:root {
  /* Colors */
  --color-bg: #111213;
  --color-fg: #f4f2ed;
  --color-accent: #ff6a1a;
  --color-accent-hover: #ff8444;
  --color-neutral-muted: #191a1b;
  --color-neutral-light: #e9e7e1;
  --color-border: rgba(255, 255, 255, 0.15);
  --color-selection: #ff6a1a;

  /* Typography */
  --font-family: "Inter", sans-serif;
  
  --font-size-display: 8rem;
  --font-weight-display: 500;
  --line-height-display: 0.92;
  --letter-spacing-display: -0.05em;

  --font-size-heading: 4rem;
  --font-weight-heading: 500;
  --line-height-heading: 1.1;
  --letter-spacing-heading: -0.025em;

  --font-size-body: 1.125rem;
  --font-weight-body: 400;
  --line-height-body: 1.6;

  --font-size-ui: 0.875rem;
  --font-weight-ui: 500;
  --letter-spacing-ui: 0.01em;

  /* Spacing */
  --spacing-base: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --spacing-xl: 112px;

  /* Rounded */
  --radius-sm: 2px;
  --radius-md: 6px;
  --radius-lg: 12px;
  --radius-full: 999px;

  /* Motion */
  --motion-curve: cubic-bezier(.22,.61,.36,1);
  --motion-duration: 560ms;
  --motion-stagger: 105ms;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-body);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background-color: var(--color-selection);
  color: #fff;
}

/* Typography */
.display-text {
  font-size: clamp(4rem, 8vw, var(--font-size-display));
  font-weight: var(--font-weight-display);
  line-height: var(--line-height-display);
  letter-spacing: var(--letter-spacing-display);
}

.heading-text {
  font-size: clamp(2.5rem, 5vw, var(--font-size-heading));
  font-weight: var(--font-weight-heading);
  line-height: var(--line-height-heading);
  letter-spacing: var(--letter-spacing-heading);
}

.ui-text {
  font-size: var(--font-size-ui);
  font-weight: var(--font-weight-ui);
  letter-spacing: var(--letter-spacing-ui);
}

/* Layout */
.container {
  max-width: 1536px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-light {
  background-color: var(--color-neutral-light);
  color: var(--color-bg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-ui);
  font-weight: var(--font-weight-ui);
  letter-spacing: var(--letter-spacing-ui);
  cursor: pointer;
  transition: all var(--motion-duration) var(--motion-curve);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #000;
}

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

.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: #fff;
}

.btn-secondary:hover {
  border-color: #fff;
  background-color: rgba(255, 255, 255, 0.05);
}

/* Cards */
.card-service {
  background-color: var(--color-neutral-muted);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  transition: transform var(--motion-duration) var(--motion-curve);
}

.card-work {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.card-work img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--motion-duration) var(--motion-curve);
}

.card-work:hover img {
  transform: scale(1.03);
}

.card-work .label {
  position: absolute;
  bottom: var(--spacing-sm);
  left: var(--spacing-sm);
  opacity: 0;
  transition: opacity var(--motion-duration) var(--motion-curve);
  background: var(--color-bg);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.card-work:hover .label {
  opacity: 1;
}

/* Nav */
.nav-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background-color: rgba(17, 18, 19, 0.9);
  backdrop-filter: blur(12px);
  z-index: 50;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.3s ease;
}

.nav-top a {
  color: var(--color-fg);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity var(--motion-duration) var(--motion-curve);
}

.nav-top a:hover {
  opacity: 1;
}

/* Accordion */
.accordion-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: var(--font-size-heading);
  transition: color var(--motion-duration) var(--motion-curve);
}

.accordion-item.active .number {
  color: var(--color-accent);
}

.accordion-content {
  display: none;
  padding-top: var(--spacing-sm);
  color: var(--color-fg);
  opacity: 0.8;
  font-size: var(--font-size-body);
}

.accordion-item.active .accordion-content {
  display: block;
}

/* Helpers */
.mb-xs { margin-bottom: var(--spacing-xs); }
.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); }