:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #1e3a8a;
  --color-primary-light: #60a5fa;
  --color-secondary: #1e293b;
  --color-accent: #10b981;
  --color-bg: #0f172a;
  --color-surface: rgba(30, 41, 59, 0.6);
  --color-surface-alt: rgba(15, 23, 42, 0.7);
  --color-text: #f8fafc;
  --color-text-light: #94a3b8;
  --color-text-inverse: #0f172a;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-success: #10b981;
  --color-error: #ef4444;

  --font-heading: 'Inter', sans-serif;
  --font-body: 'Roboto', sans-serif;

  --text-xs: clamp(0.75rem, 0.7vw + 0.5rem, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8vw + 0.5rem, 1rem);
  --text-base: clamp(1.125rem, 1.2vw + 0.5rem, 1.25rem);
  --text-lg: clamp(1.25rem, 1.5vw + 0.5rem, 1.5rem);
  --text-xl: clamp(1.5rem, 1.8vw + 0.5rem, 1.75rem);
  --text-2xl: clamp(1.75rem, 2.5vw + 0.5rem, 2.5rem);
  --text-3xl: clamp(2.5rem, 3.5vw + 0.5rem, 3.5rem);
  --text-4xl: clamp(3rem, 5vw + 0.5rem, 5.5rem);

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.5);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle at top right, rgba(30,58,138,0.2) 0%, transparent 40%),
                    radial-gradient(circle at bottom left, rgba(16,185,129,0.1) 0%, transparent 40%);
  line-height: 1.7;
  opacity: 0;
  transition: opacity 400ms ease;
  min-height: 100vh;
  padding-right: 260px;
}

body.loaded {
  opacity: 1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: #ffffff;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  background: linear-gradient(to right, #60a5fa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

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

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

/* Header */
header {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 260px;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-left: 1px solid var(--color-border);
  z-index: 100;
  transition: padding var(--transition-normal);
  padding: var(--space-xl) 0;
  overflow-y: auto;
}

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

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.header-inner {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  gap: var(--space-xl);
  height: 100%;
  padding: 0 var(--space-md);
}

.logo svg {
  height: 48px;
  width: auto;
}

nav {
  flex-grow: 1;
  width: 100%;
}

nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: var(--space-md);
  align-items: flex-start;
  width: 100%;
}

nav a {
  font-weight: 500;
  position: relative;
  padding: 8px 0;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

nav a:hover {
  color: var(--color-text);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
  transition: width var(--transition-normal);
}

nav a:not(.btn):hover::after {
  width: 100%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  letter-spacing: 0.5px;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.8);
}

.btn-primary::after { display: none !important; }

.btn-secondary {
  background-color: transparent;
  color: var(--color-text) !important;
  border: 1px solid var(--color-border);
  backdrop-filter: blur(4px);
}

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

.lang-selector {
  position: relative;
  cursor: pointer;
  color: var(--color-text);
  font-weight: 600;
}

.lang-current {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  background: var(--color-surface-alt);
  backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  overflow: hidden;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  min-width: 150px;
}

.lang-selector:hover .lang-dropdown {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.lang-dropdown a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  white-space: nowrap;
  border-bottom: 1px solid var(--color-border);
}

.lang-dropdown a:last-child {
  border-bottom: none;
}

.lang-dropdown a:hover {
  background: var(--color-primary-dark);
  color: white;
}

/* Animations */
.reveal-up { opacity: 0; transform: translateY(40px); transition: all 800ms cubic-bezier(0.16, 1, 0.3, 1); }
.reveal-left { opacity: 0; transform: translateX(-40px); transition: all 800ms cubic-bezier(0.16, 1, 0.3, 1); }
.reveal-right { opacity: 0; transform: translateX(40px); transition: all 800ms cubic-bezier(0.16, 1, 0.3, 1); }
.reveal-scale { opacity: 0; transform: scale(0.9); transition: all 800ms cubic-bezier(0.16, 1, 0.3, 1); }
.is-visible { opacity: 1; transform: none; }

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hamburger {
  display: none;
  cursor: pointer;
  flex-direction: column;
  gap: 6px;
  z-index: 101;
}

.hamburger span {
  display: block;
  width: 30px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition-normal);
}

.hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

@media (max-width: 1024px) {
  body { padding-right: 0; }
  header {
    top: 0; right: 0; left: 0; bottom: auto;
    width: 100%; height: auto;
    border-left: none;
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-sm) 0;
    overflow-y: visible;
  }
  .header-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  .hamburger { display: flex; }
  nav ul {
    position: fixed;
    top: 0;
    right: -100%;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    width: 100%;
    height: 100vh;
    transition: right var(--transition-normal);
    padding: var(--space-xl);
    z-index: 100;
  }
  nav ul.active { right: 0; }
  nav ul li { width: 100%; text-align: center; }
  nav a { font-size: var(--text-2xl); }
}

/* Footer */
footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-light);
  padding: var(--space-2xl) 0 var(--space-md);
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-col h4 {
  color: var(--color-text);
  margin-bottom: var(--space-md);
  font-size: var(--text-lg);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  font-size: var(--text-sm);
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(30, 41, 59, 0.9);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border);
  padding: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

.cookie-banner.show { transform: translateY(0); }
.cookie-buttons { display: flex; gap: var(--space-sm); }

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 50px;
  height: 50px;
  background: rgba(59, 130, 246, 0.2);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(59, 130, 246, 0.5);
  color: var(--color-text);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 99;
}

.back-to-top:hover {
  background: var(--color-primary);
  transform: translateY(-5px);
}

.back-to-top.show { opacity: 1; visibility: visible; }

/* Main content spacing */
main { margin-top: 100px; }
section { padding: var(--space-3xl) 0; }

/* Common Components */
.section-title { text-align: center; margin-bottom: var(--space-3xl); }
.section-title p { color: var(--color-primary-light); text-transform: uppercase; letter-spacing: 2px; font-weight: 600; font-size: var(--text-sm); margin-bottom: 8px;}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.card {
  background: var(--color-surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(255,255,255,0.2);
}

.card:hover::before { transform: scaleX(1); }

.icon-placeholder {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-lg);
  stroke: var(--color-primary-light);
  fill: none;
  stroke-width: 1.5;
}

/* Forms */
.form-group { position: relative; margin-bottom: var(--space-lg); }

.form-control {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  color: white;
  outline: none;
  font-family: inherit;
  transition: border-color 0.3s;
}

.form-control:focus { border-color: var(--color-primary-light); }

.form-label {
  position: absolute;
  left: var(--space-md);
  top: var(--space-md);
  color: var(--color-text-light);
  transition: all var(--transition-fast);
  pointer-events: none;
}

.form-control:focus ~ .form-label,
.form-control:not(:placeholder-shown) ~ .form-label {
  top: -10px;
  left: 10px;
  font-size: var(--text-xs);
  background: var(--color-bg);
  padding: 0 8px;
  color: var(--color-primary-light);
  border-radius: 4px;
}

/* Accordion */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  background: var(--color-surface);
  overflow: hidden;
}

.accordion-header {
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: var(--text-lg);
}

.accordion-icon { transition: transform var(--transition-normal); }
.accordion.active .accordion-icon { transform: rotate(45deg); color: var(--color-primary-light); }

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.accordion-content-inner {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-light);
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}