*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-navy);
  background: var(--color-offwhite);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.3;
  font-weight: 600;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.875rem;
  border: none;
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  transition: all var(--transition);
}

input, textarea, select {
  font-family: var(--font-body);
  font-size: 1rem;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  outline: none;
  transition: border-color var(--transition);
  max-width: 100%;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--color-accent);
}

/* Layout */
#app-container {
  display: none;
  min-height: 100vh;
}

#app-container.visible {
  display: flex;
  flex-direction: column;
}

/* ===== Top Nav ===== */
.top-nav {
  background: var(--color-navy);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 var(--space-md);
}

.nav-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.top-nav .logo {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-gold);
  white-space: nowrap;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gray-200);
  border-radius: 1px;
  transition: all 0.25s ease;
}
.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Nav collapse container */
.nav-collapse {
  display: flex;
  align-items: center;
  flex: 1;
  margin-left: var(--space-xl);
}

.top-nav .nav-links {
  display: flex;
  gap: var(--space-xs);
  list-style: none;
  flex: 1;
}

.top-nav .nav-links a {
  color: var(--color-gray-200);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.top-nav .nav-links a:hover {
  color: var(--color-white);
  background: var(--color-navy-light);
  text-decoration: none;
}

.top-nav .nav-links a.active {
  color: var(--color-gold);
  background: var(--color-navy-light);
}

.top-nav .nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.top-nav .btn-panel-toggle {
  background: var(--color-navy-light);
  color: var(--color-gray-200);
  border: 1px solid var(--color-gray-500);
  padding: 6px 12px;
  font-size: 0.8rem;
}
.top-nav .btn-panel-toggle:hover {
  color: var(--color-white);
  border-color: var(--color-gold);
}

.btn-logout {
  background: transparent;
  color: var(--color-gray-300);
  font-size: 0.8rem;
  padding: 6px 12px;
}
.btn-logout:hover {
  color: var(--color-danger);
}

/* ===== Main content area ===== */
.main-content {
  flex: 1;
  padding: var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  transition: margin-right var(--transition);
}

body.panel-open .main-content {
  margin-right: var(--sidebar-width);
}

/* Card */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-gray-100);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.card-header h2 {
  font-size: 1.25rem;
}

/* Buttons */
.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}
.btn-primary:hover {
  background: var(--color-accent-light);
}

.btn-secondary {
  background: var(--color-gray-100);
  color: var(--color-navy);
}
.btn-secondary:hover {
  background: var(--color-gray-200);
}

.btn-success {
  background: var(--color-success);
  color: var(--color-white);
}

.btn-danger {
  background: var(--color-danger);
  color: var(--color-white);
}
.btn-danger:hover {
  opacity: 0.9;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.75rem;
}

/* Toast notifications */
.toast-container {
  position: fixed;
  top: 70px;
  right: 12px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: calc(100vw - 24px);
}

.toast {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-size: 0.85rem;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s;
  max-width: 360px;
  word-break: break-word;
}
.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-danger); }
.toast.info { background: var(--color-accent); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* Badge */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
}
.badge-highlight { background: var(--color-highlight-yellow); color: #92400e; }
.badge-rewrite { background: var(--color-highlight-red); color: #991b1b; }
.badge-comment { background: var(--color-highlight-blue); color: #1e40af; }
.badge-pending { background: var(--color-warning); color: var(--color-white); }
.badge-open { background: var(--color-accent); color: var(--color-white); }

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--color-gray-200);
  border-radius: 3px;
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-gray-200);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===========================
   RESPONSIVE: Tablet (<=900px)
   =========================== */
@media (max-width: 900px) {
  .main-content {
    padding: var(--space-md);
  }

  body.panel-open .main-content {
    margin-right: 0;
  }

  .card {
    padding: var(--space-md);
  }

  .card-header h2 {
    font-size: 1.1rem;
  }
}

/* ===========================
   RESPONSIVE: Mobile (<=640px)
   =========================== */
@media (max-width: 640px) {
  html {
    font-size: 15px;
  }

  /* Hamburger visible */
  .hamburger {
    display: flex;
  }

  /* Stack nav vertically */
  .nav-collapse {
    display: none;
    flex-direction: column;
    align-items: stretch;
    margin-left: 0;
    padding-bottom: var(--space-md);
  }

  .nav-collapse.open {
    display: flex;
  }

  .top-nav {
    padding: 0 var(--space-md);
  }

  .top-nav .nav-links {
    flex-direction: column;
    gap: 0;
    margin-bottom: var(--space-sm);
  }

  .top-nav .nav-links a {
    display: block;
    padding: 10px var(--space-md);
    font-size: 0.9rem;
    border-radius: 0;
    border-bottom: 1px solid var(--color-navy-light);
  }

  .top-nav .nav-right {
    justify-content: center;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-navy-light);
  }

  .main-content {
    padding: var(--space-sm);
  }

  .card {
    padding: var(--space-md);
    border-radius: var(--radius-sm);
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .card-header h2 {
    font-size: 1rem;
  }

  .modal {
    margin: var(--space-md);
    max-width: calc(100vw - 32px);
  }
}