/* ========================================
   GUM Warszawa – design system
   ======================================== */

:root {
  --bg: #0a0a0b;
  --bg-2: #111113;
  --bg-3: #17171a;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.14);
  --fg: #f4f4f0;
  --fg-2: rgba(244, 244, 240, 0.72);
  --fg-3: rgba(244, 244, 240, 0.45);
  --fg-4: rgba(244, 244, 240, 0.25);
  --accent: #f4f4f0;
  --accent-2: #f4f4f0;
  --accent-ink: #0a0a0b;
  --danger: #ff6b6b;

  --font-display: "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: "DM Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --max-w: 1400px;
  --pad-x: clamp(20px, 4vw, 56px);
  --radius: 0px;
}

html[data-theme="light"] {
  --bg: #f4f4f0;
  --bg-2: #eeeee8;
  --bg-3: #e6e6e0;
  --fg: #0a0a0b;
  --fg-2: rgba(10, 10, 11, 0.72);
  --fg-3: rgba(10, 10, 11, 0.5);
  --fg-4: rgba(10, 10, 11, 0.25);
  --line: rgba(0, 0, 0, 0.1);
  --line-2: rgba(0, 0, 0, 0.18);
  --accent: #0a0a0b;
  --accent-2: #0a0a0b;
  --accent-ink: #f4f4f0;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  overflow-x: hidden;
}

/* Subtle poster-like grid background */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 80px 80px;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

html[data-theme="light"] body::before {
  background-image:
    linear-gradient(to right, rgba(0, 0, 0, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.04) 1px, transparent 1px);
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

/* ============== Typography ============== */

.display {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 0.95;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}

/* ============== Layout helpers ============== */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  position: relative;
  z-index: 1;
}

section {
  position: relative;
  z-index: 1;
}

/* ============== Buttons ============== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: 0;
  transition: all 0.15s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--fg);
  background: rgba(255, 255, 255, 0.04);
}

html[data-theme="light"] .btn:hover {
  background: rgba(0, 0, 0, 0.04);
}

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

.btn--primary:hover {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--accent-ink);
  transform: translate(-1px, -1px);
  box-shadow: 2px 2px 0 var(--fg-3);
}

.btn--ghost {
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}

.btn--ghost:hover {
  background: transparent;
  border-color: transparent;
  color: var(--accent);
}

.btn .arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}

.btn:hover .arrow {
  transform: translateX(3px);
}

/* ============== Animations ============== */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============== Scroll anchors ============== */

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 80px;
}