:root {
  --color-bg: oklch(0.97 0.012 45);
  --color-surface: oklch(0.995 0.004 45);
  --color-panel: oklch(0.99 0.006 45);
  --color-panel-strong: oklch(0.94 0.02 42);
  --color-text: oklch(0.23 0.02 35);
  --color-text-soft: oklch(0.45 0.015 34);
  --color-text-mute: oklch(0.62 0.012 35);
  --color-line: oklch(0.9 0.012 40);
  --color-line-strong: oklch(0.82 0.014 38);
  --color-brand: oklch(0.57 0.23 28);
  --color-brand-deep: oklch(0.45 0.18 28);
  --color-brand-soft: oklch(0.93 0.04 32);
  --color-dark: oklch(0.22 0.018 35);
  --color-dark-soft: oklch(0.32 0.018 35);
  --color-on-dark: oklch(0.92 0.008 40);
  --color-on-dark-mute: oklch(0.7 0.012 38);
  --shadow-sm: 0 8px 20px color-mix(in srgb, var(--color-text) 6%, transparent);
  --shadow-md: 0 18px 48px color-mix(in srgb, var(--color-text) 10%, transparent);
  --shadow-lg: 0 32px 80px color-mix(in srgb, var(--color-text) 14%, transparent);
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.4rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", sans-serif;
  --motion-short: 180ms;
  --motion-medium: 420ms;
  --motion-long: 640ms;
  --topbar-height: 38px;
  --nav-height: 72px;
  --site-width: min(1240px, calc(100% - 40px));
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-height) + var(--nav-height) + 8px);
}

body {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.68;
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; }
strong { font-weight: 600; }

/* ============ Top bar (深墨色窄条) ============ */
.topbar {
  background: var(--color-dark);
  color: var(--color-on-dark);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  position: sticky;
  top: 0;
  z-index: 40;
}

.topbar-inner {
  width: var(--site-width);
  margin: 0 auto;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  color: var(--color-on-dark-mute);
}

.topbar-left a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-on-dark);
  transition: color var(--motion-short) ease-out;
}

.topbar-left a:hover { color: var(--color-brand-soft); }

.topbar-left svg {
  width: 13px;
  height: 13px;
  stroke: currentColor;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 1px;
  background: color-mix(in srgb, var(--color-on-dark) 8%, transparent);
  border-radius: 4px;
  padding: 2px;
}

.lang-switch a {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  color: var(--color-on-dark-mute);
  border-radius: 3px;
  transition: color var(--motion-short) ease-out, background-color var(--motion-short) ease-out;
}

.lang-switch a:hover { color: var(--color-on-dark); }
.lang-switch a.active {
  background: var(--color-on-dark);
  color: var(--color-dark);
  font-weight: 600;
}

/* ============ Main navigation (白底) ============ */
.site-header {
  position: sticky;
  top: var(--topbar-height);
  z-index: 30;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow var(--motion-short) ease-out;
}

.site-header.scrolled {
  box-shadow: 0 1px 0 var(--color-line), 0 6px 18px color-mix(in srgb, var(--color-text) 5%, transparent);
}

.nav-shell {
  width: var(--site-width);
  margin: 0 auto;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand img {
  height: 44px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-left: var(--space-lg);
}

.nav-links a {
  position: relative;
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
  padding: 6px 0;
  transition: color var(--motion-short) ease-out;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--color-brand);
  transition: right var(--motion-medium) cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-links a:hover { color: var(--color-brand-deep); }
.nav-links a:hover::after { right: 0; }

.header-cta {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-brand);
  color: var(--color-surface);
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 1px 0 var(--color-brand-deep) inset;
  transition: background-color var(--motion-short) ease-out, transform var(--motion-short) ease-out;
}

.header-cta:hover { background: var(--color-brand-deep); }
.header-cta:active { transform: translateY(1px); }

.header-cta svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: 4px;
  width: 38px;
  height: 38px;
  position: relative;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  display: block;
  position: absolute;
  left: 8px;
  right: 8px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--motion-short) ease-out, opacity var(--motion-short) ease-out;
}
.menu-toggle span { top: 50%; transform: translateY(-1px); }
.menu-toggle span::before { top: -8px; }
.menu-toggle span::after { top: 8px; }

/* ============ Hero (单图大 banner) ============ */
.hero {
  position: relative;
  min-height: clamp(440px, 64vh, 640px);
  display: grid;
  align-items: center;
  overflow: hidden;
  background: var(--color-dark);
  color: var(--color-on-dark);
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.88) brightness(0.78);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(110deg, color-mix(in srgb, var(--color-dark) 88%, transparent) 0%, color-mix(in srgb, var(--color-dark) 50%, transparent) 55%, color-mix(in srgb, var(--color-dark) 18%, transparent) 100%),
    linear-gradient(180deg, color-mix(in srgb, var(--color-dark) 30%, transparent) 0%, transparent 40%, color-mix(in srgb, var(--color-dark) 32%, transparent) 100%);
}

.hero-inner {
  width: var(--site-width);
  margin: 0 auto;
  padding: clamp(3rem, 8vh, 5rem) 0;
  max-width: 720px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 13px;
  color: var(--color-on-dark-mute);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 1.4rem;
}

.hero-eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--color-brand);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  line-height: 1.18;
  font-weight: 600;
  margin: 0 0 1.2rem;
  letter-spacing: 0.01em;
}

.hero h1 em {
  font-style: normal;
  color: var(--color-brand-soft);
}

.hero-sub {
  font-size: clamp(15px, 1.15vw, 17px);
  color: var(--color-on-dark);
  opacity: 0.86;
  max-width: 540px;
  margin: 0 0 2.2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: background-color var(--motion-short) ease-out, color var(--motion-short) ease-out, border-color var(--motion-short) ease-out, transform var(--motion-short) ease-out;
}

.btn svg { width: 15px; height: 15px; stroke: currentColor; }

.btn-primary {
  background: var(--color-brand);
  color: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-brand-deep) inset;
}
.btn-primary:hover { background: var(--color-brand-deep); }
.btn-primary:active { transform: translateY(1px); }

.btn-outline {
  background: transparent;
  color: var(--color-on-dark);
  border-color: color-mix(in srgb, var(--color-on-dark) 40%, transparent);
}
.btn-outline:hover {
  background: color-mix(in srgb, var(--color-on-dark) 10%, transparent);
  border-color: var(--color-on-dark);
}

.btn-ghost {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-line-strong);
}
.btn-ghost:hover {
  background: var(--color-panel-strong);
  border-color: var(--color-text-mute);
}

/* ============ Section base ============ */
.section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
  background: var(--color-bg);
}

.section.alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.container {
  width: var(--site-width);
  margin: 0 auto;
}

.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-line);
}

.section-head .eyebrow {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand);
  font-weight: 600;
  margin-bottom: 0.6rem;
  display: block;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 600;
  margin: 0;
  line-height: 1.3;
  letter-spacing: 0.005em;
}

.section-head p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.7;
  max-width: 520px;
  justify-self: end;
  text-align: right;
}

@media (max-width: 720px) {
  .section-head {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .section-head p { justify-self: start; text-align: left; }
}

/* ============ Service matrix (业务方阵 4 列) ============ */
.service-matrix {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.service-block {
  background: var(--color-surface);
  padding: clamp(1.6rem, 2.4vw, 2.2rem);
  display: flex;
  flex-direction: column;
  min-height: 280px;
  transition: background-color var(--motion-medium) ease-out;
}

.service-block:hover {
  background: var(--color-panel);
}

.service-num {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-brand);
  letter-spacing: 0.1em;
  margin-bottom: 1.2rem;
}

.service-block h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 0.7rem;
  letter-spacing: 0.01em;
}

.service-block p {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.65;
  margin: 0 0 1.2rem;
  flex-grow: 1;
}

.service-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
}

.service-tags li {
  font-size: 12.5px;
  color: var(--color-text-mute);
  letter-spacing: 0.01em;
}

.service-tags li:not(:last-child)::after {
  content: "·";
  margin-left: 10px;
  color: var(--color-line-strong);
}

/* ============ Evidence (实景大图 3 列) ============ */
.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.evidence-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.evidence-card button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.evidence-card .evidence-img {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-panel-strong);
}

.evidence-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--motion-long) cubic-bezier(0.22, 1, 0.36, 1);
}

.evidence-card:hover img { transform: scale(1.04); }

.evidence-meta {
  padding: 1.1rem 1.3rem 1.3rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  border-top: 1px solid var(--color-line);
}

.evidence-meta strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
}

.evidence-meta span {
  font-size: 13px;
  color: var(--color-text-mute);
  letter-spacing: 0.01em;
}

/* ============ About (双栏 + timeline) ============ */
.about-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.about-copy .eyebrow {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand);
  font-weight: 600;
  margin-bottom: 0.8rem;
  display: block;
}

.about-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.6vw, 2rem);
  font-weight: 600;
  line-height: 1.32;
  margin: 0 0 1.2rem;
}

.about-copy p {
  font-size: 15.5px;
  color: var(--color-text-soft);
  line-height: 1.8;
  margin: 0 0 1.6rem;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 2rem;
  border-top: 1px solid var(--color-line);
  padding-top: 1.6rem;
}

.timeline div {
  position: relative;
  padding-right: 0.6rem;
}

.timeline div:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-line);
}

.timeline strong {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-brand-deep);
  display: block;
  margin-bottom: 0.3rem;
}

.timeline span {
  font-size: 13px;
  color: var(--color-text-mute);
}

.about-photo {
  margin: 0;
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--color-panel-strong);
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-photo::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 40%;
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--color-dark) 20%, transparent));
  pointer-events: none;
}

/* ============ Process (4 步) ============ */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.process-step {
  padding: 1.8rem 1.6rem;
  border-right: 1px solid var(--color-line);
  position: relative;
}

.process-step:last-child { border-right: 0; }

.process-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 500;
  color: var(--color-brand);
  line-height: 1;
  margin-bottom: 1rem;
  display: block;
}

.process-step h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.process-step p {
  font-size: 13.5px;
  color: var(--color-text-soft);
  line-height: 1.65;
  margin: 0;
}

/* ============ Contact (双栏) ============ */
.contact-layout {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: clamp(2rem, 4vw, 3rem);
}

.contact-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  padding: clamp(1.8rem, 3vw, 2.4rem);
}

.contact-panel .eyebrow {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-brand);
  font-weight: 600;
  margin-bottom: 0.8rem;
  display: block;
}

.contact-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.2vw, 1.7rem);
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 1rem;
}

.contact-panel > p {
  font-size: 14.5px;
  color: var(--color-text-soft);
  line-height: 1.75;
  margin: 0 0 1.8rem;
}

.contact-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.contact-list > * {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.2rem 1.3rem;
  background: var(--color-surface);
  text-align: left;
  border: 0;
  cursor: inherit;
  font: inherit;
  color: inherit;
  transition: background-color var(--motion-short) ease-out;
}

.contact-list a,
.contact-list button {
  cursor: pointer;
}

.contact-list a:hover,
.contact-list button:hover {
  background: var(--color-panel-strong);
}

.contact-list span {
  font-size: 12px;
  color: var(--color-text-mute);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.contact-list strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.contact-side {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.qr-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  padding: 1.5rem;
  text-align: center;
}

.qr-card img {
  width: 160px;
  height: 160px;
  margin: 0 auto 0.9rem;
  object-fit: contain;
  background: var(--color-panel);
  padding: 8px;
  border: 1px solid var(--color-line);
}

.qr-card strong {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  display: block;
  margin-bottom: 0.25rem;
}

.qr-card p {
  font-size: 12.5px;
  color: var(--color-text-mute);
  margin: 0;
  line-height: 1.6;
}

.address-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  padding: 1.3rem 1.5rem;
}

.address-card strong {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  display: block;
  margin-bottom: 0.4rem;
}

.address-card p {
  font-size: 13px;
  color: var(--color-text-soft);
  line-height: 1.65;
  margin: 0 0 1rem;
}

.address-card .btn {
  padding: 8px 14px;
  font-size: 13px;
  width: 100%;
  justify-content: center;
}

/* ============ Footer ============ */
.site-footer {
  background: var(--color-dark);
  color: var(--color-on-dark-mute);
  font-size: 13px;
  padding: 2.5rem 0 2rem;
  border-top: 3px solid var(--color-brand);
}

.footer-inner {
  width: var(--site-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: center;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--color-on-dark);
}

.footer-brand img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1) opacity(0.92);
}

.footer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  justify-content: center;
}

.footer-tags span {
  font-size: 12px;
  color: var(--color-on-dark-mute);
  letter-spacing: 0.04em;
}

.footer-meta {
  text-align: right;
  font-size: 12px;
  color: var(--color-on-dark-mute);
  line-height: 1.7;
}

.footer-meta a:hover { color: var(--color-on-dark); }

/* ============ Lightbox & toast (沿用现有交互) ============ */
.lightbox {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--color-dark) 88%, transparent);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.lightbox.open {
  display: flex;
  animation: fadeIn var(--motion-medium) ease-out;
}

.lightbox img {
  max-width: min(1100px, 92vw);
  max-height: 86vh;
  object-fit: contain;
  box-shadow: var(--shadow-lg);
}

.lightbox button {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  border: 0;
  font-size: 22px;
  line-height: 1;
}

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-dark);
  color: var(--color-on-dark);
  padding: 10px 22px;
  border-radius: 4px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-medium) ease-out, transform var(--motion-medium) ease-out;
  z-index: 110;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ============ Reveal animation (克制) ============ */
.motion-ready .reveal,
.motion-ready .reveal-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--motion-long) cubic-bezier(0.22, 1, 0.36, 1) var(--reveal-delay, 0ms),
              transform var(--motion-long) cubic-bezier(0.22, 1, 0.36, 1) var(--reveal-delay, 0ms);
}

.motion-ready .revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .service-matrix { grid-template-columns: repeat(2, 1fr); }
  .evidence-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .process-step:nth-child(2) { border-right: 0; }
  .process-step:nth-child(1),
  .process-step:nth-child(2) { border-bottom: 1px solid var(--color-line); }
  .about-layout { grid-template-columns: 1fr; }
  .about-photo { aspect-ratio: 16 / 10; max-height: 420px; }
  .contact-layout { grid-template-columns: 1fr; }
  .nav-links { gap: 1.5rem; }
}

@media (max-width: 720px) {
  :root { --topbar-height: 36px; --nav-height: 64px; }
  .topbar-inner { font-size: 12px; }
  .topbar-left { gap: 0.8rem; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 0.5rem 0;
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--motion-medium) ease-out, opacity var(--motion-medium) ease-out;
  }
  .nav-links.open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    padding: 14px 24px;
    border-bottom: 1px solid var(--color-line);
  }
  .nav-links a::after { display: none; }
  .menu-toggle { display: block; }
  .header-cta { display: none; }
  .nav-shell { gap: 0; }
  .brand img { height: 36px; }
  .service-matrix { grid-template-columns: 1fr; }
  .service-block { min-height: auto; }
  .evidence-grid { grid-template-columns: 1fr; gap: 1rem; }
  .process-grid { grid-template-columns: 1fr; }
  .process-step { border-right: 0; border-bottom: 1px solid var(--color-line); }
  .process-step:last-child { border-bottom: 0; }
  .timeline { grid-template-columns: repeat(2, 1fr); gap: 1rem 0; }
  .timeline div:nth-child(2)::after { display: none; }
  .contact-list { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; gap: 0.8rem; }
  .footer-tags { justify-content: center; }
  .footer-meta { text-align: center; }
  .footer-brand { justify-content: center; }
  .hero-inner { padding: 3.5rem 0; }
}

/* ============ Print-safe ============ */
@media print {
  .topbar, .site-header, .lightbox, .toast { display: none; }
  body { background: white; }
}