:root {
  color-scheme: light;
  --bg: #f7f8fc;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #636d7e;
  --accent: #0b6efd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Noto Sans KR",
    sans-serif;
  background: radial-gradient(circle at 10% 10%, #ffffff 0%, var(--bg) 55%);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid #e4e8f0;
}

.lang-selector-wrapper {
  position: relative;
}

.lang-selector-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid #e4e8f0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 0.875rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.lang-selector-btn:hover,
.lang-selector-btn[aria-expanded="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.lang-selector-btn .chevron {
  transition: transform 0.2s;
}

.lang-selector-btn[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.lang-selector-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 120px;
  background: var(--card);
  border: 1px solid #e4e8f0;
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  padding: 0.4rem;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
  z-index: 200;
}

.lang-selector-dropdown.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.lang-selector-item {
  display: block;
  padding: 0.6rem 0.85rem;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.12s;
}

.lang-selector-item:hover {
  background: #f0f4ff;
}

.lang-selector-item.active {
  color: var(--accent);
  font-weight: 600;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
}

.site-logo img {
  height: 44px;
  width: auto;
}

.site-logo span {
  font-size: 1.15rem;
  font-weight: 700;
}

.site-header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Nav Tools Dropdown */
.nav-tools-wrapper {
  position: relative;
}

.nav-tools-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 0.875rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.nav-tools-btn:hover,
.nav-tools-btn[aria-expanded="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.nav-tools-btn .chevron {
  transition: transform 0.2s;
}

.nav-tools-btn[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.nav-tools-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 300px;
  background: var(--card);
  border: 1px solid #e4e8f0;
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  padding: 0.4rem;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
  z-index: 200;
}

.nav-tools-dropdown.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-tools-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.7rem 0.85rem;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: background 0.12s;
}

.nav-tools-item:hover {
  background: #f0f4ff;
}

.nav-tools-item__icon {
  color: var(--accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, #eef3ff 0%, #e0eaff 100%);
}

.nav-tools-item__title {
  font-weight: 600;
  font-size: 0.88rem;
  line-height: 1.3;
}

.nav-tools-item__desc {
  color: var(--muted);
  font-size: 0.77rem;
  margin-top: 2px;
  line-height: 1.4;
}

@media (max-width: 540px) {
  .site-header {
    padding: 0.8rem 1rem;
    position: relative;
  }

  .site-logo span {
    display: none;
  }

  .nav-tools-wrapper {
    position: static;
  }

  .nav-tools-dropdown {
    left: 1rem;
    right: 1rem;
    min-width: unset;
  }

}

/* Main */
.container {
  width: min(760px, 92vw);
  margin: 2.5rem auto;
  flex: 1;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  border-top: 1px solid #e4e8f0;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0.3rem 0;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}

h1 {
  margin: 0.2rem 0 1.2rem;
}

/* ===== Homepage ===== */
.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.hero__logo {
  width: 96px;
  height: auto;
  margin-bottom: 1rem;
}

.hero__title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0;
  line-height: 1.6;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid #e4e8f0;
  border-radius: 14px;
  padding: 1.75rem;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.tool-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 30px rgba(11, 110, 253, 0.1);
  transform: translateY(-2px);
}

.tool-card__icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, #eef3ff 0%, #e0eaff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.tool-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.tool-card__desc {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 0 0 1rem;
  flex: 1;
}

.tool-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tool-card__tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 20px;
  background: #f0f4ff;
  color: #0057d1;
  font-weight: 500;
}

.home-more {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin: 1rem 0 2rem;
}

@media (max-width: 540px) {
  .hero {
    padding: 2rem 0 1.5rem;
  }

  .hero__title {
    font-size: 1.5rem;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Common ===== */
ul {
  padding-left: 1.2rem;
}

li {
  margin: 0.3rem 0;
}

code {
  background: #eef3ff;
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
}