/* ===========================
   DT. 박윤우 Portfolio
   Editorial Luxury — v3
   =========================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* core palette */
  --primary:      #1a0608;
  --primary-mid:  #2e0c10;
  --accent:       #c0272d;
  --accent-soft:  rgba(192,39,45,0.1);
  --cream:        #f4efe9;
  --paper:        #ffffff;
  --text:         #1c1410;
  --muted:        #7d6e65;
  --border:       #e6ddd6;
  --border-dark:  rgba(255,255,255,0.08);

  /* typography */
  --font-display: 'Cormorant Garamond', 'Noto Serif KR', Georgia, serif;
  --font-ko:      'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
  --font-label:   'DM Sans', system-ui, sans-serif;

  /* layout */
  --nav-h:    68px;
  --max-w:    1100px;
  --radius:   4px;
  --radius-md:10px;

  /* shadows */
  --shadow-sm: 0 2px 12px rgba(26,6,8,0.07);
  --shadow:    0 8px 40px rgba(26,6,8,0.12);
  --shadow-lg: 0 20px 64px rgba(26,6,8,0.18);

  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-ko);
  color: var(--text);
  background: var(--paper);
  line-height: 1.7;
  overflow-x: hidden;
}

img    { display: block; max-width: 100%; height: auto; }
a      { text-decoration: none; color: inherit; }
ul     { list-style: none; }
button { font-family: inherit; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== NAVIGATION ===== */
#navbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}

#navbar.scrolled {
  background: var(--paper);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: rgba(255,255,255,0.95);
  letter-spacing: 0.02em;
  transition: color var(--transition);
  flex-shrink: 0;
}

.logo .logo-dt {
  font-style: italic;
  color: rgba(240,180,180,0.9);
}

#navbar.scrolled .logo           { color: var(--primary); }
#navbar.scrolled .logo .logo-dt  { color: var(--accent); font-style: italic; }

.nav-links {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.nav-links a {
  padding: 8px 13px;
  border-radius: var(--radius);
  font-family: var(--font-label);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.68);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: rgba(255,255,255,0.09);
}

#navbar.scrolled .nav-links a {
  color: var(--muted);
}

#navbar.scrolled .nav-links a:hover,
#navbar.scrolled .nav-links a.active {
  color: var(--primary);
  background: var(--cream);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 8px;
}

.lang-btn {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.22);
  background: transparent;
  color: rgba(255,255,255,0.72);
  font-family: var(--font-label);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all var(--transition);
}

.lang-btn:hover {
  background: rgba(255,255,255,0.09);
  border-color: rgba(255,255,255,0.4);
}

#navbar.scrolled .lang-btn {
  border-color: var(--border);
  color: var(--muted);
}

#navbar.scrolled .lang-btn:hover {
  background: var(--cream);
  color: var(--primary);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 4px;
  width: 36px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: rgba(255,255,255,0.85);
  border-radius: 2px;
  transition: all var(--transition);
}

#navbar.scrolled .hamburger span { background: var(--text); }

.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: radial-gradient(ellipse 85% 75% at 30% 55%, #2e0c11 0%, var(--primary) 68%);
  overflow: hidden;
}

/* giant ghost watermark */
.hero-watermark {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 2%;
  font-family: 'Noto Serif KR', serif;
  font-weight: 700;
  font-size: clamp(12rem, 30vw, 28rem);
  color: rgba(255,255,255,0.022);
  letter-spacing: -0.06em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

/* dot grid texture */
.hero-grain {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.038) 1px, transparent 0);
  background-size: 26px 26px;
  pointer-events: none;
}

/* left accent bar */
.hero::before {
  content: '';
  position: absolute;
  top: 12%;
  bottom: 12%;
  left: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--accent) 40%, var(--accent) 60%, transparent);
  opacity: 0.35;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: calc(var(--nav-h) + 48px) 0 88px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* institution eyebrow */
.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 0.9s 0.15s ease forwards;
}

.hero-eyebrow-line {
  display: block;
  width: 32px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.hero-eyebrow span:last-child {
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
}

/* name block */
.hero-names { margin-bottom: 44px; }

.hero-name-ko {
  font-family: 'Noto Serif KR', serif;
  font-size: clamp(4rem, 14vw, 11rem);
  font-weight: 700;
  color: #fff;
  line-height: 0.88;
  letter-spacing: -0.05em;
  opacity: 0;
  animation: fadeUp 1s 0.35s ease forwards;
}

.hero-name-en {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 300;
  font-style: italic;
  font-size: clamp(1.2rem, 3vw, 2.4rem);
  color: rgba(255,255,255,0.38);
  letter-spacing: 0.12em;
  margin-top: 16px;
  margin-left: 4px;
  opacity: 0;
  animation: fadeUp 1s 0.55s ease forwards;
}

/* animated divider */
.hero-divider {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin: 0 0 32px;
  width: 0;
  opacity: 0;
  animation: expandWidth 0.9s 0.75s ease forwards;
}

@keyframes expandWidth {
  from { width: 0; opacity: 1; }
  to   { width: 100%; opacity: 1; }
}

/* role + CTA row */
.hero-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.9s 0.95s ease forwards;
}

.hero-role {
  font-family: var(--font-label);
  font-size: 0.82rem;
  font-weight: 400;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius);
  background: #fff;
  color: var(--primary);
  font-family: var(--font-label);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: all var(--transition);
}

.btn-hero::after {
  content: '→';
  transition: transform var(--transition);
}

.btn-hero:hover {
  background: rgba(255,255,255,0.88);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.28);
}

.btn-hero:hover::after { transform: translateX(5px); }

/* scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator span {
  display: block;
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.28), transparent);
  animation: scrollPulse 2.5s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%   { opacity: 0; transform: scaleY(0); transform-origin: top; }
  40%  { opacity: 1; transform: scaleY(1); transform-origin: top; }
  85%  { opacity: 0; transform: scaleY(1); transform-origin: bottom; }
  100% { opacity: 0; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== CREDENTIALS MARQUEE ===== */
.marquee-strip {
  background: var(--primary-mid);
  overflow: hidden;
  padding: 14px 0;
  border-top: 1px solid rgba(192,39,45,0.18);
  border-bottom: 1px solid rgba(192,39,45,0.18);
}

.marquee-track {
  display: flex;
  align-items: center;
  white-space: nowrap;
  animation: marqueeScroll 32s linear infinite;
}

.marquee-track span {
  font-family: var(--font-label);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
  padding: 0 28px;
  flex-shrink: 0;
}

.marquee-track .marquee-dot {
  color: var(--accent);
  padding: 0 2px;
  font-size: 0.45rem;
  opacity: 0.7;
}

@keyframes marqueeScroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ===== SECTIONS ===== */
.section       { padding: 110px 0; }
.section-cream { background: var(--cream); }
.section-dark  { background: var(--primary); }

/* section labels */
.section-label {
  display: block;
  font-family: var(--font-label);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-label.center { text-align: center; }

.section-dark .section-label { color: rgba(240,170,170,0.6); }

/* section titles — Cormorant Garamond for that editorial serif feel */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.section-title.center { text-align: center; }
.section-dark .section-title { color: #fff; }

/* section subtitles */
.section-sub {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 60px;
  line-height: 1.75;
}

.section-sub.center    { text-align: center; }
.section-dark .section-sub { color: rgba(255,255,255,0.45); }

/* scroll reveal */
.reveal-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.72s ease, transform 0.72s ease;
}

.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger expertise cards */
.expertise-grid .exp-card:nth-child(2) { transition-delay: 0.08s; }
.expertise-grid .exp-card:nth-child(3) { transition-delay: 0.16s; }
.expertise-grid .exp-card:nth-child(4) { transition-delay: 0.24s; }
.expertise-grid .exp-card:nth-child(5) { transition-delay: 0.32s; }
.expertise-grid .exp-card:nth-child(6) { transition-delay: 0.40s; }

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 80px;
  align-items: center;
}

.about-body {
  font-size: 0.975rem;
  color: var(--muted);
  line-height: 1.9;
  margin-bottom: 18px;
}

.career-list {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.career-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.875rem;
  color: var(--text);
}

.career-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.about-img-wrap {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-img-wrap img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.about-img-wrap:hover img { transform: scale(1.04); }

.about-img-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 20px 22px;
  background: linear-gradient(to top, rgba(26,6,8,0.78), transparent);
  color: rgba(255,255,255,0.82);
  font-family: var(--font-label);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

/* ===== EXPERTISE ===== */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.exp-card {
  background: var(--paper);
  border-radius: var(--radius-md);
  padding: 36px 28px 30px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

/* red reveal bar on top */
.exp-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.exp-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: transparent;
}

.exp-card:hover::after { transform: scaleX(1); }

/* large faded background number */
.exp-num {
  position: absolute;
  top: 10px;
  right: 16px;
  font-family: var(--font-label);
  font-size: 4.5rem;
  font-weight: 700;
  color: rgba(192,39,45,0.065);
  line-height: 1;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.05em;
}

.exp-icon {
  width: 38px;
  height: 38px;
  color: var(--accent);
  margin-bottom: 18px;
}

.exp-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 10px;
  line-height: 1.25;
}

.exp-desc {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.78;
  margin-bottom: 16px;
}

.exp-en {
  font-family: var(--font-label);
  font-size: 0.65rem;
  color: rgba(192,39,45,0.55);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ===== SEMINAR (dark section) ===== */
.seminar-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 64px;
  align-items: start;
}

.seminar-poster {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 24px 72px rgba(0,0,0,0.55);
}

.seminar-poster img { width: 100%; display: block; }

.seminar-course-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.seminar-topics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-bottom: 30px;
}

.topic-group-full { grid-column: 1 / -1; }

.topic-group h4 {
  font-family: var(--font-label);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(192,39,45,0.7);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.topic-group ul li {
  font-size: 0.83rem;
  color: rgba(255,255,255,0.6);
  padding: 7px 0;
  border-bottom: 1px solid rgba(255,255,255,0.055);
  display: flex;
  align-items: center;
  gap: 10px;
}

.topic-group ul li::before {
  content: '';
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.65;
  flex-shrink: 0;
}

.seminar-info-box {
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  border: 1px solid rgba(255,255,255,0.09);
  margin-top: 4px;
}

.info-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.info-row:last-child { border-bottom: none; }

.info-label {
  font-family: var(--font-label);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
  min-width: 36px;
  flex-shrink: 0;
}

.info-value {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.78);
}

/* ===== GALLERY ===== */
.gallery-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 44px;
}

.filter-btn {
  padding: 8px 22px;
  border-radius: 2px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-label);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  background: var(--border);
  transition: all var(--transition);
  aspect-ratio: 4/3;
}

.gallery-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.gallery-item:hover img { transform: scale(1.07); }

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,6,8,0.78) 0%, transparent 55%);
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 18px;
}

.gallery-item:hover .gallery-overlay { opacity: 1; }

.gallery-caption-text {
  font-family: var(--font-label);
  font-size: 0.76rem;
  color: rgba(255,255,255,0.92);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 820px;
  margin: 0 auto;
}

.contact-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 40px 24px;
  text-align: center;
  transition: all var(--transition);
}

.contact-card:hover {
  background: rgba(255,255,255,0.07);
  transform: translateY(-4px);
}

.contact-icon {
  width: 44px; height: 44px;
  margin: 0 auto 20px;
  color: rgba(240,160,160,0.55);
}

.contact-card h3 {
  font-family: var(--font-label);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(240,160,160,0.45);
  margin-bottom: 14px;
}

.contact-card p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.footer {
  background: #0d0203;
  padding: 56px 0;
  text-align: center;
  border-top: 1px solid rgba(192,39,45,0.12);
}

.footer-name {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: rgba(255,255,255,0.82);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.footer-name span {
  font-style: italic;
  font-weight: 300;
  color: rgba(255,255,255,0.3);
  font-size: 0.85em;
  margin-left: 10px;
  letter-spacing: 0.08em;
}

.footer-sub {
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.22);
  margin-bottom: 20px;
}

.footer-copy {
  font-family: var(--font-label);
  font-size: 0.65rem;
  color: rgba(255,255,255,0.14);
  letter-spacing: 0.05em;
}

/* ===== LIGHTBOX ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: rgba(10,2,3,0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 24px;
}

.lightbox.active {
  opacity: 1;
  pointer-events: all;
}

.lb-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 90vw;
  max-height: 90vh;
}

#lbImg {
  max-width: 90vw;
  max-height: 82vh;
  border-radius: var(--radius);
  object-fit: contain;
  box-shadow: 0 28px 80px rgba(0,0,0,0.6);
}

.lb-caption {
  font-family: var(--font-label);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.4);
  text-align: center;
  max-width: 560px;
}

.lb-close, .lb-prev, .lb-next {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.72);
  cursor: pointer;
  border-radius: 50%;
  transition: all var(--transition);
  width: 44px; height: 44px;
  font-size: 1.2rem;
}

.lb-close:hover, .lb-prev:hover, .lb-next:hover {
  background: rgba(255,255,255,0.13);
  color: #fff;
}

.lb-close { top: 20px; right: 20px; font-size: 0.85rem; }
.lb-prev  { left: 20px;  top: 50%; transform: translateY(-50%); }
.lb-next  { right: 20px; top: 50%; transform: translateY(-50%); }

/* ===== RESPONSIVE ===== */
@media (max-width: 960px) {
  .nav-links  { display: none; }
  .hamburger  { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--primary);
    padding: 20px 24px 32px;
    gap: 4px;
    box-shadow: var(--shadow);
    z-index: 999;
  }

  .nav-links.open a {
    color: rgba(255,255,255,0.75);
    padding: 12px 14px;
    border-radius: var(--radius);
    font-size: 1rem;
  }

  .about-grid     { grid-template-columns: 1fr; gap: 52px; }
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
  .seminar-grid   { grid-template-columns: 1fr; }
  .seminar-poster { position: static; max-width: 420px; margin: 0 auto; }
  .contact-grid   { grid-template-columns: 1fr; max-width: 360px; }
}

@media (max-width: 640px) {
  .section { padding: 80px 0; }
  .container { padding: 0 20px; }

  .hero-bottom { flex-direction: column; align-items: flex-start; gap: 20px; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .seminar-topics { grid-template-columns: 1fr; }
  .topic-group-full { grid-column: auto; }

  .lb-prev { left: 8px; }
  .lb-next { right: 8px; }
}

@media (max-width: 420px) {
  .expertise-grid { grid-template-columns: 1fr; }
  .gallery-grid   { grid-template-columns: 1fr; }
}