/* --- GENERAL STYLES --- */
:root {
  --primary-color: #3498db;
  --danger-color: #e74c3c;
  --success-color: #2ecc71;
  --light-bg: #f4f7f9;
  --dark-text: #2c3e50;
  --light-text: #7f8c8d;
  --white: #ffffff;
  --border-color: #bdc3c7;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 20px;
  background-color: var(--light-bg);
  color: var(--dark-text);
}

h1 {
  color: var(--dark-text);
  text-align: center;
}

#instructions {
  background-color: var(--white);
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
  max-width: 800px;
  width: 90%;
  text-align: left;
  border-left: 5px solid var(--primary-color);
}

#instructions ul {
  padding-left: 20px;
}

#controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
  width: 100%;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 25px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  color: white;
  transition: opacity 0.3s;
}

#startButton {
  background-color: var(--primary-color);
}
#resetButton {
  background-color: var(--danger-color);
}
#showResultButton {
  background-color: var(--success-color);
  display: none;
}

.btn:hover {
  opacity: 0.9;
}
.btn:disabled {
  background-color: var(--border-color);
  cursor: not-allowed;
}

#timer-container {
  font-size: 24px;
  font-weight: bold;
  color: var(--dark-text);
  background-color: var(--white);
  padding: 10px 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  min-width: 200px;
  text-align: center;
}

#timer-label {
  font-size: 14px;
  font-weight: normal;
  color: var(--light-text);
}

#kraepelin-grid {
  display: none;
  flex-direction: row;
  overflow-x: auto;
  padding: 20px;
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  max-width: 90vw;
  width: 100%;
}

.column {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 10px;
  padding: 10px;
  border: 2px solid transparent;
  border-radius: 8px;
  transition: border-color 0.3s, background-color 0.3s;
}

.column.active {
  border-color: var(--primary-color);
  background-color: #ecf0f1;
}

.column.finished {
  background-color: #f8f9f9;
}

.problem-row {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}

.numbers-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 40px;
}

.number {
  font-size: 24px;
  font-weight: bold;
  line-height: 1;
}

.plus-sign {
  font-size: 20px;
  color: var(--light-text);
  line-height: 1;
}

.answer-input {
  width: 45px;
  height: 45px;
  text-align: center;
  font-size: 24px;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  margin-left: 15px;
  /* -moz-appearance: textfield; */
  transition: border-color 0.2s, background-color 0.2s;
}

.answer-input::-webkit-outer-spin-button,
.answer-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* --- STYLES FEEDBACK JAWABAN --- */
.answer-input.correct {
  border: 2px solid var(--success-color);
  background-color: #f0fff0;
}
.answer-input.incorrect {
  border: 2px solid var(--danger-color);
  background-color: #fff0f0;
}
.answer-input.empty {
  background-color: #f7f7f7;
  border: 1px dashed #cccccc;
}
.answer-input:disabled {
  cursor: default;
  color: var(--dark-text);
}

/* --- STYLES HASIL --- */
#results-container {
  margin-top: 30px;
  padding: 20px;
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  max-width: 800px;
  width: 90%;
  text-align: center;
  display: none;
  border-top: 5px solid var(--success-color);
}

#results-container h2 {
  color: var(--dark-text);
  margin-top: 0;
}

#results-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

#results-table th,
#results-table td {
  border: 1px solid var(--border-color);
  padding: 10px;
  text-align: center;
}

#results-table th {
  background-color: #ecf0f1;
  font-weight: bold;
}

.summary-box {
  display: flex;
  justify-content: space-around;
  margin-top: 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.summary-item {
  padding: 10px 20px;
  border-radius: 5px;
  background-color: #e8f6f3;
  border: 1px solid var(--success-color);
  min-width: 120px;
}

.summary-item strong {
  display: block;
  font-size: 32px;
  color: var(--dark-text);
}

/* --- STYLES RESPONSIVE --- */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 24px;
  }

  #controls {
    flex-direction: column;
    gap: 15px;
  }

  #timer-container {
    width: 90%;
  }

  #kraepelin-grid {
    overflow-x: hidden;
    padding: 10px;
    max-width: 100%;
  }

  .column {
    display: none;
    margin: 0;
    width: 100%;
  }

  .column.active {
    display: flex;
  }

  .numbers-container {
    width: 50px;
  }
  .answer-input {
    width: 50px;
    height: 50px;
  }
}