;
  gap: 12px;
}

.education-item {
  padding: 18px;
}

.education-item h3 {
  margin: 0;
  font-size: 1rem;
}

.education-item p {
  margin: 6px 0 0;
  color: var(--muted);
}

.education-gallery {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}

.education-media {
  margin-top: 14px;
}

.education-gallery img,
.education-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.language-box {
  margin-top: 14px;
}

.language-title {
  margin: 0 0 10px;
  font-weight: 800;
}

.language-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.visual-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.visual-card {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  min-height: 160px;
  padding: 14px;
}

.visual-media {
  position: relative;
  display: block;
  width: 118px;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius);
  background: var(--surface-soft);
  padding: 0;
}

.visual-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.visual-media-link {
  cursor: pointer;
}

.visual-play {
  position: absolute;
  left: 8px;
  bottom: 8px;
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 0 8px;
  border-radius: 4px;
  background: rgba(22, 33, 43, 0.82);
  color: #ffffff;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  font-weight: 600;
}

.visual-copy {
  display: grid;
  gap: 6px;
}

.visual-kicker {
  color: var(--accent-deep);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
}

.visual-copy h3,
.visual-copy p {
  margin: 0;
}

.visual-copy h3 {
  font-size: 1rem;
}

.visual-copy p {
  color: var(--muted);
  font-size: 0.92rem;
}

.preview-float {
  position: fixed;
  right: 24px;
  bottom: 86px;
  z-index: 26;
  width: min(340px, calc(100vw - 24px));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preview-float.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.preview-float-panel {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.preview-float-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.preview-float-head h3 {
  margin: 0;
  font-size: 1rem;
}

.preview-float-close,
.ai-widget-close {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font-size: 1.2rem;
  line-height: 1;
}

.preview-float-body {
  display: grid;
  gap: 10px;
  max-height: min(72vh, 640px);
  overflow: auto;
}

.preview-float-video {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 16;
  max-height: min(54vh, 420px);
  border-radius: var(--radius);
  background: #111820;
}

.preview-media-stack {
  display: grid;
  gap: 10px;
}

.preview-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.preview-gallery img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.ai-widget {
  position: fixed;
  top: 96px;
  right: max(16px, calc((100vw - var(--max-width)) / 2 + 16px));
  z-index: 50;
  width: min(440px, calc(100vw - 32px));
}

.ai-widget[hidden] {
  display: none;
}

.ai-widget-panel {
  max-height: min(74vh, 690px);
  padding: 18px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.ai-widget-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.ai-widget-head h2 {
  margin: 4px 0 0;
  font-size: 1.08rem;
}

.ask-layout,
.ask-copy,
.ask-shell,
.ask-form,
.ask-answer-card {
  display: grid;
  gap: 12px;
}

.ask-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.ask-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ask-suggestion {
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  color: var(--muted-strong);
  font-size: 0.86rem;
  font-weight: 700;
}

.ask-form,
.ask-answer-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-tint);
}

.ask-input {
  width: 100%;
  min-height: 104px;
  resize: vertical;
  padding: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  outline: none;
}

.ask-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(14, 111, 116, 0.12);
}

.ask-input:disabled,
.ask-submit:disabled,
.ask-suggestion:disabled {
  cursor: not-allowed;
  opacity: 0.68;
}

.ask-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ask-submit {
  min-width: 132px;
}

.ask-status,
.ask-answer,
.ask-answer-label {
  margin: 0;
}

.ask-status {
  min-height: 1.35em;
  color: var(--muted);
  font-size: 0.9rem;
}

.ask-status.is-error {
  color: var(--accent-warm);
}

.ask-status.is-success {
  color: var(--accent);
}

.ask-answer-label {
  color: var(--accent-deep);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
}

.ask-answer {
  max-height: 210px;
  overflow: auto;
  color: var(--muted);
  white-space: pre-wrap;
}

.ask-answer.has-content {
  color: var(--ink);
}

.scroll-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top-arrow {
  line-height: 1;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 1080px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .header-actions {
    grid-column: 1 / -1;
    justify-self: stretch;
  }

  .section-links {
    flex: 1 1 auto;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .section-links::-webkit-scrollbar {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .video-card {
    min-height: auto;
  }

  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .project-grid,
  .skill-groups,
  .profile-grid,
  .timeline-item,
  .visual-grid {
    grid-template-columns: 1fr;
  }

  .yuque-grid,
  .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 190px;
  }

  .page-shell {
    width: min(var(--max-width), calc(100% - 18px));
    padding-top: 10px;
  }

  .site-header {
    top: 8px;
    gap: 10px;
    grid-template-columns: 1fr auto;
    align-items: start;
  }

  .brand-copy strong {
    font-size: 0.94rem;
  }

  .brand-copy span {
    font-size: 0.78rem;
  }

  .header-actions {
    grid-column: 1 / -1;
    grid-row: 2;
    align-items: stretch;
    flex-direction: column;
  }

  .section-links {
    width: 100%;
  }

  .lang-switch {
    align-self: flex-start;
  }

  .ai-launcher {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    padding: 0 10px;
  }

  .ai-launcher-text {
    display: none;
  }

  .hero-copy,
  .video-card {
    padding: 18px;
  }

  h1 {
    font-size: 3rem;
  }

  .hero-title {
    font-size: 1.12rem;
  }

  .hero-actions-row,
  .resume-downloads,
  .metric-grid,
  .feature-grid,
  .yuque-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions-row .button,
  .resource-action,
  .ask-submit {
    width: 100%;
  }

  .feature-grid,
  .metric-grid,
  .project-grid,
  .skill-groups,
  .profile-grid,
  .visual-grid {
    gap: 10px;
  }

  .timeline-item,
  .project-card,
  .skill-group,
  .yuque-card,
  .contact-card,
  .education-item {
    padding: 16px;
  }

  .project-card {
    min-height: auto;
  }

  .education-gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .visual-card {
    grid-template-columns: 96px minmax(0, 1fr);
    min-height: 132px;
    padding: 12px;
  }

  .visual-media {
    width: 96px;
  }

  .ask-actions,
  .contact-top,
  .yuque-meta {
    align-items: stretch;
    flex-direction: column;
  }

  .qr-wrap img {
    width: 154px;
  }

  .ai-widget {
    top: 152px;
    right: 10px;
    width: min(390px, calc(100vw - 20px));
  }

  .preview-float {
    right: 10px;
    bottom: 72px;
    width: min(320px, calc(100vw - 20px));
  }

  .scroll-top {
    right: 10px;
    bottom: 12px;
  }
}