/* Devaxio v3 — Cyber-glass design tokens (static / GitHub Pages) */

:root {
  --font-sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;

  --color-bg-deep: #06060f;
  --color-bg-primary: #0a0a18;
  --color-bg-secondary: #10102a;
  --color-bg-elevated: #161632;

  --color-text-primary: #f4f4ff;
  --color-text-secondary: #a8a8c8;
  --color-text-muted: #6b6b8a;

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-glow: rgba(168, 85, 247, 0.35);

  --color-accent: #a855f7;
  --color-accent-cyan: #22d3ee;
  --color-accent-magenta: #ec4899;
  --color-accent-lime: #a3e635;

  --gradient-hero: linear-gradient(135deg, #a855f7 0%, #6366f1 40%, #22d3ee 100%);
  --gradient-card: linear-gradient(145deg, rgba(168, 85, 247, 0.15), rgba(34, 211, 238, 0.08));
  --gradient-btn: linear-gradient(120deg, #7c3aed, #6366f1, #06b6d4);
  --gradient-text: linear-gradient(90deg, #93c5fd, #818cf8, #38bdf8);

  --color-glass-bg: rgba(16, 16, 42, 0.65);
  --color-glass-border: rgba(255, 255, 255, 0.1);
  --shadow-glow: 0 0 40px rgba(168, 85, 247, 0.25);
  --shadow-card: 0 24px 48px rgba(0, 0, 0, 0.45);

  --color-link-primary: #c084fc;
  --color-link-hover: #67e8f9;
  --color-primary-glow: rgba(168, 85, 247, 0.4);
  --laptop-shadow: 0 24px 64px rgba(168, 85, 247, 0.25), 0 0 0 1px rgba(200, 202, 203, 0.15), inset 0 0 0 1px rgba(255, 255, 255, 0.06);

  --color-success: #4ade80;
  --color-error: #f87171;

  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-pill: 9999px;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --header-h: 5rem;
  --container: min(1200px, 92vw);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 0.2s;
  --duration-base: 0.35s;
}

.light .hero {
  --merge-color-top: #f0f4ff;
  --merge-color-bottom: #f1f5f9;
}

.light {
  --color-bg-deep: #f0f4ff;
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f1f5f9;
  --color-bg-elevated: #ffffff;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: rgba(15, 23, 42, 0.1);
  --color-glass-bg: rgba(255, 255, 255, 0.75);
  --color-glass-border: rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.15);
  --shadow-card: 0 20px 40px rgba(15, 23, 42, 0.08);
  --laptop-shadow: 0 24px 64px rgba(15, 23, 42, 0.25), 0 0 0 1px rgba(200, 202, 203, 0.15), inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  background: var(--color-bg-deep);
  color: var(--color-text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--color-accent);
  color: #fff;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background: var(--gradient-btn);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus { top: var(--space-sm); }

h1, h2, h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); font-weight: 700; }
h2 { font-size: clamp(1.65rem, 3.5vw, 2.35rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 600; }

/* Devaxio.webp = hero / marketing | Devaxio2D.webp = nav, favicon, compact UI */
.brand-logo { display: block; max-width: 100%; height: auto; object-fit: contain; }
.brand-logo--nav { height: 3rem; width: auto; }
.brand-logo--hero {
  width: min(100%, 22rem);
  max-height: 22rem;
  object-fit: contain;
}
.brand-logo--about { width: min(12rem, 70%); margin: 0 auto; }
.light .brand-logo--nav { filter: none; }

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.glass {
  background: var(--color-glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--color-glass-border);
}

.glass-strong {
  background: var(--color-glass-bg);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-card);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: #fff;
  background: var(--gradient-btn);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 8px 32px var(--color-primary-glow);
  transition: transform var(--duration-base) var(--ease-out), box-shadow var(--duration-base);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px var(--color-primary-glow);
}
.btn-primary:focus-visible { outline: 2px solid var(--color-accent-cyan); outline-offset: 3px; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-link-primary);
  background: transparent;
  border: 1px solid var(--color-border-glow);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: transform var(--duration-base) var(--ease-out), background var(--duration-base), color var(--duration-base), border-color var(--duration-base), box-shadow var(--duration-base);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(168, 85, 247, 0.15);
  background: rgba(168, 85, 247, 0.12);
  border-color: var(--color-accent);
  color: var(--color-link-hover);
}

.btn-icon {
  width: 2.75rem;
  height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-glass-bg);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: border-color var(--duration-fast), background var(--duration-fast);
}
.btn-icon:hover { border-color: var(--color-accent); color: var(--color-accent-cyan); }
.btn-icon:focus-visible { outline: 2px solid var(--color-accent-cyan); outline-offset: 2px; }

.form-input {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}
.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}
.form-input::placeholder { color: var(--color-text-muted); }
.form-label { display: block; margin-bottom: 0.4rem; font-weight: 500; font-size: 0.9rem; }
.form-error { color: var(--color-error); font-size: 0.85rem; margin-top: 0.35rem; }
.form-error[hidden] { display: none; }

.tag {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: rgba(168, 85, 247, 0.15);
  color: var(--color-link-primary);
  border: 1px solid rgba(168, 85, 247, 0.25);
}

.card {
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  transition: transform var(--duration-base) var(--ease-out), box-shadow var(--duration-base), border-color var(--duration-base);
}
.card:hover {
  border-color: var(--color-border-glow);
  box-shadow: var(--shadow-glow);
}

.card-glow {
  position: relative;
  overflow: hidden;
}
.card-glow::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: var(--gradient-card);
  border-radius: inherit;
  z-index: -1;
  opacity: 0.6;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--duration-fast);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-hero);
  transition: width var(--duration-base) var(--ease-out);
}
.nav-link:hover, .nav-link.active { color: var(--color-text-primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.filter-btn {
  padding: 0.4rem 1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--gradient-btn);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}
.project-link-primary {
  background: var(--gradient-btn);
  color: #fff;
}
.project-link-secondary {
  border: 1px solid var(--color-border-glow);
  color: var(--color-link-primary);
}
.project-link:hover { transform: translateY(-2px); }

.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; margin-bottom: var(--space-sm); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: 1.15rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
}
.faq-question:hover { color: var(--color-link-primary); }
.faq-question i { color: var(--color-accent); transition: transform var(--duration-base); }
.faq-question[aria-expanded="true"] i { transform: rotate(180deg); }
.faq-answer {
  padding: 0 1.25rem 1.15rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.faq-answer[hidden] { display: none; }

.skill-bar-track {
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  overflow: hidden;
}
.skill-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--gradient-hero);
  width: 0;
}

@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;
  }
}