/* Fonsacy — Signal Lab theme: cool slate mist + ink + signal coral */
:root {
  --ink: #15202b;
  --ink-soft: #3a4a5a;
  --mist: #e8eef3;
  --mist-deep: #d0dde8;
  --paper: #f4f7fa;
  --white: #ffffff;
  --signal: #e24a1a;
  --signal-deep: #b83610;
  --teal: #1a7a72;
  --line: rgba(21, 32, 43, 0.12);
  --shadow: 0 18px 40px rgba(21, 32, 43, 0.08);
  --radius: 4px;
  --font-display: "Black Han Sans", "Noto Sans KR", sans-serif;
  --font-body: "Noto Sans KR", sans-serif;
  --max: 1120px;
  --header-h: 72px;
  --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(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(26, 122, 114, 0.12), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(226, 74, 26, 0.1), transparent 55%),
    linear-gradient(180deg, var(--mist) 0%, var(--paper) 42%, var(--mist-deep) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

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

a {
  color: var(--teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--signal-deep);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
}

h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
}

h3 {
  font-size: 1.35rem;
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.2em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  background: var(--ink);
  color: var(--white);
  padding: 0.6rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  top: 1rem;
}

.inline-error {
  background: #fde8e2;
  color: #8a2208;
  padding: 0.75rem 1rem;
  text-align: center;
  border-bottom: 1px solid #f0b5a0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(244, 247, 250, 0.88);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--signal) 0%, var(--teal) 100%);
  clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
  animation: pulse-mark 4s var(--ease) infinite;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem 1.1rem;
}

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

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

.nav-cta {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  background: var(--ink);
  color: var(--white) !important;
  border-radius: var(--radius);
}

.nav-cta:hover {
  background: var(--signal);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: var(--radius);
  cursor: pointer;
  position: relative;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  margin: 0 auto;
  position: relative;
}

.nav-toggle-bar::before {
  position: absolute;
  top: -6px;
  left: 0;
}

.nav-toggle-bar::after {
  position: absolute;
  top: 6px;
  left: 0;
}

/* Layout */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section {
  padding: 4.5rem 0;
}

.section-tight {
  padding: 3rem 0;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.75rem;
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 40rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.4rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--signal);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--signal-deep);
  color: var(--white);
}

.btn-secondary {
  background: var(--ink);
  color: var(--white);
}

.btn-secondary:hover {
  background: #243447;
  color: var(--white);
}

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

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

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

/* Hero — full bleed */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: end;
  color: var(--white);
  overflow: hidden;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: hero-drift 18s var(--ease) infinite alternate;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(21, 32, 43, 0.88) 0%, rgba(21, 32, 43, 0.55) 48%, rgba(21, 32, 43, 0.25) 100%),
    linear-gradient(0deg, rgba(21, 32, 43, 0.65) 0%, transparent 45%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 4rem 1.25rem 3.5rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 6.5rem);
  line-height: 0.95;
  margin: 0 0 0.4em;
  animation: rise-in 0.9s var(--ease) both;
}

.hero h1 {
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  font-family: var(--font-body);
  font-weight: 700;
  max-width: 18em;
  margin-bottom: 0.7em;
  animation: rise-in 0.9s 0.12s var(--ease) both;
}

.hero .lede {
  color: rgba(255, 255, 255, 0.88);
  animation: rise-in 0.9s 0.22s var(--ease) both;
}

.hero .btn-row {
  animation: rise-in 0.9s 0.32s var(--ease) both;
}

.page-hero {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  max-width: 16em;
}

.page-hero-media {
  margin-top: 2rem;
  width: 100%;
  max-height: 360px;
  overflow: hidden;
}

.page-hero-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

/* Panels & grids */
.panel {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.stack > * + * {
  margin-top: 1rem;
}

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
}

.feature-num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--signal);
  line-height: 1;
}

/* Course tiles — not cardy chrome, image + text */
.course-tile {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.35s var(--ease);
}

.course-tile:hover {
  transform: translateY(-4px);
  color: inherit;
}

.course-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  margin-bottom: 1rem;
}

.course-tile h3 {
  margin-bottom: 0.35em;
}

.course-tile p {
  color: var(--ink-soft);
  margin: 0;
  font-size: 0.98rem;
}

.meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
}

/* Quotes / reviews */
.quote-block {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.quote-block:last-child {
  border-bottom: 1px solid var(--line);
}

.quote-block blockquote {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  quotes: none;
}

.quote-block cite {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.rating {
  color: var(--signal);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

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

.price-tier {
  padding: 1.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.price-tier.is-featured {
  border-color: var(--signal);
  background: linear-gradient(180deg, rgba(226, 74, 26, 0.08), rgba(255, 255, 255, 0.85));
}

.price-tier h3 {
  margin-bottom: 0.25em;
}

.price-amount {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin: 0.4em 0;
}

.price-note {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}

.price-tier ul {
  padding-left: 1.1em;
  margin-bottom: 1.5rem;
  color: var(--ink-soft);
}

.price-disclaimer {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* Forms */
.field {
  margin-bottom: 1.1rem;
}

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  background: var(--white);
  color: var(--ink);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--teal);
  outline-offset: 1px;
}

.field-error {
  color: #8a2208;
  font-size: 0.88rem;
  margin: 0.35rem 0 0;
}

.form-status {
  margin-top: 1rem;
  min-height: 1.4em;
}

.form-status.is-success {
  color: var(--teal);
  font-weight: 600;
}

.form-status.is-error {
  color: #8a2208;
  font-weight: 600;
}

.contact-aside address {
  font-style: normal;
  margin-bottom: 1rem;
}

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

.blog-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.5rem;
  align-items: start;
  text-decoration: none;
  color: inherit;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.blog-item:hover {
  color: inherit;
}

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

.article-body {
  max-width: 42rem;
}

.article-body h2 {
  margin-top: 2rem;
}

.article-cover {
  margin: 1.5rem 0 2rem;
}

.article-cover img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

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

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq details p {
  margin: 0.75rem 0 0;
  color: var(--ink-soft);
}

/* Modules */
.module-list {
  list-style: none;
  padding: 0;
  counter-reset: mod;
}

.module-list li {
  counter-increment: mod;
  padding: 1.25rem 0 1.25rem 3rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.module-list li::before {
  content: counter(mod, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.25rem;
  font-family: var(--font-display);
  color: var(--signal);
  font-size: 1.1rem;
}

/* Stats strip — not in hero */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat-row strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--ink);
}

.stat-row span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  margin-top: 4rem;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.82);
  padding: 3.5rem 0 2rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--white);
  margin: 0 0 0.5rem;
}

.footer-tag {
  max-width: 28rem;
  margin-bottom: 2rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.footer-heading {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 0.8rem;
}

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

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

.site-footer a {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
}

.site-footer a:hover {
  color: #ffb399;
}

.footer-address {
  font-style: normal;
  font-size: 0.9rem;
  line-height: 1.55;
}

.footer-copy {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.25rem;
  margin: 0;
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 200;
  max-width: 640px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  animation: rise-in 0.5s var(--ease) both;
}

.cookie-banner-inner {
  padding: 1.15rem 1.25rem;
}

.cookie-banner p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.cookie-actions {
  display: flex;
  gap: 0.6rem;
  justify-content: flex-end;
}

/* Legal prose */
.legal {
  max-width: 46rem;
}

.legal h2 {
  margin-top: 2rem;
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1rem 0 1.5rem;
}

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

.legal th {
  background: rgba(255, 255, 255, 0.7);
}

/* 404 */
.error-page {
  min-height: 60vh;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 3rem 1.25rem;
}

.error-page .code {
  font-family: var(--font-display);
  font-size: clamp(5rem, 18vw, 9rem);
  line-height: 1;
  color: var(--signal);
  margin: 0;
}

/* Animations */
@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-drift {
  from {
    transform: scale(1.05) translateY(0);
  }
  to {
    transform: scale(1.12) translateY(-2%);
  }
}

@keyframes pulse-mark {
  0%,
  100% {
    transform: rotate(0deg) scale(1);
  }
  50% {
    transform: rotate(8deg) scale(1.06);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3,
  .split,
  .price-grid,
  .footer-cols,
  .stat-row,
  .blog-item {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.25rem;
    display: none;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-cta {
    text-align: center;
  }

  .hero {
    min-height: 78vh;
  }
}