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

:root {
  --color-bg: #f5f0e8;
  --color-surface: #ffffff;
  --color-primary: #4a7c59;
  --color-primary-hover: #3a6347;
  --color-accent: #e8913a;
  --color-accent-hover: #d07a28;
  --color-player: #2e7d32;
  --color-bank: #c62828;
  --color-text: #2c2c2c;
  --color-text-light: #5a5a5a;
  --color-border: #d4cfc6;
  --color-chat-bg: #fafaf7;
  --color-user-bubble: #dcedc8;
  --color-tutor-bubble: #e3f2fd;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

html {
  font-size: 18px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

header {
  background: var(--color-primary);
  color: #fff;
  text-align: center;
  padding: 1rem;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 700;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

h2 {
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
  color: var(--color-primary);
}

button {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s, transform 0.1s;
}

button:active {
  transform: scale(0.97);
}

/* --- Regelkasten --- */

.rules-box {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

.rules-box p {
  margin-top: 0.3rem;
  font-size: 0.95rem;
}

/* --- Content Grid --- */

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

/* --- Chat --- */

.chat-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.chat-messages {
  flex: 1;
  min-height: 300px;
  max-height: 420px;
  overflow-y: auto;
  background: var(--color-chat-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.8rem;
  margin-bottom: 0.6rem;
}

.chat-bubble {
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  max-width: 88%;
  word-wrap: break-word;
  font-size: 0.95rem;
  line-height: 1.45;
}

.chat-bubble.user {
  background: var(--color-user-bubble);
  margin-left: auto;
  text-align: right;
}

.chat-bubble.tutor {
  background: var(--color-tutor-bubble);
  margin-right: auto;
}

.chat-bubble.thinking {
  background: var(--color-tutor-bubble);
  margin-right: auto;
  font-style: italic;
  color: var(--color-text-light);
}

.chat-input-row {
  display: flex;
  gap: 0.5rem;
}

.chat-input-row input {
  flex: 1;
  font-family: inherit;
  font-size: 1rem;
  padding: 0.6rem 0.8rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
}

.chat-input-row input:focus {
  border-color: var(--color-primary);
}

#btn-send {
  background: var(--color-primary);
  color: #fff;
}

#btn-send:hover {
  background: var(--color-primary-hover);
}

.chat-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

#btn-hint {
  background: var(--color-accent);
  color: #fff;
}

#btn-hint:hover {
  background: var(--color-accent-hover);
}

#btn-restart {
  background: #888;
  color: #fff;
}

#btn-restart:hover {
  background: #666;
}

/* --- Würfelbereich --- */

.dice-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.dice-display {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.8rem;
}

.die {
  font-size: 4rem;
  width: 5rem;
  height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border: 3px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 3px 6px rgba(0,0,0,0.1);
  user-select: none;
  transition: transform 0.2s;
}

.die.rolling {
  animation: shake 0.3s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-8deg) scale(1.05); }
  75% { transform: rotate(8deg) scale(1.05); }
}

.dice-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 0.8rem;
}

#btn-roll-once {
  background: var(--color-primary);
  color: #fff;
}

#btn-roll-once:hover {
  background: var(--color-primary-hover);
}

#btn-roll-thirty {
  background: var(--color-accent);
  color: #fff;
}

#btn-roll-thirty:hover {
  background: var(--color-accent-hover);
}

#btn-clear-table {
  background: #888;
  color: #fff;
}

#btn-clear-table:hover {
  background: #666;
}

.stats-box {
  display: flex;
  justify-content: space-around;
  background: var(--color-chat-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.5rem;
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}

.stats-box strong {
  font-size: 1.1rem;
}

#stat-player { color: var(--color-player); }
#stat-bank { color: var(--color-bank); }

.results-table-container {
  max-height: 250px;
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

#results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

#results-table th {
  background: var(--color-primary);
  color: #fff;
  padding: 0.4rem 0.5rem;
  position: sticky;
  top: 0;
  z-index: 1;
}

#results-table td {
  padding: 0.3rem 0.5rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

#results-table tr.winner-player td {
  background: #e8f5e9;
}

#results-table tr.winner-bank td {
  background: #ffebee;
}

/* --- Forschertabelle --- */

.combinations-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

#btn-show-combinations {
  background: var(--color-primary);
  color: #fff;
  margin-bottom: 0.8rem;
}

#btn-show-combinations:hover {
  background: var(--color-primary-hover);
}

.combinations-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.6rem;
}

.combination-card {
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.6rem 0.8rem;
  font-size: 0.9rem;
}

.combination-card.player-sum {
  border-color: var(--color-player);
  background: #e8f5e9;
}

.combination-card.bank-sum {
  border-color: var(--color-bank);
  background: #ffebee;
}

.combination-card .sum-header {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.combination-card .pairs {
  color: var(--color-text-light);
}

.combination-card .count {
  font-weight: 600;
  margin-top: 0.2rem;
}

.combination-impossible {
  font-style: italic;
  color: var(--color-text-light);
  padding: 0.5rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 0.6rem;
}

/* --- Abschlussbox --- */

.conclusion-box {
  background: linear-gradient(135deg, #e8f5e9, #e3f2fd);
  border: 3px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.conclusion-box h2 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.conclusion-box p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

/* --- Hidden --- */

.hidden {
  display: none !important;
}

/* --- Responsive --- */

@media (max-width: 780px) {
  html {
    font-size: 16px;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .dice-display {
    gap: 1rem;
  }

  .die {
    font-size: 3rem;
    width: 4rem;
    height: 4rem;
  }

  .combinations-container {
    grid-template-columns: 1fr;
  }
}