/* iigtn site shared styles
   Used by index.html / about.html / skills.html / works.html / contact.html / privacy.html */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ── Design tokens ──────────────────────────── */
:root {
  /* Light theme */
  --c-bg: #eef3fa;
  --c-bg-elev: #ffffff;
  --c-surface: #ffffff;
  --c-surface-2: #f5f4f0;
  --c-text: #1a1a1a;
  --c-text-2: #2d2d2d;
  --c-muted: #6b6b6b;
  --c-muted-2: #8a8a8a;
  --c-border: #e8e6e1;
  --c-border-strong: #d6d3cc;

  --c-accent: #2a6acc;
  --c-accent-dark: #1f4d99;
  --c-accent-light: #e3f0ff;
  --c-accent-glow: rgba(42, 106, 204, 0.18);
  --c-accent-2: #0aa3a3;
  --c-accent-2-light: #e0f7f7;
  --c-good: #2a8a2a;
  --c-good-bg: #e8f5e9;
  --c-warn-bg: #fff8e1;
  --c-err: #c0392b;
  --c-err-bg: #fde8e8;

  --max-width: 1040px;
  --gutter: 1.25rem;

  --radius-sm: 4px;
  --radius: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 14px rgba(20, 20, 30, 0.06);
  --shadow-lg: 0 12px 30px rgba(20, 30, 60, 0.10);
  --shadow-accent: 0 10px 28px rgba(42, 106, 204, 0.18);

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", SFMono-Regular, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #0e1117;
    --c-bg-elev: #131a23;
    --c-surface: #161d27;
    --c-surface-2: #1c2532;
    --c-text: #e7ecf2;
    --c-text-2: #cfd6df;
    --c-muted: #8995a4;
    --c-muted-2: #6c7787;
    --c-border: #232c39;
    --c-border-strong: #2c3744;

    --c-accent: #4d8cf0;
    --c-accent-dark: #3a72d0;
    --c-accent-light: #1b2b48;
    --c-accent-glow: rgba(77, 140, 240, 0.30);
    --c-accent-2: #2dd4cf;
    --c-accent-2-light: #0e2a2a;
    --c-good: #5fc76e;
    --c-good-bg: #102816;
    --c-warn-bg: #2a210d;
    --c-err: #f06a6a;
    --c-err-bg: #2a1212;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.55);
    --shadow-accent: 0 10px 28px rgba(77, 140, 240, 0.25);
  }
}

/* ── Base ───────────────────────────────────── */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--c-text);
  margin: 0;
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
  font-size: 16px;
}
body::before {
  /* subtle grid texture, very faint */
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1200px 600px at 80% -10%, var(--c-accent-glow), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(10, 163, 163, 0.08), transparent 60%);
  z-index: -1;
}
@media (prefers-color-scheme: dark) {
  body::before {
    background-image:
      radial-gradient(1200px 600px at 80% -10%, rgba(77, 140, 240, 0.18), transparent 60%),
      radial-gradient(900px 500px at -10% 110%, rgba(45, 212, 207, 0.10), transparent 60%);
  }
}

a { color: var(--c-accent); text-decoration: none; transition: color 0.15s var(--ease); }
a:hover { text-decoration: underline; }

h1, h2, h3 { letter-spacing: -0.01em; line-height: 1.25; }
h1 { font-weight: 800; }
h2 { font-weight: 700; }
h3 { font-weight: 600; }

code {
  background: var(--c-surface-2);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: var(--font-mono);
  color: var(--c-text-2);
}

::selection {
  background: var(--c-accent);
  color: #fff;
}

/* keyboard focus */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.6rem 1rem;
  background: var(--c-accent);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 200;
  font-weight: 600;
}
.skip-link:focus {
  left: 0;
  text-decoration: none;
}

/* ── Header / Nav ──────────────────────────── */
.site-header {
  position: sticky; top: 0;
  background: color-mix(in srgb, var(--c-bg-elev) 85%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
  z-index: 100;
}
.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.nav .logo {
  display: inline-flex;
  align-items: center;
  color: var(--c-text);
  line-height: 0;
  border-radius: var(--radius-sm);
}
.nav .logo img {
  height: 32px;
  width: auto;
  display: block;
}
.nav ul {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  margin: 0; padding: 0;
  font-size: 0.93rem;
}
.nav ul a {
  color: var(--c-text-2);
  font-weight: 500;
  padding: 0.25rem 0;
  position: relative;
  transition: color 0.15s var(--ease);
}
.nav ul a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-2));
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease);
}
.nav ul a:hover { color: var(--c-accent); text-decoration: none; }
.nav ul a:hover::after { transform: scaleX(1); }
.nav ul a.active { color: var(--c-accent); }
.nav ul a.active::after { transform: scaleX(1); }
@media (max-width: 700px) {
  .nav ul { gap: 0.8rem; font-size: 0.85rem; flex-wrap: wrap; justify-content: flex-end; }
  .nav .logo img { height: 26px; }
}

/* ── Sections common ─────────────────────────── */
section, .page-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem var(--gutter) 3rem;
}
section h2, .page-section h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.7rem);
  margin: 0 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--c-text);
}
section h2::after, .page-section h2::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--c-border) 0%, transparent 100%);
}
section .lead, .page-section .lead {
  color: var(--c-muted);
  margin: 0 0 2rem;
  font-size: 0.97rem;
}

/* page header (about / skills / works / contact) */
.page-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3.5rem var(--gutter) 1.6rem;
  position: relative;
}
.page-header::before {
  content: '';
  position: absolute;
  inset: 0 calc(-50vw + 50%);
  background:
    linear-gradient(to bottom, rgba(0, 0, 0, 0) 60%, var(--c-bg) 100%),
    linear-gradient(135deg,
      rgba(42, 106, 204, 0.22) 0%,
      rgba(10, 163, 163, 0.18) 60%,
      transparent 100%);
  z-index: -1;
  pointer-events: none;
}
.page-header h1 {
  font-size: clamp(1.8rem, 3.6vw, 2.4rem);
  margin: 0 0 0.6rem;
  background: linear-gradient(135deg, var(--c-text) 0%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-header .lead {
  color: var(--c-muted);
  margin: 0;
  font-size: 1.02rem;
  max-width: 720px;
}

/* ── Hero ─────────────────────────────────────── */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5.5rem var(--gutter) 4rem;
  text-align: left;
  position: relative;
}
.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem 0.3rem 0.6rem;
  border: 1px solid var(--c-border-strong);
  background: var(--c-surface);
  color: var(--c-muted);
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: 999px;
  margin-bottom: 1.25rem;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-sm);
}
.hero-status .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-good);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-good) 25%, transparent);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-good) 25%, transparent); }
  50%      { box-shadow: 0 0 0 6px color-mix(in srgb, var(--c-good) 10%, transparent); }
}
.hero-monogram {
  width: 88px; height: 88px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 1.6rem;
  box-shadow: var(--shadow-accent), inset 0 -8px 18px rgba(0,0,0,0.18);
  position: relative;
}
.hero-monogram::after {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px dashed var(--c-border-strong);
  opacity: 0.7;
  animation: spin 18s linear infinite;
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 2.9rem);
  margin: 0 0 0.7rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .tagline {
  font-size: 1.06rem;
  color: var(--c-muted);
  margin: 0 0 2.2rem;
  max-width: 620px;
}
.hero-cta {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-dark) 100%);
  color: #fff;
  box-shadow: 0 6px 16px var(--c-accent-glow);
}
.btn-primary:hover {
  box-shadow: 0 10px 24px var(--c-accent-glow);
  color: #fff;
}
.btn-ghost {
  background: var(--c-surface);
  color: var(--c-text);
  border-color: var(--c-border-strong);
}
.btn-ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  box-shadow: var(--shadow);
}

/* ── Top page summary cards ──────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
}
.summary-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), transform 0.2s var(--ease);
  box-shadow: var(--shadow-sm);
}
.summary-card::before {
  /* gradient top accent line, revealed on hover */
  content: '';
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-2));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.35s var(--ease);
}
.summary-card:hover {
  border-color: var(--c-border-strong);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}
.summary-card:hover::before { transform: scaleX(1); }
a.summary-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  border-radius: var(--radius);
}
a.summary-card-link:hover { text-decoration: none; }
.summary-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--c-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s var(--ease);
}
a.summary-card-link:hover .summary-card h3 { color: var(--c-accent); }
.summary-card p {
  margin: 0 0 0.9rem;
  color: var(--c-muted);
  font-size: 0.93rem;
}
.summary-card .more {
  font-size: 0.88rem;
  color: var(--c-accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.2s var(--ease);
}
a.summary-card-link:hover .summary-card .more { gap: 0.55rem; }

/* ── About ────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.about-text p { margin: 0 0 1rem; }
.about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.fact {
  padding: 1rem 1.1rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.15s var(--ease);
  box-shadow: var(--shadow-sm);
}
.fact:hover {
  border-color: var(--c-border-strong);
  transform: translateY(-1px);
}
.fact strong {
  display: block;
  color: var(--c-accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
  font-weight: 700;
}
.fact span { font-size: 0.96rem; color: var(--c-text-2); }

/* ── Skills ───────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
}
.skill-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  transition: border-color 0.2s var(--ease), transform 0.15s var(--ease), box-shadow 0.25s var(--ease);
  box-shadow: var(--shadow-sm);
}
.skill-card:hover {
  border-color: var(--c-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.skill-card h3 {
  font-size: 1rem;
  margin: 0 0 0.8rem;
  color: var(--c-accent);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.skill-tag {
  background: var(--c-accent-light);
  color: var(--c-accent-dark);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.81rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.skill-tag:hover {
  background: var(--c-surface);
  border-color: var(--c-accent);
  color: var(--c-accent);
}
@media (prefers-color-scheme: dark) {
  .skill-tag { color: var(--c-text-2); }
}

/* ── Works ────────────────────────────────────── */
.works-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
.work-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), transform 0.2s var(--ease);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.work-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--c-accent), var(--c-accent-2));
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.35s var(--ease);
}
.work-card:hover {
  border-color: var(--c-border-strong);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.work-card:hover::before { transform: scaleY(1); }
.work-meta {
  font-size: 0.8rem;
  color: var(--c-muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}
.work-card h3 {
  font-size: 1.18rem;
  margin: 0 0 0.5rem;
  color: var(--c-text);
}
.work-card h3 a { color: var(--c-text); }
.work-card h3 a:hover { color: var(--c-accent); text-decoration: none; }
.work-summary { color: var(--c-text-2); margin: 0.4rem 0 0.9rem; font-size: 0.96rem; }
.work-card .skill-tags { margin-top: 0.7rem; }

.work-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius);
}
.work-card-link:hover { text-decoration: none; }
.work-card-link:hover .work-card {
  border-color: var(--c-border-strong);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.work-card-link:hover .work-card::before { transform: scaleY(1); }
.work-card-link:hover .work-card h3 { color: var(--c-accent); }
.work-card-link .work-card { cursor: pointer; }

/* ── Blog list (top page preview) ─────────────── */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}
.post-list li {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1.1rem;
  transition: border-color 0.2s var(--ease), transform 0.15s var(--ease);
}
.post-list li:hover { border-color: var(--c-border-strong); transform: translateX(2px); }
.post-list .post-date {
  font-size: 0.82rem;
  color: var(--c-muted);
  margin-right: 0.6rem;
  font-variant-numeric: tabular-nums;
}
.blog-empty {
  background: var(--c-surface);
  border: 1px dashed var(--c-border-strong);
  border-radius: var(--radius);
  padding: 1.8rem;
  color: var(--c-muted);
  text-align: center;
}

/* ── Contact / Form ──────────────────────────── */
form { display: grid; gap: 0.9rem; max-width: 580px; margin-top: 1rem; }
label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--c-text);
  display: block;
  margin-bottom: 0.3rem;
  letter-spacing: 0.02em;
}
input, textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--c-border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.96rem;
  background: var(--c-surface);
  color: var(--c-text);
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
input::placeholder, textarea::placeholder { color: var(--c-muted-2); }
input:focus, textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-glow);
}
textarea { min-height: 8rem; resize: vertical; }
.status {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
}
.status.ok  { background: var(--c-good-bg); color: var(--c-good); border: 1px solid color-mix(in srgb, var(--c-good) 35%, transparent); }
.status.err { background: var(--c-err-bg);  color: var(--c-err);  border: 1px solid color-mix(in srgb, var(--c-err) 35%, transparent); }

/* ── Footer ──────────────────────────────────── */
footer {
  max-width: var(--max-width);
  margin: 5rem auto 0;
  padding: 2.5rem var(--gutter) 2rem;
  border-top: 1px solid var(--c-border);
  color: var(--c-muted);
  font-size: 0.88rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
}
footer a { color: var(--c-muted); }
footer a:hover { color: var(--c-accent); }

/* ── Scroll-reveal animation ─────────────────── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  }
  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── /projects/ explanation pages ─────────────
   Used by /projects/*.html for project breakdown sections.
   All colors via design tokens → automatic dark mode. */
.h-section {
  padding: 1.6rem 1.8rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin: 1.4rem 0;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.h-section:hover {
  border-color: var(--c-border-strong);
  box-shadow: var(--shadow);
}
.h-section h2 {
  font-size: 1.2rem;
  margin: 0 0 0.7rem;
  color: var(--c-accent);
}
.h-section p { margin: 0.5rem 0; color: var(--c-text-2); }
.h-section ul, .h-section ol { padding-left: 1.4rem; margin: 0.5rem 0; color: var(--c-text-2); }
.h-section li { margin: 0.25rem 0; }
.h-section strong { color: var(--c-text); }
.h-section table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.8rem 0;
  font-size: 0.92rem;
}
.h-section th, .h-section td {
  border: 1px solid var(--c-border);
  padding: 0.55rem 0.75rem;
  text-align: left;
  vertical-align: top;
  color: var(--c-text);
}
.h-section th {
  background: var(--c-surface-2);
  color: var(--c-text);
  font-weight: 600;
}
.h-section code {
  background: var(--c-surface-2);
  color: var(--c-text-2);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.88em;
  font-family: var(--font-mono);
}
.h-section a {
  color: var(--c-accent);
}
.h-meta { color: var(--c-muted); font-size: 0.88rem; }
.h-cta { display: flex; gap: 0.8rem; flex-wrap: wrap; margin: 1rem 0 1.6rem; }
.diagram-wrap {
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0.6rem;
  margin: 1rem 0;
  overflow-x: auto;
}
.diagram-wrap .mxgraph { max-width: 100%; }
.h-callout {
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--c-accent);
  background: var(--c-accent-light);
  color: var(--c-text);
  border-radius: var(--radius-sm);
  margin: 0.8rem 0;
  font-size: 0.93rem;
}
.h-callout.warn {
  border-left-color: #ffb300;
  background: #fff8e1;
}
@media (prefers-color-scheme: dark) {
  .h-callout.warn { background: #2a210d; color: var(--c-text-2); }
}

/* ── Responsive: tablet & small laptop ──────────
   Slim down vertical paddings and large headers for narrower viewports.
   Card grids already stack via auto-fit minmax, so we only retune spacing. */
@media (max-width: 720px) {
  :root {
    --gutter: 1rem;
  }
  .hero {
    padding: 3.4rem var(--gutter) 2.6rem;
  }
  .hero-monogram {
    width: 72px; height: 72px;
    font-size: 1.9rem;
    margin-bottom: 1.2rem;
  }
  .hero-status {
    font-size: 0.74rem;
    margin-bottom: 1rem;
  }
  .hero .tagline {
    font-size: 0.98rem;
    margin-bottom: 1.6rem;
  }
  .hero-cta { gap: 0.55rem; }
  .btn {
    padding: 0.65rem 1.2rem;
    font-size: 0.92rem;
  }
  section, .page-section {
    padding: 2.6rem var(--gutter) 2rem;
  }
  .page-header {
    padding: 2.4rem var(--gutter) 1.2rem;
  }
  section h2, .page-section h2 {
    font-size: clamp(1.25rem, 4vw, 1.55rem);
  }
  .summary-grid, .skills-grid {
    gap: 1rem;
  }
  .summary-card {
    padding: 1.2rem 1.25rem;
  }
  .skill-card, .work-card {
    padding: 1.15rem 1.25rem;
  }
  .work-card h3 { font-size: 1.08rem; }
  .work-summary { font-size: 0.93rem; }
  .h-section {
    padding: 1.2rem 1.2rem;
    margin: 1.1rem 0;
  }
  .h-section h2 { font-size: 1.1rem; }
  .h-section table { font-size: 0.86rem; }
  /* Allow long tables / wide content to scroll horizontally instead of overflowing the page */
  .h-section { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .h-section pre { overflow-x: auto; font-size: 0.82rem; }
  footer {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 3rem;
    padding: 1.8rem var(--gutter) 1.6rem;
    gap: 0.5rem;
  }
}

/* ── Responsive: phone ──────────────────────── */
@media (max-width: 480px) {
  body { font-size: 15px; line-height: 1.65; }
  .nav { padding: 0.55rem var(--gutter); }
  .nav ul { gap: 0.55rem; font-size: 0.78rem; }
  .nav .logo img { height: 24px; }
  .hero {
    padding: 2.4rem var(--gutter) 1.8rem;
  }
  .hero h1 {
    font-size: clamp(1.55rem, 7.4vw, 2rem);
    line-height: 1.25;
  }
  .hero-monogram {
    width: 60px; height: 60px;
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
  .hero-cta .btn { justify-content: center; }
  .summary-grid, .skills-grid, .works-list {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
  .summary-card,
  .skill-card,
  .work-card {
    padding: 1rem 1.05rem;
  }
  .summary-card h3 { font-size: 1.02rem; }
  .work-card h3 { font-size: 1rem; line-height: 1.4; }
  .work-summary { font-size: 0.9rem; }
  .work-meta { font-size: 0.74rem; }
  .skill-tag {
    font-size: 0.78rem;
    padding: 0.22rem 0.6rem;
  }
  .page-header {
    padding: 1.8rem var(--gutter) 1rem;
  }
  .page-header h1 {
    font-size: clamp(1.5rem, 6.4vw, 1.9rem);
  }
  .page-header .lead { font-size: 0.95rem; }
  /* Section dividers — keep the H2 readable when accent-line follows it */
  section h2, .page-section h2 { gap: 0.45rem; }
  .h-section { padding: 1rem 1rem; }
  .h-section h2 { font-size: 1.05rem; }
  .h-section pre { font-size: 0.78rem; padding: 0.7rem 0.8rem; }
  .h-section table { font-size: 0.82rem; }
  .h-section th, .h-section td { padding: 0.45rem 0.55rem; }
  /* Form fields — ensure 16px+ to avoid iOS auto-zoom on focus */
  input, textarea { font-size: 16px; }
  /* Wrap monospace inline code to prevent overflow */
  code { word-break: break-word; }
}