/* Full Stack — Part III · Editorial long-form */

.fs-page-root {
  scroll-behavior: smooth;
}

.fs-page {
  --fs-gold: #F5C400;
  --fs-gold-dim: rgba(245, 196, 0, 0.12);
  --fs-gold-border: rgba(245, 196, 0, 0.28);
  --fs-text: #f0ece0;
  --fs-muted: #7a7f8e;
  --fs-card: #111827;
  --fs-border: rgba(255, 255, 255, 0.08);
  --fs-content: 740px;
  --fs-top-h: 52px;

  background: var(--bg);
  color: var(--fs-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  min-height: 100vh;
}

/* ─── Sticky top bar ───────────────────────────────────── */
.fs-top {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  gap: 10px;
  height: var(--fs-top-h);
  padding: 0 20px;
  background: rgba(10, 15, 30, 0.94);
  border-bottom: 1px solid var(--fs-gold-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.fs-top-back {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fs-muted);
  white-space: nowrap;
  transition: color 0.2s ease;
}

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

.fs-top-divider {
  color: var(--text-faint);
  font-size: 12px;
}

.fs-top-sub {
  font-size: 13px;
  color: var(--fs-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fs-top-spacer {
  flex: 1;
}

.fs-top-progress {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fs-muted);
  white-space: nowrap;
}

.fs-progress-bar {
  position: sticky;
  top: var(--fs-top-h);
  z-index: calc(var(--z-nav) - 1);
  height: 2px;
  background: rgba(2, 43, 86, 0.5);
}

.fs-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--fs-gold);
  transition: width 0.15s ease-out;
}

/* ─── Chapter dot nav (desktop) ────────────────────────── */
.fs-chapter-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: calc(var(--z-nav) - 2);
}

.fs-chapter-dots {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0;
  padding: 0;
}

.fs-chapter-dot {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-direction: row-reverse;
  text-decoration: none;
  color: inherit;
}

.fs-chapter-dot-pip {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--fs-gold-border);
  background: transparent;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  flex-shrink: 0;
}

.fs-chapter-dot-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--fs-muted);
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
  pointer-events: none;
}

.fs-chapter-dot:hover .fs-chapter-dot-label,
.fs-chapter-dot.is-active .fs-chapter-dot-label {
  opacity: 1;
  transform: translateX(0);
}

.fs-chapter-dot:hover .fs-chapter-dot-pip,
.fs-chapter-dot.is-active .fs-chapter-dot-pip {
  background: var(--fs-gold);
  border-color: var(--fs-gold);
}

.fs-chapter-dot.is-active .fs-chapter-dot-pip {
  transform: scale(1.2);
}

/* ─── Mobile contents button ───────────────────────────── */
.fs-contents-btn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 16px;
  z-index: var(--z-nav);
  padding: 10px 14px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--bg);
  background: var(--fs-gold);
  border: 1px solid var(--fs-gold);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.fs-contents-panel {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) + 10);
  background: rgba(4, 8, 18, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: flex-end;
  justify-content: center;
  padding: 20px;
}

/* hidden attr must win over display:flex — otherwise panel blocks entire page on load */
.fs-contents-panel[hidden] {
  display: none !important;
}

.fs-contents-panel:not([hidden]) {
  display: flex;
}

.fs-contents-panel-inner {
  width: 100%;
  max-width: 400px;
  background: var(--fs-card);
  border: 1px solid var(--fs-border);
  border-radius: 16px;
  padding: 20px 24px 28px;
}

.fs-contents-heading {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fs-gold);
  margin-bottom: 16px;
}

.fs-contents-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.fs-contents-panel li + li {
  margin-top: 4px;
}

.fs-contents-panel a {
  display: block;
  padding: 10px 0;
  font-size: 15px;
  color: var(--fs-text);
  border-bottom: 1px solid var(--fs-border);
  transition: color 0.2s ease;
}

.fs-contents-panel a:hover {
  color: var(--fs-gold);
}

/* ─── Entry section ────────────────────────────────────── */
.fs-entry {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 100px;
  background: #050810;
  text-align: center;
}

.fs-entry-logo {
  position: absolute;
  top: 28px;
  left: 28px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fs-muted);
}

.fs-entry-logo-mark {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--fs-gold-border);
  border-radius: 6px;
  font-size: 13px;
  color: var(--fs-gold);
}

.fs-entry-content {
  max-width: var(--fs-content);
}

.fs-entry-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 400;
  font-style: italic;
  line-height: 1.25;
  color: var(--fs-text);
  margin-bottom: 20px;
}

.fs-entry-subhead {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 400;
  color: var(--fs-gold);
  margin-bottom: 36px;
}

.fs-entry-body {
  max-width: 580px;
  margin: 0 auto;
}

.fs-entry-body p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--fs-muted);
  margin-bottom: 12px;
}

.fs-entry-scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.fs-entry-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--fs-gold), transparent);
  animation: fsScrollPulse 2s ease-in-out infinite;
}

.fs-entry-scroll-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fs-muted);
}

@keyframes fsScrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(0.8); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ─── Main content ─────────────────────────────────────── */
.fs-main {
  background: var(--bg);
}

.fs-chapter {
  position: relative;
  padding: 80px 24px 100px;
}

.fs-chapter:nth-child(even) {
  background: rgba(17, 24, 39, 0.35);
}

.fs-chapter-inner {
  position: relative;
  max-width: var(--fs-content);
  margin: 0 auto;
}

.fs-chapter-bg-num {
  position: absolute;
  top: -20px;
  left: -10px;
  font-family: var(--font-display);
  font-size: clamp(120px, 20vw, 200px);
  font-weight: 700;
  line-height: 1;
  color: var(--fs-text);
  opacity: 0.04;
  pointer-events: none;
  user-select: none;
}

.fs-chapter-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fs-gold);
  opacity: 0.75;
  margin-bottom: 16px;
}

.fs-chapter-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 400;
  font-style: italic;
  line-height: 1.2;
  color: var(--fs-text);
  margin-bottom: 28px;
}

.fs-chapter-divider {
  width: 60px;
  height: 1px;
  background: var(--fs-gold);
  margin-bottom: 40px;
}

.fs-chapter-body > * + * {
  margin-top: 32px;
}

/* ─── Prose & callouts ─────────────────────────────────── */
.fs-prose p + p {
  margin-top: 1.25em;
}

.fs-callout {
  margin: 0;
  padding: 28px 32px;
  background: var(--fs-gold-dim);
  border-left: 3px solid var(--fs-gold);
  border-radius: 0 8px 8px 0;
}

.fs-callout p {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--fs-gold);
  margin: 0;
}

.fs-callout--center {
  text-align: center;
  border-left: none;
  border-top: 1px solid var(--fs-gold-border);
  border-bottom: 1px solid var(--fs-gold-border);
  border-radius: 0;
  background: transparent;
  padding: 36px 20px;
}

.fs-muted-center {
  text-align: center;
  padding: 24px 0 8px;
}

.fs-muted-center p {
  font-size: 15px;
  color: var(--fs-muted);
  line-height: 1.7;
}

.fs-inline-link {
  color: var(--fs-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s ease;
}

.fs-inline-link:hover {
  opacity: 0.8;
}

/* ─── Door cards ───────────────────────────────────────── */
.fs-doors {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.fs-door-card {
  background: var(--fs-card);
  border: 1px solid var(--fs-border);
  border-radius: 10px;
  padding: 22px 24px;
}

.fs-door-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fs-gold);
  opacity: 0.7;
  display: block;
  margin-bottom: 8px;
}

.fs-door-title {
  font-size: 17px;
  font-weight: 500;
  color: rgba(245, 196, 0, 0.9);
  margin-bottom: 10px;
}

.fs-door-desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--fs-text);
  margin: 0;
}

.fs-door-note {
  font-size: 13px;
  color: var(--fs-muted);
  margin-top: 10px;
  margin-bottom: 0;
}

/* ─── Subsections & timeline ───────────────────────────── */
.fs-subsection-title {
  font-family: var(--font-body);
  font-size: 20px;
  font-weight: 500;
  color: var(--fs-text);
  margin-bottom: 16px;
}

.fs-subsection-close {
  margin-top: 16px;
  font-size: 16px;
  color: var(--fs-text);
}

.fs-list {
  margin: 12px 0 0;
  padding-left: 1.25em;
}

.fs-list li {
  margin-bottom: 8px;
  font-size: 16px;
  line-height: 1.65;
}

.fs-list--inline {
  list-style: none;
  padding-left: 0;
}

.fs-list--inline li {
  margin-bottom: 6px;
}

.fs-timeline {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  position: relative;
}

.fs-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--fs-border);
}

.fs-timeline-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 28px;
}

.fs-timeline-item:last-child {
  padding-bottom: 0;
}

.fs-timeline-item::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--fs-gold);
  box-shadow: 0 0 0 3px var(--bg);
}

.fs-timeline-label {
  display: block;
  font-weight: 500;
  font-size: 16px;
  color: rgba(245, 196, 0, 0.9);
  margin-bottom: 6px;
}

.fs-timeline-desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--fs-text);
  margin: 0;
}

/* ─── Tool cards ───────────────────────────────────────── */
.fs-tools {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.fs-tool-card {
  background: var(--fs-card);
  border: 1px solid var(--fs-border);
  border-radius: 10px;
  padding: 24px 28px;
}

.fs-tool-card--featured {
  padding: 32px 32px;
  background: rgba(245, 196, 0, 0.06);
  border-color: var(--fs-gold-border);
}

.fs-tool-card--roadmap {
  opacity: 0.85;
}

.fs-tool-name {
  font-size: 18px;
  font-weight: 500;
  color: rgba(245, 196, 0, 0.95);
  margin-bottom: 6px;
}

.fs-tool-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fs-muted);
  border: 1px solid var(--fs-border);
  padding: 2px 8px;
  border-radius: 4px;
  vertical-align: middle;
  margin-left: 8px;
}

.fs-tool-tagline {
  font-size: 15px;
  color: var(--fs-muted);
  margin-bottom: 10px;
}

.fs-tool-desc {
  font-size: 15px;
  line-height: 1.65;
  margin: 0;
}

/* ─── Pricing ──────────────────────────────────────────── */
.fs-pricing-plans {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.fs-plan {
  background: var(--fs-card);
  border: 1px solid var(--fs-border);
  border-radius: 10px;
  padding: 24px;
}

.fs-plan--highlight {
  border-color: var(--fs-gold-border);
  background: var(--fs-gold-dim);
}

.fs-plan-name {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 4px;
}

.fs-plan-price {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--fs-gold);
  margin-bottom: 16px;
}

.fs-setup {
  background: var(--fs-card);
  border: 1px solid var(--fs-border);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 16px;
}

.fs-setup-label {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 12px;
}

.fs-setup-price {
  color: var(--fs-gold);
  font-family: var(--font-mono);
  font-size: 14px;
}

.fs-addons-label {
  font-size: 14px;
  color: var(--fs-muted);
  margin-bottom: 8px;
}

/* ─── FAQ accordion ────────────────────────────────────── */
.fs-faq {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fs-faq-item {
  background: var(--fs-card);
  border: 1px solid var(--fs-border);
  border-radius: 10px;
  overflow: hidden;
}

.fs-faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 16px;
  font-weight: 500;
  color: var(--fs-text);
  background: transparent;
  transition: color 0.2s ease;
}

.fs-faq-q:hover {
  color: var(--fs-gold);
}

.fs-faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
}

.fs-faq-icon::before,
.fs-faq-icon::after {
  content: '';
  position: absolute;
  background: var(--fs-gold);
  transition: transform 0.25s ease;
}

.fs-faq-icon::before {
  top: 9px;
  left: 3px;
  right: 3px;
  height: 2px;
}

.fs-faq-icon::after {
  left: 9px;
  top: 3px;
  bottom: 3px;
  width: 2px;
}

.fs-faq-q[aria-expanded="true"] .fs-faq-icon::after {
  transform: scaleY(0);
}

.fs-faq-a {
  padding: 0 22px 18px;
}

.fs-faq-a p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--fs-muted);
  margin: 0;
}

/* ─── Closing ──────────────────────────────────────────── */
.fs-closing {
  background: #0d1220;
  border-top: 1px solid var(--fs-border);
  padding: 100px 24px 60px;
  text-align: center;
}

.fs-closing-inner {
  max-width: var(--fs-content);
  margin: 0 auto;
}

.fs-closing-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fs-gold);
  margin-bottom: 20px;
}

.fs-closing-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 400;
  font-style: italic;
  line-height: 1.25;
  margin-bottom: 28px;
}

.fs-closing-body {
  max-width: 560px;
  margin: 0 auto 36px;
}

.fs-closing-body p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--fs-muted);
  margin-bottom: 12px;
}

.fs-closing-cta {
  display: inline-block;
  padding: 16px 32px;
  background: var(--fs-gold);
  color: var(--navy-deep);
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  transition: background 0.2s ease, transform 0.2s ease;
  margin-bottom: 28px;
}

.fs-closing-cta:hover {
  background: #ffcf1a;
  transform: translateY(-1px);
}

.fs-closing-links {
  font-size: 14px;
  color: var(--fs-muted);
  margin-bottom: 48px;
}

.fs-closing-links a {
  color: var(--fs-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.fs-closing-links a:hover {
  color: var(--fs-gold);
}

.fs-closing-links-sep {
  margin: 0 10px;
  opacity: 0.4;
}

.fs-closing-footer {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--fs-muted);
  opacity: 0.6;
}

/* ─── Responsive ───────────────────────────────────────── */
@media (max-width: 900px) {
  .fs-chapter-nav {
    display: none;
  }

  .fs-contents-btn {
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .fs-doors {
    grid-template-columns: 1fr;
  }

  .fs-pricing-plans {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .fs-top-sub {
    display: none;
  }

  .fs-entry-logo {
    left: 16px;
    top: 20px;
  }

  .fs-chapter {
    padding: 60px 20px 72px;
  }

  .fs-callout {
    padding: 20px 22px;
  }

  .fs-closing-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .fs-closing-links-sep {
    display: none;
  }
}