*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-base:        #0d1117;
  --bg-surface:     #161b22;
  --bg-card:        #1c2230;
  --bg-card-hover:  #202840;
  --border:         #2a3347;
  --border-light:   #3a4560;
  --accent:         #4f8ef7;
  --accent-dim:     #1a2e52;
  --accent-glow:    rgba(79, 142, 247, 0.12);
  --text-primary:   #e6ecf8;
  --text-secondary: #8b9ab8;
  --text-muted:     #556075;
  --mono:           'JetBrains Mono', monospace;
  --sans:           'Inter', sans-serif;
  --radius-sm:      4px;
  --radius-md:      8px;
  --radius-lg:      12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/*SCROLL REVEAL SYSTEM*/
.scroll-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.scroll-reveal.delay-1 { transition-delay: 0.12s; }
.scroll-reveal.delay-2 { transition-delay: 0.24s; }
.scroll-reveal.delay-3 { transition-delay: 0.36s; }
.scroll-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/*HERO ENTRANCE ANIMATIONS*/
.reveal-fade {
  opacity: 0;
  animation: fadeIn 0.8s ease forwards 0.3s;
}
.reveal-up {
  opacity: 0;
  transform: translateY(24px);
  animation: slideUp 0.7s ease forwards;
}
.reveal-up.delay-1 { animation-delay: 0.25s; }
.reveal-up.delay-2 { animation-delay: 0.45s; }
.reveal-up.delay-3 { animation-delay: 0.65s; }
.reveal-fade.delay-3 { animation-delay: 0.65s; }
.reveal-photo {
  opacity: 0;
  transform: translateX(24px);
  animation: slideInRight 0.8s ease forwards 0.2s;
}

@keyframes fadeIn {
  to { opacity: 1; }
}
@keyframes slideUp {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
  to { opacity: 1; transform: translateX(0); }
}

/*NAVBAR*/
.navbar {
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 100;
  padding: 0 5%;
  border-bottom: 1px solid transparent;
  transition: all 0.35s ease;
}
.navbar.fixed-top {
  position: fixed;
  background: rgba(13, 17, 23, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-logo {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}
.nav-dot { color: var(--accent); }
.navbar nav ul {
  list-style: none;
  display: flex;
  gap: 32px;
}
.navbar nav ul li a {
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
  position: relative;
  padding-bottom: 2px;
}
.navbar nav ul li a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.navbar nav ul li a:hover::after,
.navbar nav ul li a.active::after { width: 100%; }
.navbar nav ul li a:hover,
.navbar nav ul li a.active { color: var(--text-primary); }

/*HERO*/
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 100px 10% 80px;
  position: relative;
  overflow: hidden;
  gap: 60px;
}

/* Particle canvas */
#particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  max-width: 560px;
  z-index: 2;
  position: relative;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.8rem;
  font-family: var(--mono);
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #3fb950;
  flex-shrink: 0;
  animation: pulse-green 2.5s ease infinite;
}
@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 0 0 rgba(63, 185, 80, 0.4); }
  50%       { box-shadow: 0 0 0 5px rgba(63, 185, 80, 0); }
}

.hero-content h1 {
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.hero-name { display: block; }
.hero-role-wrap {
  display: inline-flex;
  align-items: center;
  color: var(--accent);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-family: var(--mono);
  font-weight: 400;
  margin-top: 6px;
}
.cursor {
  display: inline-block;
  color: var(--accent);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 44px;
}
.btn-primary {
  display: inline-block;
  padding: 10px 22px;
  background: var(--accent);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.btn-primary:hover {
  background: #3a7aee;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 142, 247, 0.3);
}
.btn-ghost {
  display: inline-block;
  padding: 10px 22px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 400;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.btn-ghost:hover {
  border-color: var(--border-light);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.hero-stack {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.stack-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-top: 4px;
  white-space: nowrap;
}
.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.stack-tags span {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(79, 142, 247, 0.18);
  transition: background 0.2s ease, border-color 0.2s ease;
}
.stack-tags span:hover {
  background: rgba(79, 142, 247, 0.18);
  border-color: var(--accent);
}

/* Hero photo */
.hero-photo-wrap {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}
.hero-photo-frame {
  width: 320px;
  height: 320px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  position: relative;
  z-index: 2;
  transition: border-color 0.3s ease, transform 0.4s ease;
}
.hero-photo-wrap:hover .hero-photo-frame {
  border-color: var(--border-light);
  transform: translateY(-4px);
}
.hero-photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(15%);
  transition: filter 0.4s ease;
}
.hero-photo-wrap:hover .hero-photo-frame img {
  filter: grayscale(0%);
}
.hero-photo-accent {
  position: absolute;
  top: 12px;
  left: 12px;
  width: 320px;
  height: 320px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--accent-dim);
  z-index: 1;
  transition: border-color 0.3s ease, top 0.4s ease, left 0.4s ease;
}
.hero-photo-wrap:hover .hero-photo-accent {
  top: 16px;
  left: 16px;
  border-color: rgba(79, 142, 247, 0.35);
}

/*SHARED SECTION*/
.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 100px 5%;
}
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}

/*ABOUT SECTION */
.about-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.about-section .section-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.about-text h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.about-body {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

/* Skill grid */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.skill {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: default;
  /* pop-in state */
  opacity: 0;
  transform: scale(0.85) translateY(10px);
  transition: opacity 0.4s ease, transform 0.4s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.skill.popped {
  opacity: 1;
  transform: scale(1) translateY(0);
}
.skill:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: scale(1) translateY(-3px);
  box-shadow: 0 4px 16px rgba(79, 142, 247, 0.15);
}
.skill img {
  width: 30px;
  height: 30px;
  object-fit: contain;
}
.skill span {
  font-size: 0.68rem;
  font-family: var(--mono);
  color: var(--text-muted);
  text-align: center;
}

/*PROJECTS SECTION*/
.projects-section { background: var(--bg-base); }
.projects-heading {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 48px;
}
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  transition: border-color 0.25s ease, transform 0.3s ease, box-shadow 0.3s ease;
}
/* animated left-border accent */
.project-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: var(--accent);
  border-radius: 0 0 0 var(--radius-lg);
  transition: height 0.35s ease;
}
.project-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35), 0 0 0 1px var(--border-light);
}
.project-card:hover::before { height: 100%; }

.project-card-inner {
  padding: 32px 36px;
}
.project-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
}
.project-index {
  font-size: 0.72rem;
  font-family: var(--mono);
  color: var(--accent);
}
.project-type {
  font-size: 0.72rem;
  font-family: var(--mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.project-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.project-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
  max-width: 680px;
}
.mono-inline {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 1px 6px;
  border-radius: 3px;
}
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}
.project-tech img {
  width: 24px;
  height: 24px;
  object-fit: contain;
  opacity: 0.6;
  transition: opacity 0.2s ease, transform 0.25s ease;
}
.project-tech img:hover {
  opacity: 1;
  transform: translateY(-3px) scale(1.15);
}
.project-links { margin-top: 4px; }
.btn-outline-small {
  display: inline-block;
  font-size: 0.78rem;
  font-family: var(--mono);
  color: var(--accent);
  border: 1px solid rgba(79, 142, 247, 0.3);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn-outline-small:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  transform: translateX(2px);
}

/*CHATBOT BUTTON + PULSE*/
.chatbot-pulse-ring {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  z-index: 999;
  animation: pulse-ring 3s ease-out infinite;
  pointer-events: none;
}
@keyframes pulse-ring {
  0%   { transform: scale(1);   opacity: 0.5; }
  70%  { transform: scale(1.7); opacity: 0; }
  100% { transform: scale(1.7); opacity: 0; }
}

#chatbot-button {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
#chatbot-button:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: scale(1.08);
}

#chatbot-label {
  position: fixed;
  bottom: 53px;
  right: 104px;
  font-size: 0.78rem;
  font-family: var(--mono);
  color: var(--text-secondary);
  opacity: 0;
  white-space: nowrap;
  animation: fadeInLabel 1s forwards 1.5s;
  z-index: 999;
  pointer-events: none;
}
#chatbot-label .arrow-right {
  margin-left: 4px;
  display: inline-block;
  animation: bounceArrow 1s infinite;
}
@keyframes bounceArrow {
  0%, 100% { transform: translateX(0); }
  50%       { transform: translateX(4px); }
}
@keyframes fadeInLabel {
  to { opacity: 1; }
}

/*CHATBOT MODAL*/
.chatbot-modal {
  display: none;
  position: fixed;
  bottom: 106px;
  right: 40px;
  width: 360px;
  height: 520px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  z-index: 1002;
  flex-direction: column;
  overflow: hidden;
  transform-origin: bottom right;
  animation: modalPop 0.25s ease forwards;
}
@keyframes modalPop {
  from { opacity: 0; transform: scale(0.92) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.chatbot-header {
  padding: 14px 18px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}
.chatbot-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}
.chatbot-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3fb950;
  animation: pulse-green 2.5s ease infinite;
}
#chatbot-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease;
}
#chatbot-close:hover { color: var(--text-primary); }
.chatbot-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 14px;
  gap: 10px;
}
#chatbot-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.user-msg, .bot-msg {
  max-width: 88%;
  padding: 9px 13px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.5;
  word-wrap: break-word;
  animation: msgSlide 0.25s ease forwards;
}
@keyframes msgSlide {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.user-msg {
  background: var(--accent);
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: var(--radius-sm);
}
.bot-msg {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  align-self: flex-start;
  border-bottom-left-radius: var(--radius-sm);
}
.msg-label {
  display: block;
  font-size: 0.62rem;
  font-family: var(--mono);
  opacity: 0.55;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.chatbot-input-row { flex-shrink: 0; }
#chatbot-input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: var(--sans);
  outline: none;
  transition: border-color 0.2s ease;
}
#chatbot-input::placeholder {
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.78rem;
}
#chatbot-input:focus { border-color: var(--accent); }

/*RESPONSIVE*/
@media (max-width: 900px) {
  .hero {
    flex-direction: column;
    padding: 120px 8% 80px;
    gap: 50px;
    text-align: center;
    align-items: center;
  }
  .hero-content { max-width: 100%; }
  .hero-eyebrow { justify-content: center; }
  .hero-actions { justify-content: center; }
  .hero-stack { flex-direction: column; align-items: center; }
  .hero-photo-frame { width: 240px; height: 240px; }
  .hero-photo-accent { width: 240px; height: 240px; }
  .about-section .section-inner { grid-template-columns: 1fr; gap: 50px; }
  .skill-grid { grid-template-columns: repeat(4, 1fr); }
  .project-card { width: 100%; }
  .project-card-inner { padding: 24px 20px; }
  .arch-diagram {
    grid-template-columns: repeat(3, 1fr);
    grid-template-areas:
      ". user ."
      "gha cf s3"
      "tf apigw lambda"
      ". dynamo .";
    max-width: 100%;
    width: 100%;
  }
  .arch-info-panel { max-width: 100%; width: 100%; }
  .arch-section .section-inner { padding: 80px 5%; }
}
@media (max-width: 600px) {
  .skill-grid { grid-template-columns: repeat(3, 1fr); }
  .chatbot-modal { width: calc(100vw - 20px); right: 10px; bottom: 100px; }
  #chatbot-button { bottom: 24px; right: 24px; }
  .chatbot-pulse-ring { bottom: 24px; right: 24px; }
  #chatbot-label { right: 88px; bottom: 37px; }
  .project-card { width: 100%; }
  .project-card-inner { padding: 20px 16px; }
  .section-inner { padding: 60px 4%; }
  .arch-section .section-inner { overflow: hidden; }
  .arch-diagram {
    grid-template-columns: repeat(2, 1fr);
    grid-template-areas:
      "user user"
      "gha tf"
      "cf s3"
      "apigw lambda"
      "dynamo dynamo";
    max-width: 100%;
    width: 100%;
    gap: 10px;
    padding: 10px 0 20px;
  }
  .arch-node { padding: 12px 6px; }
  .arch-info-panel { max-width: 100%; width: 100%; margin-top: 10px; }
}


/*VISITOR COUNTER */
.visitor-counter {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: var(--bg-card);
  padding: 5px 12px;
  border-radius: 20px;
}
.visitor-icon { display: flex; align-items: center; color: var(--accent); }
#visitor-count {
  color: var(--accent);
  font-weight: 500;
  min-width: 28px;
  transition: opacity 0.4s ease;
}
.visitor-label { color: var(--text-muted); }

/* CERT BADGE */
.cert-badge {
  position: absolute;
  bottom: -16px;
  right: -16px;
  z-index: 10;
  cursor: pointer;
}
.cert-badge-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--bg-card);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.cert-badge-icon img { width: 44px; height: 44px; object-fit: contain; }
.cert-badge-fallback {
  display: none;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
}
.cert-badge:hover .cert-badge-icon {
  border-color: var(--accent);
  transform: scale(1.08);
}
.cert-tooltip {
  position: absolute;
  bottom: 68px;
  right: 0;
  width: 200px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.cert-badge:hover .cert-tooltip,
.cert-badge.active .cert-tooltip {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.cert-tooltip-title {
  font-size: 0.7rem;
  font-family: var(--mono);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}
.cert-tooltip-sub {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.cert-tooltip-issuer {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.cert-verify-link {
  display: block;
  font-size: 0.75rem;
  font-family: var(--mono);
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 10px;
  transition: opacity 0.2s;
}
.cert-verify-link:hover { opacity: 0.75; }
.cert-second-slot {
  border-top: 1px solid var(--border);
  padding-top: 8px;
}
.cert-coming-soon {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--mono);
}
.cert-coming-soon em {
  color: #f0a500;
  font-style: normal;
}


/* ARCHITECTURE SECTION */

.arch-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.arch-heading {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.arch-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-family: var(--mono);
  margin-bottom: 48px;
}
.arch-diagram {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-template-rows: auto auto auto;
  grid-template-areas:
    ". . user . ."
    "gha tf cf s3 ."
    ". . apigw lambda dynamo";
  gap: 24px 16px;
  position: relative;
  padding: 20px 0 40px;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}
.arch-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  position: relative;
  z-index: 2;
  user-select: none;
}
.arch-node:hover, .arch-node.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-3px);
}
.arch-node.active { box-shadow: 0 0 0 2px var(--accent-dim); }
.arch-node-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}
.arch-node-icon img { width: 32px; height: 32px; object-fit: contain; }
.arch-node span {
  font-size: 0.7rem;
  font-family: var(--mono);
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.3;
}
.arch-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: visible;
}
.arch-info-panel {
  margin-top: 8px;
  min-height: 90px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  max-width: 760px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  transition: border-color 0.25s ease;
}
.arch-info-panel.active { border-color: var(--accent); }
.arch-info-placeholder {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--mono);
}
.arch-info-title {
  font-size: 0.72rem;
  font-family: var(--mono);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.arch-info-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}