:root {
  --navy-950: #0b2239;
  --navy-900: #102f4c;
  --navy-800: #174462;
  --navy-700: #1e5878;
  --teal-700: #08766f;
  --teal-600: #0f8d84;
  --teal-100: #daf4f0;
  --blue-100: #e9f2f8;
  --orange-700: #94520a;
  --orange-100: #fff0d9;
  --violet-700: #67528d;
  --violet-100: #f0ebf8;
  --red-700: #a63a32;
  --red-100: #fdebe8;
  --ink: #17293b;
  --muted: #607181;
  --line: #dbe4ea;
  --line-strong: #c8d5de;
  --surface: #ffffff;
  --canvas: #f5f8fa;
  --shadow-sm: 0 5px 20px rgba(13, 42, 65, 0.07);
  --shadow-md: 0 18px 50px rgba(13, 42, 65, 0.12);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --shell: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.018em;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

button {
  color: inherit;
}

.shell {
  width: min(calc(100% - 40px), var(--shell));
  margin-inline: auto;
}

.svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  color: #fff;
  background: var(--navy-950);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid rgba(15, 141, 132, 0.45);
  outline-offset: 3px;
}

.notice-bar {
  color: #e7f1f7;
  background: var(--navy-950);
  font-size: 0.86rem;
}

.notice-bar__inner {
  min-height: 38px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.notice-bar strong {
  flex: 0 0 auto;
  padding: 2px 8px;
  color: #fff;
  background: rgba(15, 141, 132, 0.42);
  border-radius: 999px;
  font-size: 0.75rem;
}

.notice-bar a {
  margin-left: auto;
  color: #fff;
  font-weight: 750;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid rgba(219, 228, 234, 0.95);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--navy-900);
  border-radius: 13px 13px 13px 4px;
}

.brand-mark svg {
  width: 31px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.15;
}

.brand-mark svg path:last-child {
  color: #62d3c7;
}

.brand-copy strong,
.brand-copy small {
  display: block;
}

.brand-copy strong {
  color: var(--navy-950);
  font-size: 1.06rem;
  line-height: 1.3;
  letter-spacing: -0.035em;
}

.brand-copy small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.3;
}

.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}

.primary-nav a {
  padding: 10px 8px;
  color: #344a5e;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 750;
  white-space: nowrap;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--navy-900);
  background: var(--blue-100);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.menu-toggle > span:not(.visually-hidden) {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  background: var(--navy-950);
  border-radius: 2px;
  transition: transform 180ms ease, opacity 180ms ease;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 50px 0 54px;
  background:
    linear-gradient(rgba(16, 47, 76, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 47, 76, 0.035) 1px, transparent 1px),
    linear-gradient(135deg, #f7fbfc 0%, #eaf3f6 100%);
  background-size: 28px 28px, 28px 28px, auto;
}

.hero::after {
  content: "";
  position: absolute;
  right: -130px;
  bottom: -210px;
  width: 470px;
  height: 470px;
  border: 1px solid rgba(15, 141, 132, 0.13);
  border-radius: 50%;
  box-shadow: 0 0 0 52px rgba(15, 141, 132, 0.025), 0 0 0 104px rgba(15, 141, 132, 0.018);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(340px, 0.84fr);
  align-items: center;
  gap: clamp(36px, 6vw, 74px);
}

.eyebrow,
.section-kicker {
  color: var(--teal-700);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.045em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--teal-600);
}

.hero h1 {
  max-width: 730px;
  margin: 0;
  color: var(--navy-950);
  font-size: clamp(2.15rem, 4.1vw, 3.45rem);
  line-height: 1.17;
  letter-spacing: -0.055em;
}

.hero-lede {
  max-width: 660px;
  margin: 17px 0 23px;
  color: #4e6374;
  font-size: 1.05rem;
  line-height: 1.7;
}

.issue-search label {
  display: block;
  margin-bottom: 8px;
  color: var(--navy-900);
  font-size: 0.88rem;
  font-weight: 800;
}

.search-control {
  min-height: 60px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 6px 6px 6px 18px;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 15px;
  box-shadow: var(--shadow-sm);
}

.search-control:focus-within {
  border-color: var(--teal-600);
  box-shadow: 0 0 0 4px rgba(15, 141, 132, 0.1), var(--shadow-sm);
}

.search-control > .icon {
  color: var(--teal-700);
  font-size: 1.15rem;
}

.search-control input {
  min-width: 0;
  padding: 10px 2px;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: 0;
  font-size: 0.98rem;
}

.search-control input::placeholder {
  color: #8896a2;
}

.search-control button,
.empty-state button {
  min-height: 46px;
  padding: 0 19px;
  color: #fff;
  background: var(--teal-700);
  border: 0;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 800;
  cursor: pointer;
}

.search-control button:hover,
.empty-state button:hover {
  background: #06665f;
}

.quick-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 13px;
}

.quick-links > span {
  margin-right: 2px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.quick-links button {
  padding: 5px 10px;
  color: #365369;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid #cddce3;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
}

.quick-links button:hover {
  color: var(--teal-700);
  background: #fff;
  border-color: #92c8c3;
}

.search-status {
  min-height: 1.5em;
  margin: 8px 0 0;
  color: var(--teal-700);
  font-size: 0.86rem;
  font-weight: 700;
}

.solve-panel {
  overflow: hidden;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(200, 213, 222, 0.94);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.solve-panel__heading {
  padding: 23px 25px 19px;
  color: #fff;
  background: var(--navy-900);
}

.solve-panel__heading span {
  color: #9fe5de;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.solve-panel__heading h2 {
  margin: 6px 0 0;
  font-size: 1.35rem;
  line-height: 1.38;
  letter-spacing: -0.035em;
}

.solve-steps {
  margin: 0;
  padding: 11px 24px 17px;
  list-style: none;
}

.solve-steps li {
  position: relative;
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: center;
  gap: 11px;
  padding: 12px 0;
}

.solve-steps li:not(:last-child) {
  border-bottom: 1px solid var(--line);
}

.solve-steps li > span {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: var(--teal-700);
  background: var(--teal-100);
  border-radius: 50%;
  font-size: 0.74rem;
  font-weight: 850;
}

.solve-steps strong,
.solve-steps small {
  display: block;
}

.solve-steps strong {
  color: var(--navy-950);
  font-size: 0.92rem;
}

.solve-steps small {
  margin-top: 1px;
  color: var(--muted);
  font-size: 0.78rem;
}

.category-section,
.guide-section,
.principle-section {
  padding: 64px 0;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading--split {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
}

.section-heading h2,
.principle-grid h2 {
  margin: 5px 0 0;
  color: var(--navy-950);
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  line-height: 1.28;
  letter-spacing: -0.045em;
}

.section-heading > p {
  margin: 0 0 5px;
  color: var(--muted);
  font-size: 0.92rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 10px;
}

.category-card {
  min-width: 0;
  min-height: 144px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 14px;
  text-align: left;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 15px;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.category-card:hover,
.category-card.is-selected {
  transform: translateY(-3px);
  border-color: #80c5bd;
  box-shadow: var(--shadow-sm);
}

.category-card.is-selected {
  background: #f4fbfa;
}

.category-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: var(--teal-700);
  background: var(--teal-100);
  border-radius: 11px;
  font-size: 1.12rem;
}

.category-card strong,
.category-card small {
  display: block;
}

.category-card strong {
  min-height: 2.8em;
  color: var(--navy-950);
  font-size: 0.91rem;
  line-height: 1.4;
}

.category-card small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.45;
}

.guide-section {
  background: var(--canvas);
  border-top: 1px solid #edf1f4;
  border-bottom: 1px solid #edf1f4;
}

.guide-heading {
  align-items: center;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.filter-button {
  padding: 7px 12px;
  color: #526777;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 750;
  cursor: pointer;
}

.filter-button:hover,
.filter-button.is-active {
  color: #fff;
  background: var(--navy-900);
  border-color: var(--navy-900);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.guide-card {
  min-width: 0;
  min-height: 238px;
  display: flex;
  flex-direction: column;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: 0 3px 14px rgba(13, 42, 65, 0.035);
}

.guide-card--featured {
  color: #fff;
  background: var(--navy-900);
  border-color: var(--navy-900);
}

.guide-card[hidden] {
  display: none;
}

.guide-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.topic-tag {
  padding: 4px 9px;
  color: #17675f;
  background: var(--teal-100);
  border-radius: 999px;
  font-size: 0.73rem;
  font-weight: 800;
}

.topic-tag--blue {
  color: #245875;
  background: var(--blue-100);
}

.topic-tag--aqua,
.topic-tag--mint {
  color: #17675f;
  background: var(--teal-100);
}

.topic-tag--orange {
  color: var(--orange-700);
  background: var(--orange-100);
}

.topic-tag--violet {
  color: var(--violet-700);
  background: var(--violet-100);
}

.guide-number {
  color: #9aa8b3;
  font-size: 0.78rem;
  font-weight: 850;
}

.guide-card--featured .guide-number {
  color: #98b4c8;
}

.guide-card h3 {
  margin: 22px 0 9px;
  color: var(--navy-950);
  font-size: 1.16rem;
  line-height: 1.45;
  letter-spacing: -0.035em;
}

.guide-card h3 a {
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  transition: text-decoration-color 160ms ease;
}

.guide-card h3 a:hover,
.guide-card h3 a:focus-visible {
  text-decoration-color: currentColor;
}

.guide-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.guide-card--featured h3,
.guide-card--featured p {
  color: #fff;
}

.guide-card--featured p {
  color: #cbdbe7;
}

.guide-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 20px;
  color: #7b8b98;
  font-size: 0.76rem;
  font-weight: 700;
}

.guide-card--featured .guide-meta {
  color: #a9c1d2;
}

.empty-state {
  padding: 45px 24px;
  text-align: center;
  background: #fff;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
}

.empty-state strong {
  color: var(--navy-950);
  font-size: 1.08rem;
}

.empty-state p {
  margin: 7px 0 17px;
  color: var(--muted);
}

.safety-section {
  padding: 48px 0 0;
}

.safety-card {
  display: grid;
  grid-template-columns: 62px 1fr;
  align-items: center;
  gap: 22px;
  padding: 30px 34px;
  background: var(--red-100);
  border: 1px solid #f3ccc6;
  border-radius: var(--radius-md);
}

.safety-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  color: var(--red-700);
  background: #fff;
  border-radius: 17px;
  font-size: 1.45rem;
}

.safety-card span {
  color: var(--red-700);
  font-size: 0.78rem;
  font-weight: 850;
}

.safety-card h2 {
  margin: 4px 0 5px;
  color: #642d29;
  font-size: 1.3rem;
  line-height: 1.35;
  letter-spacing: -0.035em;
}

.safety-card p {
  margin: 0;
  color: #75524e;
  font-size: 0.9rem;
}

.principle-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr);
  align-items: start;
  gap: clamp(40px, 8vw, 110px);
}

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

.principle-grid li {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 14px 0;
  color: #42596b;
  border-bottom: 1px solid var(--line);
  font-size: 0.93rem;
}

.principle-grid li:first-child {
  border-top: 1px solid var(--line);
}

.principle-grid li .icon {
  flex: 0 0 auto;
  margin-top: 3px;
  color: var(--teal-700);
}

.site-footer {
  color: #cbd9e4;
  background: var(--navy-950);
}

.footer-main {
  min-height: 150px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.footer-main strong {
  color: #fff;
  font-size: 1.1rem;
}

.footer-main p {
  margin: 6px 0 0;
  color: #9eb2c2;
  font-size: 0.84rem;
}

.footer-main nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  max-width: 520px;
  font-size: 0.8rem;
}

.footer-bottom {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: #7790a4;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
}

@media (max-width: 1080px) {
  .header-inner {
    min-height: 72px;
  }

  .menu-toggle {
    display: block;
  }

  .menu-toggle[aria-expanded="true"] > span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] > span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[aria-expanded="true"] > span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .primary-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 20px;
    left: 20px;
    display: none;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-md);
  }

  .primary-nav.is-open {
    display: grid;
  }

  .primary-nav a {
    padding: 11px 12px;
    background: var(--canvas);
  }

  .category-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .hero {
    padding: 42px 0 48px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .solve-panel {
    display: grid;
    grid-template-columns: minmax(205px, 0.72fr) minmax(0, 1.28fr);
  }

  .solve-panel__heading {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .category-section,
  .guide-section,
  .principle-section {
    padding: 52px 0;
  }

  .category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .category-card {
    min-height: 118px;
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: start;
  }

  .category-card strong {
    min-height: auto;
  }

  .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .principle-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }
}

@media (max-width: 580px) {
  .shell {
    width: min(calc(100% - 28px), var(--shell));
  }

  .notice-bar__inner {
    min-height: 34px;
  }

  .notice-bar__inner > span,
  .notice-bar a {
    display: none;
  }

  .brand-copy small {
    display: none;
  }

  .brand-mark {
    width: 39px;
    height: 39px;
  }

  .primary-nav {
    right: 14px;
    left: 14px;
    grid-template-columns: 1fr;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .hero {
    padding: 35px 0 40px;
  }

  .hero h1 {
    font-size: clamp(2rem, 10vw, 2.55rem);
  }

  .hero-lede {
    margin-top: 14px;
    font-size: 0.98rem;
  }

  .search-control {
    grid-template-columns: auto minmax(0, 1fr);
    min-height: 58px;
    padding: 5px 14px;
  }

  .search-control button {
    grid-column: 1 / -1;
    width: calc(100% + 28px);
    margin: 1px -14px -5px;
    border-radius: 0 0 12px 12px;
  }

  .quick-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quick-links > span {
    grid-column: 1 / -1;
  }

  .quick-links button {
    min-height: 34px;
  }

  .solve-panel {
    display: block;
  }

  .solve-panel__heading {
    padding: 20px 21px 17px;
  }

  .solve-steps {
    padding-inline: 20px;
  }

  .section-heading--split {
    display: block;
  }

  .section-heading > p {
    margin-top: 10px;
  }

  .category-grid,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .category-card {
    min-height: 105px;
    padding: 16px;
  }

  .guide-heading {
    display: block;
  }

  .filter-row {
    margin-top: 17px;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 5px;
  }

  .filter-button {
    flex: 0 0 auto;
  }

  .guide-card {
    min-height: 215px;
  }

  .safety-section {
    padding-top: 36px;
  }

  .safety-card {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 24px;
  }

  .safety-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
  }

  .footer-main {
    min-height: 0;
    display: block;
    padding: 38px 0 30px;
  }

  .footer-main nav {
    justify-content: flex-start;
    margin-top: 24px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
    padding: 14px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}