/* ============================================================
   AI LABORATORY & SOFTWARE ENGINEERING PORTFOLIO DESIGN SYSTEM
   SAGIT FATURRAKHMAN — 2026
   ============================================================ */

:root {
  /* Core Clinical Laboratory Palette */
  --bg-deep: #020b12;
  --bg-navy: #040d15;
  --bg-panel: rgba(6, 18, 30, 0.75);
  --bg-card: #061522;
  --bg-card-inner: #081a2b;

  --text-white: #ffffff;
  --text-soft: #eaf8ff;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-dark: #1e293b;

  --cyan-core: #38bdf8;
  --cyan-light: #7dd3fc;
  --cyan-deep: #0284c7;
  --cyan-dim: #0369a1;

  --border-line: rgba(56, 189, 248, 0.18);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(56, 189, 248, 0.5);

  --font-main: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.18s var(--ease-spring);
  --transition-normal: 0.3s var(--ease-spring);
  --transition-slow: 0.5s var(--ease-spring);
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--bg-deep);
}

body.lab-body {
  position: relative;
  min-height: 100vh;
  font-family: var(--font-main);
  color: var(--text-soft);
  background-color: var(--bg-deep);
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 3D Background Canvas */
.lab-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* Subtle Ambient Laboratory Grids */
.lab-grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.035) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(circle at 50% 50%, black 45%, transparent 95%);
}

.lab-vignette {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(circle at center, transparent 40%, rgba(2, 11, 18, 0.8) 100%);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  color: var(--text-white);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

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

/* ============================================================
   DOUBLE-BEZEL HARDWARE CONTAINER ARCHITECTURE
   ============================================================ */
.double-bezel {
  position: relative;
  background: rgba(6, 20, 34, 0.5);
  border: 1px solid var(--border-line);
  border-radius: 16px;
  padding: 5px;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.45);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.double-bezel:hover {
  border-color: var(--border-active);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55), 0 0 20px rgba(56, 189, 248, 0.08);
}

.bezel-inner {
  position: relative;
  background: linear-gradient(180deg, rgba(8, 25, 42, 0.88) 0%, rgba(4, 15, 26, 0.96) 100%);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 24px;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.08);
  height: 100%;
}

/* ============================================================
   MODERN REFINED BUTTONS (Anti-Slop Human Frontend Engineering)
   ============================================================ */
.btn-clean {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 8px;
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn-clean:active {
  transform: scale(0.98);
}

/* Primary Button: Clean High-Contrast Dark-Cyan */
.btn-clean.primary {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-clean.primary:hover {
  background: #0ea5e9;
  border-color: #7dd3fc;
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.45);
  transform: translateY(-2px);
}

/* Secondary Button: Clean Precision Glass */
.btn-clean.secondary {
  background: rgba(6, 22, 38, 0.8);
  color: var(--text-soft);
  border: 1px solid var(--border-line);
}

.btn-clean.secondary:hover {
  background: rgba(12, 34, 56, 0.95);
  border-color: var(--cyan-core);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.btn-arrow {
  width: 15px;
  height: 15px;
  transition: transform var(--transition-fast);
}

.btn-clean:hover .btn-arrow {
  transform: translateX(3px);
}

/* ============================================================
   TOPBAR NAVIGATION
   ============================================================ */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(2, 11, 18, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-line);
  height: 68px;
}

.topbar-inner {
  max-width: 1600px;
  height: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-title .name {
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-white);
}

.brand-title .role {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--cyan-core);
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--cyan-light);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan-core);
}

.topbar-actions {
  display: flex;
  align-items: center;
}

.btn-topbar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(6, 22, 38, 0.85);
  border: 1px solid var(--border-line);
  border-radius: 6px;
  color: var(--text-white);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: all var(--transition-fast);
}

.btn-topbar:hover {
  background: #0284c7;
  border-color: var(--cyan-light);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-icon-svg {
  width: 14px;
  height: 14px;
}

/* ============================================================
   LEFT CHAPTER RAIL NAVIGATION (STICKY SIDEBAR)
   ============================================================ */
.left-chapter-rail {
  position: fixed;
  left: 28px;
  top: 90px;
  bottom: 40px;
  z-index: 80;
  width: 110px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  pointer-events: none;
}

.rail-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 18px;
  pointer-events: auto;
  border-left: 1px solid rgba(56, 189, 248, 0.15);
}

.rail-progress-bar {
  position: absolute;
  left: -1px;
  top: 0;
  width: 2px;
  height: 10%;
  background: var(--cyan-core);
  box-shadow: 0 0 10px var(--cyan-core);
  transition: height 0.25s ease-out;
}

.rail-item {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  opacity: 0.4;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.rail-item:hover, .rail-item.active {
  opacity: 1;
  transform: translateX(4px);
}

.rail-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
}

.rail-item.active .rail-num {
  color: var(--cyan-light);
}

.rail-label {
  display: none;
}

/* ============================================================
   MAIN LAYOUT & CHAPTER SECTIONS
   ============================================================ */
.main-container {
  position: relative;
  z-index: 10;
  max-width: 1440px;
  margin: 0 auto;
  padding-left: 140px;
  padding-right: 48px;
  padding-top: 68px;
}

.chapter-section {
  position: relative;
  min-height: 100vh;
  padding: 80px 0 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-bottom: 1px solid var(--border-subtle);
}

.chapter-rail-badge {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 20px;
}

.badge-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--cyan-light);
  line-height: 1;
}

.badge-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.lab-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.eyebrow-line {
  width: 20px;
  height: 2px;
  background: var(--cyan-core);
}

.eyebrow-text {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cyan-light);
  text-transform: uppercase;
}

.section-heading {
  font-size: clamp(2rem, 3.6vw, 3.2rem);
  font-weight: 700;
  line-height: 1.12;
  color: var(--text-white);
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.section-subtext {
  max-width: 65ch;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 32px;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 20%, #7dd3fc 60%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================================
   CHAPTER 01 — HERO / LABORATORY ENTRY
   ============================================================ */
.chapter-hero {
  min-height: calc(100vh - 68px);
  padding-top: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.hero-centered-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

.hero-centered-content .lab-eyebrow {
  margin-bottom: 20px;
}

.hero-main-title {
  font-size: clamp(2.4rem, 4.4vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-bottom: 20px;
}

.hero-description {
  font-size: 1.12rem;
  color: var(--text-muted);
  max-width: 62ch;
  line-height: 1.65;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-bottom: 36px;
}

.social-connect-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
}

.connect-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.social-icons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.social-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: rgba(6, 22, 38, 0.75);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.social-btn:hover {
  color: var(--cyan-light);
  border-color: var(--cyan-core);
  background: rgba(10, 34, 58, 0.95);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.2);
}

.social-btn svg {
  width: 18px;
  height: 18px;
}

/* Flowing Engineering Domains Marquee Ribbon */
.hero-domains-ribbon {
  width: 100%;
  max-width: 880px;
  margin-top: 10px;
}

.hero-domains-ribbon .bezel-inner {
  padding: 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.domains-ribbon-head {
  text-align: center;
}

.ribbon-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cyan-light);
  text-transform: uppercase;
}

/* Horizontal Flowing Capabilities Marquee */
.marquee-wrapper {
  overflow: hidden;
  position: relative;
  width: 100%;
  padding: 4px 0;
  mask-image: linear-gradient(90deg, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, black 10%, black 90%, transparent 100%);
}

.marquee-track {
  display: flex;
  gap: 12px;
  width: max-content;
  white-space: nowrap;
}

.track-left {
  animation: marquee-left 24s linear infinite;
}

.track-right {
  animation: marquee-right 28s linear infinite;
}

.stream-pill {
  padding: 8px 16px;
  background: rgba(6, 22, 38, 0.7);
  border: 1px solid var(--border-line);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.08em;
}

.stream-pill.alt {
  background: rgba(8, 30, 50, 0.7);
  border-color: rgba(56, 189, 248, 0.25);
  color: #ffffff;
}

@keyframes marquee-left {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes marquee-right {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

/* ============================================================
   CHAPTER 02 — ABOUT THE ENGINEER
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1.2fr 1fr;
  gap: 32px;
  align-items: stretch;
}

.portrait-hud-frame {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 360px;
  border-radius: 8px;
  overflow: hidden;
  background: #020b12;
}

.engineer-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.corner-bracket {
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid var(--cyan-core);
  pointer-events: none;
}

.corner-bracket.top-left { top: 8px; left: 8px; border-right: 0; border-bottom: 0; }
.corner-bracket.top-right { top: 8px; right: 8px; border-left: 0; border-bottom: 0; }
.corner-bracket.bottom-left { bottom: 8px; left: 8px; border-right: 0; border-top: 0; }
.corner-bracket.bottom-right { bottom: 8px; right: 8px; border-left: 0; border-top: 0; }

.portrait-overlay-hud {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 12px;
  background: linear-gradient(180deg, transparent 0%, rgba(2, 11, 18, 0.95) 100%);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
}

.about-bio-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.bio-text {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 28px;
}

.identity-meta-grid {
  display: grid;
  gap: 14px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan-core);
}

.meta-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
}

.meta-val {
  font-size: 0.92rem;
  color: var(--text-white);
}

.meta-val.status-open {
  color: #4ade80;
}

.about-focus-col {
  display: flex;
  flex-direction: column;
}

.focus-header {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--text-white);
  margin-bottom: 16px;
}

.core-focus-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  height: 100%;
}

.focus-card .bezel-inner {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
}

.focus-icon {
  width: 28px;
  height: 28px;
  color: var(--cyan-core);
}

.focus-icon svg {
  width: 100%;
  height: 100%;
}

.focus-card strong {
  font-size: 0.85rem;
  color: var(--text-white);
}

/* ============================================================
   CHAPTER 03 — ENGINEERING JOURNEY
   ============================================================ */
.journey-layout {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 36px;
  align-items: stretch;
}

.journey-timeline-track {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.timeline-connector {
  width: 2px;
  height: 12px;
  margin-left: 24px;
  background: var(--cyan-core);
}

.step-time {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
  margin-bottom: 6px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 4px;
}

.step-major {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan-core);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.journey-summary-box .bezel-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: 32px;
}

.summary-kicker {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-core);
  letter-spacing: 0.16em;
}

.journey-summary-box h3 {
  font-size: 1.3rem;
  color: var(--text-white);
}

.journey-summary-box p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.structure-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.structure-pills span {
  padding: 6px 12px;
  border-radius: 6px;
  background: rgba(6, 22, 38, 0.7);
  border: 1px solid var(--border-line);
  font-size: 0.75rem;
  color: var(--cyan-light);
}

/* ============================================================
   CHAPTER 04 — SYSTEM ARCHITECTURE
   ============================================================ */
.arch-diagram-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.arch-node .bezel-inner {
  padding: 20px 14px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.node-icon {
  width: 28px;
  height: 28px;
  color: var(--cyan-core);
}

.node-icon svg {
  width: 100%;
  height: 100%;
}

.node-label {
  font-size: 0.88rem;
  color: var(--text-white);
  letter-spacing: 0.06em;
}

.node-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
}

.arch-arrow {
  color: var(--cyan-core);
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
}

.infra-bar {
  margin-bottom: 32px;
}

.infra-bar .bezel-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 22px;
}

.infra-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: #020b12;
  background: var(--cyan-core);
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: 0.1em;
}

.infra-items {
  font-size: 0.88rem;
  color: var(--text-soft);
}

.what-i-work-with {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sub-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan-light);
}

.tech-pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-pill {
  padding: 8px 16px;
  border-radius: 6px;
  background: rgba(6, 22, 38, 0.7);
  border: 1px solid var(--border-line);
  color: var(--text-soft);
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.tech-pill:hover {
  border-color: var(--cyan-core);
  color: var(--cyan-light);
  transform: translateY(-2px);
}

/* ============================================================
   CHAPTER 05 — AI ENGINEERING
   ============================================================ */
.ai-split-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.ai-pipeline-flow {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.pipeline-card .bezel-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
}

.pipe-step {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--cyan-core);
}

.pipe-name {
  font-size: 0.95rem;
  color: var(--text-white);
  min-width: 140px;
}

.pipe-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pipe-arrow {
  text-align: center;
  color: var(--cyan-core);
  font-size: 0.85rem;
  line-height: 1;
}

.ai-capabilities-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-brain-card .bezel-inner {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hud-badge {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--cyan-core);
  letter-spacing: 0.12em;
}

.ai-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-tech-tags span {
  padding: 6px 12px;
  border-radius: 6px;
  background: rgba(6, 22, 38, 0.8);
  border: 1px solid var(--border-line);
  font-size: 0.78rem;
  color: var(--text-soft);
}

.ai-philosophy-box {
  padding: 18px;
  border-radius: 8px;
  background: rgba(2, 11, 18, 0.6);
  border: 1px solid var(--border-subtle);
}

.ai-philosophy-box h4 {
  font-size: 0.95rem;
  color: var(--text-white);
  margin-bottom: 6px;
}

.ai-philosophy-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ============================================================
   CHAPTER 06 — DATA & KNOWLEDGE INFRASTRUCTURE
   ============================================================ */
.data-pipeline-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.data-step-box .bezel-inner {
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}

.d-step-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--cyan-core);
}

.d-icon {
  width: 28px;
  height: 28px;
  color: var(--cyan-light);
}

.d-icon svg {
  width: 100%;
  height: 100%;
}

.data-step-box strong {
  font-size: 0.82rem;
  color: var(--text-white);
  letter-spacing: 0.05em;
}

.data-step-box p {
  font-size: 0.72rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.data-tech-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 16px 20px;
  border-radius: 8px;
  background: rgba(6, 20, 34, 0.6);
  border: 1px solid var(--border-line);
}

.bar-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.1em;
}

.bar-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.bar-chips span {
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(2, 11, 18, 0.8);
  border: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ============================================================
   CHAPTER 07 — AI ENGINEERING TOOLCHAIN (Vector Icons)
   ============================================================ */
.toolchain-category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tool-cat-card .bezel-inner {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cat-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.cat-icon-wrap {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan-core);
}

.cat-icon-wrap svg {
  width: 20px;
  height: 20px;
}

.cat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-core);
}

.cat-title {
  font-size: 0.95rem;
  color: var(--text-white);
  letter-spacing: 0.08em;
}

.cat-items {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   CHAPTER 08 — PROJECT ARCHIVE
   ============================================================ */
.projects-master-grid {
  display: grid;
  gap: 32px;
}

.project-master-card .bezel-inner {
  padding: 32px;
}

.project-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.project-category-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.badge-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--cyan-light);
  margin-right: 6px;
}

.proj-badge {
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--border-line);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.08em;
}

.proj-status-live {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: #4ade80;
  letter-spacing: 0.12em;
}

.proj-status-research {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
}

.project-body-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.proj-name {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-white);
  margin-bottom: 4px;
}

.proj-subtitle {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--cyan-core);
  margin-bottom: 16px;
}

.proj-description {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

.proj-meta-section {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.meta-block strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
  margin-bottom: 2px;
}

.meta-block p {
  font-size: 0.85rem;
  color: var(--text-soft);
}

.project-action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Screen Mockup Frame */
.project-screen-mockup {
  border-radius: 8px;
  border: 1px solid var(--border-line);
  background: #020b12;
  overflow: hidden;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.mockup-window-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: rgba(8, 25, 42, 0.9);
  border-bottom: 1px solid var(--border-subtle);
}

.mock-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.mock-dot.red { background: #ef4444; }
.mock-dot.yellow { background: #eab308; }
.mock-dot.green { background: #22c55e; }

.mock-url {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-left: 8px;
}

.mockup-screen-inner {
  padding: 24px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.warungio-preview {
  background:
    radial-gradient(circle at top right, rgba(56, 189, 248, 0.15), transparent 50%),
    linear-gradient(135deg, #051829 0%, #020b12 100%);
}

.smartsort-preview {
  background:
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.12), transparent 50%),
    linear-gradient(135deg, #051829 0%, #020b12 100%);
}

.banner-badge {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
}

.mockup-hero-banner h4 {
  font-size: 1.05rem;
  color: var(--text-white);
  margin-top: 4px;
}

.mockup-stats-row {
  display: flex;
  gap: 16px;
  margin-top: 20px;
}

.stat-mini {
  padding: 8px 12px;
  border-radius: 6px;
  background: rgba(2, 11, 18, 0.65);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-mini span {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--text-dim);
}

.stat-mini strong {
  font-size: 0.78rem;
  color: var(--cyan-light);
}

/* Coming Soon Card */
.coming-soon-card {
  text-align: center;
}

.coming-soon-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 0;
}

.coming-title {
  font-size: 1.3rem;
  color: var(--text-white);
  margin: 12px 0 8px;
}

.coming-desc {
  max-width: 55ch;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.coming-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.coming-tags span {
  padding: 6px 14px;
  border-radius: 6px;
  background: rgba(6, 22, 38, 0.7);
  border: 1px solid var(--border-line);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.1em;
}

/* ============================================================
   GITHUB CONTRIBUTIONS & ACTIVITY HEATMAP
   ============================================================ */
.github-activity-panel {
  margin-top: 36px;
  width: 100%;
}

.gh-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.gh-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.gh-icon {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: rgba(6, 22, 38, 0.9);
  border: 1px solid var(--border-line);
  display: grid;
  place-items: center;
  color: var(--cyan-light);
}

.gh-icon svg {
  width: 22px;
  height: 22px;
}

.gh-main-heading {
  display: block;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--text-white);
}

.gh-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
}

.gh-heatmap-wrap {
  padding: 20px;
  border-radius: 8px;
  background: rgba(2, 11, 18, 0.7);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  margin-bottom: 24px;
}

.gh-heatmap-legend-months {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-bottom: 10px;
  padding: 0 4px;
  min-width: 680px;
}

.gh-heatmap-grid {
  display: grid;
  grid-template-columns: repeat(52, 1fr);
  gap: 4px;
  min-width: 680px;
  margin-bottom: 14px;
}

.gh-heatmap-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gh-cell {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 2px;
  background: rgba(8, 25, 42, 0.9);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.gh-cell:hover {
  transform: scale(1.4);
  z-index: 5;
}

.gh-cell.lvl-0 { background: rgba(8, 25, 42, 0.85); }
.gh-cell.lvl-1 { background: rgba(14, 116, 144, 0.45); }
.gh-cell.lvl-2 { background: rgba(14, 165, 233, 0.65); }
.gh-cell.lvl-3 { background: rgba(56, 189, 248, 0.85); }
.gh-cell.lvl-4 { background: #38bdf8; box-shadow: 0 0 8px rgba(56, 189, 248, 0.6); }

.gh-heatmap-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  min-width: 680px;
}

.gh-stat-note strong {
  color: var(--cyan-light);
}

.gh-legend-levels {
  display: flex;
  align-items: center;
  gap: 5px;
}

.gh-legend-levels .lvl {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  display: inline-block;
}

.gh-legend-levels .lvl-0 { background: rgba(8, 25, 42, 0.85); }
.gh-legend-levels .lvl-1 { background: rgba(14, 116, 144, 0.45); }
.gh-legend-levels .lvl-2 { background: rgba(14, 165, 233, 0.65); }
.gh-legend-levels .lvl-3 { background: rgba(56, 189, 248, 0.85); }
.gh-legend-levels .lvl-4 { background: #38bdf8; }

.gh-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.gh-stat-box {
  padding: 14px 18px;
  border-radius: 6px;
  background: rgba(4, 18, 32, 0.7);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gh-stat-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.gh-stat-val {
  font-size: 1.1rem;
  color: var(--cyan-light);
}

/* ============================================================
   CHAPTER 09 — CERTIFICATES & TECHNICAL ARCHIVE
   ============================================================ */
.doc-filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.doc-tab {
  padding: 8px 18px;
  border-radius: 6px;
  background: rgba(6, 20, 34, 0.6);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.doc-tab:hover, .doc-tab.active {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
}

.docs-master-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.doc-entry-card .bezel-inner {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  padding: 20px;
  align-items: center;
}

.doc-badge-preview {
  position: relative;
  width: 140px;
  height: 140px;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.95);
  display: grid;
  place-items: center;
  padding: 10px;
}

.doc-badge-preview.exp-preview {
  background:
    radial-gradient(circle at center, rgba(56, 189, 248, 0.18), transparent 70%),
    linear-gradient(135deg, #071e33 0%, #030e1a 100%);
  border: 1px solid var(--border-line);
}

.exp-icon-svg {
  width: 44px;
  height: 44px;
  color: var(--cyan-light);
}

.doc-badge-preview.gallery-preview {
  background: #041220;
  border: 1px solid var(--border-line);
  padding: 0;
}

.doc-badge-preview.gallery-preview .doc-thumb {
  object-fit: cover;
}

.doc-thumb {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.doc-type-tag {
  position: absolute;
  top: 6px;
  left: 6px;
  background: #020b12;
  color: var(--cyan-light);
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.08em;
}

.doc-title {
  font-size: 1.1rem;
  color: var(--text-white);
  margin-bottom: 4px;
}

.doc-issuer {
  display: block;
  font-size: 0.82rem;
  color: var(--cyan-core);
  font-weight: 600;
  margin-bottom: 8px;
}

.doc-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.doc-footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.doc-date {
  color: var(--text-dim);
}

.doc-link-arrow {
  color: var(--cyan-light);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.credly-banner .bezel-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 32px;
}

.credly-info strong {
  display: block;
  font-size: 1.05rem;
  color: var(--text-white);
  margin-bottom: 4px;
}

.credly-info p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ============================================================
   CHAPTER 10 — CONTACT / FINAL CHAMBER
   ============================================================ */
.chapter-contact {
  min-height: 80vh;
}

.contact-master-panel .bezel-inner {
  padding: 48px;
}

.contact-header {
  margin-bottom: 36px;
}

.contact-main-heading {
  font-size: clamp(2rem, 3.8vw, 3.2rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-white);
  margin-bottom: 12px;
}

.contact-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 60ch;
}

.contact-methods-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 36px;
}

.contact-card {
  text-decoration: none;
}

.contact-card .bezel-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
}

.contact-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan-core);
  display: grid;
  place-items: center;
}

.contact-card-icon svg {
  width: 20px;
  height: 20px;
}

.contact-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.c-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-light);
  letter-spacing: 0.12em;
}

.c-val {
  font-size: 0.95rem;
  color: var(--text-white);
}

.contact-action-footer {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ============================================================
   GLOBAL FOOTER
   ============================================================ */
.global-footer {
  position: relative;
  z-index: 20;
  border-top: 1px solid var(--border-line);
  background: #020b12;
  padding: 36px 0;
}

.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 48px 0 140px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand strong {
  display: block;
  font-size: 0.85rem;
  color: var(--text-white);
  letter-spacing: 0.08em;
}

.footer-brand small {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--cyan-core);
}

.footer-quote {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* Scroll To Top Button */
.back-top-btn {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 90;
  width: 42px;
  height: 42px;
  border-radius: 6px;
  background: rgba(6, 22, 38, 0.85);
  border: 1px solid var(--border-line);
  color: var(--cyan-light);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.back-top-btn:hover {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-2px);
}

.back-top-btn svg {
  width: 18px;
  height: 18px;
}

/* ============================================================
   SECRET ADMIN CONTENT VAULT MODAL
   ============================================================ */
.secret-admin {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.secret-admin.open {
  display: flex;
}

.secret-admin-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 8, 14, 0.88);
  backdrop-filter: blur(20px);
}

.secret-admin-panel {
  position: relative;
  width: min(780px, 94vw);
  max-height: 90vh;
  overflow-y: auto;
}

.secret-admin-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.secret-kicker {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--cyan-core);
  letter-spacing: 0.16em;
}

.secret-close {
  background: none;
  border: 1px solid var(--border-line);
  color: var(--text-white);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 1rem;
}

.secret-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.secret-tab {
  padding: 8px 16px;
  border-radius: 6px;
  background: rgba(6, 22, 38, 0.7);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
}

.secret-tab.active {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
}

.secret-form {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.secret-form.active {
  display: grid;
}

.secret-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--cyan-light);
  font-weight: 700;
}

/* Empty Vault Placeholder State */
.empty-vault-state {
  width: 100%;
  grid-column: 1 / -1;
  text-align: center;
}

.empty-vault-state .bezel-inner {
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.empty-state-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(6, 22, 38, 0.8);
  border: 1px solid var(--border-line);
  display: grid;
  place-items: center;
  color: var(--cyan-core);
  margin-bottom: 6px;
}

.empty-state-icon svg {
  width: 26px;
  height: 26px;
}

.empty-vault-state h3 {
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--text-white);
}

.empty-vault-state p {
  max-width: 52ch;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

/* Footer Vault Trigger */
.footer-copy {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-vault-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(6, 22, 38, 0.7);
  border: 1px solid var(--border-line);
  color: var(--cyan-light);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: all var(--transition-fast);
}

.footer-vault-btn:hover {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-1px);
}

.footer-vault-btn svg {
  width: 14px;
  height: 14px;
}

.secret-form select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  background: #020b12;
  border: 1px solid var(--border-line);
  color: var(--text-white);
  font-family: var(--font-main);
  font-size: 0.85rem;
}

.backup-box {
  padding: 20px;
  border-radius: 8px;
  background: rgba(2, 11, 18, 0.75);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.backup-box h4 {
  font-size: 1rem;
  color: var(--text-white);
}

.backup-box p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.backup-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.file-import-label {
  cursor: pointer;
  margin: 0;
}

.secret-list-section {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}

.secret-list-section h4 {
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  color: var(--cyan-light);
  margin-bottom: 12px;
}

.secret-form label.full-width, .secret-form button, .backup-box.full-width {
  grid-column: 1 / -1;
}

.secret-form input, .secret-form textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  background: #020b12;
  border: 1px solid var(--border-line);
  color: var(--text-white);
  font-family: var(--font-main);
  font-size: 0.85rem;
}

.secret-form textarea {
  min-height: 80px;
  resize: vertical;
}

.secret-list {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.secret-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-radius: 6px;
  background: rgba(2, 11, 18, 0.7);
  border: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.secret-list-item button {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid #ef4444;
  color: #ef4444;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.68rem;
  font-weight: 700;
}

.secret-note {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.secret-note code {
  color: var(--cyan-light);
}

/* ============================================================
   RESPONSIVE DESIGN SYSTEM
   ============================================================ */
@media (max-width: 1280px) {
  .main-container {
    padding-left: 100px;
    padding-right: 32px;
  }
  .about-grid {
    grid-template-columns: 240px 1fr;
  }
  .about-focus-col {
    grid-column: 1 / -1;
  }
  .core-focus-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .toolchain-category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .data-pipeline-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }
  .main-container {
    padding-left: 32px;
    padding-right: 32px;
  }
  .left-chapter-rail {
    display: none;
  }
  .footer-inner {
    padding-left: 32px;
  }
  .hero-content-grid {
    grid-template-columns: 1fr;
  }
  .journey-layout {
    grid-template-columns: 1fr;
  }
  .arch-diagram-flow {
    grid-template-columns: 1fr;
  }
  .arch-arrow {
    transform: rotate(90deg);
    margin: 4px 0;
  }
  .ai-split-grid {
    grid-template-columns: 1fr;
  }
  .project-body-grid {
    grid-template-columns: 1fr;
  }
  .docs-master-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .topbar-inner {
    padding: 0 16px;
  }
  .main-container {
    padding: 68px 16px 40px;
  }
  .footer-inner {
    padding: 0 16px;
    flex-direction: column;
    align-items: flex-start;
  }
  .chapter-section {
    padding: 60px 0;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .core-focus-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .data-pipeline-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .toolchain-category-grid {
    grid-template-columns: 1fr;
  }
  .contact-methods-grid {
    grid-template-columns: 1fr;
  }
  .credly-banner .bezel-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .secret-form {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .core-focus-grid {
    grid-template-columns: 1fr;
  }
  .data-pipeline-grid {
    grid-template-columns: 1fr;
  }
  .doc-entry-card .bezel-inner {
    grid-template-columns: 1fr;
  }
  .doc-badge-preview {
    width: 100%;
    height: 120px;
  }
}