/* LUFLY Design System - Tidal Monolith (Direction 01 / 10) */
/* Single source of truth for color, type, space and motion. */

/* ============================================================
   01 - Brand palette (fixed, never themed)
   ============================================================ */

:root {
  /* LUFLY Teal ramp - primary signature #1C8B8B */
  --lu-teal-50: #e6f4f4;
  --lu-teal-100: #c9e8e8;
  --lu-teal-200: #9ad6d6;
  --lu-teal-300: #63bebe;
  --lu-teal-400: #35a3a3;
  --lu-teal-500: #1c8b8b;
  --lu-teal-600: #147174;
  --lu-teal-700: #10585c;
  --lu-teal-800: #0c4347;
  --lu-teal-900: #082e32;

  /* Deep teal - secondary personality */
  --lu-deep-teal: #143f43;
  --lu-mint: #7fe2d0;

  /* Ink ramp - dark mode surfaces (warm neutral charcoal, low-glare) */
  --lu-ink-950: #141311;
  --lu-ink-900: #2c2b28;
  --lu-ink-800: #353430;
  --lu-ink-700: #3f3d38;
  --lu-ink-600: #57544b;
  --lu-ink-500: #aba79b;
  --lu-ink-100: #e9e6de;

  /* Neutral ramp */
  --lu-neutral-0: #ffffff;
  --lu-neutral-50: #f3f7f5;
  --lu-neutral-100: #e9f1ee;
  --lu-neutral-200: #d3deda;
  --lu-neutral-300: #b3c4bf;
  --lu-neutral-400: #8aa09a;
  --lu-neutral-500: #617674;
  --lu-neutral-600: #4f6360;
  --lu-neutral-700: #3a4a48;
  --lu-neutral-800: #24312f;
  --lu-neutral-900: #102a2a;

  /* Border reference */
  --lu-border-light: #c8d6d1;

  /* Semantic hues - light mode values */
  --lu-success: #4d9077;
  --lu-warning: #c58a32;
  --lu-danger: #c64b4b;
  --lu-info: #3b7a9a;

  /* Semantic hues - dark mode values */
  --lu-success-dark: #78ce9c;
  --lu-warning-dark: #e7b658;
  --lu-danger-dark: #f07b7b;
  --lu-info-dark: #8cc9ee;
}

/* ============================================================
   02 - Semantic tokens: Light Mode
   ============================================================ */

:root,
[data-theme="light"] {
  --ds-bg: var(--lu-neutral-50);
  --ds-surface: var(--lu-neutral-0);
  --ds-surface-alt: var(--lu-neutral-100);
  --ds-text: var(--lu-neutral-900);
  --ds-text-muted: var(--lu-neutral-500);
  --ds-border: var(--lu-border-light);

  --ds-primary: var(--lu-teal-500);
  --ds-primary-hover: var(--lu-teal-600);
  --ds-primary-text: var(--lu-neutral-0);
  --ds-primary-soft: color-mix(in srgb, var(--lu-teal-500) 10%, transparent);
  --ds-primary-tint: color-mix(in srgb, var(--lu-teal-500) 6%, transparent);
  --ds-primary-glow: color-mix(in srgb, var(--lu-teal-500) 25%, transparent);
  --ds-primary-line: color-mix(in srgb, var(--lu-teal-500) 30%, transparent);

  --ds-secondary: var(--lu-deep-teal);
  --ds-secondary-text: var(--lu-neutral-0);

  --ds-success: var(--lu-success);
  --ds-success-hover: color-mix(in srgb, var(--lu-success) 82%, var(--lu-neutral-900));
  --ds-success-soft: color-mix(in srgb, var(--lu-success) 14%, var(--ds-surface));
  --ds-warning: var(--lu-warning);
  --ds-warning-hover: color-mix(in srgb, var(--lu-warning) 82%, var(--lu-neutral-900));
  --ds-warning-soft: color-mix(in srgb, var(--lu-warning) 14%, var(--ds-surface));
  --ds-danger: var(--lu-danger);
  --ds-danger-hover: color-mix(in srgb, var(--lu-danger) 82%, var(--lu-neutral-900));
  --ds-danger-soft: color-mix(in srgb, var(--lu-danger) 12%, var(--ds-surface));
  --ds-info: var(--lu-info);
  --ds-info-soft: color-mix(in srgb, var(--lu-info) 12%, var(--ds-surface));

  --ds-glass-bg: color-mix(in srgb, var(--lu-neutral-0) 78%, transparent);
  --ds-glass-bg-strong: color-mix(in srgb, var(--lu-neutral-0) 92%, transparent);
  --ds-glass-border: color-mix(in srgb, var(--lu-border-light) 72%, transparent);
  --ds-glass-highlight: color-mix(in srgb, var(--lu-neutral-0) 40%, transparent);
  --ds-glass-blur: blur(24px) saturate(180%);

  --ds-scrim: color-mix(in srgb, var(--lu-ink-900) 55%, transparent);
  --ds-scrim-strong: color-mix(in srgb, var(--lu-ink-900) 78%, transparent);
  --ds-scrim-soft: color-mix(in srgb, var(--lu-ink-900) 12%, transparent);
  --ds-shadow-color: color-mix(in srgb, var(--lu-neutral-900) 10%, transparent);
  --ds-shadow-color-soft: color-mix(in srgb, var(--lu-neutral-900) 6%, transparent);
  --ds-shadow-color-strong: color-mix(in srgb, var(--lu-neutral-900) 18%, transparent);
  --ds-focus-color: color-mix(in srgb, var(--lu-teal-500) 35%, transparent);

  color-scheme: light;
}

/* ============================================================
   03 - Semantic tokens: Dark Mode
   ============================================================ */

[data-theme="dark"] {
  --ds-bg: var(--lu-ink-900);
  --ds-surface: var(--lu-ink-800);
  --ds-surface-alt: var(--lu-ink-700);
  --ds-text: var(--lu-ink-100);
  --ds-text-muted: var(--lu-ink-500);
  --ds-border: var(--lu-ink-600);

  --ds-primary: var(--lu-teal-500);
  --ds-primary-hover: var(--lu-mint);
  --ds-primary-text: var(--lu-ink-950);
  --ds-primary-soft: color-mix(in srgb, var(--lu-teal-500) 20%, transparent);
  --ds-primary-tint: color-mix(in srgb, var(--lu-mint) 5%, transparent);
  --ds-primary-glow: color-mix(in srgb, var(--lu-teal-500) 32%, transparent);
  --ds-primary-line: color-mix(in srgb, var(--lu-mint) 32%, transparent);

  --ds-secondary: var(--lu-mint);
  --ds-secondary-text: var(--lu-ink-950);

  --ds-success: var(--lu-success-dark);
  --ds-success-hover: color-mix(in srgb, var(--lu-success-dark) 82%, var(--lu-ink-900));
  --ds-success-soft: color-mix(in srgb, var(--lu-success-dark) 16%, var(--ds-surface));
  --ds-warning: var(--lu-warning-dark);
  --ds-warning-hover: color-mix(in srgb, var(--lu-warning-dark) 82%, var(--lu-ink-900));
  --ds-warning-soft: color-mix(in srgb, var(--lu-warning-dark) 16%, var(--ds-surface));
  --ds-danger: var(--lu-danger-dark);
  --ds-danger-hover: color-mix(in srgb, var(--lu-danger-dark) 82%, var(--lu-ink-900));
  --ds-danger-soft: color-mix(in srgb, var(--lu-danger-dark) 14%, var(--ds-surface));
  --ds-info: var(--lu-info-dark);
  --ds-info-soft: color-mix(in srgb, var(--lu-info-dark) 14%, var(--ds-surface));

  --ds-glass-bg: color-mix(in srgb, var(--lu-ink-800) 80%, transparent);
  --ds-glass-bg-strong: color-mix(in srgb, var(--lu-ink-700) 92%, transparent);
  --ds-glass-border: color-mix(in srgb, var(--lu-ink-600) 75%, transparent);
  --ds-glass-highlight: color-mix(in srgb, var(--lu-neutral-0) 12%, transparent);

  --ds-scrim: color-mix(in srgb, var(--lu-ink-900) 62%, transparent);
  --ds-scrim-strong: color-mix(in srgb, var(--lu-ink-900) 86%, transparent);
  --ds-scrim-soft: color-mix(in srgb, var(--lu-ink-900) 24%, transparent);
  --ds-shadow-color: color-mix(in srgb, var(--lu-ink-900) 45%, transparent);
  --ds-shadow-color-soft: color-mix(in srgb, var(--lu-ink-900) 32%, transparent);
  --ds-shadow-color-strong: color-mix(in srgb, var(--lu-ink-900) 60%, transparent);
  --ds-focus-color: color-mix(in srgb, var(--lu-teal-500) 45%, transparent);

  color-scheme: dark;
}

/* ============================================================
   04 - Band tokens (dark architectural surfaces, theme fixed)
   ============================================================ */

:root {
  --ds-band-bg: var(--lu-ink-900);
  --ds-band-surface: var(--lu-ink-800);
  --ds-band-surface-alt: var(--lu-ink-700);
  --ds-band-text: var(--lu-ink-100);
  --ds-band-text-soft: color-mix(in srgb, var(--lu-ink-100) 64%, transparent);
  --ds-band-text-muted: color-mix(in srgb, var(--lu-ink-100) 52%, transparent);
  --ds-band-border: var(--lu-ink-600);
  --ds-band-border-soft: color-mix(in srgb, var(--lu-ink-600) 55%, transparent);
  --ds-band-hairline: color-mix(in srgb, var(--lu-ink-100) 14%, transparent);
  --ds-band-line: color-mix(in srgb, var(--lu-ink-100) 34%, transparent);
  --ds-band-border-line: color-mix(in srgb, var(--lu-mint) 14%, transparent);
  --ds-band-primary: var(--lu-mint);
  --ds-band-primary-strong: color-mix(in srgb, var(--lu-teal-500) 70%, transparent);
  --ds-band-primary-soft: color-mix(in srgb, var(--lu-mint) 12%, transparent);
  --ds-band-accent: var(--lu-warning-dark);
  --ds-band-accent-soft: color-mix(in srgb, var(--lu-warning-dark) 16%, transparent);
  --ds-band-glass: color-mix(in srgb, var(--lu-ink-800) 72%, transparent);
  --ds-band-shadow: color-mix(in srgb, var(--lu-ink-900) 45%, transparent);
}

/* ============================================================
   05 - Media tokens (photo overlays and cinema chrome)
   ============================================================ */

:root {
  --ds-media-scrim: color-mix(in srgb, var(--lu-ink-900) 72%, transparent);
  --ds-media-scrim-soft: color-mix(in srgb, var(--lu-ink-900) 28%, transparent);
  --ds-media-scrim-mid: color-mix(in srgb, var(--lu-ink-900) 40%, transparent);
  --ds-media-scrim-strong: color-mix(in srgb, var(--lu-ink-900) 94%, transparent);
  --ds-media-text: var(--lu-ink-100);
  --ds-media-text-soft: color-mix(in srgb, var(--lu-ink-100) 72%, transparent);
  --ds-media-border: color-mix(in srgb, var(--lu-ink-100) 22%, transparent);
  --ds-media-highlight: color-mix(in srgb, var(--lu-neutral-0) 15%, transparent);
  --ds-media-accent: var(--lu-warning-dark);
  --ds-media-primary: var(--lu-mint);
}

/* ============================================================
   06 - Typography roles (Arial Narrow display + Inter utility)
   ============================================================ */

:root {
  --font-display: "Arial Narrow", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --text-caption: 0.6875rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.25rem;

  --text-display-sm: clamp(28px, 3vw, 40px);
  --text-display-md: clamp(36px, 4vw, 58px);
  --text-display-lg: clamp(44px, 6vw, 76px);

  --leading-tight: 1.12;
  --leading-snug: 1.35;
  --leading-normal: 1.55;
  --leading-relaxed: 1.7;

  --tracking-tight: -0.01em;
  --tracking-normal: 0;
  --tracking-wide: 0.08em;
  --tracking-wider: 0.18em;
  --tracking-widest: 0.42em;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-black: 800;
}

/* ============================================================
   07 - Spacing scale (4px base unit)
   ============================================================ */

:root {
  --space-unit: 4px;
  --tap-target: 44px;
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-14: 56px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  --section-gap: clamp(64px, 8vw, 120px);
  --container-max: 1450px;
  --container-narrow: 1200px;
  --container-gutter: clamp(16px, 4vw, 48px);
  --grid-columns: 12;
  --grid-gutter: var(--space-6);
}

/* ============================================================
   08 - Radius and border tokens (supporting, not identity)
   ============================================================ */

:root {
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 999px;
  --radius-pill: 30px;
  --border-hairline: 1px;
  --border-standard: 2px;
  --focus-ring-width: 3px;
}

/* ============================================================
   09 - Elevation tokens
   ============================================================ */

:root {
  --shadow-1: 0 2px 8px var(--ds-shadow-color-soft);
  --shadow-2: 0 8px 24px var(--ds-shadow-color);
  --shadow-3: 0 20px 50px var(--ds-shadow-color-strong);
  --shadow-soft: 0 12px 36px var(--ds-shadow-color-soft), 0 2px 6px var(--ds-shadow-color-soft);
  --shadow-hover: 0 20px 50px var(--ds-shadow-color), 0 4px 12px var(--ds-shadow-color-soft);
  --focus-ring: 0 0 0 var(--focus-ring-width) var(--ds-focus-color);
}

/* ============================================================
   09b - Stacking order
   ============================================================ */

:root {
  --z-base: 1;
  --z-header: 40;
  --z-dropdown: 50;
  --z-modal: 60;
  --z-skip: 100;
}

/* ============================================================
   10 - Motion tokens
   ============================================================ */

:root {
  --motion-pulse: 2s ease-in-out;
  --motion-drift: 2.2s cubic-bezier(0.22, 1, 0.36, 1);
  --motion-signal: 1.8s steps(6, end);
  --motion-orbit: 2.8s linear;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 140ms;
  --duration-base: 240ms;
  --duration-slow: 320ms;
  --transition-smooth: all var(--duration-slow) var(--ease-out);
}

@keyframes ds-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.82); }
}

@keyframes ds-pulse-ring {
  0% { opacity: 0.55; transform: scale(0.9); }
  70% { opacity: 0; transform: scale(2.1); }
  100% { opacity: 0; transform: scale(2.1); }
}

@keyframes ds-drift {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes ds-signal {
  0%, 100% { opacity: 0.25; }
  50% { opacity: 1; }
}

@keyframes ds-orbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes ds-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes ds-slide-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes ds-scale-in {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

/* ============================================================
   11 - Base and reset
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ds-bg);
  color: var(--ds-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--weight-black);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

h1 { font-size: var(--text-display-md); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-sm); }
p { margin: 0 0 var(--space-4); }
img { max-width: 100%; display: block; }
a { color: var(--ds-primary); text-decoration: none; }
/* hover accent only for plain prose links: styled anchors keep their own colors */
a:hover:not([class]) { color: var(--ds-primary-hover); }
button { font-family: inherit; }
code, kbd, samp { font-family: var(--font-mono); font-size: 0.92em; }
hr { border: 0; border-top: var(--border-hairline) solid var(--ds-border); }

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

/* Typography role helpers */
.type-display { font-family: var(--font-display); font-size: var(--text-display-lg); font-weight: var(--weight-black); line-height: var(--leading-tight); }
.type-h1 { font-family: var(--font-display); font-size: var(--text-display-md); font-weight: var(--weight-black); line-height: var(--leading-tight); }
.type-h2 { font-family: var(--font-display); font-size: var(--text-3xl); font-weight: var(--weight-black); line-height: var(--leading-tight); }
.type-h3 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: var(--weight-bold); line-height: var(--leading-snug); }
.type-h4 { font-family: var(--font-display); font-size: var(--text-lg); font-weight: var(--weight-bold); }
.type-body { font-family: var(--font-body); font-size: var(--text-base); line-height: var(--leading-normal); }
.type-small { font-family: var(--font-body); font-size: var(--text-sm); line-height: var(--leading-snug); }
.type-caption { font-family: var(--font-body); font-size: var(--text-caption); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--ds-text-muted); }

/* ============================================================
   12 - Layout: container, grid, stack, section rhythm
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-gutter);
}

.container-narrow { max-width: var(--container-narrow); }

.stack { display: grid; gap: var(--space-4); }
.stack-sm { display: grid; gap: var(--space-2); }
.stack-lg { display: grid; gap: var(--space-8); }

.grid { display: grid; gap: var(--grid-gutter); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.row-end { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); }
.inline-form { display: inline-flex; align-items: center; gap: var(--space-2); }
.row-actions { display: flex; align-items: center; gap: var(--space-2); }

.ds-app { margin: 0; min-height: 100vh; display: flex; flex-direction: column; }
.ds-main { flex: 1; display: block; }
.section { padding-block: var(--section-gap); }
.section-surface { background: var(--ds-surface); }

/* Section heading rhythm */
.page-header { margin-bottom: var(--space-6); }
.page-title { font-size: var(--text-display-sm); margin: 0; }
.page-subtitle { color: var(--ds-text-muted); margin: var(--space-2) 0 0; }
.header-titles { display: grid; gap: var(--space-2); }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  color: var(--ds-primary);
}
.section-header { margin-bottom: var(--space-8); }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-4);
  color: var(--ds-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: var(--weight-bold);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.section-tag::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.section-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  letter-spacing: 0.005em;
  line-height: 1.05;
  font-size: var(--text-display-md);
}
.section-title em { font-style: normal; color: var(--ds-primary); }
.section-subtitle { margin: 0; color: var(--ds-text-muted); font-size: var(--text-base); }
/* Dark band context */
.band { background: var(--ds-band-bg); color: var(--ds-band-text); }
.band .section-tag { color: var(--ds-band-accent); }
.band .section-title { color: var(--ds-band-text); }
.band .section-title em { color: var(--ds-band-accent); }
.band .section-subtitle, .band .page-subtitle { color: var(--ds-band-text-soft); }
.band .separator { background: var(--ds-band-hairline); }

.section-header-left { max-width: 620px; }
.section-header-center { max-width: 680px; margin-inline: auto; margin-bottom: var(--space-12); text-align: center; }
.separator { height: var(--border-hairline); background: var(--ds-border); border: 0; }

/* ============================================================
   13 - Icons
   ============================================================ */

.icon {
  width: var(--icon-md);
  height: var(--icon-md);
  flex: none;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

:root {
  --icon-sm: 16px;
  --icon-md: 20px;
  --icon-lg: 24px;
  --icon-xl: 32px;
}

.icon-sm { width: var(--icon-sm); height: var(--icon-sm); }
.icon-lg { width: var(--icon-lg); height: var(--icon-lg); }
.icon-xl { width: var(--icon-xl); height: var(--icon-xl); }

/* ============================================================
   14 - Surfaces: glass, panels, cards
   ============================================================ */

.glass-panel {
  background: var(--ds-glass-bg);
  backdrop-filter: var(--ds-glass-blur);
  -webkit-backdrop-filter: var(--ds-glass-blur);
  border: var(--border-hairline) solid var(--ds-glass-border);
  box-shadow: var(--shadow-soft);
  border-radius: var(--radius-xs);
}

.glass-panel-strong {
  background: var(--ds-glass-bg-strong);
  backdrop-filter: var(--ds-glass-blur);
  -webkit-backdrop-filter: var(--ds-glass-blur);
  border: var(--border-hairline) solid var(--ds-glass-border);
  box-shadow: var(--shadow-hover);
  border-radius: var(--radius-xs);
}

.card {
  background: var(--ds-surface);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.card-header { padding: var(--space-5) var(--space-6) 0; }
.card-title { font-size: var(--text-lg); margin: 0; }
.card-subtitle { color: var(--ds-text-muted); font-size: var(--text-sm); margin: var(--space-1) 0 0; }
.card-body { padding: var(--space-5) var(--space-6); }
.card-header + .card-body { padding-top: var(--space-3); }
.card-footer { padding: 0 var(--space-6) var(--space-5); display: flex; gap: var(--space-2); }
.empty-state { color: var(--ds-text-muted); text-align: center; }

/* ============================================================
   15 - Buttons
   ============================================================ */

.btn,
.btn-primary-teal,
.btn-secondary-glass {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap-target);
  padding: var(--space-3) var(--space-6);
  border: var(--border-hairline) solid transparent;
  border-radius: var(--radius-full);
  background: none;
  color: inherit;
  font: inherit;
  font-weight: var(--weight-semibold);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.btn:focus-visible,
.btn-primary-teal:focus-visible,
.btn-secondary-glass:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn:active,
.btn-primary-teal:active,
.btn-secondary-glass:active { transform: translateY(1px); }
.btn[disabled], .btn.is-disabled { opacity: 0.55; pointer-events: none; }

.btn-primary { background: var(--ds-primary); color: var(--ds-primary-text); }
.btn-primary:hover { background: var(--ds-primary-hover); color: var(--ds-primary-text); }
.btn-secondary { background: var(--ds-secondary); color: var(--ds-secondary-text); }
.btn-secondary:hover { background: var(--ds-primary); color: var(--ds-primary-text); }
.btn-ghost { background: transparent; color: var(--ds-text); border-color: var(--ds-border); }
.btn-ghost:hover { background: var(--ds-surface-alt); color: var(--ds-text); }
.btn-danger { background: var(--ds-danger); color: var(--lu-neutral-0); }
.btn-danger:hover { background: var(--ds-danger-hover); color: var(--lu-neutral-0); }
.btn-glass {
  background: var(--ds-glass-bg);
  backdrop-filter: var(--ds-glass-blur);
  -webkit-backdrop-filter: var(--ds-glass-blur);
  border-color: var(--ds-glass-border);
  color: var(--ds-text);
}
.btn-glass:hover { background: var(--ds-primary); border-color: var(--ds-primary); color: var(--ds-primary-text); }
.btn-success { background: var(--ds-success); color: var(--lu-neutral-0); }
.btn-success:hover { background: var(--ds-success-hover); color: var(--lu-neutral-0); }
.btn-whatsapp, .btn-whatsapp-lg { background: var(--ds-success); color: var(--lu-neutral-0); }
.btn-whatsapp:hover, .btn-whatsapp-lg:hover { background: var(--ds-success-hover); color: var(--lu-neutral-0); }

.btn-sm { min-height: 36px; padding: var(--space-1) var(--space-4); font-size: var(--text-sm); }
.btn-lg { min-height: 52px; padding: var(--space-4) var(--space-8); font-size: var(--text-lg); }
.btn-block { width: 100%; }
.btn-icon { min-height: var(--tap-target); width: var(--tap-target); padding: 0; border-radius: var(--radius-full); }

/* Variant aliases kept for existing markup */
.btn-primary-teal { background: var(--ds-primary); color: var(--ds-primary-text); }
.btn-primary-teal:hover { background: var(--ds-primary-hover); color: var(--ds-primary-text); }
.btn-secondary-glass {
  /* machined ghost: solid surface + hairline border, no blur */
  background: var(--ds-surface);
  border-color: var(--ds-border);
  color: var(--ds-text);
}
.btn-secondary-glass:hover { background: var(--ds-primary); border-color: var(--ds-primary); color: var(--ds-primary-text); }

/* ============================================================
   16 - Form controls
   ============================================================ */

.field { display: grid; gap: var(--space-1); }
.field-label { font-size: var(--text-sm); font-weight: var(--weight-semibold); color: var(--ds-text-muted); }
.field-hint { font-size: var(--text-xs); color: var(--ds-text-muted); }
.field-error { color: var(--ds-danger); font-size: var(--text-sm); margin: 0; }

.input,
.select,
.textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-md);
  background: var(--ds-surface);
  color: var(--ds-text);
  font: inherit;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}

/* native dropdown lists (option popups) follow the theme */
.select option,
.select optgroup {
  background: var(--ds-surface);
  color: var(--ds-text);
}

.select option:checked,
.select option:hover {
  background: color-mix(in srgb, var(--ds-primary) 18%, var(--ds-surface));
  color: var(--ds-primary);
}

.input::placeholder, .textarea::placeholder { color: var(--ds-text-muted); }
.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--ds-primary);
  box-shadow: var(--focus-ring);
}
.input.is-invalid, .select.is-invalid, .textarea.is-invalid { border-color: var(--ds-danger); }
.textarea { resize: vertical; min-height: 120px; }
.check-row { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); }

/* Switch */
.switch { display: inline-flex; align-items: center; gap: var(--space-3); cursor: pointer; min-height: var(--tap-target); }
.switch-input {
  appearance: none;
  width: 46px;
  height: 26px;
  border-radius: var(--radius-full);
  border: var(--border-hairline) solid var(--ds-border);
  background: var(--ds-surface-alt);
  position: relative;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}
.switch-input::after {
  content: "";
  position: absolute;
  inset-block: 2px;
  inset-inline-start: 2px;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--ds-surface);
  box-shadow: var(--shadow-1);
  transition: transform var(--duration-base) var(--ease-out);
}
.switch-input:checked { background: var(--ds-primary); border-color: var(--ds-primary); }
.switch-input:checked::after { transform: translateX(20px); }
.switch-input:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.switch-label { font-size: var(--text-sm); font-weight: var(--weight-medium); }
[dir="rtl"] .switch-input:checked::after { transform: translateX(-20px); }

/* Pills and filter tabs */
.pill-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-pill);
  background: var(--ds-surface);
  color: var(--ds-text);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  transition: var(--transition-smooth);
}
.pill:hover, .pill.is-active {
  background: var(--ds-primary);
  border-color: var(--ds-primary);
  color: var(--ds-primary-text);
  box-shadow: var(--shadow-1);
}

/* ============================================================
   17 - Feedback: alerts, badges, states
   ============================================================ */

.alert {
  padding: var(--space-3) var(--space-4);
  border: var(--border-hairline) solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}
.alert ul { margin: 0; padding-inline-start: var(--space-5); }
.alert-success { background: var(--ds-success-soft); border-color: var(--ds-success); color: var(--ds-text); }
.alert-warning { background: var(--ds-warning-soft); border-color: var(--ds-warning); color: var(--ds-text); }
.alert-danger { background: var(--ds-danger-soft); border-color: var(--ds-danger); color: var(--ds-text); }
.alert-info { background: var(--ds-info-soft); border-color: var(--ds-info); color: var(--ds-text); }

.badge {
  display: inline-block;
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  background: var(--ds-surface-alt);
  color: var(--ds-text-muted);
}
.badge-active { background: var(--ds-success-soft); color: var(--ds-success); }
.badge-inactive { background: var(--ds-surface-alt); color: var(--ds-text-muted); }
.badge-draft { background: var(--ds-warning-soft); color: var(--ds-warning); }
.badge-primary { background: var(--ds-primary-soft); color: var(--ds-primary); }
.badge-danger { background: var(--ds-danger-soft); color: var(--ds-danger); }

/* Product badges (catalog + featured cards) */
.product-sku-badge {
  position: absolute;
  top: var(--space-3);
  inset-inline-end: var(--space-3);
  padding: 2px var(--space-2);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-sm);
  background: var(--ds-surface);
  color: var(--ds-text);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
}
.product-sku-badge-lg {
  position: absolute;
  top: var(--space-4);
  inset-inline-end: var(--space-4);
  padding: var(--space-1) var(--space-3);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-sm);
  background: var(--ds-surface);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
}

/* Semantic state surfaces */
.state { display: grid; gap: var(--space-1); padding: var(--space-4); border-inline-start: var(--border-standard) solid var(--ds-border); background: var(--ds-surface); }
.state-success { border-color: var(--ds-success); }
.state-warning { border-color: var(--ds-warning); }
.state-danger { border-color: var(--ds-danger); }
.state-info { border-color: var(--ds-info); }
.state-title { font-weight: var(--weight-bold); }
.state-text { color: var(--ds-text-muted); font-size: var(--text-sm); margin: 0; }

/* ============================================================
   18 - Data: tables, specs, pagination
   ============================================================ */

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--ds-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}
.table th, .table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-hairline) solid var(--ds-border);
  font-size: var(--text-sm);
  text-align: start;
}
.table thead th { background: var(--ds-surface-alt); color: var(--ds-text-muted); font-weight: var(--weight-semibold); }
.table tbody tr:hover { background: var(--ds-surface-alt); }

.pagination { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-6); }
.page-link {
  min-width: 40px;
  padding: var(--space-1) var(--space-3);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-sm);
  color: var(--ds-text-muted);
  text-align: center;
  text-decoration: none;
}
.page-link:hover { border-color: var(--ds-primary); color: var(--ds-primary); }
.page-link.is-active { background: var(--ds-primary); border-color: var(--ds-primary); color: var(--ds-primary-text); }

/* ============================================================
   19 - Overlays: modal, dropdown
   ============================================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: var(--ds-scrim);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: ds-fade-in var(--duration-base) var(--ease-out) both;
}
.modal-backdrop[hidden] { display: none; }
.modal {
  width: min(560px, 100%);
  background: var(--ds-surface);
  color: var(--ds-text);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3);
  animation: ds-scale-in var(--duration-base) var(--ease-out) both;
}
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: var(--space-5) var(--space-6); }
.modal-title { margin: 0; }
.modal-close { background: none; border: 0; color: var(--ds-text-muted); font-size: var(--text-2xl); line-height: 1; cursor: pointer; }
.modal-close:hover { color: var(--ds-text); }
.modal-body { padding: 0 var(--space-6) var(--space-6); }

.dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + var(--space-2));
  min-width: 190px;
  padding: var(--space-2);
  border: var(--border-hairline) solid var(--ds-glass-border);
  border-radius: var(--radius-md);
  background: var(--ds-glass-bg-strong);
  backdrop-filter: var(--ds-glass-blur);
  -webkit-backdrop-filter: var(--ds-glass-blur);
  box-shadow: var(--shadow-2);
  display: none;
  z-index: 50;
}
.dropdown.is-open .dropdown-menu { display: block; animation: ds-fade-in var(--duration-fast) var(--ease-out) both; }
.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--ds-text-muted);
  font-size: var(--text-sm);
}
.dropdown-item:hover { background: var(--ds-primary-soft); color: var(--ds-text); }
.dropdown-item.is-current { color: var(--ds-primary); font-weight: var(--weight-bold); }

/* ============================================================
   20 - Switchers (theme + language)
   ============================================================ */

.lang-switcher { display: inline-flex; border: var(--border-hairline) solid var(--ds-border); border-radius: var(--radius-full); overflow: hidden; }
.lang-link { padding: var(--space-1) var(--space-3); color: var(--ds-text-muted); font-size: var(--text-sm); text-decoration: none; }
.lang-link.is-active { background: var(--ds-primary); color: var(--ds-primary-text); }

.theme-switcher {
  width: var(--tap-target);
  height: var(--tap-target);
  border: var(--border-hairline) solid var(--ds-border);
  border-radius: var(--radius-full);
  background: var(--ds-surface);
  color: var(--ds-text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.theme-switcher:hover { border-color: var(--ds-primary); color: var(--ds-primary); }

.theme-icon { display: inline-flex; align-items: center; justify-content: center; font-size: var(--text-lg); line-height: var(--leading-tight); }

[data-theme="light"] .theme-icon-sun,
[data-theme="light"] .theme-icon-dark,
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .theme-icon-moon,
[data-theme="dark"] .theme-icon-light,
[data-theme="dark"] .icon-sun { display: none; }

/* ============================================================
   21 - Motion utilities
   ============================================================ */

.anim-fade { animation: ds-fade-in var(--duration-base) var(--ease-out) both; }
.anim-slide-up { animation: ds-slide-up var(--duration-slow) var(--ease-out) both; }
.anim-pulse { animation: ds-pulse var(--motion-pulse) infinite; }
.anim-drift { animation: ds-drift var(--motion-drift) infinite; }
.anim-signal { animation: ds-signal var(--motion-signal) infinite; }
.anim-orbit { animation: ds-orbit var(--motion-orbit) infinite; }

/* ============================================================
   21b - Direction
   ============================================================ */

[dir="rtl"] { direction: rtl; text-align: right; }
[dir="rtl"] .section-header-left { text-align: right; }

/* ============================================================
   22 - Accessibility
   ============================================================ */

:focus-visible { outline: var(--focus-ring-width) solid var(--ds-focus-color); outline-offset: 2px; }

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

.skip-link {
  position: absolute;
  inset-inline-start: var(--space-4);
  top: -100px;
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--ds-primary);
  color: var(--ds-primary-text);
  border-radius: var(--radius-sm);
  transition: top var(--duration-fast) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

/* ============================================================
   23 - Responsive rules
   ============================================================ */

@media (max-width: 1024px) {
  :root { --grid-columns: 8; }
}

@media (max-width: 768px) {
  :root {
    --grid-columns: 4;
    --grid-gutter: var(--space-4);
  }

  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .row-between, .row-end { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4, .grid-auto { grid-template-columns: minmax(0, 1fr); }
  .btn, .btn-primary-teal, .btn-secondary-glass { width: 100%; }
  .btn-icon, .btn-sm { width: auto; }
}

/* ============================================================
   24 - Reduced motion
   ============================================================ */

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

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   25 - Navigation chrome tokens ("Machined Glass")
   Glass slab + machined-metal detail for the header, the
   blueprint rail, the index drawer and the mobile bloom sheet.
   Every value is derived from the brand palette.
   ============================================================ */

:root {
  /* slab glass */
  --ds-nav-glass: color-mix(in srgb, var(--lu-neutral-0) 55%, transparent);
  --ds-nav-glass-dense: color-mix(in srgb, var(--lu-neutral-0) 90%, transparent);
  --ds-nav-field: color-mix(in srgb, var(--lu-neutral-100) 72%, transparent);
  --ds-nav-sheen: color-mix(in srgb, var(--lu-neutral-0) 55%, transparent);
  --ds-nav-edge: color-mix(in srgb, var(--lu-neutral-0) 46%, transparent);
  /* machined detail */
  --ds-nav-groove: color-mix(in srgb, var(--lu-neutral-900) 10%, transparent);
  --ds-nav-hairline: color-mix(in srgb, var(--lu-neutral-900) 14%, transparent);
  --ds-nav-knurl: color-mix(in srgb, var(--lu-neutral-900) 20%, transparent);
  --ds-nav-etch: color-mix(in srgb, var(--lu-neutral-900) 46%, transparent);
  /* signal / blueprint line */
  --ds-nav-line: color-mix(in srgb, var(--lu-teal-500) 62%, transparent);
  --ds-nav-line-soft: color-mix(in srgb, var(--lu-teal-500) 20%, transparent);
  --ds-nav-line-glow: color-mix(in srgb, var(--lu-teal-500) 24%, transparent);
  /* overlays */
  --ds-nav-scrim: color-mix(in srgb, var(--lu-ink-900) 44%, transparent);
  --ds-nav-fade: color-mix(in srgb, var(--lu-neutral-900) 13%, transparent);
  --ds-nav-shadow: 0 16px 38px color-mix(in srgb, var(--lu-neutral-900) 13%, transparent);
  --ds-nav-blur: blur(18px) saturate(165%);
  /* geometry + motion */
  --ds-nav-chamfer: 16px;
  --ds-nav-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ds-nav-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ds-nav-fast: 160ms;
  --ds-nav-base: 260ms;
  --ds-nav-slow: 480ms;
}

[data-theme="dark"] {
  --ds-nav-glass: color-mix(in srgb, var(--lu-ink-800) 52%, transparent);
  --ds-nav-glass-dense: color-mix(in srgb, var(--lu-ink-800) 90%, transparent);
  --ds-nav-field: color-mix(in srgb, var(--lu-ink-700) 76%, transparent);
  --ds-nav-sheen: color-mix(in srgb, var(--lu-ink-100) 14%, transparent);
  --ds-nav-edge: color-mix(in srgb, var(--lu-ink-100) 8%, transparent);
  --ds-nav-groove: color-mix(in srgb, var(--lu-ink-900) 62%, transparent);
  --ds-nav-hairline: color-mix(in srgb, var(--lu-ink-100) 15%, transparent);
  --ds-nav-knurl: color-mix(in srgb, var(--lu-ink-100) 22%, transparent);
  --ds-nav-etch: color-mix(in srgb, var(--lu-ink-100) 58%, transparent);
  --ds-nav-line: color-mix(in srgb, var(--lu-mint) 70%, transparent);
  --ds-nav-line-soft: color-mix(in srgb, var(--lu-mint) 22%, transparent);
  --ds-nav-line-glow: color-mix(in srgb, var(--lu-mint) 26%, transparent);
  --ds-nav-scrim: color-mix(in srgb, var(--lu-ink-900) 58%, transparent);
  --ds-nav-fade: color-mix(in srgb, var(--lu-ink-900) 62%, transparent);
  --ds-nav-shadow: 0 18px 44px color-mix(in srgb, var(--lu-ink-900) 62%, transparent);
}

/* ============================================================
   26 - Scrollbar ("Machined Teal")
   Site-branded scrollbars in both engines. The thumb uses the
   LUFLY teal ramp, the track stays a near-invisible tint of the
   surface so pages keep their calm. Component-level rules that
   deliberately hide scrollbars (e.g. the navbar rails) still win
   because they are more specific or set width/height to 0.
   ============================================================ */

:root {
  --ds-scrollbar-size: 12px;
  --ds-scrollbar-thumb: color-mix(in srgb, var(--lu-teal-500) 78%, var(--lu-deep-teal));
  --ds-scrollbar-thumb-hover: var(--lu-teal-400);
  --ds-scrollbar-thumb-active: var(--lu-teal-600);
  --ds-scrollbar-track: color-mix(in srgb, var(--lu-teal-500) 5%, transparent);
  --ds-scrollbar-border: color-mix(in srgb, var(--ds-surface) 92%, transparent);
}

[data-theme="dark"] {
  --ds-scrollbar-thumb: color-mix(in srgb, var(--lu-teal-400) 72%, var(--lu-mint));
  --ds-scrollbar-thumb-hover: var(--lu-mint);
  --ds-scrollbar-thumb-active: var(--lu-teal-300);
  --ds-scrollbar-track: color-mix(in srgb, var(--lu-mint) 6%, transparent);
  --ds-scrollbar-border: color-mix(in srgb, var(--lu-ink-800) 92%, transparent);
}

/* Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--ds-scrollbar-thumb) var(--ds-scrollbar-track);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--ds-scrollbar-thumb) transparent;
}

/* Chromium, Edge, Safari */
::-webkit-scrollbar {
  width: var(--ds-scrollbar-size);
  height: var(--ds-scrollbar-size);
}

::-webkit-scrollbar-track {
  background: var(--ds-scrollbar-track);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--ds-scrollbar-thumb);
  border: 3px solid transparent;
  border-radius: 10px;
  background-clip: padding-box;
  transition: background-color 160ms ease;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--ds-scrollbar-thumb-hover);
}

::-webkit-scrollbar-thumb:active {
  background-color: var(--ds-scrollbar-thumb-active);
}

::-webkit-scrollbar-corner {
  background: transparent;
}

/* Keyboard focus rings still land on the viewport, keep them teal */
html:focus-within {
  scroll-behavior: smooth;
}