/* navbar.css — Shared sticky navbar with glassmorphism */

.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

/* 2px gradient accent line on top */
.navbar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-nav-accent);
}

/* Reading progress bar below navbar */
.nav-progress-bar,
#nav-progress {
  position: absolute;
  bottom: 0; left: 0;
  height: 2px;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 0.1s linear;
}

.navbar.scrolled {
  height: 56px;
  background: var(--glass-bg);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-mark {
  width: 34px; height: 34px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-sm);
  color: #fff;
  letter-spacing: -0.5px;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  flex-wrap: nowrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  white-space: nowrap;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  background: var(--glass-bg-light);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

/* special highlight link */
.nav-links a.nav-highlight {
  color: var(--color-primary);
  font-weight: 700;
}

/* ─── Alias: .nav-link (used by sub-pages) ────────────────────────────────── */
/* Sub-pages style links as .nav-link instead of .nav-links a */
.nav-link {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
  display: block;
}
.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background: var(--glass-bg-light);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
}
/* .nav-logo-accent — colored accent in logo text */
.nav-logo-accent {
  color: var(--color-primary);
  -webkit-text-fill-color: var(--color-primary);
}
/* .theme-toggle — alias for .nav-btn used by sub-pages */
.theme-toggle {
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.theme-toggle:hover {
  background: var(--color-primary-dim);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Nav right actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav-btn {
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  background: var(--color-primary-dim);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  width: 36px; height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border);
  color: var(--color-text-muted);
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.nav-hamburger span {
  display: block;
  width: 18px; height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* Mobile overlay */
.nav-mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
}

.nav-mobile-drawer {
  position: fixed;
  top: 0; right: -100%;
  width: min(320px, 85vw);
  height: 100vh;
  background: var(--color-surface);
  border-left: 1px solid var(--glass-border);
  z-index: 1001;
  transition: right var(--transition-slow);
  padding: var(--space-16) var(--space-6) var(--space-8);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav-mobile-drawer.open { right: 0; }
.nav-mobile-overlay.open { display: block; }

.nav-mobile-drawer a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-base);
  font-weight: 500;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  display: block;
  transition: all var(--transition-fast);
}

.nav-mobile-drawer a:hover,
.nav-mobile-drawer a.active {
  background: var(--color-primary-dim);
  color: var(--color-primary);
}

.nav-mobile-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 18px;
}

/* Section progress dots (right side) */
.section-dots {
  position: fixed;
  right: var(--space-6);
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.section-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.section-dot:hover,
.section-dot.active {
  background: var(--color-primary);
  border-color: var(--color-primary-glow);
  box-shadow: 0 0 8px var(--color-primary-glow);
}

.section-dot[data-label]::before {
  content: attr(data-label);
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.section-dot:hover::before { opacity: 1; }

/* Scroll-to-top button */
.scroll-top-btn {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 100;
  width: 44px; height: 44px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: #fff;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  border: none;
  font-size: 18px;
  transition: all var(--transition-fast);
}

.scroll-top-btn.visible { display: flex; }
.scroll-top-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow-cyan); }

/* Toast notifications */
.toast-container {
  position: fixed;
  top: calc(var(--nav-height) + var(--space-4));
  right: var(--space-6);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  background: var(--color-surface-2);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 280px;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideInToast 0.3s ease;
  backdrop-filter: var(--glass-blur);
}

.toast.warning { border-left: 3px solid var(--color-warning); }
.toast.success { border-left: 3px solid var(--color-success); }
.toast.error   { border-left: 3px solid var(--color-error); }
.toast.info    { border-left: 3px solid var(--color-info); }

@keyframes slideInToast {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* Alarm panel */
.alarm-panel {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: flex-end;
}

.alarm-panel.open { display: flex; }

.alarm-panel-bg {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
}

.alarm-panel-drawer {
  position: relative;
  z-index: 1;
  width: min(380px, 90vw);
  height: 100vh;
  background: var(--color-surface);
  border-left: 1px solid var(--glass-border);
  padding: var(--space-8) var(--space-6);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* Shortcut help modal */
.shortcut-help {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
}

.shortcut-help.open { display: flex; }

.shortcut-help-card {
  background: var(--color-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  width: min(480px, 90vw);
  box-shadow: var(--shadow-lg);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .section-dots { display: none; }
}

/* ─── Responsive: Medium screens (960px) ─────────────────────────────────── */
@media (max-width: 960px) and (min-width: 769px) {
  .nav-links {
    gap: 0;
  }
  .nav-links a {
    font-size: 0.75rem;
    padding: var(--space-1) var(--space-2);
  }
}

/* ─── Responsive: Hamburger kicks in at 960px (was 768px) ───────────────── */
@media (max-width: 960px) {
  .nav-links { display: none !important; }
  .nav-hamburger { display: flex !important; }
  .section-dots { display: none; }
}

/* Override the old 768px rule so it doesn't conflict */
@media (min-width: 769px) and (max-width: 960px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
}