/* ============================================================
   SideShelf Marketing Site
   Colors mirror the app's theme.ts (dark defaults)
   ============================================================ */

:root {
  color-scheme: dark; /* tells browser (scrollbars, inputs) to use dark theme */

  /* Backgrounds (matching app: #222 card, #1C1C1E tab bar) */
  --clr-bg:        #0f0f0f;
  --clr-bg-2:      #1a1a1a;
  --clr-bg-3:      #222222;

  /* Accent (derived from app's dark link color #9CDCFE, shifted warmer) */
  --clr-accent:       #4a9ee8;
  --clr-accent-hover: #2e80cc;

  /* Text (matching app's textPrimary/textSecondary) */
  --clr-text:   #ffffff;
  --clr-text-2: #aaaaaa;
  --clr-text-3: #555555;

  /* Borders (matching app's separator rgba(255,255,255,0.15)) */
  --clr-border:   rgba(255, 255, 255, 0.08);
  --clr-border-2: rgba(255, 255, 255, 0.18);

  /* Layout */
  --max-width:  1160px;
  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  28px;

  /* Spacing scale */
  --sp-xs: 0.5rem;
  --sp-sm: 1rem;
  --sp-md: 2rem;
  --sp-lg: 4rem;
  --sp-xl: 8rem;

  /* System font stack — no external requests */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img { max-width: 100%; display: block; }
a { color: var(--clr-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Base ---- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--clr-border);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-md);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text);
  text-decoration: none;
}

.nav__logo-icon { font-size: 1.4rem; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.nav__links a {
  color: var(--clr-text-2);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

.nav__links a:hover { color: var(--clr-text); text-decoration: none; }
.nav__cta { color: var(--clr-accent) !important; }

/* ---- Theme toggle button ---- */
.theme-toggle {
  background: none;
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-sm);
  color: var(--clr-text-2);
  cursor: pointer;
  font-size: 1rem;
  padding: 5px 9px;
  line-height: 1;
  transition: border-color 0.2s, color 0.2s;
}
.theme-toggle:hover {
  color: var(--clr-text);
  border-color: var(--clr-border-2);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s, border-color 0.2s;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--clr-accent);
  color: #fff;
  border-color: var(--clr-accent);
}
.btn--primary:hover {
  background: var(--clr-accent-hover);
  border-color: var(--clr-accent-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--secondary {
  background: var(--clr-bg-3);
  color: var(--clr-text);
  border-color: var(--clr-border-2);
}
.btn--secondary:hover {
  background: #2a2a2a;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--clr-text-2);
  border-color: var(--clr-border-2);
}
.btn--ghost:hover {
  color: var(--clr-text);
  text-decoration: none;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--sp-xl) var(--sp-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--sp-lg);
  min-height: calc(100vh - 60px);
}

.hero__badge {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(74, 158, 232, 0.12);
  border: 1px solid rgba(74, 158, 232, 0.35);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clr-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--sp-md);
}

.hero__headline {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin-bottom: var(--sp-sm);
}

.hero__description {
  font-size: 1.1rem;
  color: var(--clr-text-2);
  max-width: 460px;
  line-height: 1.75;
  margin-bottom: var(--sp-md);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---- Phone mockup ---- */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  width: 260px;
  background: #1c1c1e;
  border-radius: 48px;
  padding: 14px;
  border: 1.5px solid rgba(255, 255, 255, 0.12);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.6),
    0 40px 80px rgba(0, 0, 0, 0.7),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}


.phone-mockup__screen {
  background: #222;
  border-radius: 32px;
  overflow: hidden;
  aspect-ratio: 9 / 19.5;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Theme-switched images: dark shown by default, light hidden */
.img-theme-dark,
.img-theme-light {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-theme-light { display: none; }

/* Light via OS (no manual override) */
@media (prefers-color-scheme: light) {
  html:not([data-theme]) .img-theme-dark  { display: none; }
  html:not([data-theme]) .img-theme-light { display: block; }
}

/* Manual light */
[data-theme="light"] .img-theme-dark  { display: none; }
[data-theme="light"] .img-theme-light { display: block; }

/* Manual dark (force dark even on light OS) */
[data-theme="dark"] .img-theme-dark  { display: block; }
[data-theme="dark"] .img-theme-light { display: none; }

/* Placeholder sits beneath — visible only when image is absent/404 */
.phone-mockup__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--clr-text-3);
  font-size: 0.75rem;
}

.phone-mockup__placeholder span { font-size: 2.5rem; }

/* ============================================================
   SHARED SECTION LAYOUT
   ============================================================ */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--sp-xl) var(--sp-md);
}

.section-inner--narrow {
  max-width: 600px;
  text-align: center;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--clr-text-2);
  margin-bottom: var(--sp-lg);
}

/* ============================================================
   FEATURES
   ============================================================ */
.features {
  background: var(--clr-bg-2);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-sm);
}

.feature-card {
  background: var(--clr-bg-3);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--sp-md);
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--clr-border-2);
  transform: translateY(-2px);
}

.feature-card__icon { font-size: 1.8rem; margin-bottom: var(--sp-sm); }

.feature-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card__description {
  font-size: 0.875rem;
  color: var(--clr-text-2);
  line-height: 1.65;
}

/* ============================================================
   SCREENSHOTS
   ============================================================ */
.screenshots__grid {
  display: grid;
  grid-template-columns: 1fr 1.35fr 1fr;
  gap: var(--sp-md);
  align-items: center;
}

.screenshot-frame { text-align: center; }

.screenshot-frame__device {
  background: var(--clr-bg-3);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 9 / 19;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  position: relative;
}

.screenshot-frame--featured .screenshot-frame__device {
  border-color: rgba(74, 158, 232, 0.5);
  box-shadow: 0 0 48px rgba(74, 158, 232, 0.12);
}


.screenshot-frame__placeholder {
  color: var(--clr-text-3);
  font-size: 0.8rem;
  font-weight: 500;
}

.screenshot-frame__label {
  font-size: 0.85rem;
  color: var(--clr-text-2);
  font-weight: 500;
}

/* ============================================================
   SELF-HOSTED
   ============================================================ */
.self-hosted {
  background: var(--clr-bg-2);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.self-hosted__icon { font-size: 2.8rem; margin-bottom: var(--sp-sm); }

.self-hosted__text {
  font-size: 1.05rem;
  color: var(--clr-text-2);
  line-height: 1.8;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: var(--sp-lg) var(--sp-md) var(--sp-md);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto 2rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-md);
}

.footer__brand { display: flex; flex-direction: column; gap: 6px; }

.footer__brand-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
}

.footer__tagline {
  font-size: 0.8rem;
  color: var(--clr-text-3);
}

.footer__links {
  display: flex;
  gap: var(--sp-md);
  align-items: center;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--clr-text-2);
  transition: color 0.2s;
}

.footer__links a:hover { color: var(--clr-text); text-decoration: none; }

.footer__bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: var(--sp-md);
  border-top: 1px solid var(--clr-border);
  font-size: 0.78rem;
  color: var(--clr-text-3);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .features__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: var(--sp-lg);
    text-align: center;
  }

  .hero__description { max-width: 100%; }
  .hero__actions { justify-content: center; }
  .hero__visual { order: -1; }
  .phone-mockup { width: 200px; }

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

  .screenshots__grid {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    gap: 12px;
    padding-left: var(--sp-md);
    padding-right: var(--sp-md);
    max-width: none;
    margin-left: calc(-1 * var(--sp-md));
    margin-right: calc(-1 * var(--sp-md));
  }

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

  .screenshot-frame {
    flex: 0 0 170px;
    scroll-snap-align: center;
  }

  .screenshot-frame--featured {
    flex: 0 0 200px;
  }

  .footer__inner { flex-direction: column; }
  .footer__links { flex-wrap: wrap; gap: var(--sp-sm); }
}

/* ---- Light mode: auto (OS preference) + manual toggle ---- */
/* Auto light: OS preference, no manual override */
@media (prefers-color-scheme: light) {
  html:not([data-theme]) {
    color-scheme: light;
    --clr-bg:           #ffffff;
    --clr-bg-2:         #f5f5f7;
    --clr-bg-3:         #eeeeee;
    --clr-accent:       #0066cc;
    --clr-accent-hover: #0052a3;
    --clr-text:         #000000;
    --clr-text-2:       #555555;
    --clr-text-3:       #aaaaaa;
    --clr-border:       rgba(0, 0, 0, 0.08);
    --clr-border-2:     rgba(0, 0, 0, 0.18);
  }

  html:not([data-theme]) .nav            { background: rgba(255, 255, 255, 0.88); }
  html:not([data-theme]) .phone-mockup   { background: #e0e0e5; border-color: rgba(0, 0, 0, 0.1); }
  html:not([data-theme]) .phone-mockup__screen { background: #f5f5f7; }
}

/* Manual light */
[data-theme="light"] {
  color-scheme: light;
  --clr-bg:           #ffffff;
  --clr-bg-2:         #f5f5f7;
  --clr-bg-3:         #eeeeee;
  --clr-accent:       #0066cc;
  --clr-accent-hover: #0052a3;
  --clr-text:         #000000;
  --clr-text-2:       #555555;
  --clr-text-3:       #aaaaaa;
  --clr-border:       rgba(0, 0, 0, 0.08);
  --clr-border-2:     rgba(0, 0, 0, 0.18);
}
[data-theme="light"] .nav            { background: rgba(255, 255, 255, 0.88); }
[data-theme="light"] .phone-mockup   { background: #e0e0e5; border-color: rgba(0, 0, 0, 0.1); }
[data-theme="light"] .phone-mockup__screen { background: #f5f5f7; }

/* Manual dark (force dark even on a light-preference OS) */
[data-theme="dark"] {
  color-scheme: dark;
  --clr-bg:           #0f0f0f;
  --clr-bg-2:         #1a1a1a;
  --clr-bg-3:         #222222;
  --clr-accent:       #4a9ee8;
  --clr-accent-hover: #2e80cc;
  --clr-text:         #ffffff;
  --clr-text-2:       #aaaaaa;
  --clr-text-3:       #555555;
  --clr-border:       rgba(255, 255, 255, 0.08);
  --clr-border-2:     rgba(255, 255, 255, 0.18);
}
[data-theme="dark"] .nav            { background: rgba(15, 15, 15, 0.85); }
[data-theme="dark"] .phone-mockup   { background: #1c1c1e; border-color: rgba(255, 255, 255, 0.12); }
[data-theme="dark"] .phone-mockup__screen { background: #222; }