:root {
  --bg: #ffffff;
  --header-bg: #e0f2fe;      
  --card-bg: #ffffff;        
  --about-bg: #e0f2fe;       
  --text: #0f172a;
  --muted: #4b5563;
  --accent: #2563eb;
  --radius: 12px;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.10);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: #ffffff;      
  color: var(--text);
}


.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0.9rem 7vw;
  background: var(--header-bg);      
  border-bottom: 1px solid #bfdbfe;
}

.logo {
  font-family: 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none; 
}

.logo-main {
  background: linear-gradient(120deg, #1d4ed8, #4f46e5);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo-sub {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.16em;
  background: rgba(37, 99, 235, 0.12);
  color: #1d4ed8;
  border: 1px solid rgba(129, 140, 248, 0.7);
}

.logo-dot {
  font-weight: 500;
  font-size: 14px;
  color: #64748b;
}

.logo:hover .logo-sub {
  background: rgba(79, 70, 229, 0.18);
  border-color: rgba(79, 70, 229, 1);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.main-nav a {
  margin-left: 1.4rem;
  font-size: 0.95rem;
  color: #111827;
  text-decoration: none;
}

.main-nav a:hover {
  color: var(--accent);
}

.theme-toggle {
  margin-left: 1.4rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid #cbd5f5;
  background: #ffffff;
  color: #0f172a;
  font-size: 0.9rem;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}


.search-container {
  flex: 1;
  max-width: 420px;
  margin: 0 auto;
  position: relative;
}

#searchbar {
  width: 100%;
  padding: 10px 40px 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,0.08);
  background: #ffffff;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.16);
  font-size: 14px;
  outline: none;
  transition: box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

#searchbar::placeholder {
  color: #9ca3af;
}

#searchbar:focus {
  border-color: #4f46e5;
  box-shadow: 0 10px 30px rgba(79, 70, 229, 0.2);
  background: #ffffff;
}


.layout {
  display: grid;
  grid-template-columns: minmax(0, 2.5fr) minmax(320px, 1.4fr);
  gap: 2.5rem;
  padding: 2.5rem 7vw 3rem;
  background: #ffffff;
}


.articles h1 {
  margin: 0 0 0.6rem;
  font-size: 1.7rem;
}

.lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  max-width: 40rem;
}

.articles h1,
.sidebar h2 {
  font-family: 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: none;
  color: #020617;
}

.articles h1 {
  background: linear-gradient(120deg, #0f172a, #111827);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}


.card {
  background: var(--card-bg);     
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid #e5e7eb;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}



.btn {
  align-self: flex-start;
  margin-top: 0.4rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, 0.4);
  background: rgba(37, 99, 235, 0.08);
  color: #1d4ed8;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  text-decoration: none;
}

.btn:hover {
  background: rgba(37, 99, 235, 0.16);
  border-color: #2563eb;
  color: #2563eb;
}



.sidebar {
  background: var(--about-bg);     
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid #bfdbfe;
  align-self: flex-start;
}

.avatar {
  width: 96px;
  height: 96px;
  border-radius: 999px;
  object-fit: cover;
  display: block;
  margin-bottom: 1rem;
}

.sidebar h2 {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(15,23,42,0.04);
  border: 1px solid rgba(148, 163, 184, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.sidebar h2::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
}

.sidebar p {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: justify;
}

.sidebar-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.8rem;
}

.sidebar-links a {
  font-size: 0.8rem;
  text-decoration: none;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid #d1d5db;
  color: var(--text);
}

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


.site-footer {
  padding: 16px 32px;
  font-size: 12px;
  color: #9ca3af;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(148, 163, 184, 0.35);
  background: #ffffff;
}

.site-footer small {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}


@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .site-header {
    padding-inline: 5vw;
    flex-wrap: wrap;
  }
}


body.dark {
  background: #020617;
  color: #e5e7eb;
}

body.dark .site-header {
  background: #020617;
  border-bottom-color: rgba(148, 163, 184, 0.5);
}

body.dark .logo-main {
  background: linear-gradient(120deg, #38bdf8, #a5b4fc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

body.dark .logo-sub {
  background: rgba(15,23,42,0.8);
  color: #e5e7eb;
  border-color: rgba(148, 163, 184, 0.7);
}

body.dark .logo-dot {
  color: #9ca3af;
}

body.dark .main-nav a {
  color: #e5e7eb;
}

body.dark .main-nav a:hover {
  color: #38bdf8;
}

body.dark .theme-toggle {
  background: transparent;
  border-color: rgba(148,163,184,0.7);
  color: #e5e7eb;
}

body.dark .theme-toggle:hover {
  border-color: #38bdf8;
  color: #38bdf8;
}

body.dark #searchbar {
  background: #020617;
  border-color: rgba(148,163,184,0.5);
  box-shadow: 0 8px 30px rgba(15,23,42,0.9);
  color: #e5e7eb;
}

body.dark #searchbar::placeholder {
  color: #64748b;
}

body.dark .layout {
  background: #020617;
}

body.dark .card {
  background: #0b1120;
  border-color: rgba(148, 163, 184, 0.6);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.9);
}

body.dark .sidebar {
  background: #0b1120;
  border-color: rgba(148, 163, 184, 0.6);
}

body.dark .card h3,
body.dark .sidebar h2,
body.dark .articles h1 {
  color: #e5e7eb;
  background: none;
}

body.dark .card p,
body.dark .sidebar p,
body.dark .lead {
  color: #cbd5f5;
}

body.dark .sidebar h2 {
  background: rgba(15,23,42,0.9);
  border-color: rgba(148,163,184,0.7);
}

body.dark .sidebar h2::before {
  background: linear-gradient(135deg, #38bdf8, #a5b4fc);
}

body.dark .btn {
  border-color: rgba(96, 165, 250, 0.8);
  background: rgba(37, 99, 235, 0.18);
  color: #bfdbfe;
}

body.dark .btn:hover {
  border-color: #60a5fa;
  background: rgba(37, 99, 235, 0.28);
  color: #ffffff;
}

body.dark .sidebar-links a {
  border-color: rgba(148, 163, 184, 0.6);
  color: #e5e7eb;
}

body.dark .sidebar-links a:hover {
  border-color: #38bdf8;
  color: #38bdf8;
}

body.dark .site-footer {
  color: #9ca3af;
  background: #020617;
}


.title-link {
  color: inherit;
  text-decoration: none;
}

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