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

html,
body {
  height: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  background:
    radial-gradient(ellipse 1200px 600px at 50% -10%, var(--color-glow), transparent),
    linear-gradient(var(--color-grid-line) 1px, transparent 1px) 0 0 / 100% 64px,
    var(--color-bg);
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--duration-base) var(--ease-out),
    color var(--duration-base) var(--ease-out);
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Firefox */
* {
  scrollbar-color: var(--color-border-strong) transparent;
  scrollbar-width: thin;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg);
}

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

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

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

button {
  font: inherit;
  color: inherit;
}

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

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (max-width: 640px) {
  .container {
    padding-inline: var(--space-4);
  }
}

.site-main {
  min-height: calc(100vh - var(--header-height));
  padding-block: var(--space-6);
}

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--color-bg-elevated) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), #1d4ed8 60%, #172554);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.primary-nav a {
  position: relative;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.primary-nav a::after {
  content: "";
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: 2px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--duration-base) var(--ease-out);
}

.primary-nav a:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.primary-nav a.is-active {
  color: var(--color-text);
  background: var(--color-surface-hover);
}

.primary-nav a.is-active::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.icon-button:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-strong);
}

.icon-button:active {
  transform: scale(0.94);
}

.icon-button svg {
  width: 18px;
  height: 18px;
}

.nav-toggle {
  display: none;
}

/* Mobile slide-out drawer */
.mobile-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 14, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
  z-index: 49;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(84vw, 340px);
  background: var(--color-bg-elevated);
  border-left: 1px solid var(--color-border);
  z-index: 50;
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  display: flex;
  flex-direction: column;
  padding: var(--space-5);
}

body.drawer-open .mobile-drawer {
  transform: translateX(0);
}

body.drawer-open .mobile-drawer-backdrop {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.mobile-drawer nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.mobile-drawer-section {
  margin: var(--space-4) var(--space-3) var(--space-1);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
}

.mobile-drawer nav > .mobile-drawer-section:first-child {
  margin-top: 0;
}

.mobile-drawer a {
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mobile-drawer a svg {
  flex-shrink: 0;
  color: var(--color-text-faint);
  transition: color var(--duration-fast) var(--ease-out);
}

.mobile-drawer a:active,
.mobile-drawer a:hover {
  background: var(--color-surface-hover);
}

.mobile-drawer a.is-active {
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  color: var(--color-accent);
}

.mobile-drawer a.is-active svg {
  color: var(--color-accent);
}

@media (max-width: 860px) {
  .primary-nav {
    display: none;
  }

  .nav-toggle {
    display: grid;
  }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-6);
  color: var(--color-text-muted);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* Flash messages */
.flash-stack {
  position: fixed;
  top: calc(var(--header-height) + var(--space-4));
  right: var(--space-4);
  left: var(--space-4);
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  pointer-events: none;
}

.flash {
  pointer-events: auto;
  max-width: 420px;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-md);
  font-size: 0.9rem;
  animation: flash-in var(--duration-slow) var(--ease-out);
}

.flash.success {
  border-left: 3px solid var(--color-success);
}

.flash.error {
  border-left: 3px solid var(--color-danger);
}

.flash.warning {
  border-left: 3px solid var(--color-warning);
}

.flash.info {
  border-left: 3px solid var(--color-info);
}

@keyframes flash-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .flash-stack {
    align-items: stretch;
  }
}