/* ── Base ── */
:root {
  --sidebar-width: 220px;
  --topbar-height: 56px;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
  line-height: 1.65;
  padding-left: var(--sidebar-width);
}

/* ══════════════════════════════════════
   SIDEBAR
══════════════════════════════════════ */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  overflow: hidden;
}

html[data-theme="dark"] .sidebar {
  background: #1A1814;
  border-right-color: #38342C;
}

.sidebar__top {
  padding: var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

html[data-theme="dark"] .sidebar__top {
  border-bottom-color: #38342C;
}

.sidebar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.sidebar__logo-name {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

.logo-icon {
  display: block;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.sidebar__body {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  overflow-y: auto;
}

.sidebar__group {
  margin-bottom: var(--space-5);
}

.sidebar__group-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  padding: 0 var(--space-2);
  margin-bottom: var(--space-1);
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 7px var(--space-2);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: background 120ms ease, color 120ms ease;
  white-space: nowrap;
}

.sidebar__link:hover {
  background: var(--color-surface-2);
  color: var(--color-text-primary);
}

.sidebar__link.is-active {
  color: var(--color-macro-primary);
  background: var(--color-macro-light);
  font-weight: 600;
}

.sidebar__foot {
  padding: var(--space-3);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

html[data-theme="dark"] .sidebar__foot {
  border-top-color: #38342C;
}

.sidebar__link--search {
  flex: 1;
}

/* ══════════════════════════════════════
   TOPBAR (mobile only)
══════════════════════════════════════ */
.topbar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  z-index: 150;
}

html[data-theme="dark"] .topbar {
  background: #1A1814;
  border-bottom-color: #38342C;
}

.topbar__toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 22px;
  height: 16px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.topbar__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-secondary);
  border-radius: 1px;
  transition: transform 180ms ease, opacity 180ms ease;
}

.topbar__toggle.is-open .topbar__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.topbar__toggle.is-open .topbar__bar:nth-child(2) { opacity: 0; }
.topbar__toggle.is-open .topbar__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Topbar auth slot */
.topbar__auth { flex-shrink: 0; }
.topbar__auth-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  font-weight: 700;
  color: #fff;
  background: var(--color-macro-primary);
  border: none;
  border-radius: var(--radius-full);
  padding: 6px 14px;
  text-decoration: none;
  cursor: pointer;
  transition: opacity var(--transition-fast);
  white-space: nowrap;
}
.topbar__auth-btn:hover { opacity: 0.88; }
.topbar__auth-user {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
}
.topbar__auth-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-macro-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ══════════════════════════════════════
   SIDEBAR OVERLAY (mobile)
══════════════════════════════════════ */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 190;
}

.sidebar-overlay.is-visible { display: block; }

/* ── Theme toggle button ── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-surface-2);
  color: var(--color-text-primary);
}

/* ── Auth bar (sidebar footer) ── */
.sidebar__auth {
  padding: var(--space-2) var(--space-3) var(--space-1);
  border-top: 1px solid var(--color-border);
}
html[data-theme="dark"] .sidebar__auth { border-top-color: #38342C; }

.auth-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}
.auth-bar__email {
  font-size: 11px;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}
.auth-bar__out {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-secondary);
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 2px 10px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.auth-bar__out:hover {
  background: var(--color-surface-2);
  color: var(--color-text-primary);
}
.auth-bar__signin {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-macro-primary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.auth-bar__signin:hover { background: var(--color-macro-light); }

.auth-bar__signin-btn {
  display: block;
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 700;
  color: #fff;
  background: var(--color-macro-primary);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  margin: var(--space-2) var(--space-3);
  transition: opacity var(--transition-fast);
}
.auth-bar__signin-btn:hover { opacity: 0.88; }

/* ── Floating sign-in prompt ── */
@keyframes ap-sp-in  { from { transform: translateY(16px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes ap-sp-out { from { transform: translateY(0);    opacity: 1; } to { transform: translateY(16px); opacity: 0; } }

.ap-signin-prompt {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 9000;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-4);
  max-width: 360px;
  animation: ap-sp-in 320ms cubic-bezier(.22,.68,0,1.2) forwards;
}
.ap-signin-prompt--out { animation: ap-sp-out 280ms ease forwards; }

.ap-sp__icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--color-macro-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-macro-primary);
}
.ap-sp__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.ap-sp__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-primary);
}
.ap-sp__sub {
  font-size: 12px;
  color: var(--color-text-secondary);
  line-height: 1.45;
}
.ap-sp__btn {
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: 700;
  color: #fff;
  background: var(--color-macro-primary);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  text-decoration: none;
  white-space: nowrap;
  transition: opacity var(--transition-fast);
}
.ap-sp__btn:hover { opacity: 0.88; }
.ap-sp__close {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 13px;
  padding: 4px;
  line-height: 1;
  transition: color var(--transition-fast);
}
.ap-sp__close:hover { color: var(--color-text-primary); }

@media (max-width: 480px) {
  .ap-signin-prompt { left: var(--space-4); right: var(--space-4); bottom: var(--space-4); max-width: none; }
}

/* ══════════════════════════════════════
   PAGE CONTAINER
══════════════════════════════════════ */
.page-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-10) var(--space-6);
}

.page-container--narrow {
  max-width: 740px;
}

.page-container--wide {
  max-width: 1280px;
}

/* ══════════════════════════════════════
   HERO
══════════════════════════════════════ */
.hero {
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
  padding: 72px var(--space-6) 64px;
  position: relative;
  overflow: hidden;
}

.hero__inner {
  max-width: 1080px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero__graphic {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 580px;
  height: 580px;
  pointer-events: none;
  z-index: 0;
  opacity: 1;
}

@media (max-width: 1100px) {
  .hero__graphic { width: 420px; height: 420px; right: -60px; opacity: 0.7; }
}
@media (max-width: 768px) {
  .hero__graphic { width: 280px; height: 280px; right: -60px; top: auto; bottom: -60px; transform: none; opacity: 0.45; }
}

.hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-macro-primary);
  margin-bottom: var(--space-5);
}

.hero__kicker-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-macro-primary);
  flex-shrink: 0;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5.5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.12;
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
  letter-spacing: -0.01em;
  max-width: 680px;
}

.hero__title em {
  font-style: italic;
  color: var(--color-macro-primary);
}

.hero__subtitle {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 0 var(--space-8);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
}

/* ══════════════════════════════════════
   SECTION HEADERS
══════════════════════════════════════ */
.section-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.section-header__title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
  line-height: 1.25;
}

.section-header__subtitle {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

/* ══════════════════════════════════════
   GRID LAYOUTS
══════════════════════════════════════ */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}

/* ══════════════════════════════════════
   BREADCRUMB
══════════════════════════════════════ */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.breadcrumb__sep {
  color: var(--color-border-dark);
}

.breadcrumb__link {
  color: var(--color-macro-primary);
  transition: color var(--transition-fast);
  font-weight: 500;
  text-decoration: none;
}

.breadcrumb__link:hover {
  text-decoration: underline;
}

.breadcrumb__current {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* ══════════════════════════════════════
   CONCEPT LAYOUT
══════════════════════════════════════ */
.concept-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-8);
  align-items: start;
}

.concept-layout__main { min-width: 0; }
.concept-layout__sidebar { position: sticky; top: 20px; }

/* ══════════════════════════════════════
   PAGE TITLE
══════════════════════════════════════ */
.page-title {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
}

/* ══════════════════════════════════════
   DIVIDER
══════════════════════════════════════ */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* ══════════════════════════════════════
   SKIP LINK
══════════════════════════════════════ */
.skip-link {
  position: absolute;
  top: -999px;
  left: var(--space-4);
  z-index: 9999;
  background: var(--color-macro-primary);
  color: white;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  font-family: var(--font-sans);
}
.skip-link:focus { top: var(--space-4); }

/* ══════════════════════════════════════
   SITE FOOTER
══════════════════════════════════════ */
.site-footer {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
  margin-top: var(--space-16);
}

.site-footer__inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.site-footer__name {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.site-footer__copy {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  text-align: right;
}

.site-footer a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 1024px) {
  .concept-layout { grid-template-columns: 1fr; }
  .concept-layout__sidebar { position: static; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  body {
    padding-left: 0;
    padding-top: var(--topbar-height);
  }

  .topbar { display: flex; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 250ms ease;
  }

  .sidebar.is-open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,0.15);
  }

  .hero { padding: 52px var(--space-4) 48px; }
  .page-container { padding: var(--space-6) var(--space-4); }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .site-footer__inner { flex-direction: column; align-items: flex-start; }
  .site-footer__copy { text-align: left; }
}

@media (max-width: 480px) {
  .hero__title { font-size: var(--text-3xl); }
}