/* ============================================
   LAYOUT.CSS — App Shell (Minimal & Robust)
   ============================================ */

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================
   1. TOP NAVIGATION
   ============================================ */
.top-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: grid;
  grid-template-columns: 
    minmax(200px, 1.5fr)  /* Part 1: Logo */
    auto                   /* Part 2: Public Links OR Auth Menus */
    1fr                    /* Part 3: Mode Tabs */
    auto                   /* Part 4: Theme + Actions */
  ;
  align-items: center;
  height: 56px;
  padding: 0 var(--space-4);
  background: var(--surface);
  border-bottom: 2px solid var(--primary);
  user-select: none;
  gap: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.nav-part-1 { display: flex; align-items: center; gap: var(--space-3); }
.logo-container { display: flex; align-items: center; gap: var(--space-2); }
.logo { width: 32px; height: 32px; object-fit: contain; }
.app-name {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

/* Public Nav Links */
.nav-public-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-link:hover { color: var(--primary); }

/* Auth Menus */
.nav-auth-menus { display: flex; align-items: center; gap: var(--space-2); }
.nav-dropdown { position: relative; }

.nav-btn {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent; border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm); font-weight: var(--font-medium);
  cursor: pointer; transition: all var(--transition-fast);
}

#publicAuthButtons{ display: flex; align-items: center; gap: var(--space-2); }

.nav-btn:hover { background: var(--bg-muted); border-color: var(--border); color: var(--text); }
.dropdown-arrow { font-size: 0.6rem; color: var(--text-muted); transition: transform var(--transition-fast); }
.profile-btn { display: flex; align-items: center; gap: var(--space-2); }
.profile-icon {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-sm); border: 2px solid var(--primary);
}
.profile-name { display: none; }
@media (min-width: 1200px) { .profile-name { display: inline; } }

.dropdown-content {
  position: absolute; top: calc(100% + var(--space-1)); left: 0;
  min-width: 220px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl); padding: var(--space-2);
  z-index: var(--z-dropdown); display: none;
  animation: dropdown-slide-down var(--transition-fast);
}
.dropdown-content.show { display: block; }
.dropdown-content.dropdown-right { left: auto; right: 0; }

@keyframes dropdown-slide-down {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.dropdown-item {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md); color: var(--text);
  font-size: var(--text-sm); cursor: pointer;
  transition: all var(--transition-fast);
}
.dropdown-item:hover { background: linear-gradient(90deg, var(--primary-light) 0%, transparent 100%); color: var(--primary); }
.dropdown-item .icon { font-size: 1.1rem; width: 20px; text-align: center; }
.dropdown-item .shortcut {
  margin-left: auto; font-size: var(--text-xs);
  color: var(--text-subtle); background: var(--bg-muted);
  padding: 2px 6px; border-radius: var(--radius-sm);
}
.dropdown-divider { height: 1px; background: var(--border); margin: var(--space-2) 0; }

/* Mode Tabs */
.nav-part-3 { display: flex; align-items: center; gap: var(--space-1); overflow-x: auto; scrollbar-width: none; }
.nav-part-3::-webkit-scrollbar { display: none; }
.mode-placeholder { display: flex; align-items: center; justify-content: center; color: var(--text-muted); font-size: var(--text-sm); font-style: italic; }
.mode-tabs {
  display: flex; align-items: center; gap: var(--space-1);
  background: var(--bg-muted); padding: var(--space-1);
  border-radius: var(--radius-lg); border: 2px solid var(--primary);
}
.mode-tab {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4); background: transparent; border: none;
  border-radius: var(--radius-md); color: var(--text-secondary);
  font-size: var(--text-sm); font-weight: var(--font-medium);
  cursor: pointer; transition: all var(--transition-fast); white-space: nowrap;
}
.mode-tab:hover { background: var(--bg-strong); color: var(--text); }
.mode-tab.active { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%); color: var(--text-inverse); box-shadow: var(--shadow-md); }
.mode-tab .tab-icon { font-size: 1.1rem; }
.mode-tab .tab-label { display: none; }
@media (min-width: 1400px) { .mode-tab .tab-label { display: inline; } }

/* Theme Toggle */
.nav-part-4 { display: flex; align-items: center; gap: var(--space-2); }
.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; background: var(--bg-muted);
  border: 2px solid var(--border); border-radius: 50%;
  cursor: pointer; transition: all var(--transition-base);
  position: relative; overflow: hidden;
}
.theme-toggle:hover { background: var(--accent-light); border-color: var(--accent); transform: scale(1.05); }
.theme-toggle .sun-icon, .theme-toggle .moon-icon { font-size: 1.2rem; position: absolute; transition: all 0.4s ease; }
.theme-toggle .sun-icon { opacity: 1; transform: rotate(0deg) scale(1); }
.theme-toggle .moon-icon { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="dark"] .theme-toggle .sun-icon { opacity: 0; transform: rotate(90deg) scale(0.5); }
[data-theme="dark"] .theme-toggle .moon-icon { opacity: 1; transform: rotate(0deg) scale(1); }

/* ============================================
   2. PAGE CONTAINERS
   ============================================ */
.landing-main, .page-container, .mode-content { flex: 1; width: 100%; }

.landing-main { display: block; padding: 0; overflow-x: hidden; }

.page-container {
  padding: var(--space-8) var(--space-6);
  max-width: 1400px; width: 100%; margin: 0 auto;
}
.page-header { margin-bottom: var(--space-8); }
.page-header h1 { font-size: var(--text-3xl); color: var(--text); margin-bottom: var(--space-2); }
.page-header p { color: var(--text-secondary); font-size: var(--text-lg); }

.mode-content { display: none; padding: var(--space-6); max-width: 1400px; width: 100%; margin: 0 auto; }
.mode-content:not([hidden]) { display: block; }

/* ============================================
   3. FOOTERS
   ============================================ */
/* Public Footer (Rich) */
.app-footer-public {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: var(--space-12) var(--space-6) var(--space-6);
  margin-top: auto;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: var(--space-12);
  max-width: 1200px;
  margin: 0 auto var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--border);
}

.footer-brand { max-width: 300px; }
.footer-brand .logo-container { margin-bottom: var(--space-4); }
.footer-tagline { font-size: var(--text-sm); color: var(--text-muted); line-height: var(--leading-relaxed); }

.footer-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.footer-col h4 {
  font-size: var(--text-sm); font-weight: var(--font-semibold);
  color: var(--text); margin-bottom: var(--space-4);
  text-transform: uppercase; letter-spacing: var(--tracking-wide);
}

.footer-col a {
  display: block; font-size: var(--text-sm); color: var(--text-secondary);
  text-decoration: none; margin-bottom: var(--space-3);
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--primary); }

.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto;
  font-size: var(--text-xs); color: var(--text-muted);
}

/* Minimal Footer (Dashboard/Workspace) */
.app-footer-minimal {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: var(--space-3) var(--space-6);
  margin-top: auto;
}

.footer-content-minimal {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1400px; margin: 0 auto;
  font-size: var(--text-xs); color: var(--text-muted);
}

.footer-left { display: flex; align-items: center; gap: var(--space-2); }
.logo-sm { width: 20px; height: 20px; object-fit: contain; }
.footer-divider { color: var(--border-strong); }

/* ============================================
   4. RESPONSIVE BREAKPOINTS
   ============================================ */
@media (max-width: 1024px) {
  .top-nav { grid-template-columns: 1fr auto auto; }
  .nav-public-links, .nav-auth-menus { display: none; } /* Simplified for mobile, can add hamburger later */
  .nav-part-3 { display: none; }
  .app-name { font-size: var(--text-base); }
  .profile-name { display: none; }
  .page-container, .mode-content { padding: var(--space-4); }
  
  .footer-main { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer-links-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .top-nav { padding: 0 var(--space-3); gap: var(--space-2); }
  .theme-toggle { width: 36px; height: 36px; }
  .theme-toggle .sun-icon, .theme-toggle .moon-icon { font-size: 1rem; }
  
  .footer-links-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer-bottom { flex-direction: column; gap: var(--space-2); text-align: center; }
  .footer-content-minimal { flex-direction: column; gap: var(--space-2); text-align: center; }
}

@media (min-width: 1401px) {
  .mode-tab .tab-label { display: inline; }
  .profile-name { display: inline; }
}