/* ============================================================
   style.css — Schüler-Feedback-System
   Basiert auf dem Phoenix-Designsystem (base.css + components.css)
   ============================================================ */

:root {
  --color-positive: #2563eb;
  --color-positive-soft: #dbeafe;
  --color-negative: #d97706;
  --color-negative-soft: #fef3c7;
  --color-accent: #0f766e;
  --color-accent-soft: #e6f3f1;

  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-surface-soft: #f5f5f4;
  --color-border: #e7e5e4;
  --color-border-strong: #d6d3d1;
  --color-text: #1c1917;
  --color-text-muted: #57534e;
  --color-text-soft: #78716c;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter",
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1.0625rem;
  --fs-md: 1.1875rem;
  --fs-lg: 1.5rem;
  --fs-xl: 2rem;
  --fs-2xl: 2.75rem;

  --content-max: 720px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --transition-fast: 120ms ease-out;
  --transition-base: 220ms ease-out;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
[hidden] { display: none !important; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.55;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em 0;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
h1 { font-size: var(--fs-2xl); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
h4 { font-size: var(--fs-md); }

p { margin: 0 0 1em 0; }
.muted { color: var(--color-text-muted); }
.soft { color: var(--color-text-soft); }

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Site Header ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}
.site-title {
  font-size: var(--fs-md);
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}
.site-title a {
  color: var(--color-text);
  text-decoration: none;
}
.site-title a:hover { color: var(--color-positive); }

.course-badge {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  border: 1px solid rgba(15, 118, 110, 0.2);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- Screens ---------- */
.screen { display: none; }
.screen.is-active { display: block; }

/* ---------- Setup Screen ---------- */
.setup-hero {
  padding-block: clamp(3rem, 8vw, 5rem) clamp(1.5rem, 3vw, 2.5rem);
  text-align: center;
}
.setup-hero h1 { margin-bottom: 0.75rem; }
.setup-hero__lead {
  max-width: 50ch;
  margin: 0 auto;
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.setup-form {
  max-width: 420px;
  margin: 0 auto;
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.form-group__label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text);
}
.form-group__hint {
  font-size: var(--fs-xs);
  color: var(--color-text-soft);
}

.form-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input:focus {
  outline: none;
  border-color: var(--color-positive);
  box-shadow: 0 0 0 3px var(--color-positive-soft);
}
.form-input::placeholder { color: var(--color-text-soft); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  background-color: var(--color-positive);
  color: #fff;
  font-weight: 600;
  font-size: var(--fs-base);
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.btn-primary:hover { background-color: #1d4ed8; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--fs-sm);
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}
.btn-secondary:hover { border-color: var(--color-positive); }

/* ---------- Progress Bar ---------- */
.progress-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0;
  font-size: var(--fs-xs);
  color: var(--color-text-soft);
}
.progress-bar__track {
  flex: 1;
  height: 4px;
  background-color: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  background-color: var(--color-positive);
  border-radius: 2px;
  transition: width 400ms ease-out;
}

/* ---------- Chat Screen ---------- */
.chat-container {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 120px);
}

.chat-messages {
  flex: 1;
  padding: 1rem 0 2rem;
  overflow-y: auto;
}

.msg {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1rem;
  animation: msg-in 300ms ease-out;
}
@keyframes msg-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg--bot { flex-direction: row; }
.msg--user { flex-direction: row-reverse; }

.msg__avatar {
  flex-shrink: 0;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-sm);
  font-weight: 700;
  line-height: 1;
}
.msg--bot .msg__avatar {
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
}
.msg--user .msg__avatar {
  background-color: var(--color-positive-soft);
  color: var(--color-positive);
}

.msg__bubble {
  max-width: 80%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  line-height: 1.5;
  font-size: var(--fs-sm);
  white-space: pre-wrap;
  word-break: break-word;
}
.msg--bot .msg__bubble {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top-left-radius: 2px;
}
.msg--user .msg__bubble {
  background-color: var(--color-positive);
  color: #fff;
  border-top-right-radius: 2px;
}

/* Typing indicator */
.typing-indicator {
  display: inline-flex;
  gap: 4px;
  padding: 0.25rem 0;
}
.typing-indicator span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-text-soft);
  animation: typing-bounce 1.2s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ---------- Options (show_options tool) ---------- */
.options-panel {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.options-panel__question {
  font-weight: 600;
  font-size: var(--fs-sm);
  margin-bottom: 0.25rem;
}
.options-panel__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.option-btn {
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1.5px solid var(--color-border-strong);
  background-color: var(--color-surface);
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast),
              color var(--transition-fast), transform var(--transition-fast);
}
.option-btn:hover {
  border-color: var(--color-positive);
  color: var(--color-positive);
  transform: translateY(-1px);
}
.option-btn--selected {
  background-color: var(--color-positive);
  border-color: var(--color-positive);
  color: #fff;
}
.option-btn--selected:hover {
  background-color: #1d4ed8;
  color: #fff;
}

.options-confirm {
  margin-top: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.options-confirm__count {
  font-size: var(--fs-xs);
  color: var(--color-text-soft);
}

/* ---------- Chat Input ---------- */
.chat-input-area {
  position: sticky;
  bottom: 0;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 0.75rem 0;
}

.chat-input {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

.chat-input__field {
  flex: 1;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--fs-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  resize: none;
  min-height: 2.6rem;
  max-height: 6rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.chat-input__field:focus {
  outline: none;
  border-color: var(--color-positive);
  box-shadow: 0 0 0 3px var(--color-positive-soft);
}
.chat-input__field::placeholder { color: var(--color-text-soft); }

.chat-input__send {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  border: none;
  background-color: var(--color-positive);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.chat-input__send:hover { background-color: #1d4ed8; transform: translateY(-1px); }
.chat-input__send:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.chat-input__send svg { width: 1.1rem; height: 1.1rem; }

/* ---------- Summary Screen ---------- */
.summary-section {
  padding-block: clamp(2rem, 5vw, 3rem);
}
.summary-section h2 { margin-bottom: 0.5rem; }
.summary-section__lead {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.summary-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.summary-card__label {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}
.summary-card__text {
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  white-space: pre-wrap;
}

.summary-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ---------- Thanks Screen ---------- */
.thanks-section {
  padding-block: clamp(4rem, 10vw, 8rem);
  text-align: center;
}
.thanks-section h1 {
  margin-bottom: 0.5rem;
  color: var(--color-positive);
}
.thanks-section__icon {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  background-color: var(--color-positive-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.thanks-section__icon svg {
  width: 2rem;
  height: 2rem;
  color: var(--color-positive);
}
.thanks-section__lead {
  max-width: 50ch;
  margin: 0 auto 2rem;
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ---------- Loading Spinner ---------- */
.spinner {
  width: 1.2rem;
  height: 1.2rem;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-positive);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
  vertical-align: middle;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- Error Message ---------- */
.error-msg {
  padding: 0.75rem 1rem;
  background-color: var(--color-negative-soft);
  border: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  color: var(--color-negative);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  :root {
    --content-max: 100%;
  }
  .msg__bubble { max-width: 88%; }
  .setup-hero { padding-block: 2rem 1rem; }
}