/* ── GOOGLE FONTS ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;700&family=Noto+Sans+KR:wght@300;400;700&display=swap');

/* ── DESIGN TOKENS ── */
:root {
  --canvas:       #0a0a0a;
  --surface-soft: #111111;
  --surface-card: #161616;
  --hairline:     #222222;
  --body:         #a0a0a0;
  --body-strong:  #d0d0d0;
  --on-dark:      #ffffff;
  --muted:        #555555;
  --m-blue-light: #1c69d4;
  --m-blue-dark:  #0066b1;
  --m-red:        #e22718;
  --section: clamp(80px, 10vw, 140px);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 17px; }
body {
  background: var(--canvas);
  color: var(--on-dark);
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── UTILITY ── */
.section-inner { max-width: 1200px; margin: 0 auto; }

/* ── PROGRESS BAR ── */
#progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--m-blue-light), var(--m-blue-dark), var(--m-red));
  z-index: 200; transition: width .1s linear;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 48px; height: 64px;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
nav.scrolled { border-bottom-color: var(--hairline); }
.nav-logo { font-size: 16px; font-weight: 700; letter-spacing: .05em; }
.nav-links { display: flex; align-items: center; gap: 32px; justify-content: center; }
.nav-links a {
  font-size: 15px; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--muted);
  transition: color .2s;
}
.nav-links a:hover { color: var(--on-dark); }
.nav-email {
  font-size: 13px; color: var(--muted); letter-spacing: .5px;
  border: 1px solid var(--hairline); padding: 5px 14px;
  transition: border-color .2s, color .2s;
}
.nav-email:hover { border-color: var(--body); color: var(--on-dark); }
.lang-switch {
  display: flex; align-items: center; justify-content: flex-end; gap: 6px;
}
.lang-btn {
  background: none; border: none; cursor: pointer; font-family: inherit;
  font-size: 13px; font-weight: 700; letter-spacing: 1.5px;
  color: var(--muted); padding: 2px 0; transition: color .2s;
}
.lang-btn.active { color: var(--on-dark); }
.lang-btn:hover { color: var(--on-dark); }
.lang-sep { color: var(--hairline); font-size: 13px; user-select: none; }

/* ── HERO ── */
.hero {
  min-height: 100vh; padding-top: 64px;
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: 0;
  background: var(--canvas);
}
.hero-text {
  padding: clamp(48px, 8vw, 100px) 48px clamp(48px, 8vw, 100px) clamp(32px, 6vw, 80px);
}
.hero-badge {
  font-size: 13px; font-weight: 700; letter-spacing: 3px;
  color: var(--muted); text-transform: uppercase;
  margin-bottom: 24px;
  opacity: 0; animation: fadeUp .6s .1s forwards;
}
.hero-name {
  font-size: clamp(2.8rem, 5vw, 4.2rem); font-weight: 700;
  letter-spacing: .2em; line-height: 1; margin-bottom: 20px;
  opacity: 0; animation: fadeUp .6s .25s forwards;
}
.hero-title {
  font-size: clamp(1rem, 1.6vw, 1.2rem); font-weight: 300;
  color: var(--body-strong); letter-spacing: .03em; margin-bottom: 10px;
  opacity: 0; animation: fadeUp .6s .4s forwards;
}
.hero-edu {
  font-size: 1rem; color: var(--muted); margin-bottom: 36px;
  opacity: 0; animation: fadeUp .6s .5s forwards;
}
.hero-tags {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 44px;
  opacity: 0; animation: fadeUp .6s .6s forwards;
}
.hero-tag {
  font-size: 13px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--muted);
  border: 1px solid var(--hairline); padding: 6px 14px;
}
.hero-cta {
  display: inline-block; padding: 14px 36px;
  background: var(--on-dark); color: var(--canvas);
  font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  transition: background .2s, color .2s;
  opacity: 0; animation: fadeUp .6s .75s forwards;
}
.hero-cta:hover { background: var(--m-blue-light); color: var(--on-dark); }
.hero-actions {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  opacity: 0; animation: fadeUp .6s .75s forwards;
}
.hero-actions .hero-cta { opacity: 1; animation: none; }
.hero-email-link {
  font-size: 15px; color: var(--muted); letter-spacing: .3px;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 2px; transition: color .2s, border-color .2s;
}
.hero-email-link:hover { color: var(--on-dark); border-color: var(--body); }

.hero-photo-wrap {
  position: relative; height: 100vh; overflow: hidden;
  opacity: 0; animation: fadeIn .8s .3s forwards;
}
.hero-photo-wrap img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  filter: grayscale(8%);
  mix-blend-mode: luminosity;
}
.hero-photo-wrap::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to right, var(--canvas) 0%, transparent 25%),
              linear-gradient(to top, var(--canvas) 0%, transparent 30%);
}

/* ── KEYFRAMES ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: none; }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── SCROLL ANIMATION ── */
[data-anim] {
  opacity: 0; transform: translateY(24px);
  transition: opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1);
}
[data-anim].visible { opacity: 1; transform: none; }
[data-delay="1"] { transition-delay: .1s; }
[data-delay="2"] { transition-delay: .2s; }
[data-delay="3"] { transition-delay: .3s; }
[data-delay="4"] { transition-delay: .4s; }

/* ── M TRICOLOR STRIPE ── */
.m-stripe {
  height: 3px;
  background: linear-gradient(90deg, var(--m-blue-light) 0%, var(--m-blue-dark) 50%, var(--m-red) 100%);
  opacity: 0; transform: scaleX(0); transform-origin: left;
  transition: opacity .6s, transform .6s cubic-bezier(.16,1,.3,1);
}
.m-stripe.visible { opacity: 1; transform: scaleX(1); }

/* ── STATS BAND ── */
.stats-band {
  background: var(--surface-soft);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-cell { padding: 32px 36px; border-right: 1px solid var(--hairline); }
.stat-cell:last-child { border-right: none; }
.stat-value { font-size: 40px; font-weight: 700; line-height: 1; letter-spacing: -1px; }
.stat-value sup { font-size: 18px; font-weight: 300; vertical-align: super; letter-spacing: 0; }
.stat-label {
  font-size: 13px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--muted); margin-top: 8px;
}
.stat-sub { font-size: 13px; color: var(--m-blue-light); letter-spacing: .04em; margin-top: 4px; opacity: .85; }

/* ── SECTION COMMON ── */
.section-header { display: flex; align-items: baseline; gap: 18px; margin-bottom: 48px; }
.section-num { font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--muted); text-transform: uppercase; }
.section-title { font-size: 30px; font-weight: 700; text-transform: uppercase; letter-spacing: -.5px; }

/* ── ABOUT ── */
.section-about { background: var(--canvas); padding: var(--section) 48px; border-top: 1px solid var(--hairline); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.about-greeting {
  font-size: 32px; font-weight: 700; letter-spacing: -.5px;
  line-height: 1.25; text-transform: uppercase; margin-bottom: 32px;
}
.about-greeting em {
  font-style: normal; display: inline-block;
  background: linear-gradient(90deg, var(--m-blue-light), var(--m-blue-dark), var(--m-red));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.about-body { font-size: 17px; font-weight: 300; color: var(--body); line-height: 1.9; }
.about-body p + p { margin-top: 22px; }
.about-body strong { color: var(--body-strong); font-weight: 400; }
.about-right { padding-top: 8px; }
.about-quote {
  border-left: 3px solid var(--m-blue-light); padding-left: 20px;
  margin-bottom: 40px;
}
.about-quote p {
  font-size: 18px; font-weight: 300; font-style: italic;
  color: var(--body-strong); line-height: 1.75;
}
.about-keywords { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }
.keyword {
  font-size: 13px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--hairline); padding: 6px 12px;
}

/* ── ACHIEVEMENTS ── */
.section-achievements {
  background: var(--surface-soft);
  padding: var(--section) 48px;
  border-top: 1px solid var(--hairline);
}
.achievement-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--hairline);
}
.achievement-cell { background: var(--surface-card); padding: 36px; }
.achievement-number { font-size: 48px; font-weight: 700; letter-spacing: -2px; line-height: 1; margin-bottom: 8px; }
.achievement-unit { font-size: 22px; font-weight: 300; color: var(--body-strong); }
.achievement-desc { font-size: 16px; font-weight: 300; color: var(--body); line-height: 1.75; margin-bottom: 18px; }
.achievement-tag {
  font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--m-blue-light); border: 1px solid var(--m-blue-dark); padding: 4px 10px;
}

/* ── CAREER TIMELINE ── */
.section-career { background: var(--canvas); padding: var(--section) 48px; border-top: 1px solid var(--hairline); }
.timeline { position: relative; }
.timeline-track {
  position: absolute; left: 140px; top: 0; bottom: 0; width: 1px;
  background: var(--hairline);
}
.timeline-item {
  position: relative; display: grid;
  grid-template-columns: 140px 1fr;
  margin-bottom: 44px;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-left { padding-right: 32px; padding-top: 32px; text-align: right; }
.timeline-period { font-size: 13px; font-weight: 700; letter-spacing: .5px; color: var(--muted); line-height: 1.5; }
.timeline-duration { display: block; font-size: 12px; color: var(--m-blue-light); margin-top: 4px; font-weight: 400; }
.timeline-dot {
  position: absolute; right: -6px; top: 36px;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--canvas); border: 2px solid var(--muted); z-index: 2;
}
.timeline-item:first-child .timeline-dot {
  background: var(--on-dark); border-color: var(--on-dark);
  box-shadow: 0 0 0 4px rgba(255,255,255,.08);
}
.timeline-body {
  position: relative; margin-left: 28px; padding: 28px 32px;
  background: var(--surface-card); border: 1px solid var(--hairline);
}
.timeline-body::before {
  content: ''; position: absolute; left: -9px; top: 36px;
  border-right: 9px solid var(--hairline);
  border-top: 8px solid transparent; border-bottom: 8px solid transparent;
}
.timeline-body::after {
  content: ''; position: absolute; left: -8px; top: 36px;
  border-right: 9px solid var(--surface-card);
  border-top: 8px solid transparent; border-bottom: 8px solid transparent;
}
.tl-role { font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); margin-bottom: 5px; }
.tl-company { font-size: 17px; font-weight: 700; margin-bottom: 14px; }
.tl-desc { font-size: 16px; font-weight: 300; color: var(--body); line-height: 1.8; margin-bottom: 14px; }
.tl-badge {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; border: 1px solid var(--hairline); color: var(--muted);
  padding: 4px 10px; margin-right: 6px;
}

/* ── CAPABILITIES ── */
.section-capabilities { background: var(--surface-soft); padding: var(--section) 48px; border-top: 1px solid var(--hairline); }
.cap-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1px; background: var(--hairline); }
.cap-cell { background: var(--surface-card); padding: 32px; }
.cap-domain {
  font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: var(--m-blue-light); margin-bottom: 18px; padding-bottom: 14px;
  border-bottom: 1px solid var(--hairline);
}
.cap-items { list-style: none; }
.cap-items li {
  font-size: 16px; font-weight: 300; color: var(--body);
  padding: 7px 0; border-bottom: 1px solid var(--hairline); line-height: 1.5;
}
.cap-items li:last-child { border-bottom: none; }

/* ── FOOTER ── */
footer {
  background: var(--canvas); border-top: 1px solid var(--hairline);
  padding: 48px; text-align: center;
}
.footer-email { font-size: 17px; font-weight: 300; color: var(--body-strong); letter-spacing: .05em; margin-bottom: 12px; }
.footer-meta { font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); margin-bottom: 20px; }
.footer-domain { font-size: 13px; color: var(--muted); letter-spacing: 1px; }

/* ── CONTACT MODAL ── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0,0,0,.82); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  opacity: 0; pointer-events: none;
  transition: opacity .3s;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal-box {
  background: var(--surface-card); border: 1px solid var(--hairline);
  width: 100%; max-width: 580px; max-height: 92vh; overflow-y: auto;
  padding: 48px;
  transform: translateY(24px);
  transition: transform .35s cubic-bezier(.16,1,.3,1);
}
.modal-overlay.open .modal-box { transform: none; }

.modal-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 32px;
}
.modal-eyebrow {
  font-size: 12px; font-weight: 700; letter-spacing: 3px;
  text-transform: uppercase; color: var(--m-blue-light); margin-bottom: 6px;
}
.modal-heading { font-size: 24px; font-weight: 700; letter-spacing: -.5px; }
.modal-close {
  background: none; border: none; cursor: pointer;
  color: var(--muted); font-size: 20px; line-height: 1; padding: 4px;
  flex-shrink: 0; margin-top: 2px; transition: color .2s;
}
.modal-close:hover { color: var(--on-dark); }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field-group { margin-bottom: 20px; }
.field-label {
  display: block; font-size: 12px; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--muted); margin-bottom: 8px;
}
.req { color: var(--m-blue-light); }
.field-hint { font-weight: 300; text-transform: none; letter-spacing: 0; font-size: 12px; }
.field-input, .field-textarea {
  width: 100%; background: #111; border: 1px solid var(--hairline);
  color: var(--on-dark); font-family: inherit;
  font-size: 16px; font-weight: 300;
  padding: 13px 16px; outline: none; transition: border-color .2s;
}
.field-input:focus, .field-textarea:focus { border-color: var(--m-blue-light); }
.field-input::placeholder, .field-textarea::placeholder { color: var(--muted); opacity: .6; }
.field-textarea { resize: vertical; min-height: 130px; }

.file-wrap { display: flex; align-items: center; gap: 10px; }
.file-hidden { display: none; }
.file-btn {
  cursor: pointer; white-space: nowrap;
  font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--hairline);
  padding: 9px 16px; transition: border-color .2s, color .2s;
}
.file-btn:hover { border-color: var(--body); color: var(--on-dark); }
.file-name {
  font-size: 16px; font-weight: 300; color: var(--body);
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.file-clear {
  display: none; background: none; border: none; cursor: pointer;
  color: var(--muted); font-size: 16px; padding: 0; transition: color .2s;
}
.file-clear:hover { color: var(--on-dark); }

.form-error { font-size: 16px; color: var(--m-red); min-height: 20px; margin-bottom: 10px; }

.submit-btn {
  width: 100%; padding: 16px; border: none; cursor: pointer;
  background: var(--on-dark); color: var(--canvas);
  font-family: inherit; font-size: 14px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase;
  transition: background .2s, color .2s;
}
.submit-btn:hover:not(:disabled) { background: var(--m-blue-light); color: var(--on-dark); }
.submit-btn:disabled { opacity: .5; cursor: not-allowed; }

.form-success { display: none; text-align: center; padding: 16px 0; }
.success-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--m-blue-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; font-weight: 700; color: #fff;
  margin: 0 auto 20px;
}
.success-msg {
  font-size: 17px; font-weight: 300; color: var(--body);
  line-height: 1.8; margin-bottom: 28px;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-text { padding: 100px 32px 48px; }
  .hero-photo-wrap { height: 70vw; }
  .hero-photo-wrap::after { background: linear-gradient(to bottom, transparent 50%, var(--canvas) 100%); }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .achievement-grid { grid-template-columns: 1fr 1fr; }
  .cap-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-cell { border-right: none; border-bottom: 1px solid var(--hairline); }
  nav { padding: 0 24px; }
  .section-about, .section-achievements, .section-career,
  .section-capabilities { padding: var(--section) 24px; }
}
@media (max-width: 768px) {
  nav { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .lang-switch { justify-content: flex-end; }
}

@media (max-width: 600px) {
  .nav-links a:not(.nav-email) { display: none; }
  .achievement-grid { grid-template-columns: 1fr; }
  .cap-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .timeline-track { left: 96px; }
  .timeline-item { grid-template-columns: 96px 1fr; }
  .timeline-period { font-size: 12px; }
  .about-greeting { font-size: 26px; }
  footer { padding: 32px 24px; }
  .modal-box { padding: 32px 24px; }
  .field-row { grid-template-columns: 1fr; }
}