/* ==========================================================================
   MBTI+ — Personality Quiz
   Palette   : "Twilight Violet" — deep indigo/violet gradient stage,
               warm coral (#FF6F5E) as the single accent for CTAs & reveals.
   Typography: Sora (display / Latin numerals / logo / result letters)
               + Noto Sans KR (Korean body & UI copy)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700;800&family=Noto+Sans+KR:wght@400;500;600;700;900&display=swap');

/* ---------------------------------------------------------------------------
   Design tokens
--------------------------------------------------------------------------- */
:root {
  /* color — core */
  --color-bg-deep: #1a1033;
  --color-bg-deep-2: #2c1854;
  --color-surface: #ffffff;
  --color-surface-tint: #faf8ff;
  --color-ink: #221a3a;
  --color-ink-soft: #5a5170;
  --color-ink-faint: #948da8;
  --color-border: #ece7f8;

  /* color — brand */
  --color-primary: #7c5cfc;
  --color-primary-600: #6a3ff0;
  --color-primary-700: #5527d6;
  --color-primary-tint: #f1ecff;
  --color-accent: #ff6f5e;
  --color-accent-600: #ff5546;
  --color-accent-tint: #ffece9;

  /* gradients */
  --gradient-stage: radial-gradient(circle at 15% 0%, #3a2166 0%, transparent 55%),
                     radial-gradient(circle at 85% 100%, #33184f 0%, transparent 55%),
                     linear-gradient(160deg, var(--color-bg-deep) 0%, var(--color-bg-deep-2) 100%);
  --gradient-primary: linear-gradient(135deg, #8f6bff 0%, #6a3ff0 100%);
  --gradient-accent: linear-gradient(135deg, #ff8a6e 0%, #ff5546 100%);
  --gradient-text: linear-gradient(135deg, #8f6bff 0%, #ff6f5e 100%);

  /* type */
  --font-display: 'Sora', 'Noto Sans KR', sans-serif;
  --font-body: 'Noto Sans KR', 'Sora', sans-serif;

  /* radius scale */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  /* shadow scale */
  --shadow-sm: 0 2px 8px rgba(34, 26, 58, 0.06);
  --shadow-md: 0 8px 24px rgba(34, 26, 58, 0.10);
  --shadow-lg: 0 20px 48px rgba(34, 26, 58, 0.16);
  --shadow-primary: 0 12px 28px rgba(106, 63, 240, 0.35);
  --shadow-accent: 0 12px 28px rgba(255, 85, 70, 0.32);

  /* motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-base: 280ms;
  --dur-slow: 520ms;
}

/* ---------------------------------------------------------------------------
   Reset & base
--------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--gradient-stage);
  background-attachment: fixed;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 32px 16px;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* ---------------------------------------------------------------------------
   App shell
--------------------------------------------------------------------------- */
.app-container {
  width: 100%;
  max-width: 680px;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.app-header {
  padding: 28px 32px 0;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.logo span {
  color: var(--color-accent);
  -webkit-text-fill-color: var(--color-accent);
}

main {
  padding: 24px 32px 40px;
}

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

.screen.active {
  display: block;
  animation: screen-in var(--dur-slow) var(--ease-out) both;
}

@keyframes screen-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .screen.active {
    animation: none;
  }
}

/* ---------------------------------------------------------------------------
   Buttons
--------------------------------------------------------------------------- */
.btn {
  border: none;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 1rem;
  padding: 16px 28px;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              filter var(--dur-fast) var(--ease-out);
}

.btn-primary {
  width: 100%;
  color: #ffffff;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-primary);
  letter-spacing: 0.01em;
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
  box-shadow: 0 16px 34px rgba(106, 63, 240, 0.42);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: 0 8px 18px rgba(106, 63, 240, 0.3);
}

.btn-text {
  background: transparent;
  color: var(--color-ink-soft);
  padding: 10px 6px;
  border-radius: var(--radius-sm);
}

.btn-text:hover {
  color: var(--color-primary-700);
}

.btn-text:active {
  transform: scale(0.97);
}

/* ---------------------------------------------------------------------------
   Screen: Intro
--------------------------------------------------------------------------- */
#screen-intro {
  padding-top: 12px;
}

.intro-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 24px 0 4px;
}

.intro-content h2 {
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  font-weight: 900;
  line-height: 1.35;
  color: var(--color-ink);
}

.intro-content > p {
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  margin-bottom: 8px;
}

.intro-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 4px 0 20px;
}

.intro-features li {
  background: var(--color-primary-tint);
  color: var(--color-primary-700);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

#screen-intro .btn-primary {
  max-width: 360px;
  font-size: 1.05rem;
  padding: 18px 28px;
}

/* ---------------------------------------------------------------------------
   Screen: Quiz
--------------------------------------------------------------------------- */
.quiz-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}

.progress-bar-track {
  flex: 1;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--gradient-primary);
  border-radius: var(--radius-pill);
  transition: width var(--dur-slow) var(--ease-out);
}

.progress-text {
  flex-shrink: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-ink-faint);
  min-width: 3.5em;
  text-align: right;
}

.quiz-body {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 28px;
  padding: 12px 0 32px;
}

.question-text {
  font-size: clamp(1.15rem, 4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.5;
  text-align: center;
  color: var(--color-ink);
  padding: 0 4px;
}

.options-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-btn {
  width: 100%;
  text-align: left;
  background: var(--color-surface-tint);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
  line-height: 1.5;
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}

.option-btn:hover {
  border-color: #c9b8ff;
  background: var(--color-primary-tint);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.option-btn:active {
  transform: translateY(0) scale(0.99);
}

.option-btn.selected {
  border-color: transparent;
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: var(--shadow-primary);
  font-weight: 700;
}

#btn-prev {
  margin-top: 8px;
}

@media (min-width: 640px) {
  .options-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .option-btn {
    display: flex;
    align-items: center;
    min-height: 96px;
  }
}

/* ---------------------------------------------------------------------------
   Screen: Result
--------------------------------------------------------------------------- */
.result-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding-top: 8px;
}

.result-eyebrow {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-600);
  margin-bottom: 4px;
}

.result-type {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 18vw, 5.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 4px 0 8px;
  animation: type-reveal 640ms var(--ease-out) both;
}

@keyframes type-reveal {
  from {
    opacity: 0;
    transform: scale(0.82) translateY(10px);
    filter: blur(6px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
    filter: blur(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .result-type {
    animation: none;
  }
}

.result-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.result-description {
  font-size: 1rem;
  color: var(--color-ink-soft);
  max-width: 46ch;
  margin-bottom: 8px;
}

/* Trait bars */
.trait-bars {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 24px 0 32px;
  padding: 24px 20px;
  background: var(--color-surface-tint);
  border-radius: var(--radius-lg);
}

.trait-row {
  display: grid;
  grid-template-columns: 4.5em 1fr 4.5em;
  align-items: center;
  gap: 12px;
}

.trait-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink-soft);
}

.trait-row:first-child .trait-label:first-child,
.trait-label {
  text-align: left;
}

.trait-row .trait-label:last-child {
  text-align: right;
}

.trait-bar-track {
  height: 10px;
  background: var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.trait-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--gradient-accent);
  border-radius: var(--radius-pill);
  transition: width 900ms var(--ease-out);
}

/* Result grid */
.result-grid {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 32px;
  text-align: left;
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
}

.result-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary-700);
  margin-bottom: 10px;
}

.result-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-card li {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}

.result-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

#screen-result .btn-primary {
  max-width: 360px;
}

@media (min-width: 640px) {
  .result-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .trait-row {
    grid-template-columns: 6em 1fr 6em;
  }
}

/* ---------------------------------------------------------------------------
   Larger viewports — breathing room
--------------------------------------------------------------------------- */
@media (min-width: 768px) {
  body {
    padding: 56px 24px;
  }

  .app-header {
    padding: 36px 48px 0;
  }

  main {
    padding: 32px 48px 56px;
  }

  .quiz-body {
    min-height: 300px;
  }
}

@media (min-width: 1024px) {
  .app-container {
    max-width: 720px;
  }
}