/* Neural Networking Business — usability-focused editorial theme */

:root {
  --color-bg: #eef2ee;
  --color-bg-deep: #e2e8e2;
  --color-surface: #fafcf9;
  --color-ink: #1a221c;
  --color-muted: #556058;
  --color-accent: #2a4f3f;
  --color-accent-hover: #1f3d32;
  --color-accent-soft: #d5e3db;
  --color-line: #c5cfc7;
  --color-warn: #8a3b2a;
  --color-ok: #2a4f3f;
  --font-display: "Gowun Batang", "Noto Serif KR", serif;
  --font-body: "Noto Sans KR", sans-serif;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --radius: 2px;
  --shadow-soft: 0 12px 40px rgba(26, 34, 28, 0.08);
  --header-h: 4.25rem;
  --wrap: min(1120px, calc(100% - 2.5rem));
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(213, 227, 219, 0.7), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(226, 232, 226, 0.9), transparent 50%),
    linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-deep) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: var(--color-accent-hover);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 3.1rem); }
h2 { font-size: clamp(1.55rem, 2.6vw, 2.1rem); margin-top: 0; }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1rem; }

ul, ol { padding-left: 1.2rem; }

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

.main {
  min-height: 60vh;
}

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 var(--space-3);
}

.lead {
  font-size: 1.15rem;
  color: var(--color-muted);
  max-width: 38rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.65rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--color-accent);
  color: #f5faf7;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-4);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(250, 252, 249, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.site-logo__mark {
  width: 1.6rem;
  height: 1.6rem;
  background: var(--color-accent);
  border-radius: 3px;
  flex-shrink: 0;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 0.45rem 0.7rem;
  font-family: inherit;
  cursor: pointer;
}

.nav-toggle__icon {
  width: 1.1rem;
  height: 2px;
  background: var(--color-ink);
  position: relative;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-ink);
}

.nav-toggle__icon::before { top: -5px; }
.nav-toggle__icon::after { top: 5px; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    padding: 0.75rem 1.25rem 1.25rem;
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav__list {
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* Footer */
.site-footer {
  margin-top: var(--space-7);
  padding: var(--space-6) 0 var(--space-4);
  background: var(--color-ink);
  color: #d7ddd8;
}

.site-footer a { color: #e8efe9; }
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-5);
}

.site-footer__name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.site-footer__heading {
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9aa89e;
  margin-bottom: 0.75rem;
}

.site-footer__links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer__links li { margin-bottom: 0.4rem; }

.site-footer__base {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 0.85rem;
  color: #8f9b93;
}

@media (max-width: 760px) {
  .site-footer__grid { grid-template-columns: 1fr; gap: var(--space-4); }
}

/* Home hero — full-bleed composition */
.home-hero {
  position: relative;
  min-height: min(92vh, 760px);
  display: flex;
  align-items: flex-end;
  color: #f4f7f4;
  overflow: hidden;
}

.home-hero__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(15, 28, 22, 0.88) 0%, rgba(15, 28, 22, 0.45) 48%, rgba(15, 28, 22, 0.25) 100%),
    url("https://images.unsplash.com/photo-1522071820081-009f0129c71c?w=1600&h=1000&fit=crop") center/cover no-repeat;
  transform: scale(1.04);
  animation: hero-drift 18s var(--ease) infinite alternate;
}

@keyframes hero-drift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.08) translate3d(-1.5%, -1%, 0); }
}

.home-hero__content {
  position: relative;
  z-index: 1;
  padding: var(--space-7) 0 var(--space-6);
  max-width: 36rem;
  animation: rise-in 0.9s var(--ease) both;
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(1.25rem); }
  to { opacity: 1; transform: translateY(0); }
}

.home-hero__brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  line-height: 1.1;
  margin: 0 0 var(--space-3);
  color: #fff;
}

.home-hero__text {
  font-size: 1.1rem;
  color: #dce6df;
  margin-bottom: var(--space-4);
}

.home-hero .btn--primary {
  background: #eef3ef;
  color: var(--color-accent-hover);
}

.home-hero .btn--primary:hover {
  background: #fff;
  color: var(--color-ink);
}

.home-hero .btn--ghost {
  border-color: rgba(255,255,255,0.45);
  color: #fff;
}

.home-hero .btn--ghost:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255,255,255,0.08);
}

/* Sections */
.section {
  padding: var(--space-6) 0;
}

.section--tight {
  padding: var(--space-5) 0;
}

.section__head {
  max-width: 38rem;
  margin-bottom: var(--space-5);
}

.section__head p {
  color: var(--color-muted);
}

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-5);
  align-items: center;
}

.split__media {
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.split__media img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}

.split:hover .split__media img {
  transform: scale(1.03);
}

@media (max-width: 800px) {
  .split { grid-template-columns: 1fr; }
}

.offer-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.offer-item {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-line);
  text-decoration: none;
  color: inherit;
  transition: background 0.2s var(--ease), padding-left 0.25s var(--ease);
}

.offer-item:hover {
  background: rgba(255,255,255,0.45);
  padding-left: 0.5rem;
}

.offer-item__img {
  width: 120px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius);
}

.offer-item__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 0 0 0.35rem;
}

.offer-item__summary {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.offer-item__cta {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

@media (max-width: 700px) {
  .offer-item {
    grid-template-columns: 88px 1fr;
  }
  .offer-item__cta { display: none; }
  .offer-item__img { width: 88px; height: 68px; }
}

.evidence {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  padding: var(--space-5);
  border-radius: var(--radius);
}

.evidence blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.45;
}

.evidence__meta {
  margin-top: var(--space-3);
  color: var(--color-muted);
  font-size: 0.92rem;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.note-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.note-card__img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
}

.note-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 0.5rem;
}

.note-card__excerpt {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin: 0;
  flex: 1;
}

@media (max-width: 860px) {
  .note-grid { grid-template-columns: 1fr; }
}

.cta-band {
  margin: var(--space-5) 0 var(--space-6);
  padding: var(--space-5);
  background: linear-gradient(135deg, var(--color-accent) 0%, #3a6b56 100%);
  color: #eef5f0;
  border-radius: var(--radius);
}

.cta-band h2 { color: #fff; margin-bottom: 0.5rem; }
.cta-band p { color: #d5e4db; max-width: 34rem; }
.cta-band .btn--primary {
  background: #fff;
  color: var(--color-accent-hover);
}

/* Page heroes */
.page-hero {
  position: relative;
  margin-bottom: var(--space-5);
}

.page-hero--plain {
  padding: var(--space-6) 0 var(--space-4);
}

.page-hero--image {
  min-height: 340px;
  display: flex;
  align-items: flex-end;
  color: #fff;
  overflow: hidden;
}

.page-hero__media {
  position: absolute;
  inset: 0;
  background: var(--hero-image) center/cover no-repeat;
}

.page-hero__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(18,28,22,0.35), rgba(18,28,22,0.82));
}

.page-hero__inner {
  position: relative;
  z-index: 1;
  padding: var(--space-6) 0 var(--space-5);
  max-width: 40rem;
}

.page-hero__title { color: #fff; margin: 0 0 0.75rem; }
.page-hero__lead { color: #d9e4dc; margin: 0; max-width: 34rem; }
.page-hero--image .eyebrow { color: #b8d0c4; }

.page-body {
  padding-bottom: var(--space-6);
}

.prose h2 { margin-top: 2.25rem; }
.prose h3 { margin-top: 1.5rem; }

/* Service / blog listing */
.listing {
  display: grid;
  gap: var(--space-5);
}

.listing-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-4);
  align-items: start;
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-line);
}

.listing-item img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius);
}

.listing-item h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.listing-item h2 a {
  text-decoration: none;
  color: var(--color-ink);
}

.listing-item h2 a:hover { color: var(--color-accent); }

@media (max-width: 720px) {
  .listing-item { grid-template-columns: 1fr; }
}

.meta {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
}

.detail-cover {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: var(--space-4);
}

.checklist {
  list-style: none;
  padding: 0;
}

.checklist li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.55rem;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--color-accent);
  border-radius: 1px;
}

.process-steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.process-steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
}

.process-steps li::before {
  content: counter(step);
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--color-accent);
  line-height: 1;
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  background: var(--color-surface);
}

.price-table th,
.price-table td {
  text-align: left;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.price-table th {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  background: var(--color-bg-deep);
}

.review-list {
  display: grid;
  gap: var(--space-4);
}

.review-item {
  padding: var(--space-4);
  background: var(--color-surface);
  border-left: 3px solid var(--color-accent);
}

.review-item blockquote {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.review-item--long {
  border-left-width: 4px;
  background: linear-gradient(90deg, var(--color-accent-soft), var(--color-surface) 40%);
}

.story-block {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
}

.story-block h3 {
  margin-top: 0;
}

/* Forms */
.form {
  max-width: 36rem;
  display: grid;
  gap: var(--space-3);
}

.form__field {
  display: grid;
  gap: 0.35rem;
}

.form__field label {
  font-weight: 600;
  font-size: 0.92rem;
}

.form__field input,
.form__field select,
.form__field textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font: inherit;
  background: var(--color-surface);
  color: var(--color-ink);
}

.form__field textarea { min-height: 140px; resize: vertical; }

.form__field input:focus,
.form__field select:focus,
.form__field textarea:focus {
  outline: 2px solid var(--color-accent-soft);
  border-color: var(--color-accent);
}

.form__error {
  color: var(--color-warn);
  font-size: 0.85rem;
  min-height: 1.1em;
}

.form__status {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
}

.form__status--ok {
  background: var(--color-accent-soft);
  color: var(--color-ok);
}

.form__status--err {
  background: #f3e0db;
  color: var(--color-warn);
}

.contact-aside {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
}

.contact-aside h2 {
  font-size: 1.15rem;
  margin-top: 0;
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
  box-shadow: 0 -8px 30px rgba(26, 34, 28, 0.1);
  padding: 1rem 0;
}

.cookie-banner[hidden] { display: none !important; }

.cookie-banner__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.cookie-banner__text {
  margin: 0;
  flex: 1;
  min-width: 220px;
  font-size: 0.95rem;
}

.cookie-banner__actions {
  display: flex;
  gap: 0.5rem;
}

/* 404 */
.error-page {
  padding: var(--space-7) 0;
  text-align: center;
}

.error-page h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  margin-bottom: 0.5rem;
}

/* Motion helpers */
.reveal {
  opacity: 0;
  transform: translateY(1rem);
  animation: rise-in 0.7s var(--ease) forwards;
}

.reveal-delay-1 { animation-delay: 0.12s; }
.reveal-delay-2 { animation-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .home-hero__bg { transform: none; }
  .reveal { opacity: 1; transform: none; }
}