:root {
  --bg-main: #071426;
  --bg-deep: #020712;
  --bg-card: rgba(7, 17, 33, 0.62);

  --line: rgba(130, 190, 255, 0.18);

  --text: #f7fbff;
  --muted: #b8c7de;

  --primary: #79d7ff;
  --secondary: #7c79ff;
  --accent: #64ffd2;

  --shadow:
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 0 30px rgba(73, 145, 255, 0.08);

  --radius: 24px;

  --container: 1480px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;

  font-family: "Poppins", sans-serif;

  color: var(--text);

  background:
    radial-gradient(
      circle at 15% 15%,
      rgba(44, 103, 184, 0.32),
      transparent 28%
    ),
    radial-gradient(
      circle at 85% 20%,
      rgba(75, 48, 170, 0.30),
      transparent 30%
    ),
    radial-gradient(
      circle at 50% 65%,
      rgba(18, 107, 139, 0.18),
      transparent 34%
    ),
    linear-gradient(
      180deg,
      #071426 0%,
      #061120 35%,
      #030a14 70%,
      #020711 100%
    );

  overflow-x: hidden;
}

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

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

.container {
  width: min(var(--container), calc(100% - 80px));
  margin: 0 auto;
}

.section {
  position: relative;
  z-index: 2;

  padding: 130px 0;
}

.section-head {
  margin-bottom: 42px;
}

.eyebrow {
  margin: 0 0 12px;

  font-size: 13px;
  font-weight: 600;

  letter-spacing: 0.26em;

  color: var(--primary);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h2 {
  margin-bottom: 0;

  font-size: clamp(34px, 4vw, 54px);

  line-height: 1.08;

  letter-spacing: -0.02em;
}

p {
  color: var(--muted);

  line-height: 1.8;
}



/* =========================================================
   우주 배경
========================================================= */

.space-background {
  position: fixed;

  inset: 0;

  overflow: hidden;

  z-index: 0;

  pointer-events: none;

  background:
    radial-gradient(
      ellipse at 25% 25%,
      rgba(45, 110, 185, 0.12),
      transparent 42%
    ),
    radial-gradient(
      ellipse at 80% 40%,
      rgba(101, 71, 190, 0.10),
      transparent 44%
    ),
    radial-gradient(
      ellipse at 55% 80%,
      rgba(43, 160, 177, 0.07),
      transparent 40%
    );
}

#starfield {
  position: absolute;

  inset: 0;
}


/* 기본 별 */

.star {
  position: absolute;

  border-radius: 50%;

  background: white;

  opacity: 0.75;

  box-shadow:
    0 0 5px rgba(255, 255, 255, 0.8),
    0 0 10px rgba(120, 195, 255, 0.45);

  animation: twinkle linear infinite;
}


@keyframes twinkle {

  0%,
  100% {
    opacity: 0.18;

    transform: scale(0.7);
  }

  50% {
    opacity: 1;

    transform: scale(1.4);
  }

}


/* 은하 성운 */

.nebula {
  position: absolute;

  border-radius: 50%;

  filter: blur(90px);

  opacity: 0.4;

  animation: nebulaFloat 18s ease-in-out infinite alternate;
}


.nebula-1 {

  width: 600px;
  height: 600px;

  top: -80px;
  left: -180px;

  background:
    radial-gradient(
      circle,
      rgba(55, 148, 255, 0.55),
      rgba(35, 89, 180, 0.15) 45%,
      transparent 72%
    );
}


.nebula-2 {

  width: 700px;
  height: 700px;

  top: 120px;
  right: -220px;

  background:
    radial-gradient(
      circle,
      rgba(104, 77, 255, 0.45),
      rgba(99, 48, 175, 0.16) 46%,
      transparent 72%
    );
}


.nebula-3 {

  width: 720px;
  height: 720px;

  bottom: -280px;
  left: 30%;

  background:
    radial-gradient(
      circle,
      rgba(56, 255, 217, 0.20),
      rgba(25, 135, 150, 0.10) 45%,
      transparent 72%
    );
}


@keyframes nebulaFloat {

  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }

  100% {
    transform: translate3d(40px, -20px, 0) scale(1.08);
  }

}



/* =========================================================
   헤더
========================================================= */

.site-header {
  position: sticky;

  top: 0;

  z-index: 30;

  backdrop-filter: blur(18px);

  background:
    rgba(3, 10, 22, 0.68);

  border-bottom:
    1px solid rgba(255, 255, 255, 0.05);
}


.header-inner {
  display: flex;

  align-items: center;

  justify-content: space-between;

  min-height: 106px;

  gap: 40px;
}


.brand {
  display: flex;

  align-items: center;
}


.brand-logo {
  width: 300px;

  max-width: 46vw;

  filter:
    drop-shadow(
      0 0 10px rgba(98, 187, 255, 0.22)
    );
}


.site-nav {
  display: flex;

  align-items: center;

  gap: 38px;
}


.site-nav a {
  position: relative;

  font-size: 14px;

  font-weight: 500;

  color: #eef5ff;

  letter-spacing: 0.09em;
}


.site-nav a::after {
  content: "";

  position: absolute;

  left: 0;

  bottom: -10px;

  width: 0;

  height: 2px;

  border-radius: 99px;

  background:
    linear-gradient(
      90deg,
      var(--primary),
      var(--accent)
    );

  transition: width 0.25s ease;
}


.site-nav a:hover::after {
  width: 100%;
}


.menu-toggle {
  display: none;

  background: transparent;

  border: 0;

  padding: 0;

  cursor: pointer;
}


.menu-toggle span {
  display: block;

  width: 28px;
  height: 2px;

  background: white;

  margin: 6px 0;

  border-radius: 999px;
}



/* =========================================================
   HERO
========================================================= */

.hero {
  position: relative;

  z-index: 2;

  min-height:
    calc(100vh - 106px);

  display: flex;

  align-items: center;

  padding:
    110px 0 120px;
}


.hero-grid {
  display: grid;

  grid-template-columns:
    minmax(0, 1.18fr)
    minmax(380px, 0.82fr);

  gap: 90px;

  align-items: center;
}


.hero-copy {
  max-width: 850px;
}


.hero-copy h1 {
  font-size:
    clamp(58px, 6vw, 102px);

  line-height: 0.98;

  letter-spacing: -0.045em;

  margin-bottom: 32px;

  text-shadow:
    0 0 30px rgba(133, 199, 255, 0.08);
}


.hero-text {
  max-width: 720px;

  font-size: 18px;

  margin-bottom: 38px;

  line-height: 1.85;
}


.hero-buttons {
  display: flex;

  flex-wrap: wrap;

  gap: 16px;
}


.btn {
  display: inline-flex;

  align-items: center;

  justify-content: center;

  min-width: 180px;

  padding: 16px 26px;

  border-radius: 999px;

  font-weight: 600;

  font-size: 14px;

  letter-spacing: 0.08em;

  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}


.btn:hover {
  transform: translateY(-3px);
}


.btn-primary {

  color: #06111c;

  background:
    linear-gradient(
      90deg,
      #77d7ff,
      #66ffd5
    );

  box-shadow:
    0 12px 35px rgba(74, 205, 255, 0.25);
}


.btn-primary:hover {

  box-shadow:
    0 16px 42px rgba(74, 205, 255, 0.38);
}


.btn-secondary {

  color: white;

  border:
    1px solid rgba(255, 255, 255, 0.18);

  background:
    rgba(255, 255, 255, 0.03);
}



.hero-visual {
  display: flex;

  justify-content: center;

  align-items: center;
}


.hero-glow-card {

  width: min(100%, 540px);

  min-height: 420px;

  padding: 54px 40px;

  border-radius: 32px;

  display: flex;

  flex-direction: column;

  align-items: center;

  justify-content: center;

  background:
    linear-gradient(
      180deg,
      rgba(10, 32, 63, 0.64),
      rgba(6, 17, 32, 0.74)
    );

  border:
    1px solid rgba(128, 197, 255, 0.22);

  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.4),
    0 0 80px rgba(69, 160, 255, 0.08);

  position: relative;

  overflow: hidden;

  backdrop-filter: blur(20px);
}


.hero-glow-card::after {

  content: "";

  position: absolute;

  width: 300px;
  height: 300px;

  top: -120px;
  right: -120px;

  border-radius: 50%;

  background:
    radial-gradient(
      circle,
      rgba(96, 189, 255, 0.18),
      transparent 68%
    );

}


.hero-glow-card::before {

  content: "";

  position: absolute;

  inset: -1px;

  border-radius: inherit;

  padding: 1px;

  background:
    linear-gradient(
      135deg,
      rgba(124, 207, 255, 0.45),
      rgba(101, 255, 217, 0.08),
      rgba(124, 126, 255, 0.28)
    );

  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);

  -webkit-mask-composite: xor;

  mask-composite: exclude;
}


.hero-glow-card img {

  width: 100%;

  max-width: 350px;

  margin: 0 auto 32px;

  filter:
    drop-shadow(
      0 0 18px rgba(107, 192, 255, 0.22)
    );
}


.hero-glow-card p {

  position: relative;

  z-index: 2;

  max-width: 360px;

  text-align: center;

  font-size: 15px;
}



/* =========================================================
   공통 카드
========================================================= */

.card {

  background:
    linear-gradient(
      180deg,
      rgba(11, 25, 47, 0.62),
      rgba(5, 14, 28, 0.65)
    );

  border:
    1px solid var(--line);

  border-radius:
    var(--radius);

  padding: 32px;

  box-shadow:
    var(--shadow);

  backdrop-filter:
    blur(18px);

  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
}


.card:hover {

  transform:
    translateY(-5px);

  border-color:
    rgba(132, 205, 255, 0.32);

  box-shadow:
    0 30px 65px rgba(0, 0, 0, 0.45),
    0 0 30px rgba(91, 168, 255, 0.08);
}



/* =========================================================
   ABOUT
========================================================= */

.about-grid {

  display: grid;

  grid-template-columns:
    1.2fr 0.8fr;

  gap: 28px;

  align-items: stretch;
}


.about-side {

  display: grid;

  gap: 28px;
}


.about-main p {

  font-size: 18px;

  line-height: 1.9;
}



/* =========================================================
   BUSINESS
========================================================= */

.business-grid {

  display: grid;

  grid-template-columns:
    repeat(4, 1fr);

  gap: 24px;
}


.business-card {

  min-height: 280px;
}


.business-card .icon {

  width: 58px;
  height: 58px;

  border-radius: 16px;

  display: grid;

  place-items: center;

  font-size: 22px;

  margin-bottom: 22px;

  color: white;

  background:
    linear-gradient(
      135deg,
      rgba(125, 200, 255, 0.20),
      rgba(102, 255, 217, 0.12)
    );

  border:
    1px solid rgba(134, 205, 255, 0.26);

  box-shadow:
    0 0 20px rgba(93, 191, 255, 0.08);
}


.business-card h3 {

  font-size: 21px;

  margin-bottom: 14px;
}



/* =========================================================
   PROJECTS
========================================================= */

.project-grid {

  display: grid;

  grid-template-columns:
    repeat(3, 1fr);

  gap: 26px;
}


.project-card {

  min-height: 400px;

  border-radius: 28px;

  overflow: hidden;

  position: relative;

  border:
    1px solid rgba(138, 193, 255, 0.18);

  box-shadow:
    var(--shadow);

  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}


.project-card:hover {

  transform:
    translateY(-6px)
    scale(1.01);

  box-shadow:
    0 32px 70px rgba(0, 0, 0, 0.48);
}


.project-one {

  background:

    radial-gradient(
      circle at 50% 15%,
      rgba(121, 113, 255, 0.48),
      transparent 36%
    ),

    linear-gradient(
      180deg,
      rgba(8, 18, 36, 0.08),
      rgba(8, 18, 36, 0.94)
    ),

    url(
      'https://images.unsplash.com/photo-1493225457124-a3eb161ffa5f?auto=format&fit=crop&w=1600&q=85'
    )

    center / cover;
}


.project-two {

  background:

    radial-gradient(
      circle at 50% 15%,
      rgba(98, 190, 255, 0.40),
      transparent 36%
    ),

    linear-gradient(
      180deg,
      rgba(8, 18, 36, 0.12),
      rgba(8, 18, 36, 0.94)
    ),

    url(
      'https://images.unsplash.com/photo-1516280440614-37939bbacd81?auto=format&fit=crop&w=1600&q=85'
    )

    center / cover;
}


.project-three {

  background:

    radial-gradient(
      circle at 50% 15%,
      rgba(97, 255, 215, 0.30),
      transparent 36%
    ),

    linear-gradient(
      180deg,
      rgba(8, 18, 36, 0.12),
      rgba(8, 18, 36, 0.94)
    ),

    url(
      'https://images.unsplash.com/photo-1511379938547-c1f69419868d?auto=format&fit=crop&w=1600&q=85'
    )

    center / cover;
}


.project-overlay {

  position: absolute;

  inset: auto 0 0 0;

  padding: 34px;

  background:
    linear-gradient(
      180deg,
      transparent,
      rgba(3, 8, 17, 0.95)
    );
}


.project-overlay h3 {

  margin-bottom: 10px;

  font-size: 26px;
}



/* =========================================================
   CONTACT
========================================================= */

.contact-grid {

  display: grid;

  grid-template-columns:
    1fr 1fr;

  gap: 28px;
}


.contact-list {

  list-style: none;

  padding: 0;

  margin: 0;
}


.contact-list li {

  margin-bottom: 16px;

  color: var(--muted);
}



/* =========================================================
   FOOTER
========================================================= */

.site-footer {

  position: relative;

  z-index: 2;

  padding:
    40px 0 60px;

  border-top:
    1px solid rgba(255, 255, 255, 0.06);

  background:
    rgba(3, 9, 19, 0.54);

  backdrop-filter:
    blur(12px);
}


.footer-inner {

  display: flex;

  align-items: center;

  justify-content: space-between;

  gap: 28px;
}


.footer-brand img {

  width: 240px;
}


.footer-text p {

  margin:
    0 0 8px;

  text-align: right;
}



/* =========================================================
   반응형
========================================================= */

@media (max-width: 1200px) {

  .container {
    width:
      min(
        var(--container),
        calc(100% - 50px)
      );
  }


  .business-grid {
    grid-template-columns:
      repeat(2, 1fr);
  }


  .hero-grid {

    grid-template-columns:
      1fr 0.8fr;

    gap: 50px;
  }


  .hero-copy h1 {

    font-size:
      clamp(
        54px,
        6vw,
        82px
      );
  }

}



@media (max-width: 900px) {

  .hero-grid,
  .about-grid,
  .contact-grid {

    grid-template-columns:
      1fr;
  }


  .hero {

    min-height: auto;

    padding-top: 120px;
  }


  .hero-visual {

    justify-content:
      flex-start;
  }


  .menu-toggle {

    display:
      block;
  }


  .site-nav {

    position:
      absolute;

    top:
      106px;

    left:
      20px;

    right:
      20px;

    display:
      none;

    flex-direction:
      column;

    align-items:
      flex-start;

    gap:
      18px;

    padding:
      24px;

    border-radius:
      20px;

    background:
      rgba(5, 12, 23, 0.97);

    border:
      1px solid rgba(255, 255, 255, 0.08);
  }


  .site-nav.active {

    display:
      flex;
  }


  .footer-inner {

    flex-direction:
      column;

    align-items:
      flex-start;
  }


  .footer-text p {

    text-align:
      left;
  }

}



@media (max-width: 720px) {

  .container {

    width:
      calc(100% - 32px);
  }


  .business-grid {

    grid-template-columns:
      1fr;
  }


  .project-grid {

    grid-template-columns:
      1fr;
  }


  .section {

    padding:
      90px 0;
  }


  .brand-logo {

    width:
      210px;
  }


  .header-inner {

    min-height:
      90px;
  }


  .site-nav {

    top:
      90px;
  }


  .hero {

    padding:
      100px 0 90px;
  }


  .hero-copy h1 {

    font-size:
      clamp(
        44px,
        14vw,
        68px
      );
  }


  .hero-text {

    font-size:
      16px;
  }


  .hero-glow-card {

    min-height:
      360px;

    padding:
      42px 26px;
  }


  .btn {

    width:
      100%;
  }

}
/* =========================================
   SCROLL FADE-IN ANIMATION
========================================= */

.fade-section {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 0.9s ease,
    transform 0.9s ease;
}

.fade-section.show {
  opacity: 1;
  transform: translateY(0);
}
/* =========================================================
   SECTION POSITION / NAVIGATION ALIGNMENT
========================================================= */

/* 각 상세 섹션을 최소 한 화면 높이로 */
.section {
  min-height: calc(100vh - 106px);
  display: flex;
  align-items: center;
  scroll-margin-top: 106px;
}

/* 섹션 내부 컨테이너는 전체 폭 유지 */
.section > .container {
  width: min(var(--container), calc(100% - 80px));
}

/* HERO도 메뉴 이동 기준 보정 */
.hero {
  scroll-margin-top: 106px;
}

/* 모바일 */
@media (max-width: 900px) {

  .section {
    min-height: auto;
    padding-top: 110px;
    padding-bottom: 110px;
    scroll-margin-top: 90px;
  }

  .hero {
    scroll-margin-top: 90px;
  }

}
/* =========================================================
   MOBILE OPTIMIZATION
========================================================= */

@media (max-width: 768px) {

  html,
  body {
    width: 100%;
    overflow-x: hidden;
  }

  .container {
    width: calc(100% - 32px);
    max-width: 100%;
    margin: 0 auto;
  }

  /* HEADER */
  .site-header {
    background: rgba(3, 10, 22, 0.88);
    backdrop-filter: blur(18px);
  }

  .header-inner {
    min-height: 76px;
    padding: 0;
  }

  .brand-logo {
    width: 170px;
    max-width: 60vw;
  }

  .menu-toggle {
    display: block;
    position: relative;
    z-index: 50;
  }

  .site-nav {
    position: absolute;

    top: 76px;
    left: 16px;
    right: 16px;

    display: none;

    flex-direction: column;
    align-items: stretch;

    gap: 0;

    padding: 14px 20px;

    background: rgba(4, 12, 25, 0.97);

    border:
      1px solid rgba(125, 200, 255, 0.16);

    border-radius: 18px;

    box-shadow:
      0 25px 60px rgba(0, 0, 0, 0.45);
  }

  .site-nav.active {
    display: flex;
  }

  .site-nav a {
    width: 100%;

    padding: 14px 4px;

    font-size: 14px;

    border-bottom:
      1px solid rgba(255, 255, 255, 0.06);
  }

  .site-nav a:last-child {
    border-bottom: none;
  }

  /* HERO */
  .hero {
    min-height: auto;

    padding:
      120px 0 75px;

    scroll-margin-top: 76px;
  }

  .hero-grid {
    display: grid;

    grid-template-columns: 1fr;

    gap: 45px;
  }

  .hero-copy {
    max-width: 100%;
  }

  .hero-copy h1 {
    font-size: clamp(42px, 12vw, 62px);

    line-height: 1.02;

    letter-spacing: -0.04em;

    margin-bottom: 24px;
  }

  .hero-text {
    font-size: 15px;

    line-height: 1.75;

    margin-bottom: 30px;
  }

  .eyebrow {
    font-size: 11px;

    letter-spacing: 0.18em;
  }

  .hero-buttons {
    display: grid;

    grid-template-columns: 1fr;

    gap: 12px;
  }

  .btn {
    width: 100%;

    min-width: 0;

    padding: 15px 20px;

    font-size: 13px;
  }

  .hero-visual {
    width: 100%;

    justify-content: center;
  }

  .hero-glow-card {
    width: 100%;

    min-height: 320px;

    padding:
      35px 24px;

    border-radius: 24px;
  }

  .hero-glow-card img {
    max-width: 250px;

    margin-bottom: 24px;
  }

  .hero-glow-card p {
    font-size: 14px;
  }

  /* SECTION */
  .section {
    min-height: auto;

    padding:
      85px 0;

    display: block;

    scroll-margin-top: 76px;
  }

  .section > .container {
    width: calc(100% - 32px);
  }

  .section-head {
    margin-bottom: 28px;
  }

  h2 {
    font-size: clamp(30px, 9vw, 42px);

    line-height: 1.08;
  }

  /* ABOUT */
  .about-grid {
    grid-template-columns: 1fr;

    gap: 18px;
  }

  .about-side {
    gap: 18px;
  }

  .about-main p {
    font-size: 15px;

    line-height: 1.8;
  }

  /* CARD */
  .card {
    width: 100%;

    padding: 24px;

    border-radius: 20px;
  }

  .card h3 {
    font-size: 18px;
  }

  .card p {
    font-size: 14px;
  }

  /* BUSINESS */
  .business-grid {
    grid-template-columns: 1fr;

    gap: 16px;
  }

  .business-card {
    min-height: auto;
  }

  /* PROJECTS */
  .project-grid {
    grid-template-columns: 1fr;

    gap: 18px;
  }

  .project-card {
    min-height: 320px;

    border-radius: 22px;
  }

  .project-overlay {
    padding: 24px;
  }

  .project-overlay h3 {
    font-size: 21px;
  }

  /* CONTACT */
  .contact-grid {
    grid-template-columns: 1fr;

    gap: 18px;
  }

  .contact-list li {
    font-size: 14px;

    word-break: break-word;
  }

  /* FOOTER */
  .footer-inner {
    flex-direction: column;

    align-items: flex-start;

    gap: 22px;
  }

  .footer-brand img {
    width: 190px;
  }

  .footer-text p {
    text-align: left;

    font-size: 12px;

    line-height: 1.6;
  }

}


/* 작은 휴대폰 */
@media (max-width: 430px) {

  .container {
    width: calc(100% - 24px);
  }

  .hero-copy h1 {
    font-size: 40px;
  }

  .brand-logo {
    width: 150px;
  }

  .hero-glow-card {
    min-height: 290px;
  }

  .section {
    padding:
      70px 0;
  }

  .card {
    padding: 20px;
  }

}