/* ==========================================================================
   NSNTEK — Components (header · footer · buttons · cards · chips · forms)
   ========================================================================== */

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  --btn-bg: var(--blue-500);
  --btn-fg: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.85rem 1.5rem;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  line-height: 1;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur) var(--ease),
    background var(--dur) var(--ease), color var(--dur) var(--ease);
  white-space: nowrap;
}

.btn svg {
  width: 1.1em;
  height: 1.1em;
  transition: transform var(--dur) var(--ease);
}

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

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  --btn-bg: var(--blue-500);
  box-shadow: var(--shadow-blue);
}

.btn--primary:hover {
  --btn-bg: var(--blue-600);
}

.btn--primary:hover svg {
  transform: translateX(3px);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border-color: var(--gray-300);
}

.btn--ghost:hover {
  border-color: var(--ink);
  background: var(--ink);
  --btn-fg: #fff;
}

.btn--light {
  --btn-bg: rgba(255, 255, 255, 0.1);
  --btn-fg: #fff;
  border-color: rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(6px);
}

.btn--light:hover {
  --btn-bg: #fff;
  --btn-fg: var(--navy-900);
}

.btn--lg {
  padding: 1.05rem 1.9rem;
  font-size: var(--fs-body);
}

.btn--block {
  width: 100%;
}

/* Text link with arrow */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-weight: var(--fw-semibold);
  color: var(--blue-600);
}

.link-arrow svg {
  width: 1.05em;
  height: 1.05em;
  transition: transform var(--dur) var(--ease);
}

.link-arrow:hover svg {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Chips / Tags
   -------------------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.4rem 0.85rem;
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  color: var(--gray-600);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
}

.section--dark .chip {
  color: var(--gray-200);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.14);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    height var(--dur) var(--ease);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 항상 흰색 헤더 (고정) */
.site-header {
  color: var(--ink);
  background: var(--white);
  box-shadow: 0 1px 0 var(--gray-200);
}

/* 스크롤 시 높이만 살짝 축소 */
.site-header.is-solid {
  height: 64px;
  box-shadow: 0 2px 12px rgba(11, 15, 25, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: var(--fw-extra);
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: currentColor;
}

.brand__mark {
  width: 32px;
  height: 32px;
  flex: none;
}

.brand__sub {
  display: none;
}

/* Real logo image */
.brand__logo {
  height: 39px;          /* 기존 30px 대비 +30% */
  width: auto;
  display: block;
  transition: height var(--dur) var(--ease);
}

/* 스크롤로 헤더가 줄어들면 로고도 살짝 축소 */
.site-header.is-solid .brand__logo {
  height: 34px;
}

/* 다크 푸터 → 로고를 흰색으로 (헤더는 흰 배경이라 원래 색 유지) */
.site-footer .brand__logo {
  filter: brightness(0) invert(1);
}

.site-footer .brand__logo {
  height: 44px;
  margin-bottom: var(--space-2);
}

@media (max-width: 760px) {
  .brand__logo { height: 34px; }
  .site-header.is-solid .brand__logo { height: 30px; }
}

/* Primary nav */
.nav {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.75rem);
}

.nav__link {
  position: relative;
  padding: 0.5rem 0.25rem;
  font-size: var(--fs-body);   /* 16px */
  letter-spacing: 0.04em;      /* 자간 확대 */
  font-weight: var(--fw-semibold);
  color: currentColor;
  opacity: 0.92;
  transition: opacity var(--dur) var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  opacity: 1;
}

.nav__link:hover::after,
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Language toggle */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-full);
}

.lang-toggle__btn {
  padding: 0.3rem 0.7rem;
  font-size: var(--fs-caption);
  font-weight: var(--fw-bold);
  border-radius: var(--radius-full);
  color: currentColor;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.lang-toggle__btn.is-active {
  background: var(--blue-500);
  color: #fff;
}

/* Mobile menu button */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle__bars::before {
  transform: translateY(-7px);
}

.nav-toggle__bars::after {
  transform: translateY(5px);
}

body.nav-open .nav-toggle__bars {
  background: transparent;
}

body.nav-open .nav-toggle__bars::before {
  transform: translateY(0) rotate(45deg);
}

body.nav-open .nav-toggle__bars::after {
  transform: translateY(-2px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--navy-900);
  color: var(--gray-300);
  padding-block: clamp(3rem, 2rem + 4vw, 5rem) var(--space-5);
}

.footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__brand .brand {
  color: #fff;
  margin-bottom: var(--space-2);
}

.footer__tagline {
  font-size: var(--fs-sm);
  color: var(--gray-400);
  max-width: 32ch;
}

.footer__col h4 {
  font-size: var(--fs-caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-400);
  margin-bottom: var(--space-2);
}

.footer__col ul {
  display: grid;
  gap: 0.7rem;
}

.footer__col a {
  font-size: var(--fs-sm);
  color: var(--gray-300);
  transition: color var(--dur) var(--ease);
}

.footer__col a:hover {
  color: #fff;
}

.footer__contact {
  display: grid;
  gap: 0.5rem;
  font-size: var(--fs-sm);
  font-style: normal;
  color: var(--gray-300);
}

.footer__contact b {
  color: var(--gray-400);
  font-weight: var(--fw-semibold);
  margin-right: 0.4em;
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-4);
  font-size: var(--fs-caption);
  color: var(--gray-500);
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

/* Feature card (icon + text) */
.feature-card {
  padding: var(--space-4);
  height: 100%;
  text-align: center;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: transparent;
}

.feature-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: var(--space-3);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(26, 109, 255, 0.12), rgba(0, 194, 209, 0.12));
  color: var(--blue-600);
}

.feature-card__icon svg {
  width: 26px;
  height: 26px;
}

.feature-card h3 {
  font-size: var(--fs-h4);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--gray-700);
}

.field .req {
  color: var(--blue-500);
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 0.9rem 1rem;
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 9l6 6 6-6' stroke='%236b7785' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.9rem center;
  background-size: 18px;
  padding-right: 2.6rem;
  cursor: pointer;
}

.field input::placeholder,
.field textarea::placeholder {
  color: var(--gray-400);
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: 0 0 0 4px rgba(26, 109, 255, 0.14);
}

.field textarea {
  min-height: 150px;
  resize: vertical;
}

.form-note {
  font-size: var(--fs-caption);
  color: var(--gray-500);
}

/* Inline underlined link (form notes, legal text) */
.link-underline {
  color: var(--blue-600);
  font-weight: var(--fw-semibold);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--dur) var(--ease);
}

.link-underline:hover {
  color: var(--blue-700);
}

/* Footer legal link */
.footer__legal {
  color: var(--gray-400);
  transition: color var(--dur) var(--ease);
}

.footer__legal:hover {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}