/* ============================================================
   AQOON TECH  —  Layout & Forms  (css/layout.css)
   Grid system, article+sidebar layout, search bar,
   filter bar, forms, newsletter section, footer
   ============================================================ */

/* ════════════════════════════
   GRID SYSTEM
════════════════════════════ */
.grid       { display: grid; gap: var(--s6); }
.grid-2     { grid-template-columns: repeat(2,1fr); }
.grid-3     { grid-template-columns: repeat(3,1fr); }
.grid-4     { grid-template-columns: repeat(4,1fr); }
.gap-sm     { gap: var(--s4); }
.gap-md     { gap: var(--s5); }
.gap-lg     { gap: var(--s8); }

/* ── Section header row ── */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: var(--s4);
  margin-bottom: var(--s10);
}
.section-header.center {
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* ── Article + Sidebar ── */
.content-sidebar {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 3rem;
  align-items: start;
}

/* ── Article TOC layout ── */
.article-toc-layout {
  display: grid;
  grid-template-columns: 1fr 295px;
  gap: 3rem;
  align-items: start;
}

/* ── Sticky sidebar ── */
.sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: var(--s5);
}

/* ── TOC list ── */
.toc-list { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.toc-list a {
  display: block;
  font-family: var(--font-ui);
  font-size: 12.5px;
  color: var(--text-3);
  text-decoration: none;
  padding: 5px 10px;
  border-radius: var(--r-xs);
  border-left: 2px solid transparent;
  transition: all var(--t) var(--ease);
}
.toc-list a:hover {
  color: var(--blue);
  background: var(--blue-light);
  border-left-color: var(--blue);
  padding-left: 14px;
}
[data-theme="dark"] .toc-list a:hover { background: rgba(74,144,217,.08); }
.toc-list a.active {
  color: var(--blue);
  border-left-color: var(--blue);
  font-weight: 600;
}

/* ════════════════════════════
   SEARCH
════════════════════════════ */
.search-wrap { position: relative; }

.search-bar {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r);
  overflow: visible; /* let dropdown escape */
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.search-bar:focus-within {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(74,144,217,.12);
}
.search-icon  { padding: 0 var(--s4); color: var(--text-3); font-size: 17px; pointer-events: none; flex-shrink: 0; }
.search-input {
  flex: 1;
  padding: 14px 0;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: var(--size-sm);
  outline: none;
}
.search-input::placeholder { color: var(--text-3); }
.search-kbd {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-3);
  border: 1px solid var(--border-2);
  border-radius: 5px;
  padding: 2px 8px;
  margin-right: var(--s4);
  background: var(--bg-alt);
  white-space: nowrap;
  flex-shrink: 0;
}

.search-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  box-shadow: var(--shadow-md);
  z-index: var(--z-drop);
  overflow: hidden;
}
.search-dropdown.open { display: block; animation: fadeUp .15s var(--ease-out) both; }

.search-result {
  padding: var(--s3) var(--s4);
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--s3);
  transition: background var(--t) var(--ease);
  text-decoration: none;
  color: inherit;
}
.search-result:last-child { border-bottom: none; }
.search-result:hover { background: var(--blue-light); }
[data-theme="dark"] .search-result:hover { background: rgba(74,144,217,.08); }
.search-result-icon {
  width: 34px; height: 34px;
  border-radius: var(--r-sm);
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}
[data-theme="dark"] .search-result-icon { background: rgba(74,144,217,.10); }
.search-result-cat   { font-family: var(--font-ui); font-size: 10px; font-weight: 700; color: var(--blue); letter-spacing: .5px; text-transform: uppercase; margin-bottom: 2px; }
.search-result-title { font-size: 13px; color: var(--text); }

/* ════════════════════════════
   FILTER BAR
════════════════════════════ */
.filter-bar {
  display: flex;
  gap: var(--s2);
  flex-wrap: wrap;
  margin-bottom: var(--s8);
}
.filter-btn {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: var(--r-full);
  border: 1.5px solid var(--border-2);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--t) var(--ease);
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  box-shadow: 0 4px 12px rgba(74,144,217,.25);
}

/* ════════════════════════════
   FORMS
════════════════════════════ */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s4);
}
.form-group { margin-bottom: var(--s5); }
.form-label {
  display: block;
  font-family: var(--font-ui);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: var(--s2);
  letter-spacing: .2px;
}
.form-input {
  width: 100%;
  padding: 13px var(--s4);
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  font-size: var(--size-sm);
  outline: none;
  -webkit-appearance: none;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.form-input:focus {
  border-color: var(--blue);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(74,144,217,.10);
}
.form-input::placeholder { color: var(--text-3); }
.form-textarea { min-height: 135px; resize: vertical; }
.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238892A8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

/* ════════════════════════════
   NEWSLETTER SECTION
════════════════════════════ */
.newsletter-section {
  background: var(--charcoal);
  padding: clamp(4rem,8vw,7rem) var(--pad-x);
  position: relative;
  overflow: hidden;
}
[data-theme="dark"] .newsletter-section { background: #08090f; }
.newsletter-section::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74,144,217,.14) 0%, transparent 70%);
  right: -100px; top: -150px;
  pointer-events: none;
}
.newsletter-section::after {
  content: '';
  position: absolute;
  width: 350px; height: 350px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74,144,217,.10) 0%, transparent 70%);
  left: -50px; bottom: -80px;
  pointer-events: none;
}
.newsletter-inner {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}
.newsletter-emoji { font-size: 2.8rem; margin-bottom: var(--s4); display: block; }
.newsletter-inner h2 {
  font-family: var(--font-brand);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  color: #fff;
  margin-bottom: var(--s3);
  line-height: 1.25;
}
.newsletter-inner p { font-size: 15px; color: rgba(255,255,255,.55); margin-bottom: var(--s6); line-height: 1.7; }
.newsletter-form {
  display: flex;
  gap: var(--s2);
  max-width: 480px;
  margin: 0 auto;
}
.newsletter-input {
  flex: 1;
  padding: 14px var(--s5);
  border-radius: var(--r);
  border: 1.5px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.07);
  color: #fff;
  font-size: var(--size-sm);
  outline: none;
  transition: border-color var(--t) var(--ease);
}
.newsletter-input::placeholder { color: rgba(255,255,255,.38); }
.newsletter-input:focus { border-color: var(--blue); }
.newsletter-submit {
  padding: 14px var(--s6);
  border-radius: var(--r);
  border: none;
  background: var(--blue);
  color: #fff;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--t) var(--ease-spring);
}
.newsletter-submit:hover { background: var(--blue-dark); transform: translateY(-1px); }

/* ════════════════════════════
   FOOTER
════════════════════════════ */
.site-footer {
  background: var(--charcoal);
  padding: clamp(3rem,6vw,5rem) var(--pad-x) 0;
}
[data-theme="dark"] .site-footer { background: #06070d; }

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand-row { display: flex; align-items: center; gap: 11px; margin-bottom: var(--s5); }
.footer-logo-icon {
  width: 42px; height: 42px;
  background: var(--blue);
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.footer-logo-icon svg { width: 22px; height: 22px; }
.footer-brand-name { font-family: var(--font-brand); font-size: 17px; color: #fff; display: block; }
.footer-brand-name span { color: var(--blue); }
.footer-brand-tag  { font-family: var(--font-ui); font-size: 9px; letter-spacing: 2.5px; text-transform: uppercase; color: rgba(255,255,255,.38); display: block; }
.footer-about { font-size: 13.5px; color: rgba(255,255,255,.42); line-height: 1.8; margin-bottom: var(--s5); max-width: 300px; }
.social-links { display: flex; gap: var(--s2); }
.social-btn {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.50);
  font-size: 14px;
  text-decoration: none;
  transition: all var(--t) var(--ease-spring);
}
.social-btn:hover { background: var(--blue); border-color: var(--blue); color: #fff; transform: translateY(-2px); }

.footer-col-title { font-family: var(--font-brand); font-size: 13px; color: #fff; margin-bottom: var(--s5); letter-spacing: .3px; }
.footer-links { display: flex; flex-direction: column; gap: var(--s3); }
.footer-links a { font-size: 13.5px; color: rgba(255,255,255,.42); text-decoration: none; transition: color var(--t) var(--ease); }
.footer-links a:hover { color: var(--blue); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s2);
  padding: var(--s5) 0;
  font-family: var(--font-ui);
  font-size: 12px;
  color: rgba(255,255,255,.25);
}
.footer-bottom a { color: rgba(255,255,255,.38); text-decoration: none; transition: color var(--t) var(--ease); }
.footer-bottom a:hover { color: var(--blue); }

/* ── Back to top ── */
.back-to-top {
  position: fixed;
  bottom: 30px; right: 30px;
  z-index: var(--z-sticky);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-blue);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all var(--t) var(--ease-spring);
}
.back-to-top.visible { opacity: 1; pointer-events: all; transform: translateY(0); }
.back-to-top:hover   { transform: translateY(-3px) scale(1.06); }

/* ── Page hero band (light) ── */
.page-band {
  padding: clamp(3.5rem,7vw,6rem) var(--pad-x) clamp(2rem,4vw,3.5rem);
  background: linear-gradient(180deg, var(--blue-light) 0%, var(--bg) 100%);
  position: relative;
  overflow: hidden;
  text-align: center;
}
[data-theme="dark"] .page-band {
  background: linear-gradient(180deg, rgba(74,144,217,.07) 0%, var(--bg) 100%);
}
.page-band::before {
  content: '';
  position: absolute;
  top: -50%; left: 50%;
  transform: translateX(-50%);
  width: 900px; height: 900px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74,144,217,.10) 0%, transparent 60%);
  pointer-events: none;
}
.page-band .container { position: relative; z-index: 1; }

/* ── Dark hero band ── */
.hero-band-dark {
  padding: clamp(4rem,8vw,7rem) var(--pad-x) clamp(3rem,6vw,5rem);
  background: linear-gradient(135deg, var(--charcoal) 0%, #1a2040 100%);
  position: relative;
  overflow: hidden;
  text-align: center;
}
[data-theme="dark"] .hero-band-dark { background: linear-gradient(135deg, #0c0e1a 0%, #141830 100%); }
.hero-band-dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 60% 30%, rgba(74,144,217,.18) 0%, transparent 60%);
  pointer-events: none;
}
.hero-band-dark .container { position: relative; z-index: 1; }

/* ── Stats strip ── */
.stats-strip {
  background: var(--charcoal);
  padding: var(--s10) var(--pad-x);
  position: relative;
  overflow: hidden;
}
[data-theme="dark"] .stats-strip { background: #08090f; }
.stats-strip::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(74,144,217,.06) 0%, transparent 55%);
  pointer-events: none;
}
.stats-inner {
  max-width: var(--max-w-sm);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: var(--s6);
  position: relative; z-index: 1;
}
.stat-item   { text-align: center; }
.stat-num    { font-family: var(--font-brand); font-size: clamp(2rem,3.5vw,2.8rem); color: var(--blue); line-height: 1; margin-bottom: var(--s2); letter-spacing: -.5px; }
.stat-label  { font-family: var(--font-ui); font-size: 12px; color: rgba(255,255,255,.5); font-weight: 500; letter-spacing: .5px; }

/* ════════════════════════════
   SHARE ROW
════════════════════════════ */
.share-row {
  display: flex;
  gap: var(--s2);
  flex-wrap: wrap;
  align-items: center;
  margin-top: var(--s8);
  padding-top: var(--s6);
  border-top: 1px solid var(--border);
}
.share-btn {
  font-family: var(--font-ui);
  font-size: var(--size-sm);
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border-2);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--t) var(--ease);
}
.share-btn:hover       { transform: translateY(-1px); }
.share-btn.whatsapp:hover  { background: #25D366; color: #fff; border-color: #25D366; box-shadow: 0 4px 12px rgba(37,211,102,.3); }
.share-btn.telegram:hover  { background: #2AABEE; color: #fff; border-color: #2AABEE; box-shadow: 0 4px 12px rgba(42,171,238,.3); }
.share-btn.facebook:hover  { background: #1877F2; color: #fff; border-color: #1877F2; }
.share-btn.twitter:hover   { background: #1DA1F2; color: #fff; border-color: #1DA1F2; }
.share-btn.copy:hover      { background: var(--charcoal); color: #fff; border-color: var(--charcoal); }

/* ════════════════════════════
   RESPONSIVE
════════════════════════════ */
@media (max-width: 1100px) {
  .footer-grid          { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .content-sidebar      { grid-template-columns: 1fr; }
  .article-toc-layout   { grid-template-columns: 1fr; }
  .sidebar              { display: none; }
}
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .grid-3 { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
  .newsletter-form { flex-direction: column; }
  .footer-grid     { grid-template-columns: 1fr; gap: 1.75rem; }
  .form-row        { grid-template-columns: 1fr; }
  .grid-2          { grid-template-columns: 1fr; }
  .stats-inner     { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 580px) {
  .grid-4 { grid-template-columns: repeat(2,1fr); gap: var(--s3); }
  .grid-3 { grid-template-columns: 1fr; }
  .share-row { flex-direction: column; align-items: flex-start; }
}