/*-------------------------
    Variables - Modern palette
-------------------------*/
:root {
  --pb-primary: #2563eb;
  --pb-primary-dark: #1d4ed8;
  --pb-primary-light: #dbeafe;
  --pb-dark: #0f172a;
  --pb-dark-lighter: #1e293b;
  --pb-link: #2563eb;
  --pb-text: #1e293b;
  --pb-text-muted: #64748b;
  --pb-bg-light: #f8fafc;
  --pb-white: #ffffff;
  --pb-border: #e2e8f0;
  --pb-accent: #06b6d4;
}

/*-------------------------
    Base
-------------------------*/
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--pb-text);
  background: var(--pb-bg-light);
  padding-top: 70px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--pb-link);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--pb-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

/*-------------------------
    Navbar - Frosted glass
-------------------------*/
.navbar {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
.navbar-brand {
  padding: 0;
}
.logo-main {
  height: 32px;
  width: auto;
}
.navbar .nav-link {
  color: var(--pb-text) !important;
  font-weight: 500;
  margin-left: 1.25rem;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
  position: relative;
}
.navbar .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--pb-primary);
  transition: all 0.2s ease;
  transform: translateX(-50%);
}
.navbar .nav-link:hover::after,
.navbar .nav-link.active::after {
  width: 100%;
}
.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--pb-primary) !important;
}

/*-------------------------
    Hero - Modern gradient with subtle mesh
-------------------------*/
.hero {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6,182,212,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(37,99,235,0.1) 0%, transparent 50%),
    linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  padding: 6rem 0 5rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Ccircle cx='30' cy='30' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}
.hero h1 {
  font-size: 3.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.hero h1 span {
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .lead {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.65);
  max-width: 560px;
  line-height: 1.7;
  letter-spacing: -0.01em;
}
.hero-photo {
  width: 260px;
  height: 260px;
  border-radius: 24px;
  object-fit: cover;
  border: 3px solid rgba(255,255,255,0.1);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.hero .btn-primary {
  padding: 0.65rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
}
.hero .btn-outline-light {
  border-color: rgba(255,255,255,0.2);
  padding: 0.65rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
}
.hero .btn-outline-light:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.4);
}

/*-------------------------
    Buttons
-------------------------*/
.btn-primary {
  background: var(--pb-primary);
  border-color: var(--pb-primary);
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.15s ease;
}
.btn-primary:hover {
  background: var(--pb-primary-dark);
  border-color: var(--pb-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.btn-outline-primary {
  color: var(--pb-primary);
  border-color: var(--pb-border);
  border-radius: 10px;
  font-weight: 500;
}
.btn-outline-primary:hover,
.btn-outline-primary.active {
  background: var(--pb-primary);
  border-color: var(--pb-primary);
  color: #fff;
  transform: translateY(-1px);
}

/*-------------------------
    Sections
-------------------------*/
.section {
  padding: 5rem 0;
}
.section-light {
  background: var(--pb-bg-light);
}
.section-white {
  background: var(--pb-white);
}
.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}
.section-subtitle {
  color: var(--pb-text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

/*-------------------------
    Project Cards - Glass effect
-------------------------*/
.project-card {
  border: 1px solid var(--pb-border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all 0.25s ease;
  height: 100%;
  background: var(--pb-white);
  position: relative;
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--pb-primary), var(--pb-accent));
  opacity: 0;
  transition: opacity 0.25s ease;
}
.project-card:hover {
  border-color: transparent;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  transform: translateY(-4px);
}
.project-card:hover::before {
  opacity: 1;
}
.project-card .icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--pb-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 1.35rem;
  color: var(--pb-primary);
  transition: all 0.25s ease;
}
.project-card:hover .icon-wrap {
  background: var(--pb-primary);
  color: #fff;
  transform: scale(1.05);
}
.project-card h5 {
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.project-card p {
  color: var(--pb-text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}
.project-card .project-link {
  color: var(--pb-primary);
  font-weight: 600;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}
.project-card .project-link:hover {
  color: var(--pb-primary-dark);
  gap: 0.5rem;
}
.project-card .project-link i {
  transition: transform 0.2s ease;
}
.project-card:hover .project-link i {
  transform: translateX(3px);
}

/*-------------------------
    Project Card Large
-------------------------*/
.project-card-lg {
  text-align: left;
  padding: 2rem;
}
.project-card-lg .icon-wrap {
  margin: 0 0 1rem;
}
.project-card-lg p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/*-------------------------
    Page Content
-------------------------*/
.page-content {
  padding: 2.5rem 0;
}
.page-content p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}
.page-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.page-content h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.page-content h4 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}
.page-content ul {
  margin-bottom: 1.25rem;
}
.page-content ul li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}
.page-content hr {
  margin: 2.5rem 0;
  border-color: var(--pb-border);
}

.contact-form .form-control {
  border-radius: 10px;
}
.contact-form .form-label {
  font-weight: 600;
  font-size: 0.9rem;
}

.page-header p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 0;
}

/*-------------------------
    Article List Hero
-------------------------*/
.article-list-hero {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6,182,212,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(37,99,235,0.1) 0%, transparent 50%),
    linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  padding: 3.5rem 0;
}
.article-list-hero h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.article-list-hero p {
  color: rgba(255,255,255,0.6);
}
.article-list-hero .search-wrap .form-control {
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.08);
  color: #fff;
  border-radius: 10px;
}
.article-list-hero .search-wrap .form-control::placeholder {
  color: rgba(255,255,255,0.4);
}
.article-list-hero .search-wrap .form-control:focus {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.3);
  color: #fff;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.2);
}

.category-filter {
  margin-bottom: 2rem;
}
.category-filter .btn {
  margin: 0.25rem;
  font-size: 0.85rem;
  border-radius: 20px;
  padding: 0.35rem 1rem;
}

.article-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--pb-border);
}
.article-item:last-child {
  border-bottom: none;
}
.article-item h5 {
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.article-item h5 a {
  color: var(--pb-text);
}
.article-item h5 a:hover {
  color: var(--pb-primary);
}
.article-meta {
  font-size: 0.85rem;
  color: var(--pb-text-muted);
}
.article-meta .badge {
  background: var(--pb-primary);
  font-weight: 500;
  font-size: 0.75rem;
  border-radius: 6px;
}
.article-excerpt {
  color: var(--pb-text-muted);
  font-size: 0.95rem;
  margin-top: 0.35rem;
}

/*-------------------------
    Single Article
-------------------------*/
.article-header {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6,182,212,0.15) 0%, transparent 50%),
    linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  padding: 3.5rem 0;
}
.article-header-inner {
  max-width: 760px;
}
.article-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.article-header p {
  color: rgba(255,255,255,0.6);
  margin-bottom: 0;
}
.article-header .badge {
  background: rgba(37,99,235,0.3);
  color: #93c5fd;
  font-weight: 500;
  border-radius: 6px;
}
.article-header span {
  color: rgba(255,255,255,0.6);
}

/* Article content typography */
.article-body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 18px;
  line-height: 1.75;
  color: var(--pb-text);
  padding: 40px 0;
}
.article-body > *:first-child {
  margin-top: 0 !important;
}
.article-body > *:last-child {
  margin-bottom: 0 !important;
}
.article-body p {
  margin: 0 0 1.25rem;
  font-size: 18px;
}
.article-body h1,
.article-body h2,
.article-body h3 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--pb-dark);
  letter-spacing: -0.02em;
}
.article-body h1 {
  margin: 0 0 0.75rem;
  font-size: 2rem;
}
.article-body h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.5rem;
}
.article-body h3 {
  margin: 1.5rem 0 0.6rem;
  font-size: 1.25rem;
}
.article-body h3 + pre,
.article-body h3 + table,
.article-body h3 + ul {
  margin-top: 0.4rem;
}
.article-body ul,
.article-body ol {
  margin-left: 1rem;
  margin-bottom: 1.5em;
}
.article-body li {
  margin-bottom: 0.5em;
  list-style-type: disc;
}
.article-body blockquote {
  border-left: 3px solid var(--pb-primary);
  padding: 1.25rem 1.5rem;
  color: var(--pb-text-muted);
  font-style: italic;
  margin: 2em 0;
  background: var(--pb-bg-light);
  border-radius: 0 12px 12px 0;
}
.article-body blockquote p:last-child {
  margin-bottom: 0;
}
.article-body a {
  color: var(--pb-primary);
  text-decoration: underline;
  text-decoration-color: rgba(37,99,235,0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.15s ease;
}
.article-body a:hover {
  color: var(--pb-primary-dark);
  text-decoration-color: var(--pb-primary-dark);
}
.article-body img {
  max-width: 100%;
  height: auto;
  margin: 24px 0;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
/* Tables */
.article-body table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.5rem 0;
  font-size: 15px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--pb-border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.article-body th,
.article-body td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--pb-border);
}
.article-body th {
  background: var(--pb-dark);
  color: #fff;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.article-body tr:last-child td {
  border-bottom: none;
}
.article-body tr:nth-child(even) td {
  background: var(--pb-bg-light);
}
.article-body tr:hover td {
  background: var(--pb-primary-light);
  transition: background 0.15s ease;
}
/* Code blocks */
.article-body pre {
  background: var(--pb-dark);
  color: #e2e8f0;
  border: none;
  border-radius: 12px;
  padding: 18px 20px;
  margin: 1.25rem 0 1.5rem;
  overflow: auto;
  line-height: 1.6;
  font-size: 14px;
}
.article-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
  font-size: 14px;
  background: var(--pb-primary-light);
  color: var(--pb-primary-dark);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
}
.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
}
@media (min-width: 992px) {
  .article-body {
    padding: 24px 0 40px;
    padding-right: 24px;
  }
}

.article-nav {
  padding: 1.5rem 0 3rem;
}
.article-nav a {
  color: var(--pb-primary);
  font-weight: 600;
}

/*-------------------------
    Sidebar
-------------------------*/
.sidebar {
  padding: 2.5rem 0 2.5rem 2rem;
}
.sidebar-section {
  margin-bottom: 2rem;
  background: var(--pb-white);
  border: 1px solid var(--pb-border);
  border-radius: 16px;
  padding: 1.5rem;
}
.sidebar-section h5 {
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--pb-primary);
  color: var(--pb-text-muted);
}

.project-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.project-links li {
  margin-bottom: 0.35rem;
}
.project-links li a {
  display: block;
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  color: var(--pb-text);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.15s ease;
}
.project-links li a:hover {
  background: var(--pb-primary-light);
  color: var(--pb-primary);
}
.project-links li a i {
  color: var(--pb-primary);
  margin-right: 0.5rem;
  font-size: 1rem;
}
.project-links li a span {
  display: block;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--pb-text-muted);
  margin-top: 0.15rem;
  padding-left: 1.5rem;
}

.category-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.category-links li {
  margin-bottom: 0.25rem;
}
.category-links li a {
  display: block;
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  color: var(--pb-text);
  font-size: 0.9rem;
  transition: all 0.15s ease;
}
.category-links li a:hover {
  background: var(--pb-primary-light);
  color: var(--pb-primary);
}

/*-------------------------
    Footer
-------------------------*/
footer {
  background: var(--pb-dark);
  color: rgba(255,255,255,0.5);
  padding: 4rem 0 2rem;
  margin-top: 0;
}
footer h5,
footer h6 {
  color: #fff;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.footer-brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: none;
}
footer a {
  color: rgba(255,255,255,0.6);
  transition: color 0.15s ease;
}
footer a:hover {
  color: #fff;
}
footer hr {
  border-color: rgba(255,255,255,0.08);
}
.footer-links li {
  margin-bottom: 0.5rem;
}
.footer-links a {
  font-size: 0.9rem;
}
.social-links a {
  font-size: 1.25rem;
  margin-right: 1rem;
  color: rgba(255,255,255,0.5);
}
.social-links a:hover {
  color: var(--pb-primary);
}
.copyright {
  font-size: 0.85rem;
  margin-bottom: 0;
}

/*-------------------------
    About Page
-------------------------*/
.page-header {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6,182,212,0.15) 0%, transparent 50%),
    linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  padding: 3.5rem 0;
}
.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.page-content {
  background: var(--pb-white);
  padding: 3rem 0;
}
.page-content p {
  font-size: 1.05rem;
  line-height: 1.8;
}

/*-------------------------
    Homepage Latest Articles
-------------------------*/
.latest-articles {
  background: var(--pb-white);
  padding: 5rem 0;
}

/* Article cards */
.article-box {
  background: #fff;
  border: 1px solid var(--pb-border);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  height: calc(100% - 24px);
  margin-bottom: 24px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: all 0.25s ease;
}
.article-box:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.08);
  border-color: transparent;
}
.article-box .a-body {
  padding: 20px 20px 12px;
}
.article-box .a-body .date {
  font-size: 13px;
  color: var(--pb-text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}
.article-box .a-body a.title {
  text-decoration: none;
}
.article-box .a-body a.title h5 {
  margin: 0 0 8px;
  color: var(--pb-dark);
  line-height: 1.35;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: calc(1.35em * 2);
}
.article-box .a-body a.title:hover h5 {
  color: var(--pb-primary);
}
.article-box .a-body p {
  margin: 0;
  color: var(--pb-text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-box .a-footer {
  margin-top: auto;
  padding: 14px 20px;
  border-top: 1px solid var(--pb-border);
  font-size: 14px;
  color: var(--pb-text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.article-box .a-footer .badge-cat {
  background-color: var(--pb-primary-light);
  color: var(--pb-primary);
  border-radius: 6px;
  padding: 4px 10px;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.01em;
}
.article-box .a-footer .btn-readmore {
  background: none;
  color: var(--pb-text-muted);
  border: none;
  padding: 0;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.article-box .a-footer .btn-readmore:hover {
  color: var(--pb-primary);
}

/*-------------------------
    Pagination
-------------------------*/
.page-link {
  color: var(--pb-primary);
  border-radius: 8px;
}
.page-item.active .page-link {
  background-color: var(--pb-primary);
  border-color: var(--pb-primary);
}

/*-------------------------
    Search
-------------------------*/
.search-wrap {
  max-width: 500px;
}
.search-wrap .form-control {
  border-radius: 10px;
  padding: 0.65rem 1rem;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.08);
  color: #fff;
  font-size: 0.9rem;
}
.search-wrap .form-control::placeholder {
  color: rgba(255,255,255,0.4);
}
.search-wrap .form-control:focus {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.3);
  color: #fff;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.2);
}
.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 1000;
  max-height: 400px;
  overflow-y: auto;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}
.search-results .list-group-item {
  border-left: none;
  border-right: none;
  padding: 0.75rem 1rem;
}
.search-results .list-group-item a {
  display: block;
}
.search-results .list-group-item:hover {
  background: var(--pb-bg-light);
}
.search-results .list-group-item strong {
  font-size: 0.95rem;
}
.search-results .list-group-item small {
  color: var(--pb-text-muted);
  font-size: 0.8rem;
}

/*-------------------------
    Responsive
-------------------------*/
@media (max-width: 991px) {
  .sidebar {
    padding: 2rem 0 0;
    border-top: 1px solid var(--pb-border);
    margin-top: 1rem;
  }
  .hero h1 {
    font-size: 2.5rem;
  }
  .article-header h1 {
    font-size: 1.75rem;
  }
}
@media (max-width: 767px) {
  .hero {
    padding: 3.5rem 0;
    text-align: center;
  }
  .hero h1 {
    font-size: 2.25rem;
  }
  .hero .lead {
    margin: 0 auto;
  }
  .hero-photo {
    margin-bottom: 2rem;
  }
}