/* Layout */
.app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar nav */
.sidebar {
  width: 200px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: var(--xl) 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-brand {
  padding: 0 var(--lg);
  margin-bottom: var(--xl);
  font-size: 16px;
  font-weight: 700;
  color: var(--hot-pink);
  letter-spacing: 1px;
}

.sidebar-brand span {
  color: var(--cyan);
  font-weight: 400;
}

.sidebar nav {
  flex: 1;
}

.nav-item {
  display: block;
  padding: var(--sm) var(--lg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
  font-size: 13px;
}

.nav-item:hover {
  color: var(--text-primary);
  background: var(--surface-light);
  text-decoration: none;
}

.nav-item.active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(120, 219, 235, 0.05);
}

/* Main content */
.main {
  margin-left: 200px;
  flex: 1;
  padding: var(--xl) var(--xxl);
  max-width: 1400px;
}

.page-header {
  margin-bottom: var(--xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: var(--xs);
}

/* Period selector */
.period-select {
  background: var(--surface-light);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--sm) var(--md);
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
}

.period-select:focus {
  outline: none;
  border-color: var(--cyan);
}

/* Grid layouts */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--lg);
  margin-bottom: var(--xl);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--lg);
  margin-bottom: var(--xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--lg);
  margin-bottom: var(--xl);
}

/* Responsive */
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .sidebar {
    width: 60px;
    overflow: hidden;
  }
  .sidebar-brand { display: none; }
  .nav-item { padding: var(--sm); text-align: center; font-size: 11px; }
  .main { margin-left: 60px; padding: var(--lg); }
  .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* Login screen */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--xl);
}

.login-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: var(--xxl);
  width: 100%;
  max-width: 380px;
  text-align: center;
}

.login-box h1 {
  font-size: 24px;
  color: var(--hot-pink);
  margin-bottom: var(--xs);
}

.login-box h1 span {
  color: var(--cyan);
  font-weight: 400;
}

.login-box p {
  color: var(--text-secondary);
  margin-bottom: var(--xl);
  font-size: 12px;
}

.login-input {
  width: 100%;
  background: var(--surface-light);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--md) var(--lg);
  font-family: inherit;
  font-size: 13px;
  margin-bottom: var(--lg);
}

.login-input:focus {
  outline: none;
  border-color: var(--cyan);
}

.login-input::placeholder {
  color: var(--text-tertiary);
}

.login-btn {
  width: 100%;
  background: var(--cyan);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  padding: var(--md) var(--lg);
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s;
}

.login-btn:hover {
  opacity: 0.9;
}

.login-error {
  color: var(--pass-red);
  font-size: 12px;
  margin-top: var(--md);
  display: none;
}