:root {
  color-scheme: light;
  --bg: #f5f5f3;
  --panel: #ffffff;
  --ink: #111111;
  --muted: #68645d;
  --line: #deded9;
  --accent: #111111;
  --accent-dark: #000000;
  --accent-soft: #eeeeea;
  --warm: #9c7a4d;
  --shadow: 0 22px 55px rgba(17, 17, 17, 0.1);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 18% 0%, rgba(255, 255, 255, 0.95), transparent 34%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 72%);
  color: var(--ink);
  font-family:
    Inter, Pretendard, "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
    "Noto Sans KR", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px clamp(18px, 4vw, 54px);
  border-bottom: 1px solid rgba(17, 17, 17, 0.12);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 86px;
  height: 40px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font-size: 18px;
  font-weight: 950;
  letter-spacing: 0;
}

.brand-copy {
  display: grid;
  gap: 1px;
  line-height: 1.1;
}

.brand-copy strong {
  font-size: 15px;
}

.brand-copy small {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.nav {
  display: flex;
  gap: clamp(10px, 2vw, 24px);
  color: var(--muted);
  font-size: 14px;
}

.nav a {
  text-decoration: none;
}

.language-switcher {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.7);
}

.language-option {
  min-height: 32px;
  padding: 0 12px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.language-option.is-active {
  background: var(--ink);
  color: #ffffff;
}

main {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

#converter,
#formats,
#faq {
  scroll-margin-top: 170px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(24px, 5vw, 70px);
  align-items: center;
  min-height: 360px;
  padding: clamp(34px, 5vw, 62px) 0 22px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--warm);
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.04;
  letter-spacing: 0;
  word-break: keep-all;
  text-wrap: balance;
}

.hero-copy p:last-child {
  max-width: 640px;
  color: var(--muted);
  font-size: 18px;
  word-break: keep-all;
}

.hero-meter {
  display: grid;
  gap: 24px;
  align-content: center;
  min-height: 260px;
  padding: clamp(26px, 5vw, 44px);
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), transparent 70%),
    #ffffff;
  box-shadow: var(--shadow);
}

.studio-label {
  display: grid;
  gap: 2px;
  text-align: center;
}

.studio-label span {
  color: var(--ink);
  font-size: clamp(44px, 8vw, 78px);
  font-weight: 950;
  line-height: 0.9;
}

.studio-label small {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: lowercase;
}

.wave-row {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  align-items: center;
  gap: 8px;
  height: 92px;
}

.wave-row span {
  display: block;
  min-height: 18px;
  border-radius: 2px;
  background: var(--ink);
  animation: pulse 1.6s ease-in-out infinite;
}

.wave-row span:nth-child(2n) {
  height: 58px;
  animation-delay: -0.3s;
}

.wave-row span:nth-child(3n) {
  height: 84px;
  background: #595959;
  animation-delay: -0.65s;
}

.wave-row span:nth-child(5n) {
  height: 38px;
  background: var(--warm);
}

@keyframes pulse {
  50% {
    transform: scaleY(0.6);
    opacity: 0.72;
  }
}

.format-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.format-flow strong {
  display: grid;
  width: 78px;
  height: 56px;
  place-items: center;
  border-radius: 2px;
  background: var(--ink);
  color: #ffffff;
  font-size: 14px;
}

.format-flow span {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--ink), var(--warm));
}

.ad-slot {
  display: grid;
  min-height: 82px;
  place-items: center;
  margin: 22px 0 24px;
  border: 1px dashed #b8ad9c;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  text-align: center;
}

.ad-slot.is-hidden {
  display: none;
}

.ad-slot span {
  font-weight: 800;
}

.ad-slot small {
  display: block;
  margin-top: -18px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 20px;
  align-items: start;
}

.tool-panel,
.side-panel,
.info-grid article,
.faq {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
  box-shadow: 0 14px 34px rgba(17, 17, 17, 0.06);
}

.tool-panel,
.side-panel {
  padding: clamp(18px, 3vw, 28px);
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 18px;
}

.mode-tab {
  min-height: 42px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #ffffff;
  color: var(--muted);
  font-size: 14px;
}

.mode-tab.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.dropzone {
  display: grid;
  min-height: 250px;
  place-items: center;
  gap: 10px;
  padding: 28px;
  border: 2px dashed #b8ad9c;
  border-radius: 4px;
  background: #ffffff;
  color: var(--muted);
  cursor: pointer;
  text-align: center;
}

.dropzone.is-dragging {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.dropzone input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.dropzone strong {
  color: var(--ink);
  font-size: 22px;
}

.upload-icon {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border-radius: 2px;
  background: var(--accent);
  color: #ffffff;
  font-size: 36px;
  line-height: 1;
}

.settings {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.setting-block {
  display: grid;
  gap: 12px;
}

.settings label,
.side-panel h2,
.faq h2 {
  margin: 0;
  font-size: 18px;
}

.quality-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 92px;
  gap: 16px;
  align-items: center;
}

.trim-grid {
  grid-template-columns: 92px minmax(0, 1fr) 92px minmax(0, 1fr);
  align-items: center;
}

.trim-grid input {
  min-height: 42px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 12px;
  color: var(--ink);
  font: inherit;
}

input[type="range"] {
  accent-color: var(--ink);
}

output {
  font-weight: 800;
  color: var(--ink);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

button,
.download-link {
  min-height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: 4px;
  background: var(--accent);
  color: #ffffff;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.download-link {
  display: inline-grid;
  place-items: center;
  background: var(--warm);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.progress-shell {
  margin-top: 24px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 14px;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #e5ded1;
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--ink), var(--warm));
  transition: width 0.2s ease;
}

.file-details {
  display: grid;
  gap: 13px;
  margin: 18px 0 22px;
}

.file-details div {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

dt {
  color: var(--muted);
}

dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font-weight: 700;
}

.privacy-note {
  padding: 16px;
  border-radius: 4px;
  background: var(--accent-soft);
}

.privacy-note p {
  margin: 8px 0 0;
  color: #4b4740;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 28px 0;
}

.formats-section {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.72);
}

.formats-section h2 {
  margin: 0 0 6px;
}

.formats-section p {
  margin: 0;
  color: var(--muted);
}

.tool-links {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.tool-links a {
  display: grid;
  min-height: 44px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #ffffff;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

.info-grid article {
  padding: 22px;
}

.info-grid p,
.faq p {
  color: var(--muted);
}

.faq {
  margin-bottom: 36px;
  padding: 24px;
}

details {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-weight: 800;
}

details p {
  margin: 12px 0 0;
}

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 24px clamp(18px, 4vw, 54px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-brand {
  display: grid;
  gap: 3px;
}

.footer-title {
  color: var(--ink);
  font-weight: 900;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

.page-shell {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(42px, 7vw, 76px) 0;
}

.page-shell h1 {
  max-width: 760px;
  font-size: clamp(36px, 5vw, 58px);
}

.page-shell h2 {
  margin-top: 34px;
}

.page-shell p,
.page-shell li {
  color: var(--muted);
}

.page-shell a {
  color: var(--ink);
  font-weight: 800;
}

.localized-section {
  margin-top: 44px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.localized-section h3 {
  margin-top: 24px;
}

.landing-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 24px;
  align-items: start;
  margin-top: 28px;
}

.landing-card {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px;
}

.landing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.primary-link,
.secondary-link {
  display: inline-grid;
  min-height: 46px;
  place-items: center;
  padding: 0 18px;
  border-radius: 4px;
  text-decoration: none;
}

.primary-link {
  background: var(--ink);
  color: #ffffff !important;
}

.secondary-link {
  border: 1px solid var(--line);
  color: var(--ink) !important;
}

@media (max-width: 820px) {
  .landing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .topbar,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .language-switcher {
    width: 100%;
  }

  .language-option {
    flex: 1;
  }

  .hero,
  .workspace,
  .info-grid {
    grid-template-columns: 1fr;
  }

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

  .hero {
    min-height: auto;
  }

  .hero-meter {
    min-height: 240px;
  }
}

@media (max-width: 520px) {
  main {
    width: min(100% - 22px, 1160px);
  }

  .nav {
    width: 100%;
    justify-content: space-between;
  }

  h1 {
    font-size: 34px;
  }

  .quality-row,
  .trim-grid,
  .file-details div {
    grid-template-columns: 1fr;
  }

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

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

  .actions {
    display: grid;
  }

  button,
  .download-link {
    width: 100%;
  }
}