/* Asadin Edu Physics · Layout & Navigation Styles */

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1;
  padding-top: var(--nav-height);
  width: 100%;
}

.content-wrap {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================================
   GLOBAL NAVBAR
   ======================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(8, 11, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.4));
  transition: transform var(--trans-smooth);
}

.brand-link:hover .brand-logo-img {
  transform: rotate(15deg) scale(1.05);
}

.brand-title-box {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, #ffffff 40%, var(--cyan-bright) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--trans-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.nav-link.active {
  color: var(--cyan-bright);
  background: rgba(0, 242, 254, 0.1);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Quick Search Button */
.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--trans-fast);
}

.search-trigger-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 242, 254, 0.4);
  color: var(--text-primary);
}

.search-kbd {
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

/* Mode Switcher Pill (EXPLORE vs LEARN) */
.mode-toggle-group {
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.4);
  padding: 3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.mode-btn {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  transition: all var(--trans-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.mode-btn.active {
  background: var(--cyan-bright);
  color: #05070e;
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.4);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ========================================================
   GLOBAL FOOTER
   ======================================================== */
.site-footer {
  margin-top: 80px;
  background: #04060a;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.6;
  max-width: 380px;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: color var(--trans-fast);
}

.footer-list a:hover {
  color: var(--cyan-bright);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.82rem;
  color: var(--text-muted);
}