/* Configpair — Design System Stylesheet */
/* All brand tokens declared as CSS custom properties */

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

:root {
  /* --- Brand tokens (from assets/brand.md) --- */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Mono', monospace;
  --font-mono: 'IBM Plex Mono', monospace;
  --radius: 2px;
  --space-unit: 4px;
  --stance: dense;

  /* --- Palette (light mode) --- */
  --color-primary: #2C4238;
  --color-primary-hover: #3A5A4C;
  --color-accent: #C9703E;
  --color-danger: #B84747;
  --color-success: #3E7B52;
  --color-secret-bg: #FFF3D6;
  --color-bg: #F6F6F4;
  --color-bg-secondary: #EDEDEA;
  --color-bg-code: #E8E8E5;
  --color-text-primary: #1C1C1A;
  --color-text-secondary: #5C5C57;
  --color-text-muted: #8C8C87;
  --color-border: #D4D4D0;
  --color-bg-card: #FFFFFF;

  /* --- Spacing derived from space-unit --- */
  --space-1: calc(var(--space-unit) * 1);   /* 4px */
  --space-2: calc(var(--space-unit) * 2);   /* 8px */
  --space-3: calc(var(--space-unit) * 3);   /* 12px */
  --space-4: calc(var(--space-unit) * 4);   /* 16px */
  --space-6: calc(var(--space-unit) * 6);   /* 24px */
  --space-8: calc(var(--space-unit) * 8);   /* 32px */
  --space-12: calc(var(--space-unit) * 12);  /* 48px */
  --space-16: calc(var(--space-unit) * 16);  /* 64px */

  /* --- Motion --- */
  --motion-fast: 150ms;
  --motion-medium: 200ms;
  --ease-default: ease;
}

/* === DARK MODE === */
[data-theme="dark"] {
  --color-bg: #1A1A18;
  --color-bg-secondary: #252523;
  --color-bg-code: #2A2A28;
  --color-bg-card: #222220;
  --color-text-primary: #E8E8E4;
  --color-text-secondary: #A8A8A3;
  --color-text-muted: #787873;
  --color-border: #3A3A38;
  --color-primary: #4A7A62;
  --color-primary-hover: #5A8E74;
  --color-secret-bg: #3A3020;
  --color-bg-code: #2A2A28;
}

body {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--color-text-primary);
}

h1 { font-size: 2rem; font-weight: 600; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; font-weight: 500; }
h3 { font-size: 1rem; font-weight: 500; }
p { line-height: 1.6; }

code, pre, kbd, .mono {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

/* === CONTAINER === */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* === SECTION EYEBROW === */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

/* === NAV === */
.nav {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  gap: var(--space-4);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text-primary);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.nav__brand:hover {
  opacity: 0.85;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
}
.nav__link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-1) 0;
  transition: color var(--motion-fast) var(--ease-default);
}
.nav__link:hover {
  color: var(--color-text-primary);
}
.nav__link--active {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
}
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

/* === THEME TOGGLE === */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 0;
  cursor: pointer;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: var(--space-1) var(--space-2);
  transition: color var(--motion-fast) var(--ease-default),
              border-color var(--motion-fast) var(--ease-default);
  line-height: 1;
}
.theme-toggle:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-muted);
}

/* === FOOTER === */
.footer {
  margin-top: var(--space-16);
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.footer__links {
  display: flex;
  gap: var(--space-4);
}
.footer__link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--motion-fast) var(--ease-default);
}
.footer__link:hover {
  color: var(--color-text-primary);
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  transition: background var(--motion-fast) var(--ease-default),
              border-color var(--motion-fast) var(--ease-default);
  line-height: 1;
}
.btn:hover {
  background: var(--color-bg-code);
  border-color: var(--color-text-muted);
}
.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}
.btn--accent:hover {
  opacity: 0.9;
}
.btn--small {
  padding: var(--space-1) var(--space-2);
  font-size: 0.7rem;
}
.btn--active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* === HOME PAGE === */

/* Hero */
.hero {
  padding: var(--space-12) 0 var(--space-8);
}
.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.hero__headline {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  max-width: 650px;
}
.hero__sub {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 580px;
  margin-bottom: var(--space-6);
}

.hero__image {
  width: 100%;
  height: auto;
  display: block;
  border: 0;
  border-radius: 0;
}

@media (max-width: 768px) {
  .hero__content {
    grid-template-columns: 1fr;
  }
  .hero__image {
    margin-top: var(--space-4);
  }
}

/* Diagram */
.diagram {
  margin: var(--space-8) 0;
  width: 100%;
}
.diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Section */
.section {
  padding: var(--space-12) 0;
}
.section--alt {
  background: var(--color-bg-secondary);
}
.section__inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}
.section__header {
  margin-bottom: var(--space-6);
}
.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}
.section__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

/* Two-column feature */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-4);
}
.feature-split__card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
}
.feature-split__card h3 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}
.feature-split__card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* Three-column stat/proof strip */
.proof-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}
.proof-strip__item {
  border-right: 1px solid var(--color-border);
  padding-right: var(--space-4);
}
.proof-strip__item:last-child {
  border-right: none;
}
.proof-strip__number {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: var(--space-1);
}
.proof-strip__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Plain text content blocks */
.content-block {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 650px;
}
.content-block p {
  margin-bottom: var(--space-3);
}
.content-block ul {
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-3);
}
.content-block li {
  padding: var(--space-1) 0 var(--space-1) var(--space-4);
  position: relative;
}
.content-block li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

/* Limit cards */
.limit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-4);
}
.limit-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-danger);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
}
.limit-card__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
  color: var(--color-danger);
}
.limit-card__text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Example output card */
.example-output {
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre;
  color: var(--color-text-primary);
  margin-top: var(--space-4);
}

/* CTA section */
.cta-section {
  padding: var(--space-12) 0;
  text-align: center;
}
.cta-section h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-3);
}
.cta-section p {
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto var(--space-6);
}
.cta-section .btn {
  font-size: 0.9rem;
  padding: var(--space-3) var(--space-6);
}

/* === APP / TOOL PAGE === */

/* Paste area */
.paste-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.paste-area__column {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.paste-area__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* File input row */
.paste-area__file-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}
.file-input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}
.file-trigger {
  cursor: pointer;
}
.paste-area__file-name {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
}
.env-input {
  width: 100%;
  min-height: 240px;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--color-text-primary);
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  resize: vertical;
  transition: border-color var(--motion-fast) var(--ease-default);
}
.env-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Toolbar */
.toolbar {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
  align-items: center;
}

/* Results */
.results {
  margin-bottom: var(--space-6);
  opacity: 0;
  transition: opacity var(--motion-medium) var(--ease-default);
  min-height: 80px;
}
.results--visible {
  opacity: 1;
}
.results__empty {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: center;
  padding: var(--space-8) 0;
}

/* Stats bar */
.stats-bar {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.stats-bar__item {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
}
.stats-bar__item strong {
  margin-left: var(--space-1);
}
.stats-bar__item--missing {
  border-color: var(--color-danger);
  color: var(--color-danger);
}
.stats-bar__item--changed {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.stats-bar__item--same {
  border-color: var(--color-success);
  color: var(--color-success);
}

/* Section cards */
.section-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
  padding: 0;
  opacity: 0;
  animation: cardFadeIn var(--motion-medium) var(--ease-default) forwards;
}
.section-card:nth-child(2) { animation-delay: 50ms; }
.section-card:nth-child(3) { animation-delay: 100ms; }
.section-card:nth-child(4) { animation-delay: 150ms; }

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .section-card {
    animation: none;
    opacity: 1;
  }
}

.section-card__header {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.section-card__label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.section-card__count {
  font-weight: 400;
  color: var(--color-text-muted);
  margin-left: var(--space-1);
}
.section-card__body {
  padding: var(--space-2) var(--space-3);
}
.section-card__sub {
  margin-bottom: var(--space-3);
}
.section-card__sub:last-child {
  margin-bottom: 0;
}
.section-card__subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.section-card__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.section-card__row {
  display: flex;
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-1) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.8rem;
  transition: background var(--motion-fast) var(--ease-default);
}
.section-card__row:last-child {
  border-bottom: none;
}
.section-card__row--secret {
  background: var(--color-secret-bg);
  margin: 0 calc(-1 * var(--space-3));
  padding: var(--space-1) var(--space-3);
}
.section-card__key {
  color: var(--color-text-primary);
  font-weight: 500;
  min-width: 140px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.section-card__value {
  color: var(--color-text-secondary);
}
.section-card__changed {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  flex-wrap: wrap;
}
.section-card__arrow {
  color: var(--color-accent);
  font-weight: 500;
}
.section-card__val-left {
  color: var(--color-danger);
}
.section-card__val-right {
  color: var(--color-primary);
}

/* Export bar */
.export-bar {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  opacity: 0;
  transition: opacity var(--motion-medium) var(--ease-default);
}
.export-bar--visible {
  opacity: 1;
}

/* === PRICING PAGE === */

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
}
.pricing-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-6);
}
.pricing-card--featured {
  border-color: var(--color-primary);
  border-width: 2px;
  position: relative;
}
.pricing-card--featured::before {
  content: 'Recommended';
  position: absolute;
  top: -1px;
  right: var(--space-4);
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-1) var(--space-3);
}
.pricing-card__name {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.pricing-card__price {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}
.pricing-card__price-sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.pricing-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-bottom: var(--space-4);
}
.pricing-card__features {
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-6);
}
.pricing-card__features li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: var(--space-1) 0;
  color: var(--color-text-secondary);
}
.pricing-card__features li::before {
  content: '✓ ';
  color: var(--color-success);
}
.pricing-card__features li.pricing-card__feature--disabled {
  color: var(--color-text-muted);
}
.pricing-card__features li.pricing-card__feature--disabled::before {
  content: '— ';
  color: var(--color-text-muted);
}

/* === LEGAL PAGES (privacy, terms) === */

.legal-page {
  padding: var(--space-8) 0;
}
.legal-page h1 {
  font-size: 1.75rem;
  margin-bottom: var(--space-1);
}
.legal-page .last-updated {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}
.legal-page h2 {
  font-size: 1.1rem;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}
.legal-page h3 {
  font-size: 0.95rem;
  margin-top: var(--space-4);
  margin-bottom: var(--space-1);
}
.legal-page p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}
.legal-page ul {
  list-style: disc;
  padding-left: var(--space-4);
  margin-bottom: var(--space-3);
}
.legal-page li {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}
.legal-page strong {
  color: var(--color-text-primary);
}
.legal-page .notice-box {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: var(--space-4) 0;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  h1 { font-size: 1.5rem; }
  .hero__headline { font-size: 1.75rem; }
  
  .nav__links { gap: var(--space-3); }
  .nav__link { font-size: 0.75rem; }
  
  .paste-area { grid-template-columns: 1fr; }
  .feature-split { grid-template-columns: 1fr; }
  .proof-strip { grid-template-columns: 1fr; gap: var(--space-3); }
  .proof-strip__item { border-right: none; border-bottom: 1px solid var(--color-border); padding-bottom: var(--space-3); }
  .proof-strip__item:last-child { border-bottom: none; }
  .limit-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  
  .section-card__row { flex-wrap: wrap; }
  .section-card__key { min-width: 100px; }
  
  .stats-bar { flex-wrap: wrap; }
  .toolbar { flex-wrap: wrap; }
  .export-bar { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .nav__inner { flex-wrap: wrap; }
  .nav__brand { font-size: 1rem; }
  .nav__links { order: 3; width: 100%; justify-content: space-between; padding-top: var(--space-2); border-top: 1px solid var(--color-border); }
  .nav__actions { margin-left: 0; }
  
  .section-card__row { font-size: 0.75rem; }
  .stats-bar__item { font-size: 0.7rem; }
}