/* ============================================
   Solvaya — Theme Variables & Design System
   ============================================ */

:root {
  --color-primary: #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-primary-light: #DBEAFE;
  --color-primary-dark: #1E40AF;
  --color-accent: #059669;
  --color-accent-light: #D1FAE5;
  --color-danger: #DC2626;
  --color-danger-light: #FEE2E2;
  --color-warm: #F97316;

  --color-bg: #FFFAF5;
  --color-bg-alt: #FFF5ED;
  --color-bg-card: #FFFFFF;
  --color-text: #1A1525;
  --color-text-secondary: #6B6478;
  --color-text-muted: #9C94A8;
  --color-border: #E8E0D8;
  --color-border-light: #F0EBE5;

  --font-sans: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
}

.dark {
  --color-primary: #3B82F6;
  --color-primary-hover: #60A5FA;
  --color-primary-light: #1E3A5F;
  --color-primary-dark: #93C5FD;
  --color-accent: #34D399;
  --color-accent-light: #064E3B;
  --color-danger: #F87171;
  --color-danger-light: #451A1A;

  --color-bg: #0B1120;
  --color-bg-alt: #111827;
  --color-bg-card: #1E293B;
  --color-text: #F1F5F9;
  --color-text-secondary: #94A3B8;
  --color-text-muted: #64748B;
  --color-border: #1E293B;
  --color-border-light: #1E293B;
}

/* ============================================
   Base Styles
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

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

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4 {
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  line-height: 1.2;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary\:dark {
  background-color: var(--color-primary);
  color: white;
}

.btn-accent {
  background-color: var(--color-accent);
  color: white;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3);
}

.btn-accent:hover {
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.4);
}

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ============================================
   Calculator
   ============================================ */

.calc-number {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.calc-number-ota {
  color: var(--color-danger);
}

.calc-number-save {
  color: var(--color-accent);
}

.calc-number-cost {
  color: var(--color-text-secondary);
}

.calc-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-border);
  outline: none;
  transition: background 0.2s;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
  transition: transform 0.2s;
}

.calc-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.calc-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

input[type="number"].calc-input {
  -moz-appearance: textfield;
  appearance: textfield;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 1.5rem;
  padding: 0.75rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg-card);
  color: var(--color-text);
  width: 100%;
  transition: border-color 0.2s;
}

input[type="number"].calc-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

input[type="number"].calc-input::-webkit-outer-spin-button,
input[type="number"].calc-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.property-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  color: var(--color-text);
  font-size: 1.25rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.property-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.property-btn:active {
  transform: scale(0.95);
}

/* ============================================
   Trust Bar — Scrolling Logos
   ============================================ */

.trust-scroll {
  display: flex;
  gap: 3rem;
  animation: scrollLogos 40s linear infinite;
  width: max-content;
}

.trust-scroll:hover {
  animation-play-state: paused;
}

@keyframes scrollLogos {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.trust-logo {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: color 0.2s;
  letter-spacing: 0.02em;
}

.trust-logo:hover {
  color: var(--color-text);
}

/* ============================================
   Scroll Animations
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* ============================================
   Feature Page — Progress Indicator
   ============================================ */

.feature-progress {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  z-index: 40;
}

.feature-progress-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
  border: 2px solid transparent;
  transition: all 0.3s ease;
  cursor: pointer;
}

.feature-progress-dot.active {
  background: var(--color-primary);
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 4px var(--color-primary-light);
}

.dark .feature-progress-dot.active {
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3);
}

/* ============================================
   Feature Panels
   ============================================ */

.feature-panel {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 2rem;
  position: relative;
  overflow: hidden;
}

.feature-panel:nth-child(odd) {
  background: var(--color-bg);
}

.feature-panel:nth-child(even) {
  background: var(--color-bg-alt);
}

.feature-stat {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.875rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
}

/* ============================================
   Pricing
   ============================================ */

.pricing-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: 20px;
  padding: 3rem;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
  transition: border-color 0.3s;
}

.pricing-card:hover {
  border-color: var(--color-primary);
}

.pricing-card .price {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(3rem, 6vw, 4.5rem);
  letter-spacing: -0.03em;
  line-height: 1;
}

.pricing-card .price-currency {
  font-size: 0.4em;
  vertical-align: super;
  font-weight: 600;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
}

.pricing-feature-item + .pricing-feature-item {
  border-top: 1px solid var(--color-border-light);
}

/* FAQ Accordion */
.faq-item {
  border-bottom: 1px solid var(--color-border-light);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.05rem;
  text-align: left;
  transition: color 0.2s;
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 200px;
  padding-bottom: 1.25rem;
}

.faq-chevron {
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

/* ============================================
   Contact Form
   ============================================ */

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg-card);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-danger);
}

.form-error {
  color: var(--color-danger);
  font-size: 0.85rem;
  margin-top: 0.375rem;
  display: none;
}

.form-error.show {
  display: block;
}

.form-success {
  text-align: center;
  padding: 3rem 2rem;
}

.form-success-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  background: var(--color-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============================================
   Navigation
   ============================================ */

.nav-link {
  position: relative;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 2px solid var(--color-border);
  background: var(--color-bg-card);
  cursor: pointer;
  transition: all 0.2s;
  color: var(--color-text-secondary);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ============================================
   Mobile Menu
   ============================================ */

.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  font-size: 1.5rem;
  font-weight: 600;
}

/* ============================================
   Testimonial
   ============================================ */

.testimonial {
  position: relative;
  padding: 4rem 2rem;
  text-align: center;
}

.testimonial-quote {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 500;
  line-height: 1.7;
  max-width: 720px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  font-style: italic;
}

.testimonial-quote::before {
  content: '\201C';
  display: block;
  font-size: 4rem;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.3;
  margin-bottom: 1rem;
  font-style: normal;
}

.testimonial-attribution {
  margin-top: 1.5rem;
  font-weight: 600;
  font-style: normal;
  color: var(--color-text);
}

.testimonial-role {
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: normal;
}

/* ============================================
   Custom Section Divider
   ============================================ */

.section-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
  border: none;
  margin: 0;
}

/* ============================================
   Decorative elements
   ============================================ */

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glow-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent);
}

/* ============================================
   Container
   ============================================ */

.container-solvaya {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

@media (max-width: 640px) {
  .container-solvaya {
    padding: 0 1.25rem;
  }
}

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

.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 4rem 2rem 2rem;
}

.footer-link {
  color: var(--color-text-secondary);
  transition: color 0.2s;
  font-size: 0.9rem;
}

.footer-link:hover {
  color: var(--color-primary);
}

/* ============================================
   CTA Banner
   ============================================ */

.cta-banner {
  background: linear-gradient(135deg, var(--color-primary), #1D4ED8 50%, #7C3AED);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.dark .cta-banner {
  background: linear-gradient(135deg, #1E3A5F, var(--color-primary) 50%, #4C1D95);
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}

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

@media (max-width: 768px) {
  .feature-progress {
    display: none;
  }

  .feature-panel {
    min-height: auto;
    padding: 4rem 1.25rem;
  }

  .pricing-card {
    padding: 2rem 1.5rem;
  }
}