@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;600;700&display=swap');

:root {
  --navy: #102B40;
  --deep-blue: #183F59;
  --blue: #68B9D8;
  --light-blue: #B8DDE9;
  --orange: #F29B55;
  --cream: #F6F3EC;
  --white: #FFFFFF;
  --text: #20384A;
  --muted: #82919A;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'DM Sans', 'Noto Sans KR', sans-serif;
  color: var(--text);
  background: var(--cream);
}

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

.site-header {
  height: 76px;
  padding: 0 7%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--navy);
  color: var(--white);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 1px;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--orange);
  color: var(--navy);
}

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

.main-nav {
  display: flex;
  gap: 34px;
  font-size: 13px;
  color: #D5E1E8;
}

.main-nav a:hover {
  color: var(--orange);
}

.menu-toggle {
  display: none;
}

.hero {
  position: relative;
  min-height: 690px;
  overflow: hidden;
  padding: 105px 10% 50px;
  background: var(--navy);
  color: var(--white);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
}

.eyebrow,
.section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
}

.eyebrow {
  color: var(--orange);
  margin-bottom: 25px;
}

.hero h1 {
  font-size: clamp(54px, 7vw, 94px);
  line-height: .98;
  letter-spacing: -4px;
  font-weight: 800;
}

.hero h1 span {
  color: var(--blue);
}

.hero-description {
  margin-top: 30px;
  line-height: 2;
  color: #C6D4DD;
  font-size: 14px;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  gap: 25px;
  margin-top: 35px;
  padding: 15px 22px;
  background: var(--orange);
  color: var(--navy);
  font-size: 13px;
  font-weight: 700;
  transition: .2s;
}

.primary-button:hover {
  background: var(--white);
  transform: translateY(-3px);
}

.hero-decoration {
  position: absolute;
  width: 53%;
  height: 100%;
  right: 0;
  top: 0;
  overflow: hidden;
  opacity: .95;
}

.sun {
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: var(--orange);
  right: 20%;
  top: 16%;
  box-shadow: 0 0 100px rgba(242,155,85,.2);
}

.wave {
  position: absolute;
  width: 150%;
  height: 220px;
  left: -20%;
  border-radius: 50% 50% 0 0;
  transform: rotate(-12deg);
}

.wave-one {
  top: 52%;
  background: #285D77;
}

.wave-two {
  top: 61%;
  background: #397E9A;
  transform: rotate(9deg);
}

.wave-three {
  top: 70%;
  background: #68B9D8;
  transform: rotate(-5deg);
}

.hero-caption {
  position: absolute;
  right: 12%;
  bottom: 10%;
  font-size: 10px;
  line-height: 1.8;
  letter-spacing: 2px;
  color: var(--navy);
  font-weight: 800;
}

.hero-bottom {
  position: absolute;
  z-index: 2;
  bottom: 28px;
  left: 10%;
  right: 10%;
  display: flex;
  justify-content: space-between;
  color: #9EB6C4;
  font-size: 9px;
  letter-spacing: 2px;
}

.intro-section,
.spectrum-section,
.participate-section,
.songs-section {
  padding: 110px 10%;
}

.intro-section {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 50px;
  background: var(--cream);
}

.section-label {
  color: #C47A3C;
}

.intro-content h2,
.participate-section h2 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.35;
  letter-spacing: -1.5px;
}

.intro-content p {
  max-width: 650px;
  margin-top: 25px;
  color: #647681;
  font-size: 14px;
  line-height: 2.1;
  word-break: keep-all;
}

.spectrum-section {
  background: #E7EFF0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 45px;
}

.section-heading h2,
.songs-section h2 {
  margin-top: 15px;
  font-size: clamp(32px, 5vw, 54px);
  line-height: 1.1;
  letter-spacing: -2px;
}

.section-heading > p {
  color: #70828C;
  font-size: 13px;
  line-height: 1.8;
}

.chart-panel {
  padding: 25px 30px;
  background: var(--navy);
  color: var(--white);
}

.chart-topline,
.chart-footer {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  letter-spacing: 2px;
  color: #A7BFCC;
}

.chart-area {
  position: relative;
  padding: 40px 35px;
}

.chart-grid {
  position: relative;
  height: 390px;
  border: 1px solid rgba(184,221,233,.35);
  background-image:
    linear-gradient(rgba(184,221,233,.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184,221,233,.10) 1px, transparent 1px);
  background-size: 25% 25%;
}

.chart-center-line {
  position: absolute;
  background: rgba(184,221,233,.4);
}

.chart-center-line.vertical {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
}

.chart-center-line.horizontal {
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
}

.chart-message {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  text-align: center;
}

.chart-symbol {
  color: var(--orange);
  font-size: 36px;
  font-weight: 800;
}

.chart-message strong {
  font-size: 12px;
  letter-spacing: 2px;
}

.chart-message small {
  color: #A7BFCC;
  font-size: 11px;
}

.axis-label {
  position: absolute;
  color: #A7BFCC;
  font-size: 10px;
  letter-spacing: 1px;
}

.axis-top {
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
}

.axis-bottom {
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
}

.axis-left {
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}

.axis-right {
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.chart-footer {
  padding-top: 15px;
  border-top: 1px solid rgba(184,221,233,.2);
}

.participate-section {
  background: var(--navy);
  color: var(--white);
  text-align: center;
}

.participate-section .section-label {
  color: var(--orange);
  margin-bottom: 25px;
}

.participate-section p {
  margin-top: 22px;
  color: #B8CBD5;
  font-size: 14px;
  line-height: 2;
}

.coming-soon {
  display: inline-block;
  margin-top: 35px;
  padding: 10px 18px;
  border: 1px solid rgba(104,185,216,.5);
  color: var(--blue);
  font-size: 10px;
  letter-spacing: 2px;
}

.songs-section {
  background: var(--cream);
}

.songs-section > p {
  margin-top: 20px;
  color: #647681;
  font-size: 14px;
  line-height: 1.8;
}

.site-footer {
  padding: 45px 10%;
  background: #0B2030;
  color: #A7BFCC;
  text-align: center;
}

.footer-logo {
  color: var(--orange);
  font-size: 22px;
  font-weight: 800;
}

.site-footer p {
  margin-top: 12px;
  font-size: 10px;
  letter-spacing: 2px;
}

.site-footer > span {
  display: block;
  margin-top: 20px;
  font-size: 8px;
  letter-spacing: 1px;
  color: #718B9A;
}

@media (max-width: 760px) {
  .site-header {
    height: 65px;
    padding: 0 6%;
  }

  .menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 6px;
    border: 0;
    background: none;
    cursor: pointer;
  }

  .menu-toggle span {
    display: block;
    width: 23px;
    height: 2px;
    background: var(--white);
  }

  .main-nav {
    display: none;
    position: absolute;
    z-index: 10;
    top: 65px;
    left: 0;
    right: 0;
    padding: 25px 6%;
    background: var(--navy);
    flex-direction: column;
    gap: 22px;
  }

  .main-nav.open {
    display: flex;
  }

  .hero {
    min-height: 650px;
    padding: 90px 7% 65px;
  }

  .hero h1 {
    font-size: clamp(52px, 12vw, 76px);
    letter-spacing: -3px;
  }

  .hero-decoration {
    width: 100%;
    opacity: .32;
  }

  .sun {
    width: 190px;
    height: 190px;
    right: 10%;
    top: 35%;
  }

  .hero-bottom {
    left: 7%;
    right: 7%;
    font-size: 7px;
  }

  .intro-section {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .intro-section,
  .spectrum-section,
  .participate-section,
  .songs-section {
    padding: 75px 7%;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
    gap: 20px;
  }

  .chart-panel {
    padding: 18px 12px;
  }

  .chart-area {
    padding: 38px 23px;
  }

  .chart-grid {
    height: 300px;
  }

  .chart-message strong {
    font-size: 9px;
  }

  .chart-message small {
    max-width: 220px;
    line-height: 1.6;
  }

  .chart-footer {
    font-size: 7px;
    letter-spacing: 1px;
  }
}