/* ============================================================
   Callserv Sdn Bhd - Main Stylesheet
   Industrial Gas Supplier Malaysia
   ============================================================ */

:root {
  --color-primary: #0a4d8c;
  --color-primary-dark: #073968;
  --color-primary-light: #1565b3;
  --color-accent: #ff6b00;
  --color-accent-dark: #d95600;
  --color-text: #1a2332;
  --color-text-muted: #5a6878;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-bg-dark: #0e1a2b;
  --color-border: #e0e6ed;
  --color-success: #2e8b57;
  --shadow-sm: 0 1px 3px rgba(10, 30, 50, 0.08);
  --shadow-md: 0 4px 12px rgba(10, 30, 50, 0.1);
  --shadow-lg: 0 10px 30px rgba(10, 30, 50, 0.15);
  --radius: 6px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --transition: 0.25s ease;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-top: 0; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p { margin: 0 0 1em; }

ul, ol { padding-left: 1.4em; }
li { margin-bottom: 0.4em; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ============================================================
   Top Bar
   ============================================================ */

.topbar {
  background: var(--color-bg-dark);
  color: #cdd6e0;
  font-size: 0.85rem;
  padding: 0.5rem 0;
}

.topbar .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topbar a {
  color: #cdd6e0;
  margin-left: 1rem;
}

.topbar a:hover {
  color: #fff;
}

/* ============================================================
   Header & Navigation
   ============================================================ */

.site-header {
  background: #fff;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

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

.nav {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav li { margin: 0; }

.nav a {
  display: block;
  padding: 0.6rem 1rem;
  color: var(--color-text);
  font-weight: 500;
  border-radius: var(--radius);
}

.nav a:hover,
.nav a.active {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.nav .btn-cta {
  margin-left: 0.5rem;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.nav .btn-cta:hover {
  background: var(--color-accent-dark);
  color: #fff;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.5rem;
  font-size: 1.5rem;
  color: var(--color-primary);
}

/* Dropdown */
.has-dropdown { position: relative; }

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: #fff;
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
  min-width: 240px;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
}

.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown a {
  padding: 0.6rem 1.25rem;
  border-radius: 0;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-block;
  padding: 0.85rem 1.6rem;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius);
  border: 0;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition);
  text-align: center;
}

.btn:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
  background: var(--color-accent-dark);
}

.btn-outline {
  background: transparent;
  border: 2px solid #fff;
  color: #fff;
}

.btn-outline:hover {
  background: #fff;
  color: var(--color-primary);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.05rem;
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 107, 0, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.08) 0%, transparent 40%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: #fff;
  max-width: 800px;
  margin-bottom: 1rem;
}

.hero .lead {
  font-size: 1.15rem;
  max-width: 720px;
  color: #d6e3f0;
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  flex-wrap: wrap;
  color: #d6e3f0;
}

.hero-meta strong {
  display: block;
  color: #fff;
  font-size: 1.4rem;
}

/* Page hero (smaller hero for inner pages) */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  padding: 3.5rem 0 3rem;
}

.page-hero h1 { color: #fff; margin-bottom: 0.5rem; }
.page-hero p { color: #d6e3f0; max-width: 720px; font-size: 1.1rem; margin: 0; }

.breadcrumbs {
  font-size: 0.9rem;
  color: #a8bdd1;
  margin-bottom: 0.75rem;
}

.breadcrumbs a { color: #a8bdd1; }
.breadcrumbs a:hover { color: #fff; }

/* ============================================================
   Sections
   ============================================================ */

section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-dark {
  background: var(--color-bg-dark);
  color: #cdd6e0;
}

.section-dark h2,
.section-dark h3 { color: #fff; }

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem;
}

.section-header h2 { margin-bottom: 0.5rem; }
.section-header p { color: var(--color-text-muted); font-size: 1.1rem; }

.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

/* ============================================================
   Cards / Grids
   ============================================================ */

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.card h3 {
  margin-top: 0.5rem;
  color: var(--color-primary);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.card.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card.card-link:hover h3 { color: var(--color-accent); }

.card .read-more {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
  color: var(--color-accent);
}

.card .read-more::after {
  content: " →";
  transition: transform var(--transition);
  display: inline-block;
}

.card-link:hover .read-more::after { transform: translateX(3px); }

/* Industry pill grid */
.pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.pill-grid li {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.5rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  margin: 0;
}

/* Features list (checkmarks) */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 0.75rem;
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 1.4rem;
  height: 1.4rem;
  background: var(--color-success);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

/* Gas product table */
.gas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.gas-card {
  background: #fff;
  border-left: 4px solid var(--color-accent);
  padding: 1.4rem 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.gas-card h3 {
  margin: 0 0 0.4rem;
  color: var(--color-primary);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.gas-card h3 .formula {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.gas-card p { margin: 0; color: var(--color-text-muted); }

/* ============================================================
   FAQ
   ============================================================ */

.faq {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-item summary {
  padding: 1.1rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-size: 1.6rem;
  color: var(--color-accent);
  transition: transform var(--transition);
  font-weight: 300;
  line-height: 1;
}

.faq-item[open] summary::after { transform: rotate(45deg); }

.faq-item .faq-body {
  padding: 0 1.5rem 1.2rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Final CTA strip
   ============================================================ */

.cta-strip {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: #fff;
  padding: 3.5rem 0;
  text-align: center;
}

.cta-strip h2 { color: #fff; margin-bottom: 0.5rem; }
.cta-strip p { color: #fff0e0; font-size: 1.1rem; margin-bottom: 1.75rem; }

.cta-strip .btn {
  background: #fff;
  color: var(--color-accent-dark);
}

.cta-strip .btn:hover { background: #fff5eb; }

.cta-strip .btn-outline {
  background: transparent;
  border: 2px solid #fff;
  color: #fff;
}

.cta-strip .btn-outline:hover {
  background: #fff;
  color: var(--color-accent-dark);
}

/* ============================================================
   Contact form
   ============================================================ */

.form-wrap {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group { margin-bottom: 1rem; }
.form-group.full { grid-column: 1 / -1; }

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  background: #fff;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: 0;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(10, 77, 140, 0.12);
}

.form-group textarea { min-height: 130px; resize: vertical; }

.form-success {
  display: none;
  background: #e8f5ee;
  border-left: 4px solid var(--color-success);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  border-radius: var(--radius);
  color: #1d5d3a;
}

/* Contact info card */
.info-card {
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.info-card h3 { color: #fff; }

.info-card a { color: #fff; text-decoration: underline; }
.info-card a:hover { color: #ffd9b8; }

.info-card .info-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  align-items: flex-start;
}

.info-card .info-row .label {
  min-width: 80px;
  font-weight: 700;
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background: var(--color-bg-dark);
  color: #a8bdd1;
  padding: 3.5rem 0 1.5rem;
  font-size: 0.95rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.site-footer h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li { margin-bottom: 0.5rem; }

.site-footer a { color: #a8bdd1; }
.site-footer a:hover { color: #fff; }

.footer-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-logo span { color: var(--color-accent); }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: #7a8fa3;
}

/* ============================================================
   WhatsApp float button
   ============================================================ */

.whatsapp-float {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: #25d366;
  color: #fff;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 99;
  font-size: 1.6rem;
  transition: transform var(--transition);
}

.whatsapp-float:hover {
  transform: scale(1.08);
  color: #fff;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 900px) {
  .nav-toggle { display: block; }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0;
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav.open {
    max-height: 600px;
  }

  .nav li { width: 100%; }
  .nav a { padding: 0.85rem 1rem; }

  .nav .btn-cta { margin: 0.5rem 0 0; }

  .dropdown {
    position: static;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding-left: 1rem;
    min-width: 0;
  }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .hero { padding: 3rem 0; }
}

@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  section { padding: 3rem 0; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
}