/* =========================================================
   SILICO ONE (PVT.) LTD. — Corporate Website Stylesheet
   Structure: Tokens -> Base -> Layout -> Components -> Pages -> Utilities
   ========================================================= */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand colors */
  --navy: #0b2f73;
  --navy-dark: #081f4d;
  --navy-tint: #eef2f9;
  --red: #e31e24;
  --red-dark: #b8151a;
  --white: #ffffff;
  --light-gray: #f4f5f7;
  --mid-gray: #e3e6ea;
  --dark-gray: #2b2f36;
  --text: #333740;
  --text-muted: #6b7280;

  /* Signature gradient (the "sealant bead") */
  --bead-gradient: linear-gradient(90deg, var(--navy) 0%, var(--red) 100%);

  /* Type */
  --font-display: "Sora", "Segoe UI", Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", Arial, sans-serif;

  /* Layout */
  --container: 1200px;
  --header-h: 84px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 10px rgba(11, 47, 115, 0.06);
  --shadow-md: 0 10px 30px rgba(11, 47, 115, 0.12);
  --transition: 0.25s ease;
}

/* ---------- Reset / Base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

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

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

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

ul { list-style: none; }

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2.1rem, 4vw, 3.3rem); }
h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); }
h3 { font-size: 1.25rem; }

p { color: var(--text-muted); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 88px 0; }
section.tight { padding: 56px 0; }

/* Visible keyboard focus */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ---------- Signature element: the sealant bead ---------- */
.bead {
  width: 64px;
  height: 6px;
  border-radius: 999px;
  background: var(--bead-gradient);
  margin: 14px 0 0;
}
.bead.center { margin-left: auto; margin-right: auto; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 10px;
}

.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head.center { max-width: 640px; margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { margin-top: 14px; font-size: 1.02rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}
.btn-primary {
  background: var(--red);
  color: var(--white);
}
.btn-primary:hover { background: var(--red-dark); transform: translateY(-2px); box-shadow: 0 10px 22px rgba(227, 30, 36, 0.28); }

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, 0.7);
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-2px); }

.btn-outline-navy {
  background: transparent;
  color: var(--navy);
  border: 2px solid var(--navy);
}
.btn-outline-navy:hover { background: var(--navy); color: var(--white); transform: translateY(-2px); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--mid-gray);
  transition: box-shadow var(--transition);
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo img { height: 40px; width: auto; }

.main-nav ul { display: flex; align-items: center; gap: 6px; }

.main-nav a {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: var(--navy);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.main-nav a:hover { color: var(--red); background: var(--navy-tint); }

.main-nav a.active { color: var(--red); }
.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 3px;
  height: 3px;
  border-radius: 999px;
  background: var(--bead-gradient);
}

.nav-cta {
  margin-left: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  background: var(--navy);
  color: var(--white) !important;
  font-weight: 700;
}
.nav-cta:hover { background: var(--navy-dark); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}
.hamburger span {
  width: 26px;
  height: 3px;
  border-radius: 999px;
  background: var(--navy);
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 86vh;
  display: flex;
  align-items: center;
  color: var(--white);
  background:
    linear-gradient(115deg, rgba(8, 31, 77, 0.92) 0%, rgba(11, 47, 115, 0.82) 45%, rgba(227, 30, 36, 0.55) 100%),
    repeating-linear-gradient(135deg, rgba(255,255,255,0.05) 0 2px, transparent 2px 26px);
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -20%;
  width: 60%;
  height: 140%;
  background: radial-gradient(closest-side, rgba(255,255,255,0.10), transparent 70%);
  pointer-events: none;
}
.hero-content { max-width: 680px; position: relative; }
.hero-content .eyebrow { color: #ffb3b5; }
.hero-content h1 { color: var(--white); margin-bottom: 18px; }
.hero-content p { color: rgba(255, 255, 255, 0.86); font-size: 1.08rem; max-width: 560px; }
.hero-actions { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }

.page-hero {
  position: relative;
  padding: 150px 0 70px;
  color: var(--white);
  background: linear-gradient(120deg, var(--navy-dark), var(--navy) 60%, var(--red-dark));
}
.page-hero h1 { color: var(--white); }
.page-hero p { color: rgba(255, 255, 255, 0.85); margin-top: 12px; max-width: 620px; }
.breadcrumb { font-size: 0.85rem; color: rgba(255,255,255,0.75); margin-bottom: 14px; letter-spacing: 0.03em; }
.breadcrumb span { color: var(--white); font-weight: 600; }

/* ---------- Grid helpers ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 24px; }

/* ---------- Image placeholder ---------- */
.img-placeholder {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, var(--navy-tint), var(--light-gray));
  border: 1.5px dashed #b9c3d6;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  opacity: 0.7;
  text-align: center;
  padding: 20px;
}
.img-placeholder span {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
}
.img-placeholder svg { width: 46px; height: 46px; margin-bottom: 10px; stroke: var(--navy); }

/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--mid-gray);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--bead-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.card:hover::before { transform: scaleX(1); }

.icon-badge {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--navy-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.icon-badge svg { width: 28px; height: 28px; stroke: var(--navy); fill: none; stroke-width: 1.8; }

.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.95rem; }

/* Alt section background */
.bg-light { background: var(--light-gray); }
.bg-navy { background: var(--navy); color: var(--white); }
.bg-navy h2, .bg-navy h3 { color: var(--white); }
.bg-navy p { color: rgba(255,255,255,0.8); }

/* ---------- Fade-in on scroll ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark-gray);
  color: rgba(255, 255, 255, 0.78);
  padding-top: 64px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand .logo img { height: 36px; filter: brightness(0) invert(1); }
.footer-brand p { margin-top: 16px; font-size: 0.92rem; color: rgba(255, 255, 255, 0.62); max-width: 320px; }
.footer-heading {
  font-family: var(--font-display);
  color: var(--white);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 18px;
  position: relative;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 0.92rem; color: rgba(255,255,255,0.7); transition: color var(--transition), padding-left var(--transition); }
.footer-col ul a:hover { color: var(--white); padding-left: 4px; }
.footer-contact-block { margin-bottom: 18px; }
.footer-contact-block h4 { color: var(--white); font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 6px; }
.footer-contact-block p { font-size: 0.9rem; color: rgba(255,255,255,0.65); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  flex-wrap: wrap;
  gap: 12px;
}
.social-row { display: flex; gap: 10px; }
.social-row a {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), border-color var(--transition);
}
.social-row a:hover { background: var(--red); border-color: var(--red); }
.social-row svg { width: 16px; height: 16px; stroke: var(--white); fill: none; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-lg { margin-top: 48px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--navy-tint);
  color: var(--navy);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .grid-2 { grid-template-columns: 1fr; gap: 32px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 800px) {
  .main-nav { position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0; background: var(--white); padding: 20px 24px; transform: translateX(100%); transition: transform var(--transition); overflow-y: auto; }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 4px; }
  .main-nav a { padding: 14px 12px; font-size: 1.02rem; }
  .main-nav a.active::after { display: none; }
  .main-nav a.active { background: var(--navy-tint); border-radius: var(--radius-sm); }
  .nav-cta { text-align: center; margin: 10px 0 0; }
  .hamburger { display: flex; }
}

@media (max-width: 640px) {
  section { padding: 60px 0; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-6 { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .hero { min-height: auto; padding: 150px 0 80px; }
}