/* ==========================================================================
   Museumate Landing Page — Stylesheet
   Mobile-first, responsive, dark mode support, no dependencies.
   ========================================================================== */

/* ---------- Custom Properties ---------- */
:root {
  --color-bg: #fbfbfd;
  --color-bg-alt: #f5f5f7;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #1b2845;
  --color-accent-light: #2d4a7a;
  --color-accent-lighter: #3a5f9a;
  --color-surface: #ffffff;
  --color-border: rgba(0, 0, 0, 0.06);
  --color-shadow: rgba(0, 0, 0, 0.06);
  --color-nav-bg: rgba(251, 251, 253, 0.85);
  --color-hero-gradient-start: #0d1525;
  --color-hero-gradient-end: #1b2845;
  --color-hero-text: #ffffff;
  --color-hero-text-secondary: rgba(255, 255, 255, 0.7);
  --color-card-bg: #ffffff;
  --color-stats-bg: #f5f5f7;
  --color-highlight-border: rgba(27, 40, 69, 0.1);

  --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', sans-serif;

  --max-width: 1200px;
  --max-width-narrow: 800px;
  --spacing-section: clamp(64px, 8vw, 120px);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #000000;
    --color-bg-alt: #0d1117;
    --color-text: #f5f5f7;
    --color-text-secondary: #98989d;
    --color-surface: #1c1c1e;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-nav-bg: rgba(0, 0, 0, 0.85);
    --color-card-bg: #1c1c1e;
    --color-stats-bg: #0d1117;
    --color-highlight-border: rgba(255, 255, 255, 0.08);
    --color-accent-light: #4a7fc7;
    --color-accent-lighter: #6b9fe0;
  }
}


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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-accent-light);
  outline-offset: 3px;
  border-radius: 4px;
}


/* ---------- Typography ---------- */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.section-subtitle {
  font-family: var(--font-body);
  font-size: clamp(16px, 2.5vw, 20px);
  line-height: 1.5;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 560px;
  margin: 16px auto 0;
}


/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}


/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-normal);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 101;
}

.nav__icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 101;
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav__toggle.is-active .nav__toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__toggle.is-active .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle.is-active .nav__toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.nav__links {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.nav__link {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-accent-light);
}

.nav__link--cta {
  color: var(--color-accent-light);
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__links {
    position: static;
    flex-direction: row;
    gap: 32px;
    opacity: 1;
    visibility: visible;
    background: none;
  }

  .nav__link {
    font-size: 14px;
    font-weight: 500;
  }
}


/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--color-hero-gradient-start), var(--color-hero-gradient-end));
  padding: calc(56px + 48px) 24px 0;
  overflow: hidden;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
}

.hero__content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 48px;
  padding-bottom: 0;
}

.hero__text {
  max-width: 600px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding: 6px 16px 6px 6px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.hero__badge-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.hero__badge-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-hero-text-secondary);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-hero-text);
  margin-bottom: 20px;
}

.hero__subtitle {
  font-size: clamp(16px, 2.5vw, 19px);
  line-height: 1.55;
  color: var(--color-hero-text-secondary);
  margin-bottom: 32px;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero__availability {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  letter-spacing: 0.01em;
}

.hero__device {
  flex-shrink: 0;
}

/* App Store badge */
.app-store-badge {
  display: inline-block;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.app-store-badge:hover {
  transform: scale(1.04);
  opacity: 0.9;
}

.app-store-badge:active {
  transform: scale(0.98);
}

@media (prefers-color-scheme: dark) {
  .app-store-badge svg rect {
    fill: #fff;
  }
  .app-store-badge svg g {
    fill: #000;
  }
}

/* Device Frame */
.device-frame {
  position: relative;
  width: 260px;
  background: #000;
  border-radius: 44px;
  padding: 10px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.1),
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 8px 24px rgba(0, 0, 0, 0.2);
}

.device-frame::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 24px;
  background: #000;
  border-radius: 0 0 16px 16px;
  z-index: 2;
}

.device-frame__screen {
  width: 100%;
  height: auto;
  border-radius: 34px;
  display: block;
}

.device-frame--gallery {
  width: 220px;
}

@media (min-width: 768px) {
  .hero {
    padding-top: calc(56px + 80px);
  }

  .hero__content {
    flex-direction: row;
    text-align: left;
    align-items: center;
    gap: 64px;
    padding-bottom: 0;
  }

  .hero__text {
    flex: 1;
  }

  .hero__actions {
    align-items: flex-start;
  }

  .hero__device {
    margin-bottom: -80px;
  }

  .device-frame {
    width: 300px;
  }

  .device-frame--gallery {
    width: 240px;
  }
}

@media (min-width: 1024px) {
  .device-frame {
    width: 340px;
    border-radius: 52px;
    padding: 12px;
  }

  .device-frame::before {
    top: 12px;
    width: 100px;
    height: 28px;
    border-radius: 0 0 18px 18px;
  }

  .device-frame__screen {
    border-radius: 40px;
  }

  .hero__device {
    margin-bottom: -120px;
  }

  .device-frame--gallery {
    width: 260px;
    border-radius: 48px;
    padding: 10px;
  }

  .device-frame--gallery .device-frame__screen {
    border-radius: 38px;
  }

  .device-frame--gallery::before {
    width: 80px;
    height: 24px;
    border-radius: 0 0 14px 14px;
  }
}


/* ---------- Stats ---------- */
.stats {
  padding: 48px 24px;
  background: var(--color-stats-bg);
}

.stats__container {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.stats__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 80px;
}

.stats__number {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

@media (prefers-color-scheme: dark) {
  .stats__number {
    color: var(--color-accent-lighter);
  }
}

.stats__label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stats__divider {
  width: 1px;
  height: 36px;
  background: var(--color-border);
}

@media (min-width: 768px) {
  .stats {
    padding: 56px 24px;
  }

  .stats__container {
    gap: 48px;
  }
}


/* ---------- Features ---------- */
.features {
  padding: var(--spacing-section) 24px;
  background: var(--color-bg);
}

.features__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 48px;
}

.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-shadow);
}

@media (prefers-reduced-motion: reduce) {
  .feature-card:hover {
    transform: none;
  }
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--color-accent);
}

@media (prefers-color-scheme: dark) {
  .feature-card__icon {
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-accent-lighter);
  }
}

.feature-card__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-card__text {
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

@media (min-width: 640px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 64px;
  }
}


/* ---------- Screenshots ---------- */
.screenshots {
  padding: var(--spacing-section) 0;
  background: var(--color-bg-alt);
  overflow: hidden;
}

.screenshots__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.screenshots__gallery {
  margin-top: 48px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 0 24px 24px;
  margin-left: -24px;
  margin-right: -24px;
}

.screenshots__gallery::-webkit-scrollbar {
  display: none;
}

.screenshots__track {
  display: flex;
  gap: 24px;
  padding: 8px 0;
}

.screenshot-item {
  flex-shrink: 0;
  scroll-snap-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.screenshot-item__caption {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
}

@media (min-width: 1200px) {
  .screenshots__gallery {
    overflow: visible;
    padding: 0;
    margin-left: 0;
    margin-right: 0;
  }

  .screenshots__track {
    justify-content: center;
    gap: 32px;
  }

  .screenshot-item {
    scroll-snap-align: none;
  }
}


/* ---------- Highlights ---------- */
.highlights {
  padding: var(--spacing-section) 24px;
  background: var(--color-bg);
}

.highlights__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.highlights__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
}

.highlight {
  padding: 28px 24px;
  border-left: 3px solid var(--color-accent);
  background: var(--color-card-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

@media (prefers-color-scheme: dark) {
  .highlight {
    border-left-color: var(--color-accent-lighter);
  }
}

.highlight__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.highlight__text {
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

@media (min-width: 640px) {
  .highlights__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .highlights__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-top: 64px;
  }
}


/* ---------- CTA ---------- */
.cta {
  padding: var(--spacing-section) 24px;
  background: linear-gradient(160deg, var(--color-hero-gradient-start), var(--color-hero-gradient-end));
}

.cta__container {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.cta__icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  margin-bottom: 8px;
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-hero-text);
}

.cta__text {
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.5;
  color: var(--color-hero-text-secondary);
  margin-bottom: 8px;
}


/* ---------- Footer ---------- */
.footer {
  padding: 40px 24px;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer__icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.footer__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
}

.footer__nav {
  display: flex;
  gap: 32px;
}

.footer__link {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text);
}

.footer__bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.footer__copyright {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.footer__note {
  font-size: 12px;
  color: var(--color-text-secondary);
  opacity: 0.7;
  margin-top: 8px;
}

@media (min-width: 768px) {
  .footer__top {
    flex-direction: row;
    justify-content: space-between;
  }

  .footer__bottom {
    display: flex;
    justify-content: space-between;
    text-align: left;
  }
}


/* ---------- Utility ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}