/* ===== DTS Global 홈페이지 공통 스타일 ===== */

/* ===== 애플(apple.com) 스타일 색상 팔레트 ===== */
:root {
  --color-navy: #1d1d1f;        /* 애플 시그니처 잉크(거의 검정), 제목/글자용 */
  --color-navy-light: #3a3a3d;  /* 어두운 배경 그라데이션 보조색 */
  --color-blue: #0071e3;        /* 애플 블루, 버튼/링크 포인트 */
  --color-blue-light: #0077ed;  /* 애플 블루 호버 */
  --color-sky: #f2f7fd;
  --color-text: #1d1d1f;
  --color-text-light: #6e6e73;  /* 애플 보조 회색 */
  --color-border: #d2d2d7;      /* 애플 헤어라인 회색 */
  --color-white: #ffffff;
  --color-ground: #f5f5f7;      /* 애플 시그니처 연회색 섹션 배경 */
  --color-ink-dark: #a1a1a6;    /* 어두운(검정) 배경 위 보조 텍스트 */
  --max-width: 1120px;
  --radius: 18px;
  --shadow: 0 8px 24px rgba(15, 30, 60, 0.08);
}

/* Pretendard: 애플 SF Pro/SD Gothic Neo는 애플 자체 제품에만 쓸 수 있어 라이선스상
   웹사이트에 못 씁니다. 대신 같은 계열의 느낌을 내는 무료 오픈소스 폰트를 직접 파일로
   불러와, 방문자 기기와 상관없이 항상 이 폰트로 보이게 합니다. */
@font-face {
  font-family: "Pretendard";
  src: url("../assets/fonts/PretendardVariable.woff2") format("woff2-variations"),
       url("../assets/fonts/PretendardVariable.woff2") format("woff2");
  font-weight: 45 920;
  font-style: normal;
  font-display: swap;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Noto Sans KR", "Malgun Gothic", sans-serif;
  color: var(--color-text);
  background: var(--color-white);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.container-wide { max-width: 1320px; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
}

.logo {
  font-size: 21px;
  font-weight: 800;
  color: var(--color-navy);
  letter-spacing: -0.02em;
}

.logo span { color: var(--color-blue); }

.logo-link {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 64px;
  width: auto;
  display: block;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-navy);
  margin: 5px 0;
  transition: 0.2s;
}

.main-nav ul {
  display: flex;
  gap: 8px;
}

.main-nav a {
  display: block;
  padding: 10px 18px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  border-radius: 999px;
  border: 1px solid transparent;
  transition: 0.15s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-blue);
  background: var(--color-sky);
}

.main-nav a.lang-switch {
  border-color: var(--color-border);
  font-size: 14px;
  font-weight: 700;
  padding: 8px 14px;
  color: var(--color-text-light);
}
.main-nav a.lang-switch:hover {
  color: var(--color-blue);
  border-color: var(--color-blue);
  background: var(--color-white);
}

/* ===== Hero (상하 분할: 위 글자 / 아래 이미지) ===== */
.hero {
  color: var(--color-white);
}

.hero-split {
  display: flex;
  flex-direction: column;
}

.hero-split-text {
  display: flex;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 55%, #000 100%);
  padding: 76px 24px 60px;
}

.hero-copy { max-width: 720px; margin: 0 auto; }
.hero-actions { justify-content: center; }

.hero-split-image {
  position: relative;
  width: 100%;
  height: 440px;
  overflow: hidden;
  background: var(--color-navy);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, black 80%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 0%, black 80%, transparent 100%);
}
.hero-split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  animation: heroImageZoom 16s ease-in-out infinite alternate;
}
.hero-split-image video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 히어로 영상이 2개 이상일 때: 위아래로 겹쳐두고 opacity로만 전환 */
.hero-video {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
}
.hero-video.active { opacity: 1; z-index: 1; }

.hero-video-switch {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}
.hero-dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, 0.75);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.hero-dot:hover { background: rgba(255, 255, 255, 0.55); }
.hero-dot.active {
  background: rgba(255, 255, 255, 0.95);
  transform: scale(1.2);
}
@keyframes heroImageZoom {
  from { transform: scale(1); }
  to { transform: scale(1.12); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-split-image img { animation: none; }
}

@media (max-width: 900px) {
  .hero-split-text { padding: 56px 24px 44px; }
  .hero-split-image { height: 280px; }
}

.hero-eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-ink-dark);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin: 0 0 14px;
}

.hero-slogan {
  font-size: 20px;
  font-weight: 700;
  color: #c7c7cc;
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}

.hero p {
  font-size: 18px;
  color: var(--color-ink-dark);
  margin: 0 auto 32px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* page hero (내부 페이지 상단) */
.page-hero {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  color: var(--color-white);
  padding: 64px 0;
  text-align: center;
}

.page-hero .eyebrow {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-ink-dark);
  margin-bottom: 12px;
}

.page-hero h1 {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.03em;
}

.page-hero p {
  color: var(--color-ink-dark);
  font-size: 17px;
  max-width: 620px;
  margin: 0 auto;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 980px;
  font-weight: 600;
  font-size: 16px;
  transition: 0.15s;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-blue);
  color: var(--color-white);
}
.btn-primary:hover { background: var(--color-blue-light); }

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.1); }

.btn-outline-dark {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-border);
}
.btn-outline-dark:hover { background: var(--color-sky); }

/* ===== Sections ===== */
section { padding: 96px 0; }
section.tight { padding: 56px 0; }
.section-alt { background: var(--color-ground); }

.section-dark {
  background: var(--color-navy);
  color: var(--color-white);
}
.section-dark .section-eyebrow { color: var(--color-ink-dark); }
.section-dark .section-head h2 { color: var(--color-white); }
.section-dark .section-head p { color: var(--color-ink-dark); }
.section-dark .card {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.14);
}
.section-dark .card h3 { color: var(--color-white); }
.section-dark .card p { color: var(--color-ink-dark); }
.section-dark .card-icon { background: rgba(255, 255, 255, 0.08); }

.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 48px;
}

.section-eyebrow {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-blue);
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
  color: var(--color-navy);
}

.section-head p { color: var(--color-text-light); font-size: 17px; }

/* ===== Grids / Cards ===== */
.grid {
  display: grid;
  gap: 24px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 30px 26px;
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--color-sky);
  color: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 18px;
}

.card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-navy);
  margin: 0 0 10px;
}

.card p {
  font-size: 15.5px;
  color: var(--color-text-light);
  margin: 0;
}

.card-link {
  text-decoration: none;
  display: block;
  transition: 0.15s;
}
.card-link:hover {
  border-color: var(--color-blue);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.card-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--color-blue);
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-blue);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.feature-list li {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-white);
}
.feature-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-sky);
  color: var(--color-blue);
  font-weight: 800;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-list h3 { font-size: 17px; color: var(--color-navy); margin: 0 0 4px; }
.feature-list p { font-size: 15.5px; color: var(--color-text-light); margin: 0; }

@media (max-width: 860px) {
  .feature-list { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .feature-list { grid-template-columns: 1fr; }
}

/* stat strip */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat .num {
  font-size: 35px;
  font-weight: 800;
  color: var(--color-navy);
}
.stat .label {
  font-size: 17px;
  color: var(--color-text-light);
  margin-top: 4px;
}

/* about split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.split h2 {
  font-size: 33px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-navy);
  margin: 0 0 16px;
  letter-spacing: -0.03em;
}

.split p { color: var(--color-text-light); margin-bottom: 14px; }

.media-box {
  background: transparent;
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-blue);
  font-weight: 700;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, black 0%, black 72%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 0%, black 72%, transparent 100%);
}
.media-box img, .media-box video { width: 100%; height: 100%; object-fit: cover; }
.media-box img.media-box-fade { opacity: 0.7; }

/* ===== 배경 영상 위에 글자를 올리는 섹션 (회사소개 등) ===== */
.section-media-bg {
  position: relative;
  overflow: hidden;
  color: var(--color-white);
  background: var(--color-navy);
}
.section-media-bg > video.bg-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.section-media-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(0, 0, 0, 0.88) 0%, rgba(0, 0, 0, 0.68) 45%, rgba(0, 0, 0, 0.38) 100%);
  z-index: 1;
}
.section-media-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}
.section-media-content h2 { color: var(--color-white); }
.section-media-content p { color: #c7c7cc; }
.section-media-content .value-list li { color: #c7c7cc; }
.section-media-content .value-list li::before { background: var(--color-blue-light); }

/* value list */
.value-list li {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  color: var(--color-text-light);
}
.value-list li::before {
  content: "";
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-blue);
  margin-top: 8px;
}

/* timeline */
.timeline { border-left: 2px solid var(--color-border); margin-left: 8px; }
.timeline-item { position: relative; padding: 0 0 32px 28px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-blue);
  border: 3px solid var(--color-sky);
}
.timeline-item .year {
  font-weight: 800;
  color: var(--color-blue);
  font-size: 15px;
  margin-bottom: 4px;
}
.timeline-item p { margin: 0; color: var(--color-text-light); font-size: 16px; }

/* testimonial */
.testimonial-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
}
.testimonial-quote {
  font-size: 16px;
  color: var(--color-text);
  margin: 0 0 20px;
}
.testimonial-person {
  display: flex;
  align-items: center;
  gap: 12px;
}
.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-navy);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.testimonial-person .name { font-weight: 700; font-size: 15.5px; color: var(--color-navy); }
.testimonial-person .role { font-size: 14px; color: var(--color-text-light); }

/* portfolio case */
.case-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-white);
}
.case-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-blue);
  background: var(--color-sky);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.case-card .body { padding: 24px; }
.case-card h3 { font-size: 18px; color: var(--color-navy); margin: 0 0 8px; }
.case-card p { font-size: 15.5px; color: var(--color-text-light); margin: 0; }

/* CSR pillars */
.pillar {
  text-align: center;
  padding: 8px;
}
.pillar .card-icon { margin: 0 auto 18px; }

/* CSR 항목을 한 줄씩, 왼쪽 글자(4) : 오른쪽 이미지 프레임(6) 비율로 배치 */
.csr-rows { display: flex; flex-direction: column; }
.csr-row {
  display: grid;
  grid-template-columns: 4fr 6fr;
  gap: 24px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}
.csr-row:first-child { padding-top: 0; }
.csr-row:last-child { border-bottom: none; padding-bottom: 0; }
.csr-row-text .card-icon { margin-bottom: 16px; }
.csr-row-text h3 { font-size: 20px; font-weight: 700; color: var(--color-navy); margin: 0 0 8px; }
.csr-row-text p { font-size: 15.5px; color: var(--color-text-light); margin: 0; }
.csr-row-frame {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  background: transparent;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.csr-row-frame img { max-width: 42%; max-height: 50%; width: auto; height: auto; object-fit: contain; }
.csr-row-frame video { width: 100%; height: 100%; object-fit: cover; }

@media (max-width: 860px) {
  .csr-row { grid-template-columns: 1fr; }
  .csr-row-frame { order: -1; }
}

/* contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
}
.info-row {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}
.info-row:last-child { border-bottom: none; }
.info-row .k {
  width: 110px;
  flex-shrink: 0;
  font-weight: 700;
  color: var(--color-navy);
  font-size: 15.5px;
}
.info-row .v { color: var(--color-text-light); font-size: 15.5px; }

.map-box {
  background: #eef1f6;
  border-radius: var(--radius);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 15px;
  border: 1px solid var(--color-border);
  overflow: hidden;
}
.map-box iframe { width: 100%; height: 100%; min-height: 320px; border: 0; }

/* CTA band */
.cta-band {
  background: var(--color-blue);
  color: var(--color-white);
  text-align: center;
  padding: 64px 0;
}
.cta-band .btn-primary {
  background: var(--color-white);
  color: var(--color-blue);
}
.cta-band .btn-primary:hover { background: var(--color-sky); }
.cta-band h2 { font-size: 33px; font-weight: 800; letter-spacing: -0.03em; margin: 0 0 12px; }
.cta-band p { color: var(--color-ink-dark); margin: 0 0 28px; }

/* ===== FAQ (Support) ===== */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 6px 22px;
  margin-bottom: 12px;
  background: var(--color-white);
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 0;
  font-weight: 700;
  font-size: 17px;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 21px;
  font-weight: 400;
  color: var(--color-blue);
}
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p {
  margin: 0 0 18px;
  color: var(--color-text-light);
  font-size: 15.5px;
  line-height: 1.7;
}

/* ===== Footer ===== */
.site-footer {
  background: #000000;
  color: #a1a1a6;
  padding: 48px 0 28px;
  font-size: 15px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-logo { color: var(--color-white); font-weight: 800; font-size: 18px; margin-bottom: 12px; }
.footer-col h4 { color: var(--color-white); font-size: 15px; margin: 0 0 14px; }
.footer-col li { margin-bottom: 8px; }
.footer-col a:hover { color: var(--color-white); }
.footer-bottom {
  padding-top: 22px;
  font-size: 14px;
  color: #86868b;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}

/* 메뉴 항목(홈/회사소개/사업.../ENG 등 7개)이 한 줄에 다 들어가지 않는
   태블릿·작은 노트북 폭에서도 접이식 메뉴를 쓰도록 넉넉하게 잡음 */
@media (max-width: 1024px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: absolute;
    top: 88px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    display: none;
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; padding: 12px; gap: 4px; }
  .main-nav a { padding: 12px 16px; }
}

@media (max-width: 640px) {
  .hero h1, .page-hero h1 { font-size: 32px; }
  .section-head h2, .split h2 { font-size: 27px; }
  .hero { padding: 64px 0 56px; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  section { padding: 56px 0; }
}