/* ==========================================================================
   K-DEVCON — 소개 페이지
   브랜드 컬러/타이포는 K-DEVCON Brand Identity 가이드 기준
   ========================================================================== */

:root {
  /* Brand palette */
  --kd-black: #000000;
  --kd-red: #ef3a24;
  --kd-slate: #8497a0;
  --kd-cyan: #60cae6;
  --kd-mist: #a3bcc6;

  /* Derived */
  --ink: #14181a;
  --ink-2: #43525a;
  --ink-3: #7c8b93;
  --line: #e4e9ec;
  --bg: #ffffff;
  --bg-tint: #f6f8f9;
  --bg-dark: #101619;

  --shell: 1120px;
  --radius: 14px;
  --radius-lg: 22px;

  --font-ko: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Segoe UI", Roboto, "Malgun Gothic", sans-serif;
  --font-en: "Karla", var(--font-ko);
  --font-serif: "Iowan Old Style", "Apple Garamond", Garamond, "Times New Roman",
    "Nanum Myeongjo", serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ko);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: -0.01em;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p, ul, ol, blockquote, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
b { font-weight: 700; }
img, svg { max-width: 100%; }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--kd-red);
  color: #fff;
  padding: 12px 18px;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 3px solid var(--kd-red);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- logo ---------- */
.logo { display: inline-flex; }
.logo img {
  display: block;
  width: auto;
  height: 40px;
}
.logo--footer img { height: 36px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.94);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-2);
}
.site-nav a { position: relative; padding: 6px 0; transition: color 0.2s var(--ease); }
.site-nav a:hover { color: var(--kd-red); }

.site-nav a.is-active { color: var(--ink); }
.site-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--kd-red);
  border-radius: 2px;
}

/* `.site-nav a`(0,1,1)보다 우선순위가 높아야 padding이 먹는다 */
.site-nav a.site-nav__cta {
  display: inline-flex;
  align-items: center;
  background: var(--kd-red);
  color: #fff;
  padding: 9px 18px;
  border-radius: 999px;
  line-height: 1.2;
  transition: filter 0.2s var(--ease);
}
.site-nav a.site-nav__cta:hover { color: #fff; filter: brightness(1.08); }
.site-nav a.site-nav__cta.is-active::after { display: none; }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  padding: 0;
  place-items: center;
  gap: 5px;
}
.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 16px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    background 0.2s var(--ease), color 0.2s var(--ease);
}
.btn--primary {
  background: var(--kd-red);
  color: #fff;
  box-shadow: 0 10px 26px -12px rgba(239, 58, 36, 0.85);
}
.btn--ghost {
  background: rgba(255, 255, 255, 0.62);
  color: var(--ink);
  border: 1px solid rgba(20, 24, 26, 0.16);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.btn:hover { transform: translateY(-2px); }
.btn--ghost:hover { background: #fff; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(80px, 13vw, 150px) 0 clamp(72px, 11vw, 128px);
}

.hero__bg {
  position: absolute;
  inset: -20%;
  z-index: -2;
  background:
    radial-gradient(58% 52% at 10% 18%, rgba(96, 202, 230, 0.75) 0%, rgba(96, 202, 230, 0) 62%),
    radial-gradient(52% 48% at 78% 26%, rgba(239, 58, 36, 0.62) 0%, rgba(239, 58, 36, 0) 64%),
    radial-gradient(64% 58% at 30% 84%, rgba(239, 58, 36, 0.5) 0%, rgba(239, 58, 36, 0) 66%),
    radial-gradient(48% 44% at 88% 90%, rgba(163, 188, 198, 0.55) 0%, rgba(163, 188, 198, 0) 60%),
    linear-gradient(160deg, #f2fbfd 0%, #fdf2f0 55%, #f7fafb 100%);
  filter: saturate(112%);
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(20, 24, 26, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 24, 26, 0.055) 1px, transparent 1px);
  background-size: 148px 148px;
  mask-image: radial-gradient(70% 70% at 50% 45%, #000 25%, transparent 100%);
  -webkit-mask-image: radial-gradient(70% 70% at 50% 45%, #000 25%, transparent 100%);
}

.hero__inner { text-align: center; }

.hero__eyebrow {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: rgba(20, 24, 26, 0.45);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.hero__title {
  display: grid;
  gap: clamp(4px, 1vw, 10px);
  font-size: clamp(34px, 6.4vw, 68px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.035em;
}
.hero__title-em { color: var(--ink); }
.hero__title-em em { font-style: normal; }
.hero__title-brand {
  font-family: var(--font-en);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--kd-red);
  margin-top: clamp(6px, 1.4vw, 14px);
}

.hero__quote {
  margin-top: clamp(28px, 4.5vw, 44px);
  font-size: clamp(16px, 2.2vw, 21px);
  font-weight: 600;
  color: var(--ink-2);
}

.hero__actions {
  margin-top: clamp(30px, 4.5vw, 46px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ---------- section shell ---------- */
.section { padding: clamp(72px, 10vw, 128px) 0; }
.section--tint { background: var(--bg-tint); }

.section__head { margin-bottom: clamp(36px, 5vw, 60px); }
.section__kicker {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--kd-red);
  margin-bottom: 12px;
}
.section__title {
  font-size: clamp(30px, 4.6vw, 50px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.section__title.serif { font-family: var(--font-serif); }
.section__title em { font-style: normal; color: var(--kd-red); }
.section__sub {
  margin-top: 14px;
  font-size: clamp(15px, 1.8vw, 18px);
  color: var(--ink-3);
}

/* ---------- about ---------- */
.about {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  max-width: 860px;
}
.about__lead {
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: -0.025em;
}
.about__lead b {
  font-weight: 800;
  background: linear-gradient(transparent 62%, rgba(96, 202, 230, 0.45) 62%);
}
.about__body { color: var(--ink-2); font-size: clamp(16px, 1.9vw, 18px); }
.about__body b { color: var(--ink); }

/* ---------- story ---------- */
.story {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}
.story__block {
  display: grid;
  gap: 14px;
  padding-left: clamp(16px, 2.4vw, 26px);
  border-left: 3px solid var(--kd-red);
  max-width: 880px;
}
.story__h {
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.story__block p { color: var(--ink-2); }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}
.chips li {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-2);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  line-height: 1.4;
}

.pull-quote {
  margin-top: 8px;
  padding: clamp(20px, 3vw, 28px);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: clamp(16px, 1.9vw, 18px);
  color: var(--ink-2);
}
.pull-quote b { color: var(--ink); }

/* ---------- core value ---------- */
.values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
}
.value {
  position: relative;
  padding: clamp(26px, 3.4vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  overflow: hidden;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease),
    border-color 0.28s var(--ease);
}
.value::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--kd-red), var(--kd-cyan));
  opacity: 0;
  transition: opacity 0.28s var(--ease);
}
.value:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 24px 48px -30px rgba(20, 24, 26, 0.4);
}
.value:hover::after { opacity: 1; }

.value__no {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--kd-slate);
  margin-bottom: 16px;
}
.value__title {
  font-size: clamp(20px, 2.3vw, 24px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.35;
  margin-bottom: 12px;
}
.value__title span {
  display: block;
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 700;
  color: var(--kd-red);
  letter-spacing: 0;
  margin-top: 2px;
}
.value__desc { font-size: 15.5px; color: var(--ink-2); }

/* ---------- flywheel (dark) ---------- */
.section--dark {
  background: var(--bg-dark);
  color: #eef3f5;
}
.section--dark .section__title { color: #fff; }
.section--dark .section__sub { color: rgba(238, 243, 245, 0.6); }
.section--dark .section__kicker { color: var(--kd-cyan); }

.flywheel { display: grid; justify-items: center; gap: clamp(28px, 4vw, 44px); }

.flywheel__svg {
  width: 100%;
  max-width: 560px;
  height: auto;
  overflow: visible;
}

.fw-core {
  fill: var(--kd-red);
  filter: drop-shadow(0 18px 40px rgba(239, 58, 36, 0.55));
}
.fw-core-label {
  fill: #fff;
  font-size: 27px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.fw-inner {
  fill: #ffffff;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.fw-outer-label {
  fill: #ffffff;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.flywheel__caption {
  max-width: 720px;
  text-align: center;
  color: rgba(238, 243, 245, 0.72);
  font-size: clamp(15px, 1.8vw, 17px);
}
.flywheel__caption b { color: #fff; }

/* ---------- programs ---------- */
.programs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.2vw, 24px);
}
.program {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}
.program:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 48px -32px rgba(20, 24, 26, 0.45);
}
.program__status {
  justify-self: start;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-3);
  background: var(--bg-tint);
  border-radius: 999px;
  padding: 4px 12px;
  line-height: 1.6;
}
.program__status--live {
  color: #fff;
  background: var(--kd-red);
}
.program__title {
  margin-top: 6px;
  font-size: clamp(19px, 2.2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.025em;
}
.program__meta {
  font-family: var(--font-en);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--kd-slate);
}
.program__desc { margin-top: 4px; font-size: 15.5px; color: var(--ink-2); }

/* ---------- timeline ---------- */
.timeline {
  position: relative;
  display: grid;
  gap: 2px;
  max-width: 860px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 96px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}
.timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 0 30px;
  align-items: baseline;
  padding: 14px 0;
}
.timeline__item::before {
  content: "";
  position: absolute;
  left: 92px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--kd-slate);
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px #fff;
}
.timeline__date {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-3);
  letter-spacing: -0.01em;
}
.timeline__range { display: block; font-size: 12.5px; font-weight: 500; }
.timeline__text { font-size: 16.5px; font-weight: 600; letter-spacing: -0.02em; }
.timeline__text span {
  display: inline-block;
  font-weight: 500;
  font-size: 14.5px;
  color: var(--ink-3);
  margin-left: 2px;
}

.timeline__item--now .timeline__date { color: var(--kd-red); }
.timeline__item--now .timeline__text { color: var(--kd-red); font-weight: 800; }
.timeline__item--now .timeline__text span { color: var(--kd-red); opacity: 0.75; }
.timeline__item--now::before {
  background: var(--kd-red);
  width: 13px;
  height: 13px;
  left: 90px;
  top: 22px;
}

/* ---------- contact ---------- */
.section--contact {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(50% 60% at 8% 20%, rgba(96, 202, 230, 0.4) 0%, rgba(96, 202, 230, 0) 62%),
    radial-gradient(46% 52% at 92% 76%, rgba(239, 58, 36, 0.3) 0%, rgba(239, 58, 36, 0) 62%),
    linear-gradient(150deg, #f4fbfd, #fdf4f2);
}
.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: start;
}
.contact__lead {
  font-size: clamp(17px, 2.1vw, 20px);
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: -0.025em;
}
.contact__lead-en {
  margin-top: 14px;
  font-family: var(--font-en);
  font-size: 15px;
  color: var(--ink-3);
  line-height: 1.6;
}

.contact__links {
  margin-top: clamp(24px, 3vw, 32px);
  display: grid;
  gap: 10px;
}
.contact-link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(20, 24, 26, 0.08);
  border-radius: var(--radius);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.contact-link:hover {
  transform: translateX(4px);
  background: #fff;
  border-color: rgba(239, 58, 36, 0.35);
}
.contact-link__label {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--kd-red);
  min-width: 92px;
  flex: none;
}
.contact-link__value {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  word-break: break-all;
}
.contact-link[data-pending] {
  cursor: default;
  opacity: 0.62;
}
.contact-link[data-pending]:hover {
  transform: none;
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(20, 24, 26, 0.08);
}
.contact-link[data-pending] .contact-link__value { color: var(--ink-3); font-weight: 500; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--bg-dark);
  color: rgba(238, 243, 245, 0.72);
  padding: clamp(44px, 6vw, 68px) 0;
}
.site-footer__inner { display: grid; gap: 14px; justify-items: start; }

.site-footer__tag { font-size: 16px; font-weight: 600; color: #fff; letter-spacing: -0.02em; }
.site-footer__copy {
  margin-top: 6px;
  font-family: var(--font-en);
  font-size: 13px;
  color: rgba(238, 243, 245, 0.42);
}
.site-footer__copy a {
  color: rgba(238, 243, 245, 0.72);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}
.site-footer__copy a:hover { color: var(--kd-cyan); }

/* ---------- reveal (JS 없으면 그대로 보임) ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1024px) {
  .values,
  .programs { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav-toggle { display: grid; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -30px rgba(20, 24, 26, 0.6);
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 24px 22px;
  }
  .site-nav li { border-bottom: 1px solid var(--line); }
  .site-nav li:last-child { border-bottom: 0; padding-top: 14px; }
  .site-nav a { display: block; padding: 14px 0; font-size: 16px; }
  .site-nav a.is-active::after { display: none; }
  .site-nav__cta { text-align: center; }

  /* 모바일에서는 카드가 좁아져 읽기 어려우므로 1열로 */
  .values,
  .programs { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  /* 좁은 화면에서는 다이어그램이 작아지므로 글자만 살짝 키운다 */
  .fw-inner,
  .fw-outer-label { font-size: 17px; }
  .fw-core-label { font-size: 29px; }

  body { font-size: 16px; }
  html { scroll-padding-top: 76px; }
  .shell { padding-inline: 20px; }

  .hero__actions .btn { flex: 1 1 100%; }

  .timeline::before { left: 7px; }
  .timeline__item {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 12px 0 12px 30px;
  }
  .timeline__item::before { left: 3px; top: 20px; }
  .timeline__item--now::before { left: 1px; top: 18px; }
  .timeline__range { display: inline; margin-left: 4px; }

  .contact-link { flex-direction: column; gap: 4px; }
  .contact-link__label { min-width: 0; }
}

/* ---------- motion / print ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}

@media print {
  .site-header,
  .nav-toggle,
  .hero__actions { display: none; }
  .section--dark,
  .site-footer { background: #fff; color: #000; }
}