/* ==========================================================================
   HSYST ECOSYSTEM — SHARED DESIGN SYSTEM
   Purple / Green / Black — Modern, Elegant, Technological
   ========================================================================== */

/* ---- CSS Custom Properties (Design Tokens) ---- */
:root {
  /* Core Palette — Shared Foundation */
  --color-black-deep:       #08090B;
  --color-black-secondary:  #111318;
  --color-graphite:         #191B22;
  --color-border-subtle:    #292B33;
  --color-border-muted:     #2E3138;

  --color-purple-main:      #8B5CF6;
  --color-purple-dark:      #5B21B6;
  --color-purple-light:     #A78BFA;
  --color-purple-glow:      rgba(139, 92, 246, 0.35);
  --color-purple-glow-soft: rgba(139, 92, 246, 0.15);

  --color-green-main:       #22C55E;
  --color-green-soft:       #86EFAC;
  --color-green-glow:       rgba(34, 197, 94, 0.35);
  --color-green-glow-soft:  rgba(34, 197, 94, 0.15);

  --color-white-soft:       #F4F4F5;
  --color-gray-neutral:     #A1A1AA;
  --color-gray-muted:       #71717A;

  /* Semantic Colors (can be overridden by themes) */
  --color-accent-primary:   var(--color-purple-main);
  --color-accent-secondary: var(--color-green-main);
  --color-accent-glow:      var(--color-purple-glow);
  --color-accent-glow-soft: var(--color-purple-glow-soft);

  /* Typography */
  --font-sans:      'Inter', 'Geist', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display:   'Sora', 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:      'JetBrains Mono', 'Source Code Pro', 'Fira Code', monospace;

  --font-size-xs:     0.75rem;    /* 12px */
  --font-size-sm:     0.875rem;   /* 14px */
  --font-size-base:   1rem;       /* 16px */
  --font-size-lg:     1.125rem;   /* 18px */
  --font-size-xl:     1.25rem;    /* 20px */
  --font-size-2xl:    1.5rem;     /* 24px */
  --font-size-3xl:    1.875rem;   /* 30px */
  --font-size-4xl:    2.25rem;    /* 36px */
  --font-size-5xl:    3rem;       /* 48px */
  --font-size-6xl:    3.75rem;    /* 60px */
  --font-size-7xl:    4.5rem;     /* 72px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold:   700;
  --font-weight-extrabold: 800;

  --line-height-tight:   1.1;
  --line-height-snug:    1.375;
  --line-height-normal:  1.5;
  --line-height-relaxed: 1.625;

  /* Spacing Scale */
  --space-0:   0;
  --space-1:   0.25rem;   /* 4px */
  --space-2:   0.5rem;    /* 8px */
  --space-3:   0.75rem;   /* 12px */
  --space-4:   1rem;      /* 16px */
  --space-5:   1.25rem;   /* 20px */
  --space-6:   1.5rem;    /* 24px */
  --space-8:   2rem;      /* 32px */
  --space-10:  2.5rem;    /* 40px */
  --space-12:  3rem;      /* 48px */
  --space-16:  4rem;      /* 64px */
  --space-20:  5rem;      /* 80px */
  --space-24:  6rem;      /* 96px */
  --space-32:  8rem;      /* 128px */

  /* Border Radius */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   14px;
  --radius-xl:   18px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* Shadows & Depth */
  --shadow-sm:   0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:   0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg:   0 12px 28px rgba(0, 0, 0, 0.5);
  --shadow-xl:   0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px -18px var(--color-accent-glow);
  --shadow-glow-soft: 0 0 60px -24px var(--color-accent-glow-soft);

  /* Glass / Translucency */
  --glass-bg:        rgba(25, 27, 34, 0.65);
  --glass-bg-strong: rgba(17, 19, 24, 0.85);
  --glass-border:    rgba(255, 255, 255, 0.08);
  --glass-border-hover: var(--color-accent-primary);
  --glass-blur:      blur(16px);
  --glass-blur-strong: blur(24px);

  /* Transitions */
  --duration-fast:   150ms;
  --duration-normal: 250ms;
  --duration-slow:   350ms;
  --ease-out:        cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out:     cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring:     cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index Layers */
  --z-bg:        0;
  --z-content:   10;
  --z-sticky:    40;
  --z-nav:       50;
  --z-dropdown:  60;
  --z-modal:     70;
  --z-toast:     80;
  --z-overlay:   90;

  /* Container */
  --container-max: 1280px;
  --container-padding: var(--space-6);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

@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;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-white-soft);
  background-color: var(--color-black-deep);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- Selection ---- */
::selection {
  background: var(--color-purple-main);
  color: var(--color-black-deep);
}

/* ---- Focus Visible ---- */
:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-black-secondary); }
::-webkit-scrollbar-thumb { background: var(--color-graphite); border-radius: 4px; border: 2px solid var(--color-black-secondary); }
::-webkit-scrollbar-thumb:hover { background: var(--color-border-subtle); }

/* ---- Links ---- */
a { color: inherit; text-decoration: none; transition: color var(--duration-fast) var(--ease-out); }
a:hover { color: var(--color-accent-primary); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  text-decoration: none;
}

.btn:disabled { opacity: 0.4; cursor: not-allowed; pointer-events: none; }

/* Primary — Accent color fill */
.btn--primary {
  background: var(--color-accent-primary);
  color: var(--color-black-deep);
  border-color: var(--color-accent-primary);
  box-shadow: 0 4px 16px var(--color-accent-glow-soft);
}
.btn--primary:hover:not(:disabled) {
  background: var(--color-accent-primary);
  filter: brightness(1.1);
  box-shadow: 0 8px 24px var(--color-accent-glow);
  transform: translateY(-2px);
}
.btn--primary:active:not(:disabled) { transform: translateY(0) scale(0.98); }

/* Secondary — Glass / Outline */
.btn--secondary {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  color: var(--color-white-soft);
  border-color: var(--glass-border);
}
.btn--secondary:hover:not(:disabled) {
  background: var(--glass-bg-strong);
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-glow-soft);
}

/* Ghost — Minimal */
.btn--ghost {
  background: transparent;
  color: var(--color-gray-neutral);
  border-color: transparent;
}
.btn--ghost:hover:not(:disabled) {
  color: var(--color-white-soft);
  background: var(--glass-bg);
}

/* Success / Green */
.btn--success {
  background: var(--color-green-main);
  color: var(--color-black-deep);
  border-color: var(--color-green-main);
  box-shadow: 0 4px 16px var(--color-green-glow-soft);
}
.btn--success:hover:not(:disabled) {
  filter: brightness(1.1);
  box-shadow: 0 8px 24px var(--color-green-glow);
  transform: translateY(-2px);
}

/* Sizes */
.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--font-size-xs); }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--font-size-base); }
.btn--xl { padding: var(--space-5) var(--space-10); font-size: var(--font-size-lg); }

/* Full width */
.btn--block { width: 100%; }

/* ---- Cards ---- */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-out);
}
.card:hover {
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow-soft);
  transform: translateY(-4px);
}

.card--elevated {
  background: var(--color-graphite);
  border-color: var(--color-border-subtle);
  box-shadow: var(--shadow-md);
}
.card--elevated:hover {
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  transform: translateY(-6px);
}

.card--gradient {
  background: linear-gradient(150deg, rgba(139, 92, 246, 0.08), rgba(34, 197, 94, 0.04));
  border-color: rgba(139, 92, 246, 0.2);
}

/* ---- Form Inputs ---- */
.input {
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--color-white-soft);
  background: var(--color-black-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  transition: all var(--duration-fast) var(--ease-out);
}
.input::placeholder { color: var(--color-gray-muted); }
.input:hover { border-color: var(--color-border-muted); }
.input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-glow-soft);
  background: var(--color-graphite);
}
.input:disabled { opacity: 0.5; cursor: not-allowed; }

.input--sm { padding: var(--space-2) var(--space-3); font-size: var(--font-size-sm); }
.input--lg { padding: var(--space-4) var(--space-5); font-size: var(--font-size-lg); }

.label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-white-soft);
  margin-bottom: var(--space-2);
}

.field { display: grid; gap: var(--space-2); }
.field--inline { grid-template-columns: auto 1fr; align-items: center; gap: var(--space-3); }

/* ---- Badges / Tags ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  white-space: nowrap;
}
.badge--primary {
  background: var(--color-purple-glow-soft);
  color: var(--color-purple-light);
  border-color: rgba(139, 92, 246, 0.3);
}
.badge--success {
  background: var(--color-green-glow-soft);
  color: var(--color-green-soft);
  border-color: rgba(34, 197, 94, 0.3);
}
.badge--neutral {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-gray-neutral);
  border-color: var(--color-border-subtle);
}

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: rgba(8, 9, 11, 0.85);
  backdrop-filter: var(--glass-blur-strong);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: all var(--duration-normal) var(--ease-out);
}
.nav--scrolled {
  background: rgba(8, 9, 11, 0.95);
  box-shadow: var(--shadow-md);
}
.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-4) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white-soft);
  text-decoration: none;
  flex-shrink: 0;
}
.nav__brand-accent { color: var(--color-accent-primary); }
.nav__menu { display: flex; align-items: center; gap: var(--space-8); list-style: none; }
.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-neutral);
  padding: var(--space-1) 0;
  position: relative;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-primary);
  border-radius: 2px;
  transition: width var(--duration-normal) var(--ease-out);
}
.nav__link:hover, .nav__link--active { color: var(--color-white-soft); }
.nav__link:hover::after, .nav__link--active::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: var(--space-3); }
.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--color-white-soft);
  cursor: pointer;
}
@media (max-width: 768px) {
  .nav__toggle { display: flex; align-items: center; justify-content: center; }
  .nav__menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-black-secondary);
    border-bottom: 1px solid var(--color-border-subtle);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-out);
  }
  .nav__menu--open { transform: translateY(0); opacity: 1; visibility: visible; }
}

/* ---- Hero / Section Backgrounds ---- */
.bg-atmosphere {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: var(--z-bg);
}
.bg-atmosphere__gradient {
  position: absolute;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  animation: float-slow 20s ease-in-out infinite;
}
.bg-atmosphere__gradient--purple {
  background: radial-gradient(circle at 30% 30%, var(--color-purple-main), transparent 70%);
  top: -200px;
  left: -200px;
}
.bg-atmosphere__gradient--green {
  background: radial-gradient(circle at 70% 70%, var(--color-green-main), transparent 70%);
  bottom: -200px;
  right: -200px;
  animation-delay: -10s;
}
.bg-atmosphere__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.03) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.bg-atmosphere__vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, var(--color-black-deep) 100%);
  pointer-events: none;
}

@keyframes float-slow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.05); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}

/* ---- Section Base ---- */
.section {
  position: relative;
  padding: var(--space-20) var(--container-padding);
}
.section__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}
.section__header { text-align: center; margin-bottom: var(--space-16); }
.section__badge { display: inline-flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-4); }
.section__title {
  font-family: var(--font-display);
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-6xl));
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  color: var(--color-white-soft);
  margin-bottom: var(--space-4);
}
.section__title-accent { color: var(--color-accent-primary); }
.section__subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-gray-neutral);
  max-width: 700px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

/* ---- Gradient Text ---- */
.gradient-text {
  background: linear-gradient(90deg, var(--color-purple-light), var(--color-green-soft), var(--color-purple-light));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-shift 8s linear infinite;
}
@keyframes gradient-shift { to { background-position: 200% center; } }

/* ---- Reveal Animations ---- */
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s var(--ease-out); }
.reveal--visible { opacity: 1; transform: translateY(0); }
.reveal--delay-1 { transition-delay: 100ms; }
.reveal--delay-2 { transition-delay: 200ms; }
.reveal--delay-3 { transition-delay: 300ms; }
.reveal--delay-4 { transition-delay: 400ms; }
.reveal--delay-5 { transition-delay: 500ms; }

/* ---- Tab Panes ---- */
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fadeInUp 0.5s var(--ease-out); }

/* ---- Staggered Grid ---- */
.grid { display: grid; gap: var(--space-6); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
@media (max-width: 1024px) { .grid--3 { grid-template-columns: repeat(2, 1fr); } .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid--2, .grid--3, .grid--4, .grid--auto { grid-template-columns: 1fr; } }

/* ---- Divider ---- */
.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--color-border-subtle), transparent); margin: var(--space-16) 0; }

/* ---- Footer ---- */
.footer {
  background: var(--color-black-secondary);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-16) var(--container-padding) var(--space-8);
}
.footer__inner { max-width: var(--container-max); margin: 0 auto; }
.footer__grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: var(--space-12); margin-bottom: var(--space-12); }
@media (max-width: 768px) { .footer__grid { grid-template-columns: 1fr; gap: var(--space-8); } }
.footer__brand { font-family: var(--font-display); font-size: var(--font-size-xl); font-weight: var(--font-weight-extrabold); color: var(--color-white-soft); margin-bottom: var(--space-4); }
.footer__desc { color: var(--color-gray-neutral); line-height: var(--line-height-relaxed); max-width: 300px; }
.footer__heading { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-white-soft); margin-bottom: var(--space-4); }
.footer__links { list-style: none; display: grid; gap: var(--space-3); }
.footer__link { color: var(--color-gray-neutral); font-size: var(--font-size-sm); transition: color var(--duration-fast); }
.footer__link:hover { color: var(--color-accent-primary); }
.footer__bottom { padding-top: var(--space-8); border-top: 1px solid var(--color-border-subtle); text-align: center; color: var(--color-gray-muted); font-size: var(--font-size-sm); }

/* ---- Container Utility ---- */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); }

/* ---- Utility Classes ---- */
.text-center { text-align: center; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* ---- Icon Sizing ---- */
.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }

/* ---- Loading Spinner ---- */
.spinner {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 3px solid var(--color-border-subtle);
  border-top-color: var(--color-accent-primary);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Terminal / Code Block ---- */
.terminal {
  background: var(--color-black-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}
.terminal__header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-graphite);
  border-bottom: 1px solid var(--color-border-subtle);
}
.terminal__dot { width: 12px; height: 12px; border-radius: 50%; }
.terminal__dot--red { background: #EF4444; }
.terminal__dot--yellow { background: #FBBF24; }
.terminal__dot--green { background: var(--color-green-main); }
.terminal__title { font-size: var(--font-size-xs); color: var(--color-gray-neutral); margin-left: var(--space-2); }
.terminal__body { padding: var(--space-4); max-height: 400px; overflow-y: auto; }
.terminal__line { display: flex; gap: var(--space-3); margin-bottom: var(--space-2); }
.terminal__prompt { color: var(--color-green-main); white-space: nowrap; }
.terminal__command { color: var(--color-green-soft); }
.terminal__output { color: var(--color-gray-neutral); margin-left: calc(8ch + var(--space-3)); }
.terminal__output--success { color: var(--color-green-main); }
.terminal__output--warning { color: #FBBF24; }
.terminal__output--error { color: #EF4444; }
.terminal__cursor { display: inline-block; width: 8px; height: 1.2em; background: var(--color-accent-primary); margin-left: 4px; animation: blink 1s infinite; vertical-align: middle; }
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

/* ---- Tooltip ---- */
.tooltip { position: relative; }
.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--color-graphite);
  border: 1px solid var(--color-border-subtle);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-white-soft);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast) var(--ease-out);
  z-index: var(--z-toast);
}
.tooltip:hover::after { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(-4px); }

/* ---- Notification Toast ---- */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-graphite);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  color: var(--color-white-soft);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  z-index: var(--z-toast);
}
.toast--visible { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.toast--success { border-color: var(--color-green-main); background: rgba(34, 197, 94, 0.15); }
.toast--error { border-color: #EF4444; background: rgba(239, 68, 68, 0.15); }

/* ---- Media Queries ---- */
@media (max-width: 640px) {
  :root {
    --container-padding: var(--space-4);
  }
  .section { padding: var(--space-16) var(--container-padding); }
}