/* ============================================
   KLEF DESIGN SYSTEM V2
   Variable-Driven CSS Architecture
   Apple-Inspired Design Language
   ============================================ */

/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  /* === Core Colors === */
  --k-black: #22323a;

  /* === Primary Colors === */
  --blue: #0071e3; /* contraste AA sobre blanco */
  --blue-hover: #0077ed;
  --blue-rgb: 0, 113, 227;
  --blue-hsl: 211 100% 45%;
  --blue-light: rgba(0, 113, 227, 0.1);

  --orange: #e68600;
  --orange-hover: #d97f00;
  --orange-rgb: 230, 134, 0;
  --orange-hsl: 38 100% 45%;
  --orange-light: rgba(230, 134, 0, 0.12);

  /* === Secondary Colors (Klef Dev Identity) === */
  --green: #1e6f36;
  --green-hover: #195f2e;
  --green-rgb: 30, 111, 54;
  --green-hsl: 145 57% 28%;
  --green-light: rgba(30, 111, 54, 0.12);

  --pink: #c91042;
  --pink-hover: #b80e3c;
  --pink-rgb: 201, 16, 66;
  --pink-hsl: 348 85% 43%;
  --pink-light: rgba(201, 16, 66, 0.1);

  --purple: #8b3fc7;
  --purple-hover: #7d38b3;
  --purple-rgb: 139, 63, 199;
  --purple-hsl: 272 54% 51%;
  --purple-light: rgba(139, 63, 199, 0.1);

  /* === Tertiary Colors === */
  --red: #d12d20;
  --red-hover: #bc281c;
  --red-rgb: 209, 45, 32;
  --red-hsl: 5 73% 47%;
  --red-light: rgba(209, 45, 32, 0.1);

  /* === Gray Scale === */
  --gray-100: #f5f6f7;
  --gray-200: #e5e7ea;
  --gray-300: #cfd4d8;
  --gray-400: #b0b5ba;
  --gray-500: #8e8e93;
  --gray-600: #6e6e73;
  --gray-700: #424245;
  --gray-800: #22323a;
  --gray-900: #1d1d1f;

  --white: #ffffff;
  --black: #000000;

  /* === New Colors === */
  --gray-1: #f5f5f2;

  /* === Semantic Colors === */
  --text-primary: var(--k-black);
  --text-secondary: var(--gray-600);
  --text-tertiary: var(--gray-500);
  --text-inverse: var(--white);

  --bg-primary: var(--white);
  --bg-secondary: var(--gray-100);
  --bg-tertiary: var(--gray-200);

  --border-light: rgba(0, 0, 0, 0.06);
  --border-medium: rgba(0, 0, 0, 0.1);
  --border-strong: rgba(0, 0, 0, 0.2);

  /* === Typography === */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
    Roboto, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Courier New", monospace;

  /* Base: 17px */
  --fs-xs: 0.7647rem; /* 13px */
  --fs-sm: 0.8235rem; /* 14px */
  --fs-base: 1rem; /* 17px */
  --fs-md: 1.0588rem; /* 18px */
  --fs-lg: 1.1765rem; /* 20px */
  --fs-xl: 1.4118rem; /* 24px */
  --fs-2xl: 1.6471rem; /* 28px */
  --fs-3xl: 1.8824rem; /* 32px */
  --fs-4xl: 2.3529rem; /* 40px */
  --fs-5xl: 2.8235rem; /* 48px */
  --fs-6xl: 3.2941rem; /* 56px */
  --fs-7xl: 3.7647rem; /* 64px */
  --fs-8xl: 4.7059rem; /* 80px */

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  --lh-tight: 1.05;
  --lh-snug: 1.2;
  --lh-normal: 1.47059;
  --lh-relaxed: 1.6;
  --lh-loose: 1.8;

  --ls-tighter: -0.022em;
  --ls-tight: -0.015em;
  --ls-normal: 0;
  --ls-wide: 0.01em;
  --ls-wider: 0.08em;

  /* === Spacing Scale === */
  --sp-0: 0;
  --sp-1: 0.25rem; /* 4px */
  --sp-2: 0.5rem; /* 8px */
  --sp-3: 0.75rem; /* 12px */
  --sp-4: 1rem; /* 16px */
  --sp-5: 1.5rem; /* 24px */
  --sp-6: 2rem; /* 32px */
  --sp-7: 3rem; /* 48px */
  --sp-8: 4rem; /* 64px */
  --sp-9: 6rem; /* 96px */
  --sp-10: 8rem; /* 128px */

  /* === Border Radius === */
  --radius-xs: 4px;
  --radius-sm: 16px; /* Apple standard */
  --radius-md: 18px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* === Shadows === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05), 0 4px 6px rgba(0, 0, 0, 0.02);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.06), 0 10px 10px rgba(0, 0, 0, 0.02);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.12);
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.06);

  /* === Timing & Easing === */
  --ease-in-out: cubic-bezier(0.42, 0, 0.58, 1);
  --ease-out: ease-out;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);

  --duration-fast: 0.15s;
  --duration-base: 0.2s;
  --duration-slow: 0.3s;
  --duration-slower: 0.5s;

  /* === Z-Index === */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

/* ============================================
   BASE STYLES
   ============================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-system);
  font-size: 1rem;
  font-weight: var(--fw-regular);
  line-height: var(--lh-relaxed);
  color: var(--text-primary);
  background: var(--bg-primary);
}

/* ============================================
   VARIABLE ENGINE
   Declarative styles via inline CSS variables
   ============================================ */

/* === 1. VISIBILITY === */
[style*="--hidden"] {
  display: none !important;
}

[style*="--overflow:"] {
  overflow: var(--overflow);
}

[style*="--opacity:"] {
  opacity: var(--opacity);
}

/* === 2. INTERACTION === */
[style*="--cursor:"] {
  cursor: var(--cursor);
}

[style*="--pe:"] {
  pointer-events: var(--pe);
}

[style*="--select:"] {
  user-select: var(--select);
}

/* === 3. LAYOUT === */
[style*="--d:"] {
  display: var(--d);
}

[style*="--pos:"] {
  position: var(--pos);
}

[style*="--z:"] {
  z-index: var(--z);
}

[style*="--top:"] {
  top: var(--top);
}

[style*="--right:"] {
  right: var(--right);
}

[style*="--bottom:"] {
  bottom: var(--bottom);
}

[style*="--left:"] {
  left: var(--left);
}

[style*="--inset:"] {
  inset: var(--inset);
}

/* === 4. SIZING === */
[style*="--w:"] {
  width: var(--w);
}

[style*="--h:"] {
  height: var(--h);
}

[style*="--min-w:"] {
  min-width: var(--min-w);
}

[style*="--min-h:"] {
  min-height: var(--min-h);
}

[style*="--max-w:"] {
  max-width: var(--max-w);
}

[style*="--max-h:"] {
  max-height: var(--max-h);
}

[style*="--w-fill"] {
  width: stretch;
  width: -webkit-fill-available;
  width: -moz-available;
}

[style*="--h-fill"] {
  height: stretch;
  height: -webkit-fill-available;
  height: -moz-available;
}

/* === 5. SPACING === */
[style*="--p:"] {
  padding: var(--p);
}

[style*="--px:"] {
  padding-inline: var(--px);
}

[style*="--py:"] {
  padding-block: var(--py);
}

[style*="--pt:"] {
  padding-top: var(--pt);
}

[style*="--pr:"] {
  padding-right: var(--pr);
}

[style*="--pb:"] {
  padding-bottom: var(--pb);
}

[style*="--pl:"] {
  padding-left: var(--pl);
}

[style*="--m:"] {
  margin: var(--m);
}

[style*="--mx:"] {
  margin-inline: var(--mx);
}

[style*="--my:"] {
  margin-block: var(--my);
}

[style*="--mt:"] {
  margin-top: var(--mt);
}

[style*="--mr:"] {
  margin-right: var(--mr);
}

[style*="--mb:"] {
  margin-bottom: var(--mb);
}

[style*="--ml:"] {
  margin-left: var(--ml);
}

[style*="--gap:"] {
  gap: var(--gap);
}

/* === 6. SHAPE === */
[style*="--br:"] {
  border-radius: var(--br);
}

[style*="--brtl:"] {
  border-top-left-radius: var(--brtl);
}

[style*="--brtr:"] {
  border-top-right-radius: var(--brtr);
}

[style*="--brbl:"] {
  border-bottom-left-radius: var(--brbl);
}

[style*="--brbr:"] {
  border-bottom-right-radius: var(--brbr);
}

/* === 7. BORDERS === */
[style*="--b:"] {
  border: var(--b);
}

[style*="--bt:"] {
  border-top: var(--bt);
}

[style*="--br-border:"] {
  border-right: var(--br-border);
}

[style*="--bb:"] {
  border-bottom: var(--bb);
}

[style*="--bl:"] {
  border-left: var(--bl);
}

[style*="--bc:"] {
  border-color: var(--bc);
}

/* === 8. COLOR === */
[style*="--bg:"] {
  background: var(--bg);
}

[style*="--c:"] {
  color: var(--c);
}

/* === 9. EFFECTS === */
[style*="--blur:"] {
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
}

[style*="--shadow:"] {
  box-shadow: var(--shadow);
}

[style*="--filter:"] {
  filter: var(--filter);
}

/* === 10. TRANSFORMS === */
[style*="--transform:"] {
  transform: var(--transform);
}

[style*="--rotate:"] {
  transform: rotate(var(--rotate));
}

[style*="--scale:"] {
  transform: scale(var(--scale));
}

[style*="--translate:"] {
  transform: translate(var(--translate));
}

/* === 11. TRANSITIONS === */
[style*="--transition:"] {
  transition: var(--transition);
}

/* === 12. FLEXBOX === */
[style*="--flex"] {
  display: flex;
}

[style*="--flex-col"] {
  display: flex;
  flex-direction: column;
}

[style*="--flex-wrap"] {
  flex-wrap: wrap;
}

[style*="--items:"] {
  align-items: var(--items);
}

[style*="--justify:"] {
  justify-content: var(--justify);
}

[style*="--content:"] {
  align-content: var(--content);
}

[style*="--self:"] {
  align-self: var(--self);
}

[style*="--flex-grow:"] {
  flex-grow: var(--flex-grow);
}

[style*="--flex-shrink:"] {
  flex-shrink: var(--flex-shrink);
}

[style*="--flex-basis:"] {
  flex-basis: var(--flex-basis);
}

/* === 13. GRID === */
[style*="--grid"] {
  display: grid;
}

[style*="--cols:"] {
  grid-template-columns: var(--cols);
}

[style*="--rows:"] {
  grid-template-rows: var(--rows);
}

[style*="--col-span:"] {
  grid-column: span var(--col-span);
}

[style*="--row-span:"] {
  grid-row: span var(--row-span);
}

[style*="--place:"] {
  place-items: var(--place);
}

/* === 14. TYPOGRAPHY === */
[style*="--fs:"] {
  font-size: var(--fs);
}

[style*="--fw:"] {
  font-weight: var(--fw);
}

[style*="--lh:"] {
  line-height: var(--lh);
}

[style*="--ls:"] {
  letter-spacing: var(--ls);
}

[style*="--ta:"] {
  text-align: var(--ta);
}

[style*="--td:"] {
  text-decoration: var(--td);
}

[style*="--tt:"] {
  text-transform: var(--tt);
}

[style*="--ws:"] {
  white-space: var(--ws);
}

/* ============================================
   COMPONENT CLASSES (Optional)
   Components use classes for intention,
   variables for behavior
   ============================================ */

/* === CONTAINER === */
.container {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

.container-sm {
  max-width: 640px;
}
.container-md {
  max-width: 768px;
}
.container-lg {
  max-width: 1024px;
}
.container-xl {
  max-width: 1280px;
}

/* === SECTION === */
.section {
  padding-block: var(--sp-8);
}

.section-sm {
  padding-block: var(--sp-6);
}
.section-lg {
  padding-block: var(--sp-9);
}
.section-xl {
  padding-block: var(--sp-10);
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 12px 22px;
  font-family: inherit;
  font-size: var(--fs-lg);
  font-weight: var(--fw-regular);
  line-height: 1.17648;
  letter-spacing: var(--ls-tighter);
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  white-space: nowrap;
  user-select: none;
  height: fit-content;
}

.btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
  background: var(--blue);
  color: var(--white);
}

.btn-primary:hover:not(:disabled) {
  background: var(--blue-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--blue);
  border: 1px solid var(--blue);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--blue);
  color: var(--white);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-secondary);
}

/* Button Sizes */
.btn-sm {
  padding: 8px 16px;
  font-size: var(--fs-base);
}

.btn-lg {
  padding: 16px 28px;
  font-size: var(--fs-xl);
}

/* === CARDS === */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: all var(--duration-slow) var(--ease-out);
}

.card.shady {
  box-shadow: var(--shadow-soft);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--border-medium);
}

.card-interactive {
  cursor: pointer;
}

.card-content {
  padding: var(--sp-5);
}

.card-title {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
  line-height: 1.16667;
  color: var(--text-primary);
  margin-bottom: var(--sp-2);
}

.card-description {
  font-size: var(--fs-lg);
  line-height: var(--lh-normal);
  color: var(--text-secondary);
}

/* === FORMS === */
.form-group {
  margin-bottom: var(--sp-5);
}

.form-label {
  display: block;
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  margin-bottom: var(--sp-2);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  font-family: inherit;
  font-size: var(--fs-lg);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  transition: all var(--duration-base) ease;
  outline: none;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2386868b' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px var(--blue-light);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* === BADGES === */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 4px 10px;
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  line-height: 1;
  white-space: nowrap;
}

.badge-blue {
  background: var(--blue-light);
  color: var(--blue);
}
.badge-green {
  background: var(--green-light);
  color: var(--green);
}
.badge-orange {
  background: var(--orange-light);
  color: var(--orange);
}
.badge-red {
  background: var(--red-light);
  color: var(--red);
}
.badge-purple {
  background: var(--purple-light);
  color: var(--purple);
}
.badge-pink {
  background: var(--pink-light);
  color: var(--pink);
}

/* === NAVIGATION === */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: background var(--duration-base) ease;
}

.nav-content {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}

.nav-logo {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: opacity var(--duration-fast) ease;
}

.nav-logo:hover {
  opacity: 0.7;
}

.nav-links {
  display: flex;
  gap: var(--sp-6);
  list-style: none;
  align-items: center;
}

.nav-link {
  font-size: var(--fs-md);
  color: var(--text-primary);
  text-decoration: none;
  opacity: 0.8;
  transition: opacity var(--duration-fast) ease;
  position: relative;
}

.nav-link:hover {
  opacity: 1;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -7px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--blue);
  transition: width var(--duration-base) var(--ease-out);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ============================================
   TYPOGRAPHY UTILITIES
   ============================================ */
.display-xl {
  font-size: var(--fs-8xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
}

.display-lg {
  font-size: var(--fs-7xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
}

.display-md {
  font-size: var(--fs-6xl);
  font-weight: var(--fw-semibold);
  line-height: 1.0625;
  letter-spacing: -0.009em;
}

.headline-xl {
  font-size: var(--fs-5xl);
  font-weight: var(--fw-semibold);
  line-height: 1.1;
}

.headline-lg {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-semibold);
  line-height: 1.125;
}

.headline-md {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-semibold);
  line-height: 1.14286;
}

.body-lg {
  font-size: var(--fs-lg);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
}

.body-md {
  font-size: var(--fs-md);
  font-weight: var(--fw-regular);
  line-height: 1.5;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-fade-in {
  animation: fadeIn var(--duration-slow) var(--ease-expo) backwards;
}

.animate-slide-up {
  animation: slideUp var(--duration-slow) var(--ease-expo) backwards;
}

.animate-scale-in {
  animation: scaleIn var(--duration-slow) var(--ease-expo) backwards;
}

/* Animation Delays */
.delay-1 {
  animation-delay: 0.1s;
}
.delay-2 {
  animation-delay: 0.2s;
}
.delay-3 {
  animation-delay: 0.3s;
}
.delay-4 {
  animation-delay: 0.4s;
}
.delay-5 {
  animation-delay: 0.5s;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --sp-5: 1rem;
    --sp-6: 1.5rem;
    --sp-7: 2rem;
    --sp-8: 2.5rem;
  }

  .display-xl {
    font-size: var(--fs-6xl);
  }
  .display-lg {
    font-size: var(--fs-5xl);
  }
  .display-md {
    font-size: var(--fs-4xl);
  }

  .headline-xl {
    font-size: var(--fs-4xl);
  }
  .headline-lg {
    font-size: var(--fs-3xl);
  }

  .container {
    padding-inline: var(--sp-4);
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
*:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

@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;
  }
}

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

/* ============================================
   USAGE EXAMPLES
   ============================================ */

/*
  VARIABLE-DRIVEN APPROACH:
  
  Traditional:
  <div class="flex items-center justify-between p-5 bg-gray-100 rounded-lg">
  
  New (Klef v2):
  <div style="--flex; --items:center; --justify:space-between; --p:var(--sp-5); --bg:var(--bg-secondary); --br:var(--radius-lg)">
  
  ────────────────────────────────────────
  
  CARD EXAMPLE:
  
  <div class="card" style="--p:var(--sp-6); --bg:var(--bg-primary); --br:var(--radius-lg)">
    <h3 style="--fs:var(--fs-2xl); --fw:var(--fw-semibold); --mb:var(--sp-2)">
      Card Title
    </h3>
    <p style="--c:var(--text-secondary); --lh:var(--lh-relaxed)">
      Description text here
    </p>
  </div>
  
  ────────────────────────────────────────
  
  HERO SECTION:
  
  <section style="--py:var(--sp-10); --ta:center">
    <div class="container">
      <span style="--d:inline-flex; --items:center; --gap:var(--sp-2); --bg:var(--blue-light); --c:var(--blue); --py:var(--sp-2); --px:var(--sp-4); --br:var(--radius-full); --fs:var(--fs-sm); --fw:var(--fw-medium)">
        ✨ New Feature
      </span>
      
      <h1 class="display-xl animate-fade-in delay-1" style="--mt:var(--sp-5); --mb:var(--sp-4)">
        Build Better Interfaces
      </h1>
      
      <p class="body-lg animate-fade-in delay-2" style="--c:var(--text-secondary); --max-w:600px; --mx:auto; --mb:var(--sp-6)">
        A modern, variable-driven CSS system inspired by Apple's design language.
      </p>
      
      <div class="animate-fade-in delay-3" style="--flex; --gap:var(--sp-3); --justify:center">
        <button class="btn btn-primary">Get Started</button>
        <button class="btn btn-secondary">Learn More</button>
      </div>
    </div>
  </section>
  
  ────────────────────────────────────────
  
  GRID LAYOUT:
  
  <div style="--grid; --cols:repeat(3, 1fr); --gap:var(--sp-5)">
    <div class="card">Card 1</div>
    <div class="card">Card 2</div>
    <div class="card">Card 3</div>
  </div>
  
  ────────────────────────────────────────
  
  RESPONSIVE FLEX:
  
  <div style="--flex; --flex-col; --gap:var(--sp-4); --items:stretch">
    <div style="--flex; --items:center; --justify:space-between; --p:var(--sp-4); --bg:var(--bg-secondary); --br:var(--radius-sm)">
      <span style="--fw:var(--fw-medium)">Setting Name</span>
      <span class="badge badge-blue">Active</span>
    </div>
  </div>
  
  ────────────────────────────────────────
  
  CUSTOM COMPONENT WITH VARIABLES:
  
  <div class="feature-card" style="--p:var(--sp-6); --bg:linear-gradient(135deg, var(--blue), var(--purple)); --br:var(--radius-xl); --shadow:var(--shadow-xl); --c:var(--white)">
    <div style="--flex; --items:center; --gap:var(--sp-3); --mb:var(--sp-4)">
      <div style="--w:48px; --h:48px; --bg:rgba(255,255,255,0.2); --br:var(--radius-md); --flex; --items:center; --justify:center">
        🚀
      </div>
      <h3 style="--fs:var(--fs-xl); --fw:var(--fw-semibold)">Fast Performance</h3>
    </div>
    <p style="--opacity:0.9; --lh:var(--lh-relaxed)">
      Lightning-fast rendering with optimized CSS variables.
    </p>
  </div>
*/

/* ============================================
   ADVANCED PATTERNS
   ============================================ */

/* === Modal Pattern === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-base) ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
  transform: scale(0.95) translateY(20px);
  transition: transform var(--duration-slow) var(--ease-expo);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: var(--sp-6);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: var(--sp-6);
  overflow-y: auto;
  max-height: calc(90vh - 140px);
}

.modal-footer {
  padding: var(--sp-6);
  border-top: 1px solid var(--border-light);
  display: flex;
  gap: var(--sp-3);
  justify-content: flex-end;
}

/* === Dropdown Pattern === */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-2);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--duration-base) var(--ease-out);
}

.dropdown.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--duration-fast) ease;
  text-decoration: none;
  color: var(--text-primary);
  font-size: var(--fs-base);
}

.dropdown-item:hover {
  background: var(--bg-secondary);
}

/* === Alert Pattern === */
.alert {
  padding: var(--sp-5);
  border-radius: var(--radius-md);
  display: flex;
  gap: var(--sp-3);
  border: 1px solid;
}

.alert-info {
  background: var(--blue-light);
  border-color: var(--blue);
  color: var(--blue);
}

.alert-success {
  background: var(--green-light);
  border-color: var(--green);
  color: var(--green);
}

.alert-warning {
  background: var(--orange-light);
  border-color: var(--orange);
  color: var(--orange);
}

.alert-error {
  background: var(--red-light);
  border-color: var(--red);
  color: var(--red);
}

/* === Progress Bar === */
.progress {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background: var(--blue);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-out);
}

.progress-bar-green {
  background: var(--green);
}
.progress-bar-orange {
  background: var(--orange);
}
.progress-bar-red {
  background: var(--red);
}

/* === Switch Toggle === */
.switch {
  position: relative;
  display: inline-block;
  width: 51px;
  height: 31px;
}

.switch-input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gray-300);
  border-radius: var(--radius-full);
  transition: background var(--duration-base);
}

.switch-slider::before {
  content: "";
  position: absolute;
  height: 27px;
  width: 27px;
  left: 2px;
  bottom: 2px;
  background: var(--white);
  border-radius: 50%;
  transition: transform var(--duration-base);
  box-shadow: var(--shadow-sm);
}

.switch-input:checked + .switch-slider {
  background: var(--green);
}

.switch-input:checked + .switch-slider::before {
  transform: translateX(20px);
}

/* === Tabs === */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-light);
}

.tab {
  padding: var(--sp-4) var(--sp-5);
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all var(--duration-fast) ease;
}

.tab:hover {
  color: var(--text-primary);
}

.tab.active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

/* === Accordion === */
.accordion {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--border-light);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  width: 100%;
  padding: var(--sp-4) var(--sp-5);
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--fs-lg);
  font-weight: var(--fw-medium);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--duration-fast);
}

.accordion-header:hover {
  background: var(--bg-secondary);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slower) var(--ease-out);
}

.accordion-content-inner {
  padding: var(--sp-4) var(--sp-5);
  color: var(--text-secondary);
}

.accordion-item.active .accordion-content {
  max-height: 500px;
}

/* === Spinner/Loading === */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-light);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.spinner-lg {
  width: 60px;
  height: 60px;
  border-width: 4px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   UTILITY CLASSES (Minimal, Intentional)
   ============================================ */

/* Display */
.hidden {
  display: none !important;
}
.block {
  display: block;
}
.inline-block {
  display: inline-block;
}

/* Text */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

/* Colors */
.text-primary {
  color: var(--text-primary);
}
.text-secondary {
  color: var(--text-secondary);
}
.text-tertiary {
  color: var(--text-tertiary);
}

/* Spacing shortcuts */
.m-auto {
  margin: auto;
}
.mx-auto {
  margin-inline: auto;
}

/* ============================================
   BENTO GRID SYSTEM (Modern Layout)
   ============================================ */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(140px, auto);
  gap: 1rem;
}

.bento-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--duration-base) ease,
    box-shadow var(--duration-base) ease;
}

.bento-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.bento-hero {
  grid-column: span 2;
  grid-row: span 2;
}

.bento-wide {
  grid-column: span 2;
  grid-row: span 1;
}

.bento-tall {
  grid-column: span 1;
  grid-row: span 2;
}

.bento-square {
  grid-column: span 1;
  grid-row: span 1;
}

.bento-full {
  grid-column: span 4;
  grid-row: span 1;
}

@media (max-width: 768px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .bento-hero,
  .bento-wide,
  .bento-full {
    grid-column: span 2;
  }

  .bento-tall {
    grid-row: span 1;
  }
}

@media (max-width: 480px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }

  .bento-hero,
  .bento-wide,
  .bento-tall,
  .bento-square,
  .bento-full {
    grid-column: span 1;
    grid-row: span 1;
  }
}

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */

/* GPU acceleration */
.card,
.btn,
.modal,
.dropdown-menu {
  will-change: transform;
  transform: translateZ(0);
}

/* Prevent layout shift */
img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .nav,
  .btn,
  .modal-overlay,
  .dropdown {
    display: none !important;
  }

  .card {
    break-inside: avoid;
  }

  * {
    box-shadow: none !important;
  }
}

/* ============================================
   DARK MODE SUPPORT (Optional)
   ============================================ */
@media (prefers-color-scheme: dark) {
  /*
  Uncomment to enable dark mode:
  
  :root {
    --k-black: #ffffff;
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --text-tertiary: #6e6e73;
    
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #2d2d2f;
    
    --border-light: rgba(255, 255, 255, 0.1);
    --border-medium: rgba(255, 255, 255, 0.2);
    --border-strong: rgba(255, 255, 255, 0.3);
    
    --gray-100: #1d1d1f;
    --gray-200: #2d2d2f;
  }
  
  .nav {
    background: rgba(0, 0, 0, 0.8);
  }
  */
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */
@media (prefers-contrast: high) {
  :root {
    --border-light: rgba(0, 0, 0, 0.3);
    --border-medium: rgba(0, 0, 0, 0.5);
  }

  .btn,
  .card,
  .form-input {
    border-width: 2px;
  }
}

/* ============================================
   FOR SHOW CODE EASY
   ============================================ */

@font-face {
  font-family: "Monaspace";
  src: url("/assets/fonts/MonaspaceKrypton-SyntaxHighlighter-Regular.woff2")
    format("woff2");
}

/* ============ KUNG FURY (Original) ============ */
@font-palette-values --kung-fury {
  font-family: "Monaspace";
  override-colors: 0 hsl(225 100% 40%),
    /* curlies and tags */ 1 hsl(250 100% 80%), /* ? */ 2 hsl(225 100% 40%),
    /* function */ 3 hsl(225 100% 40%), /* ? */ 4 hsl(270 50% 40%),
    /* () */ 5 hsl(210 40% 2%), /* property name */ 6 hsl(210 10% 30%),
    /* ? */ 7 hsl(327 100% 54%) /* numbers */;
}

/* ============ SOLARIZED ============ */
@font-palette-values --solarized {
  font-family: "Monaspace";
  override-colors: 0 hsl(205 69% 49%),
    /* curlies and tags - blue */ 1 hsl(68 100% 30%),
    /* ? - green */ 2 hsl(205 69% 49%), /* function */ 3 hsl(205 69% 49%),
    /* ? */ 4 hsl(175 59% 40%), /* () - cyan */ 5 hsl(192 81% 14%),
    /* property name - dark */ 6 hsl(192 81% 24%),
    /* ? */ 7 hsl(1 79% 55%) /* numbers - red */;
}

code,
.code {
  font-family: "Monaspace", sans-serif !important;
  background-color: #000000;
  color: white;
  border: solid;
}

pre {
  min-width: 0;
  overflow-x: auto;
  padding: 2ch;
}

/* Para aplicar un esquema específico */
.theme-nord.code {
  font-palette: --nord;
}

.theme-solarized.code {
  font-palette: --solarized;
}

/* ============================================
   CONCLUSION & PHILOSOPHY
   ============================================ */

/*
  ╔════════════════════════════════════════════════════════════╗
  ║  KLEF DESIGN SYSTEM V2 - VARIABLE-DRIVEN ARCHITECTURE     ║
  ╚════════════════════════════════════════════════════════════╝
  
  CORE PRINCIPLES:
  ───────────────
  1. Declarative over Imperative
     → HTML describes WHAT, not HOW
  
  2. Variables over Classes
     → Behavior through CSS variables
     → Intention through semantic classes
  
  3. Token-First Design
     → All values from design tokens
     → Consistent, scalable system
  
  4. Progressive Enhancement
     → Works without JavaScript
     → Enhanced with JavaScript
  
  5. Composable Architecture
     → Variables combine freely
     → No naming conflicts
  
  WHEN TO USE:
  ────────────
  ✓ Design systems
  ✓ Component libraries
  ✓ CMS/UI builders
  ✓ Large-scale applications
  ✓ JSON-driven interfaces
  ✓ Apple-inspired designs
  
  THE MANTRA:
  ───────────
  "Classes define intention.
   Variables define behavior."
  
  EXAMPLE WORKFLOW:
  ─────────────────
  1. Define tokens (colors, spacing, radius)
  2. Use variables inline for behavior
  3. Use classes for semantic components
  4. Compose freely without limits
  
  This system empowers developers to build
  modern, scalable, and maintainable interfaces
  with the elegance of Apple's design language.
  
  Version: 2.0.0
  License: MIT
  Author: Klef Design Team
  Updated: 2025
*/