/* Dataevolve — modern minimalist theme */
:root {
  --bg: #ffffff;
  --bg-soft: #f4f7f6;
  --bg-mist: #e8f0ee;
  --ink: #1a2421;
  --ink-muted: #5a6b66;
  --accent: #0f766e;
  --accent-soft: #14b8a6;
  --accent-pale: #ccfbf1;
  --line: #d5e0dc;
  --danger: #b42318;
  --ok: #067647;
  --radius: 4px;
  --font-display: "Noto Serif KR", "Source Serif 4", Georgia, serif;
  --font-body: "Noto Sans KR", "IBM Plex Sans", sans-serif;
  --space: clamp(1rem, 2vw, 1.5rem);
  --max: 1120px;
  --header-h: 4.25rem;
  --shadow-soft: 0 12px 40px rgba(15, 118, 110, 0.08);
}

*,
*::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(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #0b5f58;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}

h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 0.6em; }
h2 { font-size: clamp(1.55rem, 3vw, 2.15rem); margin: 0 0 0.55em; }
h3 { font-size: 1.25rem; margin: 0 0 0.45em; }

p { margin: 0 0 1em; color: var(--ink-muted); }
p:last-child { margin-bottom: 0; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.85rem var(--space);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--ink);
}

.logo-mark {
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 5px;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-soft) 100%);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.2);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.15rem;
  align-items: center;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.nav-cta {
  display: inline-block;
  padding: 0.45rem 0.95rem;
  background: var(--accent);
  color: #fff !important;
  border-radius: var(--radius);
  transition: background 0.2s ease, transform 0.2s ease;
}

.nav-cta:hover {
  background: #0b5f58;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 0.4rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 0.75rem var(--space) 1.25rem;
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
}

/* Footer */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding: 3.5rem 0 2rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space);
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 0.35rem;
}

.footer-tag {
  margin: 0 0 2rem;
  font-size: 0.95rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.footer-cols h2 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 0.85rem;
}

.footer-cols ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-cols li { margin-bottom: 0.45rem; }

.footer-cols a {
  text-decoration: none;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

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

.footer-address {
  font-size: 0.88rem;
  line-height: 1.55;
}

.footer-copy {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
}

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

@media (max-width: 480px) {
  .footer-cols { grid-template-columns: 1fr; }
}

/* Layout helpers */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--space);
}

.section {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
}

.section-soft { background: var(--bg-soft); }

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.lede {
  font-size: 1.15rem;
  max-width: 38rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

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

.btn-primary:hover {
  background: #0b5f58;
  color: #fff;
  transform: translateY(-1px);
}

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

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

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Home hero — brand-forward, full-bleed image plane */
.hero-home {
  position: relative;
  min-height: min(92vh, 780px);
  display: grid;
  align-items: end;
  color: #fff;
  overflow: hidden;
}

.hero-home__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-home__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroDrift 28s ease-in-out infinite alternate;
}

.hero-home__shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(15, 30, 28, 0.35) 0%, rgba(10, 28, 26, 0.78) 55%, rgba(8, 22, 20, 0.92) 100%),
    linear-gradient(90deg, rgba(15, 118, 110, 0.25) 0%, transparent 55%);
  z-index: 1;
}

.hero-home__content {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
  padding: 5rem var(--space) 4rem;
  animation: riseIn 0.9s ease both;
}

.hero-home .brand-hero {
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0 0 0.5rem;
  color: #fff;
}

.hero-home h1 {
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.94);
  max-width: 28rem;
  margin-bottom: 0.75rem;
}

.hero-home .hero-support {
  color: rgba(240, 253, 250, 0.88);
  max-width: 26rem;
  font-size: 1.05rem;
}

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

.hero-home .btn-primary:hover {
  background: var(--accent-pale);
  color: #0b5f58;
}

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

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

@keyframes heroDrift {
  from { transform: scale(1.05) translate(0, 0); }
  to { transform: scale(1.12) translate(-1.5%, 1%); }
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: fadeSlide 0.7s ease both;
}

/* Proof strip */
.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--line);
}

.proof-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.85rem;
  color: var(--ink);
  font-weight: 700;
}

.proof-item span {
  font-size: 0.92rem;
  color: var(--ink-muted);
}

@media (max-width: 640px) {
  .proof-strip { grid-template-columns: 1fr; gap: 1.25rem; }
}

/* Benefit list — not cards */
.benefit-list {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.benefit-row {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.25rem;
  align-items: start;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.benefit-num {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--accent-soft);
  font-weight: 600;
}

/* Featured courses — interaction containers */
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.course-tile {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.course-tile:hover {
  box-shadow: var(--shadow-soft);
  border-color: var(--accent-soft);
}

.course-tile img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.course-tile__body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.course-tile h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.course-tile p {
  font-size: 0.95rem;
  margin: 0;
}

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

/* Quote block */
.quote-block {
  max-width: 40rem;
  margin: 0 auto;
  text-align: center;
}

.quote-block blockquote {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.65rem);
  line-height: 1.45;
  color: var(--ink);
  font-weight: 500;
}

.quote-block cite {
  font-style: normal;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

/* Page hero (inner pages) */
.page-hero {
  padding: clamp(3rem, 6vw, 4.5rem) 0 2.5rem;
  background:
    radial-gradient(ellipse 80% 60% at 100% 0%, var(--accent-pale) 0%, transparent 55%),
    var(--bg);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 { max-width: 18ch; }
.page-hero .lede { margin-top: 0.5rem; }

/* Pricing */
.tier-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
  align-items: stretch;
}

.tier {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  background: #fff;
  display: flex;
  flex-direction: column;
}

.tier.is-featured {
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
  background: linear-gradient(180deg, #f0fdfa 0%, #fff 40%);
}

.tier h3 { margin-bottom: 0.35rem; }

.tier-price {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--ink);
  margin: 0.75rem 0 0.35rem;
}

.tier-price span {
  font-size: 0.95rem;
  font-family: var(--font-body);
  color: var(--ink-muted);
  font-weight: 400;
}

.tier ul {
  margin: 1.25rem 0 1.5rem;
  padding: 0 0 0 1.1rem;
  color: var(--ink-muted);
  flex: 1;
}

.tier li { margin-bottom: 0.45rem; }

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

/* Reviews */
.review-stack {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.review {
  padding: 0 0 2rem;
  border-bottom: 1px solid var(--line);
}

.review .stars {
  color: var(--accent);
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.review h3 { font-size: 1.15rem; }
.review .attr {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-top: 0.75rem;
}

.case-study {
  margin-top: 3rem;
  padding: 2rem;
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
}

/* Blog */
.blog-list {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.blog-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1.5rem;
  text-decoration: none;
  color: inherit;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
  transition: opacity 0.2s ease;
}

.blog-item:hover { opacity: 0.88; }

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

.blog-item h2 {
  font-size: 1.35rem;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

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

@media (max-width: 640px) {
  .blog-item { grid-template-columns: 1fr; }
}

.article-body {
  max-width: 42rem;
  margin: 2.5rem auto;
  padding: 0 var(--space) 3rem;
}

.article-body h2 { margin-top: 2rem; }
.article-cover {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

/* Forms */
.form-panel {
  max-width: 34rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.4rem;
  color: var(--ink);
}

.form-group .hint {
  font-size: 0.85rem;
  color: var(--ink-muted);
  font-weight: 400;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  color: var(--ink);
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

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

.field-error {
  display: none;
  color: var(--danger);
  font-size: 0.88rem;
  margin-top: 0.35rem;
}

.form-group.is-invalid .field-error { display: block; }
.form-group.is-invalid input,
.form-group.is-invalid select,
.form-group.is-invalid textarea {
  border-color: var(--danger);
}

.form-status {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  display: none;
}

.form-status.is-success {
  display: block;
  background: #ecfdf3;
  color: var(--ok);
  border: 1px solid #abefc6;
}

.form-status.is-error {
  display: block;
  background: #fef3f2;
  color: var(--danger);
  border: 1px solid #fecdca;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

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

.contact-details h2 { font-size: 1.15rem; margin-top: 1.5rem; }
.contact-details p { font-size: 0.95rem; }

/* Legal */
.legal-body {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.5rem var(--space) 4rem;
}

.legal-body h2 {
  font-size: 1.35rem;
  margin-top: 2rem;
}

.legal-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1.25rem 0;
}

.legal-body th,
.legal-body td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.legal-body th {
  background: var(--bg-soft);
  color: var(--ink);
}

/* Modules / FAQ */
.module-list {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
}

.module-list li {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.module-list strong {
  display: block;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}

.faq details p {
  margin-top: 0.65rem;
}

/* 404 */
.page-404 {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem var(--space);
}

.page-404 .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 7rem);
  color: var(--accent-pale);
  line-height: 1;
  margin: 0;
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: #fff;
  border-top: 1px solid var(--line);
  box-shadow: 0 -8px 32px rgba(26, 36, 33, 0.08);
  padding: 1.15rem var(--space);
  transform: translateY(110%);
  transition: transform 0.35s ease;
}

.cookie-banner.is-visible {
  transform: translateY(0);
}

.cookie-banner__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.cookie-banner p {
  margin: 0;
  flex: 1 1 280px;
  font-size: 0.95rem;
}

.cookie-banner__actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.inline-error {
  background: #fef3f2;
  color: var(--danger);
  border: 1px solid #fecdca;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin: 0.75rem 0;
  font-size: 0.92rem;
}

/* Split feature */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.split img {
  border-radius: var(--radius);
  width: 100%;
  aspect-ratio: 5/4;
  object-fit: cover;
}

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

.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.25rem;
  align-items: center;
  margin: 2rem 0;
}

.instructor img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
}

.muted { color: var(--ink-muted); }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }

.script-error-slot:empty { display: none; }