@font-face {
  font-family: "Plus Jakarta Sans";
  src: url("./fonts/PlusJakartaSans-VariableFont_wght.ttf") format("truetype");
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "OpenDyslexic";
  src: url("./fonts/OpenDyslexic-Regular.otf") format("opentype");
  font-weight: 400;
  font-display: swap;
}

:root {
  --radius-sm: 5px;
  --radius-full: 999px;
  --shadow-soft: none;
  --font-ui: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  --font-reading: Georgia, "Times New Roman", serif;
  --font-dyslexic: "OpenDyslexic", "Trebuchet MS", sans-serif;
  --demo-readable-width: 48ch;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 64px;
}

html[data-theme="dark"] {
  --bg: #01161e;
  --surface: #124559;
  --surface-strong: #00131a;
  --surface-soft: rgba(18, 69, 89, 0.78);
  --text: #eff6e0;
  --text-soft: #aec3b0;
  --line: rgba(174, 195, 176, 0.55);
  --accent: #598392;
  --accent-soft: rgba(89, 131, 146, 0.22);
  --reading-text: rgba(239, 246, 224, 0.96);
  --window-bg: #031c24;
  --hero-card-text: #eff6e0;
  --mark: rgba(239, 246, 224, 0.28);
  --accent-contrast: #eff6e0;
}

html[data-theme="light"] {
  --bg: #f4f8f9;
  --surface: #e0eaec;
  --surface-strong: #d2dde0;
  --surface-soft: rgba(224, 234, 236, 0.88);
  --text: #124559;
  --text-soft: #7a9aa8;
  --line: rgba(122, 154, 168, 0.5);
  --accent: #598392;
  --accent-soft: rgba(89, 131, 146, 0.18);
  --reading-text: rgba(18, 69, 89, 0.92);
  --window-bg: #f8fbfc;
  --hero-card-text: #124559;
  --mark: rgba(89, 131, 146, 0.22);
  --accent-contrast: #f4f8f9;
}

html[data-theme="sepia"] {
  --bg: #f5ead6;
  --surface: #e8d5b7;
  --surface-strong: #ddc6a3;
  --surface-soft: rgba(232, 213, 183, 0.88);
  --text: #124559;
  --text-soft: #9c8465;
  --line: rgba(156, 132, 101, 0.46);
  --accent: #598392;
  --accent-soft: rgba(89, 131, 146, 0.16);
  --reading-text: rgba(18, 69, 89, 0.92);
  --window-bg: #fbf2e3;
  --hero-card-text: #124559;
  --mark: rgba(89, 131, 146, 0.2);
  --accent-contrast: #f5ead6;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at top, color-mix(in srgb, var(--surface) 18%, transparent), transparent 42%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

.site-shell {
  width: min(1280px, calc(100% - 40px));
  margin: 0 auto;
  padding-bottom: var(--space-10);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding: 18px max(20px, calc((100vw - 1280px) / 2));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
}

.brand-logo {
  width: 132px;
  height: auto;
  display: block;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  color: var(--text-soft);
  font-size: 0.95rem;
}

.header-nav a:hover,
.header-nav a:focus-visible {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* ── Hamburger toggle ──────────────────────────────── */

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 160ms ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background: var(--accent-soft);
}

.icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.theme-switcher,
.control-row {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.control-row {
  width: 100%;
}

.theme-switcher {
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--surface);
}

.theme-switch,
.control-chip,
.button,
.reader-demo-footer button {
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.theme-switch {
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--text-soft);
  padding: 0.72rem 0.98rem;
  cursor: pointer;
}

.theme-switch:last-child {
  border-right: 0;
}

.theme-switch:hover,
.theme-switch:focus-visible,
.theme-switch.active,
.control-chip:hover,
.control-chip:focus-visible,
.control-chip.active {
  background: color-mix(in srgb, var(--accent) 88%, var(--surface-strong));
  color: var(--accent-contrast);
}

.control-chip:hover,
.control-chip:focus-visible,
.control-chip.active {
  border-color: transparent;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.76rem 1.16rem;
  border: none;
  border-radius: var(--radius-sm);
}

.button:hover,
.button:focus-visible,
.reader-demo-footer button:hover,
.reader-demo-footer button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: color-mix(in srgb, var(--accent) 88%, var(--surface-strong));
  color: var(--accent-contrast);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--text);
  color: var(--bg);
}

.button-secondary,
.reader-demo-footer button {
  background: transparent;
  color: var(--text);
}

.button-secondary {
  border: 1px solid var(--line);
}

.button-secondary:hover,
.button-secondary:focus-visible,
.reader-demo-footer button:hover,
.reader-demo-footer button:focus-visible {
  background: var(--accent-soft);
}

.hero-section,
.preview-section,
.features-section,
.beta-section {
  padding-top: var(--space-10);
}

.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: var(--space-8);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  margin-bottom: var(--space-4);
  color: var(--text-soft);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}

.hero-copy h1,
.section-heading h2,
.beta-card h2 {
  margin: 0;
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.hero-copy h1 {
  font-size: clamp(3rem, 5vw, 5rem);
}

.section-heading h2,
.beta-card h2 {
  font-size: clamp(2.1rem, 3vw, 3rem);
}

.hero-lead,
.section-heading p,
.beta-card p {
  margin: var(--space-4) 0 0;
  color: var(--text-soft);
  line-height: 1.7;
  max-width: 62ch;
}

.hero-actions,
.platform-row,
.beta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.beta-actions {
    justify-content: space-around;
}

.hero-actions,
.platform-row {
  margin-top: var(--space-6);
}

.platform-pill {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0.6rem 0.9rem;
  border: none;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  color: var(--text);
}

.hero-screenshot-stage,
.preview-controls,
.reader-demo-window,
.beta-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  box-shadow: var(--shadow-soft);
}

.hero-screenshot-stage {
  position: relative;
  padding: 18px;
  overflow: hidden;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--surface) 56%, transparent), transparent),
    color-mix(in srgb, var(--surface) 90%, transparent);
}

.hero-screenshot-main,
.hero-screenshot-thumb {
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  border-radius: var(--radius-sm);
  background: var(--surface-strong);
}

.hero-screenshot-main {
  box-shadow: none;
}

.hero-screenshot-main img,
.hero-screenshot-thumb img {
  display: block;
  width: 100%;
  height: auto;
}

.hero-screenshot-thumbs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.hero-screenshot-thumb {
  margin: 0;
  padding: 0;
  cursor: pointer;
  opacity: 0.7;
  appearance: none;
  transition: opacity 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.hero-screenshot-thumb.active {
  opacity: 1;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.hero-screenshot-thumb:hover,
.hero-screenshot-thumb:focus-visible {
  opacity: 1;
  border-color: color-mix(in srgb, var(--accent) 88%, transparent);
}

.hero-screenshot-thumb img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.reader-demo-header,
.reader-demo-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-strong);
}

.reader-demo-progress-track {
  height: 6px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--text) 14%, transparent);
  overflow: hidden;
}

.reader-demo-progress-fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent);
}

.preview-section {
  display: grid;
  gap: var(--space-7);
}

.features-section {
  display: grid;
  gap: var(--space-6);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.feature-card {
  border: none;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  box-shadow: var(--shadow-soft);
  padding: var(--space-5);
}

.feature-card h3 {
  margin: 0;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}

.feature-card p {
  margin: var(--space-3) 0 0;
  color: var(--text-soft);
  line-height: 1.65;
}

.section-heading {
  max-width: 760px;
}

.preview-interactive {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.preview-controls {
  padding: 22px;
  overflow: auto;
}

.reader-demo-shell {
  min-width: 0;
  overflow: hidden;
}

.control-block + .control-block {
  margin-top: 20px;
}

.control-heading {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10px;
}

.control-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.95rem;
  font-weight: 600;
}

.control-value {
  color: var(--text-soft);
  font-size: 0.88rem;
}

.control-row-3up .control-chip {
  flex: 1 1 calc(33.333% - 8px);
}

.control-chip {
  min-height: 40px;
  padding: 0.66rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
}

.control-row .control-chip {
  flex: 1 1 0;
}

.control-range {
  width: 100%;
  margin: 0;
  appearance: none;
  background: transparent;
}

.control-range:focus {
  outline: none;
}

.control-range::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--text) 14%, transparent);
}

.control-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--accent);
}

.control-range::-moz-range-track {
  height: 6px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--text) 14%, transparent);
}

.control-range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--accent);
}

.reader-demo-window {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.reader-demo-header {
  color: var(--text);
}

.reader-demo-header strong {
  display: block;
  font-size: 1rem;
  color: var(--text);
}

.reader-demo-header span {
  display: block;
  margin-top: 4px;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.reader-demo-stage {
  position: relative;
  padding: 28px 22px 22px;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  flex: 1;
  overflow: hidden;
}

.reader-demo-scrollbar {
  display: none;
  position: absolute;
  top: 28px;
  right: 14px;
  bottom: 22px;
  width: 6px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--text) 8%, transparent);
}

.reader-demo-scrollbar span {
  display: block;
  width: 100%;
  height: 96px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--accent) 88%, transparent);
}

.reader-demo-page-wrap {
  min-width: 0;
  height: 100%;
  overflow: hidden;
  scroll-behavior: smooth;
}

.reader-demo-page {
  max-width: 100%;
  height: 100%;
  color: var(--reading-text);
  font-family: var(--font-reading);
  font-size: var(--demo-font-size, 19px);
  line-height: var(--demo-line-height, 1.82);
  column-count: 2;
  column-gap: 92px;
  column-fill: auto;
}

.reader-demo-page p {
  margin: 0 0 var(--demo-paragraph-spacing, 19px);
  break-inside: avoid;
}

.reader-demo-window[data-font="serif"] .reader-demo-page {
  font-family: var(--font-reading);
}

.reader-demo-window[data-font="sans"] .reader-demo-page {
  font-family: var(--font-ui);
}

.reader-demo-window[data-font="dyslexic"] .reader-demo-page {
  font-family: var(--font-dyslexic);
}

.reader-demo-window[data-align="left"] .reader-demo-page {
  text-align: left;
}

.reader-demo-window[data-align="justify"] .reader-demo-page {
  text-align: justify;
}

.reader-demo-window[data-align="center"] .reader-demo-page {
  text-align: center;
}

.reader-demo-window[data-mode="single"] .reader-demo-page {
  column-count: 1;
  column-gap: 0;
}

.reader-demo-window[data-mode="single"] .reader-demo-page-wrap {
  width: 100%;
  margin-inline: 0;
}

.reader-demo-window[data-mode="single"] .reader-demo-page p,
.reader-demo-window[data-mode="continuous"] .reader-demo-page p {
  max-width: var(--demo-readable-width);
  margin-inline: auto;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-stage {
  padding-right: 30px;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-page-wrap {
  width: 100%;
  margin-inline: 0;
  overflow: auto;
  padding-right: 18px;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-page-wrap::-webkit-scrollbar {
  width: 8px;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-page-wrap::-webkit-scrollbar-track {
  background: transparent;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-page-wrap::-webkit-scrollbar-thumb {
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--accent) 82%, transparent);
}

.reader-demo-window[data-mode="continuous"] .reader-demo-page {
  width: 100%;
  max-width: none;
  height: auto;
  column-count: 1;
  column-gap: 0;
  padding-inline: 0;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-scrollbar {
  display: block;
}

.reader-demo-window[data-mode="continuous"] .reader-demo-page-wrap::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.reader-demo-footer {
  border-top: 1px solid var(--line);
  border-bottom: 0;
}

.reader-demo-footer button {
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  cursor: pointer;
}

.reader-demo-progress {
  display: grid;
  gap: 8px;
  width: min(100%, 520px);
}

.reader-demo-progress span {
  text-align: center;
  color: var(--text-soft);
}

.reader-demo-progress-fill {
  width: 72%;
}

.beta-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-7);
  border: none;
}

.beta-actions .button {
  min-width: 190px;
}

.utility-page {
  display: grid;
  gap: var(--space-8);
}

.utility-hero {
  align-items: stretch;
}

.utility-highlight {
  align-self: center;
}

.utility-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.utility-list {
  margin: var(--space-3) 0 0;
  padding-left: 1.1rem;
  color: var(--text-soft);
  line-height: 1.75;
}

.utility-list li + li {
  margin-top: 0.35rem;
}

@media (max-width: 1180px) {
  .hero-section,
  .preview-interactive {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 980px) {
  .site-header,
  .beta-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .theme-switcher {
    width: 100%;
  }

  .theme-switch {
    flex: 1;
  }

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

/* ── Forms ────────────────────────────────────────────── */

.form-section {
  padding-top: var(--space-10);
}

.form-card {
  border: none;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  padding: var(--space-8);
  display: grid;
  gap: var(--space-7);
}

.form-header {
  max-width: 640px;
}

.form-header h2 {
  margin: 0;
  font-size: clamp(2.1rem, 3vw, 3rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.form-header p {
  margin: var(--space-4) 0 0;
  color: var(--text-soft);
  line-height: 1.7;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.form-field {
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.form-field-full {
  grid-column: 1 / -1;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.form-hint {
  font-weight: 400;
  color: var(--text-soft);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--bg) 72%, var(--surface));
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  transition: border-color 160ms ease, background 160ms ease;
  appearance: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-soft);
  opacity: 0.7;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: color-mix(in srgb, var(--bg) 88%, var(--surface));
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M4 6l4 4 4-4' stroke='%23598392' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 36px;
  cursor: pointer;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.form-actions {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line);
}

/* ── File upload ───────────────────────────────────── */

.form-file-wrap {
  position: relative;
}

.form-file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.form-file-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.72rem var(--space-4);
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--bg) 72%, var(--surface));
  color: var(--text-soft);
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease;
  width: 100%;
}

.form-file-label:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--bg) 88%, var(--surface));
  color: var(--text);
}

.form-file-chosen {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.85rem;
  color: var(--accent);
  word-break: break-all;
}

.form-field-error .form-input,
.form-field-error .form-select,
.form-field-error .form-textarea {
  border-color: #e05a5a;
}

.form-error-msg {
  font-size: 0.85rem;
  color: #e05a5a;
}

.form-success {
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-7);
  border: 1px solid color-mix(in srgb, var(--accent) 56%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.form-success.visible {
  display: flex;
}

.form-success-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid color-mix(in srgb, var(--accent) 56%, transparent);
  border-radius: var(--radius-sm);
  color: var(--accent);
}

.form-success h3 {
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.form-success p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.65;
}

/* ── Responsive ───────────────────────────────────────── */

@media (min-width: 721px) {
  [data-preview-value="continuous"] {
    min-width: 150px;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100% - 24px, 100%);
  }

  /* Hamburger: collapse nav into toggle */
  .nav-toggle {
    display: inline-flex;
  }

  .site-header {
    flex-direction: row !important;
    align-items: center !important;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .header-nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-3);
    padding: var(--space-4) 0 var(--space-2);
    border-top: 1px solid var(--line);
    flex-wrap: nowrap;
  }

  .header-actions {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding-bottom: var(--space-3);
  }

  .site-header.nav-open .header-nav,
  .site-header.nav-open .header-actions {
    display: flex;
  }

  .hero-copy h1 {
    font-size: 2.55rem;
  }

  .reader-demo-header,
  .reader-demo-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .reader-demo-progress {
    width: 100%;
  }

  .reader-demo-page,
  .reader-demo-window[data-mode="two-column"] .reader-demo-page {
    columns: 1 auto;
  }

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

  .form-field-full {
    grid-column: 1;
  }

  .form-card {
    padding: var(--space-6);
  }
}

/* ── Download modals ────────────────────────────────────────────────────── */
.download-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.download-modal-overlay[hidden] {
  display: none;
}

.download-modal {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  width: min(420px, 100%);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.download-modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.download-modal-head h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text);
}

.download-modal-close {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-soft);
  border-radius: var(--radius-full);
  cursor: pointer;
}

#windowsDownloadBtn,
#linuxDownloadBtn {
  cursor: pointer;
}

.download-modal-close:hover {
  background: var(--accent-soft);
  color: var(--text);
}

.download-modal-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.download-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.download-option:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.download-option-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-option-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.download-option-body strong {
  font-size: 0.9rem;
  color: var(--text);
}

.download-option-body span {
  font-size: 0.78rem;
  color: var(--text-soft);
  line-height: 1.4;
}

.download-option-ext {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-soft);
}

.download-option-warning {
  color: #c07b2a !important;
}