/* ── RESET ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}

/* ── TOKENS ── */
:root {
  --cream: #f5f0e8;
  --white: #fdfcf9;
  --ink: #1a1612;
  --ink-soft: #3d3530;
  --accent: #a32c04;
  --border: rgba(26, 22, 18, 0.12);
  --fd: "JetBrains Mono", Georgia, serif;
  --fb: "Noto Sans KR", "Malgun Gothic", sans-serif;
  --fm: "JetBrains Mono", "Courier New", monospace;
}

body {
  background: var(--cream);
  color: var(--ink);
  /* font-family: var(--fb); */
  overflow-x: hidden;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 3rem;
  background: rgba(245, 240, 232, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: padding 0.3s;
}
.logo {
  text-decoration: none;
  letter-spacing: -0.02em;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  a {
    padding: 0;
  }
  img {
    margin: 0;
  }
}

.nav-links {
  display: flex;
  gap: 2.2rem;
  list-style: none;
}
.nav-links a {
  font-family: var(--fd);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.3s;
}
.nav-links a:hover {
  color: var(--accent);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.6rem;
  font-family: var(--fb);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: 3px;
  transition: all 0.2s;
  cursor: pointer;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: transparent;
  color: var(--accent);
}
.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-outline:hover {
  background: var(--ink);
  color: var(--cream);
}

.contract-btn {
  padding: 0.55rem 1.15rem;
  font-size: 0.78rem;
}

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 8rem 3rem 4rem;
  position: relative;
  overflow: hidden;
}
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}
.hero-left {
  position: relative;
  z-index: 2;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  /* font-family: var(--fm); */
  font-size: 0.75rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.3rem 0.8rem;
  border-radius: 2px;
  margin-bottom: 1.8rem;
  animation: fadeUp 0.6s ease both;
}
h1 {
  font-family: var(--fd);
  font-weight: 800;
  font-size: clamp(2.6rem, 4.5vw, 4.4rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--ink);
  animation: fadeUp 0.6s 0.1s ease both;
}
h1 em {
  font-style: normal;
  color: var(--accent);
  position: relative;
}
h1 em::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  opacity: 0.25;
}
.hero-sub {
  margin-top: 1.6rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 460px;
  animation: fadeUp 0.6s 0.2s ease both;
}
.hero-cta {
  margin-top: 2.4rem;
  display: flex;
  gap: 1rem;
  animation: fadeUp 0.6s 0.3s ease both;
}

/* Hero diagram */
.hero-right {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeIn 0.8s 0.4s ease both;
}
.ai-diagram {
  width: 380px;
  height: 380px;
  position: relative;
}
.ai-orb {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(
    circle at 35% 35%,
    rgba(255, 255, 255, 0.6),
    var(--accent) 60%,
    #c03a10
  );
  box-shadow:
    0 0 50px rgba(232, 93, 47, 0.45),
    0 0 100px rgba(232, 93, 47, 0.18);
  animation: pulse 3s ease-in-out infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--fd);
  font-weight: 800;
  font-size: 0.95rem;
  color: #fff;
  letter-spacing: 0.06em;
}
.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  border: 1px dashed rgba(26, 22, 18, 0.18);
  transform-origin: center;
}
.orbit-1 {
  width: 190px;
  height: 190px;
  margin: -95px 0 0 -95px;
  animation: spin 8s linear infinite;
}
.orbit-2 {
  width: 280px;
  height: 280px;
  margin: -140px 0 0 -140px;
  animation: spin 14s linear infinite reverse;
}
.orbit-3 {
  width: 370px;
  height: 370px;
  margin: -185px 0 0 -185px;
  animation: spin 20s linear infinite;
}
.node {
  position: absolute;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}
.orbit-1 .node {
  top: -21px;
  left: calc(50% - 21px);
}
.orbit-2 .node:nth-child(1) {
  top: -21px;
  left: calc(50% - 21px);
}
.orbit-2 .node:nth-child(2) {
  bottom: -21px;
  left: calc(50% - 21px);
}
.orbit-3 .node:nth-child(1) {
  top: -21px;
  left: calc(50% - 21px);
}
.orbit-3 .node:nth-child(2) {
  top: calc(50% - 21px);
  right: -21px;
}
.orbit-3 .node:nth-child(3) {
  bottom: -21px;
  left: calc(50% - 21px);
}

/* ── SECTION COMMON ── */
section {
  padding: 7rem 3rem;
}
.section-label {
  /* font-family: var(--fm); */
  font-size: 0.73rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.7rem;
}
.section-title {
  font-family: var(--fd);
  font-weight: 800;
  font-size: clamp(1.9rem, 3.2vw, 2.8rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 1rem;
}
.section-desc {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 540px;
}

/* ── SERVICES ── */
#services {
  background: var(--white);
}
.services-header {
  margin-bottom: 3.5rem;
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5px;
  background: var(--border);
  border: 1.5px solid var(--border);
}
.service-card {
  background: var(--white);
  padding: 2.2rem;
  position: relative;
  overflow: hidden;
  transition: background 0.25s;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: var(--accent);
  transition: height 0.3s ease;
}
.service-card:hover {
  background: var(--cream);
}
.service-card:hover::before {
  height: 100%;
}
.service-icon {
  width: 50px;
  height: 50px;
  border-radius: 8px;
  background: var(--cream);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.3rem;
}
.service-card h3 {
  font-family: var(--fb);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.7rem;
  color: var(--ink);
}
.service-card p {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--ink-soft);
}
.service-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.1rem;
}
.tech-tag {
  /* font-family: var(--fm); */
  font-size: 0.68rem;
  padding: 0.22rem 0.55rem;
  background: var(--cream);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--ink-soft);
}

/* ── PORTFOLIO ── */
#portfolio {
  background: var(--cream);
}
.filter-wrap {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 2.5rem 0 2rem;
}
.filter-btn {
  /* font-family: var(--fm); */
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 0.45rem 1.1rem;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--ink-soft);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.4rem;
}
.p-card {
  border-radius: 5px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--border);
  transition:
    transform 0.25s,
    box-shadow 0.25s;
}
.p-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.1);
}
.p-card.hidden {
  display: none;
}
.p-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 800/520;
}
.p-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.p-card:hover .p-img-wrap img {
  transform: scale(1.05);
}
.p-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(26, 22, 18, 0.85) 0%,
    rgba(26, 22, 18, 0.25) 60%,
    transparent 100%
  );
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.3rem;
  opacity: 0;
  transition: opacity 0.3s;
}
.p-card:hover .p-overlay {
  opacity: 1;
}
.p-overlay-cat {
  /* font-family: var(--fm); */
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}
.p-overlay-title {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 0.25rem;
}
.p-overlay-tech {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.72);
}
.p-info {
  padding: 1.1rem 1.3rem;
}
.p-cat-badge {
  /* font-family: var(--fm); */
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.18rem 0.55rem;
  border-radius: 2px;
  margin-bottom: 0.55rem;
  display: inline-block;
}
.p-title {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  color: var(--ink);
}
.p-tech {
  font-size: 0.78rem;
  color: var(--ink-soft);
}

/* ── ABOUT ── */
#about {
  background: var(--white);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 5rem;
  margin-top: 4rem;
  align-items: start;
}
.stat-block {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.stat-num {
  font-family: var(--fd);
  font-weight: 800;
  font-size: 3.2rem;
  line-height: 1;
  color: var(--accent);
}
.stat-label {
  font-size: 0.83rem;
  color: var(--ink-soft);
  margin-top: 0.3rem;
}
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 1px;
  height: calc(100% - 16px);
  background: var(--border);
}
.tl-item {
  position: relative;
  margin-bottom: 2.4rem;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  margin-left: -4px;
}
.tl-year {
  font-family: var(--fm);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.35rem;
}
.tl-item h4 {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 0.98rem;
  margin-bottom: 0.45rem;
}
.tl-item p {
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ── PROFILE ── */
#profile {
  background: var(--ink);
  color: var(--cream);
  position: relative;
  overflow: hidden;
}
#profile::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 93, 47, 0.14) 0%, transparent 70%);
}
#profile .section-title {
  color: var(--cream);
}
.profile-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3.5rem;
  margin-top: 3rem;
  align-items: start;
}
.profile-avatar {
  img {
    border-radius: 20px;
  }
  /* height: 120px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent) 0%, #c03a10 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  flex-shrink: 0;
  border: 3px solid rgba(255, 255, 255, 0.1); */
}
.profile-name {
  font-family: var(--fd);
  font-weight: 800;
  font-size: 1.9rem;
  margin-bottom: 0.25rem;
}
.profile-title-text {
  /* font-family: var(--fm); */
  color: var(--accent);
  font-weight: bold;
  font-size: 1.2em;
  letter-spacing: 0.2rem;
  margin-bottom: 1.1rem;
}
.profile-bio {
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(245, 240, 232, 0.68);
  max-width: 580px;
  margin-bottom: 1.4rem;
}
.cert-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.4rem;

  a {
    padding: 1rem;
    background-color: white;
  }
}
.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.38rem 0.9rem;
  border: 1px solid rgba(245, 240, 232, 0.2);
  border-radius: 2px;
  font-size: 0.78rem;
  color: rgba(245, 240, 232, 0.65);
  font-family: var(--fm);
}

/* ── CONTACT ── */
#contact {
  background: var(--white);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  margin-top: 3rem;
}
.contact-info h3 {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 1.4rem;
  margin-bottom: 0.9rem;
}
.contact-info p {
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.contract-info-box {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.contract-info-item {
  font-size: 0.85rem;
  display: flex;
  gap: 0.55rem;
  align-items: center;
  color: var(--ink);
  span {
    color: var(--accent);
  }
}

.contact-detail {
  margin-top: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.contact-detail a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.2em;
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}
.contact-detail a:hover {
  color: var(--accent);
}

.contact-space-box {
  margin-top: 1.8rem;
  padding: 1.4rem;
  background: var(--cream);
  border-radius: 4px;
  border: 1px solid var(--border);
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
label {
  font-size: 0.8em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
input,
textarea,
select {
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-radius: 3px;
  padding: 0.72rem 0.95rem;
  font-family: var(--fb);
  font-size: 0.88rem;
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s;
  resize: vertical;
}
input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
}
textarea {
  min-height: 115px;
}

/* ── FOOTER ── */
footer {
  background: var(--ink);
  color: rgba(245, 240, 232, 0.5);
  padding: 2.4rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--fm);
  font-size: 0.73rem;
}
footer .logo {
  color: var(--cream);
}
footer a {
  color: rgba(245, 240, 232, 0.5);
  text-decoration: none;
}
footer a:hover {
  color: var(--accent);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@keyframes pulse {
  0%,
  100% {
    box-shadow:
      0 0 50px rgba(232, 93, 47, 0.4),
      0 0 100px rgba(232, 93, 47, 0.15);
  }
  50% {
    box-shadow:
      0 0 70px rgba(232, 93, 47, 0.6),
      0 0 140px rgba(232, 93, 47, 0.22);
  }
}

/* scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  nav {
    padding: 1rem 1.5rem;
  }
  .nav-links {
    display: none;
  }
  #hero {
    grid-template-columns: 1fr;
    padding: 7rem 1.5rem 3rem;
  }
  .hero-right {
    display: none;
  }
  section {
    padding: 5rem 1.5rem;
  }
  .about-grid,
  .contact-grid,
  .profile-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  footer {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}