/* V3 — Project page styles. Extends project-styles.css for two-column editorial layout. */

/* ── BACKGROUND (identical to project-styles.css) ───────────── */
body {
  margin: 0;
  padding: 0;
  background-image: url("data:image/svg+xml,<svg id='patternId' width='100%' height='100%' xmlns='http://www.w3.org/2000/svg'><defs><pattern id='a' patternUnits='userSpaceOnUse' width='25' height='13' patternTransform='scale(4) rotate(70)'><rect x='0' y='0' width='100%' height='100%' fill='%23090a15ff'/><path d='M15.044 22.25a2.5 2.5 0 01-2.5 2.5 2.5 2.5 0 01-2.5-2.5 2.5 2.5 0 012.5-2.5 2.5 2.5 0 012.5 2.5m2.5 0a5 5 0 01-5 5 5 5 0 01-5-5 5 5 0 015-5 5 5 0 015 5m2.5 0a7.5 7.5 0 01-7.5 7.5 7.5 7.5 0 01-7.5-7.5 7.5 7.5 0 017.5-7.5 7.5 7.5 0 017.5 7.5m2.5 0a10 10 0 01-10 10 10 10 0 01-10-10 10 10 0 0110-10 10 10 0 0110 10m2.5 0a12.5 12.5 0 01-12.5 12.5 12.5 12.5 0 01-12.5-12.5 12.5 12.5 0 0112.5-12.5 12.5 12.5 0 0112.5 12.5m0-9a2.5 2.5 0 00-2.363 1.688 12.5 12.5 0 011.672 3.212 12.5 12.5 0 010 .002 2.5 2.5 0 00.69.098 2.5 2.5 0 002.5-2.5 2.5 2.5 0 00-2.5-2.5zm0-2.5a5 5 0 00-4.143 2.203 12.5 12.5 0 014.053 7.795 5 5 0 00.09.002 5 5 0 005-5 5 5 0 00-5-5zm-.037-2.5a7.5 7.5 0 00-6.125 3.227 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}

/* ── NAV (identical to project-styles.css) ───────────────────── */
.sticky-nav-bread {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(9, 10, 21, 0.3);
  backdrop-filter: blur(7px);
}

.project-nav {
  position: relative;
  width: 100%;
  padding: 1rem 3rem 0 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
}

.project-logo {
  font-family: var(--Kanit);
  font-size: 1.7rem;
  font-weight: 600;
  font-style: italic;
  letter-spacing: -0.5px;
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.4s ease;
}
.project-logo:hover { color: var(--fullwhite); }

.back-button {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  padding: 1rem;
  background: var(--transparent-color);
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.4s ease;
}
.back-button:hover {
  background-color: var(--accent-color);
  transform: translateY(-3px);
  color: var(--fullwhite);
}
.back-icon { width: 20px; height: 20px; transition: transform 0.25s ease; }

/* Breadcrumbs */
.breadcrumbs { display: block; width: 100%; }
.breadcrumbs .container {
  margin: 0 auto;
  font-family: var(--Code-pro);
  font-size: 0.9em;
  margin-left: 3rem;
  display: flex;
  align-items: center;
  white-space: nowrap;
  overflow: hidden;
}
.breadcrumb-title {
  padding-right: 1rem;
  display: block;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.breadcrumbs a { color: var(--text-color); text-decoration: none; transition: color 0.3s ease; }
.breadcrumbs a:hover { color: var(--bold-color); }
.breadcrumbs .separator { margin: 0 0.5em; color: var(--text-color); opacity: 0.5; }
.breadcrumbs span:last-child { color: var(--bold-color); }

/* ── HERO (identical to project-styles.css) ──────────────────── */
.project-hero { padding: 3em 0; text-align: center; }
.project-hero .container { margin: 0 auto; padding: 0 3em; }
.project-hero h1 {
  display: block;
  width: 100%;
  font-family: var(--Kanit);
  font-size: 2.8em;
  font-weight: 700;
  font-style: italic;
  margin-bottom: 3rem;
}
.tagline { font-size: 1.3rem; color: var(--text-color); margin-bottom: 2rem; font-weight: 300; }
.tech-badges { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; margin: 2rem 0; }
.tech-badge {
  background: var(--hover-color);
  color: var(--fullwhite);
  padding: 0.5rem 1.2rem;
  border-radius: 20px;
  font-family: var(--Code-pro);
  font-size: 0.85rem;
  font-weight: 500;
}
.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-top: 2rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2.5rem;
  border-radius: 30px;
  text-decoration: none;
  font-family: var(--Kanit);
  font-weight: 400;
  transition: all 0.4s ease;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.btn-primary { background: var(--accent-color); color: var(--fullwhite); }
.btn-primary:hover { background: var(--bold-color); transform: translateY(-4px); }
.btn-secondary { background: var(--transparent-color); color: var(--text-color); }
.btn-secondary:hover { background: rgba(255,255,255,0.08); border-color: var(--bold-color); color: var(--fullwhite); transform: translateY(-4px); }

/* ── SECTION SHELL (full-width wrappers) ─────────────────────── */
.project-section { padding: 1.5rem 0; }
.container { max-width: 80%; margin: 0 auto; }

/* Section divider — line · TEXT · line */
.section-divider {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.section-divider .line { flex: 1; height: 1px; background: var(--transparent-color-line); }
.section-divider h2 {
  font-family: var(--Kanit);
  font-size: 1.4rem;
  font-style: italic;
  font-weight: 700;
  color: var(--text-color);
  white-space: nowrap;
  margin: 0;
}

/* ── ARCHITECTURE (full-width, identical to project-styles.css) ── */
.architecture-section { background: transparent; }
.architecture-content { margin-top: 3rem; text-align: center; }
.architecture-image-container {
  max-width: 800px;
  margin: 0 auto 2rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border-radius: 15px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.architecture-image { width: 100%; height: auto; display: block; transition: transform 0.3s ease; }
.architecture-image-container:hover .architecture-image { transform: scale(1.02); }
.architecture-text {
  max-width: 800px;
  margin: 0 auto;
  color: var(--text-color);
  font-size: 1.1rem;
  line-height: 1.8;
  text-align: left;
}

/* ── MOBILE AUTHOR BAR (hidden desktop, shown ≤768px, sticky) ── */
.mobile-author-bar {
  display: none;
  padding: 0 2rem;
  position: sticky;
  top: 4rem; /* sits just under the sticky nav */
  z-index: 900;
  background: rgba(9, 10, 21, 0.92);
  backdrop-filter: blur(5px);
}
.mobile-author-inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.75rem 0;
}
.mobile-author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.mobile-author-text { font-family: var(--Poppins); font-size: 0.85rem; color: var(--text-color); flex: 1; }
.mobile-author-icon { color: var(--text-color); transition: color 0.2s; display: flex; align-items: center; }
.mobile-author-icon:hover { color: var(--bold-color); }

/* ── TWO-COLUMN LAYOUT ───────────────────────────────────────── */
.two-col-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  max-width: 80%;
  margin: 0 auto;
  padding: 3rem 0;
  align-items: start;
}

/* Left column — text constrained for editorial margins */
.article-col { min-width: 0; }

/* Right column — sticky */
.sidebar-col {
  position: sticky;
  top: 6rem; /* clears the sticky navbar */
  height: fit-content;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Glass card (same visual as existing cards) */
.sidebar-card {
  background: var(--transparent-color);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(7px);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.3s ease;
}

/* Author Card */
.author-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.author-info { display: flex; flex-direction: column; gap: 0.15rem; }
.author-name { font-family: var(--Poppins); font-weight: 600; font-size: 0.9rem; color: var(--fullwhite); }
.author-title { font-family: var(--Poppins); font-size: 0.75rem; color: var(--text-color); }
.author-socials { display: flex; gap: 0.75rem; padding-top: 0.25rem; }
.social-icon { color: var(--text-color); transition: color 0.2s; display: flex; align-items: center; }
.social-icon:hover { color: var(--bold-color); }

/* TOC Card */
.toc-label {
  font-family: var(--Kanit);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-color);
  margin-bottom: 0.75rem;
}
.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list li { padding: 0; }
.toc-item {
  display: block;
  font-family: var(--Poppins);
  font-size: 0.85rem;
  color: var(--text-color);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-left: 3px solid transparent;
  border-radius: 0 4px 4px 0;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.toc-item:hover { color: var(--fullwhite); border-left-color: var(--bold-color); }
.toc-item.active {
  color: var(--fullwhite);
  border-left: 3px solid var(--bold-color);
  background: rgba(214, 106, 18, 0.08);
}

/* ── ARTICLE TYPOGRAPHY ──────────────────────────────────────── */
#article-content h2 {
  font-family: var(--Kanit);
  font-style: italic;
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--fullwhite);
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
  padding-left: 1rem;
  border-left: 3px solid var(--bold-color);
}
#article-content h3 {
  font-family: var(--Poppins);
  font-weight: 600;
  font-size: 1rem;
  color: var(--fullwhite);
  margin-top: 1.25rem;
  margin-bottom: 0.35rem;
}
#article-content p {
  font-family: var(--Poppins);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-color);
  margin-bottom: 0.75rem;
}
#article-content ol,
#article-content ul {
  padding-left: 1.4rem;
  color: var(--text-color);
  line-height: 1.65;
  font-family: var(--Poppins);
  font-size: 0.95rem;
}
#article-content li { margin-bottom: 0.35rem; }
#article-content strong { color: var(--fullwhite); }

/* Challenge counter label */
.challenge-label {
  font-family: var(--Code-pro);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bold-color);
  margin: 2rem 0 0.2rem;
  opacity: 0.85;
}

/* Challenge problem / solution blocks — match original page colors */
.challenge-problem {
  background: rgba(214, 106, 18, 0.1);
  border-left: 4px solid var(--accent-color);
  border-radius: 8px;
  padding: 0.85rem 1.1rem;
  margin: 0.75rem 0;
}
.challenge-problem p { margin-bottom: 0; color: var(--text-color); }

.challenge-solution {
  background: rgba(227, 231, 23, 0.07);
  border-left: 4px solid var(--t-color);
  border-radius: 8px;
  padding: 0.85rem 1.1rem;
  margin: 0.75rem 0 1.25rem;
}
.challenge-solution p { margin-bottom: 0; color: var(--text-color); }

/* Lessons list — numbered cards */
.lessons-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.lesson-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--transparent-color);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
  transition: background 0.3s ease, border-color 0.3s ease;
}
.lesson-item:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(214, 106, 18, 0.3);
}
.lesson-num {
  font-family: var(--Kanit);
  font-size: 1.1rem;
  font-style: italic;
  font-weight: 700;
  color: var(--bold-color);
  min-width: 2rem;
  line-height: 1.5;
  flex-shrink: 0;
}
.lesson-item p {
  margin: 0;
  line-height: 1.6;
  color: var(--text-color);
  font-size: 0.93rem;
}

/* Code blocks */
.code-block {
  position: relative;
  background: var(--hover-color);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  margin: 2rem 0;
  overflow-x: auto;
}
.code-lang {
  position: absolute;
  top: 0.6rem;
  right: 3rem;
  font-size: 0.7rem;
  color: var(--text-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--Code-pro);
}
.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-color);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  cursor: pointer;
  font-family: var(--Poppins);
  transition: color 0.2s, border-color 0.2s;
}
.copy-btn:hover { color: var(--fullwhite); border-color: var(--bold-color); }
.code-block pre { margin: 0; padding-top: 0.5rem; }
.code-block code { font-family: var(--Code-pro); font-size: 0.9rem; }

/* ── METRICS (identical to project-styles.css) ───────────────── */
.metrics-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  margin-top: 3rem;
}
.metric-card {
  background: var(--accent-color);
  padding: 2.5rem 1.5rem;
  border-radius: 15px;
  text-align: center;
  transition: transform 0.3s ease;
  min-width: 160px;
}
.metric-card:hover { transform: translateY(-8px); }
.metric-number { font-family: var(--Kanit); font-size: 2.8rem; font-weight: 700; color: var(--fullwhite); margin-bottom: 0.5rem; }
.metric-label { font-family: var(--Code-pro); font-size: 1rem; color: rgba(255,255,255,0.9); }

/* ── CTA / EXPLORE MORE ──────────────────────────────────────── */
.cta-section { text-align: center; padding: 5rem 0; }
.cta-section h2 { font-family: var(--Kanit); color: var(--fullwhite); font-size: 2.2rem; margin-bottom: 2rem; }
.cta-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.cta-section .btn-primary { background: var(--accent-color); color: var(--fullwhite); }
.cta-section .btn-secondary { background: transparent; color: var(--fullwhite); border: 2px solid var(--fullwhite); }
.cta-section .btn-primary:hover { background: var(--transparent-color); border: 2px solid var(--accent-color); }
.cta-section .btn-secondary:hover { border: 2px solid var(--accent-color); }

/* ── LIGHTBOX (identical to project-styles.css) ──────────────── */
.lightbox {
  display: none;
  position: fixed;
  z-index: 9999;
  padding-top: 50px;
  left: 0; top: 0;
  width: 100%; height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.95);
  backdrop-filter: blur(5px);
}
.lightbox-content {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 85vh;
  border-radius: 8px;
  animation: zoom 0.3s;
}
@keyframes zoom {
  from { transform: scale(0.8); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}
.lightbox-close {
  position: absolute;
  top: 20px; right: 40px;
  color: var(--fullwhite);
  font-size: 50px;
  font-weight: bold;
  transition: 0.3s;
  cursor: pointer;
  z-index: 10000;
}
.lightbox-close:hover { color: var(--bold-color); }
#lightbox-caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: var(--text-color);
  padding: 20px 0;
  font-family: var(--Code-pro);
}

/* ── MOBILE TOC FLOAT BUTTON & DRAWER ───────────────────────── */
.toc-float-btn {
  display: none;
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--transparent-color);
  border: 1px solid var(--bold-color);
  color: var(--fullwhite);
  border-radius: 12px;
  padding: 0.6rem 1rem;
  font-family: var(--Poppins);
  font-size: 0.85rem;
  cursor: pointer;
  backdrop-filter: blur(7px);
  z-index: 900;
  transition: background 0.2s, transform 0.2s;
}
.toc-float-btn:hover { background: rgba(214,106,18,0.15); transform: translateY(-2px); }

.toc-drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1050;
}
.toc-drawer-overlay.open { display: block; }

.toc-drawer {
  display: block;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: rgba(9, 10, 21, 0.97);
  border-top: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(7px);
  max-height: 60vh;
  overflow-y: auto;
  padding: 1.5rem;
  z-index: 1100;
  border-radius: 16px 16px 0 0;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}
.toc-drawer.open { transform: translateY(0); }
.toc-drawer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.toc-drawer-close {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}
.toc-drawer-close:hover { color: var(--fullwhite); }

/* ── FOOTER ──────────────────────────────────────────────────── */
footer {
  display: block;
  color: var(--text-gray);
  background-color: black;
  text-align: center;
  padding: 1.5rem;
}

/* ── RESPONSIVE — ≤768px ─────────────────────────────────────── */
@media screen and (max-width: 768px) {

  /* Single column — hide sidebar */
  .two-col-layout {
    grid-template-columns: 1fr;
    max-width: 90%;
    gap: 0;
    padding: 1.5rem 0;
  }
  .sidebar-col { display: none; }

  /* Show mobile author bar */
  .mobile-author-bar { display: block; }

  /* Show float TOC */
  .toc-float-btn { display: block; }

  /* Nav */
  .project-nav { padding: 1rem 1.5rem 0 1.5rem; }
  .project-logo { font-size: 1.4em; }
  .back-button { padding: 0.5rem; }
  .back-icon { width: 18px; height: 18px; }
  .breadcrumbs .container { font-size: 0.8rem; margin-left: 1.5rem; }

  /* Hero */
  .project-hero h1 { font-size: 2rem; }
  .tagline { font-size: 1.1rem; }
  .hero-buttons { flex-direction: column; padding: 0 1rem; }
  .btn { width: 100%; justify-content: center; }

  /* Container */
  .container { max-width: 90%; }

  /* Code blocks scroll */
  .code-block { overflow-x: scroll; }
  .code-block pre { white-space: pre; }

  /* Metrics 2-col */
  .metrics-grid { display: grid; grid-template-columns: repeat(2, 1fr); }
  .metric-card { min-width: unset; }
  .metric-number { font-size: 2.2rem; }

  /* Lightbox */
  .lightbox-close { top: 10px; right: 20px; font-size: 35px; }
}