@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700&family=Raleway:wght@300;400;500;600;700;800&family=Poppins:wght@300;400;500;600;700&display=swap');

/* ── Variables ───────────────────────────────────────────────────────────── */
:root {
  --sidebar-width: 300px;
  --sidebar-bg: #040b14;
  --accent: #149ddd;
  --accent-hover: #37b3ed;
  --nav-text: #a8a9b4;
  --heading-blue: #173b6c;
  --text: #444444;
  --text-light: #666;
  --section-alt: #f5f8fd;
  --border: #e8e8e8;
  --white: #fff;
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Open Sans', sans-serif;
  color: var(--text);
  background: var(--white);
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; }

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
#sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100%;
  background: var(--sidebar-bg);
  overflow-y: auto;
  z-index: 9999;
  transition: left 0.3s ease;
}

.sidebar-inner {
  padding: 40px 20px 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100%;
}

.profile-img-wrap {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
  border: 8px solid rgba(255,255,255,0.1);
  margin-bottom: 16px;
  background: #1a2a3a;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.profile-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.profile-initials {
  font-family: 'Raleway', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.sidebar-name {
  font-family: 'Raleway', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  text-align: center;
  margin-bottom: 14px;
}
.sidebar-name a { color: var(--white); }
.sidebar-name a:hover { color: var(--accent); }

.social-links {
  display: flex;
  gap: 10px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  justify-content: center;
}
.social-links a {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--nav-text);
  font-size: 0.85rem;
  transition: all 0.2s;
}
.social-links a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}
.social-links a i { font-size: 0.8rem; }

/* ── Sidebar Nav ─────────────────────────────────────────────────────────── */
#sidebar-nav {
  width: 100%;
}
#sidebar-nav ul {
  list-style: none;
  width: 100%;
}
#sidebar-nav ul li {
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
#sidebar-nav ul li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  color: var(--nav-text);
  font-family: 'Poppins', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: color 0.2s, padding 0.2s;
  border-left: 3px solid transparent;
}
#sidebar-nav ul li a:hover,
#sidebar-nav ul li a.active {
  color: var(--white);
  border-left-color: var(--accent);
  padding-left: 20px;
}
#sidebar-nav ul li a i {
  font-size: 0.9rem;
  min-width: 16px;
  color: var(--accent);
}

/* ── Mobile toggle ───────────────────────────────────────────────────────── */
#mobile-nav-toggle {
  display: none;
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10000;
  background: var(--accent);
  color: var(--white);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1.1rem;
  align-items: center;
  justify-content: center;
}

/* ── Main ────────────────────────────────────────────────────────────────── */
#main {
  margin-left: var(--sidebar-width);
}

/* ── Section base ────────────────────────────────────────────────────────── */
section {
  padding: 80px 0;
  overflow: hidden;
}
section.section-alt {
  background: var(--section-alt);
}

.section-title {
  font-family: 'Raleway', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--heading-blue);
  padding-bottom: 20px;
  margin-bottom: 40px;
  position: relative;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--accent);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ── Hero ────────────────────────────────────────────────────────────────── */
#hero {
  width: 100%;
  min-height: 100vh;
  background: url('/assets/img/hero-banner.png') center center / cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 24px;
  position: relative;
  overflow: hidden;
}
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(4, 11, 20, 0.7);
}
.hero-content { position: relative; z-index: 1; }
.hero-content h1 {
  font-family: 'Raleway', sans-serif;
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.hero-content p {
  font-family: 'Poppins', sans-serif;
  font-size: 1.2rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 8px;
}
.hero-typing {
  font-family: 'Poppins', sans-serif;
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 10px;
}
.cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent);
  animation: blink 1s step-end infinite;
  vertical-align: middle;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* ── About ───────────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 60px;
  align-items: center;
}
.about-img-wrap {
  border-radius: 8px;
  overflow: hidden;
  background: #e8f4fb;
  aspect-ratio: 3/4;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.about-img-placeholder {
  font-family: 'Raleway', sans-serif;
  font-size: 5rem;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.3;
}
.about-text h3 {
  font-family: 'Raleway', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--heading-blue);
  margin-bottom: 8px;
}
.about-text .role {
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-family: 'Poppins', sans-serif;
}
.about-text p {
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}
.about-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 20px;
  margin: 24px 0;
}
.about-details li {
  list-style: none;
  font-size: 0.9rem;
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.about-details li strong {
  color: var(--heading-blue);
  margin-right: 6px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
  text-align: center;
}
.stat-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.stat-card .stat-num {
  font-family: 'Raleway', sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-card p {
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

/* ── Skills ──────────────────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 60px;
}
.skills-group h3 {
  font-family: 'Raleway', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--heading-blue);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.skill {
  margin-bottom: 18px;
}
.skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--heading-blue);
}
.skill-bar {
  height: 10px;
  background: #e0eaf3;
  border-radius: 5px;
  overflow: hidden;
}
.skill-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 5px;
  width: 0;
  transition: width 1s ease 0.3s;
}

/* ── Resume ──────────────────────────────────────────────────────────────── */
.resume-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 60px;
}
.resume-col h3 {
  font-family: 'Raleway', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--heading-blue);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.resume-col h3 i { color: var(--accent); }
.timeline { position: relative; padding-left: 24px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: #d9e8f5;
}
.timeline-item {
  position: relative;
  margin-bottom: 28px;
  padding-left: 12px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--accent);
}
.timeline-date {
  display: inline-block;
  background: #e8f4fb;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 8px;
  font-family: 'Poppins', sans-serif;
  letter-spacing: 0.03em;
}
.timeline-item h4 {
  font-family: 'Raleway', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--heading-blue);
  margin-bottom: 4px;
}
.timeline-item .company {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}
.timeline-item p {
  font-size: 0.875rem;
  color: var(--text-light);
  line-height: 1.7;
}
.timeline-item ul {
  margin: 6px 0 0 2px;
  padding-left: 16px;
  list-style: none;
}
.timeline-item ul li {
  position: relative;
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
  padding: 2px 0;
  padding-left: 12px;
}
.timeline-item ul li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ── Blog preview ────────────────────────────────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}
.blog-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.blog-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  border-color: var(--accent);
}
.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.78rem;
  color: #999;
}
.blog-card-meta .tag {
  background: #e8f4fb;
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.blog-card h3 {
  font-family: 'Raleway', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--heading-blue);
  margin-bottom: 10px;
  line-height: 1.4;
}
.blog-card h3 a { color: inherit; }
.blog-card h3 a:hover { color: var(--accent); }
.blog-card p {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 16px;
}
.blog-read-more {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.blog-read-more::after { content: ' →'; }
.all-posts-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: var(--white);
  padding: 12px 28px;
  border-radius: 4px;
  font-family: 'Poppins', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  transition: background 0.2s;
}
.all-posts-btn:hover { background: var(--accent-hover); color: var(--white); }

/* ── Portfolio ───────────────────────────────────────────────────────────── */
.portfolio-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.filter-btn {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 18px;
  border-radius: 4px;
  font-family: 'Poppins', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.portfolio-item {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: box-shadow 0.2s;
}
.portfolio-item:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.1); }
.portfolio-item.hidden { display: none; }
.portfolio-thumb {
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.portfolio-thumb .thumb-icon {
  font-size: 3rem;
  opacity: 0.5;
  color: var(--white);
}
.portfolio-overlay {
  position: absolute;
  inset: 0;
  background: rgba(20, 157, 221, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
}
.portfolio-item:hover .portfolio-overlay { opacity: 1; }
.portfolio-overlay a {
  color: var(--white);
  font-size: 1.4rem;
  margin: 0 8px;
  transition: transform 0.2s;
}
.portfolio-overlay a:hover { transform: scale(1.2); }
.portfolio-info {
  padding: 18px;
  background: var(--white);
}
.portfolio-info h4 {
  font-family: 'Raleway', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--heading-blue);
  margin-bottom: 4px;
}
.portfolio-info span {
  font-size: 0.78rem;
  color: var(--text-light);
}
.lang-badge {
  display: inline-block;
  background: #e8f4fb;
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  margin-right: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Thumb color variants ────────────────────────────────────────────────── */
.thumb-java   { background: linear-gradient(135deg, #1f4068, #1b262c); }
.thumb-cpp    { background: linear-gradient(135deg, #0f3460, #16213e); }
.thumb-python { background: linear-gradient(135deg, #1a3a52, #0d2137); }
.thumb-web    { background: linear-gradient(135deg, #005c97, #363795); }
.thumb-shell  { background: linear-gradient(135deg, #134e5e, #71b280); }
.thumb-java2  { background: linear-gradient(135deg, #373b44, #4286f4); }

/* ── Back to top ─────────────────────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 40px;
  height: 40px;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
  transition: background 0.2s;
}
#back-to-top:hover { background: var(--accent-hover); }
#back-to-top.visible { display: flex; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 1199px) {
  #sidebar { left: calc(-1 * var(--sidebar-width)); }
  #sidebar.open { left: 0; box-shadow: 4px 0 20px rgba(0,0,0,0.4); }
  #main { margin-left: 0; }
  #mobile-nav-toggle { display: flex; }
}
@media (max-width: 900px) {
  .about-grid, .resume-grid { grid-template-columns: 1fr; }
  .about-img-wrap { aspect-ratio: 1/1; max-width: 240px; margin: 0 auto; }
  .skills-grid { grid-template-columns: 1fr; gap: 28px; }
  .blog-grid, .portfolio-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .hero-content h1 { font-size: 2.5rem; }
}
@media (max-width: 600px) {
  .blog-grid, .portfolio-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .about-details { grid-template-columns: 1fr; }
  section { padding: 56px 0; }
  .container { padding: 0 20px; }
  .hero-content h1 { font-size: 2rem; }
}