/* ═══════════════════════════════════════════════════════════
   msa505 Design System v3.0 — Glass Morphism + Neon Gradients
   Dark-first, light via [data-theme="light"].
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens (Dark — default) ── */
:root {
  /* Colors — Background (deep space) */
  --color-bg-primary:       #070b12;
  --color-bg-secondary:     #0d1320;
  --color-bg-tertiary:      #151c2c;
  --color-bg-card:          rgba(18, 25, 45, 0.55);
  --color-bg-card-hover:    rgba(24, 34, 58, 0.65);
  --color-bg-input:         rgba(10, 16, 28, 0.75);
  --color-bg-overlay:       rgba(7, 11, 18, 0.82);
  --color-bg-code:          #0d1117;

  /* Colors — Accent (neon gradient palette) */
  --color-accent-primary:       #39bae6;
  --color-accent-primary-glow:  rgba(57, 186, 230, 0.45);
  --color-accent-secondary:     #ff8f40;
  --color-accent-secondary-glow:rgba(255, 143, 64, 0.30);
  --color-accent-success:       #7fd962;
  --color-accent-warning:       #ffb454;
  --color-accent-error:         #f26d78;

  /* Neon accent extensions */
  --neon-cyan:    #00e5ff;
  --neon-purple:  #a855f7;
  --neon-pink:    #ec4899;
  --neon-blue:    #3b82f6;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-primary), var(--neon-purple));
  --gradient-accent:  linear-gradient(135deg, var(--neon-pink), var(--color-accent-secondary));
  --gradient-cyan:    linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
  --gradient-text:    linear-gradient(135deg, var(--color-accent-primary) 0%, var(--neon-purple) 50%, var(--neon-pink) 100%);

  /* Colors — Border */
  --color-border-default:   rgba(255, 255, 255, 0.08);
  --color-border-light:     rgba(255, 255, 255, 0.06);
  --color-border-focus:     var(--color-accent-primary);

  /* Colors — Text */
  --color-text-primary:     #e6edf3;
  --color-text-secondary:   #8b97a5;
  --color-text-tertiary:    #5c6876;
  --color-text-inverse:     #070b12;
  --color-text-link:        var(--color-accent-primary);

  /* ── Glass Morphism ── */
  --glass-bg:      rgba(18, 25, 45, 0.45);
  --glass-bg-hover:rgba(24, 34, 58, 0.60);
  --glass-border:  rgba(255, 255, 255, 0.08);
  --glass-blur:    16px;
  --glass-shadow:  0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.06) inset;
  --glass-glow:    0 0 30px rgba(57, 186, 230, 0.15), 0 8px 32px rgba(0, 0, 0, 0.4);

  /* ── 3D Elevation ── */
  --elevation-1: 0 2px 8px rgba(0,0,0,0.3);
  --elevation-2: 0 4px 16px rgba(0,0,0,0.35), 0 1px 3px rgba(0,0,0,0.2);
  --elevation-3: 0 12px 40px rgba(0,0,0,0.5), 0 4px 8px rgba(0,0,0,0.3);
  --elevation-glow: 0 0 40px rgba(57,186,230,0.2), 0 12px 40px rgba(0,0,0,0.5);

  /* Typography */
  --font-sans:   'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', monospace;
  --font-display:'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --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:   2rem;      --text-4xl:   2.5rem;
  --text-5xl:   3.5rem;

  --leading-tight:  1.2;  --leading-normal: 1.6;  --leading-relaxed: 1.8;

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

  /* Spacing */
  --space-xs:  0.25rem;  --space-sm:  0.5rem;   --space-md:  1rem;
  --space-lg:  1.5rem;   --space-xl:  2rem;     --space-2xl: 3rem;
  --space-3xl: 4rem;     --space-4xl: 6rem;

  /* Layout */
  --container-max:     1200px;
  --container-narrow:  800px;
  --container-wide:    1400px;
  --content-padding:   var(--space-lg);

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

  /* Shadows */
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.3);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px var(--color-accent-primary-glow);

  /* Transitions */
  --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index */
  --z-dropdown: 100;  --z-sticky: 200;  --z-overlay: 300;
  --z-modal:    400;  --z-toast:  500;
}

/* ── Light Theme Override ── */
[data-theme="light"] {
  --color-bg-primary:       #f0f3f8;
  --color-bg-secondary:     #e6eaf2;
  --color-bg-tertiary:      #dce1eb;
  --color-bg-card:          rgba(255, 255, 255, 0.60);
  --color-bg-card-hover:    rgba(255, 255, 255, 0.80);
  --color-bg-input:         rgba(255, 255, 255, 0.85);
  --color-bg-overlay:       rgba(240, 243, 248, 0.82);
  --color-bg-code:          #f0f2f5;

  --color-accent-primary-glow:  rgba(57, 186, 230, 0.20);
  --color-accent-secondary-glow:rgba(255, 143, 64, 0.15);

  --color-border-default:   rgba(0, 0, 0, 0.06);
  --color-border-light:     rgba(0, 0, 0, 0.04);
  --color-text-primary:     #1a1f2e;
  --color-text-secondary:   #5a6575;
  --color-text-tertiary:    #8b95a5;
  --color-text-inverse:     #f0f3f8;

  --glass-bg:      rgba(255, 255, 255, 0.50);
  --glass-bg-hover:rgba(255, 255, 255, 0.75);
  --glass-border:  rgba(0, 0, 0, 0.06);
  --glass-shadow:  0 4px 20px rgba(0,0,0,0.06), 0 0 0 1px rgba(255,255,255,0.8) inset;
  --glass-glow:    0 0 20px rgba(57,186,230,0.08), 0 4px 20px rgba(0,0,0,0.06);

  --elevation-1:  0 1px 4px rgba(0,0,0,0.06);
  --elevation-2:  0 2px 10px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --elevation-3:  0 8px 30px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.05);

  --shadow-sm:  0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:  0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg:  0 4px 20px rgba(0,0,0,0.1);
}

/* ════════════════════════════════════════
   Reset & Base
   ════════════════════════════════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-sans);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text-primary);background:var(--color-bg-primary);overflow-x:hidden;min-height:100vh}
a{color:var(--color-text-link);text-decoration:none;transition:color var(--transition-fast)}
a:hover{color:var(--color-accent-primary)}
img,svg{max-width:100%;height:auto;display:block}
button,input,select,textarea{font-family:inherit;font-size:var(--text-sm);color:inherit}
::selection{background:var(--color-accent-primary);color:var(--color-text-inverse)}
:focus-visible{outline:2px solid var(--color-accent-primary);outline-offset:2px}

/* ════════════════════════════════════════
   Utility: Glass Panel
   ════════════════════════════════════════ */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal), border-color var(--transition-normal);
}
.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: var(--glass-glow);
  transform: translateY(-2px);
}

/* ════════════════════════════════════════
   Utility: Gradient Text
   ════════════════════════════════════════ */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ════════════════════════════════════════
   Utility: Container
   ════════════════════════════════════════ */
.container{width:100%;max-width:var(--container-max);margin-inline:auto;padding-inline:var(--content-padding)}
.container--narrow{max-width:var(--container-narrow)}
.container--wide{max-width:var(--container-wide)}

/* ════════════════════════════════════════
   Section
   ════════════════════════════════════════ */
.section{padding:var(--space-3xl) 0}
.section--tight{padding:var(--space-2xl) 0}
.section--hero{padding:var(--space-4xl) 0 var(--space-3xl)}

.section-header{margin-bottom:var(--space-2xl);text-align:center}
.section-label{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--radius-full);
  border:1px solid var(--color-border-default);
  font-size:var(--text-xs);text-transform:uppercase;
  letter-spacing:0.05em;color:var(--color-text-secondary);
  margin-bottom:var(--space-md);
}
.section-title{
  font-size:var(--text-3xl);font-weight:var(--weight-bold);
  color:var(--color-text-primary);margin-bottom:var(--space-sm);
}
.section-desc{
  font-size:var(--text-base);color:var(--color-text-secondary);
  max-width:560px;margin-inline:auto;
}

/* ════════════════════════════════════════
   Site Header
   ════════════════════════════════════════ */
.site-header{
  position:sticky;top:0;z-index:var(--z-sticky);
  background:var(--glass-bg);backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--glass-border);
  transition:background var(--transition-normal);
}
.header-inner{
  display:flex;align-items:center;gap:var(--space-xl);
  height:64px;padding-inline:var(--content-padding);
}
.site-logo{
  display:flex;align-items:center;gap:var(--space-sm);
  font-weight:var(--weight-bold);font-size:var(--text-lg);
  color:var(--color-text-primary);text-decoration:none;
  white-space:nowrap;flex-shrink:0;
}
.site-logo-mark{
  font-family:var(--font-mono);font-size:var(--text-xl);
  background:var(--gradient-primary);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.site-nav{flex:1}
.nav-list{display:flex;list-style:none;gap:var(--space-xs)}
.nav-list a{
  display:block;padding:var(--space-sm) var(--space-md);
  font-size:var(--text-sm);font-weight:var(--weight-medium);
  color:var(--color-text-secondary);border-radius:var(--radius-md);
  transition:color var(--transition-fast),background var(--transition-fast);
}
.nav-list a:hover,
.nav-list a.active{color:var(--color-text-primary);background:rgba(57,186,230,0.08)}

/* Theme Toggle */
.theme-toggle{
  display:flex;align-items:center;justify-content:center;
  width:36px;height:36px;border:1px solid var(--color-border-default);
  border-radius:var(--radius-md);background:var(--color-bg-tertiary);
  color:var(--color-text-secondary);cursor:pointer;
  transition:border-color var(--transition-fast),color var(--transition-fast);
  flex-shrink:0;
}
.theme-toggle:hover{border-color:var(--color-accent-primary);color:var(--color-text-primary)}
.theme-toggle svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.theme-toggle .icon-sun,.theme-toggle .icon-moon{display:none}
[data-theme="dark"] .theme-toggle .icon-sun{display:none}
[data-theme="dark"] .theme-toggle .icon-moon{display:block}
[data-theme="light"] .theme-toggle .icon-sun{display:block}
[data-theme="light"] .theme-toggle .icon-moon{display:none}
:root:not([data-theme]) .theme-toggle .icon-sun{display:none}
:root:not([data-theme]) .theme-toggle .icon-moon{display:block}

/* Mobile Menu */
.mobile-menu-toggle{
  display:none;align-items:center;justify-content:center;
  width:36px;height:36px;border:1px solid var(--color-border-default);
  border-radius:var(--radius-md);background:var(--color-bg-tertiary);
  cursor:pointer;color:var(--color-text-secondary);
}
.mobile-menu-toggle svg{width:20px;height:20px}

/* ════════════════════════════════════════
   Button System (glass + neon variants)
   ════════════════════════════════════════ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);
  padding:var(--space-sm) var(--space-xl);border-radius:var(--radius-md);
  font-size:var(--text-sm);font-weight:var(--weight-semibold);
  border:none;cursor:pointer;text-decoration:none;
  transition:all var(--transition-fast);white-space:nowrap;
  line-height:1.5;
}
.btn--primary{
  background:var(--gradient-primary);
  color:var(--color-text-inverse);
  box-shadow:0 2px 12px rgba(57,186,230,0.3);
}
.btn--primary:hover{
  box-shadow:0 4px 20px rgba(57,186,230,0.45);
  transform:translateY(-1px);
}
.btn--secondary{
  background:var(--glass-bg);
  backdrop-filter:blur(var(--glass-blur));
  -webkit-backdrop-filter:blur(var(--glass-blur));
  border:1px solid var(--glass-border);
  color:var(--color-text-primary);
}
.btn--secondary:hover{
  border-color:var(--color-accent-primary);
  box-shadow:0 0 20px rgba(57,186,230,0.12);
}
.btn--ghost{
  background:transparent;
  color:var(--color-text-secondary);
}
.btn--ghost:hover{color:var(--color-text-primary);background:var(--color-bg-tertiary)}
.btn--sm{padding:var(--space-xs) var(--space-md);font-size:var(--text-xs)}
.btn--lg{padding:var(--space-md) var(--space-2xl);font-size:var(--text-base);border-radius:var(--radius-lg)}

/* Glass button — translucent primary */
.btn--glass{
  background:rgba(57,186,230,0.12);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  border:1px solid rgba(57,186,230,0.25);
  color:var(--color-accent-primary);
  box-shadow:0 0 12px rgba(57,186,230,0.08);
}
.btn--glass:hover{
  background:rgba(57,186,230,0.20);
  border-color:rgba(57,186,230,0.45);
  box-shadow:0 0 24px rgba(57,186,230,0.18);
  transform:translateY(-1px);
}

/* ════════════════════════════════════════
   Card System (Glass Morphism)
   ════════════════════════════════════════ */
.glass-card{
  display:flex;flex-direction:column;padding:var(--space-lg);
  border-radius:var(--radius-lg);
  background:var(--glass-bg);
  backdrop-filter:blur(var(--glass-blur));
  -webkit-backdrop-filter:blur(var(--glass-blur));
  border:1px solid var(--glass-border);
  box-shadow:var(--glass-shadow);
  transition:all var(--transition-normal);
  text-decoration:none;color:inherit;
  position:relative;overflow:hidden;
}
.glass-card::before{
  content:'';position:absolute;inset:0;border-radius:inherit;
  background:linear-gradient(135deg,rgba(255,255,255,0.04) 0%,transparent 50%);
  pointer-events:none;z-index:0;
}
.glass-card:hover{
  border-color:rgba(255,255,255,0.14);
  box-shadow:var(--glass-glow);
  transform:translateY(-4px);
}
.glass-card>*{position:relative;z-index:1}

.glass-card-icon{
  width:44px;height:44px;border-radius:var(--radius-md);
  display:grid;place-items:center;font-size:22px;
  background:rgba(57,186,230,0.08);
  border:1px solid rgba(57,186,230,0.12);
  margin-bottom:var(--space-md);
  transition:all var(--transition-normal);
}
.glass-card:hover .glass-card-icon{
  background:rgba(57,186,230,0.14);
  border-color:rgba(57,186,230,0.25);
  box-shadow:0 0 16px rgba(57,186,230,0.15);
  transform:scale(1.05);
}
.glass-card-title{
  font-size:var(--text-base);font-weight:var(--weight-semibold);
  color:var(--color-text-primary);margin-bottom:4px;
}
.glass-card-desc{
  font-size:var(--text-sm);color:var(--color-text-secondary);
  line-height:var(--leading-relaxed);flex:1;
}
.glass-card-badge{
  margin-top:var(--space-md);align-self:flex-start;
  font-family:var(--font-mono);font-size:var(--text-xs);
  font-weight:var(--weight-semibold);text-transform:uppercase;
  letter-spacing:0.04em;padding:3px 10px;
  border-radius:var(--radius-full);
  background:rgba(57,186,230,0.10);
  color:var(--color-accent-primary);
  border:1px solid rgba(57,186,230,0.18);
}

/* Card Grid */
.card-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;
}
@media(max-width:1024px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.card-grid{grid-template-columns:1fr}}

/* ════════════════════════════════════════
   Hero Section
   ════════════════════════════════════════ */
.hero{position:relative;z-index:2;padding:var(--space-4xl) var(--content-padding) var(--space-3xl);text-align:center}
.hero-inner{max-width:760px;margin:0 auto}
.hero-label{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;border-radius:var(--radius-full);font-size:var(--text-xs);color:var(--color-text-secondary);margin-bottom:var(--space-xl);
  background:rgba(57,186,230,0.06);border:1px solid rgba(57,186,230,0.15);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.hero-label svg{width:15px;height:15px;fill:var(--color-accent-primary)}
.hero-title{font-size:clamp(40px,6vw,76px);font-weight:var(--weight-extrabold);letter-spacing:-.035em;line-height:1.05;margin-bottom:var(--space-lg);color:var(--color-text-primary)}
.hero-desc{font-size:var(--text-lg);color:var(--color-text-secondary);line-height:var(--leading-relaxed);max-width:560px;margin:0 auto var(--space-xl);}
.hero-actions{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}

/* ════════════════════════════════════════
   CTA Section
   ════════════════════════════════════════ */
.cta-section{
  position:relative;z-index:2;
  padding:var(--space-4xl) var(--content-padding);
  text-align:center;
}
.cta-section::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse 60% 50% at 50% 50%,rgba(57,186,230,0.06) 0%,transparent 70%);
  pointer-events:none;
}

/* ════════════════════════════════════════
   Footer
   ════════════════════════════════════════ */
.site-footer{
  position:relative;z-index:2;
  border-top:1px solid var(--glass-border);
  background:var(--glass-bg);
  backdrop-filter:blur(var(--glass-blur));
  -webkit-backdrop-filter:blur(var(--glass-blur));
  padding:var(--space-3xl) var(--content-padding) var(--space-xl);
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--space-2xl)}
.footer-brand-desc{font-size:var(--text-sm);color:var(--color-text-tertiary);line-height:var(--leading-relaxed);margin-top:var(--space-sm);max-width:280px}
.footer-heading{font-size:var(--text-sm);font-weight:var(--weight-semibold);color:var(--color-text-primary);margin-bottom:var(--space-md);text-transform:uppercase;letter-spacing:0.05em}
.footer-links{list-style:none}
.footer-links li{margin-bottom:var(--space-sm)}
.footer-links a{font-size:var(--text-sm);color:var(--color-text-tertiary);transition:color var(--transition-fast)}
.footer-links a:hover{color:var(--color-accent-primary)}
.footer-bottom{display:flex;justify-content:space-between;padding-top:var(--space-xl);margin-top:var(--space-2xl);border-top:1px solid var(--glass-border);font-size:var(--text-xs);color:var(--color-text-tertiary)}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{flex-direction:column;gap:var(--space-sm);text-align:center}}

/* ════════════════════════════════════════
   Badge
   ════════════════════════════════════════ */
.badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 10px;border-radius:var(--radius-full);
  font-family:var(--font-mono);font-size:var(--text-xs);
  font-weight:var(--weight-semibold);text-transform:uppercase;
  letter-spacing:0.04em;
  background:rgba(57,186,230,0.10);
  color:var(--color-accent-primary);
  border:1px solid rgba(57,186,230,0.18);
}
.badge--pink{background:rgba(236,72,153,0.10);color:var(--neon-pink);border-color:rgba(236,72,153,0.18)}
.badge--purple{background:rgba(168,85,247,0.10);color:var(--neon-purple);border-color:rgba(168,85,247,0.18)}
.badge--orange{background:rgba(255,143,64,0.10);color:var(--color-accent-secondary);border-color:rgba(255,143,64,0.18)}

/* ════════════════════════════════════════
   Pagination
   ════════════════════════════════════════ */
.pagination{display:flex;justify-content:center;gap:var(--space-sm);padding:var(--space-2xl) 0}
.pagination .btn{min-width:36px;justify-content:center}

/* ════════════════════════════════════════
   Particle BG (optional)
   ════════════════════════════════════════ */
.particles-bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.particle{position:absolute;border-radius:50%;background:var(--color-accent-primary);opacity:0.15;animation:particleFloat linear infinite}
@keyframes particleFloat{
  0%{transform:translateY(0) translateX(0) scale(1);opacity:0}
  10%{opacity:0.25}
  90%{opacity:0.25}
  100%{transform:translateY(-100vh) translateX(40px) scale(0.3);opacity:0}
}

/* ════════════════════════════════════════
   3D Card Tilt (optional JS enhancement)
   ════════════════════════════════════════ */
.tilt-card{
  transform-style:preserve-3d;
  perspective:800px;
}
.tilt-card .tilt-inner{transform-style:preserve-3d;transition:transform var(--transition-normal)}

/* ════════════════════════════════════════
   Responsive Nav
   ════════════════════════════════════════ */
@media(max-width:768px){
  .mobile-menu-toggle{display:flex}
  .site-nav{position:absolute;top:64px;left:0;right:0;background:var(--glass-bg);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--glass-border);display:none}
  .site-nav.is-open{display:block}
  .nav-list{flex-direction:column;padding:var(--space-md) 0}
  .nav-list a{padding:var(--space-md) var(--space-xl)}
}

/* ════════════════════════════════════════
   Anti-FOUC
   ════════════════════════════════════════ */
html:not([data-theme]) body{visibility:hidden}
html[data-theme] body{visibility:visible}