/* =============================================================================
   AtharvaAI — CSS STYLE SHEET
   ============================================================================= */

/* ── 1. CSS CUSTOM PROPERTIES ─────────────────────────────────────────────── */
:root {
  /* Surface hierarchy */
  --color-background:              #fbf9f5;
  --color-surface:                 #fbf9f5;
  --color-surface-container-low:   #f5f3ef;
  --color-surface-container:       #efeeea;
  --color-surface-container-high:  #eae8e4;
  --color-surface-container-highest: #e4e2de;
  --color-surface-container-lowest:  #ffffff;

  /* Brand */
  --color-primary:           #6c5a35;
  --color-primary-container: #86724c;
  --color-primary-fixed:     #f9dfb1;
  --color-primary-fixed-dim: #dcc497;

  /* Secondary */
  --color-secondary:           #5c614d;
  --color-secondary-container: #e0e5cc;
  --color-secondary-fixed:     #e0e5cc;

  /* Text */
  --color-on-surface:         #1b1c1a;
  --color-on-surface-variant: #4c463c;
  --color-on-primary:         #ffffff;
  --color-on-secondary-container: #626753;
  --color-on-secondary-fixed-variant: #444937;

  /* Utility */
  --color-outline:         #7e766a;
  --color-outline-variant: #cfc5b7;

  /* Typography */
  --font-serif:  'Newsreader', Georgia, serif;
  --font-sans:   'Inter', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs:   0.5rem;
  --space-sm:   1rem;
  --space-md:   1.5rem;
  --space-lg:   2rem;
  --space-xl:   3rem;
  --space-2xl:  4rem;
  --space-3xl:  6rem;

  /* Radius */
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-ambient: 0px 12px 32px rgba(27, 28, 26, 0.06);
  --shadow-card:    0px 4px 16px rgba(27, 28, 26, 0.05);
}

/* ── 2. RESET & BASE ──────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-background);
  color: var(--color-on-surface);
  line-height: 1.6;
  font-size: 1rem;
}

img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
textarea, input { font-family: inherit; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ── 3. LAYOUT UTILITIES ──────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 4rem);
}

.container--narrow {
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 4rem);
}

/* ── 4. TYPOGRAPHY HELPERS ────────────────────────────────────────────────── */
.serif  { font-family: var(--font-serif); }
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.6875rem;       /* label-sm */
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
}

/* ── 5. BUTTONS ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: opacity 0.2s ease, transform 0.15s ease;
}

.btn:hover  { opacity: 0.88; }
.btn:active { transform: scale(0.97); }

.btn--primary {
  /* "Signature Gradient": leather-like radial gradient */
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-container) 100%);
  color: var(--color-on-primary);
  box-shadow: var(--shadow-ambient);
}

.btn--sm  { padding: 0.45rem 1.2rem;  font-size: 0.8125rem; }
.btn--lg  { padding: 1rem 2.25rem;    font-size: 0.9375rem; }

/* ── 6. NAVIGATION ────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 249, 245, 0.80);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
}

.nav__logo {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-primary);
  opacity: 0.85;
}

/* ── 7. HERO ──────────────────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  max-width: 750px;  /* override container for narrower hero text */
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-on-surface);
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: 1rem;
  color: var(--color-on-surface-variant);
  line-height: 1.75;
  opacity: 0.85;
}

/* ── 8. INPUT SECTION ─────────────────────────────────────────────────────── */
.input-section {
  max-width: 780px;
  padding-bottom: var(--space-3xl);
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.field-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
}

.field-textarea {
  width: 100%;
  background: var(--color-surface-container-highest);
  border: none;
  border-radius: var(--radius-md);
  padding: 1.75rem 2rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--color-on-surface);
  line-height: 1.75;
  resize: vertical;
  outline: none;
  transition: box-shadow 0.2s ease;
}

/* Focus: subtle 2px glow of primary at 20% opacity */
.field-textarea:focus {
  box-shadow: 0 0 0 2px rgba(108, 90, 53, 0.2);
}

.field-textarea--readonly {
  opacity: 0.75;
  cursor: default;
}

.field-textarea::placeholder {
  color: var(--color-outline);
  font-style: italic;
  opacity: 0.6;
}

/* Arrow divider between textareas */
.input-divider {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.25rem 0;
}

.input-divider__icon {
  font-size: 1.4rem;
  color: var(--color-primary);
  opacity: 0.7;
}

/* CTA button row */
.input-cta {
  display: flex;
  justify-content: center;
  padding-top: var(--space-lg);
}

.input-cta .btn .material-symbols-outlined {
  font-size: 1.1rem;
  font-variation-settings: 'FILL' 0, 'wght' 400;
}

/* ── 9. SECTION RULE ──────────────────────────────────────────────────────── */
.section-rule {
  width: 100%;
  height: 1px;
  margin-block: var(--space-2xl);
  /* Gradient fade: "no-line" rule satisfied — this is a decorative fade, not a border */
  background: linear-gradient(
    to right,
    transparent 0%,
    var(--color-outline-variant) 25%,
    var(--color-outline-variant) 75%,
    transparent 100%
  );
  opacity: 0.25;
}

/* ── 10. RESULTS PANEL ────────────────────────────────────────────────────── */
.results-panel {
  display: none;
  animation: fadeSlideIn 0.5s ease forwards;
}

.results-panel.is-visible {
  display: block;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 11. SCORE SECTION ────────────────────────────────────────────────────── */
.score-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
}

/* SVG ring */
.score-ring-wrap {
  position: relative;
  width: 160px;
  height: 160px;
  flex-shrink: 0;
}

.score-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  overflow: visible;
}

.score-ring__track {
  fill: none;
  stroke: var(--color-surface-container-highest);
  stroke-width: 6;
}

.score-ring__fill {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 6;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.score-ring__label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.score-ring__number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
}

/* Text block alongside ring */
.score-meta {
  text-align: center;
  max-width: 600px;
}

.score-meta__eyebrow {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  margin-bottom: 0.5rem;
}

.score-meta__title {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 400;
  color: var(--color-on-surface);
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.score-meta__explanation {
  font-size: 1rem;
  color: var(--color-on-surface-variant);
  line-height: 1.75;
  opacity: 0.9;
  margin-bottom: var(--space-md);
}

/* ── 12. TAGS / CHIPS ─────────────────────────────────────────────────────── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.chip {
  display: inline-block;
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: background 0.2s ease, color 0.2s ease;
}

/* "Pressed leaf" chips for analysis results */
.chip--analysis {
  background: rgba(224, 229, 204, 0.55);   /* secondary-container at 55% */
  color: var(--color-on-secondary-container);
}

/* Filter chips in suggestions header */
.chip--filter {
  background: var(--color-surface-container-high);
  color: var(--color-on-surface);
  cursor: pointer;
  border: none;
}

.chip--filter:hover,
.chip--filter.is-active {
  background: var(--color-primary-container);
  color: var(--color-on-primary);
}

/* ── 13. COMPARISON CARDS ─────────────────────────────────────────────────── */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-3xl);
}

@media (max-width: 640px) {
  .comparison-grid { grid-template-columns: 1fr; }
}

.comparison-card {
  background: rgba(239, 238, 234, 0.5);  /* surface-container at 50% */
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.comparison-card__icon-wrap {
  width: 52px;
  height: 52px;
  background: var(--color-surface-container-highest);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.comparison-card__icon {
  font-size: 1.4rem;
  color: var(--color-primary);
  font-variation-settings: 'FILL' 0, 'wght' 300;
}

.comparison-card__heading {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-on-surface);
}

.comparison-card__body {
  font-size: 0.9rem;
  color: var(--color-on-surface-variant);
  line-height: 1.75;
  min-height: 3rem;   /* placeholder height hint */
}

/* ── 14. ANALYTICAL SYNTHESIS ─────────────────────────────────────────────── */
.synthesis-section {
  margin-bottom: var(--space-3xl);
}

.synthesis-section__title {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 400;
  color: var(--color-on-surface);
  margin-bottom: var(--space-xl);
}

.synthesis-section__body {
  font-size: 1.1rem;
  color: var(--color-on-surface);
  line-height: 1.9;
  min-height: 4rem;
}

/* Drop-cap treatment for editorial feel */
.editorial-drop-cap > p:first-of-type::first-letter {
  font-family: var(--font-serif);
  font-size: 4.5rem;
  font-weight: 600;
  float: left;
  line-height: 0.8;
  margin-right: 0.15em;
  margin-top: 0.1em;
  color: var(--color-on-surface);
}

/* ── 15. DETAILED SYNTHESIS ───────────────────────────────────────────────── */
.detailed-section {
  background: var(--color-surface-container-low);
  /* No border — background shift IS the boundary */
  border-radius: var(--radius-lg);
  padding-block: clamp(2rem, 5vw, 4rem);
  margin-bottom: var(--space-3xl);
}

.detailed-section__title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.detailed-section__subtitle {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  margin-bottom: var(--space-xl);
}

.detailed-section__body {
  font-size: 1rem;
  color: var(--color-on-surface);
  line-height: 1.9;
  column-gap: var(--space-2xl);
  min-height: 4rem;
}

@media (min-width: 768px) {
  .detailed-section__body { columns: 2; }
}

.detailed-section__body p + p {
  margin-top: var(--space-md);
}

/* ── 16. PRACTICAL APPLICATIONS ──────────────────────────────────────────── */
.applications-section {
  margin-bottom: var(--space-3xl);
}

.applications-section__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.applications-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
 max-width: 100%;
  margin-inline: auto;
  min-height: 4rem;
}

@media (max-width: 640px) {
  .applications-grid { grid-template-columns: 1fr; }
}

/* Application card (injected by JS) */
.app-card {
  background: rgba(224, 229, 204, 0.3);
  border-left: 3px solid rgba(92, 97, 77, 0.4);
  border-radius: var(--radius-md);
  padding: 2rem 2.25rem;
}

.app-card__title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: var(--space-md);
}

.app-card__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app-card__item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  font-size: 0.9rem;
  color: var(--color-on-secondary-fixed-variant);
  line-height: 1.65;
}

/* ICON FILE: 'check_circle' Material Symbol used for list items.
   Replace with a custom SVG check icon at /assets/icons/check.svg if needed. */
.app-card__item-icon {
  font-size: 1rem;
  color: var(--color-secondary);
  flex-shrink: 0;
  margin-top: 0.1rem;
  font-variation-settings: 'FILL' 0, 'wght' 400;
}

/* ── 17. SEARCH SUGGESTIONS ───────────────────────────────────────────────── */
.suggestions-section {
  padding-bottom: var(--space-3xl);
}

.suggestions-section__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.suggestions-section__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.suggestions-section__subtitle {
  font-size: 0.9rem;
  color: var(--color-on-surface-variant);
  opacity: 0.8;
}

.suggestions-section__filters {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Suggestion cards grid */
.suggestion-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 900px)  { .suggestion-cards { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px)  { .suggestion-cards { grid-template-columns: 1fr; } }

.suggestion-card {
  background: var(--color-surface-container-lowest);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, transform 0.2s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.suggestion-card:hover {
  box-shadow: var(--shadow-ambient);
  transform: translateY(-4px);
}

.suggestion-card.is-hidden {
  display: none;
}

.suggestion-card__image-wrap {
  width: 100%;
  height: 176px;
  overflow: hidden;
  background: var(--color-surface-container-highest);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Fallback pattern when image src is empty */
.suggestion-card__image-wrap--fallback {
  background: linear-gradient(
    135deg,
    var(--color-surface-container-high) 25%,
    var(--color-surface-container-highest) 100%
  );
  display: flex;
  align-items: center;
  justify-content: center;
}

.suggestion-card__image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 2.5rem;
  transition: transform 0.5s ease;
}

.suggestion-card:hover .suggestion-card__image {
  transform: scale(1.05);
}

.suggestion-card__body {
  padding: 1.75rem 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.suggestion-card__title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-on-surface);
  margin-bottom: 0.4rem;
}

.suggestion-card__desc {
  font-size: 0.8rem;
  color: var(--color-on-surface-variant);
  opacity: 0.8;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1.25rem;
}

.suggestion-card__arrow {
  font-size: 1.2rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  display: block;
}

.suggestion-card:hover .suggestion-card__arrow {
  transform: translateX(4px);
}

/* ── 18. FOOTER ───────────────────────────────────────────────────────────── */
.footer {
  padding-block: var(--space-3xl);
  margin-top: var(--space-2xl);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-lg);
  flex-wrap: wrap;
  padding-top: var(--space-xl);
  /* Ghost border fallback at 15% opacity — compliant with design system */
  border-top: 1px solid rgba(207, 197, 183, 0.15);
}

.footer__logo {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--color-primary);
  opacity: 0.8;
  display: block;
  margin-bottom: 0.5rem;
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--color-on-surface-variant);
  opacity: 0.65;
  max-width: 320px;
}

.footer__github {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-on-surface-variant);
  transition: color 0.2s;
}

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

.footer__github-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ── 19. LOADING STATE ────────────────────────────────────────────────────── */
.btn--loading {
  pointer-events: none;
  opacity: 0.65;
}

.btn--loading::after {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-left: 0.5rem;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── 20. MATERIAL SYMBOLS DEFAULT STYLING ─────────────────────────────────── */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  display: inline-flex;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  user-select: none;
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
}

/* ── 21. RESPONSIVE TWEAKS ────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .score-section { gap: var(--space-xl); }
  .suggestions-section__header { flex-direction: column; align-items: flex-start; }
}