/* ================================
   DESIGN TOKENS
================================ */

:root {
  --color-bg-dark: #07090d;
  --color-bg-dark-soft: #0d1118;
  --color-surface-dark: rgba(16, 21, 31, 0.82);
  --color-surface-dark-2: rgba(19, 24, 35, 0.92);
  --color-surface-light: #f3f4f7;
  --color-border-soft: rgba(255, 255, 255, 0.09);
  --color-border-strong: rgba(255, 255, 255, 0.16);
  --color-text-primary: #ffffff;
  --color-text-secondary: #b7bfcc;
  --color-text-dark: #111318;
  --color-button-light: #f4f6f8;
  --color-button-text: #101217;
  --color-button-dark: rgba(255, 255, 255, 0.04);
  --color-button-dark-text: #f7f8fb;
  --color-accent: #d9dde6;

  --font-family-base: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: clamp(1.85rem, 4vw, 2.8rem);
  --font-size-xxl: clamp(2.7rem, 7vw, 5.5rem);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --site-header-height: 84px;

  --container-width: 1240px;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --shadow-soft: 0 18px 60px rgba(0, 0, 0, 0.28);
  --shadow-card: 0 20px 50px rgba(0, 0, 0, 0.24);
}

* , *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow-x: hidden;
}

body { max-width: 100%; }
body {
  padding-top: var(--site-header-height);
}

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

body {
  font-family: var(--font-family-base);
  background:
    radial-gradient(circle at top, rgba(96, 114, 145, 0.14), transparent 32%),
    linear-gradient(180deg, #080a0e, #050609 70%);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

p, a, li, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: anywhere;
  word-break: break-word;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin: 0;
}

p {
  margin: 0;
  color: inherit;
}

a {
  color: inherit;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 48px;
  padding: 0.9rem 1.4rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform 0.22s ease, opacity 0.22s ease, background 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-light {
  background: linear-gradient(180deg, #ffffff, #e8edf4);
  color: var(--color-button-text);
  box-shadow: 0 10px 24px rgba(255, 255, 255, 0.12);
}

.btn-light:hover {
  opacity: 0.98;
  box-shadow: 0 14px 28px rgba(255, 255, 255, 0.16);
}

.btn-ghost {
  background: var(--color-button-dark);
  color: var(--color-button-dark-text);
  border-color: var(--color-border-soft);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  border-color: var(--color-border-strong);
  background: rgba(255, 255, 255, 0.07);
}

@media (max-width: 768px) {
  .container { padding-inline: 1rem; }
  .btn { width: 100%; }
}

/* Shared sticky navbar for all OBSIDIAN pages */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  width: 100%;
}