/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --color-bg: #222423;
  --color-primary: #e56517;
  --color-accent-white: #ffffff;
  --color-accent-light: #f0c5ab;
  --color-accent-medium: #ea9561;
  --color-text: #ffffff;
  --color-text-secondary: #f0c5ab;
  --color-text-muted: #ea9561;
  
  /* Grayscale */
  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-gray-700: #495057;
  --color-gray-800: #343a40;
  --color-gray-900: #212529;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ===== RESET & BASE STYLES ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-4);
  color: var(--color-text-secondary);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  min-height: 44px; /* Touch target */
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.btn--primary:hover {
  background-color: var(--color-accent-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn--secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  transform: translateY(-2px);
}

.btn--large {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(34, 36, 35, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(229, 101, 23, 0.2);
}

.nav__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-4) var(--spacing-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
}

.nav__toggle-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-normal);
}

.nav__menu {
  position: fixed;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-bg);
  padding: var(--spacing-8) var(--spacing-4);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.nav__menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav__list {
  list-style: none;
  margin-bottom: var(--spacing-8);
}

.nav__item {
  margin-bottom: var(--spacing-4);
}

.nav__link {
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--font-size-lg);
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link:focus {
  color: var(--color-primary);
}

.nav__cta {
  width: 100%;
  justify-content: center;
}

/* ===== HERO ===== */
.hero {
  padding: calc(80px + var(--spacing-16)) var(--spacing-4) var(--spacing-16);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero__container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: var(--spacing-12);
  align-items: center;
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-6);
}

.hero__title-accent {
  color: var(--color-primary);
  display: block;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-8);
  max-width: 600px;
}

.hero__cta {
  margin-bottom: var(--spacing-8);
}

.hero__cta-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-2);
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__phone {
  width: 280px;
  height: 560px;
  background: linear-gradient(145deg, #2a2d2b, #1e201f);
  border-radius: 30px;
  padding: var(--spacing-6);
  box-shadow: var(--shadow-xl);
  position: relative;
}

.hero__phone::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background-color: var(--color-gray-600);
  border-radius: 2px;
}

.hero__phone-screen {
  width: 100%;
  height: 100%;
  background-color: var(--color-gray-100);
  border-radius: 20px;
  padding: var(--spacing-4);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.hero__chat {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.hero__chat-bubble {
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: 18px;
  max-width: 80%;
  font-size: var(--font-size-sm);
  animation: fadeInUp 0.6s ease-out;
}

.hero__chat-bubble--user {
  background-color: var(--color-primary);
  color: white;
  align-self: flex-end;
  animation-delay: 0.2s;
}

.hero__chat-bubble--ai {
  background-color: var(--color-gray-200);
  color: var(--color-gray-800);
  align-self: flex-start;
  animation-delay: 0.4s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== SECTIONS ===== */
.section__title {
  text-align: center;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-4);
}

.section__subtitle {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-12);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== PRODUCTS ===== */
.products {
  padding: var(--spacing-20) var(--spacing-4);
  background-color: rgba(229, 101, 23, 0.05);
}

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

.products__grid {
  display: grid;
  gap: var(--spacing-8);
  grid-template-columns: 1fr;
}

.product-card {
  background-color: var(--color-bg);
  padding: var(--spacing-8);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(229, 101, 23, 0.2);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-medium));
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.product-card__icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-4);
}

.product-card__title {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

.product-card__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-6);
}

.product-card__features {
  list-style: none;
  margin-bottom: var(--spacing-8);
}

.product-card__features li {
  padding: var(--spacing-2) 0;
  color: var(--color-text-secondary);
  position: relative;
  padding-left: var(--spacing-6);
}

.product-card__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
  padding: var(--spacing-20) var(--spacing-4);
}

.how-it-works__container {
  max-width: 1200px;
  margin: 0 auto;
}

.how-it-works__steps {
  display: grid;
  gap: var(--spacing-12);
  grid-template-columns: 1fr;
}

.step {
  text-align: center;
  position: relative;
}

.step__number {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-medium));
  color: var(--color-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin: 0 auto var(--spacing-6);
  box-shadow: var(--shadow-lg);
}

.step__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-4);
}

.step__description {
  color: var(--color-text-secondary);
  max-width: 400px;
  margin: 0 auto;
}

/* ===== BENEFITS ===== */
.benefits {
  padding: var(--spacing-20) var(--spacing-4);
  background-color: rgba(229, 101, 23, 0.05);
}

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

.benefits__grid {
  display: grid;
  gap: var(--spacing-8);
  grid-template-columns: 1fr;
}

.benefit {
  text-align: center;
  padding: var(--spacing-8);
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(229, 101, 23, 0.2);
  transition: all var(--transition-normal);
}

.benefit:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.benefit__icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-4);
}

.benefit__title {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.benefit__description {
  color: var(--color-text-secondary);
}

/* ===== USE CASES ===== */
.use-cases {
  padding: var(--spacing-20) var(--spacing-4);
}

.use-cases__container {
  max-width: 1200px;
  margin: 0 auto;
}

.use-cases__grid {
  display: grid;
  gap: var(--spacing-8);
  grid-template-columns: 1fr;
}

.use-case {
  text-align: center;
  padding: var(--spacing-8);
  background-color: rgba(229, 101, 23, 0.05);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(229, 101, 23, 0.2);
  transition: all var(--transition-normal);
}

.use-case:hover {
  transform: translateY(-4px);
  background-color: rgba(229, 101, 23, 0.1);
}

.use-case__icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-4);
}

.use-case__title {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.use-case__description {
  color: var(--color-text-secondary);
}

/* ===== TESTIMONIALS ===== */
.testimonials {
  padding: var(--spacing-20) var(--spacing-4);
  background-color: rgba(229, 101, 23, 0.05);
}

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

.testimonials__grid {
  display: grid;
  gap: var(--spacing-8);
  grid-template-columns: 1fr;
}

.testimonial {
  background-color: var(--color-bg);
  padding: var(--spacing-8);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(229, 101, 23, 0.2);
  transition: all var(--transition-normal);
}

.testimonial:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.testimonial__text {
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-6);
  position: relative;
}

.testimonial__text::before {
  content: '"';
  font-size: var(--font-size-4xl);
  color: var(--color-primary);
  position: absolute;
  top: -10px;
  left: -10px;
}

.testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.testimonial__avatar {
  width: 60px;
  height: 60px;
  background-color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
}

.testimonial__name {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-1);
}

.testimonial__company {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ===== FAQ ===== */
.faq {
  padding: var(--spacing-20) var(--spacing-4);
}

.faq__container {
  max-width: 800px;
  margin: 0 auto;
}

.faq__list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.faq__item {
  background-color: var(--color-bg);
  border: 1px solid rgba(229, 101, 23, 0.2);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq__question {
  width: 100%;
  padding: var(--spacing-6);
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-fast);
}

.faq__question:hover {
  background-color: rgba(229, 101, 23, 0.05);
}

.faq__question[aria-expanded="true"] {
  background-color: rgba(229, 101, 23, 0.1);
}

.faq__icon {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq__question[aria-expanded="true"] .faq__icon {
  transform: rotate(45deg);
}

.faq__answer {
  padding: 0 var(--spacing-6) var(--spacing-6);
  color: var(--color-text-secondary);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq__answer.active {
  max-height: 200px;
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--color-gray-900);
  padding: var(--spacing-16) var(--spacing-4) var(--spacing-8);
  border-top: 1px solid rgba(229, 101, 23, 0.2);
}

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

.footer__content {
  display: grid;
  gap: var(--spacing-8);
  grid-template-columns: 1fr;
  margin-bottom: var(--spacing-8);
}

.footer__logo {
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.footer__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-6);
}

.footer__title {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

.footer__phone,
.footer__email {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2);
}

.footer__cta {
  text-align: center;
}

.footer__bottom {
  text-align: center;
  padding-top: var(--spacing-8);
  border-top: 1px solid rgba(229, 101, 23, 0.2);
}

.footer__copyright {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (min-width: 640px) {
  .hero__title {
    font-size: var(--font-size-5xl);
  }
  
  .hero__container {
    grid-template-columns: 1fr 1fr;
  }
  
  .products__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .how-it-works__steps {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .benefits__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .use-cases__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .testimonials__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer__content {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }
  
  .nav__menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: none;
    padding: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
  }
  
  .nav__list {
    display: flex;
    gap: var(--spacing-6);
    margin-bottom: 0;
  }
  
  .nav__item {
    margin-bottom: 0;
  }
  
  .nav__link {
    font-size: var(--font-size-base);
  }
  
  .nav__cta {
    width: auto;
  }
  
  .hero__title {
    font-size: 4rem;
  }
  
  .products__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: 4.5rem;
  }
  
  .products__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .benefits__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1280px) {
  .products__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Focus styles for keyboard navigation */
*:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-bg: #000000;
    --color-text: #ffffff;
    --color-primary: #ff6600;
  }
}

/* Print styles */
@media print {
  .header,
  .footer,
  .btn {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}