/* ============================================================
   BORRENERGI — Main Stylesheet
   ============================================================ */

/* ---- CSS Custom Properties ---- */
:root {
  --color-primary:    #e63312;
  --color-primary-dk: #c42a0e;
  --color-primary-lt: #ff5533;
  --color-dark:       #0f1923;
  --color-dark-2:     #1a2535;
  --color-dark-3:     #243044;
  --color-mid:        #4a5568;
  --color-light:      #f7f8fa;
  --color-white:      #ffffff;
  --color-border:     #e2e8f0;
  --color-text:       #1a2535;
  --color-text-muted: #64748b;

  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 40px rgba(0,0,0,.14), 0 4px 12px rgba(0,0,0,.08);

  --transition: 0.22s ease;

  --container:  1200px;
  --section-py: 96px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
address { font-style: normal; }
button { cursor: pointer; border: none; background: none; font: inherit; }

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

/* ---- Section ---- */
.section { padding: var(--section-py) 0; }
.section-dark { background: var(--color-dark); color: var(--color-white); }

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-top: 16px;
}
.section-dark .section-lead { color: rgba(255,255,255,0.65); }

/* ---- Typography ---- */
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; line-height: 1.15; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.015em; }
h3 { font-size: 1.2rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 0.95rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
p  { line-height: 1.7; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 3px; }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn-primary:hover {
  background: var(--color-primary-dk);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(230,51,18,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255,255,255,0.55);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.12);
  border-color: var(--color-white);
}

.btn-lg { padding: 15px 32px; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,25,35,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--color-white);
}

/* Nav */
.main-nav { margin-left: auto; }
.main-nav ul {
  display: flex;
  gap: 8px;
  align-items: center;
}
.main-nav a {
  color: rgba(255,255,255,0.8);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.main-nav a:hover { color: var(--color-white); background: rgba(255,255,255,0.08); }
.nav-portal {
  border: 1px solid rgba(255,255,255,0.2) !important;
}
.nav-cta { margin-left: 8px; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-dark);
  color: var(--color-white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(230,51,18,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 10% 80%, rgba(36,48,68,0.9) 0%, transparent 60%),
    linear-gradient(135deg, #0f1923 0%, #1a2535 50%, #0f1923 100%);
}

/* Animated grid overlay */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
  padding-top: 48px;
  padding-bottom: 80px;
}

.hero-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary-lt);
  margin-bottom: 20px;
}

.hero h1 { color: var(--color-white); margin-bottom: 24px; }

.hero-lead {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.72);
  max-width: 580px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-badges {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255,255,255,0.65);
}
.badge svg { color: var(--color-primary-lt); flex-shrink: 0; }

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.3);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   USP STRIP
   ============================================================ */
.usp-strip {
  background: var(--color-dark-2);
  padding: 40px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.usp-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.usp-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.usp-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(230,51,18,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-lt);
}

.usp-item strong {
  display: block;
  color: var(--color-white);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.usp-item p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.5;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services { background: var(--color-light); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

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

.service-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: rgba(230,51,18,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
  flex-shrink: 0;
}

.service-card h3 { margin-bottom: 12px; }

.service-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: 20px;
}

.service-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
  margin-top: auto;
}
.service-link:hover { gap: 8px; }

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text .section-eyebrow { color: var(--color-primary-lt); }

.about-text h2 { color: var(--color-white); margin-bottom: 24px; }

.about-text p {
  color: rgba(255,255,255,0.72);
  margin-bottom: 20px;
  font-size: 0.97rem;
}

.about-certs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 36px;
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
}
.cert-badge svg { color: var(--color-primary-lt); }

.about-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-stat-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: background var(--transition);
}
.about-stat-card:hover { background: rgba(255,255,255,0.08); }

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-number span { font-size: 1.4rem; }

.stat-label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact { background: var(--color-white); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}

.contact-info .section-eyebrow { color: var(--color-primary); }
.contact-info h2 { margin-bottom: 16px; }
.contact-info > p { color: var(--color-text-muted); margin-bottom: 40px; }

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-details li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(230,51,18,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.contact-details strong {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 2px;
}

.contact-details a,
.contact-details address {
  font-size: 0.97rem;
  color: var(--color-text);
  transition: color var(--transition);
}
.contact-details a:hover { color: var(--color-primary); }

/* Contact Form */
.contact-form-wrap {
  background: var(--color-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--color-border);
}

.contact-form { display: flex; flex-direction: column; gap: 20px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}
.form-group label span { color: var(--color-primary); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(230,51,18,0.12);
}

.form-group input.invalid,
.form-group select.invalid,
.form-group textarea.invalid {
  border-color: #dc2626;
}

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

.form-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.form-success {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: #f0fdf4;
  border: 1px solid #86efac;
  border-radius: var(--radius-sm);
  color: #166534;
  font-size: 0.92rem;
  font-weight: 500;
}

.form-error {
  padding: 14px 18px;
  background: #fef2f2;
  border: 1px solid #fca5a5;
  border-radius: var(--radius-sm);
  color: #991b1b;
  font-size: 0.92rem;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.65);
  padding-top: 64px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.6; margin-bottom: 20px; }

.footer-social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.7);
  transition: background var(--transition), color var(--transition);
}
.footer-social:hover { background: var(--color-primary); color: var(--color-white); }

.footer-nav h4,
.footer-contact h4 {
  color: var(--color-white);
  margin-bottom: 20px;
  font-size: 0.78rem;
}

.footer-nav ul { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a {
  font-size: 0.88rem;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--color-white); }

.footer-contact address p {
  font-size: 0.88rem;
  margin-bottom: 8px;
}
.footer-contact a { transition: color var(--transition); }
.footer-contact a:hover { color: var(--color-white); }

.footer-bottom {
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p { font-size: 0.82rem; color: rgba(255,255,255,0.35); }

/* ============================================================
   RESPONSIVE — Tablet (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  :root { --section-py: 72px; }

  .usp-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }
}

/* ============================================================
   RESPONSIVE — Mobile (≤ 768px)
   ============================================================ */
@media (max-width: 768px) {
  :root { --section-py: 56px; }

  /* Header */
  .nav-cta { display: none; }
  .hamburger { display: flex; }

  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-dark-2);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding: 24px;
    transform: translateY(-110%);
    transition: transform 0.3s ease;
    z-index: 99;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav ul { flex-direction: column; gap: 4px; }
  .main-nav a {
    display: block;
    padding: 12px 16px;
    font-size: 1rem;
  }

  /* Hero */
  .hero { min-height: 100svh; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }

  /* USP */
  .usp-grid { grid-template-columns: 1fr; gap: 20px; }

  /* Services */
  .services-grid { grid-template-columns: 1fr; }

  /* About */
  .about-visual { grid-template-columns: 1fr 1fr; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .contact-form-wrap { padding: 28px 20px; }
  .form-row { grid-template-columns: 1fr; }

  /* Footer */
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-brand { grid-column: auto; }
}

@media (max-width: 480px) {
  .about-visual { grid-template-columns: 1fr; }
  .hero-badges { flex-direction: column; gap: 10px; }
}