/**
 * Habibur Shanto — Signature
 * Frontend Component Enhancements & Editorial Styling
 */

:root {
  --sig-canvas: var(--wp--preset--color--canvas, #F8F7F4);
  --sig-surface: var(--wp--preset--color--surface, #FFFFFF);
  --sig-surface-subtle: var(--wp--preset--color--surface-subtle, #F1EFEA);
  --sig-surface-dark: var(--wp--preset--color--surface-dark, #111315);
  --sig-text-primary: var(--wp--preset--color--text-primary, #181A1B);
  --sig-text-secondary: var(--wp--preset--color--text-secondary, #596475);
  --sig-text-muted: var(--wp--preset--color--text-muted, #8C96A5);
  --sig-accent: var(--wp--preset--color--accent, #2563EB);
  --sig-accent-hover: var(--wp--preset--color--accent-hover, #1D4ED8);
  --sig-accent-tint: var(--wp--preset--color--accent-tint, #EFF6FF);
  --sig-border: var(--wp--preset--color--border-color, #E4E2DC);
  --sig-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --sig-font-serif: 'Instrument Serif', Georgia, serif;
  --sig-font-mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;
  --sig-transition-base: all 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ================= ACCESSIBILITY & SKIP LINK ================= */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1.5rem;
  background: var(--sig-accent);
  color: #ffffff !important;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 4px;
  z-index: 99999;
  transition: top 0.2s ease-in-out;
  text-decoration: none;
}
.skip-link:focus {
  top: 1.5rem;
  outline: 3px solid #000000;
}

*:focus-visible {
  outline: 2px solid var(--sig-accent);
  outline-offset: 2px;
}

/* ================= EDITORIAL WORDMARK & LOGO ================= */
.signature-wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--sig-text-primary);
  font-family: var(--sig-font-sans);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  transition: opacity 0.2s ease;
}
.signature-wordmark:hover {
  opacity: 0.85;
}
.signature-wordmark i,
.signature-serif-accent {
  font-family: var(--sig-font-serif);
  font-weight: 400;
  font-style: italic;
  font-size: 1.18em;
  line-height: 1;
}

.signature-avatar-dot {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--sig-border);
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

/* ================= STICKY HEADER ================= */
.signature-site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(248, 247, 244, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--sig-border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.signature-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--wp--preset--layout--wideSize, 1240px);
  margin: 0 auto;
}

/* ================= NAVIGATION & DESKTOP NAV ================= */
.signature-desktop-nav ul {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.signature-desktop-nav a {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--sig-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}
.signature-desktop-nav a:hover,
.signature-desktop-nav .current-menu-item > a {
  color: var(--sig-text-primary);
}

/* ================= MOBILE DRAWER & BURGER ================= */
.signature-burger {
  display: none;
  background: transparent;
  border: 1px solid var(--sig-border);
  border-radius: 6px;
  padding: 0.5rem;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
}
.signature-burger span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--sig-text-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.signature-burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.signature-burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.signature-burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.signature-drawer-scrim {
  position: fixed;
  inset: 0;
  background: rgba(17, 19, 21, 0.45);
  backdrop-filter: blur(4px);
  z-index: 1090;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.signature-drawer-scrim.is-active {
  opacity: 1;
  pointer-events: auto;
}

.signature-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 85%;
  max-width: 380px;
  height: 100vh;
  background: var(--sig-canvas);
  z-index: 1100;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: -10px 0 35px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  padding: 2rem 1.75rem;
  overflow-y: auto;
}
.signature-drawer.is-active {
  transform: translateX(0);
}

.signature-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--sig-border);
  margin-bottom: 2rem;
}
.signature-drawer-close {
  background: transparent;
  border: none;
  font-size: 1.75rem;
  cursor: pointer;
  color: var(--sig-text-primary);
  line-height: 1;
  padding: 0.25rem 0.5rem;
}

.signature-drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.signature-drawer-nav a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--sig-text-primary);
  text-decoration: none;
  padding: 0.35rem 0;
  transition: color 0.2s ease, transform 0.2s ease;
}
.signature-drawer-nav a:hover {
  color: var(--sig-accent);
  transform: translateX(4px);
}

.signature-drawer-footer {
  margin-top: auto;
  padding-top: 2rem;
  border-top: 1px solid var(--sig-border);
}

/* ================= EDITORIAL HERO ================= */
.signature-hero-section {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--sig-border);
}
.signature-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--sig-accent-tint);
  border: 1px solid rgba(37, 99, 235, 0.2);
  color: var(--sig-accent);
  font-family: var(--sig-font-mono);
  font-size: 0.785rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.signature-hero-badge::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sig-accent);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.signature-hero-portrait {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--sig-border);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
  position: relative;
  background: var(--sig-surface);
}

/* ================= CARDS & GRIDS ================= */
.signature-card {
  background: var(--sig-surface);
  border: 1px solid var(--sig-border);
  border-radius: 10px;
  padding: 2rem;
  transition: var(--sig-transition-base);
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.signature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.05);
  border-color: #D3CECE;
}

.signature-card-bordered {
  background: transparent;
  border: 1px solid var(--sig-border);
  border-radius: 8px;
  padding: 1.75rem;
  transition: var(--sig-transition-base);
}
.signature-card-bordered:hover {
  background: var(--sig-surface);
  border-color: var(--sig-accent);
}

.signature-mono-badge,
.signature-tag {
  font-family: var(--sig-font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--sig-surface-subtle);
  color: var(--sig-text-secondary);
  border: 1px solid var(--sig-border);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
}

.signature-status-pill {
  font-family: var(--sig-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  display: inline-block;
}
.signature-status-core {
  background: #DCFCE7;
  color: #166534;
  border: 1px solid #BBF7D0;
}
.signature-status-learning {
  background: #FEF3C7;
  color: #92400E;
  border: 1px solid #FDE68A;
}

/* ================= TIMELINE & JOURNEY ================= */
.signature-timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 1px solid var(--sig-border);
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.signature-timeline-item {
  position: relative;
}
.signature-timeline-dot {
  position: absolute;
  left: -2.35rem;
  top: 0.25rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sig-surface);
  border: 2px solid var(--sig-accent);
}

/* ================= INTERACTIVE FILTER ================= */
.signature-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  align-items: center;
}
.signature-filter-btn {
  background: transparent;
  border: 1px solid var(--sig-border);
  color: var(--sig-text-secondary);
  font-family: var(--sig-font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 1.15rem;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--sig-transition-base);
}
.signature-filter-btn:hover {
  color: var(--sig-text-primary);
  border-color: var(--sig-text-primary);
}
.signature-filter-btn.is-active {
  background: var(--sig-text-primary);
  color: #FFFFFF;
  border-color: var(--sig-text-primary);
}

/* ================= AFFILIATE RESOURCES ================= */
.signature-disclosure-callout {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
  font-size: 0.875rem;
  color: #78350F;
  line-height: 1.55;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.signature-disclosure-callout svg {
  flex-shrink: 0;
  margin-top: 0.15rem;
  color: #D97706;
}

.signature-sponsored-badge {
  font-family: var(--sig-font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: #FEF3C7;
  color: #92400E;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  display: inline-block;
}

.signature-pro-con-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.25rem 0;
  font-size: 0.875rem;
}
.signature-pros, .signature-cons {
  padding: 1rem;
  border-radius: 6px;
}
.signature-pros {
  background: #F0FDF4;
  border: 1px solid #DCFCE7;
}
.signature-cons {
  background: #FEF2F2;
  border: 1px solid #FEE2E2;
}
.signature-pros ul, .signature-cons ul {
  padding-left: 1.25rem;
  margin: 0.5rem 0 0;
}

/* ================= SINGLE POST & READING PROGRESS ================= */
.signature-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--sig-accent);
  width: 0%;
  z-index: 9999;
  transition: width 0.1s linear;
}

.signature-article-hero {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--sig-border);
  margin-bottom: 3rem;
}

.signature-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--sig-text-secondary);
  font-family: var(--sig-font-mono);
}

.signature-share-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--sig-border);
  border-bottom: 1px solid var(--sig-border);
  margin: 3rem 0;
}
.signature-share-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--sig-text-primary);
}
.signature-share-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--sig-text-secondary);
  border: 1px solid var(--sig-border);
  padding: 0.35rem 0.75rem;
  border-radius: 5px;
  text-decoration: none;
  transition: var(--sig-transition-base);
}
.signature-share-link:hover {
  background: var(--sig-surface);
  color: var(--sig-accent);
  border-color: var(--sig-accent);
}

/* ================= FOOTER ================= */
.signature-site-footer {
  background: var(--sig-surface-dark);
  color: #E2E8F0;
  border-top: 1px solid var(--sig-border-dark, #26292D);
  padding: 4.5rem 0 2.5rem;
}
.signature-site-footer a {
  color: #94A3B8;
  text-decoration: none;
  transition: color 0.2s ease;
}
.signature-site-footer a:hover {
  color: #FFFFFF;
}

/* ================= RESPONSIVE ================= */
@media (max-width: 900px) {
  .signature-desktop-nav,
  .signature-header-cta {
    display: none !important;
  }
  .signature-burger {
    display: flex !important;
  }
  .signature-pro-con-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}