/* QwenCloud App site — aligned with qwencloud.com design system */

/* ===== Light theme (default) — matching main site tokens ===== */
:root,
:root[data-theme="light"],
:root:not([data-theme]) {
  color-scheme: light;
  --qc-bg: #ffffff;
  --qc-bg-deep: #f9fafd;
  --qc-raised: #ffffff;
  --qc-surface: #ffffff;
  --qc-surface-strong: #ffffff;
  --qc-surface-soft: #f2f4f8;
  --qc-text: #0b0c0f;
  --qc-text-muted: #535b6b;
  --qc-text-subtle: #7f8798;
  --qc-blue: #653aff;
  --qc-blue-bright: #5229e6;
  --qc-cyan: #653aff;
  --qc-line: #e6e9ef;
  --qc-line-strong: #d1d7e2;
  --qc-focus: #653aff;
  --qc-radius-sm: 8px;
  --qc-radius-md: 12px;
  --qc-radius-lg: 20px;
  --qc-content: 1360px;
  --qc-gutter: clamp(20px, 4vw, 64px);
  --qc-header-height: 84px;
  --qc-shadow: 0px 8px 24px 0px rgba(83, 91, 107, 0.06);
  --qc-shadow-hover: 0px 16px 40px 0px rgba(83, 91, 107, 0.1);
  --qc-transition: 200ms ease;
  --qc-theme-transition: 220ms ease;
  background: var(--qc-bg);
}

/* ===== Dark theme ===== */
:root[data-theme="dark"] {
  color-scheme: dark;
  --qc-bg: #09090a;
  --qc-bg-deep: #0f1115;
  --qc-raised: #16191d;
  --qc-surface: #1a1e23;
  --qc-surface-strong: #21252b;
  --qc-surface-soft: #21252b;
  --qc-text: #f9fafc;
  --qc-text-muted: #afb7c6;
  --qc-text-subtle: #9098a8;
  --qc-blue: #714ffc;
  --qc-blue-bright: #8466ff;
  --qc-cyan: #714ffc;
  --qc-line: #21252b;
  --qc-line-strong: #2e333e;
  --qc-focus: #714ffc;
  --qc-shadow: 0px 8px 24px 0px rgba(0, 0, 0, 0.28);
  --qc-shadow-hover: 0px 16px 40px 0px rgba(0, 0, 0, 0.38);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { min-width: 320px; background: var(--qc-bg); }
body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background: var(--qc-bg);
  color: var(--qc-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--qc-theme-transition), color var(--qc-theme-transition);
}

.site-header, .glass-card, .feature-card, .scenario-card, .pricing-value, .media-frame, .faq details, .platform-card, .steps-list li, .feature-strip, .genius-section, .site-footer {
  transition: background-color var(--qc-theme-transition), border-color var(--qc-theme-transition), color var(--qc-theme-transition), box-shadow var(--qc-theme-transition);
}

img, svg, video { display: block; max-width: 100%; }
button, a { font: inherit; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { color: var(--qc-blue); }
:where(a, button, summary, input, select, textarea):focus-visible { outline: 2px solid var(--qc-focus); outline-offset: 2px; border-radius: 4px; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: var(--qc-header-height);
  padding: 0 var(--qc-gutter);
  border-bottom: 1px solid var(--qc-line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
:root[data-theme="dark"] .site-header {
  background: rgba(9, 9, 10, 0.88);
}

.site-logo {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 8px 0;
  flex: 0 0 auto;
  text-decoration: none;
}
.site-logo img {
  height: 28px;
  width: auto;
  display: block;
}
.site-logo__dark { display: none; }
:root[data-theme="dark"] .site-logo__light { display: none; }
:root[data-theme="dark"] .site-logo__dark { display: block; }

.site-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.site-nav__link, .site-mobile-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--qc-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--qc-transition), background-color var(--qc-transition);
}
.site-nav__link:hover, .site-mobile-nav a:hover {
  color: var(--qc-text);
  background: var(--qc-surface-soft);
}
.site-nav__link--app {
  color: #ffffff;
  background: var(--qc-text);
  border-radius: 8px;
  font-weight: 600;
}
.site-nav__link--app:hover {
  color: #ffffff;
  background: #242933;
}
:root[data-theme="dark"] .site-nav__link--app {
  background: var(--qc-blue);
  color: #ffffff;
}
:root[data-theme="dark"] .site-nav__link--app:hover {
  background: var(--qc-blue-bright);
}

.language-switch {
  font-weight: 500;
  color: var(--qc-text-muted);
  border: 1px solid var(--qc-line);
  border-radius: 8px;
}
.language-switch:hover {
  color: var(--qc-blue);
  border-color: var(--qc-blue);
  background: transparent;
}

.theme-toggle {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: 1px solid var(--qc-line);
  border-radius: 8px;
  background: var(--qc-surface);
  color: var(--qc-text-muted);
  cursor: pointer;
  transition: color var(--qc-transition), background-color var(--qc-transition), border-color var(--qc-transition);
}
.theme-toggle:hover { color: var(--qc-blue); border-color: var(--qc-line-strong); }
.theme-toggle__icon { display: none; line-height: 1; }
.theme-toggle__icon svg { width: 18px; height: 18px; display: block; }
.theme-toggle[data-theme-state="dark"] .theme-toggle__icon--sun,
.theme-toggle:not([data-theme-state]) .theme-toggle__icon--sun { display: inline; }
.theme-toggle[data-theme-state="light"] .theme-toggle__icon--moon { display: inline; }
.site-mobile-nav .theme-toggle { width: fit-content; justify-self: start; margin: 4px 0; }

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  margin-left: auto;
  padding: 8px 13px;
  border: 1px solid var(--qc-line);
  border-radius: 8px;
  background: var(--qc-surface);
  color: var(--qc-text);
  cursor: pointer;
}
.site-mobile-nav { display: none; }

/* ===== Page Shell ===== */
.page-shell { width: min(var(--qc-content), calc(100% - 2 * var(--qc-gutter))); margin: 0 auto; padding: 32px 0 80px; }
.page-shell__content { min-width: 0; }
.breadcrumbs { margin-bottom: 24px; color: var(--qc-text-subtle); font-size: 0.85rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.breadcrumbs li:not(:last-child)::after { margin-left: 6px; color: var(--qc-line-strong); content: "/"; }
.breadcrumbs a { display: inline-flex; align-items: center; padding: 4px 2px; color: var(--qc-text-muted); line-height: 1.4; }

/* ===== Typography ===== */
h1, h2, h3, h4 { margin: 0 0 0.6em; color: var(--qc-text); line-height: 1.15; letter-spacing: -0.04em; font-weight: 700; }
h1 { max-width: 14ch; font-size: clamp(2.6rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 3rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.5rem); }
p { color: var(--qc-text-muted); }

/* ===== Hero ===== */
.hero, .hero-section {
  position: relative;
  padding: clamp(64px, 9vw, 120px) 0 clamp(48px, 7vw, 88px);
}
.hero::before, .hero-section::before {
  position: absolute;
  z-index: -1;
  inset: -1px -20vw auto;
  height: 28rem;
  background: radial-gradient(ellipse at 60% 10%, rgba(101, 58, 255, 0.06), transparent 68%);
  content: "";
  pointer-events: none;
}
:root[data-theme="dark"] .hero::before,
:root[data-theme="dark"] .hero-section::before {
  background: radial-gradient(ellipse at 60% 10%, rgba(113, 79, 252, 0.12), transparent 68%);
}

.hero__eyebrow, .section-eyebrow {
  margin: 0 0 16px;
  color: var(--qc-blue);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hero__lead, .hero-lead { max-width: 640px; font-size: clamp(1.05rem, 1.8vw, 1.25rem); line-height: 1.6; }

/* ===== Hero Video Background ===== */
.hero--video-bg {
  position: relative;
  display: flex;
  min-height: clamp(540px, 72vh, 760px);
  align-items: center;
  overflow: hidden;
  isolation: isolate;
  border-radius: 20px;
}

.hero--video-bg .hero__copy {
  position: relative;
  z-index: 2;
  width: min(100%, 760px);
}

.hero-bg-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
  opacity: 0.42;
}

.hero--video-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.76);
  z-index: -1;
}

:root[data-theme="dark"] .hero--video-bg::before {
  background: rgba(15, 17, 21, 0.78);
}



/* ===== Cards & Surfaces ===== */
.glass-card, .scenario-card, .pricing-value, .feature-card {
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow);
}
.glass-card { padding: clamp(20px, 3.5vw, 32px); }

.media-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow);
}
.media-frame img, .media-frame picture, .media-frame video { width: 100%; height: auto; }
.media-frame picture { display: block; }
.media-frame figcaption { padding: 10px 16px; color: var(--qc-text-subtle); font-size: 0.8rem; }

/* ===== Sections ===== */
.feature-section, .features, .scenario-section, .pricing-section, .faq, .cta-section {
  padding: clamp(56px, 8vw, 96px) 0;
}
.section-heading { margin-bottom: clamp(28px, 4vw, 48px); }
.section-heading p { margin-bottom: 8px; }

.feature-grid, .features-grid, .scenario-grid, .pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.feature-grid--four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.scenario-grid--five { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.feature-card, .scenario-card, .pricing-value {
  padding: clamp(20px, 3vw, 28px);
}
.feature-card p, .scenario-card p, .pricing-value p { margin-bottom: 0; }

.feature-card:hover, .pricing-value:hover, .platform-card:hover {
  border-color: var(--qc-line-strong);
  box-shadow: var(--qc-shadow-hover);
}

.feature-card__body { padding: clamp(18px, 2.5vw, 28px); }
.feature-card__media {
  overflow: hidden;
  border-radius: var(--qc-radius-md) var(--qc-radius-md) 0 0;
  background: var(--qc-surface-soft);
}

.feature-card__media img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--qc-transition);
}

.feature-card--media:hover .feature-card__media img {
  transform: scale(1.02);
}

.feature-card--media .feature-card__body {
  padding: var(--qc-spacing-md);
}

.feature-card__body h3 { margin-bottom: 8px; }
.card-link { color: var(--qc-text); text-decoration: none; }
.card-link:hover { color: var(--qc-blue); }

/* ===== Scenario Cards ===== */
.scenario-card {
  position: relative;
  display: block;
  min-height: 100%;
  padding: clamp(20px, 3vw, 28px);
  text-decoration: none;
  transition: border-color var(--qc-transition), box-shadow var(--qc-transition), transform var(--qc-transition);
}
.scenario-card:hover { border-color: var(--qc-line-strong); box-shadow: var(--qc-shadow-hover); transform: translateY(-2px); color: inherit; }
.scenario-card h3 { margin-top: 16px; }
.scenario-card__icon { color: var(--qc-blue); display: inline-flex; align-items: center; }
.scenario-card__icon svg { width: 20px; height: 20px; }
.scenario-card__arrow { position: absolute; top: 20px; right: 20px; color: var(--qc-text-subtle); display: inline-flex; align-items: center; }
.scenario-card__arrow svg { width: 16px; height: 16px; }

/* ===== Platform Cards ===== */
.platform-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.platform-card {
  min-height: 200px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow);
}
.platform-card h3 { margin-bottom: 10px; }
.platform-card .button { margin-top: 16px; }
.download-section { padding: clamp(48px, 7vw, 80px) 0 0; }

/* ===== CTA & Buttons ===== */
.cta, .cta-section, .download-cta { color: var(--qc-text); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.cta-section {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  padding-inline: clamp(20px, 5vw, 64px);
  background: var(--qc-surface-soft);
}
:root[data-theme="dark"] .cta-section { background: var(--qc-surface); }

.download-cta, .cta a, .cta button, .button, button.primary {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: var(--qc-text);
  color: var(--qc-bg);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--qc-transition), transform var(--qc-transition);
}
.download-cta:hover, .cta a:hover, .cta button:hover, .button:hover, button.primary:hover {
  background: #242933;
  color: var(--qc-bg);
  transform: translateY(-1px);
}
:root[data-theme="dark"] .download-cta,
:root[data-theme="dark"] .cta a,
:root[data-theme="dark"] .cta button,
:root[data-theme="dark"] .button,
:root[data-theme="dark"] button.primary {
  background: var(--qc-blue);
  color: #ffffff;
}
:root[data-theme="dark"] .download-cta:hover,
:root[data-theme="dark"] .cta a:hover,
:root[data-theme="dark"] .cta button:hover,
:root[data-theme="dark"] .button:hover,
:root[data-theme="dark"] button.primary:hover {
  background: var(--qc-blue-bright);
}

.button--secondary {
  border: 1px solid var(--qc-line);
  background: var(--qc-surface);
  color: var(--qc-text);
}
.button--secondary:hover {
  background: var(--qc-surface-soft);
  border-color: var(--qc-line-strong);
}

.download-cta.is-disabled, button:disabled {
  border: 1px solid var(--qc-line);
  background: var(--qc-surface-soft);
  color: var(--qc-text-subtle);
  cursor: not-allowed;
}

.launch-status {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 36px;
  padding: 6px 14px;
  border: 1px solid var(--qc-line);
  border-radius: 999px;
  background: #f1edff;
  color: var(--qc-blue);
  font-size: 0.85rem;
  font-weight: 600;
}
:root[data-theme="dark"] .launch-status {
  background: rgba(113, 79, 252, 0.12);
  border-color: rgba(113, 79, 252, 0.25);
  color: var(--qc-blue-bright);
}

/* ===== FAQ ===== */
.faq__items { display: grid; gap: 8px; }
.faq details {
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow);
  overflow: hidden;
}
.faq summary {
  min-height: 56px;
  display: flex;
  align-items: center;
  padding: 16px 20px;
  color: var(--qc-text);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--qc-transition);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ''; margin-left: auto; width: 18px; height: 18px; background: currentColor; mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='12' y1='5' x2='12' y2='19'/%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3C/svg%3E") center/contain no-repeat; -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='12' y1='5' x2='12' y2='19'/%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3C/svg%3E") center/contain no-repeat; color: var(--qc-text-subtle); flex-shrink: 0; }
.faq details[open] summary::after { mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3C/svg%3E") center/contain no-repeat; -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3C/svg%3E") center/contain no-repeat; }
.faq summary:hover { background: var(--qc-surface-soft); }
.faq details p { padding: 0 20px 20px; margin: 0; color: var(--qc-text-muted); }

/* ===== Feature Strip & Genius Section ===== */
.feature-strip, .genius-section {
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  background: var(--qc-surface-soft);
  padding: clamp(28px, 4vw, 48px);
}
:root[data-theme="dark"] .feature-strip,
:root[data-theme="dark"] .genius-section {
  background: var(--qc-surface);
}

.genius-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}
.genius-section__copy h2 { margin-bottom: 16px; }
.genius-section__media {
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow);
  overflow: hidden;
  max-width: 280px;
  transition: box-shadow var(--qc-transition), transform var(--qc-transition);
}
.genius-section__media:hover {
  box-shadow: var(--qc-shadow-hover);
  transform: translateY(-2px);
}
.genius-section__media img,
.genius-section__media picture {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== Lists ===== */
.check-list, .steps-list { margin: 0; padding: 0; list-style: none; }
.check-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 24px; }
.check-list li { position: relative; padding-left: 26px; color: var(--qc-text); }
.check-list li::before { position: absolute; left: 0; color: var(--qc-blue); content: "✓"; font-weight: 700; }
.steps-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; counter-reset: steps; }
.steps-list li {
  display: grid;
  gap: 8px;
  padding: 22px;
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow);
}
.steps-list li::before { color: var(--qc-blue); content: "0" counter(steps); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; }
.steps-list strong { color: var(--qc-text); font-size: 1.15rem; }
.steps-list span { color: var(--qc-text-muted); }

.legal-note { padding: 28px 0 0; text-align: center; font-size: 0.88rem; }
.text-link { color: var(--qc-blue); }
.text-link:hover { color: var(--qc-blue-bright); }

/* ===== Detail Pages ===== */
.detail-section { padding: clamp(40px, 6vw, 72px) 0 0; }
.detail-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: clamp(24px, 5vw, 64px); align-items: start; }
.detail-grid > div > p:last-child { margin-bottom: 0; }
.example-note { margin-top: 20px; padding: 16px 18px; border-left: 3px solid var(--qc-blue); background: #f1edff; border-radius: 0 var(--qc-radius-sm) var(--qc-radius-sm) 0; }
:root[data-theme="dark"] .example-note { background: rgba(113, 79, 252, 0.08); }

.steps-list--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.check-list--single { grid-template-columns: 1fr; }
.related-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.related-links .button { box-shadow: none; }
.cta .button + .button,
.cta-section .button + .button,
.related-links .button + .button { margin-left: 0; }

.status-pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 36px;
  padding: 6px 14px;
  border: 1px solid var(--qc-line);
  border-radius: 999px;
  background: #fff5eb;
  color: #8a5a00;
  font-size: 0.85rem;
  font-weight: 600;
}
:root[data-theme="dark"] .status-pill {
  background: rgba(255, 165, 0, 0.08);
  border-color: rgba(255, 165, 0, 0.2);
  color: #ffb347;
}

.pricing-status { display: grid; gap: 10px; }
.pricing-status p { margin: 0; }
.pricing-status strong { color: var(--qc-text); }

.feature-detail-hero .hero__visual, .use-case-detail-hero .hero__visual { width: min(100%, 480px); }
.feature-detail-hero .media-frame, .use-case-detail-hero .media-frame { background: var(--qc-surface); }
.feature-detail-hero .media-frame img, .use-case-detail-hero .media-frame img { max-height: 460px; object-fit: contain; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--qc-line);
  background: transparent;
  padding: 48px var(--qc-gutter);
  color: var(--qc-text-subtle);
}
.site-footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  width: min(var(--qc-content), calc(100% - 2 * var(--qc-gutter)));
  margin: 0 auto;
}
.site-footer__brand { display: flex; align-items: center; gap: 12px; }
.site-footer__brand a { color: var(--qc-text); font-weight: 700; text-decoration: none; font-size: 1.1rem; }
.site-footer__brand span { color: var(--qc-text-subtle); font-size: 0.9rem; }
.site-footer__nav { display: flex; gap: 24px; }
.site-footer__nav a { color: var(--qc-text-muted); font-size: 0.9rem; text-decoration: none; transition: color var(--qc-transition); }
.site-footer__nav a:hover { color: var(--qc-blue); }
.site-footer__bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--qc-line); font-size: 0.85rem; color: var(--qc-text-subtle); }

/* ===== Hero Layout ===== */
.hero-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}
.hero__visual, .hero__visual--compact {
  justify-self: end;
  width: min(100%, 380px);
}
.hero__visual--compact { width: min(100%, 280px); }


/* ===== Store Buttons ===== */
.store-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}
.store-btn-wrap {
  position: relative;
  display: inline-block;
}
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 8px 18px;
  border: 1px solid var(--qc-line);
  border-radius: 10px;
  background: var(--qc-text);
  color: var(--qc-bg);
  cursor: pointer;
  font: inherit;
  transition: background-color var(--qc-transition), border-color var(--qc-transition), transform var(--qc-transition);
}
:root[data-theme="dark"] .store-btn {
  background: var(--qc-surface-strong);
  color: var(--qc-text);
  border-color: var(--qc-line-strong);
}
.store-btn:hover {
  transform: translateY(-1px);
  border-color: var(--qc-line-strong);
}
.store-btn__icon {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.store-btn__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}
.store-btn__text small {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.7;
  letter-spacing: 0.02em;
}
.store-btn__text strong {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* QR Code Popup */
.store-qr {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) scale(0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 280px;
  box-sizing: border-box;
  padding: 20px;
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  background: var(--qc-surface);
  box-shadow: var(--qc-shadow-hover);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
  z-index: 30;
}
.store-qr::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--qc-surface);
}
.store-qr img {
  width: 200px;
  height: 200px;
  border-radius: 6px;
  background: #ffffff;
  padding: 6px;
}
.store-qr__label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--qc-text-muted);
}
.store-btn-wrap:hover .store-qr,
.store-btn-wrap:focus-within .store-qr {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) scale(1);
}

@media (max-width: 768px) {
  .store-qr {
    left: 0;
    width: min(280px, calc(100vw - 48px));
    transform: translateX(0) scale(0.92);
  }
  .store-btn-wrap:hover .store-qr,
  .store-btn-wrap:focus-within .store-qr {
    transform: translateX(0) scale(1);
  }
  .store-qr::after {
    left: 28px;
  }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .feature-grid--four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .scenario-grid--five { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .genius-section { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root, :root[data-theme="light"], :root:not([data-theme]) {
    --qc-header-height: 62px;
  }
  .site-header { padding: 0 20px; gap: 12px; }
  .site-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .site-mobile-nav[hidden] { display: none; }
  .site-mobile-nav {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: var(--qc-header-height) 0 0 0;
    z-index: 19;
    padding: 20px;
    background: var(--qc-bg);
    border-top: 1px solid var(--qc-line);
    overflow-y: auto;
  }
  .site-mobile-nav a {
    min-height: 48px;
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 8px;
  }

  .hero-section { grid-template-columns: 1fr; }
  .hero__visual, .hero__visual--compact { justify-self: stretch; width: min(100%, 360px); margin: 0 auto; }
  .feature-grid--four, .scenario-grid--five, .platform-grid, .steps-list, .steps-list--three, .check-list { grid-template-columns: 1fr; }
  .feature-strip { grid-template-columns: 1fr; }
  .detail-grid { grid-template-columns: 1fr; }
  .related-links { align-items: stretch; flex-direction: column; }
  .related-links .button { width: 100%; }
  .site-footer__inner { flex-direction: column; }
  .site-footer__nav { flex-wrap: wrap; gap: 16px; }
}

@media (max-width: 480px) {
  h1 { font-size: clamp(2rem, 8vw, 2.8rem); }
  .feature-grid, .features-grid, .scenario-grid, .pricing-grid { grid-template-columns: 1fr; }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .scenario-card:hover, .feature-card:hover, .pricing-value:hover, .platform-card:hover,
  .download-cta:hover, .button:hover { transform: none; }
}

/* ===== Homepage refinements ===== */
.hero--home {
  padding-inline: clamp(24px, 6vw, 88px);
}

/* Keep the media and copy in one clean surface instead of a card inside a card. */
.feature-card--media {
  padding: 0;
  overflow: hidden;
}
.feature-card--media .feature-card__media {
  border: 0;
  border-radius: 0;
}
.feature-card--media .feature-card__body {
  padding: clamp(18px, 2.2vw, 26px);
}

@media (max-width: 768px) {
  .hero--home {
    padding-inline: 24px;
  }
}