/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-surface-2: #1e1e1e;
  --color-border: #2a2a2a;
  --color-text: #f0f0f0;
  --color-text-secondary: #999;
  --color-accent: #c9a96e;
  --color-accent-light: #e0c98f;
  --font-sans: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); background: var(--color-bg); color: var(--color-text); line-height: 1.7; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== Navigation ===== */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(10,10,10,.85); backdrop-filter: blur(20px); border-bottom: 1px solid transparent; transition: border-color .3s; }
.nav.scrolled { border-bottom-color: var(--color-border); }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700; color: var(--color-accent); letter-spacing: 2px; }
.nav-links { list-style: none; display: flex; gap: 1.8rem; }
.nav-links a { font-size: .8rem; font-weight: 400; letter-spacing: 1px; text-transform: uppercase; color: var(--color-text-secondary); transition: color .3s; position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1px; background: var(--color-accent); transition: width .3s; }
.nav-links a:hover, .nav-links a.active { color: var(--color-accent); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-text); transition: transform .3s, opacity .3s; }

/* ===== Hero ===== */
.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(201,169,110,.08) 0%, transparent 60%), radial-gradient(ellipse at 70% 80%, rgba(201,169,110,.04) 0%, transparent 50%); }
.hero-content { position: relative; z-index: 1; max-width: 1200px; width: 100%; padding: 0 2rem; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.hero-image-wrap { display: flex; justify-content: center; }
.hero-image { width: 320px; height: 320px; object-fit: cover; border-radius: 20px; border: 2px solid var(--color-border); box-shadow: 0 20px 60px rgba(0,0,0,.5); }
.hero-motto { font-family: var(--font-serif); font-style: italic; font-size: 1.15rem; color: var(--color-accent); margin-bottom: .25rem; }
.hero-motto-kr { font-size: .95rem; color: var(--color-text-secondary); margin-bottom: 2rem; }
.hero-name { font-size: 4rem; font-weight: 900; letter-spacing: -1px; line-height: 1.1; margin-bottom: 1.5rem; }
.hero-tags { display: flex; gap: .75rem; flex-wrap: wrap; margin-bottom: 2rem; }
.tag { padding: .4rem 1rem; background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 100px; font-size: .85rem; color: var(--color-text-secondary); }
.hero-actions { display: flex; gap: 1rem; }
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .85rem 2rem; border-radius: 8px; font-size: .9rem; font-weight: 500; cursor: pointer; transition: all .3s; border: none; }
.btn-primary { background: var(--color-accent); color: var(--color-bg); }
.btn-primary:hover { background: var(--color-accent-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(201,169,110,.3); }
.btn-outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }
.scroll-indicator { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: .5rem; color: var(--color-text-secondary); font-size: .7rem; letter-spacing: 3px; text-transform: uppercase; }
.scroll-line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--color-accent), transparent); animation: scrollPulse 2s ease-in-out infinite; }
@keyframes scrollPulse { 0%,100% { opacity: .3; transform: scaleY(.5); } 50% { opacity: 1; transform: scaleY(1); } }

/* ===== Section System (strict light/dark alternation) ===== */
.section { padding: 6rem 0; }
.section-dark { background: var(--color-surface); }
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }
.section-title { font-family: var(--font-serif); font-size: 2.5rem; font-weight: 700; margin-bottom: 3rem; position: relative; display: inline-block; }
.section-title::after { content: ''; position: absolute; bottom: -8px; left: 0; width: 60px; height: 3px; background: var(--color-accent); }
.section-subtitle { color: var(--color-text-secondary); font-size: .95rem; margin-top: -2rem; margin-bottom: 2.5rem; }
.subsection-title { font-size: 1.2rem; margin-bottom: 1.5rem; color: var(--color-accent); letter-spacing: 1px; text-transform: uppercase; font-weight: 700; }
.text-muted { color: var(--color-text-secondary) !important; font-style: italic; }

/* ===== Profile ===== */
.profile-grid { display: grid; grid-template-columns: 280px 1fr; gap: 3rem; align-items: start; }
.profile-photo img { width: 100%; border-radius: 16px; border: 2px solid var(--color-border); }
.profile-item { display: flex; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--color-border); }
.profile-label { min-width: 60px; font-size: .8rem; font-weight: 700; text-transform: uppercase; color: var(--color-accent); letter-spacing: 1px; }
.profile-value { color: var(--color-text); font-size: .95rem; }
.profile-divider { height: 2rem; }
.profile-values h3 { font-size: 1rem; color: var(--color-text-secondary); margin-bottom: 1rem; }
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.value-card { text-align: center; padding: 1.25rem; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 12px; font-weight: 700; font-size: 1.1rem; transition: border-color .3s, transform .3s; }
.value-card:hover { border-color: var(--color-accent); transform: translateY(-4px); }

/* ===== Unified Accordion ===== */
/* Large: used in timeline, project cards, gallery cards */
.accordion { width: 100%; }
.accordion-toggle { display: flex; align-items: center; justify-content: space-between; width: 100%; background: none; border: none; color: inherit; cursor: pointer; text-align: left; padding: 0; gap: 1rem; font-family: inherit; }
.accordion-toggle h3 { font-size: inherit; margin: 0; }
.accordion-icon { font-size: 1.4rem; font-weight: 300; color: var(--color-accent); flex-shrink: 0; transition: transform .3s; width: 24px; text-align: center; }
.accordion.open .accordion-icon { transform: rotate(45deg); }
.accordion-body { max-height: 0; overflow: hidden; transition: max-height .4s ease, padding .3s ease; padding: 0; }
.accordion.open .accordion-body { max-height: 3000px; padding-top: 1rem; }
.accordion-body ul { list-style: none; padding: 0; }
.accordion-body ul li { position: relative; padding-left: 1.2rem; margin-bottom: .4rem; color: var(--color-text-secondary); font-size: .9rem; line-height: 1.6; }
.accordion-body ul li::before { content: '—'; position: absolute; left: 0; color: var(--color-accent); }
.accordion-body h4 { font-size: .9rem; color: var(--color-accent); margin: 1rem 0 .5rem; }
.accordion-body p { color: var(--color-text-secondary); font-size: .9rem; margin-bottom: .5rem; }
.accordion-body img { max-width: 100%; border-radius: 8px; border: 1px solid var(--color-border); margin-top: .75rem; }
.accordion-images { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: .75rem; margin-top: .75rem; }
.accordion-images img { margin-top: 0; width: 100%; object-fit: cover; }

/* Inline accordion: unified small style for certs, filmography */
.accordion-inline { margin-bottom: .15rem; }
.accordion-toggle-inline { display: flex; align-items: center; justify-content: space-between; width: 100%; background: none; border: none; color: var(--color-text-secondary); cursor: pointer; text-align: left; padding: .4rem 0 .4rem 1rem; font-size: .9rem; font-family: inherit; gap: .5rem; position: relative; transition: color .2s; }
.accordion-toggle-inline::before { content: '—'; position: absolute; left: 0; color: var(--color-border); }
.accordion-toggle-inline:hover { color: var(--color-accent); }
.acc-icon { font-size: 1rem; color: var(--color-accent); flex-shrink: 0; transition: transform .3s; opacity: .6; }
.accordion-inline.open .acc-icon { transform: rotate(45deg); opacity: 1; }
.accordion-inline .accordion-body { padding-left: 1rem; }
.accordion-inline.open .accordion-body { max-height: 2000px; padding-top: .5rem; padding-bottom: .5rem; }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 3rem; }
.timeline::before { content: ''; position: absolute; left: 7px; top: 0; bottom: 0; width: 1px; background: var(--color-border); }
.timeline-item { position: relative; padding-bottom: 3rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot { position: absolute; left: -3rem; top: 6px; width: 15px; height: 15px; border-radius: 50%; background: var(--color-surface); border: 2px solid var(--color-accent); z-index: 1; }
.timeline-item:hover .timeline-dot { background: var(--color-accent); box-shadow: 0 0 12px rgba(201,169,110,.4); }
.timeline-date { font-size: .8rem; color: var(--color-accent); font-weight: 700; letter-spacing: 1px; margin-bottom: .5rem; }
.timeline-content h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.timeline-content p { color: var(--color-text-secondary); font-size: .9rem; }

/* ===== Projects Grid (uniform cards) ===== */
.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.project-card { background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 16px; padding: 1.5rem; position: relative; overflow: hidden; transition: border-color .3s, transform .3s; }
.project-card:hover { border-color: var(--color-accent); transform: translateY(-4px); }
.project-card h3 { font-size: 1rem; margin-bottom: .5rem; }
.project-card p { color: var(--color-text-secondary); font-size: .85rem; }
.project-badge { position: absolute; top: 1rem; right: 1rem; font-size: .85rem; }

/* ===== Skills ===== */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-bottom: 3rem; }
.skill-category { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 16px; padding: 2rem; transition: border-color .3s, transform .3s; }
.skill-category:hover { border-color: var(--color-accent); transform: translateY(-4px); }
.skill-icon { font-size: 2rem; margin-bottom: 1rem; }
.skill-category h3 { font-size: 1.1rem; margin-bottom: 1rem; color: var(--color-accent); }
.skill-tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.skill-tag { padding: .3rem .75rem; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 6px; font-size: .8rem; color: var(--color-text-secondary); transition: all .2s; }
.skill-tag:hover { border-color: var(--color-accent); color: var(--color-accent); }
.skills-images { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.skills-img { width: 100%; border-radius: 12px; border: 1px solid var(--color-border); }

/* ===== Achievements ===== */
.award-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; margin-bottom: 3rem; }
.award-card { background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 14px; padding: 1.5rem; text-align: center; transition: border-color .3s, transform .3s; }
.award-card:hover { border-color: var(--color-accent); transform: translateY(-4px); }
.award-icon { font-size: 2rem; display: block; margin-bottom: .75rem; }
.award-card h3 { font-size: .95rem; margin-bottom: .5rem; }
.award-card p { font-size: .8rem; color: var(--color-text-secondary); margin-bottom: .5rem; }
.award-date { font-size: .75rem; color: var(--color-accent); font-weight: 700; letter-spacing: 1px; }
.achievement-detail { background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 14px; padding: 2rem; margin-bottom: 1.5rem; }
.aitop100-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 2rem; align-items: start; }
.aitop100-text h3 { font-size: 1.2rem; margin-bottom: .75rem; }
.aitop100-text p { color: var(--color-text-secondary); font-size: .95rem; margin-bottom: 1rem; font-style: italic; }
.aitop100-text ul { list-style: none; padding: 0; }
.aitop100-text ul li { position: relative; padding-left: 1.2rem; margin-bottom: .5rem; color: var(--color-text-secondary); font-size: .9rem; }
.aitop100-text ul li::before { content: '—'; position: absolute; left: 0; color: var(--color-accent); }
.aitop100-photos { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; }
.aitop100-photos img { width: 100%; border-radius: 10px; border: 1px solid var(--color-border); object-fit: cover; aspect-ratio: 4/3; }

/* ===== Press ===== */
.video-wrap { margin-bottom: 3rem; }
.video-wrap video { width: 100%; max-width: 800px; border-radius: 12px; border: 1px solid var(--color-border); display: block; margin: 0 auto; }
.video-caption { text-align: center; color: var(--color-text-secondary); font-size: .85rem; margin-top: .75rem; }
.press-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.press-card { background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 12px; overflow: hidden; transition: border-color .3s, transform .3s; }
.press-card:hover { border-color: var(--color-accent); transform: translateY(-4px); }
.press-card img { width: 100%; height: 200px; object-fit: cover; object-position: top; }
.press-info { padding: 1.25rem; }
.press-source { font-size: .75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--color-accent); font-weight: 700; display: block; margin-bottom: .5rem; }
.press-info p { font-size: .9rem; color: var(--color-text-secondary); line-height: 1.5; }

/* ===== Certifications ===== */
.cert-grid { display: flex; flex-direction: column; gap: 1rem; }
.cert-item { display: grid; grid-template-columns: 110px 1fr; gap: 2rem; padding: 1.25rem; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 12px; transition: border-color .3s; }
.cert-item:hover { border-color: var(--color-accent); }
.cert-year { font-family: var(--font-serif); font-size: 1.2rem; font-weight: 700; color: var(--color-accent); }
.cert-details { display: flex; flex-direction: column; }
.cert-plain { color: var(--color-text-secondary); font-size: .9rem; padding: .4rem 0 .4rem 1rem; position: relative; }
.cert-plain::before { content: '—'; position: absolute; left: 0; color: var(--color-border); }

/* ===== Filmography ===== */
.film-grid { display: flex; flex-direction: column; gap: 2rem; }
.film-item { display: grid; grid-template-columns: 80px 1fr; gap: 2rem; padding: 1.5rem; background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 12px; }
.film-year { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700; color: var(--color-accent); }
.film-details { display: flex; flex-direction: column; gap: .35rem; }
.film-entry { font-size: .9rem; color: var(--color-text-secondary); padding-left: 1rem; position: relative; }
.film-entry::before { content: '—'; position: absolute; left: 0; color: var(--color-border); }

/* ===== Gallery ===== */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.gallery-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 16px; padding: 1.5rem; transition: border-color .3s; }
.gallery-card:hover { border-color: var(--color-accent); }
.gallery-card .accordion-toggle h3 { font-size: 1rem; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; max-width: 600px; margin: 0 auto; }
.contact-card { display: flex; flex-direction: column; align-items: center; gap: .75rem; padding: 2.5rem; background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 16px; transition: all .3s; }
.contact-card:hover { border-color: var(--color-accent); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(201,169,110,.1); }
.contact-icon { font-size: 2rem; }
.contact-label { font-size: .75rem; text-transform: uppercase; letter-spacing: 2px; color: var(--color-text-secondary); }
.contact-value { font-size: 1rem; font-weight: 500; color: var(--color-accent); }

/* ===== Footer ===== */
.footer { text-align: center; padding: 2rem; border-top: 1px solid var(--color-border); color: var(--color-text-secondary); font-size: .8rem; }

/* ===== Fade In ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity .8s ease, transform .8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-grid { gap: 2rem; }
  .hero-name { font-size: 3rem; }
  .skills-grid, .projects-grid { grid-template-columns: 1fr 1fr; }
  .award-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(10,10,10,.98); backdrop-filter: blur(20px); padding: 2rem; gap: 1.5rem; border-bottom: 1px solid var(--color-border); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-image { width: 240px; height: 240px; }
  .hero-name { font-size: 2.5rem; }
  .hero-tags, .hero-actions { justify-content: center; }
  .section-title { font-size: 2rem; }
  .profile-grid { grid-template-columns: 1fr; }
  .profile-photo { max-width: 240px; margin: 0 auto; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .skills-grid, .projects-grid { grid-template-columns: 1fr; }
  .skills-images { grid-template-columns: 1fr; }
  .award-grid { grid-template-columns: 1fr 1fr; }
  .aitop100-grid { grid-template-columns: 1fr; }
  .aitop100-photos { grid-template-columns: 1fr 1fr; }
  .press-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .film-item { grid-template-columns: 60px 1fr; gap: 1rem; }
  .cert-item { grid-template-columns: 80px 1fr; gap: 1rem; }
  .accordion-images { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 2rem; }
  .hero-image { width: 180px; height: 180px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .award-grid { grid-template-columns: 1fr; }
}