/* ========== BASE STYLES ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Open Sans', sans-serif;
  background: var(--color-page-bg);
  color: var(--color-text);
}

html, body {
  width: 100%;
  height: 100%;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: calc(100dvh - var(--header-height, 96px));
}

#app.classroom-view {
  height: calc(100dvh - var(--header-height, 96px));
  overflow: hidden;
}

/* ========== HEADER ========== */
.header {
  background: var(--color-header-bg);
  box-shadow: 0 2px 10px var(--color-header-shadow);
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 200;
}

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header-logo img {
  height: 79px;
  width: auto;
  object-fit: contain;
  display: block;
}

.header-buttons {
  display: flex;
  gap: 6px;
  align-items: center;
}

/* Header icon toolbar, borderless icons; purple fill only when selected/open */
.header-buttons .btn-header-menu,
.header-buttons .btn-notification,
.header-buttons .btn-reports,
.header-buttons .btn-help,
.header-student-view-wrap .student-view-toggle {
  width: 40px;
  height: 40px;
  min-width: 40px;
  min-height: 40px;
  padding: 0;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--color-toolbar-btn-icon);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-sizing: border-box;
  transition: background 0.15s ease, color 0.15s ease;
}

.header-buttons .btn-header-menu i,
.header-buttons .btn-notification i,
.header-buttons .btn-reports i,
.header-buttons .btn-help i,
.header-student-view-wrap .student-view-toggle i {
  font-size: 1.25rem;
  line-height: 1;
  color: inherit;
}

.header-buttons .btn-header-menu:hover:not([aria-expanded="true"]),
.header-buttons .btn-notification:hover:not([aria-expanded="true"]),
.header-buttons .btn-reports:hover,
.header-buttons .btn-help:hover,
.header-student-view-wrap .student-view-toggle:hover:not(.active) {
  background: var(--color-toolbar-btn-hover-bg);
  color: var(--color-toolbar-btn-icon);
}

.header-student-view-wrap .student-view-toggle.active,
.header-buttons .btn-header-menu[aria-expanded="true"],
.header-buttons .btn-notification[aria-expanded="true"] {
  background: var(--color-toolbar-btn-active-bg);
  color: var(--color-toolbar-btn-active-icon);
}

/* Header student list / card view toggle (teacher classroom only) */
.header-student-view-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-student-view-wrap .student-showcase-btn:hover:not(.active) {
  background: var(--color-toolbar-btn-hover-bg);
  color: var(--color-toolbar-btn-icon);
}

.header-student-view-wrap .student-view-toggle-group {
  display: flex;
  gap: 4px;
  border: none;
  border-radius: 0;
  overflow: visible;
}

.header-reports-wrap {
  position: relative;
  display: flex;
  align-items: center;
  padding-left: 10px;
  margin-left: 4px;
  border-left: 1px solid var(--color-toolbar-divider);
}

.header-help-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.btn-help {
  position: relative;
  gap: 0;
  font-size: 1.25rem;
  line-height: 1;
}

.btn-help i {
  font-size: 1.25rem;
  line-height: 1;
}

/* Header cog menu */
.header-menu-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.btn-header-menu {
  position: relative;
  gap: 0;
  font-size: 1.25rem;
  line-height: 1;
}

.btn-header-menu i {
  font-size: 1.25rem;
  line-height: 1;
}

/* Theme toggle (legacy, menu dropdown is primary) */
.btn-theme {
  background: transparent;
  color: var(--color-toolbar-btn-icon);
  border: none;
  padding: 0;
  min-width: 40px;
  min-height: 40px;
  justify-content: center;
  font-size: 1.25rem;
  line-height: 1;
  border-radius: 10px;
}

.btn-theme:hover {
  background: var(--color-toolbar-btn-hover-bg);
  color: var(--color-toolbar-btn-icon);
}

.header-menu-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 240px;
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 12px;
  box-shadow: var(--shadow-lg), 0 0 0 1px var(--color-border);
  z-index: 1003;
  overflow: hidden;
  padding: 6px 0;
}

.header-menu-dropdown.hidden {
  display: none;
}

.header-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 16px;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  font-family: 'Open Sans', sans-serif;
  color: var(--color-text);
}

.header-menu-item:hover,
.header-menu-item:focus-visible {
  background: var(--color-brand-hover-bg);
  outline: none;
}

.header-menu-item[hidden] {
  display: none;
}

.header-menu-item i {
  width: 18px;
  text-align: center;
  color: var(--color-primary);
}

.header-menu-item--danger {
  color: var(--color-danger-dark);
}

.header-menu-item--danger i {
  color: var(--color-danger-dark);
}

.header-menu-item--danger:hover,
.header-menu-item--danger:focus-visible {
  background: rgba(239, 68, 68, 0.12);
}

.header-menu-divider {
  height: 1px;
  margin: 6px 0;
  background: var(--color-border);
}

.header-menu-divider[hidden] {
  display: none;
}

/* Theme picker inside cog menu */
.header-menu-theme-section {
  padding: 8px 12px 10px;
}

.header-menu-theme-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px 8px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-light);
}

.header-menu-theme-heading i {
  color: var(--color-primary);
  font-size: 12px;
}

.header-menu-theme-options {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.header-menu-theme-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 12px;
  border: 2px solid transparent;
  border-radius: 8px;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  font-family: 'Open Sans', sans-serif;
  color: var(--color-text);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.header-menu-theme-option i {
  width: 16px;
  text-align: center;
  color: var(--color-primary);
}

.header-menu-theme-option:hover,
.header-menu-theme-option:focus-visible {
  background: var(--color-brand-hover-bg);
  outline: none;
}

.header-menu-theme-option.active {
  background: var(--color-brand-hover-bg);
  border-color: var(--color-primary);
  color: var(--color-text);
}

.header-menu-theme-option.active i {
  color: var(--color-primary);
}

/* ========== BUTTONS ========== */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: 'Open Sans', sans-serif;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-login {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-login:hover {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-register {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-register:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-logout {
  background: var(--color-danger);
  color: var(--color-on-primary);
}

.btn-logout:hover {
  background: var(--color-danger-dark);
}

.btn-change-classroom {
  background: var(--color-warning);
  color: var(--color-on-primary);
}

.btn-change-classroom:hover {
  background: var(--color-warning-dark);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: 15px 40px;
  font-size: 16px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(124, 115, 255, 0.3);
}

.btn-primary:disabled {
  background: var(--color-border);
  color: var(--color-text-secondary);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: 13px 38px;
  font-size: 16px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-on-primary);
  transform: translateY(-3px);
}

.btn-delete {
  background: var(--color-danger);
  color: var(--color-on-primary);
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-delete:hover {
  background: var(--color-danger-dark);
}

.btn-delete-sm {
  background: transparent;
  border: none;
  color: var(--color-danger);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 12px;
  transition: all 0.2s ease;
}

.btn-delete-sm:hover {
  background: rgba(239, 68, 68, 0.15);
  border-radius: 4px;
}

/* ========== FORMS ========== */
.form-container {
  min-height: calc(100dvh - var(--header-height, 96px));
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-page-bg);
  padding: 20px;
}

.form-box {
  background: var(--color-surface);
  border-radius: 16px;
  padding: 40px;
  max-width: 700px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.5s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.form-header {
  text-align: center;
  margin-bottom: 30px;
}

.form-title {
  font-family: 'Audiowide', sans-serif;
  font-size: 28px;
  margin-bottom: 5px;
  color: var(--color-text);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--color-input-border);
  border-radius: 8px;
  font-family: 'Open Sans', sans-serif;
  font-size: 14px;
  transition: border-color 0.3s ease;
  color: var(--color-input-text);
  background-color: var(--color-input-bg);
}

.form-container .form-group input,
.form-container .form-group select,
.form-container .form-group textarea {
  color: var(--color-input-text);
  background-color: var(--color-input-bg);
}

.form-container .form-group input::placeholder,
.form-container .form-group textarea::placeholder {
  color: var(--color-text-light);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 115, 255, 0.1);
}

.form-submit {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.form-submit:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.form-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.form-footer a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

.back-btn {
  position: relative;
  background: rgba(124, 115, 255, 0.05);
  color: var(--color-primary);
  border: none;
  padding: 10px 16px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  overflow: hidden;
}

.back-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(124, 115, 255, 0.1);
  border-radius: 50px;
  transition: left 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: -1;
}

.back-btn:hover::before {
  left: 0;
}

.back-btn:hover {
  background: rgba(124, 115, 255, 0.15);
  transform: translateX(-3px);
  box-shadow: -5px 10px 20px rgba(124, 115, 255, 0.15);
}

.back-btn:hover i {
  animation: slideArrow 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.back-btn:active {
  transform: translateX(-1px);
}

@keyframes slideArrow {
  0% { transform: translateX(0); }
  50% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

.form-actions {
  display: flex;
  gap: 15px;
  margin-top: 30px;
}

.form-actions button {
  flex: 1;
}

/* ========== TOAST ========== */
#toast-container {
  position: fixed;
  top: calc(var(--header-height, 96px) + 12px);
  right: 20px;
  z-index: 21000;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  max-width: min(360px, calc(100vw - 24px));
  pointer-events: none;
}

#toast-container .toast {
  pointer-events: auto;
}

.toast {
  padding: 16px 20px;
  border-radius: 8px;
  color: var(--color-on-primary);
  background: #334155;
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease;
  min-width: 300px;
}

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

.toast-error {
  background: var(--color-danger);
}

.toast-info {
  background: var(--color-info);
}

.toast-warning {
  background: var(--color-warning);
  color: var(--color-text);
}

@keyframes slideInRight {
  from {
    transform: translateX(50px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ========== MODAL CONTAINER ========== */
#modal-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 13050;
  padding: max(12px, env(safe-area-inset-top, 0px)) max(12px, env(safe-area-inset-right, 0px)) max(12px, env(safe-area-inset-bottom, 0px)) max(12px, env(safe-area-inset-left, 0px));
  pointer-events: none;
  display: none;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-sizing: border-box;
}

#modal-container:not(:empty) {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--modal-backdrop);
  backdrop-filter: blur(6px);
  pointer-events: auto;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  /* Keep logo + toolbar in one horizontal band on all logged-in views */
  .header {
    flex-direction: row !important;
    flex-wrap: wrap;
    align-items: center;
    padding: 10px 12px;
    gap: 8px;
  }

  .header-logo img {
    height: 50px;
  }

  .header-buttons {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: wrap;
    width: auto !important;
    flex: 1 1 auto;
    justify-content: flex-end;
    align-items: center;
    gap: 6px;
  }

  .header-help-wrap,
  .header-menu-wrap,
  .header-reports-wrap,
  .notification-center-wrap,
  .mail-center-wrap {
    flex-direction: row;
    width: auto;
  }

  /* Auth text buttons may grow; icon toolbar stays compact */
  .header-buttons .btn-login,
  .header-buttons .btn-register {
    width: auto;
    justify-content: center;
  }

  .header-buttons .btn,
  .header-buttons .btn-header-menu,
  .header-buttons .btn-notification,
  .header-buttons .btn-reports,
  .header-buttons .btn-help,
  .header-buttons .student-view-toggle {
    width: 40px !important;
    min-width: 40px;
    max-width: 40px;
  }

  .header-buttons .btn-login,
  .header-buttons .btn-register {
    width: auto !important;
    min-width: 0;
    max-width: none;
  }

  .form-box {
    padding: 20px;
  }

  #modal-container:not(:empty) {
    align-items: flex-start;
  }

  /* Mobile classroom is cards-only — hide showcase / list / card view toggles */
  #header-student-view-wrap,
  #header-student-view-wrap.header-student-view-wrap--mobile-hidden {
    display: none !important;
  }
}