/* ================================================================
   NAVIGATION
   ================================================================ */
.nav {
  position: sticky; top: 0; z-index: 100; background: var(--primary);
  padding: 0 24px; box-shadow: 0 2px 12px rgba(0,102,204,0.15);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto; display: flex;
  align-items: center; height: 58px; gap: 0;
}

/* Row wrappers (for mobile layout) */
.nav-row-1 {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
}

.nav-row-2 {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-duck {
  width: 38px; height: 38px; object-fit: contain; margin-right: 10px;
  flex-shrink: 0; cursor: pointer; transition: transform 0.3s ease;
  filter: brightness(0) invert(1);
}
.nav-duck:hover { 
  transform: rotate(-8deg) scale(1.15); 
  animation: wiggle 0.5s ease;
}
@keyframes wiggle {
  0%, 100% { transform: rotate(0deg) scale(1.15); }
  25% { transform: rotate(-10deg) scale(1.15); }
  75% { transform: rotate(10deg) scale(1.15); }
}
.nav-brand {
  font-family: var(--font-display); font-size: 15px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.06em; color: #fff;
  margin-right: 24px; white-space: nowrap;
}
.nav-brand span { color: var(--accent); }

/* Desktop Week Links */
.nav-links-desktop {
  display: flex; gap: 20px; overflow-x: auto;
  scrollbar-width: none; flex: 1;
}
.nav-links-desktop::-webkit-scrollbar { display: none; }

.nav-link {
  background: none; border: none; color: rgba(255,255,255,0.6);
  font-family: var(--font-body); font-size: 14px; font-weight: 500;
  padding: 7px 13px; border-radius: 8px; cursor: pointer;
  white-space: nowrap; transition: color 0.2s, background 0.2s;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.1); }
.nav-link.active { color: var(--accent); background: rgba(255,149,0,0.15); }

/* SRS button styling */
.nav-srs-btn {
  color: var(--gold);
}

/* ================================================================
   MOBILE TAB BAR (Bottom Navigation) - DISABLED
   ================================================================ */

.nav-mobile-tabs {
  display: none !important;
}

.nav-tab-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 70px;
  height: 56px;
  padding: 0 12px;
  background: none;
  border: none;
  color: rgba(255,255,255,0.6);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
  position: relative;
  flex-shrink: 0;
}

.nav-tab-link:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.nav-tab-link.active {
  color: var(--accent);
  background: rgba(255,149,0,0.12);
  border-bottom: 3px solid var(--accent);
}

/* ================================================================
   RESPONSIVE ADJUSTMENTS
   ================================================================ */

/* Tablet: 600px - 900px - KEEP DESKTOP LAYOUT */
@media (max-width: 900px) and (min-width: 601px) {
  .nav {
    padding: 0 16px;
  }
  .nav-inner {
    height: 54px;
  }

  .nav-row-1 {
    flex: 1;
  }

  .nav-row-2 {
    gap: 10px;
  }

  .nav-duck {
    width: 32px;
    height: 32px;
    margin-right: 8px;
  }
  .nav-brand {
    font-size: 13px;
    margin-right: 16px;
  }
  .nav-links-desktop {
    gap: 12px;
  }
  .nav-link {
    font-size: 13px;
    padding: 6px 11px;
  }
  .nav-srs-btn {
    padding: 4px 8px;
    font-size: 12px;
  }
  #streakDisplay {
    font-size: 12px;
  }
  #syncTip {
    padding: 4px 8px;
  }
}

/* Mobile: unter 600px - 2-ROW ELEGANT LAYOUT */
@media (max-width: 600px) {
  body {
    padding-bottom: 0;
  }

  .nav {
    padding: 12px 12px;
  }
  
  .nav-inner {
    height: auto;
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }

  /* ROW 1: Brand + Week Links */
  .nav-row-1 {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    flex-wrap: nowrap;
  }

  .nav-brand {
    font-size: 12px;
    margin-right: 8px;
    letter-spacing: 0.04em;
    flex-shrink: 0;
    white-space: nowrap;
  }

  .nav-links-desktop {
    display: flex !important;
    gap: 5px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex: 1;
    min-width: 0;
  }

  .nav-link {
    font-size: 11px;
    padding: 5px 8px;
    min-height: 40px;
    display: flex;
    align-items: center;
    flex-shrink: 0;
    white-space: nowrap;
  }

  /* ROW 2: Tools (Wiederholen + Streak + Code) */
  .nav-row-2 {
    display: flex;
    align-items: stretch;
    justify-content: space-around;
    gap: 6px;
  }

  .nav-srs-btn {
    display: flex !important;
    flex: 1;
    padding: 7px 6px;
    font-size: 11px;
    justify-content: center;
    align-items: center;
    min-height: 40px;
  }

  .nav-srs-btn span:first-of-type {
    font-size: 11px;
  }

  #streakDisplay {
    font-size: 11px;
    min-width: 30px;
    text-align: center;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #syncTip {
    display: flex !important;
    flex: 1;
    padding: 7px 6px;
    gap: 3px;
    justify-content: center;
    align-items: center;
    min-height: 40px;
  }
  
  #syncTip span {
    font-size: 10px !important;
  }

  .nav-mobile-tabs {
    display: none !important;
  }
}