/* ============================================================
   css/layout.css — URHIDU Documentation
   Header, Sidebar, Layout, Footer
   ============================================================ */

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 100%;
  padding: 0 var(--space-6);
  max-width: 100%;
}

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--color-surface);
}

.hamburger-line {
  display: block;
  width: 18px;
  height: 1.8px;
  background: var(--color-dark);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base);
}

/* Header brand */
.header-brand {
  flex-shrink: 0;
}

.header-logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: opacity var(--transition-fast);
}

.header-logo-link:hover {
  opacity: 0.8;
}

.header-logo-svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.header-brand-name {
  font-family: var(--font-primary);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  color: var(--color-dark);
  letter-spacing: -0.01em;
}

.header-brand-suffix {
  font-weight: var(--weight-light);
  color: var(--color-text-muted);
}

/* Search */
.header-search-wrap {
  flex: 1;
  max-width: 480px;
  margin: 0 var(--space-4);
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
  flex-shrink: 0;
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 38px;
  padding: 0 var(--space-10) 0 var(--space-9);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-input:focus {
  background: var(--color-white);
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(255,215,0,0.15);
}

.search-kbd {
  position: absolute;
  right: var(--space-3);
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--color-text-muted);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  pointer-events: none;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
  flex-shrink: 0;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-primary);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-sm {
  height: 34px;
  padding: 0 var(--space-4);
  font-size: var(--text-sm);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-surface);
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-dark);
  border: 1px solid var(--color-gold);
  font-weight: var(--weight-semibold);
}

.btn-gold:hover {
  background: var(--color-gold-dark);
  border-color: var(--color-gold-dark);
  box-shadow: var(--shadow-gold);
}

/* ============================================================
   LAYOUT WRAPPER
   ============================================================ */

.layout-wrapper {
  display: flex;
  padding-top: var(--header-height);
  min-height: 100vh;
  position: relative;
}

/* ============================================================
   SIDEBAR
   ============================================================ */

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-white);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  z-index: 50;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
  transition: transform var(--transition-slow);
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

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

.sidebar::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  padding: var(--space-6) 0 var(--space-8);
  min-height: 100%;
}

.sidebar-logo-wrap {
  padding: 0 var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-5);
}

.sidebar-logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: opacity var(--transition-fast);
}

.sidebar-logo-link:hover {
  opacity: 0.8;
}

.sidebar-logo-svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.sidebar-brand-text {
  display: flex;
  flex-direction: column;
}

.sidebar-brand-name {
  font-family: var(--font-primary);
  font-weight: var(--weight-bold);
  font-size: var(--text-base);
  color: var(--color-dark);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.sidebar-brand-sub {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: var(--weight-regular);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.sidebar-version-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 var(--space-5) var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  width: fit-content;
}

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

/* Sidebar Nav */
.sidebar-nav {
  flex: 1;
  padding: 0 var(--space-3);
}

.nav-group {
  margin-bottom: var(--space-6);
}

.nav-group-label {
  display: block;
  font-family: var(--font-primary);
  font-size: 10px;
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  padding: 0 var(--space-3) var(--space-2);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-regular);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
  cursor: pointer;
  width: 100%;
  text-align: left;
  line-height: 1.4;
}

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

.nav-link--active {
  background: var(--color-gold-light);
  color: var(--color-dark);
  font-weight: var(--weight-medium);
}

.nav-link--active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--color-gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.nav-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: inherit;
}

.nav-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 18px;
  font-family: var(--font-primary);
  font-size: 10px;
  font-weight: var(--weight-semibold);
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  letter-spacing: 0;
}

/* Sub-nav */
.nav-sub-list {
  display: none;
  flex-direction: column;
  padding-left: var(--space-6);
  padding-top: var(--space-1);
  padding-bottom: var(--space-1);
  gap: 0;
}

.nav-item--expanded .nav-sub-list {
  display: flex;
}

.nav-sub-link {
  display: block;
  padding: 5px var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--color-border);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
  line-height: 1.5;
}

.nav-sub-link:hover {
  color: var(--color-text-primary);
  border-color: var(--color-gold);
  background: var(--color-surface);
}

/* Sidebar footer */
.sidebar-footer {
  padding: var(--space-5) var(--space-5) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-6);
}

.sidebar-footer-link {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.sidebar-footer-link:hover {
  color: var(--color-gold-dark);
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 40;
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.sidebar-overlay.overlay--visible {
  display: block;
  opacity: 1;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-width: 0;
}

.content-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-10) var(--space-8) var(--space-16);
}

/* Breadcrumb */
.breadcrumb {
  margin-bottom: var(--space-6);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.breadcrumb-item {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.breadcrumb-link {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-gold-dark);
}

.breadcrumb-sep {
  color: var(--color-border-strong);
  font-size: var(--text-sm);
}

.breadcrumb-item--current {
  color: var(--color-text-secondary);
  font-weight: var(--weight-medium);
}

/* Article header */
.article-header {
  margin-bottom: var(--space-10);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.article-tag {
  display: inline-block;
  font-family: var(--font-primary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-dark);
  background: var(--color-gold);
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
}

.article-read-time {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.article-divider {
  height: 1px;
  background: linear-gradient(to right, var(--color-gold), transparent);
  margin-top: var(--space-6);
}

/* Article navigation */
.article-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: var(--space-4);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.article-nav-placeholder {
  flex: 1;
}

.article-nav-prev,
.article-nav-next {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 260px;
  flex: 1;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.article-nav-prev {
  text-align: left;
}

.article-nav-next {
  text-align: right;
  margin-left: auto;
}

.article-nav-prev:hover,
.article-nav-next:hover {
  border-color: var(--color-gold);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.article-nav-label {
  font-family: var(--font-primary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.article-nav-title {
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

/* Content sections */
.content-section {
  margin-bottom: var(--space-10);
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  background: var(--color-dark-soft);
  color: var(--color-text-inverse);
  margin-left: var(--sidebar-width);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-12) var(--space-8);
  display: flex;
  justify-content: space-between;
  gap: var(--space-10);
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  max-width: 280px;
}

.footer-logo {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.footer-company {
  font-family: var(--font-primary);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  color: var(--color-white);
  margin-bottom: var(--space-1);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  line-height: 1.5;
}

.footer-links-grid {
  display: flex;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.footer-col-title {
  font-family: var(--font-primary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  margin-bottom: var(--space-4);
}

.footer-link-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-link {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-white);
}

.footer-address {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-address p {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
}

.footer-bottom {
  background: rgba(0,0,0,0.2);
  padding: var(--space-4) var(--space-8);
  margin-left: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.footer-copy,
.footer-meta {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}