/* ==========================================================================
   ankitiqcode — Blog Home
   Vanilla CSS3 — Design tokens, layout, components, motion
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root{
  /* Brand palette */
  --bg:            #0F172A;
  --bg-soft:       #0B1220;
  --primary:       #2563EB;
  --primary-dim:   #1D4ED8;
  --accent:        #38BDF8;
  --card:          #1E293B;
  --card-hover:    #24324a;
  --text:          #F8FAFC;
  --text-muted:    #94A3B8;
  --text-faint:    #64748B;
  --border:        rgba(248,250,252,0.08);
  --border-strong: rgba(248,250,252,0.16);

  /* Gradients */
  --grad-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  --grad-hero: radial-gradient(60% 60% at 20% 20%, rgba(37,99,235,0.35) 0%, rgba(37,99,235,0) 60%),
               radial-gradient(50% 50% at 85% 15%, rgba(56,189,248,0.30) 0%, rgba(56,189,248,0) 60%),
               radial-gradient(70% 70% at 50% 100%, rgba(37,99,235,0.25) 0%, rgba(37,99,235,0) 60%);

  /* Typography */
  --font-display: 'Sora', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Shape & elevation */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --shadow-sm: 0 4px 14px rgba(2, 6, 23, 0.35);
  --shadow-md: 0 12px 32px rgba(2, 6, 23, 0.45);
  --shadow-glow: 0 0 0 1px rgba(56,189,248,0.15), 0 18px 40px rgba(37,99,235,0.25);

  /* Layout */
  --container-w: 1180px;
  --nav-h: 76px;

  /* Motion */
  --ease: cubic-bezier(.22,.9,.31,1);
  --t-fast: .2s;
  --t-med: .4s;
  --t-slow: .8s;
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
ul{ list-style: none; margin: 0; padding: 0; }
button, input{ font: inherit; color: inherit; }
h1,h2,h3,h4{ font-family: var(--font-display); font-weight: 700; line-height: 1.2; margin: 0; }
p{ margin: 0; }

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden{
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link{
  position: absolute; top: -100px; left: 1rem; z-index: 999;
  background: var(--primary); color: #fff; padding: .7rem 1.2rem;
  border-radius: var(--radius-sm); transition: top var(--t-fast) var(--ease);
}
.skip-link:focus{ top: 1rem; }

.container{
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- Glassmorphism ---------- */
.glass{
  background: rgba(30, 41, 59, 0.55);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border: 1px solid var(--border);
}

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .85rem 1.6rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
  white-space: nowrap;
}
.btn--primary{
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 8px 24px rgba(37,99,235,0.35);
}
.btn--primary:hover{ transform: translateY(-2px); box-shadow: 0 14px 32px rgba(37,99,235,0.45); }
.btn--ghost{
  background: rgba(248,250,252,0.04);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn--ghost:hover{ background: rgba(248,250,252,0.09); border-color: var(--accent); transform: translateY(-2px); }
.btn--sm{ padding: .6rem 1.2rem; font-size: .85rem; }

/* ---------- Eyebrow / section head ---------- */
.eyebrow{
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 .6rem;
}
.eyebrow::before{ content: "// "; color: var(--text-faint); }

.section{ padding-block: 84px; }
.section__head{ margin-bottom: 2.4rem; max-width: 640px; }
.section__title{ font-size: clamp(1.6rem, 2.4vw, 2.1rem); }
.text-accent{ color: var(--accent); }

/* ==========================================================================
   NAVBAR
   ========================================================================== */
.navbar{
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.navbar.is-scrolled{ background: rgba(11, 18, 32, 0.9); box-shadow: var(--shadow-sm); }

.navbar__inner{ display: flex; align-items: center; justify-content: space-between; width: 100%; }

.navbar__logo{ display: inline-flex; align-items: center; gap: .55rem; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }
.navbar__logo-icon{
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--accent);
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.3);
  padding: .3rem .45rem;
  border-radius: 6px;
}

.navbar__menu{ display: flex; align-items: center; gap: 2.1rem; }
.navbar__link{
  position: relative;
  font-size: .95rem; font-weight: 500; color: var(--text-muted);
  padding-block: 6px;
  transition: color var(--t-fast) var(--ease);
}
.navbar__link::after{
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--grad-primary); transition: width var(--t-fast) var(--ease);
}
.navbar__link:hover, .navbar__link.is-active{ color: var(--text); }
.navbar__link:hover::after, .navbar__link.is-active::after{ width: 100%; }

.navbar__toggle{
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; background: none; border: none; cursor: pointer;
}
.navbar__toggle span{
  display: block; width: 22px; height: 2px; background: var(--text);
  border-radius: 2px; transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.navbar__toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.navbar__toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.navbar__toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{
  position: relative;
  padding-top: calc(96px + var(--nav-h));
  padding-bottom: 96px;
  overflow: hidden;
}
.hero__bg{ position: absolute; inset: 0; z-index: 0; }
.hero__gradient{
  position: absolute; inset: -10%;
  background: var(--grad-hero);
  background-size: 180% 180%;
  animation: gradientDrift 16s ease-in-out infinite;
}
@keyframes gradientDrift{
  0%, 100%{ background-position: 0% 0%; }
  50%{ background-position: 100% 100%; }
}
.hero__grid{
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(248,250,252,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(248,250,252,0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(60% 60% at 50% 30%, #000 20%, transparent 85%);
}

.floating-icon{
  position: absolute;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--accent);
  opacity: .35;
  background: rgba(56,189,248,0.06);
  border: 1px solid rgba(56,189,248,0.18);
  padding: .35rem .6rem;
  border-radius: 8px;
  animation: floatIcon 7s ease-in-out infinite;
}
.fi-1{ top: 14%; left: 6%; animation-delay: 0s; }
.fi-2{ top: 68%; left: 10%; animation-delay: 1.2s; }
.fi-3{ top: 22%; left: 88%; animation-delay: .6s; }
.fi-4{ top: 78%; left: 82%; animation-delay: 2s; }
.fi-5{ top: 48%; left: 4%; animation-delay: 1.6s; font-size: 1.1rem; }
.fi-6{ top: 6%; left: 48%; animation-delay: 2.4s; }
@keyframes floatIcon{
  0%, 100%{ transform: translateY(0) rotate(0deg); }
  50%{ transform: translateY(-16px) rotate(-2deg); }
}

.hero__inner{
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 3.5rem;
  align-items: center;
}
.hero__title{
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  letter-spacing: -0.02em;
  margin-bottom: 1.1rem;
}
.hero__subtitle{
  font-size: 1.08rem; color: var(--text-muted); max-width: 520px; margin-bottom: 2rem;
}
.hero__cta{ display: flex; gap: 1rem; flex-wrap: wrap; }

/* Terminal / signature element */
.terminal{
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glow);
  overflow: hidden;
  animation: floatIcon 8s ease-in-out infinite;
}
.terminal__bar{
  display: flex; align-items: center; gap: 8px;
  padding: .8rem 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.dot{ width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot--red{ background: #EF4444; } .dot--yellow{ background: #F59E0B; } .dot--green{ background: #22C55E; }
.terminal__title{ margin-left: .5rem; font-family: var(--font-mono); font-size: .78rem; color: var(--text-faint); }
.terminal__body{
  margin: 0; padding: 1.4rem 1.4rem 2rem;
  font-family: var(--font-mono); font-size: .86rem; line-height: 1.8;
  color: #C7D8F5; min-height: 220px; white-space: pre-wrap; word-break: break-word;
}
.terminal__cursor{ color: var(--accent); animation: blink 1s step-start infinite; }
@keyframes blink{ 50%{ opacity: 0; } }

/* ==========================================================================
   SEARCH + CATEGORIES
   ========================================================================== */
.explore{ padding-top: 56px; display: flex; flex-direction: column; gap: 1.6rem; }

.search-bar{
  display: flex; align-items: center; gap: .7rem;
  border-radius: var(--radius-pill);
  padding: .2rem .4rem .2rem 1.2rem;
  max-width: 620px;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.search-bar:focus-within{ border-color: var(--accent); box-shadow: 0 0 0 4px rgba(56,189,248,0.12); }
.search-bar__icon{ color: var(--text-faint); flex-shrink: 0; }
.search-bar__input{
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); padding: .9rem 0; font-size: .95rem;
}
.search-bar__input::placeholder{ color: var(--text-faint); }
.search-bar__clear{
  background: rgba(248,250,252,0.08); border: none; color: var(--text-muted);
  width: 30px; height: 30px; border-radius: 50%; cursor: pointer; font-size: 1.1rem; line-height: 1;
  transition: background var(--t-fast) var(--ease);
}
.search-bar__clear:hover{ background: rgba(248,250,252,0.16); }

.categories{ display: flex; flex-wrap: wrap; gap: .65rem; }
.category-chip{
  background: rgba(248,250,252,0.03);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  padding: .55rem 1.15rem;
  border-radius: var(--radius-pill);
  font-size: .85rem; font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease);
}
.category-chip:hover{ color: var(--text); border-color: var(--accent); }
.category-chip.is-active{
  background: var(--grad-primary); color: #fff; border-color: transparent;
  box-shadow: 0 6px 18px rgba(37,99,235,0.35);
}

.no-results{ color: var(--text-muted); font-style: italic; padding-block: 1.5rem; }

/* ==========================================================================
   FEATURED CARD
   ========================================================================== */
.featured-card{
  display: grid; grid-template-columns: 1.05fr 1fr;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}
.featured-card:hover{ transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.featured-card__media{ position: relative; display: block; min-height: 280px; }
.featured-card__media img{ width: 100%; height: 100%; object-fit: cover; }
.badge{
  position: absolute; top: 1rem; left: 1rem;
  font-family: var(--font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .04em;
  padding: .4rem .8rem; border-radius: var(--radius-pill);
  background: rgba(15,23,42,0.75); color: var(--accent); border: 1px solid rgba(56,189,248,0.4);
  backdrop-filter: blur(6px);
}
.featured-card__body{ padding: 2.2rem; display: flex; flex-direction: column; gap: 1rem; }
.featured-card__title{ font-size: clamp(1.25rem, 2vw, 1.6rem); }
.featured-card__title a:hover{ color: var(--accent); }
.featured-card__desc{ color: var(--text-muted); }

.post-meta{ display: flex; align-items: center; flex-wrap: wrap; gap: .5rem; font-size: .83rem; color: var(--text-faint); }
.post-meta__author{ display: flex; align-items: center; gap: .5rem; color: var(--text-muted); font-weight: 500; }
.avatar{ width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border-strong); }

/* ==========================================================================
   ARTICLES GRID
   ========================================================================== */
.grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.7rem; }

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease), border-color var(--t-med) var(--ease), background var(--t-med) var(--ease);
}
.card:hover{
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(56,189,248,0.3);
  background: var(--card-hover);
}
.card__media{ position: relative; aspect-ratio: 16/10; overflow: hidden; }
.card__media img{ width: 100%; height: 100%; object-fit: cover; transition: transform var(--t-slow) var(--ease); }
.card:hover .card__media img{ transform: scale(1.08); }

.card__body{ padding: 1.4rem 1.4rem 1.6rem; display: flex; flex-direction: column; gap: .8rem; flex: 1; }
.card__title{ font-size: 1.06rem; line-height: 1.4; }
.card__title a{ transition: color var(--t-fast) var(--ease); }
.card:hover .card__title a{ color: var(--accent); }
.card__desc{ color: var(--text-muted); font-size: .9rem; flex: 1; }
.card__footer{ display: flex; align-items: center; justify-content: space-between; margin-top: .3rem; }
.card__readmore{
  font-family: var(--font-mono); font-size: .8rem; font-weight: 600; color: var(--accent);
  display: inline-flex; align-items: center; gap: .3rem;
  transition: gap var(--t-fast) var(--ease);
}
.card__readmore:hover{ gap: .55rem; }

/* ==========================================================================
   TAGS
   ========================================================================== */
.tag-cloud{ display: flex; flex-wrap: wrap; gap: .8rem; }
.tag{
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--accent);
  background: rgba(56,189,248,0.06);
  border: 1px solid rgba(56,189,248,0.25);
  padding: .55rem 1.1rem;
  border-radius: var(--radius-pill);
  transition: all var(--t-fast) var(--ease);
}
.tag:hover{ background: var(--grad-primary); color: #fff; border-color: transparent; transform: translateY(-2px); }

/* ==========================================================================
   NEWSLETTER
   ========================================================================== */
.newsletter__card{
  border-radius: var(--radius-lg);
  padding: 3rem;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.newsletter__card::before{
  content: "";
  position: absolute; inset: 0;
  background: var(--grad-hero);
  opacity: .5; z-index: -1;
}
.newsletter__text p{ color: var(--text-muted); margin-top: .6rem; }
.newsletter__form{ display: flex; gap: .7rem; flex-wrap: wrap; }
.newsletter__form input{
  flex: 1; min-width: 200px;
  background: rgba(15,23,42,0.55);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  padding: .9rem 1.3rem;
  color: var(--text);
  outline: none;
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.newsletter__form input:focus{ border-color: var(--accent); box-shadow: 0 0 0 4px rgba(56,189,248,0.12); }
.newsletter__form input.is-invalid{ border-color: #EF4444; box-shadow: 0 0 0 4px rgba(239,68,68,0.12); }
.newsletter__msg{ grid-column: 1 / -1; font-size: .88rem; margin-top: .8rem; min-height: 1.2em; }
.newsletter__msg.success{ color: #4ADE80; }
.newsletter__msg.error{ color: #F87171; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer{ border-top: 1px solid var(--border); padding-top: 64px; background: var(--bg-soft); }
.footer__grid{
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 2.5rem;
  padding-bottom: 48px;
}
.footer__about p{ color: var(--text-muted); font-size: .9rem; margin-top: 1rem; max-width: 340px; }
.footer__col h3{ font-size: .92rem; margin-bottom: 1.1rem; color: var(--text); }
.footer__col ul{ display: flex; flex-direction: column; gap: .7rem; }
.footer__col a{ color: var(--text-muted); font-size: .9rem; transition: color var(--t-fast) var(--ease); }
.footer__col a:hover{ color: var(--accent); }
.footer__socials{ display: flex; gap: .8rem; }
.footer__socials a{
  width: 38px; height: 38px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  background: rgba(248,250,252,0.04); border: 1px solid var(--border-strong); color: var(--text-muted);
  transition: all var(--t-fast) var(--ease);
}
.footer__socials a:hover{ color: #fff; background: var(--grad-primary); border-color: transparent; transform: translateY(-3px); }
.footer__bottom{
  border-top: 1px solid var(--border);
  padding-block: 1.6rem;
  text-align: center;
  font-size: .84rem;
  color: var(--text-faint);
}

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
.back-to-top{
  position: fixed; bottom: 28px; right: 28px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--grad-primary); color: #fff; border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0; transform: translateY(10px);
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.back-to-top.is-visible{ opacity: 1; transform: translateY(0); }
.back-to-top:hover{ transform: translateY(-4px); }

/* ==========================================================================
   REVEAL ANIMATIONS
   ========================================================================== */
.reveal{
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
.reveal.is-visible{ opacity: 1; transform: translateY(0); }

.hero__content .reveal, .hero__panel.reveal{ transition-delay: .1s; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px){
  .grid{ grid-template-columns: repeat(2, 1fr); }
  .hero__inner{ grid-template-columns: 1fr; }
  .hero__panel{ max-width: 520px; }
  .featured-card{ grid-template-columns: 1fr; }
  .footer__grid{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px){
  .navbar__nav{
    position: fixed; inset: var(--nav-h) 0 0 auto;
    width: min(78vw, 320px); height: calc(100vh - var(--nav-h));
    background: rgba(11,18,32,0.98);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform var(--t-med) var(--ease);
    padding: 2rem 1.6rem;
  }
  .navbar__nav.is-open{ transform: translateX(0); }
  .navbar__menu{ flex-direction: column; align-items: flex-start; gap: 1.5rem; }
  .navbar__toggle{ display: flex; }

  .grid{ grid-template-columns: 1fr; }
  .categories{ overflow-x: auto; flex-wrap: nowrap; padding-bottom: .4rem; }
  .newsletter__card{ grid-template-columns: 1fr; padding: 2rem; }
  .newsletter__form{ flex-direction: column; }
  .newsletter__form button{ width: 100%; justify-content: center; }
  .footer__grid{ grid-template-columns: 1fr; }
  .section{ padding-block: 56px; }
}

@media (max-width: 460px){
  .hero{ padding-top: calc(64px + var(--nav-h)); }
  .hero__cta{ flex-direction: column; align-items: stretch; }
  .hero__cta .btn{ justify-content: center; }
}

/* ==========================================================================
   ARTICLE PAGE ADD-ONS
   Appended for individual blog article pages (e.g. python-interview-questions.html)
   Existing rules above this line are untouched. Reuses the same design tokens
   (--bg, --card, --accent, --radius-*, --t-*, etc.) defined in :root above —
   no new tokens, no overrides of existing selectors.
   ========================================================================== */

/* ---------- Reading progress bar ---------- */
.reading-progress{
  position: fixed; top: 0; left: 0; width: 100%; height: 3px;
  background: transparent; z-index: 200;
}
.reading-progress__bar{
  height: 100%; width: 0%;
  background: var(--grad-primary);
  transition: width 0.1s linear;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb{ padding-top: 18px; }
.breadcrumb__list{ display: flex; flex-wrap: wrap; gap: .5rem; font-size: .85rem; color: var(--text-faint); }
.breadcrumb__list a{ color: var(--text-muted); transition: color var(--t-fast) var(--ease); }
.breadcrumb__list a:hover{ color: var(--accent); }
.breadcrumb__list li[aria-current="page"]{ color: var(--text); }

/* ---------- Article hero variant ---------- */
.hero--article{ padding-top: calc(56px + var(--nav-h)); padding-bottom: 40px; }
.hero__inner--article{ grid-template-columns: 1fr; text-align: left; }
.badge--static{ position: static; display: inline-flex; margin-bottom: 1rem; }
.article-meta{ margin-top: 1.4rem; }

.article-hero-image{ margin-top: 8px; margin-bottom: 8px; }
.article-cover{
  width: 100%; max-height: 460px; object-fit: cover;
  border-radius: var(--radius-lg); border: 1px solid var(--border);
}

/* ---------- Article layout: TOC + content ---------- */
.article-layout{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  padding-block: 56px;
  align-items: start;
}

.toc{
  position: sticky; top: calc(var(--nav-h) + 20px);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.3rem;
  max-height: calc(100vh - var(--nav-h) - 40px);
  overflow-y: auto;
}
.toc__title{ font-family: var(--font-mono); font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); margin-bottom: .8rem; }
.toc__list{ display: flex; flex-direction: column; gap: .55rem; counter-reset: toc; }
.toc__list li{ font-size: .88rem; }
.toc__list a{ color: var(--text-muted); transition: color var(--t-fast) var(--ease); }
.toc__list a:hover{ color: var(--accent); }
.toc__list a.is-active{ color: var(--accent); font-weight: 600; }

/* ---------- Article typography ---------- */
.article-content h2{
  font-size: clamp(1.35rem, 2vw, 1.7rem);
  margin-top: 2.6rem;
  margin-bottom: 1.2rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--border);
}
.article-content h2:first-of-type{ margin-top: 0; }
.article-content h3{ font-size: 1.05rem; margin: 0; }
.article-lede{ font-size: 1.05rem; color: var(--text-muted); margin-bottom: 1.6rem; }
.article-content p{ color: var(--text); margin-bottom: .9rem; }
.article-content code{
  font-family: var(--font-mono); font-size: .86em;
  background: rgba(56,189,248,0.08); color: var(--accent);
  padding: .1rem .4rem; border-radius: 5px;
}

/* ---------- Callouts ---------- */
.callout{
  border-radius: var(--radius-md);
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  font-size: .92rem;
  border: 1px solid var(--border);
  background: rgba(248,250,252,0.03);
}
.callout--tip{ border-color: rgba(56,189,248,0.35); background: rgba(56,189,248,0.06); }
.callout--note{ border-color: var(--border-strong); }
.callout--warning{ border-color: rgba(245,158,11,0.4); background: rgba(245,158,11,0.08); }

/* ---------- Tables ---------- */
.article-table{
  width: 100%; border-collapse: collapse; margin: 1.2rem 0;
  font-size: .9rem; border-radius: var(--radius-md); overflow: hidden;
}
.article-table th, .article-table td{
  padding: .7rem 1rem; text-align: left; border-bottom: 1px solid var(--border);
}
.article-table th{ background: rgba(248,250,252,0.04); color: var(--text); font-family: var(--font-display); }
.article-table td{ color: var(--text-muted); }

/* ---------- Question cards ---------- */
.qa-section{ margin-bottom: 1rem; }
.question-card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.6rem;
  margin-bottom: 1.4rem;
}
.question-card__head{
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  margin-bottom: .8rem;
}
.difficulty-badge{
  font-family: var(--font-mono); font-size: .72rem; font-weight: 600;
  padding: .3rem .7rem; border-radius: var(--radius-pill); white-space: nowrap;
}
.difficulty-badge--easy{ background: rgba(74,222,128,0.12); color: #4ADE80; border: 1px solid rgba(74,222,128,0.3); }
.difficulty-badge--medium{ background: rgba(245,158,11,0.12); color: #F59E0B; border: 1px solid rgba(245,158,11,0.3); }
.difficulty-badge--hard{ background: rgba(248,113,113,0.12); color: #F87171; border: 1px solid rgba(248,113,113,0.3); }

.output-label{ font-family: var(--font-mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-faint); margin: .8rem 0 .3rem; }
.output-block{
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .8rem 1rem; font-family: var(--font-mono); font-size: .85rem; color: #C7D8F5;
  white-space: pre-wrap; overflow-x: auto;
}
.explanation{ margin-top: .8rem; font-size: .92rem; color: var(--text-muted); }

/* ---------- Code blocks ---------- */
.code-block{
  border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border);
  margin: 1rem 0; background: var(--bg-soft);
}
.code-block__header{
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem 1rem; border-bottom: 1px solid var(--border); background: rgba(255,255,255,0.02);
}
.code-block__lang{ font-family: var(--font-mono); font-size: .74rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; }
.code-block__copy{ padding: .3rem .8rem; font-size: .74rem; }
.code-block__copy.is-copied{ background: rgba(74,222,128,0.15); border-color: rgba(74,222,128,0.4); color: #4ADE80; }
.code-block__pre{ margin: 0; padding: 1rem 1.2rem; overflow-x: auto; counter-reset: line; position: relative; }
.code-block__code{
  font-family: var(--font-mono); font-size: .86rem; line-height: 1.9; color: #C7D8F5;
  display: block; white-space: pre; padding-left: 2.4rem;
}
.code-block__pre code{ background: none; color: inherit; padding: 0; }

/* ---------- Tips list ---------- */
.tips-list{ display: flex; flex-direction: column; gap: .7rem; padding-left: 1.2rem; list-style: disc; color: var(--text-muted); }

/* ---------- Quick navigation ---------- */
.quick-nav{
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding-block: 1.6rem; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.quick-nav__link{ display: flex; flex-direction: column; gap: .2rem; max-width: 260px; }
.quick-nav__link--next{ text-align: right; margin-left: auto; }
.quick-nav__label{ font-family: var(--font-mono); font-size: .72rem; color: var(--text-faint); text-transform: uppercase; }
.quick-nav__title{ font-size: .9rem; color: var(--text-muted); transition: color var(--t-fast) var(--ease); }
.quick-nav__link:hover .quick-nav__title{ color: var(--accent); }

/* ---------- Share row ---------- */
.share-row{ display: flex; align-items: center; gap: 1rem; padding-block: 1.6rem; flex-wrap: wrap; }
.share-row__label{ font-size: .88rem; color: var(--text-muted); }
.share-row__copy{
  width: 38px; height: 38px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center;
  background: rgba(248,250,252,0.04); border: 1px solid var(--border-strong); color: var(--text-muted);
  cursor: pointer; transition: all var(--t-fast) var(--ease);
}
.share-row__copy:hover{ color: #fff; background: var(--grad-primary); border-color: transparent; transform: translateY(-3px); }
.share-row__copy.is-copied{ color: #4ADE80; border-color: rgba(74,222,128,0.4); }

/* ---------- Author bio ---------- */
.author-bio{
  display: flex; gap: 1.4rem; padding: 1.8rem; border-radius: var(--radius-lg); margin-block: 2rem;
}
.author-bio__photo{ width: 88px; height: 88px; border-radius: 50%; object-fit: cover; border: 2px solid var(--border-strong); flex-shrink: 0; }
.author-bio__body h3{ font-size: 1.1rem; margin-bottom: .5rem; }
.author-bio__body p{ color: var(--text-muted); font-size: .92rem; margin-bottom: 1rem; }
.author-bio__skills{ display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1rem; }
.author-bio__links{ display: flex; flex-wrap: wrap; gap: .7rem; }

/* ---------- FAQ accordion ---------- */
.faq-list{ display: flex; flex-direction: column; gap: .8rem; }
.faq-item{ border-radius: var(--radius-md); overflow: hidden; }
.faq-item__q{
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: none; border: none; text-align: left; cursor: pointer;
  padding: 1.1rem 1.3rem; font-size: .96rem; font-weight: 600; color: var(--text);
}
.faq-item__icon{ font-family: var(--font-mono); color: var(--accent); font-size: 1.2rem; transition: transform var(--t-fast) var(--ease); }
.faq-item__q[aria-expanded="true"] .faq-item__icon{ transform: rotate(45deg); }
.faq-item__a{ max-height: 0; overflow: hidden; transition: max-height var(--t-med) var(--ease); }
.faq-item__a p{ padding: 0 1.3rem 1.2rem; color: var(--text-muted); font-size: .9rem; }

/* ---------- Comments placeholder ---------- */
.comments-placeholder{ padding-block: 56px; }
.comments-placeholder__box{ border-radius: var(--radius-md); padding: 2rem; text-align: center; color: var(--text-muted); }

/* ---------- Article page responsive ---------- */
@media (max-width: 1024px){
  .article-layout{ grid-template-columns: 1fr; }
  .toc{ position: static; max-height: none; }
  .author-bio{ flex-direction: column; align-items: flex-start; }
}
@media (max-width: 760px){
  .quick-nav{ flex-direction: column; align-items: flex-start; }
  .quick-nav__link--next{ text-align: left; margin-left: 0; }
}
/* ========================== END ARTICLE PAGE ADD-ONS ========================== */