/* ============================================
   Chess Academy — Layout
   Sidebar, Header, Grid, Responsive
   ============================================ */

/* ── App Shell ── */
.app {
  display: none;
  min-height: 100vh;
}

.app.active {
  display: flex;
}

/* ── Login Screen ── */
.login-screen {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  background: var(--color-bg-primary);
}

.login-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-12);
  background-color: var(--color-brand-navy);
  overflow: hidden;
}

.login-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background-color: var(--color-board-light);
  background-image:
    linear-gradient(45deg, var(--color-board-dark) 25%, transparent 25%, transparent 75%, var(--color-board-dark) 75%),
    linear-gradient(45deg, var(--color-board-dark) 25%, transparent 25%, transparent 75%, var(--color-board-dark) 75%);
  background-size: 56px 56px;
  background-position: 0 0, 28px 28px;
}

.login-hero-content {
  position: relative;
  z-index: 1;
  max-width: 420px;
}

.login-hero-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border: 1px solid rgba(244, 239, 230, 0.2);
  border-radius: var(--radius-md);
  color: var(--color-brand-gold-light);
  margin-bottom: var(--space-6);
  background: rgba(0, 0, 0, 0.2);
}

.login-hero-mark .icon {
  width: 1.5rem;
  height: 1.5rem;
}

.login-hero h1 {
  font-size: var(--text-3xl);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
  line-height: 1.15;
}

.login-hero p {
  color: var(--color-sidebar-text);
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
}

.login-hero-meta {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-sidebar-border);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  animation: fadeIn 500ms ease-out;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  box-shadow: var(--shadow-lg);
}

.login-logo {
  margin-bottom: var(--space-8);
}

.login-logo h1 {
  font-size: var(--text-2xl);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.login-logo p {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.login-form .form-group {
  margin-bottom: var(--space-4);
}

.login-form .btn {
  width: 100%;
  margin-top: var(--space-4);
}

.login-demo-accounts {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.login-demo-accounts h4 {
  font-family: var(--font-primary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.demo-account-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.demo-account-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  font-family: var(--font-primary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
}

.demo-account-btn:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-brand-gold);
  color: var(--color-text-primary);
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-sticky);
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-sidebar-border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-base), transform var(--transition-base);
  overflow: hidden;
}

.sidebar-brand {
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-sidebar-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: var(--header-height);
  flex-shrink: 0;
}

.sidebar-brand .brand-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(244, 239, 230, 0.12);
  border-radius: var(--radius-md);
  color: var(--color-brand-gold-light);
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.04);
}

.sidebar-brand .brand-icon .icon {
  width: 1.125rem;
  height: 1.125rem;
}

.sidebar-brand .brand-text {
  flex: 1;
  min-width: 0;
}

.sidebar-brand .brand-name {
  font-size: var(--text-sm);
  font-family: var(--font-display);
  font-weight: var(--font-bold);
  color: var(--color-sidebar-text-active);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.sidebar-brand .brand-sub {
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3);
  overflow-y: auto;
}

.sidebar-section {
  margin-bottom: var(--space-4);
}

.sidebar-section-title {
  font-size: 10px;
  font-weight: var(--font-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(201, 191, 176, 0.55);
  padding: var(--space-3) var(--space-3) var(--space-2);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-sidebar-text);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-primary);
  margin-bottom: 1px;
}

.sidebar-link:hover {
  color: var(--color-sidebar-text-active);
  background: var(--color-sidebar-hover);
}

.sidebar-link.active {
  color: var(--color-sidebar-text-active);
  background: var(--color-sidebar-active);
  font-weight: var(--font-semibold);
  box-shadow: inset 3px 0 0 var(--color-brand-gold);
}

.sidebar-link .link-icon {
  width: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  opacity: 0.85;
}

.sidebar-link.active .link-icon {
  color: var(--color-brand-gold-light);
  opacity: 1;
}

.sidebar-link .link-badge {
  margin-left: auto;
  font-size: 10px;
  background: var(--color-accent-red);
  color: white;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-weight: var(--font-bold);
}

.sidebar-footer {
  padding: var(--space-3);
  border-top: 1px solid var(--color-sidebar-border);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: default;
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-sidebar-text-active);
}

.sidebar-user-role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ── Main Content ── */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  transition: margin-left var(--transition-base);
}

/* ── Header ── */
.header {
  height: var(--header-height);
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 253, 248, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.header-title {
  font-size: var(--text-lg);
  font-family: var(--font-display);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.tz-clocks-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.tz-clock {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
}

.tz-clock-label {
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
  min-width: 1.75rem;
}

.tz-clock-time {
  color: var(--color-text-primary);
  font-variant-numeric: tabular-nums;
}

.tz-clock-user .form-select {
  font-size: var(--text-xs);
  padding: 2px 6px;
  min-height: auto;
  font-family: var(--font-mono);
}

.tz-schedule-note {
  margin: var(--space-3) 0;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.tz-trainer-preview {
  font-size: var(--text-sm);
  color: var(--color-accent-green);
  margin-top: var(--space-2);
  font-weight: var(--font-medium);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.header-profile {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-2);
}

.header-profile-name {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
}

.menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.menu-toggle .icon {
  width: 1.125rem;
  height: 1.125rem;
}

.menu-toggle:hover {
  background: var(--color-bg-elevated);
}

/* ── Page Content ── */
.page-content {
  padding: var(--space-6) var(--space-8);
  max-width: var(--content-max-width);
  animation: fadeIn 240ms ease-out;
}

/* ── Grid Layouts ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-4);
}

/* ── Section ── */
.section {
  margin-bottom: var(--space-6);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--text-md);
  font-family: var(--font-display);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

/* ── Assistant Panel ── */
.agent-panel {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-agent);
}

.agent-toggle {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-brand-navy);
  border: 1px solid var(--color-brand-navy-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  box-shadow: var(--shadow-md);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
  color: white;
}

.agent-toggle:hover {
  background: var(--color-brand-navy-light);
  box-shadow: var(--shadow-lg);
}

.agent-chat {
  position: absolute;
  bottom: calc(100% + var(--space-3));
  right: 0;
  width: 400px;
  max-height: 520px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.agent-chat.open {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.agent-chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-tertiary);
}

.agent-chat-header .agent-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-green);
}

.agent-chat-header h4 {
  flex: 1;
  font-size: var(--text-sm);
  font-family: var(--font-display);
  font-weight: var(--font-semibold);
  color: var(--color-brand-navy);
}

.agent-chat-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.agent-chat-actions .btn {
  height: auto;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
}

.agent-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.agent-message {
  max-width: 85%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  animation: fadeInUp 300ms ease-out;
}

.agent-message.bot {
  background: var(--color-bg-elevated);
  color: var(--color-text-secondary);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.agent-message.user {
  background: var(--color-brand-navy);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.agent-input-area {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-2);
}

.agent-input-area input {
  flex: 1;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  font-family: var(--font-primary);
}

.agent-input-area input:focus {
  outline: none;
  border-color: var(--color-accent-blue);
}

.agent-input-area button {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-brand-navy);
  border: none;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.agent-input-area button:hover {
  background: var(--color-brand-navy-light);
}

/* ── Notification Panel ── */
.notification-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  height: 100vh;
  background: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border);
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  display: flex;
  flex-direction: column;
}

.notification-panel.open {
  transform: translateX(0);
}

.notification-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.notification-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3);
}

.notification-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-bottom: var(--space-1);
}

.notification-item:hover {
  background: var(--color-bg-elevated);
}

.notification-item.unread {
  background: rgba(26, 46, 74, 0.04);
}

.notification-item .notif-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.875rem;
}

.notification-item .notif-content {
  flex: 1;
  min-width: 0;
}

.notification-item .notif-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.notification-item .notif-time {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .header-profile-name {
    display: none;
  }
}

@media (max-width: 768px) {
  .login-screen {
    grid-template-columns: 1fr;
  }

  .login-hero {
    display: none;
  }

  .login-container {
    padding: var(--space-4);
    min-height: 100vh;
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .menu-toggle {
    display: flex;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }

  .form-row, .form-row-3 {
    grid-template-columns: 1fr;
  }

  .agent-chat {
    width: calc(100vw - var(--space-8));
    right: calc(-1 * var(--space-2));
  }

  .notification-panel {
    width: 100%;
  }

  .page-content {
    padding: var(--space-4);
  }

  .header {
    padding: 0 var(--space-4);
  }

  .calendar-cell {
    min-height: 60px;
  }

  .demo-account-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .login-card {
    padding: var(--space-6);
  }
}

/* ── Overlay for mobile sidebar ── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-sticky) - 1);
}

.sidebar-overlay.active {
  display: block;
}