/* ============================================================
   UrsFusionTech — style.css
   Design system: CSS custom properties → components → sections
   ============================================================ */

/* ============================================================
   1. CUSTOM PROPERTIES (THEME ENGINE)
   ============================================================ */
:root {
  /* Dark theme (default) */
  --bg:              #0A0A0A;
  --bg-alt:          #111111;
  --bg-card:         #0E0E0E;
  --fg:              #FFFFFF;
  --fg-muted:        rgba(255, 255, 255, 0.55);
  --fg-subtle:       rgba(255, 255, 255, 0.25);
  --accent:          #0ABFB8;
  --accent-dim:      rgba(10, 191, 184, 0.15);
  --accent-glow:     rgba(10, 191, 184, 0.35);
  --glass-bg:        rgba(255, 255, 255, 0.04);
  --glass-border:    rgba(255, 255, 255, 0.08);
  --glass-shine:     rgba(255, 255, 255, 0.06);
  --shadow-card:     0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-accent:   0 0 40px rgba(10, 191, 184, 0.15);
  --nav-bg:          rgba(10, 10, 10, 0.80);
  --input-bg:        rgba(255, 255, 255, 0.05);
  --input-border:    rgba(255, 255, 255, 0.12);
  --tag-bg:          rgba(10, 191, 184, 0.12);
  --tag-fg:          #0ABFB8;

  /* Typography */
  --font:            'Inter', system-ui, -apple-system, 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:        1.875rem;
  --text-4xl:        2.25rem;
  --text-5xl:        3rem;
  --text-6xl:        3.75rem;
  --text-7xl:        4.5rem;
  --text-hero:       clamp(2.5rem, 8vw, 6rem);

  /* Spacing */
  --space-xs:        0.5rem;
  --space-sm:        1rem;
  --space-md:        1.5rem;
  --space-lg:        2.5rem;
  --space-xl:        4rem;
  --space-2xl:       6rem;
  --space-3xl:       8rem;

  /* Layout */
  --container:       1200px;
  --nav-h:           72px;
  --radius-sm:       6px;
  --radius-md:       12px;
  --radius-lg:       20px;
  --radius-xl:       28px;

  /* Transitions */
  --ease:            cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce:     cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:        150ms;
  --dur-base:        300ms;
  --dur-slow:        500ms;
}

[data-theme="light"] {
  --bg:              #F8F8F8;
  --bg-alt:          #F0F0F0;
  --bg-card:         #FFFFFF;
  --fg:              #0A0A0A;
  --fg-muted:        rgba(10, 10, 10, 0.55);
  --fg-subtle:       rgba(10, 10, 10, 0.25);
  --accent:          #0ABFB8;
  --accent-dim:      rgba(10, 191, 184, 0.12);
  --accent-glow:     rgba(10, 191, 184, 0.25);
  --glass-bg:        rgba(255, 255, 255, 0.70);
  --glass-border:    rgba(10, 10, 10, 0.08);
  --glass-shine:     rgba(255, 255, 255, 0.90);
  --shadow-card:     0 8px 32px rgba(0, 0, 0, 0.10);
  --shadow-accent:   0 0 40px rgba(10, 191, 184, 0.10);
  --nav-bg:          rgba(248, 248, 248, 0.85);
  --input-bg:        rgba(10, 10, 10, 0.04);
  --input-border:    rgba(10, 10, 10, 0.12);
  --tag-bg:          rgba(10, 191, 184, 0.10);
  --tag-fg:          #089b95;
}


/* ============================================================
   2. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Ensure [hidden] always wins over any display property */
[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--dur-slow) var(--ease),
              color var(--dur-slow) var(--ease);
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* Reduced motion — disable all animations */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}


/* ============================================================
   3. UTILITY CLASSES
   ============================================================ */
.accent        { color: var(--accent); }
.container     { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--space-md); }
.section       { padding-block: var(--space-3xl); }
.glass         {
  background:    var(--glass-bg);
  border:        1px solid var(--glass-border);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
}

/* Section labels */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.section-title {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.section-sub {
  font-size: var(--text-lg);
  color: var(--fg-muted);
  max-width: 56ch;
  margin-bottom: var(--space-xl);
}


/* ============================================================
   4. SCROLL ENTRANCE ANIMATIONS
   ============================================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease),
              transform var(--dur-slow) var(--ease);
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children inside a card */
.competence-card[data-animate]:nth-child(1) { transition-delay: 0ms;   }
.competence-card[data-animate]:nth-child(2) { transition-delay: 80ms;  }
.competence-card[data-animate]:nth-child(3) { transition-delay: 160ms; }
.competence-card[data-animate]:nth-child(4) { transition-delay: 240ms; }
.competence-card[data-animate]:nth-child(5) { transition-delay: 320ms; }


/* ============================================================
   5. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.85rem 2rem;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-md);
  transition: transform var(--dur-base) var(--ease),
              box-shadow var(--dur-base) var(--ease),
              background var(--dur-base) var(--ease);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glass-shine) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease);
}
.btn:hover::before { opacity: 1; }

.btn--primary {
  background: var(--accent);
  color: #0A0A0A;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}
.btn--primary:active { transform: translateY(0); }

.btn--full { width: 100%; }

.btn__spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(10, 10, 10, 0.3);
  border-top-color: #0A0A0A;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }


/* ============================================================
   6. NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  transition: transform var(--dur-base) var(--ease),
              background var(--dur-slow) var(--ease),
              border-color var(--dur-slow) var(--ease);
}


.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-md);
  gap: var(--space-lg);
}

.nav__logo {
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: 0.06em;
  white-space: nowrap;
  flex-shrink: 0;
  transition: opacity var(--dur-fast);
}
.nav__logo:hover { opacity: 0.8; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--fg-muted);
  letter-spacing: 0.02em;
  position: relative;
  transition: color var(--dur-base) var(--ease);
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--dur-base) var(--ease);
}
.nav__link:hover,
.nav__link.active {
  color: var(--fg);
}
.nav__link.active::after,
.nav__link:hover::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ---- Language Selector ---- */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 40px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--fg-muted);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: color var(--dur-base), background var(--dur-base), transform var(--dur-base) var(--ease-bounce);
  white-space: nowrap;
}
.lang-btn:hover { color: var(--accent); transform: scale(1.03); }

.lang-flag { font-size: 1rem; line-height: 1; }
.lang-code { font-size: var(--text-xs); }

.lang-chevron {
  color: var(--fg-subtle);
  transition: transform var(--dur-base) var(--ease);
  flex-shrink: 0;
}
.lang-selector.open .lang-chevron { transform: rotate(180deg); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 160px;
  background: var(--nav-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  /* Hidden by default */
  opacity: 0;
  transform: translateY(-6px) scale(0.97);
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease),
              transform var(--dur-base) var(--ease);
  z-index: 200;
}
.lang-selector.open .lang-dropdown {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 14px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--fg-muted);
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--glass-border);
  transition: color var(--dur-fast), background var(--dur-fast);
}
.lang-option:last-child { border-bottom: none; }
.lang-option:hover,
.lang-option[aria-selected="true"] {
  color: var(--accent);
  background: var(--accent-dim);
}
.lang-option span { flex: 1; }

/* Theme toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-muted);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: color var(--dur-base), background var(--dur-base), transform var(--dur-base) var(--ease-bounce);
}
.theme-toggle:hover {
  color: var(--accent);
  transform: scale(1.05);
}

/* Icon visibility by theme */
[data-theme="dark"]  .icon--moon { display: none; }
[data-theme="light"] .icon--sun  { display: none; }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.nav__hamburger span {
  display: block;
  height: 1.5px;
  background: var(--fg);
  border-radius: 2px;
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-base);
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile menu */
.nav__mobile {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--nav-bg);
  border-top: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--dur-slow) var(--ease);
}
.nav__mobile.open {
  max-height: 320px;
}

.nav__mobile-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--glass-border);
  transition: color var(--dur-fast), background var(--dur-fast);
}
.nav__mobile-link:hover,
.nav__mobile-link.active {
  color: var(--accent);
  background: var(--accent-dim);
}


/* ============================================================
   7. HERO
   ============================================================ */
.hero {
  position: relative;
  height: 100dvh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg);
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-md);
  will-change: transform;
}

.hero__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--fg) 60%, var(--fg-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
/* The accent span inside gradient text needs special treatment */
.hero__title .accent {
  -webkit-text-fill-color: var(--accent);
  background: none;
}

.hero__tagline {
  font-size: clamp(var(--text-sm), 2vw, var(--text-xl));
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  margin-bottom: var(--space-md);
}

.cursor {
  display: inline-block;
  color: var(--accent);
  animation: blink 1.1s step-end infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.hero__sub {
  font-size: clamp(var(--text-base), 1.5vw, var(--text-lg));
  color: var(--fg-muted);
  max-width: 50ch;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--fg-subtle);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  z-index: 2;
  animation: fadeInUp 1s var(--ease) 1.2s both;
}
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50%       { opacity: 1;   transform: scaleY(0.7); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(16px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}


/* ============================================================
   8. ABOUT
   ============================================================ */
.about {
  background: var(--bg-alt);
  position: relative;
  overflow: hidden;
}

/* Subtle radial accent behind the section */
.about::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about__headline {
  font-size: clamp(var(--text-2xl), 3.5vw, var(--text-4xl));
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
}

.about__copy p {
  color: var(--fg-muted);
  margin-bottom: var(--space-md);
  font-size: var(--text-lg);
  line-height: 1.8;
}
.about__copy p:last-child { margin-bottom: 0; }

/* Stats card */
.about__glass-card {
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  z-index: 1;
}

.about__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about__stat-number {
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
}

.about__stat-suffix {
  font-size: var(--text-xl);
}

.about__stat-label {
  font-size: var(--text-sm);
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}

.about__divider {
  height: 1px;
  background: var(--glass-border);
  margin-block: var(--space-lg);
}

/* Decorative geometry */
.about__accent-block {
  position: relative;
}

.about__geo {
  position: absolute;
  bottom: -60px;
  right: -40px;
  pointer-events: none;
  z-index: 0;
}
.about__geo-ring {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 1px solid var(--accent-dim);
  animation: rotateSlow 20s linear infinite;
}
.about__geo-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}
@keyframes rotateSlow { to { transform: rotate(360deg); } }


/* ============================================================
   9. COMPETENCES
   ============================================================ */
.competences {
  background: var(--bg);
  position: relative;
  overflow: hidden;
}

.competences::before {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
}

.competences__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
}

/* ---- Competence Card ---- */
.competence-card {
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  cursor: default;
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  transition: box-shadow var(--dur-base) var(--ease),
              border-color var(--dur-base) var(--ease);
  /* 3D tilt is applied via JS inline styles */
}

/* Glass shine gradient overlay */
.competence-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glass-shine) 0%, transparent 50%);
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease);
}
.competence-card:hover::before { opacity: 1; }

.competence-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  border: 1px solid rgba(10, 191, 184, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  transition: background var(--dur-base), transform var(--dur-base) var(--ease-bounce);
}
.competence-card:hover .competence-card__icon {
  background: rgba(10, 191, 184, 0.20);
  transform: translateZ(8px) scale(1.05);
}

.competence-card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.competence-card__desc {
  font-size: var(--text-sm);
  color: var(--fg-muted);
  line-height: 1.7;
  flex: 1;
}

.competence-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: auto;
  padding-top: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  background: var(--tag-bg);
  color: var(--tag-fg);
  border: 1px solid rgba(10, 191, 184, 0.2);
}


/* ============================================================
   10. CONTACT
   ============================================================ */
.contact {
  background: var(--bg-alt);
  position: relative;
  overflow: hidden;
}

.contact::before {
  content: '';
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
}

.contact__wrapper {
  max-width: 680px;
  margin-inline: auto;
}

.contact__card {
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
}

/* Success state */
.contact__success {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-md);
  padding: var(--space-xl) 0;
}
.contact__success-icon { color: var(--accent); }
.contact__success h3 {
  font-size: var(--text-2xl);
  font-weight: 700;
}
.contact__success p {
  color: var(--fg-muted);
  font-size: var(--text-lg);
}

/* Honeypot — visually hidden */
.contact__honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Form layout */
.contact__form { display: flex; flex-direction: column; gap: var(--space-md); }

.form-row { display: grid; gap: var(--space-md); }
.form-row--2 { grid-template-columns: 1fr 1fr; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--fg-muted);
  letter-spacing: 0.02em;
}
.form-label span { color: var(--accent); }

.form-input {
  font-family: var(--font);
  font-size: var(--text-base);
  color: var(--fg);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color var(--dur-base) var(--ease),
              box-shadow var(--dur-base) var(--ease),
              background var(--dur-slow) var(--ease);
  outline: none;
  -webkit-appearance: none;
}
.form-input::placeholder { color: var(--fg-subtle); }
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-input.invalid {
  border-color: #e05260;
  box-shadow: 0 0 0 3px rgba(224, 82, 96, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.form-error {
  font-size: var(--text-xs);
  color: #e05260;
  min-height: 1em;
}

/* hCaptcha dark/light sync */
.h-captcha { display: flex; justify-content: center; }

.contact__privacy {
  font-size: var(--text-xs);
  color: var(--fg-subtle);
  text-align: center;
  margin-top: var(--space-xs);
}


/* ============================================================
   11. FOOTER
   ============================================================ */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--glass-border);
  padding-block: var(--space-xl);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

.footer__logo {
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: 0.06em;
  opacity: 0.85;
  transition: opacity var(--dur-fast);
}
.footer__logo:hover { opacity: 1; }

.footer__tagline {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  text-transform: uppercase;
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--fg-subtle);
}


/* ============================================================
   12. RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .about__accent-block {
    order: -1;
  }
  .about__geo { display: none; }
}

@media (max-width: 768px) {
  :root { --nav-h: 64px; }

  .nav__links    { display: none; }
  .nav__hamburger { display: flex; }
  .nav__mobile   { display: flex; }

  .form-row--2 { grid-template-columns: 1fr; }

  .hero__title { letter-spacing: -0.02em; }

  .section { padding-block: var(--space-2xl); }
  .contact__card { padding: var(--space-lg); }

  .competences__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero__sub { font-size: var(--text-base); }
  .about__glass-card { padding: var(--space-lg); }
  .about__stat-number { font-size: var(--text-2xl); }
}

/* Focus-visible for keyboard users */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}