/* ============================================
   GISL — Design System & Global Styles
   Brand Colors: Forest Green #4A6741, Crimson #C62828
   ============================================ */

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

:root {
  /* Brand palette */
  --green: #4A6741;
  --green-dark: #2E4328;
  --green-light: #6B8F5E;
  --crimson: #C62828;
  --crimson-dark: #8E0000;
  --crimson-light: #FF5F52;

  /* Neutrals */
  --white: #FFFFFF;
  --off-white: #F7F8FA;
  --gray-100: #F0F2F5;
  --gray-200: #E4E7EC;
  --gray-300: #D0D5DD;
  --gray-600: #667085;
  --gray-800: #1D2939;
  --charcoal: #101828;

  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', var(--font-primary);

  /* Spacing */
  --section-pad: clamp(3.5rem, 8vw, 7rem) clamp(1rem, 5vw, 6rem);

  /* Transitions */
  --ease: cubic-bezier(.4, 0, .2, 1);
  --dur: 0.35s;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.1);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);
  --shadow-glow: 0 0 30px rgba(74,103,65,.15);
}

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

body {
  font-family: var(--font-primary);
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; color: var(--charcoal); }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--crimson);
  margin-bottom: 0.5rem;
}

.section-title { margin-bottom: 1rem; }

.section-desc {
  max-width: 620px;
  color: var(--gray-600);
  font-size: 1.05rem;
}

.section-header { text-align: center; margin-bottom: 3rem; }
.section-header .section-desc { margin: 0 auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--green);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(74,103,65,.3);
}
.btn-primary:hover {
  background: var(--green-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74,103,65,.4);
}

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

.btn-green {
  background: var(--green);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(74,103,65,.3);
}
.btn-green:hover {
  background: var(--green-dark);
  transform: translateY(-2px);
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: all var(--dur) var(--ease);
}

.header.scrolled {
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  padding: 0.6rem 0;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 3rem);
}

.logo img {
  height: 45px;
  width: auto;
  transition: all var(--dur) var(--ease);
  filter: brightness(0) invert(1); /* white logo on dark hero */
}
.header.scrolled .logo img {
  height: 35px;
  filter: none; /* original green logo on white header */
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--white);
  position: relative;
  transition: color var(--dur) var(--ease);
}

.header.scrolled .nav-links a { color: var(--gray-800); }

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--green);
  transition: width var(--dur) var(--ease);
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-cta {
  padding: 0.55rem 1.4rem !important;
  font-size: 0.85rem !important;
  background: var(--green);
  color: var(--white) !important;
  border-radius: 50px;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--green-dark); transform: translateY(-1px); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
  padding: 4px;
}
.hamburger span {
  width: 26px; height: 2.5px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--dur) var(--ease);
}
.header.scrolled .hamburger span { background: var(--charcoal); }

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(16,24,40,.75) 0%, rgba(46,67,40,.65) 100%),
              url('images/renewable-energy.png') center/cover no-repeat;
  color: var(--white);
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--white) 0%, transparent 100%);
}

.hero .container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 8rem clamp(1rem, 4vw, 3rem) 6rem;
}

.hero-content { max-width: 680px; }

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--crimson-light);
  margin-bottom: 1.2rem;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .3s forwards;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 1.2rem;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .5s forwards;
}

.hero h1 span { color: var(--crimson-light); }

.hero p {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: rgba(255,255,255,.85);
  max-width: 540px;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .7s forwards;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  opacity: 0;
  animation: fadeUp .8s var(--ease) .9s forwards;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 3rem;
  opacity: 0;
  animation: fadeUp .8s var(--ease) 1.1s forwards;
}
.hero-stat h3 { font-size: 2rem; color: var(--white); font-family: var(--font-display); }
.hero-stat p { font-size: .85rem; color: rgba(255,255,255,.65); margin-top: .2rem; }

/* ============================================
   ABOUT SECTION
   ============================================ */
.about { padding: var(--section-pad); background: var(--white); }

.about .container {
  max-width: 1200px;
  margin: 0 auto;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image img { width: 100%; height: 100%; object-fit: cover; min-height: 400px; }

.about-image .accent-bar {
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: 6px;
  background: linear-gradient(90deg, var(--green), var(--crimson));
}

.about-text .section-desc { margin-bottom: 2rem; }

/* Tabs */
.about-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.about-tab {
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--gray-200);
  background: transparent;
  color: var(--gray-600);
  transition: all var(--dur) var(--ease);
}

.about-tab.active,
.about-tab:hover {
  border-color: var(--green);
  background: var(--green);
  color: var(--white);
}

.about-tab-content {
  display: none;
  line-height: 1.8;
  color: var(--gray-600);
  font-size: 0.95rem;
}
.about-tab-content.active { display: block; animation: fadeIn .4s var(--ease); }

/* ============================================
   SERVICES SECTION
   ============================================ */
.services {
  padding: var(--section-pad);
  background: var(--off-white);
}

.services .container {
  max-width: 1200px;
  margin: 0 auto;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.service-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: all var(--dur) var(--ease);
  cursor: default;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.service-card-img {
  height: 220px;
  overflow: hidden;
}

.service-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s var(--ease);
}

.service-card:hover .service-card-img img { transform: scale(1.08); }

.service-card-body {
  padding: 1.5rem;
}

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--white);
  font-size: 1.3rem;
}

.service-card h3 { margin-bottom: .5rem; }

.service-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ============================================
   PROCESS SECTION
   ============================================ */
.process { padding: var(--section-pad); background: var(--white); }
.process .container { max-width: 1200px; margin: 0 auto; }

.process-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  position: relative;
}

.process-timeline::before {
  content: '';
  position: absolute;
  top: 36px; left: 10%; right: 10%;
  height: 3px;
  background: var(--gray-200);
  z-index: 0;
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--green);
  transition: all var(--dur) var(--ease);
}

.process-step:hover .step-number {
  background: var(--green);
  color: var(--white);
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

.process-step h3 { font-size: 0.95rem; margin-bottom: .4rem; }
.process-step p { font-size: .82rem; color: var(--gray-600); }

/* ============================================
   WHY CHOOSE US
   ============================================ */
.why-us {
  padding: var(--section-pad);
  background: linear-gradient(135deg, var(--green-dark), var(--green));
  color: var(--white);
}
.why-us .container { max-width: 1200px; margin: 0 auto; }
.why-us .section-label { color: var(--crimson-light); }
.why-us .section-title { color: var(--white); }
.why-us .section-desc { color: rgba(255,255,255,.75); }

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.why-card {
  padding: 2rem;
  border-radius: 16px;
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.12);
  transition: all var(--dur) var(--ease);
}

.why-card:hover {
  background: rgba(255,255,255,.14);
  transform: translateY(-4px);
}

.why-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.why-card h3 { color: var(--white); font-size: 1.1rem; margin-bottom: .5rem; }
.why-card p { color: rgba(255,255,255,.7); font-size: .9rem; }

/* ============================================
   CLIENTS & PARTNERS
   ============================================ */
.clients {
  padding: var(--section-pad);
  background: var(--white);
}
.clients .container { max-width: 1200px; margin: 0 auto; }

.clients-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 3rem;
}

.client-logo {
  height: 60px;
  filter: grayscale(100%);
  opacity: 0.5;
  transition: all var(--dur) var(--ease);
}
.client-logo:hover {
  filter: grayscale(0%);
  opacity: 1;
  transform: scale(1.08);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
  padding: var(--section-pad);
  background: var(--off-white);
}
.contact .container { max-width: 1200px; margin: 0 auto; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-form {
  background: var(--white);
  padding: 2.5rem;
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

.form-group { margin-bottom: 1.2rem; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: .4rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--gray-200);
  border-radius: 10px;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  color: var(--gray-800);
  transition: border-color var(--dur) var(--ease);
  background: var(--white);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(74,103,65,.1);
}

.form-group textarea { resize: vertical; min-height: 120px; }

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

/* Contact info side */
.contact-info { display: flex; flex-direction: column; gap: 1.5rem; }

.contact-detail {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-detail-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--green), var(--green-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-detail h4 { font-size: .95rem; margin-bottom: .2rem; }
.contact-detail p, .contact-detail a { color: var(--gray-600); font-size: .9rem; }
.contact-detail a:hover { color: var(--crimson); }

/* Branch map tabs */
.branch-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.branch-tab {
  padding: 0.4rem 0.9rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--gray-200);
  background: transparent;
  color: var(--gray-600);
  transition: all var(--dur) var(--ease);
}

.branch-tab.active,
.branch-tab:hover {
  border-color: var(--green);
  background: var(--green);
  color: var(--white);
}

.map-container {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  height: 250px;
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.map-frame { display: none; }
.map-frame.active { display: block; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--charcoal);
  color: rgba(255,255,255,.7);
  padding: 4rem clamp(1rem, 4vw, 3rem) 1.5rem;
}
.footer .container { max-width: 1200px; margin: 0 auto; }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand img {
  height: 45px;
  width: auto;
  object-fit: contain;
  margin-bottom: 1rem;
  filter: brightness(0) invert(1); /* white logo on dark footer */
}
.footer-brand p { font-size: .88rem; max-width: 280px; line-height: 1.7; }

.footer h4 {
  color: var(--white);
  font-size: .95rem;
  margin-bottom: 1rem;
}

.footer-links a {
  display: block;
  padding: .35rem 0;
  font-size: .88rem;
  transition: color var(--dur) var(--ease);
}
.footer-links a:hover { color: var(--crimson-light); }

.footer-social {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.footer-social a {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--dur) var(--ease);
}
.footer-social a:hover {
  background: var(--crimson);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Scroll-triggered animation classes */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }
.reveal-delay-5 { transition-delay: .5s; }

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 992px) {
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .about-image { max-height: 350px; }
  .services-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .process-timeline {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .process-timeline::before { display: none; }
  .process-step { display: flex; align-items: center; gap: 1rem; text-align: left; }
  .step-number { margin: 0; width: 56px; height: 56px; font-size: 1.1rem; flex-shrink: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 75%;
    max-width: 320px;
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
    box-shadow: -10px 0 30px rgba(0,0,0,.1);
    transition: right var(--dur) var(--ease);
    padding: 2rem;
  }
  .nav-links.open { right: 0; }
  .nav-links a { color: var(--gray-800) !important; font-size: 1.1rem; }
  .hamburger { display: flex; }

  .hero-stats { flex-direction: column; gap: 1rem; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { text-align: center; justify-content: center; }

  .about-tabs { flex-wrap: wrap; }

  .why-grid { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: .5rem; text-align: center; }

  .hero .container { padding: 7rem 1.2rem 5rem; }
}

/* Mobile nav overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 999;
}
.nav-overlay.open { display: block; }

/* Form success message */
.form-success {
  display: none;
  text-align: center;
  padding: 2rem;
}
.form-success.show { display: block; }
.form-success .check-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--green);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 1rem;
}