:root {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    font-size: 16px;
    line-height: 24px;
    font-weight: 400;
    color-scheme: light dark;
    /* Desktop defaults (mobile overrides below) */
    --bg: #ffffff;
    --fg: #213547;
    font-synthesis: none;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* Mobile bottom tabs layout (works on all themes) */
.mobile-pane {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 520px;
  height: 70vh; /* fixed-height main screen */
  border-radius: 12px;
}
.mobile-pane .p-mobile-tabs-content {
  position: relative;
  flex: 1 1 auto;
  overflow: hidden; /* contain panels */
  display: flex;
  flex-direction: column;
}
.p-mobile-tabs-content .p-mobile-tabs--content {
  display: none;
  overflow: auto; /* scroll inside content area */
  -webkit-overflow-scrolling: touch;
  padding: 8px 8px 16px;
}
.p-mobile-tabs-content .p-mobile-tabs--content.active { display: block; }

*, *::before, *::after {
    box-sizing: border-box;
}

/* Prefer system fonts on mobile; remove custom font to reduce bundle size */

h3 {
    font-size: 3em;
    line-height: 1.1;
}

a {
    font-weight: 500;
    color: #646cff;
    text-decoration: inherit;
}

a:hover {
    color: #535bf2;
}

/* Remove generic button styling to allow Puppertino .btn to control buttons */

.result {
    height: 20px;
    line-height: 20px;
}

html,
body {
    height: 100%;
    width: 100%;
    overflow-x: hidden; /* prevent horizontal overflow */
    overflow-y: auto;   /* allow vertical scroll if needed */
}

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 320px;
    /* Use small viewport units to avoid iOS Safari URL bar issues */
    min-height: 100svh;
    height: auto; /* avoid forcing overflow */
    /* Equal responsive spacing top & bottom */
    padding-block: clamp(8px, 4vh, 48px);
    color: var(--fg);
    background-color: var(--bg);
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* Responsive spacing between elements */
    gap: clamp(8px, 2vh, 24px);
    width: 100%;
    max-width: 480px;
    padding-inline: 16px;
}

h1 {
    /* Responsive heading size */
    font-size: clamp(1.6rem, 6vw, 3.2rem);
    line-height: 1.1;
}

#app {
    max-width: 1280px;
    margin: 0 auto;
    /* Responsive inner padding: horizontal only, no extra top/bottom */
    padding: 0 clamp(12px, 4vw, 32px);
    text-align: center;
}

.logo {
    /* Consistent visual size across images: fix height, auto width */
    height: clamp(80px, 18vh, 140px);
    width: auto;
    max-width: 80vw;
    padding: 0.5em;
    will-change: filter;
}

.logo:hover {
    filter: drop-shadow(0 0 2em #e80000aa);
}

.logo.vanilla:hover {
    filter: drop-shadow(0 0 2em #f7df1eaa);
}

.result {
    height: 20px;
    line-height: 20px;
    margin: 1.5rem auto;
    text-align: center;
}

.footer {
    margin-top: 1rem;
    align-content: center;
    text-align: center;
}

/* Tabs: default hide panels, show one matching the checked radio */
.tabs .tabs-content .tab-panel { display: none; }
.tabs input#tab-js:checked ~ .tabs-content [data-tab="tab-js"] { display: block; }
.tabs input#tab-go:checked ~ .tabs-content [data-tab="tab-go"] { display: block; }

/* Sticky tabs header */
.tabs .tabs-header {
    position: sticky;
    top: env(safe-area-inset-top);
    z-index: 5;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 8px 0;
    background: var(--bg);
    backdrop-filter: saturate(1.2) blur(4px);
}

/* Subtle divider under sticky header */
.tabs .tabs-header::after {
    content: "";
    grid-column: 1 / -1;
    height: 1px;
    background: rgba(0,0,0,0.08);
    margin-top: 8px;
}

/* Mobile-specific light mode */
@media (max-width: 768px) and (prefers-color-scheme: light) {
    :root {
        --fg: #213547;
        --bg: #ffffff;
    }

    a:hover {
        color: #747bff;
    }

    /* allow Puppertino to style .btn */

    .input-box .input {
        color: #111827;
        background-color: #f3f4f6;
        border: 1px solid #e5e7eb; /* show border in light mode */
        border-radius: 8px;
    }

    button:hover {
        border-color: #d1d5db; /* slate-300 */
    }

    .input-box .input:focus {
        border-color: #9ca3af; /* gray-400 */
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15); /* subtle focus ring */
    }
}

/* let Puppertino handle .btn hover */

.input-box .input {
    border: 1px solid transparent; /* default; themed in media queries */
    border-radius: 8px;
    outline: none;
    height: 30px;
    line-height: 30px;
    padding: 0 10px;
    color: black;
    background-color: rgba(240, 240, 240, 1);
    -webkit-font-smoothing: antialiased;
}

.input-box .input:hover {
    background-color: rgba(255, 255, 255, 1);
}

.input-box .input:focus {
    background-color: rgba(255, 255, 255, 1);
    outline: 2px solid transparent;
    outline-offset: 2px;
}

/* Mobile-specific dark mode */
@media (max-width: 768px) and (prefers-color-scheme: dark) {
    :root {
        color: rgba(255, 255, 255, 0.88);
        --fg: rgba(255, 255, 255, 0.88);
        --bg: #0f1115; /* deep dark background */
    }

    a {
        color: #8ea2ff;
    }

    a:hover {
        color: #aab6ff;
    }

    /* allow Puppertino to style .btn in dark mode */

    .input-box .input {
        background-color: #111827; /* gray-900 */
        color: #e5e7eb;
        caret-color: #ffffff;
        border: 1px solid #374151; /* slate-700 */
    }

    .input-box .input:hover,
    .input-box .input:focus {
        background-color: #0b1220;
        border-color: #4b5563; /* slate-600 */
    }

    /* allow Puppertino to handle active state */
}

/* Mobile baseline overrides (apply to both light and dark) */
@media (max-width: 768px) {
  /* Prevent iOS zoom on focus */
  input, textarea, select, button { font-size: 16px; }

  /* Make layout vertical and scrollable */
  html, body {
    height: auto;
    min-height: 100svh;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    position: static;
  }

  .container {
    width: 100%;
    max-width: 520px; /* allow a bit wider on phones */
    align-items: center; /* keep content centered on mobile */
    text-align: center;
  }

  /* Stack controls vertically with full-width tap targets */
  .input-box {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .input-box .input,
  .input,
  button,
  .p-btn {
    width: 100%;
    min-height: 44px; /* comfortable touch target */
  }

  /* Tabs vertical and full-width */
  .tabs {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .tabs .p-btn { width: 100%; }

  /* Cap device info height for readability */
  #deviceInfo {
    max-height: 30vh;
    overflow: auto;
    padding: 8px;
    border-radius: 8px;
    background: rgba(0,0,0,0.04);
  }
}