/* 
  DS Prod OÜ - Premium Dark Theme Design System 
  CSS Custom Properties & Normalize
*/

:root {
  /* Colors */
  --color-bg: #0a0b10;
  --color-bg-alt: #0f1117;
  --color-surface: #151720;
  --color-surface-hover: #1c1f2e;
  --color-surface-active: #232638;
  --color-border: #262938;
  --color-border-light: #1e2130;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: rgba(59, 130, 246, 0.1);
  --color-secondary: #8b5cf6;
  --color-accent: #22d3a7;
  --color-text: #f1f3f9;
  --color-text-secondary: #8b92a5;
  --color-text-muted: #5c6378;
  
  --color-success: #22c55e;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  
  --color-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --color-gradient-hover: linear-gradient(135deg, #2563eb, #7c3aed);
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* 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;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.5);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Normalize */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-normal);
}

ul, ol {
  list-style: none;
}

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

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: clamp(3rem, 5.5vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: clamp(2.5rem, 4.5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  line-height: clamp(2rem, 3.5vw, 2.25rem);
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  line-height: 1.75rem;
  font-weight: 600;
}

p {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-4);
}

.text-small {
  font-size: 0.875rem;
}

.text-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.gradient-text {
  background: var(--color-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

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

@media (min-width: 992px) {
  .section {
    padding: var(--spacing-24) 0;
  }
}

.hero {
  padding: 8rem 0 6rem;
  position: relative;
  overflow: hidden;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-6);
}

.grid-cols-2 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(1, 1fr); }

@media (min-width: 768px) {
  .grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 992px) {
  .grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Components */
/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  gap: var(--spacing-2);
}

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

.btn-primary {
  background: var(--color-gradient);
  color: #fff !important;
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
  background: var(--color-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.23);
  color: #fff !important;
}

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

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

.btn-outline-primary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-lg);
}

/* Badges */
.badge {
  display: inline-block;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: var(--color-primary-light);
  color: #60a5fa !important;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-secondary {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-secondary);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.badge-accent {
  background: rgba(34, 211, 167, 0.1);
  color: var(--color-accent);
  border: 1px solid rgba(34, 211, 167, 0.2);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(10, 11, 16, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--spacing-8);
}

@media (min-width: 992px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-secondary);
}

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

.nav-actions {
  display: none;
  align-items: center;
  gap: var(--spacing-4);
}

@media (min-width: 992px) {
  .nav-actions {
    display: flex;
  }
}

.mobile-menu-btn {
  display: block;
  font-size: 1.5rem;
  color: var(--color-text);
  cursor: pointer;
}

@media (min-width: 992px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  height: 100vh;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  z-index: 1000;
  padding: var(--spacing-8) var(--spacing-6);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-normal);
}

.mobile-menu.open {
  right: 0;
}

.mobile-menu-close {
  align-self: flex-end;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  margin-bottom: var(--spacing-8);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
}

.mobile-nav-link {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

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

/* Footer */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-top {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-10);
  margin-bottom: var(--spacing-12);
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .footer-top {
    grid-template-columns: 2fr repeat(3, 1fr);
  }
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-4);
  color: var(--color-text);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.footer-link {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

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

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

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-2);
  color: var(--color-text);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--transition-normal);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

textarea.form-control {
  resize: vertical;
}

/* Toast System */
.toast-container {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.toast {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
  width: 300px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  transform: translateX(120%);
  transition: transform var(--transition-normal);
}

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

/* Animations */
.animate-on-scroll {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up { animation: fadeInUp 0.6s ease-out forwards; }
.fade-in-left { animation: fadeInLeft 0.6s ease-out forwards; }
.fade-in-right { animation: fadeInRight 0.6s ease-out forwards; }

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

@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

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

/* Contrast Enhancements to prevent blue-on-blue text */
.text-primary {
  color: #60a5fa !important;
}

.bg-primary {
  background-color: #2563eb !important;
  color: #ffffff !important;
}

.bg-primary h1, .bg-primary h2, .bg-primary h3, .bg-primary h4, .bg-primary p, .bg-primary span {
  color: #ffffff !important;
}

.badge.bg-primary {
  background-color: rgba(37, 99, 235, 0.3) !important;
  color: #ffffff !important;
  border: 1px solid rgba(59, 130, 246, 0.4) !important;
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2.2rem;
  right: 2.2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

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

.back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.65);
  color: #ffffff !important;
}

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