:root {
  color-scheme: light dark;
}

:where([hidden]) {
  display: none !important;
}

:root {
  --font-family-latin: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-ko: "Pretendard Variable", "Pretendard", system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", "맑은 고딕", "Noto Sans KR", sans-serif;

  --color-primary: #4A6C8C;
  --color-primary-dark: #3A556E;
  --color-primary-light: #E4ECF3;
  --color-primary-lighter: #F3F7FA;
  --color-accent: #E57373;
  --color-accent-dark: #D32F2F;
  --color-accent-light: #FFF0F0;

  --color-success: #4A9C68;
  --color-success-bg: #E8F5E9;
  --color-warning: #FFBF69;
  --color-warning-bg: #FFF8E1;
  --color-danger: #D65A5A;
  --color-danger-bg: #FEEEEE;

  --color-background: #FDFBF8;
  --color-surface: #FFFFFF;
  --color-border: #D0D4D9;
  --color-border-light: #F2F2F2;
  --color-warm-beige: #F9F6F2;
  --surface-raised: #FFFFFF;
  --surface-soft-blue: #F4F8FC;
  --surface-warm: #FFFDF9;

  --color-text: #2A2A2A;
  --color-text-dark: #1A1A1A;
  --color-text-light: #5A626A;
  --color-text-lighter: #A1A1A1;
  --color-text-on-primary: #FFFFFF;
  --color-text-on-accent: #FFFFFF;
  --color-text-on-accent-strong: #1A1A1A;
  
  --chart-color-1: var(--color-primary);
  --chart-color-2: #84A9C4;
  --chart-color-3: var(--color-accent);
  --chart-color-4: #B2C5E8;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2.25rem;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --line-height-base: 1.7;
  --line-height-heading: 1.35;
  --letter-spacing: 0;

  --space-xs: 0.5rem;
  --space-sm: 0.875rem;
  --space-md: 1.125rem;
  --space-lg: 1.5rem;
  --space-xl: 1.875rem;
  --space-xxl: 2.5rem;
  --space-section: 4.375rem;

  --border-radius-sm: 0.5rem;
  --border-radius-base: 0.5rem;
  --border-radius-lg: 0.625rem;
  --border-radius-pill: 3.125rem;
  --border-radius-circle: 50%;

  --shadow-color-rgb: 58, 91, 138;
  --shadow-soft: 0 1px 6px rgba(var(--shadow-color-rgb), 0.06);
  --shadow-medium: 0 3px 12px rgba(var(--shadow-color-rgb), 0.08);
  --shadow-strong: 0 7px 20px rgba(var(--shadow-color-rgb), 0.09);
  --shadow-large: 0 10px 26px rgba(var(--shadow-color-rgb), 0.1);
  --button-shadow: 0 0.35rem 0.9rem rgba(var(--shadow-color-rgb), 0.13);
  --button-shadow-hover: 0 0.55rem 1.2rem rgba(var(--shadow-color-rgb), 0.18);
  --choice-shadow: 0 0.25rem 0.85rem rgba(var(--shadow-color-rgb), 0.09);
  --choice-selected-shadow: 0 0 0 2px rgba(74, 108, 140, 0.16), 0 0.45rem 1rem rgba(var(--shadow-color-rgb), 0.12);

  --ui-card-radius: var(--border-radius-base);
  --ui-panel-radius: var(--border-radius-lg);
  --ui-control-radius: var(--border-radius-sm);
  --ui-border-subtle: 1px solid var(--color-border-light);
  --ui-border-strong: 1px solid var(--color-border);
  --ui-surface-muted: var(--color-primary-lighter);
  --ui-shadow-rest: var(--shadow-soft);
  --ui-shadow-hover: var(--shadow-medium);
  --ui-highlight-shadow: 0 0 0 3px rgba(var(--shadow-color-rgb), 0.12);

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.2, 0, 0, 1);

  --width-max-container: 75rem;
  --width-tool-container: 48rem;
  --width-max-content: 75rem;
  --header-height: 4.0625rem;

  --z-sticky: 900;
  --z-header: 1000;
  --z-menu: 1100;
  --z-fab: 1150;
  --z-tooltip: 1200;
  --z-modal: 1300;
  --z-toast: 1400;

  --focus-ring-color: color-mix(in srgb, var(--color-primary) 70%, white);
  --focus-ring: 0 0 0 3px var(--focus-ring-color);
  --state-hover: .96;
  --state-active: .92;
  --state-disabled: .48;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0E1113;
    --color-surface: #15191C;
    --color-text: #E6E6E6;
    --color-text-dark: #FFFFFF;
    --color-text-light: #B9B9B9;
    --color-border: #3A3A3A;
    --color-border-light: #2A2F34;
    --color-primary: #7DA2C8;
    --color-primary-dark: #A8BED8;
    --color-primary-light: #2A3B4F;
    --color-primary-lighter: #1E2A3A;
    --color-success-bg: #1D2C22;
    --color-warning-bg: #332A17;
    --color-danger-bg: #33201F;
    --surface-raised: #15191C;
    --surface-soft-blue: #1E2A3A;
    --surface-warm: #191715;
    --color-warm-beige: #191715;
    --shadow-color-rgb: 0, 0, 0;
    --shadow-soft: 0 1px 6px rgba(var(--shadow-color-rgb), 0.34);
    --shadow-medium: 0 3px 12px rgba(var(--shadow-color-rgb), 0.36);
    --shadow-strong: 0 7px 20px rgba(var(--shadow-color-rgb), 0.38);
    --shadow-large: 0 10px 26px rgba(var(--shadow-color-rgb), 0.4);
    --button-shadow: 0 0.35rem 0.9rem rgba(var(--shadow-color-rgb), 0.42);
    --button-shadow-hover: 0 0.55rem 1.2rem rgba(var(--shadow-color-rgb), 0.5);
    --choice-shadow: 0 0.25rem 0.85rem rgba(var(--shadow-color-rgb), 0.36);
    --choice-selected-shadow: 0 0 0 2px rgba(125, 162, 200, 0.24), 0 0.45rem 1rem rgba(var(--shadow-color-rgb), 0.4);
    --chart-color-1: var(--color-primary);
    --chart-color-2: #5E85B0;
    --chart-color-3: #D98C82;
    --chart-color-4: #4E6A94;
  }
}

::selection {
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
}

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

html {
  font-size: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height, 4.0625rem) + 1rem);
  overflow-y: scroll;
  scrollbar-gutter: stable;
  font-family: var(--font-family-latin);
}

body {
  min-height: 100vh;
  display: flex; 
  flex-direction: column;
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.025'/%3E%3C/svg%3E");
  letter-spacing: var(--letter-spacing);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

body:lang(ko) { 
  font-family: var(--font-family-ko); 
}

:lang(en), :lang(es), :lang(de), :lang(fr), :lang(pt) {
  hyphens: auto;
  word-break: normal;
}

main { 
  flex-grow: 1; 
}

img, svg, video, canvas, audio, iframe { 
  display: block; 
  max-width: 100%; 
  height: auto; 
}

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

button { 
  font: inherit; 
  color: inherit; 
  background: transparent; 
  border: 0; 
  padding: 0; 
  cursor: pointer; 
}

ul, ol { 
  list-style: none; 
}

input, select, textarea { 
  font: inherit; 
  color: inherit; 
  background: transparent; 
  border-radius: var(--border-radius-sm); 
  border: 1px solid var(--color-border); 
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-heading);
  color: var(--color-text-dark);
  letter-spacing: var(--letter-spacing);
  text-wrap: balance;
}
h1 { font-size: var(--font-size-xl); font-weight: var(--font-weight-extrabold); }
h2 { font-size: var(--font-size-lg); font-weight: var(--font-weight-bold); }
h3 { font-size: var(--font-size-md); font-weight: var(--font-weight-semibold); }
p { margin-bottom: var(--space-lg); }
p:last-child { margin-bottom: 0; }
.with-sticky-header { padding-top: var(--header-height); }

.skip-to-content-link {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; 
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-to-content-link:focus, 
.skip-to-content-link:active {
  position: fixed; top: .5rem; left: .5rem; width: auto; height: auto; 
  overflow: visible; z-index: 9999;
  padding: .5rem .75rem; background: var(--color-surface); 
  border: 2px solid var(--color-primary-dark); border-radius: .5rem;
  font-weight: var(--font-weight-semibold); box-shadow: var(--shadow-strong);
}

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

:is(a, button, input, select, textarea, details, summary, [tabindex]:not([tabindex="-1"])),
[role="button"] { 
  outline: none; 
}
:where(a, button, [role="button"], input, select, textarea, summary, [tabindex]:not([tabindex="-1"])):focus-visible {
  outline: .125rem solid var(--focus-ring-color);
  outline-offset: .125rem;
  border-radius: .25rem;
}
:where(a,button,[role="button"]):active { 
  transform: translateY(1px); 
  filter: brightness(var(--state-active)); 
}
:where(a[aria-disabled="true"],button:disabled) { 
  opacity: var(--state-disabled); 
  pointer-events: none; 
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .sub-menu, .tooltip, .toast-message,
  .card:hover, .tool-card-item a:hover,
  .mobile-tool-item-style:hover, .mobile-sub-link:hover {
    transform: none !important;
  }
  .mobile-nav-overlay {
    backdrop-filter: none !important;
    background-color: rgba(0, 0, 0, 0.6) !important;
  }
}

@media (forced-colors: active) {
  * { forced-color-adjust:auto !important; }
  .btn, .nav-link, .sub-menu, .card, .tooltip, .pill, .core-tool-card, .header, .site-footer, details, input, .sticky-header {
    border: 1px solid CanvasText !important;
    background: Canvas !important;
    color: CanvasText !important;
    box-shadow: none !important;
  }
  .btn-primary { 
    background: Highlight !important; 
    color: HighlightText !important; 
    border-color: Highlight !important; 
  }
}

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--color-background);
  border-left: 1px solid var(--color-border-light);
}
::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--border-radius-pill);
  border: 2px solid var(--color-background);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}
.prose {
  max-width: 42rem; 
  margin-left: auto;
  margin-right: auto;
}