/* ==========================================================================
   IT Maturity Diagnostic — shared styles for the intro page and the
   question-by-question survey. No CSS framework: a small set of custom
   properties plus flexbox is enough for this "one clean question at a
   time" layout.
   ========================================================================== */

:root {
  --color-bg: #f7f8fb;
  --color-card-bg: #ffffff;
  --color-text: #1a2b4c;
  --color-text-muted: #6b7280;
  --color-primary: #2c4a7c;
  --color-primary-hover: #1f3760;
  --color-border: #e2e5ec;
  --color-error: #c0392b;
  --color-success: #2f8f4e;
  --shadow-card: 0 10px 30px rgba(26, 43, 76, 0.08);
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.3rem;
  margin: 0 0 0.75rem;
}

/* ---------- Intro page ---------- */

.intro-body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.intro-card {
  width: 100%;
  max-width: 520px;
  background: var(--color-card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 2.5rem;
}

.intro-description {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.5;
  margin-bottom: 1.75rem;
}

#intro-form label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

#intro-form input[type="text"],
#intro-form input[type="email"] {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: 0.3rem;
  font-family: inherit;
}

#intro-form input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.field-error {
  color: var(--color-error);
  font-size: 0.85rem;
  min-height: 1.1em;
  margin: 0 0 0.9rem;
}

.notice {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin: 0.5rem 0 1.5rem;
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  text-align: center;
  transition: background-color 150ms ease, transform 150ms ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

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

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: #ececf2;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---------- Survey (SPA) page ---------- */

#progress-bar-track {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-border);
  z-index: 10;
}

#progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--color-primary);
  transition: width 250ms ease;
}

.survey-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding: 3rem 1rem;
}

.survey-main {
  width: 100%;
  max-width: 640px;
}

.loading-message {
  text-align: center;
  color: var(--color-text-muted);
}

.question-index {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.question-card {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 250ms ease, transform 250ms ease;
}

.question-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.question-text {
  font-size: 1.5rem;
  line-height: 1.35;
  margin: 0 0 0.75rem;
}

.question-description {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.5;
  margin-bottom: 2rem;
}

.scale-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 2rem;
}

.scale-option {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  width: 100%;
  padding: 0.9rem 1.1rem;
  background: var(--color-card-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: var(--color-text);
  transition: border-color 150ms ease, background-color 150ms ease;
}

.scale-option:hover {
  border-color: var(--color-primary);
}

.scale-option.selected {
  border-color: var(--color-primary);
  background: #eef2f9;
}

.scale-option .scale-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.8rem;
  height: 1.8rem;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  font-weight: 700;
  font-size: 0.9rem;
}

.scale-option.selected .scale-number {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.survey-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.warning-banner {
  background: #fdecea;
  color: var(--color-error);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.finish-screen {
  text-align: center;
}

.finish-screen h1 {
  color: var(--color-success);
}

/* ---------- Small screens ---------- */

@media (max-width: 480px) {
  .intro-card {
    padding: 1.75rem;
  }

  .question-text {
    font-size: 1.25rem;
  }

  .survey-nav {
    flex-direction: column-reverse;
    align-items: stretch;
  }
}