/* CSS Custom Properties */
:root {
  --primary: #9F7AEA;
  --primary-dark: #6C63FF;
  --accent: #FF6584;
  --accent-light: #3E3968;
  --background: #23213A;
  --glass-bg: rgba(62, 57, 104, 0.65);
  --text: #F7FAFC;
  --text-muted: #A0AEC0;
  --border: #3E3968;
  --radius: 16px;
  --shadow: 0 4px 32px rgba(159,122,234,0.16);
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
  --font-main: 'Inter', system-ui, sans-serif;
  --font-heading: 'Montserrat', 'Inter', system-ui, sans-serif;
  --container-max-width: 900px;
  --container-padding: 40px;
  --gap-main: 2.5rem;
  --gap-small: 1.2rem;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--background);
  color: var(--text);
  font-family: var(--font-main);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  font-size: 1rem;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

/* Container */
.container {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  width: 100vw;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding: var(--container-padding);
  gap: var(--gap-main);
  place-items: center;
}

/* Header and SparkQuiz Heading */
header {
  text-align: center;
  width: 100%;
}

.spark-heading {
  position: relative;
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 7vw, 3.5rem);
  font-weight: 900;
  text-align: center;
  letter-spacing: 0.06em;
  margin-bottom: 1.2rem;
  line-height: 1.1;
  background: linear-gradient(90deg, #ff6584 10%, #9f7aea 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  z-index: 1;
  user-select: none;
}

.spark-gradient {
  background: linear-gradient(90deg, var(--primary) 30%, var(--accent) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  padding-bottom: 0.15em;
  position: relative;
}

.spark-underline {
  display: block;
  position: absolute;
  left: 50%;
  bottom: 0.2em;
  transform: translateX(-50%);
  width: 50%;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, #ff6584 0%, #9f7aea 100%);
  opacity: 0.75;
  animation: spark-underline-anim 4s infinite alternate;
  z-index: -1;
}

@keyframes spark-underline-anim {
  0% { width: 20%; opacity: 0.75; }
  100% { width: 40%; opacity: 1; }
}

/* Info and About Box */
.info-box,
.about-box {
  background: var(--glass-bg);
  color: var(--primary);
  border-radius: var(--radius);
  padding: 1.5rem 2.5rem;
  margin-bottom: 2rem;
  text-align: center;
  font-size: 1.1rem;
  max-width: 80ch;
  width: 100%;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
  border: 1.5px solid rgba(159,122,234,0.13);
}

.about-box {
  color: var(--text);
  background: rgba(44, 41, 66, 0.93);
  border-radius: 20px;
  padding: 2.2rem 2.7rem;
  margin: 2.5rem auto 2rem auto;
  font-size: 1.13rem;
  max-width: 650px;
  box-shadow: 0 6px 32px rgba(159,122,234,0.13);
  border: 1.5px solid #4a436a;
  backdrop-filter: blur(6px);
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background var(--transition), border var(--transition);
}

.about-title {
  font-size: 1.4em;
  color: var(--primary);
  font-family: var(--font-heading);
  margin-bottom: 0.5em;
  letter-spacing: 0.03em;
}

.about-box a {
  display: inline-block;
  margin-top: 0.7em;
  color: var(--primary);
  font-weight: 700;
  text-decoration: underline;
  font-size: 1.01em;
  border-bottom: 2px solid #9f7aea44;
  transition: color var(--transition), border-color var(--transition);
}

.about-box a:hover {
  color: var(--accent);
  border-color: #ff6584;
}

/* Main Form Fields */
.main-fields {
  width: 100%;
  max-width: 90%;
  margin-bottom: 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-main);
  background: var(--glass-bg);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
  border: 1.5px solid rgba(159,122,234,0.13);
}

.row {
  display: flex;
  gap: 32px;
  margin-bottom: 20px;
  width: 100%;
}

.input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

label {
  color: var(--text);
  font-weight: 500;
  font-size: 1.09rem;
  margin-bottom: 8px;
}

.field-desc {
  color: var(--accent);
  font-size: 0.98em;
  font-weight: 400;
  margin-left: 4px;
}

input,
select {
  font-family: var(--font-main);
  font-size: 1rem;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 13px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: #29274C;
  color: var(--text);
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  margin-bottom: 2px;
  min-width: 0;
  box-sizing: border-box;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 7px color-mix(in srgb, var(--primary) 60%, transparent 40%);
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

input[type="radio"] {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
}

.question-types-container {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.question-types-row {
  display: flex;
  gap: 20px;
  max-width: 600px;
}

.question-type-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.type-quantity {
  margin: 0.5em 0 1em 1.7em;
  display: block;
}

.quantity-label {
  font-size: 0.98em;
  color: var(--accent);
  margin-bottom: 2px;
  font-weight: 500;
}

/* Custom Question Types */
.custom-question-types {
  margin-top: 20px;
}

.custom-question-types input {
  width: 100%;
  padding: 13px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: #29274C;
  color: var(--text);
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.custom-question-types input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 7px color-mix(in srgb, var(--primary) 60%, transparent 40%);
}

/* Custom Number Input */
input[type="number"].quantity-input-custom {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: textfield;
  background: #29274C;
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-size: 1rem;
  width: 100%;
  max-width: 120px;
  transition: border-color var(--transition), box-shadow var(--transition);
  min-width: 0;
  box-sizing: border-box;
}

input[type="number"].quantity-input-custom:focus {
  border-color: var(--primary);
  box-shadow: 0 0 7px color-mix(in srgb, var(--primary) 60%, transparent 40%);
}

input[type="number"].quantity-input-custom::-webkit-inner-spin-button,
input[type="number"].quantity-input-custom::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"].quantity-input-custom::-ms-input-spinner {
  display: none;
}

input[type="number"].quantity-input-custom[type="number"] {
  -moz-appearance: textfield;
}

/* Advanced Options */
.advanced-options {
  margin-top: 20px;
  background: rgba(41,39,76,0.96);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 32px 24px 32px;
  max-width: 1100px;
  width: 100%;
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
  margin-left: auto;
  margin-right: auto;
}

.advanced-options summary {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: #bda5ff;
  letter-spacing: 0.03em;
  cursor: pointer;
  padding-bottom: 10px;
  outline: none;
  user-select: none;
  transition: color var(--transition);
}

.advanced-options[open] summary {
  color: var(--primary);
}

.advanced-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 40px;
  width: 100%;
  max-width: 1050px;
}

.advanced-content .row {
  display: contents;
}

.radio-group {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 7px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  color: var(--text);
}

/* Centered Button */
.btn-center {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-top: 1.2rem;
}

.main-btn {
  display: block;
  margin: 0 auto;
  background: linear-gradient(90deg, #ff6584 0%, #9f7aea 100%);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 900;
  border: none;
  border-radius: 14px;
  padding: 18px 44px;
  font-size: 1.25rem;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: 0 2px 24px 0 rgba(255,101,132,0.20), var(--shadow);
  letter-spacing: 0.04em;
  text-shadow: 0 2px 12px rgba(62,57,104,0.22);
}

.main-btn:hover,
.main-btn:focus-visible {
  background: linear-gradient(90deg, #9f7aea 0%, #ff6584 100%);
  box-shadow: 0 6px 32px 0 rgba(159,122,234,0.22), 0 2px 24px 0 rgba(255,101,132,0.22);
  transform: translateY(-2px) scale(1.03);
  outline: none;
}

/* Quiz Output */
#quiz-output {
  font-family: var(--font-main);
  background: #29274C;
  color: var(--text);
  border-radius: var(--radius);
  font-size: 1.1rem;
  border: 1.5px solid var(--border);
  padding: 20px;
  margin-top: 24px;
  width: 100%;
  min-height: 320px;
  overflow-y: auto;
  line-height: 1.6;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

#quiz-output h1 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--primary);
}

#quiz-output h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--text);
}

#quiz-output p {
  margin-bottom: 10px;
}

#quiz-output ul {
  list-style-type: disc;
  margin-left: 20px;
  margin-bottom: 10px;
}

#quiz-output li {
  margin-bottom: 5px;
}

/* Loading Animation */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--primary);
  font-size: 1.2rem;
  margin-top: 20px;
}

.spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--primary);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Error Message */
.error {
  color: var(--accent);
  font-weight: 500;
  text-align: center;
  margin-top: 20px;
  background: rgba(255,101,132,0.1);
  padding: 15px;
  border-radius: var(--radius);
  border: 1.5px solid rgba(255,101,132,0.3);
}

/* Footer */
footer {
  text-align: center;
  color: var(--text-muted);
  margin: 40px 0 20px;
  font-size: 0.97rem;
  max-width: 90%;
  width: 100%;
  letter-spacing: 0.01em;
}

/* Responsive Design */
@media (max-width: 1100px) {
  .advanced-options, .advanced-content {
    max-width: 98vw;
    padding-left: 10px;
    padding-right: 10px;
  }
  .advanced-content {
    gap: 24px 16px;
  }
}

@media (max-width: 900px) {
  .container {
    padding: 20px;
    max-width: 100vw;
  }
  .main-fields, .advanced-options, #quiz-output, footer {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .spark-heading {
    font-size: 2.1rem;
  }
  .row,
  .question-types-row {
    flex-direction: column;
    gap: 15px;
    max-width: 100%;
  }
  .main-fields,
  .advanced-options,
  #quiz-output,
  footer {
    max-width: 100%;
  }
  .info-box,
  .about-box {
    padding: 1rem;
  }
  .advanced-content {
    grid-template-columns: 1fr;
    gap: 18px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 8px;
    gap: 1rem;
  }
  .main-btn {
    padding: 13px 24px;
    font-size: 1.07rem;
  }
}