/* ================================================================
   TRUONG NGUYEN BAO — Personal Portfolio
   Theme: Mechanical / Industrial Dark
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Space+Grotesk:wght@400;600;700&display=swap');

/* ── Variables ─────────────────────────────────────────────────── */
:root {
  --bg:         #0a0a0c;
  --bg-card:    #111114;
  --bg-card2:   #16161a;
  --text:       #d1d1d1;
  --muted:      #6a6a6a;
  --primary:    #00ff9d;
  --accent:     #ff3e3e;
  --border:     #2a2a2e;
  --font-mono:  'JetBrains Mono', monospace;
  --font-sans:  'Space Grotesk', sans-serif;
  --ease-step:  steps(4, end);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --glow:       0 0 20px rgba(0, 255, 157, 0.25);
  --glow-soft:  0 0 10px rgba(0, 255, 157, 0.1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-mono);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* CRT scanline overlay */
body::before {
  content: "";
  display: block;
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.22) 50%),
    linear-gradient(90deg, rgba(255,0,0,0.05), rgba(0,255,0,0.02), rgba(0,0,255,0.05));
  background-size: 100% 4px, 3px 100%;
  z-index: 2000;
  pointer-events: none;
  opacity: 0.25;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.1s var(--ease-step);
}
a:hover {
  background: var(--primary);
  color: var(--bg);
  box-shadow: var(--glow);
}

/* ── Navigation ────────────────────────────────────────────────── */
nav {
  border-bottom: 2px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  background: rgba(10, 10, 12, 0.92);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.nav-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--primary);
  letter-spacing: 2px;
}
.logo::before { content: "[ "; }
.logo::after  { content: " ]"; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}
.nav-links a {
  color: var(--text);
  font-size: 0.78rem;
  text-transform: uppercase;
  padding: 4px 8px;
  border: 1px solid transparent;
  letter-spacing: 1px;
}
.nav-links a:hover,
.nav-links a.active {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
  box-shadow: none;
}

/* ── Layout ─────────────────────────────────────────────────────── */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 5rem 0;
  border-bottom: 1px dashed var(--border);
}

/* ── Section Headers ────────────────────────────────────────────── */
.section-header {
  margin-bottom: 3rem;
}
.section-header h2 {
  font-family: var(--font-sans);
  font-size: 2rem;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.section-header h2::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 20px;
  background: var(--primary);
  flex-shrink: 0;
}
.secondary-header {
  margin-top: 4rem;
  margin-bottom: 2rem;
}

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 0;
  border: none;
  transition: all 0.1s var(--ease-step);
  letter-spacing: 1px;
}
.btn-primary {
  background: var(--primary);
  color: var(--bg);
}
.btn-primary:hover {
  background: var(--bg);
  color: var(--primary);
  outline: 2px solid var(--primary);
  box-shadow: var(--glow);
}
.btn-secondary {
  background: transparent;
  color: var(--text);
  outline: 1px solid var(--border);
}
.btn-secondary:hover {
  outline-color: var(--primary);
  color: var(--primary);
  background: transparent;
  box-shadow: none;
}

/* ── Hero Section ───────────────────────────────────────────────── */
.hero-section {
  text-align: center;
  position: relative;
}

.profile-frame {
  width: 160px;
  height: 160px;
  margin: 0 auto 2rem;
  border: 4px solid var(--border);
  position: relative;
  overflow: hidden;
  clip-path: polygon(10% 0, 100% 0, 100% 90%, 90% 100%, 0 100%, 0 10%);
}
.profile-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent, var(--primary));
  opacity: 0.08;
  animation: scan 3s linear infinite;
}
@keyframes scan {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

.profile-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-section h1 {
  font-family: var(--font-sans);
  font-size: 2.6rem;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: -1px;
}

.tw-wrap {
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 2.5rem;
  display: flex;
  justify-content: center;
}
.static-roles {
  text-align: left;
  line-height: 1.8;
  font-family: var(--font-mono);
  border-left: 2px solid var(--primary);
  padding: 0.6rem 1rem;
  background: rgba(0, 255, 157, 0.04);
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── About Section ──────────────────────────────────────────────── */
.about-content p {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 3rem;
  max-width: 600px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
}
.stat-item {
  background: var(--bg-card);
  padding: 2rem;
  border: 1px solid var(--border);
  position: relative;
  transition: border-color 0.2s var(--ease-smooth);
}
.stat-item:hover { border-color: var(--primary); }
.stat-item::before {
  content: "DATA_ID: " attr(data-id);
  position: absolute;
  top: 6px; left: 10px;
  font-size: 0.58rem;
  color: var(--muted);
  letter-spacing: 1px;
}
.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 10px;
}
.stat-label {
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ── Featured Project ───────────────────────────────────────────── */
.featured-project-container {
  margin-bottom: 1rem;
}

.featured-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-card2) 0%, var(--bg-card) 100%);
  border: 2px solid var(--primary);
  padding: 3rem;
  box-shadow: var(--glow);
  transition: box-shadow 0.3s var(--ease-smooth);
}
.featured-card:hover {
  box-shadow: 0 0 40px rgba(0, 255, 157, 0.35);
}

/* Corner decoration */
.featured-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 60px; height: 60px;
  border-top: 2px solid var(--primary);
  border-left: 2px solid var(--primary);
  opacity: 0.5;
}
.featured-card::after {
  content: "";
  position: absolute;
  bottom: 0; right: 0;
  width: 60px; height: 60px;
  border-bottom: 2px solid var(--primary);
  border-right: 2px solid var(--primary);
  opacity: 0.5;
}

.featured-badge {
  position: absolute;
  top: 0; right: 0;
  background: var(--primary);
  color: var(--bg);
  padding: 5px 18px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.featured-content {
  display: flex;
  gap: 3rem;
  align-items: center;
}

.featured-text { flex: 1; }
.featured-text h3 {
  font-family: var(--font-sans);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
  letter-spacing: -1px;
}
.featured-desc {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.architecture-list {
  list-style: none;
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
}
.architecture-list li {
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0.5rem;
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}
.architecture-list li:hover { border-color: var(--primary); color: var(--text); }
.architecture-list li span {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.85rem;
}

.featured-tech { margin-bottom: 2rem; }

.project-tech {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.tech-tag {
  background: rgba(0, 255, 157, 0.08);
  color: var(--primary);
  padding: 3px 10px;
  font-size: 0.68rem;
  border: 1px solid rgba(0, 255, 157, 0.2);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.featured-btn { margin-top: 0.5rem; }

/* ── Cloud Animation ────────────────────────────────────────────── */
.featured-visual {
  flex: 0 0 240px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.cloud-icon-animation {
  position: relative;
  width: 200px;
  height: 200px;
}

.center-glow {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 64px; height: 64px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  animation: pulseGlow 2s ease-in-out infinite alternate;
  border-radius: 50%;
}

.center-label {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--bg);
  letter-spacing: 2px;
  z-index: 1;
}

@keyframes pulseGlow {
  from { opacity: 0.4; transform: translate(-50%, -50%) scale(0.85); }
  to   { opacity: 0.8; transform: translate(-50%, -50%) scale(1.15); }
}

.server-node {
  position: absolute;
  width: 14px; height: 14px;
  background: var(--primary);
  border-radius: 2px;
  box-shadow: 0 0 12px var(--primary);
  top: 50%; left: 50%;
}

/* Each node orbits at a different speed/phase */
.node-c1 { animation: orbit 8s linear infinite; }
.node-c2 { animation: orbit 11s linear infinite; animation-delay: -2s; }
.node-c3 { animation: orbit 14s linear infinite; animation-delay: -5s; }
.node-c6 { animation: orbit 17s linear infinite reverse; animation-delay: -1s; }
.node-c9 { animation: orbit 20s linear infinite reverse; animation-delay: -8s; }

@keyframes orbit {
  from { transform: rotate(0deg) translateX(82px) rotate(0deg); }
  to   { transform: rotate(360deg) translateX(82px) rotate(-360deg); }
}

/* ── Other Projects Grid ────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.8rem;
  position: relative;
  transition: border-color 0.15s var(--ease-step), box-shadow 0.15s;
}
.project-card:hover {
  border-color: var(--primary);
  box-shadow: var(--glow-soft);
}
/* corner cut */
.project-card::after {
  content: "";
  position: absolute;
  bottom: 0; right: 0;
  border-style: solid;
  border-width: 0 0 14px 14px;
  border-color: transparent transparent var(--border) transparent;
  transition: border-color 0.15s;
}
.project-card:hover::after {
  border-color: transparent transparent var(--primary) transparent;
}

.project-card h3 {
  margin-bottom: 0.75rem;
  color: var(--primary);
  font-size: 1rem;
}
.project-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
  min-height: 3.5em;
}

.project-link {
  display: inline-block;
  font-size: 0.75rem;
  margin-top: 1rem;
  padding: 4px 12px;
  border: 1px solid var(--primary);
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.project-link:hover {
  background: var(--primary);
  color: var(--bg);
}

/* ── Footer ─────────────────────────────────────────────────────── */
footer {
  padding: 4rem 20px;
  background: #050507;
  text-align: center;
  border-top: 2px solid var(--border);
  transition: border-top-color 0.3s, box-shadow 0.3s;
}
footer.active-glow {
  border-top-color: var(--primary);
  box-shadow: 0 -20px 40px rgba(0, 255, 157, 0.08);
}
footer p { color: var(--muted); font-size: 0.85rem; margin-bottom: 1.5rem; }

.social-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.social-links a {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: 1px solid var(--border);
  padding: 8px 18px;
}

/* ── AI Chatbot Widget ──────────────────────────────────────────── */
#ai-chatbot-widget {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 1000;
}

#chatbot-toggle {
  background: var(--bg-card);
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 11px 20px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.78rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: all 0.1s var(--ease-step);
}
#chatbot-toggle:hover {
  background: var(--primary);
  color: var(--bg);
  box-shadow: var(--glow);
}

#chatbot-window {
  width: 360px;
  background: var(--bg);
  border: 2px solid var(--primary);
  position: absolute;
  bottom: 60px;
  right: 0;
  display: flex;
  flex-direction: column;
  box-shadow: var(--glow);
}

.chatbot-header {
  padding: 10px 14px;
  background: var(--primary);
  color: var(--bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.chatbot-header h3 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
}
#chatbot-close {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  color: var(--bg);
  line-height: 1;
  padding: 2px 6px;
}
#chatbot-close:hover { opacity: 0.7; }

#chatbot-messages {
  height: 320px;
  padding: 14px;
  overflow-y: auto;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message {
  padding: 10px 12px;
  font-size: 0.82rem;
  line-height: 1.6;
  max-width: 88%;
  word-break: break-word;
}
.bot-message {
  border-left: 3px solid var(--primary);
  background: rgba(0, 255, 157, 0.05);
  align-self: flex-start;
}
.user-message {
  border-right: 3px solid var(--muted);
  background: rgba(255, 255, 255, 0.04);
  align-self: flex-end;
  text-align: right;
}

.chatbot-input-area {
  padding: 10px;
  display: flex;
  gap: 8px;
}
#chatbot-input {
  flex: 1;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.1s;
}
#chatbot-input:focus { border-color: var(--primary); }
#chatbot-send {
  background: var(--primary);
  color: var(--bg);
  border: none;
  padding: 0 16px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  transition: opacity 0.1s;
}
#chatbot-send:hover { opacity: 0.85; }

/* ── Utilities ──────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .featured-content {
    flex-direction: column;
    gap: 2rem;
  }
  .featured-text h3 { font-size: 2rem; }
  .featured-visual { order: -1; }
  .featured-card { padding: 2rem 1.5rem; }
}

@media (max-width: 768px) {
  .hero-section h1 { font-size: 1.8rem; }
  .nav-links { display: none; }
  #chatbot-window { width: calc(100vw - 40px); right: -8px; }
  .projects-grid { grid-template-columns: 1fr; }
}