/* ============================================================
   THERMOLUZ — Main Stylesheet
   Industrial Premium | Performance-First
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--tl-font-body); font-size: var(--tl-text-base); line-height: var(--tl-leading-normal); color: var(--tl-text-body); background: var(--tl-bg-primary); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, textarea, select { font: inherit; color: inherit; border: none; background: none; outline: none; }
button { cursor: pointer; }

/* === AUTH OVERLAY === */
.auth-overlay {
  position: fixed; inset: 0; z-index: 10000;
  background: var(--tl-gradient-hero);
  display: flex; align-items: center; justify-content: center;
  opacity: 1; transition: opacity 0.5s ease;
}
.auth-overlay.hidden { opacity: 0; pointer-events: none; }
.auth-box {
  background: var(--tl-white); border-radius: var(--tl-radius-xl);
  padding: var(--tl-space-10); width: 90%; max-width: 400px;
  box-shadow: var(--tl-shadow-xl); text-align: center;
}
.auth-box h2 { color: var(--tl-blue-900); font-size: var(--tl-text-2xl); font-weight: 700; margin-bottom: var(--tl-space-2); }
.auth-box p { color: var(--tl-gray-500); font-size: var(--tl-text-sm); margin-bottom: var(--tl-space-6); }
.auth-box input {
  width: 100%; padding: var(--tl-space-3) var(--tl-space-4);
  border: 2px solid var(--tl-gray-200); border-radius: var(--tl-radius-md);
  font-size: var(--tl-text-base); margin-bottom: var(--tl-space-3);
  transition: border-color var(--tl-transition-fast);
}
.auth-box input:focus { border-color: var(--tl-blue-400); }
.auth-box .auth-btn {
  width: 100%; padding: var(--tl-space-3) var(--tl-space-6);
  background: var(--tl-gradient-cta); color: var(--tl-cta-primary-text);
  font-weight: 700; font-size: var(--tl-text-base); border-radius: var(--tl-radius-md);
  transition: all var(--tl-transition-fast); margin-top: var(--tl-space-2);
}
.auth-box .auth-btn:hover { transform: translateY(-1px); box-shadow: var(--tl-shadow-glow-red); }
.auth-error { color: var(--tl-red-500); font-size: var(--tl-text-sm); margin-top: var(--tl-space-2); display: none; }

/* === CONTAINER === */
.container { width: 100%; max-width: var(--tl-container-xl); margin: 0 auto; padding: 0 var(--tl-space-6); }
.container-narrow { max-width: var(--tl-container-lg); }

/* === HEADER / NAV === */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--tl-border);
  transition: all var(--tl-transition-base);
}
.header.scrolled { box-shadow: var(--tl-shadow-md); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; max-width: var(--tl-container-xl); margin: 0 auto;
  padding: 0 var(--tl-space-6);
}
.logo { display: flex; align-items: center; gap: var(--tl-space-3); }
.logo-icon {
  width: 44px; height: 44px; background: var(--tl-gradient-hero);
  border-radius: var(--tl-radius-md); display: flex; align-items: center;
  justify-content: center; position: relative; overflow: hidden;
}
.logo-icon::after {
  content: ''; position: absolute; width: 16px; height: 16px;
  border: 2px solid var(--tl-red-400); border-radius: 50%;
  top: 50%; left: 50%; transform: translate(-50%, -50%);
}
.logo-icon svg { width: 24px; height: 24px; fill: var(--tl-red-400); position: relative; z-index: 1; }
.logo-text { font-size: var(--tl-text-xl); font-weight: 800; color: var(--tl-blue-900); letter-spacing: var(--tl-tracking-tight); }
.logo-text span { color: var(--tl-red-500); }

.nav { display: flex; align-items: center; gap: var(--tl-space-8); }
.nav a {
  font-size: var(--tl-text-sm); font-weight: 500; color: var(--tl-gray-600);
  transition: color var(--tl-transition-fast); position: relative;
}
.nav a:hover { color: var(--tl-blue-600); }
.nav a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--tl-red-500); transition: width var(--tl-transition-fast);
}
.nav a:hover::after { width: 100%; }

.header-cta {
  display: inline-flex; align-items: center; gap: var(--tl-space-2);
  padding: var(--tl-space-2) var(--tl-space-5);
  background: var(--tl-gradient-cta); color: var(--tl-cta-primary-text);
  font-weight: 700; font-size: var(--tl-text-sm); border-radius: var(--tl-radius-full);
  transition: all var(--tl-transition-fast);
}
.header-cta:hover { transform: translateY(-1px); box-shadow: var(--tl-shadow-glow-red); }

/* Mobile menu */
.menu-toggle { display: none; width: 32px; height: 32px; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--tl-blue-900); transition: all var(--tl-transition-fast); border-radius: 2px; }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-nav {
  display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0;
  background: var(--tl-white); z-index: 999; padding: var(--tl-space-8);
  flex-direction: column; gap: var(--tl-space-6);
  transform: translateX(100%); transition: transform var(--tl-transition-base);
}
.mobile-nav.active { transform: translateX(0); }
.mobile-nav a { font-size: var(--tl-text-lg); font-weight: 600; color: var(--tl-blue-900); padding: var(--tl-space-3) 0; border-bottom: 1px solid var(--tl-gray-100); }

/* === HERO === */
.hero {
  position: relative; min-height: 90vh; display: flex; align-items: center;
  background: var(--tl-gradient-hero); overflow: hidden; padding-top: 72px;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 50%, rgba(220,38,38,0.08) 0%, transparent 60%),
              radial-gradient(circle at 20% 80%, rgba(220,38,38,0.05) 0%, transparent 50%);
}
.hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
  background: linear-gradient(to top, var(--tl-white), transparent);
}
.hero-grid {
  position: absolute; inset: 0; opacity: 0.04;
  background-image: linear-gradient(rgba(255,255,255,0.3) 1px, transparent 1px),
                     linear-gradient(90deg, rgba(255,255,255,0.3) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-content { position: relative; z-index: 2; max-width: 680px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: var(--tl-space-2);
  padding: var(--tl-space-2) var(--tl-space-4);
  background: rgba(220,38,38,0.15); border: 1px solid rgba(220,38,38,0.3);
  border-radius: var(--tl-radius-full); color: var(--tl-red-300);
  font-size: var(--tl-text-xs); font-weight: 600; text-transform: uppercase;
  letter-spacing: var(--tl-tracking-wider); margin-bottom: var(--tl-space-6);
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem); font-weight: 900;
  color: var(--tl-white); line-height: var(--tl-leading-tight);
  letter-spacing: var(--tl-tracking-tight); margin-bottom: var(--tl-space-6);
}
.hero h1 .highlight { color: var(--tl-red-400); }
.hero-sub {
  font-size: var(--tl-text-lg); color: var(--tl-text-on-dark-muted);
  line-height: var(--tl-leading-relaxed); margin-bottom: var(--tl-space-8);
  max-width: 560px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--tl-space-4); }
.hero-visual {
  position: absolute; right: -5%; top: 50%; transform: translateY(-50%);
  width: 45%; max-width: 600px; z-index: 1; opacity: 0.9;
}
.hero-visual img { width: 100%; filter: drop-shadow(0 20px 40px rgba(0,0,0,0.3)); }

/* === BUTTONS === */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--tl-space-2);
  padding: var(--tl-space-3) var(--tl-space-8); font-weight: 700;
  font-size: var(--tl-text-base); border-radius: var(--tl-radius-md);
  transition: all var(--tl-transition-fast); white-space: nowrap;
}
.btn-primary {
  background: var(--tl-gradient-cta); color: var(--tl-cta-primary-text);
  box-shadow: 0 2px 8px rgba(220,38,38,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(220,38,38,0.4); }
.btn-secondary {
  background: transparent; color: var(--tl-white);
  border: 2px solid rgba(255,255,255,0.3);
}
.btn-secondary:hover { border-color: var(--tl-white); background: rgba(255,255,255,0.1); }
.btn-outline {
  background: transparent; color: var(--tl-blue-600);
  border: 2px solid var(--tl-blue-600);
}
.btn-outline:hover { background: var(--tl-blue-600); color: var(--tl-white); }
.btn-dark {
  background: var(--tl-blue-900); color: var(--tl-white);
}
.btn-dark:hover { background: var(--tl-blue-800); transform: translateY(-1px); }
.btn-lg { padding: var(--tl-space-4) var(--tl-space-10); font-size: var(--tl-text-lg); }
.btn-sm { padding: var(--tl-space-2) var(--tl-space-5); font-size: var(--tl-text-sm); }
.btn-icon { width: 20px; height: 20px; }

/* === SECTIONS === */
.section {
  padding: var(--tl-space-20) 0;
  position: relative;
}
.section-alt { background: var(--tl-bg-section-alt); }
.section-dark { background: var(--tl-gradient-dark); color: var(--tl-white); }
.section-dark .section-title { color: var(--tl-white); }
.section-dark .section-subtitle { color: var(--tl-text-on-dark-muted); }

.section-header { text-align: center; max-width: 720px; margin: 0 auto var(--tl-space-12); }
.section-tag {
  display: inline-flex; align-items: center; gap: var(--tl-space-2);
  font-size: var(--tl-text-xs); font-weight: 700; text-transform: uppercase;
  letter-spacing: var(--tl-tracking-wider); color: var(--tl-red-600);
  margin-bottom: var(--tl-space-4);
}
.section-tag::before {
  content: ''; width: 24px; height: 2px; background: var(--tl-red-500);
}
.section-title {
  font-size: clamp(1.875rem, 3.5vw, 2.75rem); font-weight: 800;
  color: var(--tl-text-heading); line-height: var(--tl-leading-tight);
  letter-spacing: var(--tl-tracking-tight); margin-bottom: var(--tl-space-4);
}
.section-subtitle {
  font-size: var(--tl-text-lg); color: var(--tl-text-muted);
  line-height: var(--tl-leading-relaxed); max-width: 600px; margin: 0 auto;
}

/* === CARDS === */
.card {
  background: var(--tl-bg-card); border-radius: var(--tl-radius-lg);
  border: 1px solid var(--tl-border); padding: var(--tl-space-8);
  transition: all var(--tl-transition-base);
}
.card:hover {
  border-color: var(--tl-blue-200); box-shadow: var(--tl-shadow-card-hover);
  transform: translateY(-4px);
}
.card-icon {
  width: 56px; height: 56px; border-radius: var(--tl-radius-md);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--tl-space-5);
}
.card-icon-blue { background: var(--tl-blue-50); color: var(--tl-blue-600); }
.card-icon-red-light { background: rgba(220,38,38,0.08); color: var(--tl-red-600); }
.card-icon-red { background: rgba(220,38,38,0.08); color: var(--tl-red-500); }
.card-icon svg { width: 28px; height: 28px; }
.card h3 {
  font-size: var(--tl-text-xl); font-weight: 700; color: var(--tl-text-heading);
  margin-bottom: var(--tl-space-3);
}
.card p { color: var(--tl-text-muted); line-height: var(--tl-leading-relaxed); }

/* Product card */
.product-card {
  background: var(--tl-bg-card); border-radius: var(--tl-radius-lg);
  border: 1px solid var(--tl-border); overflow: hidden;
  transition: all var(--tl-transition-base);
}
.product-card:hover { border-color: var(--tl-blue-200); box-shadow: var(--tl-shadow-card-hover); transform: translateY(-4px); }
.product-card-img {
  width: 100%; height: 220px; background: var(--tl-gray-100);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; position: relative;
}
.product-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--tl-transition-slow); }
.product-card:hover .product-card-img img { transform: scale(1.05); }
.product-card-body { padding: var(--tl-space-6); }
.product-card-body h3 { font-size: var(--tl-text-lg); font-weight: 700; color: var(--tl-text-heading); margin-bottom: var(--tl-space-2); }
.product-card-body p { font-size: var(--tl-text-sm); color: var(--tl-text-muted); margin-bottom: var(--tl-space-4); line-height: var(--tl-leading-relaxed); }
.product-card-link {
  display: inline-flex; align-items: center; gap: var(--tl-space-2);
  font-size: var(--tl-text-sm); font-weight: 600; color: var(--tl-blue-600);
  transition: gap var(--tl-transition-fast);
}
.product-card:hover .product-card-link { gap: var(--tl-space-3); }

/* === GRID === */
.grid { display: grid; gap: var(--tl-space-8); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

/* === STATS BAR === */
.stats-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--tl-space-8);
  padding: var(--tl-space-12) 0;
}
.stat { text-align: center; }
.stat-number {
  font-size: var(--tl-text-4xl); font-weight: 900; color: var(--tl-red-400);
  line-height: 1; margin-bottom: var(--tl-space-2);
}
.stat-label {
  font-size: var(--tl-text-sm); color: var(--tl-text-on-dark-muted);
  text-transform: uppercase; letter-spacing: var(--tl-tracking-wide);
}

/* === PROCESS STEPS === */
.process-steps { display: flex; gap: var(--tl-space-6); position: relative; }
.process-step {
  flex: 1; text-align: center; padding: var(--tl-space-8) var(--tl-space-4);
  position: relative;
}
.step-number {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--tl-gradient-cta); color: var(--tl-blue-900);
  font-weight: 800; font-size: var(--tl-text-lg);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--tl-space-4); position: relative; z-index: 2;
}
.process-step h4 { font-size: var(--tl-text-base); font-weight: 700; color: var(--tl-text-heading); margin-bottom: var(--tl-space-2); }
.process-step p { font-size: var(--tl-text-sm); color: var(--tl-text-muted); }
.process-step:not(:last-child)::after {
  content: ''; position: absolute; top: 48px; right: -24px;
  width: 48px; height: 2px; background: var(--tl-gray-200); z-index: 1;
}

/* === TRUST / LOGOS === */
.trust-bar {
  display: flex; align-items: center; justify-content: center;
  gap: var(--tl-space-12); flex-wrap: wrap; padding: var(--tl-space-8) 0;
  opacity: 0.5;
}
.trust-bar img { height: 36px; filter: grayscale(1); transition: all var(--tl-transition-fast); }
.trust-bar img:hover { filter: grayscale(0); opacity: 1; }

/* === FAQ === */
.faq-item { border-bottom: 1px solid var(--tl-border); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--tl-space-5) 0; cursor: pointer;
  font-size: var(--tl-text-lg); font-weight: 600; color: var(--tl-text-heading);
  transition: color var(--tl-transition-fast);
}
.faq-question:hover { color: var(--tl-blue-600); }
.faq-chevron {
  width: 20px; height: 20px; transition: transform var(--tl-transition-fast);
  color: var(--tl-gray-400); flex-shrink: 0;
}
.faq-item.active .faq-chevron { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height var(--tl-transition-base);
}
.faq-answer-inner {
  padding: 0 0 var(--tl-space-5); color: var(--tl-text-muted);
  line-height: var(--tl-leading-relaxed);
}
.faq-item.active .faq-answer { max-height: 500px; }

/* === FORM === */
.form-group { margin-bottom: var(--tl-space-5); }
.form-label {
  display: block; font-size: var(--tl-text-sm); font-weight: 600;
  color: var(--tl-text-heading); margin-bottom: var(--tl-space-2);
}
.form-input, .form-textarea, .form-select {
  width: 100%; padding: var(--tl-space-3) var(--tl-space-4);
  border: 2px solid var(--tl-border); border-radius: var(--tl-radius-md);
  font-size: var(--tl-text-base); transition: border-color var(--tl-transition-fast);
  background: var(--tl-white);
}
.form-input:focus, .form-textarea:focus, .form-select:focus { border-color: var(--tl-blue-400); }
.form-textarea { min-height: 120px; resize: vertical; }

/* === FOOTER === */
.footer { background: var(--tl-blue-900); color: var(--tl-white); padding: var(--tl-space-16) 0 var(--tl-space-8); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--tl-space-12); margin-bottom: var(--tl-space-12); }
.footer-brand p { color: var(--tl-text-on-dark-muted); font-size: var(--tl-text-sm); line-height: var(--tl-leading-relaxed); margin-top: var(--tl-space-4); }
.footer-col h4 {
  font-size: var(--tl-text-sm); font-weight: 700; text-transform: uppercase;
  letter-spacing: var(--tl-tracking-wider); margin-bottom: var(--tl-space-5);
  color: var(--tl-red-400);
}
.footer-col a {
  display: block; font-size: var(--tl-text-sm); color: var(--tl-text-on-dark-muted);
  padding: var(--tl-space-1) 0; transition: color var(--tl-transition-fast);
}
.footer-col a:hover { color: var(--tl-white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--tl-space-8);
  display: flex; justify-content: space-between; align-items: center;
  font-size: var(--tl-text-sm); color: var(--tl-text-on-dark-muted);
}

/* === WHATSAPP FLOAT === */
.whatsapp-float {
  position: fixed; bottom: 24px; right: 24px; z-index: 900;
  width: 56px; height: 56px; background: #25d366; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(37,211,102,0.4);
  transition: all var(--tl-transition-fast);
}
.whatsapp-float:hover { transform: scale(1.1); box-shadow: 0 6px 20px rgba(37,211,102,0.5); }
.whatsapp-float svg { width: 28px; height: 28px; fill: white; }

/* === ANIMATIONS === */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .nav { display: none; }
  .header-cta.desktop-only { display: none; }
  .menu-toggle { display: flex; }
  .mobile-nav { display: flex; }
  .hero { min-height: auto; padding: calc(72px + var(--tl-space-16)) 0 var(--tl-space-16); }
  .hero-visual { display: none; }
  .hero-content { max-width: 100%; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .process-steps { flex-direction: column; }
  .process-step:not(:last-child)::after { display: none; }
}
@media (max-width: 768px) {
  .section { padding: var(--tl-space-12) 0; }
  .hero h1 { font-size: var(--tl-text-3xl); }
  .section-title { font-size: var(--tl-text-2xl); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--tl-space-4); text-align: center; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* === UTILITY === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.text-red { color: var(--tl-red-500); }
.text-blue { color: var(--tl-blue-600); }
.text-red { color: var(--tl-red-500); }
.bg-red { background-color: var(--tl-red-500); }
.mt-4 { margin-top: var(--tl-space-4); }
.mt-8 { margin-top: var(--tl-space-8); }
.mb-4 { margin-bottom: var(--tl-space-4); }
.mb-8 { margin-bottom: var(--tl-space-8); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }