/* ═══ Design tokens (animations.dev-inspired) ═══ */
:root {
  --ink: #0d1117;
  --ink-secondary: #3d4450;
  --ink-tertiary: #6b7280;
  --accent: #f90093;
  --accent-soft: rgba(249, 0, 147, 0.08);
  --accent-border: rgba(249, 0, 147, 0.2);
  --surface: #ffffff;
  --surface-secondary: #f8f8f8;
  --surface-elevated: #ffffff;
  --border: #e5e7eb;
  --border-light: #f0f1f3;
  --purple-soft: rgba(86, 86, 118, 0.06);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  /* Narrow reading column like animations.dev */
  --layout-max: 732px;
  --layout-wide: 1080px;
  --section-gap: 160px;
  --space-unit: 24px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--surface);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

/* ═══ Layout (animations.dev-style narrow column) ═══ */
.container {
  max-width: var(--layout-max);
  margin: 0 auto;
  padding: 0 16px;
}

.container-wide {
  max-width: var(--layout-wide);
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: var(--section-gap) 0;
}

/* Paragraph & body text */
.paragraph {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-secondary);
}

.paragraph-large {
  font-size: 18px;
  line-height: 1.7;
}

.paragraph strong {
  color: var(--ink);
  font-weight: 600;
}

/* ═══ Typography ═══ */
.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

.subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink-secondary);
  max-width: 540px;
}

.mb-6 { margin-bottom: 24px; }
.font-weight-600 { font-weight: 600; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-header {
  margin-bottom: 64px;
}

.section-header .subtitle {
  margin-top: 16px;
}

/* ═══ Navigation ═══ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.nav-inner {
  max-width: var(--layout-wide);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-tertiary);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--ink);
  text-decoration: none;
}

/* ═══ Nav actions ═══ */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  display: flex;
  border-radius: 8px;
  overflow: hidden;
  border: 1.5px solid var(--border);
}

.lang-btn {
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  background: var(--surface);
  color: var(--ink-tertiary);
  transition: background 0.15s, color 0.15s;
  line-height: 1.4;
}

.lang-btn.active {
  background: var(--ink);
  color: #fff;
}

.lang-btn:hover:not(.active) {
  background: var(--surface-secondary);
  color: var(--ink);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.nav-btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-btn--donate {
  background: var(--surface);
  color: var(--ink);
  border: 1.5px solid var(--border);
}

.nav-btn--donate:hover {
  border-color: var(--ink-tertiary);
}

.nav-btn--download {
  background: var(--accent);
  color: #fff;
  border: 1.5px solid var(--accent);
}

.nav-btn--download:hover {
  background: #e0007f;
  border-color: #e0007f;
}

/* ═══ Hero ═══ */
.hero {
  padding-top: 160px;
  padding-bottom: 80px;
  text-align: center;
}

.hero .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero .subtitle {
  margin-top: 24px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 32px;
}

.hero-cta {
  margin-top: 40px;
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  background: var(--ink);
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover {
  background: #1a2332;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
}

.btn-secondary:hover {
  border-color: var(--ink-tertiary);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ═══ Hero image ═══ */
.hero-image {
  margin-top: 64px;
  width: 100%;
  max-width: 960px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.08), 0 4px 16px rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-light);
}

/* ═══ Image preview trigger ═══ */
.img-preview-trigger {
  display: block;
  width: 100%;
  padding: 0;
  margin: 0;
  border: none;
  background: none;
  cursor: pointer;
  overflow: hidden;
}

.img-preview-trigger img {
  width: 100%;
  height: auto;
  display: block;
  vertical-align: middle;
  transition: opacity 0.2s;
}

.img-preview-trigger:hover img {
  opacity: 0.92;
}

.hero-image .img-preview-trigger { border-radius: 16px; }
.mode-card-image .img-preview-trigger { border-radius: 0; }
.showcase-image .img-preview-trigger {
  border-radius: 16px;
  max-width: 420px;
  margin: 0 auto;
}

.img-plugin img {
  aspect-ratio: 9 / 14;
  object-fit: cover;
}

.mode-card-image .img-preview-trigger img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ═══ Image modal (lightbox) ═══ */
.img-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
}

.img-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.img-modal[hidden] { display: none; }
.img-modal.is-open[hidden] { display: flex !important; }

.img-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  cursor: pointer;
}

.img-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.img-modal-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.img-modal-content {
  position: relative;
  z-index: 1;
  max-width: 95vw;
  max-height: 95vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.img-modal-img {
  max-width: 100%;
  max-height: 95vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
}

/* ═══ Image placeholder (fallback) ═══ */
.img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--surface-secondary);
  border: 2px dashed var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 32px;
  text-align: center;
}

.img-placeholder .ph-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--purple-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-tertiary);
}

.img-placeholder .ph-icon svg {
  width: 24px;
  height: 24px;
  color: var(--ink-tertiary);
}

.img-placeholder .ph-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink-secondary);
}

.img-placeholder .ph-desc {
  font-size: 0.8125rem;
  color: var(--ink-tertiary);
  max-width: 360px;
  line-height: 1.5;
}

.img-placeholder.tall { aspect-ratio: 4 / 3; }
.img-placeholder.square { aspect-ratio: 1 / 1; }
.img-placeholder.wide { aspect-ratio: 2.2 / 1; }
.img-placeholder.plugin-ui { aspect-ratio: 9 / 14; max-width: 420px; }

/* ═══ Features grid ═══ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px;
  border-radius: 16px;
  background: var(--surface-secondary);
  border: 1px solid var(--border-light);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  border-color: var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.feature-card h3 {
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

/* ═══ Showcase (side-by-side) ═══ */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.showcase-row.reverse {
  direction: rtl;
}

.showcase-row.reverse > * {
  direction: ltr;
}

.showcase-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.showcase-text h3 {
  font-size: 1.5rem;
}

.showcase-text p {
  color: var(--ink-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.showcase-image {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--border-light);
}

/* ═══ Modes comparison ═══ */
.modes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.mode-card {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-light);
  background: var(--surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.mode-card:hover {
  border-color: var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.mode-card-image {
  width: 100%;
  background: var(--surface-secondary);
}

.mode-card-body {
  padding: 24px;
}

.mode-card-body h3 {
  margin-bottom: 6px;
}

.mode-card-body p {
  font-size: 0.875rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.mode-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 10px;
}

/* ═══ Settings list ═══ */
.settings-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.settings-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.settings-list li::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 9px;
}

/* ═══ Steps ═══ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  counter-reset: step;
}

.step {
  counter-increment: step;
  position: relative;
}

.step::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.step h3 {
  margin-bottom: 8px;
  font-size: 1.0625rem;
}

.step p {
  font-size: 0.875rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

/* ═══ API key callout ═══ */
.callout {
  padding: 32px;
  border-radius: 16px;
  background: var(--surface-secondary);
  border: 1px solid var(--border-light);
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.callout-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.callout-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.callout-body h3 {
  margin-bottom: 6px;
}

.callout-body p {
  font-size: 0.9375rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.callout-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(0,0,0,0.05);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ═══ Footer ═══ */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border-light);
  text-align: center;
  color: var(--ink-tertiary);
  font-size: 0.875rem;
}

/* ═══ Divider ═══ */
.section-divider {
  width: 100%;
  height: 1px;
  background: var(--border-light);
}

/* ═══ Responsive ═══ */
@media (max-width: 768px) {
  :root { --section-gap: 96px; }

  .nav-links { display: none; }

  .nav-btn--donate { display: none; }

  .nav-actions { gap: 8px; }

  .features-grid { grid-template-columns: 1fr; }

  .showcase-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .showcase-row.reverse { direction: ltr; }

  .steps { grid-template-columns: 1fr 1fr; }

  .hero-cta { flex-direction: column; }

  .callout { flex-direction: column; }
}

@media (max-width: 480px) {
  .steps { grid-template-columns: 1fr; }
}