:root {
  color-scheme: light;
  --paper: #ffffff;
  --paper-deep: #f3f8fc;
  --ink: #132b3b;
  --muted: #627786;
  --line: #dce9f2;
  --accent: #2780bb;
  --accent-dark: #1d6798;
  --white: #ffffff;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

a { color: inherit; }

img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 20;
  padding: .65rem 1rem;
  background: var(--ink);
  color: white;
}

.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .88);
  box-shadow: 0 8px 30px rgba(22, 76, 112, .05);
  backdrop-filter: blur(18px);
}

.nav,
.container {
  width: min(calc(100% - 2.5rem), var(--max-width));
  margin-inline: auto;
}

.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.identity {
  display: inline-flex;
  align-items: baseline;
  gap: .7rem;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.22rem;
}

.identity small {
  color: var(--muted);
  font-family: inherit;
  font-size: .76rem;
  font-weight: 400;
  letter-spacing: .14em;
}

.nav-links { display: flex; gap: 1.6rem; }

.nav-links a {
  padding: .32rem .72rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: .92rem;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="page"] {
  background: #eaf5fc;
  color: var(--accent-dark);
}

.hero {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(260px, .7fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 7rem);
  padding-block: 6rem;
  background:
    radial-gradient(circle at 83% 25%, rgba(39, 128, 187, .16), transparent 24rem),
    linear-gradient(180deg, #ffffff 0%, #f8fbfe 100%);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-weight: 700;
  font-size: .82rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin: 0;
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.2;
}

h1 { font-size: clamp(2.7rem, 7vw, 5.8rem); font-weight: 800; letter-spacing: -.055em; }
h2 { font-size: clamp(1.75rem, 3vw, 2.7rem); font-weight: 750; letter-spacing: -.025em; }
h3 { font-size: 1.3rem; font-weight: 700; }

.lead {
  max-width: 43rem;
  margin: 1.8rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.24rem);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.2rem; }

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: .55rem 1.2rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: var(--white);
  font-size: .93rem;
  text-decoration: none;
}

.button.secondary { background: white; color: var(--accent-dark); }
.button:hover, .button:focus-visible { background: var(--accent-dark); border-color: var(--accent-dark); color: white; }

.portrait-wrap { position: relative; isolation: isolate; }

.portrait-wrap::before {
  content: "";
  position: absolute;
  inset: -24px 18px 20px -24px;
  z-index: -1;
  border-radius: 36% 64% 52% 48% / 45% 38% 62% 55%;
  background: linear-gradient(145deg, #dff2ff, #2780bb);
}

.portrait {
  position: relative;
  width: min(100%, 340px);
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--paper-deep);
  border: 8px solid white;
  border-radius: 28px;
  box-shadow: 0 24px 70px rgba(39, 128, 187, .22);
}

.section { padding-block: 5.4rem; border-top: 1px solid var(--line); }
.section.alt { background: var(--paper-deep); }

.focus-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.focus-card {
  min-height: 230px;
  padding: 1.6rem;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 18px;
  box-shadow: 0 14px 38px rgba(28, 88, 126, .07);
}

.focus-card .focus-number {
  display: block;
  margin-bottom: 3rem;
  color: var(--accent);
  font-weight: 700;
  font-size: .82rem;
}

.focus-card p { margin-bottom: 0; color: var(--muted); font-size: .92rem; }

.section-heading {
  display: grid;
  grid-template-columns: .65fr 1.35fr;
  gap: 2rem;
  margin-bottom: 2.8rem;
}

.section-heading p { max-width: 40rem; margin: .2rem 0 0; color: var(--muted); }

.work-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }

.work-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 46px rgba(28, 88, 126, .08);
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}

.work-card:hover { transform: translateY(-4px); box-shadow: 0 24px 56px rgba(28, 88, 126, .14); }

.work-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; border-bottom: 1px solid var(--line); }
.work-card-content { padding: 1.35rem; }
.work-card-content p { margin: .8rem 0 0; color: var(--muted); font-size: .92rem; }

.meta { display: flex; flex-wrap: wrap; gap: .5rem 1rem; margin-bottom: .7rem; color: var(--accent); font-size: .78rem; }

.note-list { display: grid; border-top: 1px solid var(--line); }

.note-item {
  display: grid;
  grid-template-columns: 8rem 1fr auto;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: padding .2s ease, background .2s ease;
}

.note-item:hover, .note-item:focus-visible { padding-inline: 1rem; background: #f6fbfe; }

.note-item time, .note-item span { color: var(--muted); font-size: .85rem; }
.note-item:hover h3, .note-item:focus-visible h3 { color: var(--accent); }

.page-intro { max-width: 50rem; padding-block: 6rem 4.5rem; }
.page-intro h1 { font-size: clamp(2.7rem, 6vw, 4.8rem); }

.article-list { display: grid; gap: 4rem; padding-bottom: 6rem; }

.article-entry {
  display: grid;
  grid-template-columns: minmax(150px, .35fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.article-entry .article-body { max-width: 42rem; }
.article-entry p { color: var(--muted); }
.article-entry time { color: var(--muted); font-size: .86rem; }

.works-list { display: grid; gap: 5rem; padding-bottom: 6rem; }
.work-feature { display: grid; grid-template-columns: 1.1fr .9fr; gap: 2.5rem; align-items: center; }
.work-feature:nth-child(even) .work-feature-image { order: 2; }
.work-feature-image { border: 1px solid var(--line); border-radius: 20px; background: var(--white); box-shadow: 0 20px 54px rgba(28, 88, 126, .1); overflow: hidden; }
.work-feature-image img { aspect-ratio: 16 / 10; object-fit: cover; }
.work-feature p { color: var(--muted); }
.work-facts { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.3rem; }
.work-facts span { padding: .3rem .7rem; border: 1px solid #c8dfef; border-radius: 999px; background: #f3f9fd; color: var(--accent-dark); font-size: .78rem; }

.about-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(3rem, 8vw, 7rem); padding-bottom: 6rem; }
.about-layout img { width: 100%; max-width: 340px; border: 8px solid white; border-radius: 24px; box-shadow: 0 20px 54px rgba(28, 88, 126, .14); }
.about-copy { max-width: 43rem; }
.about-copy p { color: var(--muted); }
.about-subheading { margin-top: 3.5rem; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 2rem; }
.principles article { padding: 1.2rem; border: 1px solid var(--line); border-top: 3px solid var(--accent); border-radius: 12px; background: #f8fbfe; }
.principles p { margin-bottom: 0; font-size: .9rem; }

.site-footer { padding: 2.4rem 0; border-top: 1px solid var(--line); background: #f8fbfe; color: var(--muted); font-size: .82rem; }
.footer-row { display: flex; justify-content: space-between; gap: 2rem; }
.footer-record {
  color: #8a9094;
  text-decoration: none;
}
.footer-record:hover, .footer-record:focus-visible { color: var(--accent); text-decoration: underline; }

.feedback-shell { width: min(calc(100% - 2.5rem), 760px); margin: 0 auto; padding: 4rem 0; }
.feedback-heading { margin-bottom: 2rem; }
.feedback-heading h1 { font-size: clamp(2.2rem, 6vw, 4rem); }
.feedback-heading p { color: var(--muted); }
.feedback-note { padding: 1rem 1.2rem; border: 1px solid #cfe4f2; border-left: 4px solid var(--accent); border-radius: 10px; background: var(--paper-deep); color: var(--muted); font-size: .9rem; }
.feedback-form { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-top: 2rem; padding: 1.6rem; border: 1px solid var(--line); border-radius: 18px; background: white; box-shadow: 0 20px 54px rgba(28, 88, 126, .08); }
.field { display: grid; gap: .4rem; }
.field.full { grid-column: 1 / -1; }
.field label { font-weight: 600; }
.field small { color: var(--muted); }
input, select, textarea {
  width: 100%;
  border: 1px solid #c6d9e6;
  border-radius: 10px;
  background: var(--white);
  color: var(--ink);
  font: inherit;
  padding: .72rem .8rem;
}
textarea { min-height: 160px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(39, 128, 187, .25); border-color: var(--accent); }
.form-actions { grid-column: 1 / -1; display: flex; align-items: center; gap: 1rem; }
.form-actions button { cursor: pointer; font: inherit; }
.form-actions button:disabled { cursor: wait; opacity: .6; }
.form-status { margin: 0; color: var(--muted); font-size: .9rem; }

@media (max-width: 760px) {
  .nav { align-items: flex-start; flex-direction: column; gap: .8rem; padding: 1rem 0; }
  .nav-links { width: 100%; gap: 1.1rem; overflow-x: auto; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding-block: 4.5rem; }
  .portrait-wrap { width: 70%; margin-left: 24px; }
  .section-heading, .article-entry, .about-layout { grid-template-columns: 1fr; }
  .work-grid, .principles, .focus-grid { grid-template-columns: 1fr; }
  .work-feature { grid-template-columns: 1fr; }
  .work-feature:nth-child(even) .work-feature-image { order: initial; }
  .note-item { grid-template-columns: 1fr; gap: .2rem; }
  .feedback-form { grid-template-columns: 1fr; }
  .field.full, .form-actions { grid-column: 1; }
  .footer-row { flex-direction: column; gap: .4rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }