/* =============================================================================
   DANTEO DIGITAL - MAIN STYLESHEET
   Dark theme, modern, responsive design
   ============================================================================= */

/* CSS Custom Properties (Variables) */
:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #1a1a1a;
  --color-bg-card: #1f1f1f;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b3b3b3;
  --color-text-muted: #737373;
  
  /* Accent Colors */
  --color-accent-blue: #0066cc;
  --color-accent-teal: #00b4a6;
  --color-accent-blue-hover: #0052a3;
  --color-accent-teal-hover: #008a80;
  
  /* Border & Dividers */
  --color-border: #2a2a2a;
  --color-border-light: #333333;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-teal) 100%);
  --gradient-bg: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0f0f0f 100%);
  
  /* 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-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --transition: all 0.3s ease;
  --header-height: 70px;
}

/* =============================================================================
   RESET & BASE STYLES
   ============================================================================= */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--gradient-bg);
  min-height: 100vh;
}

/* Skip to content for accessibility */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-accent-blue);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--border-radius);
  z-index: 1000;
  transition: top 0.3s;
}

.skip-to-content:focus {
  top: 6px;
}

/* =============================================================================
   TYPOGRAPHY
   ============================================================================= */

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

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

a {
  color: var(--color-accent-blue);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-accent-blue-hover);
}

ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

/* =============================================================================
   LAYOUT COMPONENTS
   ============================================================================= */

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section--hero {
  padding: var(--spacing-4xl) 0;
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
}

/* =============================================================================
   HEADER & NAVIGATION
   ============================================================================= */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  height: var(--header-height);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.logo__text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: none;
}

@media (min-width: 768px) {
  .nav {
    display: flex;
  }
}

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

.nav__link {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width 0.3s ease;
}

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

/* Mobile Menu */
.mobile-menu-toggle {
  display: block;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  transform: translateY(-100%);
  transition: transform 0.3s ease;
  z-index: 999;
}

.mobile-nav--open {
  transform: translateY(0);
}

.mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: var(--spacing-md) 0;
}

.mobile-nav__item {
  margin: 0;
}

.mobile-nav__link {
  display: block;
  padding: var(--spacing-md) var(--spacing-xl);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.mobile-nav__link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

/* =============================================================================
   HERO SECTION
   ============================================================================= */

.hero {
  text-align: center;
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
}

/* AI Network Background */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 15% 25%, rgba(0, 102, 204, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 85% 75%, rgba(0, 180, 166, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 10%, rgba(0, 102, 204, 0.08) 0%, transparent 60%);
  z-index: 1;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    /* Network nodes */
    radial-gradient(circle at 20% 30%, rgba(0, 102, 204, 0.6) 1px, transparent 1px),
    radial-gradient(circle at 80% 20%, rgba(0, 180, 166, 0.5) 1px, transparent 1px),
    radial-gradient(circle at 30% 70%, rgba(0, 102, 204, 0.4) 1px, transparent 1px),
    radial-gradient(circle at 70% 80%, rgba(0, 180, 166, 0.6) 1px, transparent 1px),
    radial-gradient(circle at 60% 40%, rgba(0, 102, 204, 0.3) 1px, transparent 1px),
    radial-gradient(circle at 40% 90%, rgba(0, 180, 166, 0.4) 1px, transparent 1px),
    /* Connection lines */
    linear-gradient(35deg, transparent 48%, rgba(0, 102, 204, 0.2) 50%, transparent 52%),
    linear-gradient(145deg, transparent 48%, rgba(0, 180, 166, 0.15) 50%, transparent 52%),
    linear-gradient(65deg, transparent 48%, rgba(0, 102, 204, 0.1) 50%, transparent 52%);
  background-size: 
    100% 100%, 100% 100%, 100% 100%, 100% 100%, 100% 100%, 100% 100%,
    200px 200px, 300px 300px, 250px 250px;
  background-position: 
    0 0, 0 0, 0 0, 0 0, 0 0, 0 0,
    0 0, 100px 100px, 150px 50px;
  opacity: 0.6;
  animation: networkPulse 8s ease-in-out infinite;
  z-index: 1;
}

@keyframes networkPulse {
  0%, 100% { 
    opacity: 0.6;
    transform: scale(1);
  }
  50% { 
    opacity: 0.8;
    transform: scale(1.02);
  }
}

/* Ensure hero content is above background */
.hero > * {
  position: relative;
  z-index: 2;
}

.hero__title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--font-size-5xl);
  }
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 768px) {
  .hero__subtitle {
    font-size: var(--font-size-xl);
  }
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: var(--spacing-3xl);
}

@media (min-width: 768px) {
  .hero__actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* =============================================================================
   BUTTONS & CTAs
   ============================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: var(--font-size-base);
  line-height: 1.5;
  min-width: 140px;
}

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

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 102, 204, 0.3);
}

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

.btn--secondary:hover {
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
  transform: translateY(-2px);
}

.btn--small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-width: 100px;
}

/* =============================================================================
   CARDS & CONTENT BLOCKS
   ============================================================================= */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-4px);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

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

.cards-grid {
  display: grid;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

@media (min-width: 768px) {
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

@media (min-width: 1024px) {
  .cards-grid--three {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* =============================================================================
   TECHNOLOGY STACK
   ============================================================================= */

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-2xl);
}

.tech-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: var(--transition);
}

.tech-item:hover {
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
}

/* =============================================================================
   PROJECT TAGS
   ============================================================================= */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: var(--spacing-md) 0;
}

.tag {
  background: var(--color-accent-blue);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.tag--secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

/* =============================================================================
   FORMS
   ============================================================================= */

.form {
  max-width: 600px;
  margin: 0 auto;
}

.form__group {
  margin-bottom: var(--spacing-lg);
}

.form__label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.form__input,
.form__textarea,
.form__select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form__checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.form__checkbox {
  margin-top: 4px;
}

.form__submit {
  width: 100%;
}

@media (min-width: 768px) {
  .form__submit {
    width: auto;
  }
}

/* =============================================================================
   TOAST NOTIFICATIONS
   ============================================================================= */

.toast {
  position: fixed;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  background: var(--color-accent-teal);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  z-index: 1001;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.toast--show {
  transform: translateX(0);
}

/* =============================================================================
   FOOTER
   ============================================================================= */

.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__content {
  display: grid;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
  .footer__content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .footer__content {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__section h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.footer__section p,
.footer__section a {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.footer__section a:hover {
  color: var(--color-text-primary);
}

.footer__legal {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.footer__legal-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.footer__legal-links a {
  color: var(--color-text-muted);
}

.footer__legal-links a:hover {
  color: var(--color-text-secondary);
}

/* =============================================================================
   COOKIE NOTICE
   ============================================================================= */

.cookie-notice {
  position: fixed;
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  z-index: 1000;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.cookie-notice--show {
  transform: translateY(0);
}

@media (min-width: 768px) {
  .cookie-notice {
    left: auto;
    right: var(--spacing-xl);
    max-width: 400px;
  }
}

/* =============================================================================
   UTILITY CLASSES
   ============================================================================= */

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

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.hidden { display: none; }

.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;
}

/* =============================================================================
   RESPONSIVE SPACING
   ============================================================================= */

@media (max-width: 767px) {
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .section--hero {
    padding: var(--spacing-3xl) 0;
  }
}

/* =============================================================================
   PRINT STYLES
   ============================================================================= */

@media print {
  .header,
  .mobile-nav,
  .cookie-notice,
  .toast {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
}