@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

:root {
  --blue: #2980B9;
  --green: #27AE60;
  --orange: #E67E22;
  --red: #E74C3C;
  --dark: #2C3E50;
  --mid: #7F8C8D;
  --light: #ECF0F1;
  --white: #FFFFFF;
  --pastel-blue: #D6EAF8;
  --pastel-green: #D5F5E3;
  --pastel-yellow: #FEF9E7;
  --pastel-purple: #E8DAEF;
  --pastel-orange: #FDEBD0;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.1);
}

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

body {
  font-family: 'Poppins', sans-serif;
  background: #F4F6F8;
  color: var(--dark);
  min-height: 100vh;
}

/* ── Layout ── */
#app { max-width: 600px; margin: 0 auto; padding: 0 0 80px; }

.screen { display: none; }
.screen.active { display: block; }

/* ── Header ── */
.app-header {
  background: var(--white);
  box-shadow: var(--shadow);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-header h1 { font-size: 1.1rem; font-weight: 700; color: var(--dark); flex: 1; }
.header-badge {
  background: var(--pastel-blue);
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
}
#btn-logout {
  background: none;
  border: none;
  color: var(--mid);
  cursor: pointer;
  font-size: 1.3rem;
}

/* ── Cards ── */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 16px 16px 0;
}
.card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--dark);
}

/* ── Buttons ── */
.btn {
  display: block;
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  text-align: center;
  text-decoration: none;
}
.btn:active { transform: scale(0.98); opacity: 0.85; }
.btn-primary { background: var(--blue); color: var(--white); }
.btn-green { background: var(--green); color: var(--white); }
.btn-orange { background: var(--orange); color: var(--white); }
.btn-ghost { background: var(--light); color: var(--dark); }
.btn-small {
  display: inline-block;
  width: auto;
  padding: 8px 18px;
  font-size: 0.85rem;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Forms ── */
.form-group { margin-bottom: 14px; }
label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 5px; color: var(--mid); }
input, select, textarea {
  width: 100%;
  padding: 13px 14px;
  border: 2px solid var(--light);
  border-radius: 10px;
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
  color: var(--dark);
  background: var(--white);
  transition: border-color 0.2s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--blue);
}

/* ── Login screen ── */
#screen-login {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  background: linear-gradient(135deg, var(--pastel-blue) 0%, var(--pastel-purple) 100%);
}
.login-box {
  background: var(--white);
  border-radius: 20px;
  padding: 32px 24px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}
.login-logo { font-size: 2.5rem; text-align: center; margin-bottom: 8px; }
.login-title { text-align: center; font-size: 1.3rem; font-weight: 700; margin-bottom: 4px; }
.login-sub { text-align: center; color: var(--mid); font-size: 0.85rem; margin-bottom: 24px; }

/* ── Kind-Auswahl ── */
.kind-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin: 16px; }
.kind-btn {
  background: var(--white);
  border: 3px solid var(--light);
  border-radius: var(--radius);
  padding: 20px 8px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  font-family: 'Poppins', sans-serif;
}
.kind-btn:hover, .kind-btn.selected { border-color: var(--blue); background: var(--pastel-blue); }
.kind-avatar { font-size: 2rem; margin-bottom: 6px; }
.kind-name { font-weight: 700; font-size: 0.95rem; }
.kind-class { color: var(--mid); font-size: 0.75rem; }

/* ── Arbeit-Liste ── */
.arbeit-list { list-style: none; }
.arbeit-item {
  background: var(--white);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform 0.1s;
}
.arbeit-item:active { transform: scale(0.98); }
.arbeit-fach-badge {
  background: var(--pastel-blue);
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  white-space: nowrap;
}
.arbeit-info { flex: 1; }
.arbeit-thema { font-weight: 600; font-size: 0.95rem; }
.arbeit-meta { color: var(--mid); font-size: 0.78rem; margin-top: 2px; }
.status-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
}
.status-neu { background: var(--pastel-yellow); color: var(--orange); }
.status-quellen_extrahiert { background: var(--pastel-blue); color: var(--blue); }
.status-materialien_fertig { background: var(--pastel-green); color: var(--green); }
.status-bewertet { background: var(--pastel-purple); color: #8E44AD; }

/* ── Upload zone ── */
.upload-zone {
  border: 3px dashed var(--light);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  margin-bottom: 12px;
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--blue);
  background: var(--pastel-blue);
}
.upload-icon { font-size: 2.5rem; margin-bottom: 8px; }
.upload-text { font-weight: 600; color: var(--dark); }
.upload-sub { color: var(--mid); font-size: 0.82rem; margin-top: 4px; }
.preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
.preview-img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid var(--light);
}

/* ── Materialien ── */
.material-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}
.material-icon { font-size: 2rem; }
.material-info { flex: 1; }
.material-name { font-weight: 700; }
.material-sub { color: var(--mid); font-size: 0.8rem; }
.material-actions { display: flex; gap: 8px; }

/* ── Spinner / Loading ── */
.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.85);
  z-index: 500;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}
.loading-overlay.active { display: flex; }
.spinner {
  width: 48px; height: 48px;
  border: 5px solid var(--light);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-weight: 600; color: var(--dark); font-size: 1rem; }

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--dark);
  color: var(--white);
  padding: 12px 24px;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0;
  transition: all 0.3s;
  pointer-events: none;
  z-index: 600;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.error { background: var(--red); }
.toast.success { background: var(--green); }

/* ── Step indicator ── */
.steps {
  display: flex;
  padding: 16px 16px 0;
  gap: 4px;
}
.step {
  flex: 1;
  height: 4px;
  background: var(--light);
  border-radius: 2px;
}
.step.done { background: var(--green); }
.step.active { background: var(--blue); }

/* ── Score display ── */
.score-box {
  text-align: center;
  padding: 24px;
  border-radius: var(--radius);
  margin-bottom: 14px;
}
.score-big { font-size: 3rem; font-weight: 700; line-height: 1; }
.score-label { color: var(--mid); font-size: 0.9rem; margin-top: 4px; }

/* ── Bottom nav (mobile) ── */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0; right: 0;
  background: var(--white);
  box-shadow: 0 -2px 12px rgba(0,0,0,0.08);
  padding: 8px 0;
  z-index: 200;
}
.bottom-nav.active { display: flex; justify-content: space-around; }
.nav-btn {
  background: none;
  border: none;
  padding: 6px 16px;
  cursor: pointer;
  font-family: 'Poppins', sans-serif;
  font-size: 0.7rem;
  color: var(--mid);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.nav-btn.active { color: var(--blue); }
.nav-icon { font-size: 1.4rem; }

/* ── Responsive ── */
@media (max-width: 400px) {
  .kind-grid { grid-template-columns: 1fr 1fr; }
}