/* ===== VARIABLES CSS ===== */
:root {
  /* Colors */
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: #60A5FA;
  --color-secondary: #14B8A6;
  --color-secondary-dark: #0F766E;
  --color-accent: #F97316;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  
  /* Light theme */
  --color-background: #FFFFFF;
  --color-surface: #F8FAFC;
  --color-surface-alt: #F1F5F9;
  --color-text: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-muted: #94A3B8;
  --color-border: #E2E8F0;
  --color-shadow: rgba(15, 23, 42, 0.08);
  --color-shadow-lg: rgba(15, 23, 42, 0.12);
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, 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;
  --font-size-6xl: 3.75rem;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* 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;
  --spacing-32: 8rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow-lg);
  --shadow-xl: 0 20px 25px -5px var(--color-shadow-lg);
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* Dark theme */
[data-theme="dark"] {
  --color-background: #0F172A;
  --color-surface: #1E293B;
  --color-surface-alt: #334155;
  --color-text: #F8FAFC;
  --color-text-secondary: #CBD5E1;
  --color-text-muted: #94A3B8;
  --color-border: #475569;
  --color-shadow: rgba(0, 0, 0, 0.25);
  --color-shadow-lg: rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

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);
  line-height: var(--line-height-relaxed);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.section {
  padding: var(--spacing-20) 0;
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-16);
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-4);
  color: var(--color-text);
}

.section__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-surface-alt);
  transform: translateY(-1px);
}

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

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

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

.btn__icon {
  width: 1.25em;
  height: 1.25em;
  fill: currentColor;
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav__logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__menu {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  position: relative;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

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

.theme-toggle {
  background: none;
  border: none;
  padding: var(--spacing-2);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-surface);
}

.theme-toggle__icon {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--color-text-secondary);
}

.theme-toggle__icon--dark {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--light {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--dark {
  display: block;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  cursor: pointer;
  padding: var(--spacing-2);
}

.nav__toggle-line {
  width: 1.5rem;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

.nav__close {
  display: none;
  cursor: pointer;
  padding: var(--spacing-2);
}

.nav__close-icon {
  width: 1.5rem;
  height: 1.5rem;
  fill: var(--color-text);
}

/* ===== HERO ===== */
.hero {
  padding: var(--spacing-32) 0 var(--spacing-20);
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><polygon fill="%23f1f5f9" fill-opacity="0.3" points="0,1000 1000,0 1000,1000"/></svg>') no-repeat center;
  background-size: cover;
  opacity: 0.5;
}

.hero__container {
  position: relative;
  z-index: 1;
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: center;
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-6);
}

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

.hero__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-8);
  line-height: var(--line-height-relaxed);
}

.hero__actions {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

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

.hero__image {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transform: rotate(3deg);
  transition: transform var(--transition-slow);
}

.hero__image:hover {
  transform: rotate(0deg) scale(1.05);
}

.hero__img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  display: block;
}

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

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-8);
}

.service__card {
  background: var(--color-background);
  padding: var(--spacing-8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--color-border);
}

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

.service__icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: var(--spacing-6);
}

.service__icon svg {
  width: 100%;
  height: 100%;
  fill: var(--color-primary);
}

.service__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-4);
  color: var(--color-text);
}

.service__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><circle cx="500" cy="200" r="300" fill="%23ffffff" fill-opacity="0.05"/><circle cx="800" cy="800" r="200" fill="%23ffffff" fill-opacity="0.03"/></svg>') no-repeat center;
  background-size: cover;
}

.cta__container {
  position: relative;
  z-index: 1;
}

.cta__content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.cta__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-6);
  color: white;
}

.cta__description {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-8);
  color: rgba(255, 255, 255, 0.9);
  line-height: var(--line-height-relaxed);
}

.cta__actions {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
  flex-wrap: wrap;
}

.cta .btn--primary {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.cta .btn--outline {
  border-color: rgba(255, 255, 255, 0.5);
  color: white;
}

.cta .btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

/* ===== PAGE CONTENT ===== */
.page-content {
  min-height: 60vh;
}

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

.page__header {
  text-align: center;
  margin-bottom: var(--spacing-16);
}

.page__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

/* ===== ERROR 404 ===== */
.error-404 {
  text-align: center;
  padding: var(--spacing-32) 0;
  min-height: 60vh;
  display: flex;
  align-items: center;
}

.error-404__title {
  font-size: var(--font-size-6xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.error-404__subtitle {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-6);
}

.error-404__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-8);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-20) 0 var(--spacing-8);
}

.footer__content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-12);
  margin-bottom: var(--spacing-12);
}

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

.footer__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

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

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

.footer__info-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.footer__icon {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--color-primary);
  flex-shrink: 0;
}

.footer__link {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

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

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.footer__social {
  display: flex;
  gap: var(--spacing-4);
}

.footer__social-link {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-background);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  border: 1px solid var(--color-border);
}

.footer__social-link:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.footer__social-link svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--color-text-secondary);
  transition: fill var(--transition-fast);
}

.footer__social-link:hover svg {
  fill: white;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

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

.footer__legal {
  display: flex;
  gap: var(--spacing-6);
}

.footer__legal .footer__link {
  font-size: var(--font-size-sm);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-2rem);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(2rem);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-left {
  animation: fadeInLeft 0.6s ease-out;
}

.animate-fade-in-right {
  animation: fadeInRight 0.6s ease-out;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-6);
  }
  
  .hero__content {
    grid-template-columns: 1fr;
    gap: var(--spacing-12);
    text-align: center;
  }
  
  .hero__title {
    font-size: var(--font-size-4xl);
  }
  
  .services__grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
  }
}

@media (max-width: 768px) {
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background: var(--color-background);
    flex-direction: column;
    justify-content: center;
    transition: right var(--transition-base);
    z-index: var(--z-modal);
  }
  
  .nav__menu.show {
    right: 0;
  }
  
  .nav__list {
    flex-direction: column;
    gap: var(--spacing-8);
  }
  
  .nav__link {
    font-size: var(--font-size-xl);
  }
  
  .nav__close {
    display: block;
    position: absolute;
    top: var(--spacing-6);
    right: var(--spacing-6);
  }
  
  .nav__toggle {
    display: flex;
  }
  
  .nav__toggle.active .nav__toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(0.5rem, 0.5rem);
  }
  
  .nav__toggle.active .nav__toggle-line:nth-child(2) {
    opacity: 0;
  }
  
  .nav__toggle.active .nav__toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(0.5rem, -0.5rem);
  }
  
  .hero {
    padding: var(--spacing-24) 0 var(--spacing-16);
  }
  
  .hero__title {
    font-size: var(--font-size-3xl);
  }
  
  .hero__actions {
    justify-content: center;
  }
  
  .hero__img {
    height: 300px;
  }
  
  .section {
    padding: var(--spacing-16) 0;
  }
  
  .section__title {
    font-size: var(--font-size-2xl);
  }
  
  .cta__title {
    font-size: var(--font-size-3xl);
  }
  
  .cta__actions {
    flex-direction: column;
    align-items: center;
  }
  
  .footer__content {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
  }
  
  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-4);
  }
  
  .hero__title {
    font-size: var(--font-size-2xl);
  }
  
  .hero__description {
    font-size: var(--font-size-base);
  }
  
  .btn {
    padding: var(--spacing-3) var(--spacing-5);
    font-size: var(--font-size-sm);
  }
  
  .btn--large {
    padding: var(--spacing-4) var(--spacing-6);
    font-size: var(--font-size-base);
  }
  
  .service__card {
    padding: var(--spacing-6);
  }
  
  .services__grid {
    grid-template-columns: 1fr;
  }
}

/* ===== UTILITIES ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }

.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

.mt-4 { margin-top: var(--spacing-4); }
.mb-4 { margin-bottom: var(--spacing-4); }
.ml-4 { margin-left: var(--spacing-4); }
.mr-4 { margin-right: var(--spacing-4); }

.pt-4 { padding-top: var(--spacing-4); }
.pb-4 { padding-bottom: var(--spacing-4); }
.pl-4 { padding-left: var(--spacing-4); }
.pr-4 { padding-right: var(--spacing-4); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }