/* ============================================================
   TK Copilot — Static Site Styles
   Sci-fi dark design with cosmic background & glassmorphism.
   ============================================================ */

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

:root {
  /* Palette */
  --color-bg-page: #080a12;
  --color-primary: #6c63ff;
  --color-primary-hover: #7b73ff;
  --color-accent: #00d4ff;
  --color-commerce: #44d07b;
  --color-warm: #ffb454;

  --color-text: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-muted: rgba(255, 255, 255, 0.4);

  --color-border: rgba(255, 255, 255, 0.12);
  --color-border-strong: rgba(255, 255, 255, 0.18);

  /* Glass */
  --glass-bg: rgba(12, 14, 24, 0.55);
  --glass-bg-hover: rgba(12, 14, 24, 0.65);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-hover: rgba(108, 99, 255, 0.4);
  --glass-blur: blur(16px);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --surface-card: rgba(11, 14, 24, 0.9);
  --surface-card-hover: rgba(15, 19, 31, 0.96);
  --surface-band: rgba(5, 8, 16, 0.72);

  /* Shadows */
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 40px rgba(108, 99, 255, 0.06);
  --shadow-glow: 0 0 0 1px rgba(108, 99, 255, 0.4), 0 0 24px rgba(108, 99, 255, 0.15);

  /* Typography */
  --font-sans: "Inter", "SF Pro Display", "SF Pro Text", system-ui, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Menlo, monospace;

  /* Dimensions */
  --max-width: 1100px;
  --radius: 10px;
  --radius-lg: 14px;

  /* Motion */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  min-height: 100%;
  scroll-padding-top: 60px;
  font-size: 16px;
  background: var(--color-bg-page);
}

body {
  min-height: 100%;
  position: relative;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: transparent;
  isolation: isolate;
  overflow-x: hidden;
  overflow-x: clip;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image: url("/assets/BACKGROUND.png");
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  pointer-events: none;
  transform: translateZ(0);
}

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

a {
  color: var(--color-primary-hover);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(108, 99, 255, 0.15);
  color: var(--color-primary-hover);
  padding: 0.15em 0.45em;
  border-radius: 6px;
  border: 1px solid rgba(108, 99, 255, 0.2);
}

/* ----- Container ----- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   Header — frosted glass bar
   ============================================================ */
.header {
  background: rgba(8, 10, 18, 0.94);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  display: inline-flex;
  align-items: center;
  color: #ffffff;
}

.logo img {
  width: 86px;
  height: 58px;
  object-fit: contain;
  flex: 0 0 auto;
}

.logo:hover {
  text-decoration: none;
  color: var(--color-primary-hover);
}

.nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav a:hover {
  color: #ffffff;
  text-decoration: none;
}

.nav a[aria-current="page"] {
  color: #ffffff;
}

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1px solid var(--color-border-strong);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.035);
  color: #ffffff;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  font-family: inherit;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.3);
}

.nav-toggle-line {
  display: block;
  width: 17px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.header.nav-open .nav-toggle {
  border-color: rgba(0, 212, 255, 0.34);
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.1), 0 10px 28px rgba(0, 0, 0, 0.28);
}

.header.nav-open .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header.nav-open .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.header.nav-open .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ----- Language Switcher ----- */
.lang-switcher {
  position: relative;
  margin-left: 4px;
  border-left: 1px solid var(--color-border-strong);
  padding-left: 16px;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.lang-toggle:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.04);
}

.lang-arrow {
  transition: transform 0.2s;
}

.lang-switcher.open .lang-arrow {
  transform: rotate(180deg);
}

.lang-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  list-style: none;
  background: rgba(14, 16, 28, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 0;
  min-width: 118px;
  max-height: 70vh;
  overflow-y: auto;
  z-index: 200;
  box-shadow: var(--shadow-lg);
}

.lang-switcher.open .lang-menu {
  display: block;
}

.lang-option {
  padding: 7px 14px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-option:hover {
  color: #ffffff;
  background: rgba(108, 99, 255, 0.15);
}

.lang-option.active {
  color: var(--color-primary-hover);
  background: rgba(108, 99, 255, 0.2);
}

/* ============================================================
   Hero — transparent, content floats on cosmic bg
   ============================================================ */
.hero {
  padding: 68px 0 48px;
  text-align: center;
  position: relative;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.15;
  letter-spacing: -0.03em;
  text-shadow: 0 2px 30px rgba(108, 99, 255, 0.2);
}

.hero-subtitle {
  margin-top: 16px;
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-powered {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.hero-powered a {
  color: var(--color-text-secondary);
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.25);
  text-underline-offset: 3px;
  transition: all var(--transition-fast);
}

.hero-powered a:hover {
  color: #ffffff;
  text-decoration-color: rgba(255, 255, 255, 0.6);
}

/* ----- Buttons ----- */
.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: var(--radius);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-align: center;
  border: none;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, #6c63ff 0%, #00d4ff 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #7b73ff 0%, #1adbff 100%);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4), 0 0 40px rgba(108, 99, 255, 0.15);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-download {
  background: linear-gradient(135deg, #6c63ff 0%, #00d4ff 100%);
  color: #ffffff;
  width: 100%;
  padding: 16px 24px;
  font-size: 1.05rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.3);
}

.btn-download:hover {
  background: linear-gradient(135deg, #7b73ff 0%, #1adbff 100%);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4), 0 0 40px rgba(108, 99, 255, 0.15);
  filter: brightness(1.08);
}

/* ============================================================
   Section Shared Styles
   ============================================================ */
.features h2,
.cs-proof h2,
.tutorials-page h1,
.pricing h2,
.contact h2,
.download h2,
.requirements h2,
.legal h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: 0;
  color: var(--color-text);
}

.hero,
.features,
.cs-proof,
.tutorials-page,
.pricing,
.download,
.requirements,
.privacy,
.legal,
.contact {
  isolation: isolate;
}

.cs-proof,
.download,
.privacy,
.legal {
  background: var(--surface-band);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.motion-reveal {
  opacity: 0;
}

.motion-reveal.is-visible {
  animation: section-reveal 560ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes section-reveal {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tutorials-kicker,
.tutorial-source-label {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  background: rgba(0, 212, 255, 0.08);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.25;
}

.tutorials-page {
  padding: 76px 0 96px;
  position: relative;
}

.tutorials-page .container {
  max-width: min(1440px, calc(100vw - 48px));
}

.tutorials-page-header {
  max-width: 760px;
  margin: 0 auto 42px;
  text-align: center;
}

.tutorials-page h1 {
  margin: 14px auto 16px;
  font-size: 2.4rem;
  line-height: 1.15;
  letter-spacing: 0;
}

.tutorial-manual-layout {
  display: grid;
  grid-template-columns: minmax(236px, 280px) minmax(0, 860px);
  gap: clamp(44px, 6vw, 76px);
  align-items: start;
  justify-content: start;
}

.tutorial-manual-sidebar {
  min-width: 0;
  position: sticky;
  top: 84px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: rgba(12, 14, 24, 0.58);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  padding: 18px;
  max-height: calc(100vh - 112px);
  overflow: auto;
}

.tutorial-manual-sidebar h2 {
  margin-top: 12px;
  color: var(--color-text);
  font-size: 1.05rem;
  line-height: 1.35;
}

.tutorial-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.tutorial-list-item {
  width: 100%;
  min-width: 0;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 13px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.035);
  color: var(--color-text-secondary);
  cursor: pointer;
  font: inherit;
  text-align: left;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.tutorial-list-item:hover,
.tutorial-list-item.active {
  color: #ffffff;
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.1);
}

.tutorial-list-item:hover {
  transform: translateY(-1px);
}

.tutorial-list-number {
  display: grid;
  place-items: center;
  min-height: 32px;
  border-radius: 8px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  background: rgba(0, 212, 255, 0.08);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1;
}

.tutorial-list-text {
  min-width: 0;
  display: grid;
  gap: 5px;
}

.tutorial-list-text strong {
  color: inherit;
  font-size: 0.9rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.tutorial-list-text span {
  color: var(--color-text-muted);
  font-size: 0.78rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.tutorial-shell {
  min-width: 0;
  width: 100%;
}

.tutorial-video-panel {
  min-width: 0;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: rgba(12, 14, 24, 0.58);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.tutorial-video-panel {
  overflow: hidden;
}

.tutorial-video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(108, 99, 255, 0.18), rgba(0, 212, 255, 0.08)),
    rgba(0, 0, 0, 0.4);
}

.tutorial-video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.tutorial-video-copy {
  padding: 24px;
}

.tutorial-source-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.tutorial-source-label {
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.12);
}

.tutorial-video-copy h2 {
  color: var(--color-text);
  font-size: 1.32rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.tutorial-video-copy p {
  margin-top: 10px;
  color: var(--color-text-secondary);
  font-size: 0.94rem;
  line-height: 1.65;
}

.tutorial-provider-note {
  margin-top: 18px;
  color: var(--color-text-secondary);
  font-size: 0.86rem;
  line-height: 1.6;
}

/* ============================================================
   Contact — direct seller onboarding channels
   ============================================================ */
.contact {
  padding: 90px 0;
  position: relative;
}

.contact-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 660px;
  margin: -30px auto 44px;
  font-size: 1rem;
  line-height: 1.7;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(300px, 0.8fr);
  gap: 24px;
  align-items: stretch;
  max-width: 980px;
  margin: 0 auto;
}

.contact-methods {
  display: grid;
  gap: 18px;
}

.contact-card {
  min-width: 0;
  background: var(--surface-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
}

.contact-card-link {
  display: grid;
  align-content: center;
  gap: 8px;
  min-height: 150px;
  color: var(--color-text);
}

.contact-card-link:hover {
  text-decoration: none;
  background: var(--glass-bg-hover);
  border-color: rgba(0, 212, 255, 0.28);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.contact-label {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(0, 212, 255, 0.24);
  background: rgba(0, 212, 255, 0.09);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.25;
}

.contact-card strong {
  color: var(--color-text);
  font-size: 1.08rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.contact-note {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
}

.contact-wechat-card {
  display: grid;
  gap: 18px;
  align-content: start;
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(12, 18, 30, 0.62);
}

.contact-wechat-copy {
  display: grid;
  gap: 8px;
}

.contact-wechat-image {
  width: 100%;
  max-width: 330px;
  justify-self: center;
  border-radius: var(--radius);
  background: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.32);
}

/* ============================================================
   Features — glass cards
   ============================================================ */
.features {
  padding: 90px 0;
  position: relative;
}

.section-heading {
  max-width: 820px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  margin-bottom: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(68, 208, 123, 0.28);
  background: rgba(68, 208, 123, 0.09);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 800;
  line-height: 1.25;
}

.section-heading h2 {
  margin-bottom: 14px;
}

.section-heading p {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card {
  position: relative;
  min-height: 238px;
  background: var(--surface-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  overflow: hidden;
}

.feature-card::after {
  content: "";
  position: absolute;
  inset: auto 18px 18px auto;
  width: 54px;
  height: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  transition: background var(--transition-normal), width var(--transition-normal);
}

.feature-card:hover {
  background: var(--surface-card-hover);
  border-color: rgba(68, 208, 123, 0.28);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.feature-card:hover::after {
  width: 78px;
  background: linear-gradient(90deg, var(--color-commerce), var(--color-accent));
}

.feature-card-live {
  border-color: rgba(68, 208, 123, 0.3);
  background: rgba(13, 28, 23, 0.92);
}

.feature-card-next {
  border-color: rgba(255, 180, 84, 0.25);
  background: rgba(28, 22, 14, 0.9);
}

.feature-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 26px;
  margin-bottom: 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.055);
  font-size: 0.76rem;
  font-weight: 850;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ============================================================
   Customer Service Proof — outcome dashboard
   ============================================================ */
.cs-proof {
  padding: 76px 0;
  position: relative;
}

.cs-proof-heading {
  text-align: center;
  max-width: 790px;
  margin: 0 auto 28px;
}

.cs-proof-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  margin-bottom: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  background: rgba(0, 212, 255, 0.08);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.25;
}

.cs-proof-heading h2 {
  margin-bottom: 12px;
}

.cs-proof-heading p {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.cs-proof-metrics {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.cs-metric-card {
  min-width: 0;
  padding: 18px 16px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
}

.cs-metric-card:hover {
  background: rgba(12, 18, 30, 0.68);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-md), var(--glass-highlight);
  transform: translateY(-2px);
}

.cs-metric-card-featured {
  border-color: rgba(0, 212, 255, 0.28);
  background: rgba(12, 18, 30, 0.64);
}

.cs-metric-card span {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.35;
}

.cs-metric-card strong {
  display: block;
  margin-top: 8px;
  color: #ffffff;
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.cs-metric-card p {
  margin-top: 8px;
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  line-height: 1.45;
}

.cs-proof-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

.cs-proof-compare,
.cs-proof-ops {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  padding: 18px;
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.cs-proof-compare:hover,
.cs-proof-ops:hover {
  background: rgba(12, 14, 24, 0.62);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: var(--shadow-md), var(--glass-highlight);
}

.cs-proof-compare h3,
.cs-proof-ops h3 {
  color: var(--color-text);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.35;
}

.cs-compare-scroll {
  margin-top: 14px;
  overflow-x: visible;
}

.cs-compare-matrix {
  display: grid;
  grid-template-columns: minmax(92px, 0.55fr) repeat(2, minmax(120px, 1fr)) minmax(150px, 1.1fr);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.035);
  width: 100%;
  overflow: hidden;
}

.cs-compare-axis,
.cs-compare-head,
.cs-compare-row-label,
.cs-compare-cell {
  min-width: 0;
  padding: 12px 14px;
  border-right: 1px solid rgba(255, 255, 255, 0.07);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  overflow-wrap: anywhere;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.cs-compare-head {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1.35;
}

.cs-compare-head-generic,
.cs-compare-cell-generic {
  background: rgba(255, 207, 112, 0.035);
}

.cs-compare-head-rivon,
.cs-compare-cell-rivon {
  background: rgba(0, 212, 255, 0.07);
  box-shadow: inset 1px 0 0 rgba(0, 212, 255, 0.12);
}

.cs-compare-row-label {
  color: var(--color-text-muted);
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.35;
}

.cs-compare-cell {
  color: var(--color-text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.4;
}

.cs-compare-cell-rivon {
  color: #ffffff;
}

.cs-compare-head:hover,
.cs-compare-row-label:hover,
.cs-compare-cell:hover {
  background: rgba(255, 255, 255, 0.075);
  color: #ffffff;
}

.cs-compare-head-generic:hover,
.cs-compare-cell-generic:hover {
  background: rgba(255, 207, 112, 0.1);
}

.cs-compare-head-rivon:hover,
.cs-compare-cell-rivon:hover {
  background: rgba(0, 212, 255, 0.14);
}

.cs-compare-matrix > :nth-child(4n) {
  border-right: none;
}

.cs-compare-matrix > :nth-last-child(-n + 4) {
  border-bottom: none;
}

.cs-op-item {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.035);
  padding: 12px 14px;
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
}

.cs-op-item:hover {
  background: rgba(0, 212, 255, 0.07);
  border-color: rgba(0, 212, 255, 0.24);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  transform: translateY(-2px);
}

.cs-op-item span {
  color: #ffffff;
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.35;
}

.cs-op-item p {
  margin-top: 6px;
  color: var(--color-text-secondary);
  font-size: 0.82rem;
  line-height: 1.55;
}

.cs-ops-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.cs-op-item:last-child {
  grid-column: auto;
}

.cs-proof-note {
  margin: 14px auto 0;
  max-width: 760px;
  color: var(--color-text-muted);
  text-align: center;
  font-size: 0.82rem;
  line-height: 1.6;
}

/* ============================================================
   Pricing — compact billing cards
   ============================================================ */
.pricing {
  padding: 90px 0;
  position: relative;
}

.pricing-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: -30px auto 44px;
  font-size: 1rem;
  line-height: 1.7;
}

.pricing-onboarding-offer {
  display: grid;
  grid-template-columns: minmax(184px, auto) minmax(0, 1fr) minmax(260px, 0.72fr);
  gap: 22px;
  align-items: center;
  margin: 0 0 28px;
  padding: 22px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  border-radius: var(--radius-lg);
  background: rgba(12, 18, 30, 0.58);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.pricing-onboarding-offer-mark {
  box-sizing: border-box;
  width: clamp(184px, 11vw, 204px);
  min-height: 112px;
  padding: 16px 14px;
  display: grid;
  place-items: center;
  align-content: center;
  border: 1px solid rgba(0, 212, 255, 0.26);
  border-radius: var(--radius);
  background: rgba(0, 212, 255, 0.1);
  color: #ffffff;
  text-align: center;
}

.pricing-onboarding-offer-mark span {
  display: block;
  max-width: 100%;
  font-size: clamp(1.36rem, 1.55vw, 1.58rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: 0;
  overflow-wrap: normal;
  text-wrap: balance;
  word-break: keep-all;
}

.pricing-onboarding-offer-mark small {
  display: block;
  margin-top: 8px;
  padding: 0 10px;
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

html[lang="en"] .pricing-onboarding-offer-mark span {
  white-space: nowrap;
}

.pricing-onboarding-offer-copy h3 {
  color: var(--color-text);
  font-size: 1.16rem;
  font-weight: 750;
  line-height: 1.3;
}

.pricing-onboarding-offer-copy p {
  margin-top: 8px;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.pricing-onboarding-offer-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.pricing-onboarding-offer-list li {
  position: relative;
  padding-left: 18px;
  color: var(--color-text-secondary);
  font-size: 0.86rem;
  line-height: 1.45;
}

.pricing-onboarding-offer-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.pricing-modules-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.pricing-modules-heading h3,
.pricing-ai-copy h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--color-text);
}

.pricing-modules-heading p,
.pricing-ai-copy p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.pricing-modules-heading p {
  text-align: right;
}

.pricing-modules-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.pricing-trial-stack {
  display: contents;
}

.pricing-card {
  min-width: 0;
  background: var(--surface-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.pricing-card:hover {
  background: var(--surface-card-hover);
  border-color: rgba(108, 99, 255, 0.32);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.pricing-card-featured {
  border-color: rgba(0, 212, 255, 0.26);
  background: rgba(12, 18, 30, 0.62);
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 24px 22px;
}

.pricing-card-trial {
  min-height: 0;
}

.pricing-card-top {
  display: grid;
  gap: 10px;
  min-height: 58px;
}

.pricing-badge {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 24px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.25;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.pricing-badge-paid {
  color: #ffffff;
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.12);
}

.pricing-card h4 {
  color: var(--color-text);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.pricing-price {
  margin-top: 16px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.25;
}

.pricing-price-main {
  color: #ffffff;
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: 0;
  margin-right: 4px;
}

.pricing-price-trial {
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 750;
}

.pricing-desc,
.pricing-footnote {
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.pricing-desc {
  margin-top: 12px;
  font-size: 0.9rem;
}

.pricing-footnote {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.pricing-group-note {
  margin-top: 16px;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.pricing-ai-panel {
  margin-top: 22px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(12, 14, 24, 0.32);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.pricing-ai-copy {
  display: grid;
  grid-template-columns: minmax(180px, 0.7fr) minmax(0, 1.3fr);
  gap: 18px;
  align-items: start;
  margin-bottom: 16px;
}

.pricing-ai-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.pricing-ai-tier {
  min-width: 0;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.035);
}

.pricing-ai-tier span {
  display: inline-block;
  color: var(--color-text-muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.pricing-ai-tier h4 {
  margin-top: 8px;
  color: var(--color-text);
  font-size: 0.96rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.pricing-ai-tier strong {
  color: #ffffff;
  font-size: 1.35rem;
  font-weight: 800;
}

.pricing-ai-price {
  margin-top: 8px;
  color: var(--color-text-secondary);
  font-size: 0.84rem;
}

.pricing-ai-multiplier {
  margin-top: 12px;
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.35;
}

.pricing-ai-coverage {
  margin-top: 6px;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

/* ============================================================
   Download — glass cards
   ============================================================ */
.download {
  padding: 90px 0;
  position: relative;
}

.download-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-top: -32px;
  margin-bottom: 48px;
  font-size: 1rem;
}

.version {
  font-weight: 600;
  background: linear-gradient(135deg, #6c63ff, #00d4ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1050px;
  margin: 0 auto;
}

.download-card {
  background: var(--surface-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  display: flex;
  flex-direction: column;
}

.download-card:hover {
  background: var(--surface-card-hover);
  border-color: rgba(108, 99, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.download-os {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-text);
}

.download-meta {
  margin-top: 20px;
}

.download-version {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.download-hash {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  word-break: break-all;
}

.hash-label {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.hash-value {
  font-size: 0.75rem;
}

/* Split button (macOS arch picker) */
.split-btn {
  position: relative;
  display: inline-flex;
  width: 100%;
}

.split-btn .split-btn-main {
  flex: 1;
  width: auto;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.split-btn .split-btn-main:hover {
  transform: none;
}

.split-btn-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  border: none;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  border-top-right-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
  background: linear-gradient(135deg, #6c63ff 0%, #00d4ff 100%);
  color: #fff;
  cursor: pointer;
  font-size: 0.75rem;
  transition: filter var(--transition-normal);
}

.split-btn-toggle:hover {
  filter: brightness(1.12);
}

.split-btn-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  z-index: 10;
}

.split-btn.open .split-btn-menu {
  display: block;
}

.split-btn-option {
  display: block;
  padding: 10px 16px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.88rem;
  transition: background 0.15s ease;
}

.split-btn-option:hover {
  background: rgba(108, 99, 255, 0.15);
  text-decoration: none;
}

.split-btn-option.split-btn-active {
  background: rgba(108, 99, 255, 0.1);
}

.split-btn-option + .split-btn-option {
  border-top: 1px solid var(--glass-border);
}

.download-note {
  text-align: center;
  margin-top: 36px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   Requirements — glass cards
   ============================================================ */
.requirements {
  padding: 90px 0;
  position: relative;
}

.requirements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1050px;
  margin: 0 auto;
}

.requirements-card {
  background: var(--surface-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm), var(--glass-highlight);
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
}

.requirements-card:hover {
  background: var(--surface-card-hover);
  border-color: rgba(108, 99, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.requirements-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.requirements-card ul {
  list-style: none;
  padding: 0;
}

.requirements-card li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.requirements-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #6c63ff, #00d4ff);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(108, 99, 255, 0.5);
}

/* ============================================================
   Privacy — glass cards with list items
   ============================================================ */
.privacy {
  padding: 90px 0;
  position: relative;
}

.privacy h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.privacy-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 48px;
  font-size: 1rem;
  line-height: 1.7;
}

.privacy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1050px;
  margin: 0 auto;
}

.privacy-card {
  background: var(--surface-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  box-shadow: var(--shadow-sm), var(--glass-highlight);
}

.privacy-card:hover {
  background: var(--surface-card-hover);
  border-color: rgba(108, 99, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.privacy-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--color-text);
}

.privacy-card-note {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}

.privacy-card ul {
  list-style: none;
  padding: 0;
}

.privacy-card li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.privacy-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, #6c63ff, #00d4ff);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(108, 99, 255, 0.5);
}


.privacy-footer-note {
  text-align: center;
  margin-top: 40px;
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   Legal — compact public company information
   ============================================================ */
.legal {
  padding: 52px 0 42px;
  position: relative;
}

.legal-inner {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.28fr);
  gap: 28px;
  align-items: start;
  max-width: 980px;
}

.legal-copy h2 {
  text-align: left;
  margin-bottom: 10px;
  font-size: 1.35rem;
}

.legal-copy p {
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

.legal-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 22px;
  margin: 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--color-border);
}

.legal-list div {
  min-width: 0;
}

.legal-list dt {
  color: var(--color-text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.35;
  text-transform: uppercase;
}

.legal-list dd {
  margin-top: 4px;
  color: var(--color-text);
  font-size: 0.94rem;
  font-weight: 650;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.legal-list address {
  font-style: normal;
}

.legal-list a {
  color: var(--color-text);
  text-decoration-color: rgba(255, 255, 255, 0.25);
  text-underline-offset: 3px;
}

/* ============================================================
   Footer — semi-transparent
   ============================================================ */
.footer {
  background: rgba(8, 10, 18, 0.7);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 32px 0;
  text-align: center;
}

.footer p {
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

.footer a {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: #ffffff;
}

.footer-icp {
  margin-top: 8px;
  font-size: 0.72rem;
  opacity: 0.45;
}

.footer-icp a {
  font-weight: 400;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 980px) {
  .tutorials-page .container {
    max-width: var(--max-width);
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tutorial-manual-layout {
    grid-template-columns: minmax(220px, 240px) minmax(0, 1fr);
    gap: 28px;
  }

  .cs-proof-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cs-compare-scroll {
    overflow-x: auto;
  }

  .cs-compare-matrix {
    min-width: 640px;
  }

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

  .cs-op-item:last-child {
    grid-column: auto;
  }

}

@media (max-width: 768px) {
  .hero {
    padding: 46px 0 50px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .cs-proof-metrics,
  .cs-ops-grid {
    grid-template-columns: 1fr;
  }

  .cs-proof-heading {
    margin-bottom: 26px;
  }

  .cs-metric-card {
    padding: 18px;
  }

  .pricing-modules-heading,
  .pricing-ai-copy {
    display: block;
  }

  .pricing-onboarding-offer {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 18px;
  }

  .pricing-onboarding-offer-mark {
    width: 100%;
    min-height: 82px;
    grid-template-columns: auto auto;
    gap: 10px;
    justify-content: center;
  }

  .pricing-onboarding-offer-mark small {
    margin-top: 0;
    padding: 0;
    text-align: left;
  }

  .pricing-modules-heading p,
  .pricing-ai-copy p {
    margin-top: 4px;
    text-align: left;
  }

  .pricing-modules-layout,
  .pricing-ai-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .contact-methods {
    gap: 14px;
  }

  .pricing-card-featured {
    padding: 26px 22px;
  }

  .pricing-ai-panel {
    padding: 18px;
  }

  .pricing-card-top {
    min-height: auto;
  }

  .legal-inner {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .legal-copy h2 {
    text-align: center;
  }

  .legal-copy p {
    text-align: center;
  }

  .download-grid,
  .requirements-grid,
  .privacy-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .header {
    position: sticky;
  }

  .header-inner {
    height: 62px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 16px;
    right: 16px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
    background: rgba(10, 12, 22, 0.92);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top right;
    transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal);
  }

  .header.nav-open .nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
  }

  .nav a {
    display: flex;
    min-height: 42px;
    align-items: center;
    padding: 0 12px;
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.78);
    font-size: 0.92rem;
    line-height: 1.2;
  }

  .nav a:hover,
  .nav a[aria-current="page"] {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
  }

  .nav .lang-switcher {
    width: 100%;
    margin: 8px 0 0;
    padding: 10px 0 0;
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav .lang-toggle {
    width: 100%;
    min-height: 40px;
    justify-content: center;
    border-radius: 8px;
  }

  .nav .lang-menu {
    left: 0;
    right: 0;
    transform: none;
    width: 100%;
    min-width: 0;
  }

  .features,
  .cs-proof,
  .tutorials-page,
  .pricing,
  .contact,
  .download,
  .requirements,
  .privacy,
  .legal {
    padding: 60px 0;
  }

  .tutorial-manual-layout {
    grid-template-columns: 1fr;
  }

  .tutorial-manual-sidebar {
    position: static;
    max-height: none;
  }

  .tutorial-list {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
}

@media (min-width: 769px) and (pointer: fine) and (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
  }

  body > section {
    scroll-snap-align: start;
    scroll-snap-stop: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 480px) {
  .header-inner {
    height: 58px;
  }

  .lang-switcher {
    border-left: none;
    padding-left: 0;
  }

  .lang-menu {
    right: auto;
    left: 50%;
    transform: translateX(-50%);
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    line-height: 1.62;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .contact-card {
    padding: 20px;
  }

  .tutorials-page h1 {
    font-size: 1.8rem;
  }

  .tutorial-video-copy {
    padding: 18px;
  }

  .tutorial-list {
    grid-template-columns: 1fr;
  }

  .contact-card-link {
    min-height: 132px;
  }

  .legal-list {
    grid-template-columns: 1fr;
  }

  .cs-proof-compare,
  .cs-proof-ops {
    padding: 18px;
  }

  .cs-metric-card strong {
    font-size: 1.55rem;
  }
}