/* ===========================================
   Chín Ánh Sáng — Design System & Styles
   Tác giả: Quách Vĩnh Nam
   =========================================== */

/* --- Tokens --- */
:root {
  color-scheme: dark;

  /* Background */
  --bg-deep: #141210;
  --bg-surface: #1C1A16;
  --bg-elevated: #252320;

  /* Text - Increased contrast */
  --text-primary: #f7f0e9;
  --text-secondary: #B5AFA6;
  --text-tertiary: #8C847A;

  /* Borders */
  --border: #35302A;
  --border-light: #443E36;

  /* 9 Lights - Slightly brighter and more saturated for impact */
  --light-1: #E3B061;
  --light-2: #84ACCC;
  --light-3: #AA9DE3;
  --light-4: #DB8B69;
  --light-5: #7ABB9B;
  --light-6: #8D90C2;
  --light-7: #64BCB9;
  --light-8: #CC7A8A;
  --light-9: #E6DDD0;

  /* Typography */
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --max-width: 740px;
  --page-gutter: var(--space-6);

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 0.4s;
}

@media (min-width: 768px) {
  :root {
    --page-gutter: var(--space-8);
  }
}

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

/* --- Base --- */
html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-secondary);
  background-color: var(--bg-deep);
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- Typography --- */
h1,
h2,
h3 {
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(3.5rem, 10vw, 5.8rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  margin-bottom: var(--space-6);
}

h3 {
  font-size: 1.05rem;
  font-weight: 500;
}

p {
  max-width: 58ch;
}

/* --- Shared --- */
.mono {
  font-family: var(--font-mono);
}

.dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--c);
  flex-shrink: 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-4);
}

/* --- Layout --- */
.section {
  padding: var(--space-32) 0;
  border-bottom: 1px solid var(--border);
}

.section:last-of-type {
  border-bottom: none;
}

.inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--page-gutter);
}

.inner--wide {
  max-width: 920px;
}

/* ============================
   Opening
   ============================ */
.opening {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8);
  position: relative;
  border-bottom: 1px solid var(--border);
}

.opening__content {
  animation: fadeIn 1.2s var(--ease) both;
}

.opening__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: var(--space-12);
}

.opening__title {
  margin-bottom: var(--space-8);
}

.opening__tagline {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 2;
  max-width: 36ch;
  margin: 0 auto;
}

.opening__author {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  margin-top: var(--space-16);
  letter-spacing: 0.05em;
}

.opening__scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.1rem;
  color: var(--text-tertiary);
  animation: drift 3s ease-in-out infinite;
  opacity: 0.5;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes drift {

  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  50% {
    transform: translateX(-50%) translateY(6px);
  }
}

/* ============================
   Lights List
   ============================ */
.lights-list {
  list-style: none;
  margin-top: var(--space-12);
}

.light-item {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  gap: var(--space-2) var(--space-4);
  align-items: baseline;
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border);
  transition: background-color 0.3s var(--ease);
}

.light-item:last-child {
  border-bottom: 1px solid var(--border);
}

.light-item__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  padding-top: 0.15em;
}

.light-item__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.light-item__name {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
  color: var(--text-primary);
  font-size: 1rem;
}

.light-item__name .dot {
  transition: box-shadow 0.4s var(--ease);
}

.light-item:hover .light-item__name .dot {
  box-shadow: 0 0 6px 2px var(--c);
}

.light-item__role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

.light-item__desc {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-top: var(--space-2);
}

.light-item__group {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  text-align: right;
  white-space: nowrap;
  padding-top: 0.2em;
}

@media (max-width: 600px) {
  .light-item {
    grid-template-columns: 2rem 1fr;
  }

  .light-item__group {
    display: none;
  }
}

/* ============================
   Flow / Formulas
   ============================ */
.formulas {
  margin-top: var(--space-12);
}

.formula {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--border);
}

.formula:last-child {
  border-bottom: 1px solid var(--border);
}

.formula__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.formula__expr {
  font-size: clamp(1.1rem, 2.8vw, 1.5rem);
  font-weight: 400;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  max-width: none;
  line-height: 1.8;
}

.formula__term {
  color: var(--text-primary);
  font-weight: 500;
}

.formula__term[data-c] {
  color: var(--c);
}

.formula__op {
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  font-weight: 400;
  font-size: 0.85em;
}

.formula__anno {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  display: block;
  margin-top: var(--space-2);
}

.flow-narrative {
  margin-top: var(--space-12);
  font-size: 0.9rem;
  color: var(--text-tertiary);
  line-height: 1.8;
  max-width: 52ch;
}

/* ============================
   Domains
   ============================ */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8) var(--space-12);
  margin-top: var(--space-12);
}

@media (max-width: 700px) {
  .domains-grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

.domain__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.domain__name {
  margin-bottom: var(--space-4);
  font-size: 1rem;
}

.domain__lights {
  list-style: none;
  margin-bottom: var(--space-4);
}

.domain__lights li {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  padding: var(--space-1) 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.domain__attitude {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  line-height: 1.6;
  font-style: italic;
}

/* ============================
   Assessment
   ============================ */
.assessment-intro p {
  margin-bottom: var(--space-4);
  font-size: 0.95rem;
}

.assessment-prev {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  margin-top: var(--space-6);
  padding: var(--space-4);
  border: 1px solid var(--border);
  display: none;
}

.assessment-prev a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--border-light);
  padding: var(--space-3) var(--space-8);
  cursor: pointer;
  transition: border-color var(--duration) var(--ease),
    background-color var(--duration) var(--ease);
  margin-top: var(--space-8);
  letter-spacing: 0.02em;
}

.btn:hover {
  border-color: var(--text-tertiary);
  background-color: var(--bg-surface);
}

.btn--ghost {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  border-color: var(--border);
  padding: var(--space-2) var(--space-6);
}

.btn--ghost:hover {
  color: var(--text-secondary);
}

/* Question slides */
.assessment-panel {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.assessment-progress {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-16);
}

.progress-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  min-width: 3ch;
}

.progress-bar {
  flex: 1;
  height: 1px;
  background: var(--border);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--text-tertiary);
  transition: width 0.5s var(--ease);
  width: 0%;
}

.question {
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.question--exit {
  opacity: 0;
  transform: translateY(-12px);
}

.question--enter {
  opacity: 0;
  transform: translateY(12px);
}

.question__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.question__light {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
  color: var(--text-primary);
  font-size: 1.1rem;
  margin-bottom: var(--space-8);
}

.question__text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-12);
  max-width: none;
}

/* Rating circles */
.rating {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
}

.rating__option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.rating__circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  transition: border-color 0.2s var(--ease),
    background-color 0.2s var(--ease),
    color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.rating__option:hover .rating__circle {
  border-color: var(--text-tertiary);
  transform: scale(1.08);
}

.rating__option.is-selected .rating__circle {
  background-color: var(--active-color, var(--text-primary));
  border-color: var(--active-color, var(--text-primary));
  color: var(--bg-deep);
}

.rating__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s;
}

.rating__option:hover .rating__label,
.rating__option.is-selected .rating__label {
  opacity: 1;
}

@media (max-width: 480px) {
  .rating {
    gap: var(--space-4);
  }

  .rating__circle {
    width: 38px;
    height: 38px;
    font-size: 0.75rem;
  }
}

/* ============================
   Results
   ============================ */
.results-chart-wrap {
  display: flex;
  justify-content: center;
  margin: var(--space-12) 0;
}

#radar-chart {
  max-width: 380px;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
}

.results-scores {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4) var(--space-8);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
  .results-scores {
    grid-template-columns: 1fr;
  }
}

.results-domain {
  padding: var(--space-4) 0;
}

.results-domain__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: var(--space-2);
}

.results-domain__name {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
}

.results-domain__score {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-primary);
  font-weight: 500;
}

.results-domain__score span {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 400;
}

.results-insight {
  margin-top: var(--space-12);
  padding: var(--space-6);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  line-height: 1.8;
}

.results-insight__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: var(--space-3);
}

.results-actions {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.results-date {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
}

/* ============================
   Footer
   ============================ */
.footer {
  padding: var(--space-16) 0;
  text-align: center;
}

.footer__text {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

/* ============================
   Scroll Reveal
   ============================ */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  }

  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .reveal-stagger .reveal {
    transition-delay: calc(var(--i, 0) * 50ms);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .opening__content {
    animation: none;
  }

  .opening__scroll {
    animation: none;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ============================
   Utilities
   ============================ */
[hidden] {
  display: none !important;
}