/* ==========================================================================
   SLEEVE DESIGN SYSTEM — RESET, BASE TYPOGRAPHY & SHELL LAYOUT
   ========================================================================== */

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

html {
  font-size: 16px;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
}

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

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

button {
  cursor: pointer;
}

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

ul,
ol {
  list-style: none;
}

/* Focus Accessibility */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: 999;
  padding: var(--space-2) var(--space-4);
  background: var(--accent-primary);
  color: var(--text-on-accent);
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: var(--space-3);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-pill);
}

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

/* Layout Primitives */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

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

.main-content {
  flex: 1;
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* Editorial Header Bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-1) 0;
}

.brand-emblem {
  position: relative;
  width: 34px;
  height: 30px;
  display: inline-flex;
  align-items: center;
}

.brand-sleeve-box {
  position: relative;
  z-index: 2;
  width: 22px;
  height: 26px;
  background: var(--bg-surface);
  border: 1.75px solid var(--text-primary);
  border-radius: 3px;
  box-shadow: 2px 0 6px rgba(0, 0, 0, 0.5);
}

.brand-sleeve-box::after {
  content: '';
  position: absolute;
  top: 5px;
  left: 4px;
  width: 10px;
  height: 2px;
  background: var(--accent-primary);
}

.brand-vinyl-disc {
  position: absolute;
  right: 0;
  z-index: 1;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at center, var(--accent-primary) 0 22%, #141418 24% 100%);
  border: 1.5px solid var(--accent-primary);
  transition: transform var(--duration-normal) var(--ease-out);
}

.brand-lockup:hover .brand-vinyl-disc {
  transform: translateX(3px) rotate(25deg);
}

.brand-text-group {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Primary Navigation */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--bg-surface);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.nav-tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  border-radius: var(--radius-xs);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-tab:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.nav-tab.is-active {
  color: var(--text-on-accent);
  background: var(--accent-primary);
}

.nav-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* API Status Pill */
.header-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.api-status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 5px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-dot--live {
  background: var(--tier-masterpiece);
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.55);
}

.status-dot--fallback {
  background: var(--accent-primary);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding-block: var(--space-8);
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.footer-meta-col {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--accent-primary);
  background: var(--accent-primary-soft);
  border: 1px solid var(--border-accent);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
}

.footer-shortcut-hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-primary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xs);
}

@media (max-width: 720px) {
  .api-status-pill .status-text {
    display: none;
  }
  .footer-shortcut-hint {
    display: none;
  }
}

/* === PHASE 10B: RESPONSIVE HEADER, NAVIGATION & REDUCED MOTION === */
@media (max-width: 1024px) {
  .header-inner {
    height: auto;
    min-height: 64px;
    padding-block: var(--space-2);
    flex-wrap: wrap;
    row-gap: var(--space-2);
  }

  .brand-lockup {
    order: 1;
  }

  .header-meta {
    order: 2;
    margin-left: auto;
  }

  .primary-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    justify-content: flex-start;
  }

  .nav-tab {
    flex-shrink: 0;
    min-height: 36px;
    white-space: nowrap;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding-top: var(--space-5);
    padding-bottom: var(--space-12);
  }

  .nav-tab {
    padding: 6px 11px;
    font-size: var(--text-xs);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}