:root {
  --bg: #f4f7fb;
  --bg-soft: #eef3fa;
  --surface: #ffffff;
  --surface-2: #f8fafd;
  --ink: #10203a;
  --ink-soft: #243753;
  --muted: #5b6b82;
  --muted-2: #7d8ca3;
  --line: #dbe4f0;
  --navy: #122a4d;
  --navy-2: #1b3a66;
  --blue: #2563eb;
  --blue-soft: #e8efff;
  --teal: #0f766e;
  --teal-soft: #e6f5f2;
  --amber: #b45309;
  --amber-soft: #fff3e4;
  --danger: #b42318;
  --shadow: 0 24px 60px rgba(18, 42, 77, .09);
  --shadow-sm: 0 8px 24px rgba(18, 42, 77, .07);
  --radius: 22px;
  --radius-sm: 14px;
  --font-sans: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 85% 0%, rgba(37, 99, 235, .06), transparent 60%),
    radial-gradient(700px 420px at 5% 20%, rgba(15, 118, 110, .05), transparent 60%),
    var(--bg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(37, 99, 235, .18); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4, h5, p { margin: 0; }
ul { margin: 0; padding-left: 1.15em; }
li + li { margin-top: .35em; }

.container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

.hero-grid,
.hero-copy,
.hero-visual,
.system-card,
.header-inner,
.about-grid,
.about-copy,
.project-body,
.project-info,
.project-media,
.contact-panel,
.contact-copy,
.contact-list { min-width: 0; }

.mono { font-family: var(--font-mono); }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--blue), var(--teal));
  transition: width .1s linear;
}

/* ============================== HEADER ============================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(244, 247, 251, .84);
  border-bottom: 1px solid rgba(219, 228, 240, .8);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: box-shadow .2s ease;
}
.site-header.scrolled { box-shadow: 0 10px 30px rgba(18, 42, 77, .08); }

.header-inner {
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .05em;
  background: linear-gradient(145deg, var(--navy), #24518c);
  box-shadow: 0 8px 18px rgba(18, 42, 77, .22);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 15px; letter-spacing: .02em; }
.brand-text small { color: var(--muted); font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  margin-right: 4px;
}

.nav a {
  position: relative;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transition: transform .22s ease;
}

.nav a:hover::after,
.nav a.is-active::after { transform: scaleX(1); }
.nav a.is-active { color: var(--navy); }

.header-actions { display: flex; align-items: center; gap: 9px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--navy), #24518c);
  box-shadow: 0 10px 22px rgba(18, 42, 77, .18);
}
.btn-primary:hover { box-shadow: 0 14px 28px rgba(18, 42, 77, .24); }
.btn-secondary {
  color: var(--navy);
  background: #fff;
  border-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: #b9c9dd; }
.btn-ghost { color: var(--ink-soft); background: transparent; border-color: transparent; }
.btn-ghost:hover { background: rgba(18, 42, 77, .05); }
.btn-light { color: var(--navy); background: #fff; box-shadow: 0 12px 26px rgba(0, 0, 0, .18); }
.btn-outline-light { color: #fff; border-color: rgba(255, 255, 255, .38); background: rgba(255, 255, 255, .06); }
.btn-outline-light:hover { background: rgba(255, 255, 255, .12); }

.interview-toggle {
  border-color: var(--line);
  background: rgba(255, 255, 255, .72);
}
.toggle-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #9aa9bd;
  box-shadow: 0 0 0 4px rgba(154, 169, 189, .12);
  transition: background .2s ease, box-shadow .2s ease;
}
body.interview-mode .interview-toggle {
  color: var(--teal);
  border-color: rgba(15, 118, 110, .28);
  background: var(--teal-soft);
}
body.interview-mode .toggle-dot {
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, .14);
}

.menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.menu-btn span {
  display: block;
  height: 2px;
  margin: 4px 0;
  border-radius: 2px;
  background: var(--navy);
  transition: transform .2s ease, opacity .2s ease;
}
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.interview-banner {
  display: none;
  position: relative;
  background: linear-gradient(90deg, #0f766e, #0b5f59);
  color: #fff;
  font-size: 13.5px;
}
body.interview-mode .interview-banner { display: block; }
.interview-banner .container {
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 7px;
  padding-bottom: 7px;
}
.interview-banner strong { white-space: nowrap; }
.interview-banner span { opacity: .9; }
.banner-close {
  margin-left: auto;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 50%;
  color: #fff;
  background: rgba(255, 255, 255, .14);
  line-height: 1;
  font-size: 18px;
}

/* ============================== HERO ============================== */
.hero {
  position: relative;
  padding: 76px 0 34px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(18, 42, 77, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 42, 77, .045) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .55), transparent 72%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .55), transparent 72%);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr);
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--teal);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(15, 118, 110, .35);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(15, 118, 110, .3); }
  70% { box-shadow: 0 0 0 10px rgba(15, 118, 110, 0); }
  100% { box-shadow: 0 0 0 0 rgba(15, 118, 110, 0); }
}

.hero h1 {
  margin-top: 12px;
  font-size: clamp(3.5rem, 7vw, 6rem);
  line-height: .96;
  letter-spacing: -.055em;
  color: var(--navy);
}
.hero h1 .accent { color: var(--blue); }
.hero-role {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: .01em;
}
.hero-desc {
  max-width: 620px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.85;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.hero-tags span {
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, .62);
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.hero-visual { position: relative; }
.system-card {
  position: relative;
  padding: 16px;
  border: 1px solid rgba(146, 176, 218, .22);
  border-radius: 24px;
  color: #dbe7ff;
  background:
    radial-gradient(420px 220px at 100% 0%, rgba(37, 99, 235, .24), transparent 65%),
    radial-gradient(340px 220px at 0% 100%, rgba(15, 118, 110, .18), transparent 60%),
    #0b1424;
  box-shadow: 0 30px 70px rgba(9, 24, 47, .28);
  overflow: hidden;
}
.system-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 100% 28px;
  opacity: .5;
}
.system-card-head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 2px 12px;
  color: #8fa8c8;
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.window-dots { display: inline-flex; gap: 4px; }
.window-dots i { width: 6px; height: 6px; border-radius: 50%; background: #3c5678; }
.window-dots i:nth-child(1) { background: #f87171; }
.window-dots i:nth-child(2) { background: #fbbf24; }
.window-dots i:nth-child(3) { background: #34d399; }
.status-chip {
  margin-left: auto;
  padding: 3px 8px;
  border: 1px solid rgba(96, 165, 250, .28);
  border-radius: 999px;
  color: #93c5fd;
  background: rgba(37, 99, 235, .12);
  font-family: var(--font-mono);
  font-size: 10px;
}
.chip-core {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin: 6px 0 14px;
  padding: 20px 16px 18px;
  border: 1px solid rgba(96, 165, 250, .25);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(37, 99, 235, .2), rgba(37, 99, 235, .05)),
    rgba(255, 255, 255, .02);
  text-align: center;
}
.chip-kicker { color: #7ea6d9; font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .16em; }
.chip-core strong { color: #fff; font-family: var(--font-mono); font-size: 34px; line-height: 1.1; letter-spacing: .02em; text-shadow: 0 0 24px rgba(96, 165, 250, .35); }
.chip-core > span:last-child { color: #93b4d8; font-size: 11.5px; }
.bus-list { position: relative; z-index: 1; display: grid; gap: 4px; }
.bus-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid rgba(146, 176, 218, .12);
  border-radius: 10px;
  background: rgba(255, 255, 255, .025);
  color: #b9cbe3;
  font-size: 11.5px;
}
.bus-tag {
  display: inline-flex;
  justify-content: center;
  padding: 2px 6px;
  border-radius: 5px;
  color: #93c5fd;
  background: rgba(37, 99, 235, .14);
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: .04em;
}
.bus-row:nth-child(2) .bus-tag { color: #5eead4; background: rgba(15, 118, 110, .2); }
.bus-row:nth-child(3) .bus-tag { color: #fcd34d; background: rgba(180, 83, 9, .18); }
.system-card-foot {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 12px;
  padding: 10px 2px 2px;
  border-top: 1px solid rgba(146, 176, 218, .14);
  color: #7894b7;
  font-family: var(--font-mono);
  font-size: 9.5px;
}
.hero-note {
  margin-top: 12px;
  color: var(--muted-2);
  font-size: 12px;
  text-align: center;
  letter-spacing: .02em;
}

.stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 62px;
  padding: 18px;
  border: 1px solid rgba(219, 228, 240, .9);
  border-radius: 20px;
  background: rgba(255, 255, 255, .64);
  backdrop-filter: blur(10px);
}
.stat { padding: 8px 16px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; }
.stat strong { display: block; color: var(--navy); font-family: var(--font-mono); font-size: 28px; line-height: 1.1; letter-spacing: -.03em; }
.stat strong span { color: var(--blue); font-size: 16px; }
.stat small { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }

/* ============================== SECTION ============================== */
.section { padding: 88px 0; scroll-margin-top: 88px; }
.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, .72), rgba(238, 243, 250, .65));
  border-top: 1px solid rgba(219, 228, 240, .7);
  border-bottom: 1px solid rgba(219, 228, 240, .7);
}
.section-kicker {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.section-kicker.light { color: #93c5fd; }
.section h2 {
  margin-top: 10px;
  color: var(--navy);
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -.035em;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 34px;
}
.section-head > p { max-width: 380px; color: var(--muted); font-size: 14px; text-align: right; }
.muted { color: var(--muted-2); font-size: 13px; }

/* ============================== ABOUT ============================== */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr);
  gap: 54px;
  align-items: start;
}
.about-copy p { margin-top: 18px; color: var(--muted); font-size: 15.5px; line-height: 1.9; }
.about-quote {
  position: relative;
  margin-top: 28px;
  padding: 18px 20px 18px 50px;
  border: 1px solid rgba(37, 99, 235, .14);
  border-radius: 16px;
  color: var(--ink-soft);
  background: linear-gradient(135deg, rgba(37, 99, 235, .06), rgba(15, 118, 110, .05));
  font-size: 14px;
  line-height: 1.7;
}
.quote-mark {
  position: absolute;
  left: 16px;
  top: 6px;
  color: rgba(37, 99, 235, .28);
  font-family: Georgia, serif;
  font-size: 46px;
  line-height: 1;
}

.boundary-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.boundary-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.boundary-head span { color: var(--navy); font-size: 14px; font-weight: 800; }
.boundary-head small { color: var(--muted-2); font-size: 10.5px; }
.boundary-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--line);
}
.boundary-item:last-child { border-bottom: 0; padding-bottom: 2px; }
.boundary-num {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: var(--blue);
  background: var(--blue-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
}
.boundary-item:nth-child(3) .boundary-num { color: var(--amber); background: var(--amber-soft); }
.boundary-item:nth-child(4) .boundary-num { color: var(--teal); background: var(--teal-soft); }
.boundary-item strong { display: block; color: var(--ink); font-size: 13.5px; }
.boundary-item p { margin-top: 3px; color: var(--muted); font-size: 12.5px; line-height: 1.65; }

/* ============================== PROJECTS ============================== */
.project-card {
  position: relative;
  padding: 34px;
  border: 1px solid rgba(219, 228, 240, .95);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.project-card + .project-card { margin-top: 28px; }
.project-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--teal));
  opacity: .8;
}
.project-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.project-index-wrap { display: flex; align-items: center; gap: 12px; }
.project-index {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  color: #fff;
  background: var(--navy);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}
.project-kicker { color: var(--muted-2); font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; }
.project-status {
  padding: 5px 10px;
  border: 1px solid rgba(37, 99, 235, .18);
  border-radius: 999px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: .04em;
}
.project-status.status-teal { color: var(--teal); border-color: rgba(15, 118, 110, .18); background: var(--teal-soft); }
.project-card h3 { margin-top: 18px; color: var(--navy); font-size: clamp(1.45rem, 2.8vw, 2rem); letter-spacing: -.03em; }
.project-subtitle { margin-top: 5px; color: var(--blue); font-size: 13px; font-weight: 700; }
.project-summary { max-width: 880px; margin-top: 14px; color: var(--muted); font-size: 14.5px; line-height: 1.85; }
.tag-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.tag-row span {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink-soft);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
}
.project-body {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  gap: 30px;
  margin-top: 28px;
  align-items: start;
}
.project-body-lcd { grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); }
.info-block + .info-block { margin-top: 20px; }
.info-block h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--navy);
  font-size: 13px;
  letter-spacing: .02em;
}
.info-block h4::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .1);
}
.info-block p, .info-block li { color: var(--muted); font-size: 13px; line-height: 1.75; }
.info-block p { margin-top: 7px; }
.info-block ul { margin-top: 7px; padding-left: 1.1em; }
.info-block li::marker { color: #9bb0c8; }

.project-media { margin: 0; }
.image-button {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #0b1424;
  overflow: hidden;
  cursor: zoom-in;
}
.image-button img { width: 100%; height: auto; transition: transform .35s ease; }
.image-button:hover img { transform: scale(1.015); }
.zoom-hint {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 5px 9px;
  border-radius: 999px;
  color: #fff;
  background: rgba(11, 20, 36, .78);
  font-size: 10.5px;
  font-weight: 700;
  backdrop-filter: blur(6px);
}
.project-media figcaption { margin-top: 8px; color: var(--muted-2); font-size: 11.5px; text-align: center; }
.project-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.action-note { color: var(--muted-2); font-size: 11.5px; }

.project-details {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px dashed var(--line);
}
.detail-head { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
.detail-head h4 { color: var(--navy); font-size: 14px; }
.detail-head p { color: var(--muted-2); font-size: 12px; }
.module-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px; }
.module-chip {
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface-2);
}
.module-chip strong { display: block; color: var(--navy); font-size: 12px; }
.module-chip span { display: block; margin-top: 3px; color: var(--blue); font-family: var(--font-mono); font-size: 10px; }
.module-chip small { display: block; margin-top: 2px; color: var(--muted-2); font-size: 10.5px; }
.flow-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 14px; }
.flow-item { display: flex; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.flow-num { color: var(--blue); font-family: var(--font-mono); font-size: 10px; font-weight: 800; }
.flow-item strong { display: block; color: var(--navy); font-size: 12px; }
.flow-item p { margin-top: 3px; color: var(--muted); font-size: 11.5px; line-height: 1.6; }
.boundary-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid rgba(15, 118, 110, .14);
  border-radius: 12px;
  background: var(--teal-soft);
  color: #0c5e57;
  font-size: 11.5px;
}
.boundary-strip span { padding-right: 10px; border-right: 1px solid rgba(15, 118, 110, .18); }
.boundary-strip span:last-child { border-right: 0; }
.detail-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.detail-card { padding: 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-2); }
.detail-card h5 { color: var(--navy); font-size: 12px; }
.detail-card p { margin-top: 4px; color: var(--muted); font-size: 12px; line-height: 1.7; }

/* Interview notes */
.interview-notes {
  display: none;
  margin-top: 22px;
  padding: 16px 18px;
  border: 1px solid rgba(15, 118, 110, .2);
  border-left: 4px solid var(--teal);
  border-radius: 0 14px 14px 0;
  background: linear-gradient(135deg, rgba(15, 118, 110, .07), rgba(37, 99, 235, .04));
}
body.interview-mode .interview-notes { display: block; }
.note-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.note-head span:first-child { color: var(--teal); font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.note-badge { padding: 2px 7px; border-radius: 999px; color: #fff; background: var(--teal); font-family: var(--font-mono); font-size: 9px; }
.interview-notes p { color: var(--ink-soft); font-size: 12.5px; line-height: 1.75; }
.interview-notes p + p { margin-top: 6px; }
.interview-notes strong { color: var(--teal); }

/* LCD demo */
.lcd-demo-wrap { display: flex; justify-content: center; }
#lcd-demo { scroll-margin-top: 100px; }
.lcd-demo {
  width: min(100%, 420px);
  padding: 14px;
  border: 1px solid #cfd9e8;
  border-radius: 20px;
  background: linear-gradient(160deg, #e9eef6, #dbe3ef);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .8), 0 18px 40px rgba(18, 42, 77, .12);
}
.lcd-bezel {
  padding: 10px;
  border-radius: 14px;
  background: #1b2433;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .06);
}
.lcd-screen {
  position: relative;
  min-height: 236px;
  padding: 12px 13px;
  border-radius: 8px;
  color: #b7f7d8;
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .025) 0 1px, transparent 1px 3px),
    radial-gradient(120% 100% at 50% 0%, #123c36, #071613 78%);
  font-family: var(--font-mono);
  overflow: hidden;
  box-shadow: inset 0 0 24px rgba(0, 0, 0, .55);
}
.lcd-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(255, 255, 255, .08), transparent 35%);
}
.lcd-top { display: flex; justify-content: space-between; color: #6fbf9e; font-size: 9px; letter-spacing: .1em; }
.lcd-title { margin-top: 9px; padding-bottom: 7px; border-bottom: 1px solid rgba(183, 247, 216, .2); color: #d9ffe9; font-size: 15px; font-weight: 700; }
.lcd-rows { margin-top: 6px; }
.lcd-row { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-bottom: 1px dotted rgba(183, 247, 216, .12); font-size: 11px; }
.lcd-row:last-child { border-bottom: 0; }
.lcd-row .label { color: #7ed4ae; }
.lcd-row .value { color: #e2fff0; text-align: right; }
.lcd-row.is-active .label, .lcd-row.is-active .value { color: #fff; text-shadow: 0 0 10px rgba(110, 231, 183, .4); }
.lcd-foot { position: absolute; left: 13px; right: 13px; bottom: 9px; display: flex; justify-content: space-between; color: #4f9a7b; font-size: 8px; letter-spacing: .05em; }
.lcd-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-top: 10px; }
.lcd-keys button {
  height: 38px;
  border: 1px solid #c5d0e0;
  border-radius: 9px;
  color: #243753;
  background: linear-gradient(180deg, #fff, #e8edf5);
  box-shadow: 0 2px 0 #b9c5d6;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}
.lcd-keys button:active { transform: translateY(1px); box-shadow: 0 1px 0 #b9c5d6; }
.lcd-hint { margin-top: 9px; color: var(--muted-2); font-size: 10.5px; text-align: center; line-height: 1.5; }

/* ============================== SKILLS ============================== */
.skills-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.skill-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.skill-card:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(18, 42, 77, .1); }
.skill-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: var(--blue);
  background: var(--blue-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}
.skill-card:nth-child(2) .skill-icon { color: var(--teal); background: var(--teal-soft); }
.skill-card:nth-child(3) .skill-icon { color: var(--amber); background: var(--amber-soft); }
.skill-card:nth-child(4) .skill-icon { color: #7c3aed; background: #f1ebff; }
.skill-card:nth-child(5) .skill-icon { color: #0e7490; background: #e0f5fa; }
.skill-card:nth-child(6) .skill-icon { color: #be123c; background: #ffe8ee; }
.skill-card h3 { margin-top: 12px; color: var(--navy); font-size: 14px; }
.skill-card > p { margin-top: 2px; color: var(--muted-2); font-size: 11.5px; }
.skill-card .tag-row { margin-top: 12px; }
.skill-card .tag-row span { font-size: 10px; }
.skills-note { margin-top: 18px; padding: 12px 14px; border: 1px dashed var(--line); border-radius: 12px; color: var(--muted); font-size: 12px; background: rgba(255, 255, 255, .5); }
.skills-note strong { color: var(--ink-soft); }

/* ============================== EDUCATION ============================== */
.education-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); gap: 24px; align-items: stretch; }
.edu-card, .learning-card { padding: 28px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.edu-card h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
.edu-major { margin-top: 6px; color: var(--ink-soft); font-size: 13px; font-weight: 600; }
.edu-card .tag-row { margin-top: 16px; }
.edu-card .muted { margin-top: 16px; }
.learning-card {
  background: linear-gradient(150deg, #0f2a4e, #173f6b);
  color: #dbe7ff;
  border-color: transparent;
}
.learning-kicker { color: #93c5fd; font-family: var(--font-mono); font-size: 10px; font-weight: 800; letter-spacing: .14em; }
.learning-card h3 { margin-top: 8px; color: #fff; font-size: 20px; letter-spacing: -.02em; }
.learning-card ul { margin-top: 14px; padding-left: 1.1em; }
.learning-card li { color: #b9cbe3; font-size: 13px; line-height: 1.7; }
.learning-card li::marker { color: #5eead4; }

/* ============================== CONTACT ============================== */
.contact-section { padding-top: 68px; padding-bottom: 84px; }
.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr);
  gap: 40px;
  padding: 42px;
  border-radius: 28px;
  color: #fff;
  background:
    radial-gradient(500px 260px at 100% 0%, rgba(37, 99, 235, .28), transparent 60%),
    radial-gradient(460px 260px at 0% 100%, rgba(15, 118, 110, .24), transparent 60%),
    linear-gradient(140deg, #0d2342, #122a4d 55%, #173f6b);
  box-shadow: 0 30px 70px rgba(9, 24, 47, .25);
}
.contact-copy h2 { margin-top: 8px; color: #fff; font-size: clamp(1.7rem, 3.4vw, 2.5rem); letter-spacing: -.035em; }
.contact-copy p { max-width: 620px; margin-top: 14px; color: #b9cbe3; font-size: 14px; line-height: 1.8; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.contact-list { display: grid; gap: 8px; align-content: start; }
.contact-list a, .contact-list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 13px;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 11px;
  background: rgba(255, 255, 255, .045);
  transition: background .18s ease, border-color .18s ease;
}
.contact-list a:hover { background: rgba(255, 255, 255, .09); border-color: rgba(255, 255, 255, .22); }
.contact-list span { color: #93b4d8; font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase; }
.contact-list strong { color: #fff; font-size: 13px; font-weight: 600; text-align: right; }

/* ============================== FOOTER ============================== */
.site-footer { padding: 24px 0; border-top: 1px solid rgba(219, 228, 240, .8); background: rgba(255, 255, 255, .35); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--muted-2); font-size: 11.5px; }

/* ============================== LIGHTBOX / TOAST / BACKTOP ============================== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
  background: rgba(7, 16, 30, .86);
  backdrop-filter: blur(10px);
}
.lightbox[hidden] { display: none; }
.lightbox img { max-width: min(1400px, 96vw); max-height: 88vh; border-radius: 12px; box-shadow: 0 30px 80px rgba(0, 0, 0, .45); }
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 20px;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 50%;
  color: #fff;
  background: rgba(255, 255, 255, .08);
  font-size: 24px;
  line-height: 1;
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  z-index: 95;
  transform: translate(-50%, 12px);
  max-width: calc(100% - 32px);
  padding: 9px 16px;
  border-radius: 999px;
  color: #fff;
  background: rgba(18, 42, 77, .94);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .2);
  font-size: 12.5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 50;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--navy);
  background: rgba(255, 255, 255, .9);
  box-shadow: var(--shadow-sm);
  font-size: 17px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { transform: translateY(-2px); }

/* ============================== REVEAL ============================== */
/* Keep content visible even if JS/IntersectionObserver is unavailable. */
.reveal { opacity: 1; transform: none; }

/* ============================== RESPONSIVE ============================== */
@media (max-width: 1020px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-copy { max-width: 760px; }
  .hero-visual { max-width: 620px; width: 100%; margin: 0 auto; }
  .stats { margin-top: 42px; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .project-body, .project-body-lcd { grid-template-columns: 1fr; }
  .project-media { order: -1; }
  .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .education-grid { grid-template-columns: 1fr; }
  .contact-panel { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 900px) {
  .container { width: min(100% - 36px, 1160px); }
  .nav {
    position: absolute;
    top: 74px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(255, 255, 255, .98);
    box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .nav a { padding: 11px 12px; border-radius: 9px; }
  .nav a:hover, .nav a.is-active { background: var(--bg-soft); }
  .nav a::after { display: none; }
  .menu-btn { display: block; }
  .header-resume { display: none; }
  .section { padding: 68px 0; }
  .section-head { display: block; }
  .section-head > p { margin-top: 8px; text-align: left; }
  .module-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .flow-grid { grid-template-columns: 1fr; }
  .project-card { padding: 26px; }
  .project-top { align-items: flex-start; }
  .project-status { flex-shrink: 0; }
}

@media (max-width: 720px) {
  .header-inner { height: 66px; }
  .nav { top: 66px; }
  .brand-text small { display: none; }
  .hero { padding-top: 52px; }
  .hero h1 { font-size: clamp(3.2rem, 16vw, 4.6rem); }
  .hero-desc { font-size: 14.5px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 10px; }
  .stat { padding: 10px 14px; border-left: 0; border-top: 1px solid var(--line); }
  .stat:nth-child(-n+2) { border-top: 0; }
  .stat:nth-child(odd) { border-right: 1px solid var(--line); }
  .project-card { padding: 22px; border-radius: 22px; }
  .project-card h3 { font-size: 1.35rem; }
  .project-index { width: 34px; height: 34px; }
  .project-kicker { font-size: 9.5px; }
  .project-status { font-size: 9.5px; padding: 4px 8px; }
  .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .detail-head { display: block; }
  .detail-head p { margin-top: 3px; }
  .detail-grid { grid-template-columns: 1fr; }
  .contact-panel { padding: 26px; border-radius: 22px; }
  .contact-list a, .contact-list > div { flex-direction: column; align-items: flex-start; gap: 3px; }
  .contact-list strong { text-align: left; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 5px; }
  .back-top { right: 14px; bottom: 14px; }
  .lightbox { padding: 12px; }
}

@media (max-width: 560px) {
  .container { width: calc(100% - 28px); }
  .header-actions { gap: 6px; }
  .interview-toggle { padding: 0 10px; }
  .toggle-label { display: none; }
  .brand-mark { width: 36px; height: 36px; border-radius: 10px; }
  .brand-text strong { font-size: 14px; }
  .hero-role { font-size: 1.05rem; }
  .hero-tags span { font-size: 10.5px; }
  .hero-notes { font-size: 10.5px; }
  .section { padding: 56px 0; }
  .section h2 { font-size: 1.6rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr 1fr; gap: 7px; }
  .module-chip { padding: 9px 10px; }
  .project-actions { align-items: stretch; }
  .project-actions .btn { flex: 1 1 auto; }
  .action-note { flex-basis: 100%; }
  .lcd-demo { padding: 10px; }
  .lcd-screen { min-height: 220px; }
  .lcd-keys button { height: 34px; }
  .contact-actions .btn { flex: 1 1 auto; }
  .interview-banner .container { align-items: flex-start; gap: 6px; padding-right: 34px; }
  .interview-banner span { display: none; }
  .banner-close { position: absolute; right: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .site-header, .interview-banner, .hero-actions, .project-actions, .back-top, .toast, .lightbox, .scroll-progress { display: none !important; }
  body { background: #fff; }
  .section, .hero { padding: 24px 0; }
  .project-card, .skill-card, .boundary-card, .contact-panel { box-shadow: none; break-inside: avoid; }
  .project-card { border: 1px solid #ccc; }
  .contact-panel { color: #000; background: #fff; border: 1px solid #ccc; }
  .contact-copy h2, .contact-copy p, .contact-list strong, .contact-list span { color: #000; }
}