/* ============================================
   CYBERESIST Portfolio — Dark Elegant Theme
   ============================================ */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #161616;
  --bg-card-hover: #1c1c1c;
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.1);
  --text-primary: #e8e4de;
  --text-secondary: #9a9590;
  --text-muted: #5a5550;
  --accent: #c9a96e;
  --accent-dim: rgba(201, 169, 110, 0.15);
  --accent-glow: rgba(201, 169, 110, 0.08);
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Plus Jakarta Sans', system-ui, sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--text-primary);
}

img {
  max-width: 100%;
  display: block;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.4rem;
}

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.page-content {
  padding-top: calc(var(--nav-height) + 4rem);
  padding-bottom: 6rem;
  min-height: 100vh;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background var(--transition);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  transition: all var(--transition);
}

/* --- Hero Section (index) --- */
.hero {
  padding-top: calc(var(--nav-height) + 8rem);
  padding-bottom: 8rem;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.hero-text {
  max-width: 560px;
}

.hero-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-label::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.hero h1 em {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--accent);
}

.hero-description {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-avatar {
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  color: var(--text-muted);
  position: relative;
  overflow: hidden;
}

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

.hero-avatar::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 1px solid var(--accent-dim);
  pointer-events: none;
}

/* Decorative orbit ring */
.hero-visual::before {
  content: '';
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 1px dashed var(--border-subtle);
  animation: orbit-spin 60s linear infinite;
}

@keyframes orbit-spin {
  to { transform: rotate(360deg); }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: #d4b578;
  color: var(--bg-primary);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- Section Headers --- */
.section-header {
  margin-bottom: 4rem;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.05rem;
}

/* --- Stats Row --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  margin: 4rem 0;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--text-primary);
  display: block;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

/* --- Cards Grid --- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  border-color: var(--border-medium);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
}

.card h3 {
  margin-bottom: 0.75rem;
}

.card p {
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  background: rgba(201, 169, 110, 0.08);
  color: var(--accent);
  border: 1px solid rgba(201, 169, 110, 0.15);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: 0.5rem;
}

.card-link:hover {
  gap: 0.7rem;
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: 3rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-subtle);
}

.timeline-item {
  position: relative;
  padding-bottom: 3.5rem;
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: -3rem;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-date {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.timeline-item h3 {
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.timeline-item p {
  font-size: 0.92rem;
}

/* --- Book Section --- */
.book-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 4rem;
  align-items: start;
}

.book-cover {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 2/3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

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

.book-cover-placeholder {
  text-align: center;
  padding: 2rem;
}

.book-cover-placeholder .book-emoji {
  font-size: 4rem;
  display: block;
  margin-bottom: 1.5rem;
}

.book-cover-placeholder .book-title-placeholder {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--text-primary);
  line-height: 1.3;
}

.book-details h2 {
  margin-bottom: 0.5rem;
}

.book-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.book-description {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.book-highlights {
  list-style: none;
  margin-bottom: 2.5rem;
}

.book-highlights li {
  padding: 0.6rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.book-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* --- Blog / Articles --- */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.article-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition);
}

.article-item:hover {
  padding-left: 1rem;
}

.article-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.04em;
  min-width: 100px;
}

.article-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text-primary);
  transition: color var(--transition);
}

.article-item:hover .article-title {
  color: var(--accent);
}

.article-arrow {
  color: var(--text-muted);
  transition: all var(--transition);
  font-size: 1.2rem;
}

.article-item:hover .article-arrow {
  color: var(--accent);
  transform: translateX(4px);
}

/* --- Skills / Certifications --- */
.skills-section {
  margin-bottom: 4rem;
}

.skills-section h3 {
  margin-bottom: 1.5rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  font-size: 0.85rem;
  font-weight: 400;
  padding: 0.5rem 1.1rem;
  border-radius: 100px;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition);
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.cert-item:hover {
  border-color: var(--border-medium);
}

.cert-badge {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.cert-info h4 {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.cert-info span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --- Contact Form --- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
}

.contact-item h4 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.contact-item p {
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  transition: all var(--transition);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 0;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent);
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger.visible > *:nth-child(1) { transition-delay: 0.05s; }
.stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger.visible > *:nth-child(3) { transition-delay: 0.15s; }
.stagger.visible > *:nth-child(4) { transition-delay: 0.2s; }
.stagger.visible > *:nth-child(5) { transition-delay: 0.25s; }
.stagger.visible > *:nth-child(6) { transition-delay: 0.3s; }

.stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }

  .hero-label {
    justify-content: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual::before {
    width: 320px;
    height: 320px;
  }

  .hero-avatar {
    width: 240px;
    height: 240px;
    font-size: 4rem;
  }

  .book-layout {
    grid-template-columns: 220px 1fr;
    gap: 2.5rem;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 10, 0.98);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  .hero {
    padding-top: calc(var(--nav-height) + 4rem);
    padding-bottom: 4rem;
  }

  .hero p {
    max-width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .book-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .book-cover {
    max-width: 220px;
    margin: 0 auto;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .article-item {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .article-arrow {
    display: none;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .certs-grid {
    grid-template-columns: 1fr;
  }

  .footer .container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}