/* ═══════════════════════════════════════════════════════════
   AMERICAN GLASS EXPERTS — style.css
   Premium white default + dark toggle
   ═══════════════════════════════════════════════════════════ */

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
img { max-width: 100%; display: block; }
a { text-decoration: none; }
ul { list-style: none; }

/* ── LIGHT THEME ── */
:root {
  --bg:          #ffffff;
  --bg-soft:     #f7f8fa;
  --bg-card:     #ffffff;
  --bg-nav:      rgba(255,255,255,0.97);
  --surface:     #eef0f4;
  --border:      #e2e6ea;
  --border-md:   #c8cdd4;

  --blue:        #4a90d9;
  --blue-dk:     #3a7bc8;
  --blue-lt:     #6aaee8;
  --blue-dim:    rgba(74,144,217,0.08);
  --blue-glow:   rgba(74,144,217,0.22);

  --coal:        #0f172a;
  --charcoal:    #1e293b;
  --text:        #374151;
  --text-mid:    #6b7280;
  --text-dim:    #9ca3af;
  --white:       #ffffff;

  --sh-sm: 0 1px 4px rgba(0,0,0,0.07);
  --sh-md: 0 4px 20px rgba(0,0,0,0.09);
  --sh-lg: 0 16px 48px rgba(0,0,0,0.13);
  --sh-xl: 0 32px 80px rgba(0,0,0,0.18);

  --head: 'Playfair Display', Georgia, serif;
  --body: 'DM Sans', system-ui, sans-serif;
  --r:    6px;
  --r-lg: 16px;
  --t:    0.22s ease;
}

/* ── DARK THEME ── */
[data-theme="dark"] {
  --bg:          #0d1117;
  --bg-soft:     #182035;
  --bg-card:     #1a2332;
  --bg-nav:      rgba(13,17,23,0.97);
  --surface:     #1e2d42;
  --border:      rgba(74,144,217,0.14);
  --border-md:   rgba(74,144,217,0.32);

  --blue:        #4a90d9;
  --blue-dk:     #3a7bc8;
  --blue-lt:     #6aaee8;
  --blue-dim:    rgba(74,144,217,0.12);
  --blue-glow:   rgba(74,144,217,0.28);

  --coal:        #f0f4f8;
  --charcoal:    #e2eaf4;
  --text:        #a8b8cc;
  --text-mid:    #7a8fa3;
  --text-dim:    #4a6070;
  --white:       #f0f4f8;

  --sh-sm: 0 1px 4px rgba(0,0,0,0.3);
  --sh-md: 0 4px 20px rgba(0,0,0,0.4);
  --sh-lg: 0 16px 48px rgba(0,0,0,0.5);
  --sh-xl: 0 32px 80px rgba(0,0,0,0.6);
}

body {
  font-family: var(--body); font-weight: 400;
  color: var(--text); background: var(--bg);
  transition: background var(--t), color var(--t);
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--head); color: var(--coal); line-height: 1.25; }
h2 { font-size: clamp(1.9rem,3.5vw,3.2rem); }
h3 { font-size: clamp(1.3rem,2vw,1.75rem); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 48px; }
section { padding: 88px 0; }

.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 16px;
}
.section-label::before {
  content: '';
  display: block; width: 20px; height: 2px; background: var(--blue); border-radius: 1px;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--body); font-size: 0.83rem; font-weight: 600;
  letter-spacing: 0.04em; padding: 13px 28px; border-radius: var(--r);
  border: none; cursor: pointer; transition: all var(--t); white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 2px 12px var(--blue-glow); }
.btn-primary:hover { background: var(--blue-dk); box-shadow: 0 6px 24px var(--blue-glow); }
.btn-outline { background: transparent; border: 1.5px solid var(--border-md); color: var(--text); }
.btn-outline:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-dim); }

/* ── TOP BAR ── */
.top-bar {
  background: #0c1117;
  padding: 10px 48px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.78rem; font-weight: 500; color: rgba(255,255,255,0.7);
}
[data-theme="dark"] .top-bar { background: var(--bg-soft); border-bottom: 1px solid var(--border); }
.top-bar a { color: rgba(255,255,255,0.85); display: flex; align-items: center; gap: 7px; transition: color var(--t); }
.top-bar a:hover { color: #fff; }
.top-bar-phone { font-size: 0.88rem; font-weight: 700; color: #fff; }
.top-bar-right { display: flex; gap: 24px; align-items: center; }

/* ── NAV ── */
.nav {
  position: sticky; top: 0; z-index: 300; height: 70px;
  background: var(--bg-nav); backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  transition: box-shadow var(--t), background var(--t);
}
.nav.scrolled { box-shadow: var(--sh-md); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 48px; width: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.nav-logo { display: flex; align-items: center; gap: 6px; text-decoration: none; }
.nav-logo img { height: 48px; width: auto; }
.nav-logo .logo-light { display: block; }
.nav-logo .logo-dark  { display: none;  }
[data-theme="dark"] .nav-logo .logo-light { display: none; }
[data-theme="dark"] .nav-logo .logo-dark  { display: block; }
.nav-links { display: flex; gap: 2px; align-items: center; }
.nav-links a {
  color: var(--text-mid); font-size: 0.84rem; font-weight: 500;
  padding: 6px 8px; border-radius: var(--r); white-space: nowrap;
  transition: color var(--t), background var(--t);
}
.nav-links a:hover { color: var(--charcoal); background: var(--bg-soft); }
[data-theme="dark"] .nav-links a:hover { color: var(--white); }
.nav-links a.active { color: var(--blue); font-weight: 600; }
.nav-dropdown { position: relative; }
.nav-sub { display: none; position: absolute; top: 100%; left: 0; min-width: 210px; background: var(--bg-nav); border: 1px solid var(--border); border-radius: 8px; padding: 6px; box-shadow: var(--sh-md); z-index: 1000; list-style: none; margin: 0; }
.nav-dropdown:hover .nav-sub { display: block; }
.nav-sub li { margin: 0; padding: 0; }
.nav-sub li a { display: block; padding: 8px 12px; border-radius: 6px; font-size: .82rem; color: var(--text); white-space: nowrap; font-weight: 400; }
.nav-sub li a:hover { background: var(--bg-soft); color: var(--blue); }
.nav-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.theme-toggle {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--bg-soft); border: 1px solid var(--border);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  color: var(--text-mid); transition: all var(--t);
}
.theme-toggle:hover { background: var(--blue-dim); border-color: var(--blue); color: var(--blue); }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
.nav-hamburger { display: none; flex-direction: column; gap: 4px; width: 38px; height: 38px; justify-content: center; align-items: center; background: none; border: 1px solid var(--border); border-radius: var(--r); cursor: pointer; padding: 8px; }
.nav-hamburger span { display: block; width: 16px; height: 2px; background: var(--text); border-radius: 1px; transition: transform 0.3s, opacity 0.3s; }
.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-mobile { display: none; position: fixed; top: 70px; left: 0; right: 0; bottom: 0; background: var(--bg); z-index: 299; padding: 24px; flex-direction: column; gap: 6px; border-top: 1px solid var(--border); overflow-y: auto; }
.nav-mobile.open { display: flex; }
.nav-mobile a { color: var(--text); font-size: 1rem; font-weight: 500; padding: 14px 16px; border-radius: var(--r); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; transition: color var(--t), background var(--t); }
.nav-mobile a:hover { color: var(--blue); background: var(--blue-dim); }

/* ── PAGE HERO ── */
.page-hero {
  background: var(--bg-soft); border-bottom: 1px solid var(--border);
  padding: 80px 0 64px; position: relative; overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute; right: 0; top: 0; bottom: 0; width: 40%;
  background: linear-gradient(to left, var(--blue-dim), transparent);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.78rem; color: var(--text-dim); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-mid); transition: color var(--t); }
.breadcrumb a:hover { color: var(--blue); }

/* ── BLOG GRID ── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 48px;
}
.blog-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--r-lg); overflow: hidden;
  display: flex; flex-direction: column;
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow var(--t), border-color var(--t);
}
.blog-card.visible { opacity: 1; transform: translateY(0); }
.blog-card.visible:hover { box-shadow: var(--sh-xl); transform: translateY(-4px); border-color: rgba(74,144,217,0.25); }
.blog-card-body { padding: 28px; flex: 1; display: flex; flex-direction: column; }
.blog-card-label { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--blue); margin-bottom: 12px; }
.blog-card h2 { font-family: var(--head); font-size: 1.15rem; line-height: 1.35; margin-bottom: 12px; color: var(--coal); }
.blog-card p { font-size: 0.88rem; color: var(--text-mid); line-height: 1.75; flex: 1; margin-bottom: 20px; }
.blog-card-meta { font-size: 0.75rem; color: var(--text-dim); margin-bottom: 16px; }
.blog-card-link { font-size: 0.88rem; font-weight: 600; color: var(--blue); display: inline-flex; align-items: center; gap: 6px; transition: gap var(--t); }
.blog-card:hover .blog-card-link { gap: 10px; }

/* ── FOOTER ── */
.footer { background: #0c1117; padding: 0 0 36px; color: rgba(255,255,255,0.55); }
[data-theme="dark"] .footer { background: #0c1117; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand-name { font-family: var(--head); font-size: 1.4rem; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-brand-name span { color: var(--blue); }
.footer-desc { font-size: 0.85rem; color: rgba(255,255,255,0.5); line-height: 1.7; }
.footer-col h5 { font-family: var(--body); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.35); margin-bottom: 16px; }
.footer-col a { display: block; color: rgba(255,255,255,0.55); font-size: 0.88rem; padding: 4px 0; transition: color var(--t); }
.footer-col a:hover { color: var(--blue); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.07); padding-top: 28px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.78rem; color: rgba(255,255,255,0.28); }
.footer-bottom a { color: rgba(255,255,255,0.35); transition: color var(--t); }
.footer-bottom a:hover { color: var(--blue); }

/* ── SKIP LINK ── */
.skip-link { position: absolute; top: -100px; left: 16px; background: var(--blue); color: #fff; padding: 10px 20px; border-radius: 0 0 var(--r) var(--r); font-size: 0.85rem; font-weight: 700; z-index: 9999; transition: top 0.2s; }
.skip-link:focus { top: 0; }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .container { padding: 0 32px; }
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  section { padding: 72px 0; }
  .top-bar { padding: 8px 20px; }
  .top-bar-right { display: none; }
  .nav-inner { padding: 0 20px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .blog-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

/* ── CONTACT STRIP ── */
.contact-strip {
  background: linear-gradient(180deg, #1a2535 0%, #0d1117 100%);
  padding: 96px 0; text-align: center;
  position: relative; overflow: hidden;
}
[data-theme="dark"] .contact-strip {
  background: linear-gradient(180deg, #1a2535 0%, #0d1117 100%);
}
.contact-strip::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(74,144,217,0.22) 0%, transparent 65%);
  pointer-events: none;
}
.contact-strip h2 { color: #fff; margin-bottom: 12px; font-size: clamp(1.9rem,3.5vw,3.2rem); }
[data-theme="dark"] .contact-strip h2 { color: var(--white); }
.contact-strip-sub { font-size: 1rem; color: rgba(255,255,255,0.55); margin-bottom: 44px; }
[data-theme="dark"] .contact-strip-sub { color: var(--text-mid); }
.contact-actions { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; gap: 18px; }
.contact-actions-main { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.btn-call {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--blue); color: #fff;
  font-size: 1rem; font-weight: 700;
  padding: 17px 40px; border-radius: var(--r); letter-spacing: 0.01em;
  border: none; cursor: pointer; text-decoration: none;
  box-shadow: 0 4px 20px var(--blue-glow), 0 1px 0 rgba(255,255,255,0.15) inset;
  transition: all var(--t);
}
.btn-call:hover { background: var(--blue-dk); transform: translateY(-2px); }
.contact-prefer-write { font-size: 0.82rem; color: rgba(255,255,255,0.35); text-decoration: none; transition: color var(--t); display: inline-flex; align-items: center; gap: 6px; }
.contact-prefer-write:hover { color: rgba(255,255,255,0.65); }