/* ══════════════════════════════════════════════
   KBK Beton — style.css
   Mobile-first, zero external dependencies
   ══════════════════════════════════════════════ */

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

:root {
  --c-dark:      #111827;
  --c-dark2:     #1F2937;
  --c-light:     #F3F4F6;
  --c-white:     #FFFFFF;
  --c-text:      #374151;
  --c-text-muted:#6B7280;
  --c-accent:    #F59E0B;
  --c-accent2:   #F97316;
  --c-green:     #16A34A;
  --c-border:    #E5E7EB;
  --r-card:      20px;
  --r-btn:       12px;
  --shadow-sm:   0 2px 8px rgba(0,0,0,.07);
  --shadow-md:   0 4px 20px rgba(0,0,0,.10);
  --shadow-lg:   0 8px 40px rgba(0,0,0,.14);
  --max-w:       1200px;
  --font:        -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; font-family: var(--font); }

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ─── Typography helpers ───────────────────────── */
.section-label {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--c-dark);
  line-height: 1.2;
  margin-bottom: 14px;
}
.section-sub {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  max-width: 640px;
  margin-bottom: 48px;
}
.section-center { text-align: center; }
.section-center .section-sub { margin-left: auto; margin-right: auto; }

/* ─── Buttons ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--r-btn);
  font-size: .95rem;
  font-weight: 700;
  border: none;
  transition: opacity .2s, transform .15s, box-shadow .2s;
  white-space: nowrap;
}
.btn:hover  { opacity: .88; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 3px; }

.btn-primary {
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent2));
  color: var(--c-dark);
  box-shadow: 0 4px 16px rgba(245,158,11,.35);
}
.btn-secondary {
  background: transparent;
  color: var(--c-white);
  border: 2px solid rgba(255,255,255,.35);
}
.btn-secondary:hover { border-color: var(--c-accent); color: var(--c-accent); opacity: 1; }
.btn-outline {
  background: transparent;
  color: var(--c-dark);
  border: 2px solid var(--c-border);
  font-size: .85rem;
  padding: 10px 20px;
}
.btn-outline:hover { border-color: var(--c-accent); color: var(--c-accent); opacity: 1; }

/* ─── HEADER ───────────────────────────────────── */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(17,24,39,.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: box-shadow .25s;
}
#site-header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,.35); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

.logo a {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -.01em;
}
.logo-name span { color: var(--c-accent); }
.logo-sub {
  font-size: .68rem;
  color: var(--c-text-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
}

nav#nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
nav#nav-menu a {
  color: rgba(255,255,255,.75);
  font-size: .875rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: color .2s, background .2s;
}
nav#nav-menu a:hover { color: var(--c-white); background: rgba(255,255,255,.07); }
nav#nav-menu a:focus-visible { outline: 2px solid var(--c-accent); }

.header-cta { display: flex; align-items: center; gap: 10px; }
.header-phone-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent2));
  color: var(--c-dark);
  font-weight: 700;
  font-size: .85rem;
  padding: 10px 18px;
  border-radius: 10px;
  border: none;
  text-decoration: none;
  transition: opacity .2s, transform .15s;
}
.header-phone-btn:hover { opacity: .88; transform: translateY(-1px); }
.header-phone-btn:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 3px; }

/* Hamburger */
#nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  border-radius: 8px;
}
#nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: transform .25s, opacity .2s;
}

/* ─── HERO ─────────────────────────────────────── */
#hero {
  background: linear-gradient(145deg, var(--c-dark) 0%, var(--c-dark2) 60%, #0f1929 100%);
  position: relative;
  overflow: hidden;
  padding: 80px 0 72px;
}
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 70% 50%, rgba(245,158,11,.07) 0%, transparent 65%);
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(245,158,11,.12);
  border: 1px solid rgba(245,158,11,.25);
  color: var(--c-accent);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 20px;
}
.hero-badge svg { flex-shrink: 0; }

#hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  color: var(--c-white);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin-bottom: 20px;
}
#hero h1 span { color: var(--c-accent); }

.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,.7);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 36px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 40px; }

/* Hero info panel */
.hero-info-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.hero-info-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  padding: 12px 16px;
}
.hero-info-icon {
  width: 38px;
  height: 38px;
  background: rgba(245,158,11,.12);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--c-accent);
}
.hero-info-item a { color: var(--c-accent); font-weight: 600; font-size: .95rem; }
.hero-info-item a:hover { text-decoration: underline; }
.hero-info-text small { display: block; color: rgba(255,255,255,.45); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 2px; }

/* Quick quote card */
.hero-quote-card {
  background: var(--c-white);
  border-radius: var(--r-card);
  padding: 28px 24px;
  box-shadow: var(--shadow-lg);
  height: fit-content;
  position: relative;
  overflow: hidden;
}
.hero-quote-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2));
}
.quote-card-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--c-dark);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.quote-card-title svg { color: var(--c-accent); }
.quote-fields { display: flex; flex-direction: column; gap: 10px; }
.quote-field {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--c-light);
  border-radius: 10px;
  border: 1.5px solid var(--c-border);
}
.quote-field-icon { color: var(--c-accent); flex-shrink: 0; }
.quote-field-label { font-size: .78rem; color: var(--c-text-muted); margin-bottom: 1px; }
.quote-field-value { font-size: .88rem; font-weight: 600; color: var(--c-dark); }
.quote-note {
  margin-top: 18px;
  font-size: .78rem;
  color: var(--c-text-muted);
  background: var(--c-light);
  border-radius: 10px;
  padding: 10px 14px;
  line-height: 1.55;
}

/* ─── SECTION WRAPPER ──────────────────────────── */
.section { padding: 80px 0; }
.section-alt { background: var(--c-light); }

/* ─── SERVICE CARDS ────────────────────────────── */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.service-card {
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(245,158,11,.35);
}
.service-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(245,158,11,.12), rgba(249,115,22,.08));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent);
}
.service-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-dark);
  line-height: 1.3;
}
.service-card p { font-size: .88rem; color: var(--c-text-muted); line-height: 1.65; flex: 1; }
.service-link {
  font-size: .82rem;
  font-weight: 600;
  color: var(--c-accent);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: gap .2s;
  margin-top: auto;
}
.service-link:hover { gap: 8px; }
.service-link svg { flex-shrink: 0; }

/* ─── HOW TO ORDER ─────────────────────────────── */
.steps-timeline { display: flex; flex-direction: column; gap: 0; }
.step-item {
  display: flex;
  gap: 20px;
  position: relative;
}
.step-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 23px;
  top: 52px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-accent), rgba(245,158,11,.1));
}
.step-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  font-weight: 800;
  color: var(--c-dark);
  z-index: 1;
  margin-top: 2px;
}
.step-body { padding-bottom: 36px; }
.step-body h3 { font-size: 1rem; font-weight: 700; color: var(--c-dark); margin-bottom: 4px; }
.step-body p  { font-size: .875rem; color: var(--c-text-muted); }

/* ─── CONCRETE CLASSES ─────────────────────────── */
.classes-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}
.class-pill {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: var(--c-white);
  border: 2px solid var(--c-border);
  border-radius: 14px;
  padding: 14px 20px;
  min-width: 110px;
  transition: border-color .2s, box-shadow .2s;
  box-shadow: var(--shadow-sm);
}
.class-pill:hover { border-color: var(--c-accent); box-shadow: 0 4px 16px rgba(245,158,11,.18); }
.class-pill-main { font-size: 1rem; font-weight: 800; color: var(--c-dark); }
.class-pill-sub  { font-size: .72rem; color: var(--c-text-muted); margin-top: 2px; }
.classes-note {
  background: var(--c-white);
  border-left: 4px solid var(--c-accent);
  border-radius: 0 12px 12px 0;
  padding: 14px 18px;
  font-size: .88rem;
  color: var(--c-text-muted);
  line-height: 1.6;
}

/* ─── USAGE GRID ───────────────────────────────── */
.usage-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.usage-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: .875rem;
  font-weight: 600;
  color: var(--c-dark);
  transition: border-color .2s, box-shadow .2s;
}
.usage-item:hover { border-color: var(--c-accent); box-shadow: var(--shadow-sm); }
.usage-item svg { color: var(--c-accent); flex-shrink: 0; }

/* ─── PREFABS ──────────────────────────────────── */
.prefabs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 24px;
}
.prefab-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--c-white);
  border-radius: 12px;
  padding: 14px 18px;
  border: 1.5px solid var(--c-border);
  font-size: .9rem;
  color: var(--c-text);
}
.prefab-item svg { color: var(--c-accent); flex-shrink: 0; }
.prefabs-note {
  background: var(--c-light);
  border-radius: 14px;
  padding: 16px 20px;
  font-size: .875rem;
  color: var(--c-text-muted);
}

/* ─── WHY US ───────────────────────────────────── */
.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.why-card {
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  padding: 24px 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: box-shadow .2s, border-color .2s;
}
.why-card:hover { box-shadow: var(--shadow-md); border-color: rgba(22,163,74,.35); }
.why-icon {
  width: 46px;
  height: 46px;
  background: rgba(22,163,74,.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-green);
  flex-shrink: 0;
}
.why-body h3 { font-size: .95rem; font-weight: 700; color: var(--c-dark); margin-bottom: 4px; }
.why-body p  { font-size: .84rem; color: var(--c-text-muted); }

/* ─── FAQ ──────────────────────────────────────── */
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item {
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color .2s;
}
.faq-item.open { border-color: rgba(245,158,11,.4); }
.faq-question {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  text-align: left;
  font-size: .92rem;
  font-weight: 600;
  color: var(--c-dark);
  cursor: pointer;
  transition: color .2s;
}
.faq-item.open .faq-question { color: var(--c-accent2); }
.faq-question:focus-visible { outline: 2px solid var(--c-accent); outline-offset: -2px; }
.faq-icon { flex-shrink: 0; color: var(--c-text-muted); transition: transform .3s, color .2s; }
.faq-item.open .faq-icon { transform: rotate(45deg); color: var(--c-accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .25s;
}
.faq-item.open .faq-answer { max-height: 400px; }
.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: .875rem;
  color: var(--c-text-muted);
  line-height: 1.7;
}

/* ─── CONTACT ──────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.contact-info-card {
  background: linear-gradient(145deg, var(--c-dark), var(--c-dark2));
  border-radius: var(--r-card);
  padding: 32px 28px;
  color: var(--c-white);
}
.contact-info-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 24px;
  color: var(--c-white);
}
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.contact-detail-icon {
  width: 40px;
  height: 40px;
  background: rgba(245,158,11,.14);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent);
  flex-shrink: 0;
}
.contact-detail-text small { display: block; font-size: .7rem; color: rgba(255,255,255,.45); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 2px; }
.contact-detail-text a { color: var(--c-white); font-weight: 600; font-size: .95rem; }
.contact-detail-text a:hover { color: var(--c-accent); }
.contact-detail-text span { color: var(--c-white); font-weight: 600; font-size: .92rem; }
.contact-note {
  margin-top: 24px;
  background: rgba(22,163,74,.12);
  border: 1px solid rgba(22,163,74,.25);
  border-radius: 12px;
  padding: 12px 16px;
  font-size: .82rem;
  color: rgba(255,255,255,.8);
  display: flex;
  align-items: center;
  gap: 9px;
}
.contact-note svg { color: var(--c-green); flex-shrink: 0; }

.contact-form-card {
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-md);
}
.contact-form-card h3 { font-size: 1.1rem; font-weight: 800; color: var(--c-dark); margin-bottom: 24px; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-group label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--c-dark);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--c-border);
  border-radius: 10px;
  font-size: .9rem;
  font-family: var(--font);
  color: var(--c-dark);
  background: var(--c-light);
  transition: border-color .2s, box-shadow .2s;
  outline: none;
  appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(245,158,11,.15);
  background: var(--c-white);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit {
  margin-top: 6px;
  width: 100%;
  display: flex;
  justify-content: center;
}
.form-submit .btn { width: 100%; justify-content: center; }

/* ─── FOOTER ───────────────────────────────────── */
footer {
  background: var(--c-dark);
  color: rgba(255,255,255,.7);
  padding: 56px 0 32px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 40px;
}
.footer-brand .logo-name { font-size: 1.3rem; }
.footer-brand .logo-sub  { font-size: .7rem; }
.footer-tagline {
  margin-top: 10px;
  font-size: .85rem;
  color: rgba(255,255,255,.45);
  line-height: 1.6;
}
.footer-col h4 {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
  margin-bottom: 14px;
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  color: rgba(255,255,255,.65);
  font-size: .875rem;
  transition: color .2s;
}
.footer-col ul li a:hover { color: var(--c-accent); }
.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 10px;
  font-size: .875rem;
  color: rgba(255,255,255,.65);
}
.footer-contact-item svg { color: var(--c-accent); flex-shrink: 0; }
.footer-contact-item a { color: rgba(255,255,255,.65); transition: color .2s; }
.footer-contact-item a:hover { color: var(--c-accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.07);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: .78rem;
  color: rgba(255,255,255,.35);
}
.footer-bottom a { color: rgba(255,255,255,.5); }
.footer-bottom a:hover { color: var(--c-accent); }

/* ─── MOBILE STICKY BAR ────────────────────────── */
.sticky-bar {
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background: var(--c-dark);
  border-top: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 -4px 20px rgba(0,0,0,.25);
}
.sticky-bar a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 12px;
  font-size: .88rem;
  font-weight: 700;
  color: var(--c-white);
  transition: background .2s;
}
.sticky-bar a:first-child {
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2));
  color: var(--c-dark);
}
.sticky-bar a:last-child { background: var(--c-dark2); }
.sticky-bar a:hover { opacity: .9; }
.sticky-bar a:focus-visible { outline: 2px solid var(--c-accent); outline-offset: -2px; }

/* body bottom padding for sticky bar */
body { padding-bottom: 60px; }

/* ══════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════ */

/* 600px+ ─────────────────────────────────────── */
@media (min-width: 600px) {
  .services-grid { grid-template-columns: 1fr 1fr; }
  .usage-grid    { grid-template-columns: repeat(3, 1fr); }
  .why-grid      { grid-template-columns: 1fr 1fr; }
  .prefabs-grid  { grid-template-columns: 1fr 1fr; }
  .form-grid     { grid-template-columns: 1fr 1fr; }
  .form-group.full { grid-column: 1 / -1; }
}

/* 900px+ ─────────────────────────────────────── */
@media (min-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr 400px;
    align-items: center;
  }
  .services-grid { grid-template-columns: repeat(3, 1fr); }
  .contact-grid  { grid-template-columns: 1fr 1.4fr; }
  .footer-inner  { grid-template-columns: 1.6fr 1fr 1.2fr; }
  .why-grid      { grid-template-columns: repeat(3, 1fr); }
}

/* 1024px+ ────────────────────────────────────── */
@media (min-width: 1024px) {
  nav#nav-menu { display: flex !important; }
  #nav-toggle  { display: none !important; }
  body         { padding-bottom: 0; }
  .sticky-bar  { display: none; }
  .footer-inner { grid-template-columns: 2fr 1fr 1.4fr; }
}

/* Mobile nav open state */
@media (max-width: 1023px) {
  #nav-toggle { display: flex; }
  nav#nav-menu {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(17,24,39,.98);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,.07);
    gap: 2px;
  }
  nav#nav-menu.open { display: flex; }
  nav#nav-menu a {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 10px;
  }
  .header-inner { position: relative; }

  .hero-actions { flex-direction: column; align-items: flex-start; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}

@media (max-width: 599px) {
  .classes-grid { justify-content: center; }
  .usage-grid   { grid-template-columns: 1fr 1fr; }
  .section      { padding: 56px 0; }
}