:root {
  --color-bg: #f6f4ee;
  --color-surface: #ffffff;
  --color-border: #e0dccc;
  --color-text: #2f2a1f;
  --color-text-soft: #6b6353;
  --color-accent: #c5a458;
  --color-accent-soft: #ede4cf;
  --color-owner: #b66e3a;
  --color-editor: #6b8e5a;
  --color-viewer: #8a8275;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 6px 16px rgba(0, 0, 0, 0.06);
  font-family: 'Zen Maru Gothic', 'Zen Kaku Gothic New', system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

.portal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 24px 32px 16px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.brand h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 0.04em;
  color: var(--color-accent);
}

.brand .tagline {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--color-text-soft);
}

.session-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 13px;
}

.user-email {
  color: var(--color-text-soft);
}

.classroom-selector {
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  font-family: inherit;
  font-size: 13px;
}

.role-badge {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: white;
}

.role-badge.owner { background: var(--color-owner); }
.role-badge.editor { background: var(--color-editor); }
.role-badge.viewer { background: var(--color-viewer); }

.portal-main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 32px;
}

.empty-state {
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 48px 32px;
  text-align: center;
}

.empty-state h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.empty-state p {
  margin: 0 0 24px;
  color: var(--color-text-soft);
}

.btn-primary {
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px 24px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-primary:hover { background: #b59445; }

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.app-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow);
}

.app-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.06), 0 12px 24px rgba(0, 0, 0, 0.08);
}

.app-card-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.app-card h2 {
  margin: 0 0 6px;
  font-size: 18px;
}

.app-card p {
  margin: 0;
  font-size: 13px;
  color: var(--color-text-soft);
}

.modal-dialog {
  border: none;
  border-radius: var(--radius);
  padding: 0;
  background: var(--color-surface);
  box-shadow: var(--shadow);
  max-width: 480px;
  width: 92%;
}

.modal-dialog::backdrop {
  background: rgba(40, 35, 25, 0.4);
}

.modal-dialog form {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-dialog h2 {
  margin: 0 0 4px;
  font-size: 18px;
}

.modal-dialog label {
  display: flex;
  flex-direction: column;
  font-size: 13px;
  gap: 6px;
}

.modal-dialog input,
.modal-dialog select {
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin: 8px 0 0;
  padding: 0;
}

.dialog-actions button {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 8px 18px;
  border-radius: 8px;
  font-family: inherit;
  cursor: pointer;
}

.dialog-actions .btn-primary {
  border-color: var(--color-accent);
}