/* ============================================
   GerSite — Global Design System
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

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-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--color-orange-300);
}

ul, ol {
  list-style: none;
}

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

button {
  cursor: pointer;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* ---------- Custom Properties ---------- */
:root {
  /* Colors — Dark Theme */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-card: #141414;
  --color-bg-card-hover: #1c1c1c;
  --color-bg-elevated: #1e1e1e;
  --color-bg-input: #0f0f0f;
  --color-bg-overlay: rgba(0, 0, 0, 0.7);

  /* Brand Colors */
  --color-orange-300: #fdba74;
  --color-orange-400: #fb923c;
  --color-orange-500: #f97316;
  --color-orange-600: #ea580c;
  --color-orange-700: #c2410c;
  --color-amber-400: #fbbf24;
  --color-amber-500: #f59e0b;
  --color-green-400: #4ade80;
  --color-green-500: #22c55e;
  --color-red-400: #f87171;
  --color-red-500: #ef4444;
  --color-blue-400: #60a5fa;
  --color-blue-500: #3b82f6;

  /* Text Colors */
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a3a3a3;
  --color-text-muted: #737373;
  --color-text-accent: var(--color-orange-400);
  --color-text-inverse: #0a0a0a;

  /* Borders */
  --color-border: #262626;
  --color-border-hover: #404040;
  --color-border-accent: var(--color-orange-500);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-orange-600), var(--color-orange-400));
  --gradient-primary-hover: linear-gradient(135deg, var(--color-orange-500), var(--color-orange-300));
  --gradient-hero: radial-gradient(ellipse at 50% 0%, rgba(249, 115, 22, 0.12) 0%, transparent 60%);
  --gradient-card: linear-gradient(180deg, rgba(249, 115, 22, 0.05) 0%, transparent 40%);
  --gradient-text: linear-gradient(135deg, var(--color-orange-400), var(--color-amber-400));

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --font-size-2xs: 0.625rem;    /* 10px */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */
  --font-size-7xl: 4.5rem;      /* 72px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.1;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.05em;
  --letter-spacing-wider: 0.1em;
  --letter-spacing-mono: 0.15em;

  /* Spacing Scale */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-14: 3.5rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);
  --shadow-glow-sm: 0 0 20px rgba(249, 115, 22, 0.1);
  --shadow-glow: 0 0 40px rgba(249, 115, 22, 0.15);
  --shadow-glow-lg: 0 0 80px rgba(249, 115, 22, 0.2);
  --shadow-glow-strong: 0 0 60px rgba(249, 115, 22, 0.3);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-chat: 600;
  --z-cookie: 700;

  /* Layout */
  --container-max: 1280px;
  --container-narrow: 960px;
  --container-tight: 720px;
  --navbar-height: 72px;
  --section-padding: var(--space-24);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
}

h2 {
  font-size: var(--font-size-4xl);
}

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);
  font-weight: var(--font-weight-semibold);
}

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

strong, b {
  font-weight: var(--font-weight-semibold);
}

small {
  font-size: var(--font-size-sm);
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--tight {
  max-width: var(--container-tight);
}

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

.section--alt {
  background-color: var(--color-bg-secondary);
}

.section--dark {
  background-color: var(--color-bg-tertiary);
}

/* ---------- Flexbox Helpers ---------- */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

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

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

.justify-center {
  justify-content: center;
}

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

.justify-end {
  justify-content: flex-end;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

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

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

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

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

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Text Utilities ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-text-accent); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

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

.text-mono {
  font-family: var(--font-mono);
  letter-spacing: var(--letter-spacing-mono);
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
}

/* ---------- Spacing Utilities ---------- */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.mx-auto { margin-left: auto; margin-right: auto; }

/* ---------- Display Utilities ---------- */
.hidden { display: none !important; }
.block { display: block; }
.inline-block { display: inline-block; }
.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;
}

/* ---------- Scroll Animation Classes ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.animate-on-scroll.delay-1 {
  transition-delay: 100ms;
}

.animate-on-scroll.delay-2 {
  transition-delay: 200ms;
}

.animate-on-scroll.delay-3 {
  transition-delay: 300ms;
}

.animate-on-scroll.delay-4 {
  transition-delay: 400ms;
}

.animate-on-scroll.from-left {
  transform: translateX(-30px);
}

.animate-on-scroll.from-left.is-visible {
  transform: translateX(0);
}

.animate-on-scroll.from-right {
  transform: translateX(30px);
}

.animate-on-scroll.from-right.is-visible {
  transform: translateX(0);
}

.animate-on-scroll.scale-in {
  transform: scale(0.95);
}

.animate-on-scroll.scale-in.is-visible {
  transform: scale(1);
}

/* ---------- Keyframe Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

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

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

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(249, 115, 22, 0.1); }
  50% { box-shadow: 0 0 40px rgba(249, 115, 22, 0.25); }
}

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

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes count-up {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ---------- Responsive Base ---------- */
@media (max-width: 1024px) {
  :root {
    --section-padding: var(--space-16);
  }
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
}

@media (max-width: 768px) {
  :root {
    --section-padding: var(--space-12);
    --navbar-height: 64px;
  }
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }

  .container {
    padding: 0 var(--space-4);
  }
}

@media (max-width: 480px) {
  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }
}

/* ---------- Selection ---------- */
::selection {
  background: rgba(249, 115, 22, 0.3);
  color: var(--color-text-primary);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* ---------- Focus Visible ---------- */
:focus-visible {
  outline: 2px solid var(--color-orange-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}