/* ===================================================================
   SIGNTECH IT — Design System
   Colors derived from the logo gradient (navy -> blue -> sky blue)
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Hind+Siliguri:wght@400;500;600;700&display=swap');

:root {
  /* Brand colors */
  --navy: #0B1E3D;
  --blue: #1E6FE0;
  --sky: #4FA3FF;
  --green: #1EBE73;
  --amber: #F5A623;
  --gray: #5A6472;

  /* Surfaces (light mode default) */
  --bg: #FFFFFF;
  --bg-alt: #F7F9FC;
  --surface: #FFFFFF;
  --surface-2: #F2F5FA;
  --border: rgba(11, 30, 61, 0.08);
  --text: #101828;
  --text-muted: #5A6472;
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
  --shadow: 0 20px 40px rgba(11, 30, 61, 0.08);
  --shadow-lg: 0 30px 60px rgba(11, 30, 61, 0.14);

  --gradient: linear-gradient(135deg, var(--navy) 0%, var(--blue) 55%, var(--sky) 100%);
  --gradient-soft: linear-gradient(135deg, rgba(30,111,224,0.10), rgba(79,163,255,0.10));

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --font-en: 'Inter', system-ui, -apple-system, sans-serif;
  --font-bn: 'Hind Siliguri', 'Inter', sans-serif;

  --container: 1240px;
  --section-pad: 96px;
}

[data-theme="dark"] {
  --bg: #0B1120;
  --bg-alt: #0F172A;
  --surface: #111A2E;
  --surface-2: #16213A;
  --border: rgba(255, 255, 255, 0.08);
  --text: #EDF2FA;
  --text-muted: #92A0B8;
  --glass-bg: rgba(17, 26, 46, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 30px 70px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-en);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}
body.lang-bn, .lang-bn * { font-family: var(--font-bn); }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--section-pad) 0; }
.section-alt { background: var(--bg-alt); }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue);
  background: var(--gradient-soft);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; margin: 0 0 14px; color: var(--text); }
h1 { font-size: clamp(34px, 5vw, 58px); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(26px, 3.4vw, 38px); letter-spacing: -0.01em; }
h3 { font-size: 20px; }
p { margin: 0 0 16px; color: var(--text-muted); }
.lead { font-size: 18px; color: var(--text-muted); }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius-pill); font-weight: 600; font-size: 15px;
  border: 1px solid transparent; transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 12px 24px rgba(30,111,224,0.28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(30,111,224,0.38); }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border); }
.btn-outline:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--blue); padding: 8px 4px; }
.btn-ghost:hover { text-decoration: underline; }
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ---------------- Announcement bar ---------------- */
.announcement {
  background: var(--gradient); color: #fff; text-align: center; font-size: 13.5px; font-weight: 600;
  padding: 10px 40px; position: relative;
}
.announcement .close-bar {
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: #fff; opacity: 0.75; font-size: 16px;
}
.announcement .close-bar:hover { opacity: 1; }

/* ---------------- Navbar ---------------- */
.navbar {
  position: sticky; top: 0; z-index: 100;
  padding: 18px 0; transition: all 0.3s ease;
}
.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  padding: 12px 0;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; }
.brand .mark {
  width: 38px; height: 38px; border-radius: 10px; background: var(--gradient);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 16px; font-weight: 800;
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-weight: 500; font-size: 15px; position: relative; padding: 4px 0; color: var(--text); }
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px; background: var(--gradient);
  transition: width 0.25s ease;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-utils { display: flex; align-items: center; gap: 14px; }
.icon-btn {
  width: 40px; height: 40px; border-radius: var(--radius-pill); display: flex; align-items: center; justify-content: center;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text); font-size: 16px;
}
.icon-btn:hover { border-color: var(--blue); }
.lang-switch {
  display: flex; background: var(--surface-2); border-radius: var(--radius-pill); padding: 4px; border: 1px solid var(--border);
}
.lang-switch a { padding: 6px 12px; border-radius: var(--radius-pill); font-size: 13px; font-weight: 700; }
.lang-switch a.active { background: var(--gradient); color: #fff; }
.mobile-toggle { display: none; background: none; border: none; font-size: 22px; color: var(--text); }
.mobile-menu { display: none; }

/* ---------------- Hero ---------------- */
.hero { padding: 64px 0 40px; position: relative; overflow: hidden; }
.hero .container { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.hero-copy h1 { margin-bottom: 20px; }
.hero-copy .lead { margin-bottom: 32px; max-width: 520px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 20px; }
.hero-visual { position: relative; }
.hero-visual .device {
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg);
  transform: rotate(3deg); border: 8px solid var(--surface);
  animation: float 6s ease-in-out infinite;
}
.hero-visual .device img { width: 100%; }
.float-card {
  position: absolute; background: var(--glass-bg); backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border); border-radius: var(--radius); padding: 14px 18px;
  box-shadow: var(--shadow); font-size: 13px; font-weight: 700; display: flex; align-items: center; gap: 10px;
  animation: float 5s ease-in-out infinite;
}
.float-card.f1 { top: 8%; left: -8%; animation-delay: 0.5s; }
.float-card.f2 { bottom: 10%; right: -6%; animation-delay: 1.2s; }
.float-card .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
@media (prefers-reduced-motion: reduce) { .float-card, .hero-visual .device { animation: none; } }

/* ---------------- Trust strip ---------------- */
.trust-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.trust-item .num { font-size: clamp(28px, 4vw, 40px); font-weight: 800; background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.trust-item .label { color: var(--text-muted); font-size: 14px; font-weight: 600; }

/* ---------------- Feature grid ---------------- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.feature-card .icon { font-size: 26px; margin-bottom: 14px; }
.feature-card h3 { font-size: 16px; margin-bottom: 4px; }

/* ---------------- Filter pills ---------------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.filter-pill {
  padding: 9px 20px; border-radius: var(--radius-pill); border: 1px solid var(--border); font-size: 14px; font-weight: 600;
  background: var(--surface); color: var(--text-muted); transition: all 0.2s ease;
}
.filter-pill.active, .filter-pill:hover { background: var(--gradient); color: #fff; border-color: transparent; }

/* ---------------- Portfolio / product grids ---------------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card .thumb { aspect-ratio: 4/3; overflow: hidden; background: var(--surface-2); }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.card:hover .thumb img { transform: scale(1.06); }
.card .body { padding: 20px 22px; }
.tag { display: inline-block; font-size: 12px; font-weight: 700; color: var(--blue); background: var(--gradient-soft); padding: 4px 10px; border-radius: var(--radius-pill); margin-bottom: 10px; }
.tech-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 16px; }
.chip { font-size: 11px; padding: 3px 9px; border-radius: var(--radius-pill); background: var(--surface-2); color: var(--text-muted); }
.card-actions { display: flex; gap: 10px; }
.price-row { display: flex; align-items: baseline; gap: 10px; margin: 6px 0 14px; }
.price-new { font-size: 22px; font-weight: 800; color: var(--text); }
.price-old { font-size: 15px; color: var(--text-muted); text-decoration: line-through; }
.badge-save { background: var(--green); color: #fff; font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: var(--radius-pill); }
.stars { color: var(--amber); font-size: 13px; }

/* ---------------- Pricing table ---------------- */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; align-items: stretch; }
.pricing-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px 26px;
  display: flex; flex-direction: column; position: relative; transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.pricing-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.pricing-card.highlight { border: 2px solid var(--blue); box-shadow: var(--shadow-lg); }
.pricing-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--gradient); color: #fff; font-size: 12px; font-weight: 700; padding: 5px 16px; border-radius: var(--radius-pill);
}
.pricing-card .price { font-size: 34px; font-weight: 800; margin: 10px 0 4px; }
.pricing-card .meta { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.pricing-card ul { margin-bottom: 24px; flex-grow: 1; }
.pricing-card li { padding: 8px 0; border-top: 1px solid var(--border); font-size: 14px; display: flex; gap: 8px; }
.pricing-card li:first-child { border-top: none; }
.pricing-card li::before { content: '✓'; color: var(--green); font-weight: 800; }

/* ---------------- Process stepper ---------------- */
.process-track { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; position: relative; }
.process-track::before {
  content: ''; position: absolute; top: 22px; left: 8%; right: 8%; height: 2px; background: var(--border); z-index: 0;
}
.process-step { text-align: center; position: relative; z-index: 1; }
.process-step .step-num {
  width: 44px; height: 44px; border-radius: 50%; background: var(--gradient); color: #fff; font-weight: 800;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 14px; font-size: 15px;
}
.process-step h3 { font-size: 15px; }
.process-step p { font-size: 13px; }

/* ---------------- Testimonials ---------------- */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; }
.testimonial-card .who { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
.testimonial-card .avatar { width: 44px; height: 44px; border-radius: 50%; overflow: hidden; background: var(--surface-2); }
.testimonial-card .name { font-weight: 700; font-size: 14px; }
.testimonial-card .biz { font-size: 12px; color: var(--text-muted); }

/* ---------------- Metrics band ---------------- */
.metrics-band { background: var(--gradient); border-radius: var(--radius-lg); padding: 56px 40px; display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; text-align: center; color: #fff; }
.metrics-band .num { font-size: clamp(28px,4vw,40px); font-weight: 800; }
.metrics-band .label { opacity: 0.85; font-size: 14px; }

/* ---------------- FAQ ---------------- */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  width: 100%; text-align: left; background: none; border: none; padding: 22px 0; font-size: 16px; font-weight: 700;
  display: flex; justify-content: space-between; align-items: center; color: var(--text);
}
.faq-q .plus { transition: transform 0.25s ease; color: var(--blue); font-size: 20px; }
.faq-item.open .faq-q .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.open .faq-a { max-height: 240px; }
.faq-a p { padding-bottom: 20px; margin: 0; }

/* ---------------- About ---------------- */
.about-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; align-items: center; }
.about-photo { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.skill-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }

/* ---------------- Tech strip ---------------- */
.tech-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 40px; align-items: center; opacity: 0.7; }
.tech-strip span { font-weight: 700; font-size: 15px; filter: grayscale(1); transition: filter 0.2s, opacity 0.2s; }
.tech-strip span:hover { filter: none; opacity: 1; color: var(--blue); }

/* ---------------- Blog ---------------- */
.blog-card .body { padding: 22px; }
.blog-meta { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }

/* ---------------- Contact ---------------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.form-field input, .form-field textarea, .form-field select {
  width: 100%; padding: 13px 16px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font-family: inherit; font-size: 15px; transition: border-color 0.2s;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus { border-color: var(--blue); outline: none; }
.contact-channels { display: flex; flex-direction: column; gap: 14px; }
.channel-btn {
  display: flex; align-items: center; gap: 14px; padding: 16px 20px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--surface); font-weight: 600; transition: all 0.2s ease;
}
.channel-btn:hover { border-color: var(--blue); transform: translateX(4px); }
.channel-btn .ic { width: 40px; height: 40px; border-radius: 50%; background: var(--gradient-soft); display: flex; align-items: center; justify-content: center; color: var(--blue); font-size: 18px; }
.map-embed { border-radius: var(--radius); overflow: hidden; margin-top: 20px; border: 1px solid var(--border); }
.alert-success { background: rgba(30,190,115,0.12); border: 1px solid var(--green); color: var(--green); padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 20px; font-weight: 600; }
.alert-error { background: rgba(220,53,69,0.1); border: 1px solid #dc3545; color: #dc3545; padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 20px; font-weight: 600; }

/* ---------------- Footer ---------------- */
footer.site-footer { background: var(--navy); color: rgba(255,255,255,0.8); padding: 72px 0 24px; }
footer.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 18px; }
footer.site-footer a { color: rgba(255,255,255,0.7); font-size: 14px; }
footer.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 32px; margin-bottom: 48px; }
.footer-grid li { margin-bottom: 10px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 13px; }
.social-row { display: flex; gap: 10px; margin-top: 16px; }
.social-row a { width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; }

/* ---------------- Floating utilities ---------------- */
.floating-actions { position: fixed; right: 22px; bottom: 22px; z-index: 90; display: flex; flex-direction: column; gap: 12px; align-items: flex-end; }
.fab { width: 54px; height: 54px; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-lg); font-size: 22px; color: #fff; }
.fab-whatsapp { background: #25D366; }
.fab-top { background: var(--surface); color: var(--text); border: 1px solid var(--border); opacity: 0; pointer-events: none; transition: opacity 0.2s ease; }
.fab-top.visible { opacity: 1; pointer-events: auto; }

/* ---------------- Reveal animation ---------------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------------- Page header (inner pages) ---------------- */
.page-header { padding: 56px 0 20px; text-align: center; }
.breadcrumb { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; }
.breadcrumb a:hover { color: var(--blue); }

/* ---------------- Blog detail / static content ---------------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose p { color: var(--text); font-size: 17px; }

/* =================== RESPONSIVE =================== */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 480px; margin: 0 auto; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .process-track { grid-template-columns: repeat(3, 1fr); row-gap: 40px; }
  .process-track::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  :root { --section-pad: 64px; }
  .nav-links, .nav-utils .lang-switch { display: none; }
  .mobile-toggle { display: block; }
  .trust-strip, .metrics-band, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .grid-3, .grid-4, .pricing-grid { grid-template-columns: 1fr; }
  .process-track { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  h1 { font-size: 32px; }
}

/* ---------------- Mobile menu drawer ---------------- */
.mobile-menu.open {
  display: block; position: fixed; inset: 0; z-index: 200; background: var(--bg);
  padding: 24px; overflow-y: auto;
}
.mobile-menu .close-menu { background: none; border: none; font-size: 26px; float: right; color: var(--text); }
.mobile-menu ul { margin-top: 50px; display: flex; flex-direction: column; gap: 4px; }
.mobile-menu a { display: block; padding: 14px 4px; font-size: 18px; font-weight: 600; border-bottom: 1px solid var(--border); }

/* Sticky mobile bottom bar */
.mobile-bottom-bar { display: none; }
@media (max-width: 720px) {
  .mobile-bottom-bar {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 95;
    background: var(--glass-bg); backdrop-filter: blur(16px); border-top: 1px solid var(--glass-border);
    padding: 10px 12px; justify-content: space-around; box-shadow: 0 -8px 24px rgba(0,0,0,0.08);
  }
  .mobile-bottom-bar a { display: flex; flex-direction: column; align-items: center; font-size: 11px; font-weight: 600; gap: 4px; color: var(--text); }
  body { padding-bottom: 68px; }
  .floating-actions { bottom: 78px; }
}