/* Codex Artificialis — Layout */

/* ===== TOP BAR ===== */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-header);
  transition: background var(--transition-base);
}

.top-bar__left {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 var(--space-md);
  min-width: 0;
}

.top-bar__subtitle {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-top: -2px;
  order: 3;
}

.top-bar__subtitle-short {
  display: none;
}

.top-bar__title {
  font-family: var(--font-display);
  font-size: clamp(0.9rem, 2vw, 1.3rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.top-bar__back {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.top-bar__back:hover {
  color: var(--gold);
}

.top-bar__stats {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  min-width: 0;
  flex-shrink: 1;
}

.stat {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}

.stat__label {
  color: var(--text-muted);
  margin-right: var(--space-xs);
}

.stat__value {
  color: var(--text-primary);
}

.stat--essence .stat__value {
  color: var(--gold);
  text-shadow: 0 0 8px var(--gold-glow);
  transition: text-shadow var(--transition-base);
}

.stat--essence.is-glowing .stat__value {
  text-shadow: 0 0 16px rgba(212, 175, 55, 0.6);
}

.code-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.code-btn--download {
  color: var(--gold);
  border-color: var(--gold-dim);
  background: rgba(212, 175, 55, 0.08);
}

.code-btn--download:hover {
  border-color: var(--gold);
}

.code-btn--upload {
  color: var(--text-secondary);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.code-btn--upload:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

/* Upload panel overlay */
.upload-panel {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 420px;
  width: 90vw;
  text-align: center;
}

.upload-panel__title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--gold-dim);
  margin-bottom: var(--space-sm);
}

.upload-panel__desc {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.upload-panel__file-label {
  display: block;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-primary);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: var(--space-sm);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.upload-panel__file-label:hover {
  border-color: var(--gold-dim);
  background: rgba(212, 175, 55, 0.05);
}

.upload-panel__file-label.is-ready {
  border-color: var(--gold);
  border-style: solid;
  background: rgba(212, 175, 55, 0.08);
}

.upload-panel__file-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.upload-panel__file-input {
  display: none;
}

.upload-panel__filename {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--gold-dim);
  min-height: 1.2em;
  margin-bottom: var(--space-md);
}

.upload-panel__btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-sm) var(--space-lg);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), opacity var(--transition-fast);
}

.upload-panel__btn:hover:not(:disabled) {
  border-color: var(--gold-dim);
}

.upload-panel__btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.upload-panel__error {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: #e74c3c;
  min-height: 1.2em;
  margin-top: var(--space-sm);
}

/* ===== SECTION NAVIGATION ===== */
.section-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-nav);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.section-nav::-webkit-scrollbar {
  display: none;
}

.section-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
  position: relative;
  flex-shrink: 0;
}

.section-tab:hover {
  color: var(--text-secondary);
}

.section-tab.is-active {
  color: var(--text-primary);
}

.section-tab__name {
  font-size: 0.7rem;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 0.3em;
}

.section-tab__numeral {
  opacity: 0.7;
}

.section-tab__progress {
  font-size: 0.6rem;
  opacity: 0.6;
  position: relative;
}

.section-tab__progress.has-new::after {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--gold);
  border-radius: 50%;
  margin-left: 4px;
  vertical-align: middle;
  box-shadow: 0 0 4px var(--gold), 0 0 8px var(--gold-glow);
  animation: sectionDotPulse 1.5s ease-in-out infinite;
}

@keyframes sectionDotPulse {
  0%, 100% { opacity: 0.6; box-shadow: 0 0 3px var(--gold-glow); }
  50% { opacity: 1; box-shadow: 0 0 6px var(--gold), 0 0 14px var(--gold-glow); }
}

/* ===== INTRO / RULES ===== */
.intro {
  margin-top: calc(var(--header-h) + var(--nav-h));
  padding: var(--space-lg) var(--space-lg) 0;
}

.intro__inner {
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  background: rgba(26, 26, 26, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  text-align: center;
}

/* Toggle button — mystical eye */
.intro__toggle {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: none;
  border: none;
  color: var(--gold-dim);
  cursor: pointer;
  padding: 4px;
  line-height: 0;
  opacity: 0.5;
  transition: opacity var(--transition-fast), color var(--transition-fast);
  z-index: 1;
}

.intro__toggle:hover {
  opacity: 1;
  color: var(--gold);
}

.intro__eye-iris,
.intro__eye-pupil,
.intro__eye-lower {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Collapsed state — eye closes */
.intro__inner.is-collapsed .intro__eye-iris,
.intro__inner.is-collapsed .intro__eye-pupil {
  opacity: 0;
}

.intro__inner.is-collapsed .intro__eye-lower {
  transform: scaleY(0);
  transform-origin: center top;
}

/* Collapse content */
.intro__text,
.intro__note {
  transition: opacity 0.3s ease, max-height 0.4s ease;
  overflow: hidden;
}

.intro__inner.is-collapsed .intro__text,
.intro__inner.is-collapsed .intro__note {
  max-height: 0;
  opacity: 0;
  margin: 0;
  padding: 0;
  border: none;
}

.intro__text {
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.intro__highlight {
  color: var(--gold);
  font-weight: 600;
}

.intro__tier {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.intro__tier--s { color: var(--text-secondary); }
.intro__tier--r { color: #5bc0eb; }
.intro__tier--e { color: #a855f7; }
.intro__tier--l { color: var(--gold); }

.intro__note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.7;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.intro__link {
  text-decoration: none;
  border-bottom: 1px dotted var(--gold-dim);
  transition: border-color var(--transition-fast);
  cursor: pointer;
}

.intro__link:hover {
  border-bottom-color: var(--gold);
}

.intro__code-example {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* ===== MAIN CONTENT ===== */
.content {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-lg);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-3xl);
  min-height: calc(100vh - var(--header-h) - var(--nav-h));
}

.content__main {
  min-width: 0;
}

/* Section hero banner */
.section-hero {
  position: relative;
  width: 100%;
  height: 300px;
  overflow: hidden;
  margin-bottom: var(--space-xl);
}

.section-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.55;
  transition: opacity var(--transition-slow);
}

.section-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(10, 10, 10, 0.1) 0%,
    rgba(10, 10, 10, 0.4) 60%,
    var(--bg-primary) 100%
  );
}

.section-hero__text {
  position: absolute;
  bottom: var(--space-xl);
  left: var(--space-lg);
  right: var(--space-lg);
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-hero__numeral {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  opacity: 0.5;
  margin-bottom: var(--space-xs);
}

.section-hero__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: 0.08em;
}

.section-hero__poem {
  position: absolute;
  right: 0;
  top: 0;
  max-width: min(380px, 55%);
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 0.4em;
  padding: var(--space-md) var(--space-lg);
}

.section-hero__poem span {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.82rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.015em;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}

/* ===== CONTAINER ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== SIDEBAR (Ritual Altar) ===== */
.sidebar {
  position: sticky;
  top: calc(var(--header-h) + var(--nav-h) + var(--space-md));
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-md);
  background: rgba(26, 26, 26, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  max-height: calc(100vh - var(--header-h) - var(--nav-h) - var(--space-xl));
  overflow-y: auto;
  scrollbar-width: thin;
}

.altar__heading {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-bottom: var(--space-sm);
}

.altar__panel {
  padding: var(--space-sm) var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* ===== OVERLAY BASE ===== */
.overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.overlay[hidden] {
  display: none;
}

.overlay.is-visible {
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
  opacity: 1;
}

.overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ===== SITE FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.site-footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.site-footer__brand {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  color: var(--gold-dim);
  margin-bottom: var(--space-md);
}

.site-footer__nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-md);
}

.site-footer__nav a {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.site-footer__nav a:hover {
  color: var(--gold);
}

.site-footer__legal {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}