/* ============================================================
   TechStore — Layout
   ============================================================ */

/* ── Container ── */
.container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 500;
  height: 72px;
  background-color: rgba(248, 247, 244, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-8);
}

/* ── Logo ── */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.logo__mark {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo__mark svg {
  width: 18px;
  height: 18px;
  fill: #fff;
}

.logo__text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
}

.logo__text em {
  font-style: normal;
  color: var(--color-accent);
}

/* ── Desktop Nav ── */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}

.nav-desktop a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav-desktop a svg {
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.nav-desktop a:hover { color: var(--color-text-primary); background-color: var(--color-surface-alt); }
.nav-desktop a:hover svg { opacity: 1; }
.nav-desktop a.active { color: var(--color-accent); background-color: var(--color-accent-light); font-weight: 600; }
.nav-desktop a.active svg { opacity: 1; }

/* ── Header Actions ── */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ── Cart Button ── */
.cart-icon-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  border: 1px solid var(--color-border);
}

.cart-icon-btn:hover {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.cart-icon-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

#cart-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  min-width: 20px;
  height: 20px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 10px;
  font-weight: 800;
  border-radius: var(--radius-full);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
  line-height: 1;
  border: 2px solid var(--color-bg);
  animation: badge-pop 0.3s var(--transition-spring);
}

@keyframes badge-pop {
  from { transform: scale(0); }
  to   { transform: scale(1); }
}

/* ── Burger ── */
.burger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  cursor: pointer;
  border: 1px solid var(--color-border);
  padding: 0;
  transition: background-color var(--transition-fast);
}

.burger-btn:hover { background-color: var(--color-border); }

.burger-btn span {
  display: block;
  width: 18px;
  height: 1.5px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
}

.burger-btn span:nth-child(2) { width: 12px; }

.burger-btn.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); width: 18px; }
.burger-btn.open span:nth-child(2) { opacity: 0; }
.burger-btn.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); width: 18px; }

/* ── Mobile Nav ── */
.nav-mobile { display: none; }

.nav-drawer {
  position: fixed;
  top: 72px;
  right: 0;
  width: 300px;
  height: calc(100vh - 72px);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-xl);
  z-index: 490;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  padding: var(--space-4) var(--space-4) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  overflow-y: auto;
  border-left: 1px solid var(--color-border);
}

.nav-drawer--open { transform: translateX(0); }

.nav-drawer__header {
  padding: var(--space-3) var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-3);
}

.nav-drawer__header .logo__text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
}

.nav-drawer__header .logo__text em {
  font-style: normal;
  color: var(--color-accent);
}

.nav-drawer a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-drawer a svg { color: var(--color-text-muted); flex-shrink: 0; }

.nav-drawer a:hover, .nav-drawer a.active {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.nav-drawer a:hover svg, .nav-drawer a.active svg { color: var(--color-accent); }

.nav-drawer__footer {
  margin-top: auto;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  letter-spacing: 0.05em;
}

/* ── Header Search ── */
.header__search { position: relative; }

.header__search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header__search-btn:hover {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.header__search-btn svg {
  width: 18px; height: 18px;
  stroke: currentColor; fill: none;
  stroke-width: 1.75;
}

.header__search-expanded {
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  box-shadow: var(--shadow-md);
  z-index: 400;
  animation: slideDown 0.2s ease forwards;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.search-expanded__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-border-dark);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-5);
  transition: border-color var(--transition-fast);
}

.search-expanded__inner:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.search-expanded__inner svg {
  width: 18px; height: 18px;
  stroke: var(--color-text-muted); fill: none;
  stroke-width: 1.75; flex-shrink: 0;
}

.search-expanded__inner input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  outline: none;
}

.search-expanded__inner input::placeholder { color: var(--color-text-muted); }

/* ── Product Grid ── */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* ── Section ── */
.section { padding: var(--space-20) 0; }
.section--alt { background-color: var(--color-surface-alt); }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-label::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ── Footer ── */
.footer {
  background-color: var(--color-text-primary);
  color: #fff;
  padding: var(--space-20) 0 var(--space-10);
  margin-top: var(--space-20);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer__brand .logo__text { color: #fff; }
.footer__brand .logo__text em { color: var(--color-accent); }

.footer__brand p {
  color: rgba(255,255,255,0.5);
  font-size: var(--font-size-sm);
  margin-top: var(--space-4);
  line-height: 1.7;
  max-width: 280px;
}

.footer__heading {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-5);
}

.footer__links { display: flex; flex-direction: column; gap: var(--space-3); }

.footer__links a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__links a:hover { color: #fff; }

.footer__divider {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin: 0 0 var(--space-8);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.3);
}

.footer__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.4);
  border: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

/* ── Responsive ── */
@media (min-width: 640px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
}

@media (min-width: 768px) {
  .container { padding-left: var(--space-8); padding-right: var(--space-8); }
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .footer__grid { grid-template-columns: 2fr 1fr 1fr; }
  .burger-btn { display: none !important; }
  .nav-desktop { display: flex; }
  .nav-mobile { display: none; }
}

@media (min-width: 1024px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
  .footer__grid { grid-template-columns: 2.5fr 1fr 1fr 1fr; }
}

@media (min-width: 1280px) {
  .product-grid--4 { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 767px) {
  .nav-desktop { display: none; }
  .nav-mobile { display: flex; }
  .burger-btn { display: flex; }
  .section { padding: var(--space-14) 0; }
}