/* ============================================================
   AIOpenAcademyLA — styles.css
   Mobile-first, dark theme, modern UI
   ============================================================ */

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
  /* Colors */
  --bg-primary:    #000000;
  --bg-secondary:  #0a0a0a;
  --bg-card:       #111111;
  --bg-card-hover: #161616;
  --text-primary:  #ffffff;
  --text-secondary:#b3b3b3;
  --text-muted:    #666666;
  --accent:        #00ff88;
  --accent-dim:    rgba(0, 255, 136, 0.12);
  --accent-glow:   rgba(0, 255, 136, 0.35);
  --border:        rgba(255, 255, 255, 0.08);
  --border-accent: rgba(0, 255, 136, 0.3);
  --error:         #ff4d4d;
  --error-bg:      rgba(255, 77, 77, 0.1);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.6);
  --shadow-accent: 0 0 24px var(--accent-glow);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;

  /* Layout */
  --container-max: 1200px;
  --navbar-h: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
}

/* ── Accessibility ──────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ── Utility ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.accent { color: var(--accent); }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition-normal);
  white-space: nowrap;
  cursor: pointer;
}

.btn--accent {
  background: var(--accent);
  color: #000;
}
.btn--accent:hover {
  background: #00e87a;
  box-shadow: var(--shadow-accent);
  transform: translateY(-1px);
}
.btn--accent:active { transform: translateY(0); }

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.btn--sm  { padding: 0.4rem 0.9rem; font-size: 0.8rem; }
.btn--lg  { padding: 0.8rem 1.75rem; font-size: 1rem; }
.btn--full { width: 100%; justify-content: center; }

/* ── Section Shared ─────────────────────────────────────────── */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-inline: auto;
  line-height: 1.7;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--navbar-h);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-normal);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
}
.navbar__logo:hover { opacity: 0.85; }

.navbar__logo-icon {
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
}

.navbar__menu {
  display: none;
  flex-direction: column;
  position: absolute;
  top: var(--navbar-h);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4);
  gap: var(--space-2);
}

.navbar__menu--open {
  display: flex;
}

.navbar__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.navbar__link:hover {
  color: var(--text-primary);
  background: var(--border);
}

.navbar__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}
.navbar__toggle:hover { background: var(--border); }

.navbar__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--navbar-h);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}
.hero__glow--1 {
  width: 500px;
  height: 500px;
  background: var(--accent);
  top: -100px;
  right: -100px;
  animation: float 8s ease-in-out infinite;
}
.hero__glow--2 {
  width: 350px;
  height: 350px;
  background: #0088ff;
  bottom: -50px;
  left: -80px;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-30px) scale(1.05); }
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-16);
  max-width: 700px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-8);
  max-width: 560px;
}
.hero__subtitle strong { color: var(--text-primary); }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
}

.hero__stats {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero__stat-number {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.hero__stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__stat-divider {
  width: 1px;
  height: 32px;
  background: var(--border);
}

/* ── Services ───────────────────────────────────────────────── */
.services {
  padding-block: var(--space-24);
  background: var(--bg-secondary);
}

.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.service-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: border-color var(--transition-normal), background var(--transition-normal), transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.service-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0,255,136,0.06);
}

.service-card--featured {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, #0d1a12 0%, var(--bg-card) 100%);
}
.service-card--featured:hover {
  box-shadow: var(--shadow-lg), var(--shadow-accent);
}

.service-card__badge {
  position: absolute;
  top: -12px;
  left: var(--space-8);
  background: var(--accent);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 12px;
  border-radius: var(--radius-full);
}

.service-card__icon {
  width: 56px;
  height: 56px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}
.service-card:hover .service-card__icon {
  background: rgba(0,255,136,0.18);
  box-shadow: 0 0 16px var(--accent-glow);
}

.service-card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.service-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.service-card__description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}

.service-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.service-card__features li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: var(--space-4);
  position: relative;
}
.service-card__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.service-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: var(--space-2);
  transition: gap var(--transition-fast);
}
.service-card__cta:hover { gap: var(--space-3); }

/* ── Contact ─────────────────────────────────────────────────── */
.contact {
  padding-block: var(--space-24);
  background: var(--bg-primary);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.contact__item-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact__item-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}

.contact__item-value {
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}
a.contact__item-value:hover { color: var(--accent); }

.contact__social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.contact__social-link {
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}
.contact__social-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
}

/* ── Form ────────────────────────────────────────────────────── */
.contact__form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

.form-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  padding: 0.7rem 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}
.form-select option { background: var(--bg-card); }

.form-textarea { resize: vertical; min-height: 100px; }

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding-block: var(--space-12) var(--space-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer__tagline {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: var(--space-3);
  max-width: 260px;
}

.footer__nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.footer__nav-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.footer__link:hover { color: var(--accent); }

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

.footer__copyright,
.footer__made-with {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Chat Interface ──────────────────────────────────────────── */
.chat {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  top: auto;
  width: 100%;
  height: 85%;
  max-height: 85%;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom: none;
  box-shadow: 0 -8px 32px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  z-index: 200;
  overflow: hidden;
  opacity: 0;
  transform: translateY(100%);
  pointer-events: none;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  padding-bottom: env(safe-area-inset-bottom);
}

.chat--open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* When keyboard is visible on mobile, allow chat to shrink */
@media (max-width: 1023px) {
  .chat--open {
    height: auto;
    max-height: calc(100% - var(--navbar-h));
    top: var(--navbar-h);
    bottom: 0;
    border-radius: 0;
    overflow-y: auto;
  }
}

.chat__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.chat__header-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.chat__avatar {
  position: relative;
  width: 36px;
  height: 36px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.chat__status-dot {
  position: absolute;
  bottom: 1px;
  right: 1px;
  width: 9px;
  height: 9px;
  background: var(--accent);
  border-radius: 50%;
  border: 2px solid var(--bg-secondary);
}

.chat__title {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
}

.chat__subtitle {
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 500;
}

.chat__close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}
.chat__close:hover {
  background: var(--border);
  color: var(--text-primary);
}

.chat__messages {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  scroll-behavior: smooth;
  min-height: 0; /* critical for flex shrink */
}

.chat__messages::-webkit-scrollbar { width: 4px; }
.chat__messages::-webkit-scrollbar-track { background: transparent; }
.chat__messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.chat__message {
  display: flex;
  max-width: 88%;
}

.chat__message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat__message--assistant {
  align-self: flex-start;
}

.chat__bubble {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  line-height: 1.6;
}

.chat__message--user .chat__bubble {
  background: var(--accent);
  color: #000;
  border-bottom-right-radius: var(--radius-sm);
  font-weight: 500;
}

.chat__message--assistant .chat__bubble {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-bottom-left-radius: var(--radius-sm);
}

.chat__loading {
  padding: var(--space-3) var(--space-6);
  flex-shrink: 0;
}

.chat__loading-dots {
  display: flex;
  gap: 4px;
  align-items: center;
}

.chat__loading-dots span {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: dot-bounce 1.2s ease-in-out infinite;
}
.chat__loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.chat__loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dot-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40%            { transform: translateY(-6px); opacity: 1; }
}

.chat__error {
  margin: 0 var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--error-bg);
  border: 1px solid rgba(255,77,77,0.3);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--error);
  flex-shrink: 0;
}

.chat__form {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  flex-shrink: 0;
  width: 100%;
  box-sizing: border-box;
}

.chat__input {
  flex: 1;
  min-width: 0; /* critical — prevents input from overflowing */
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 0.875rem;
  padding: 0.55rem 1rem;
  transition: border-color var(--transition-fast);
}
.chat__input::placeholder { color: var(--text-muted); }
.chat__input:focus {
  outline: none;
  border-color: var(--accent);
}

.chat__send {
  width: 36px;
  height: 36px;
  min-width: 36px; /* prevent shrinking */
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}
.chat__send:hover {
  background: #00e87a;
  transform: scale(1.08);
}
.chat__send:active { transform: scale(0.96); }

/* ── Chat FAB ────────────────────────────────────────────────── */
.chat__fab {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-4);
  width: 56px;
  height: 56px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  z-index: 300; /* higher than chat */
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: all var(--transition-normal);
  cursor: pointer; /* required for iOS Safari */
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.chat__fab:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 28px var(--accent-glow);
}
.chat__fab:active { transform: scale(0.95); }

.chat__fab-icon--close { display: none; }
.chat__fab--open .chat__fab-icon--open  { display: none; }
.chat__fab--open .chat__fab-icon--close { display: block; }

/* Hide FAB when chat is open on mobile */
@media (max-width: 1023px) {
  .chat__fab--open {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
    pointer-events: none !important;
  }
}

/* ============================================================
   RESPONSIVE BREAKPOINTS — Mobile-first
   ============================================================ */

/* ── Tablet: 768px+ ─────────────────────────────────────────── */
@media (min-width: 768px) {
  .container { padding-inline: var(--space-8); }

  /* Navbar */
  .navbar__toggle { display: none; }
  .navbar__menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    position: static;
    background: none;
    border: none;
    padding: 0;
    gap: var(--space-2);
  }

  /* Hero */
  .hero__content { padding-block: var(--space-24); }

  /* Services */
  .services__grid { grid-template-columns: repeat(2, 1fr); }

  /* Contact */
  .contact__grid { grid-template-columns: 1fr 1fr; align-items: start; }

  /* Footer */
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* ── Desktop: 1024px+ ───────────────────────────────────────── */
@media (min-width: 1024px) {
  .container { padding-inline: var(--space-12); }

  /* Services */
  .services__grid { grid-template-columns: repeat(3, 1fr); }

  /* Footer */
  .footer__grid { grid-template-columns: 1fr auto; gap: var(--space-16); }

  /* Chat — floating panel on desktop */
  .chat {
    top: auto;
    left: auto;
    bottom: calc(var(--space-6) + 72px);
    right: var(--space-8);
    width: 380px;
    height: auto;
    max-height: min(560px, calc(100svh - 120px));
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(16px) scale(0.97);
  }
  .chat--open {
    transform: translateY(0) scale(1);
  }
  .chat__fab { right: var(--space-8); }
}

/* ── Large Desktop: 1440px+ ─────────────────────────────────── */
@media (min-width: 1440px) {
  :root { --container-max: 1320px; }

  .hero__title { font-size: 5.5rem; }
  .section-title { font-size: 3rem; }
}

/* ── Reduced Motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ── High Contrast ──────────────────────────────────────────── */
@media (forced-colors: active) {
  .btn--accent { forced-color-adjust: none; }
  .service-card { border: 2px solid ButtonText; }
}