:root {
  /* Fresh teal, light theme */
  --bg: #f5f7fa;            /* page background */
  --card: #ffffff;          /* cards/surfaces */
  --surface: #f9fafb;       /* light tiles */
  --text: #1f2937;          /* primary text */
  --muted: #6b7280;         /* secondary text */
  --accent: #0f8a89;        /* teal */
  --accent-strong: #0c6f6e; /* darker teal */
  --accent-2: #0ea5a6;      /* bright teal */
  --ok: #16a34a;
  --warn: #f59e0b;
  --danger: #ef4444;
  --border: #e5e7eb;        /* light border */
  --border-soft: #eef0f3;
  --chip: #edf7f7;          /* subtle teal chip */
  /* Softer, deeper shadow biased downward to prevent bottom cutoff */
  /* Balanced box-shadow that renders evenly on all sides in light mode */
  --shadow: 0 8px 24px rgba(15, 31, 46, 0.08), 0 2px 6px rgba(15, 31, 46, 0.04);
  --radius: 14px;
  --gutter: clamp(24px, 7vw, 56px); /* responsive horizontal padding */
  --hover: #f3f4f6;         /* button hover */
  --code-bg: #0f2f31;
  --code-fg: #e6f6f7;
  --code-border: rgba(14,165,166,0.25);
  --row-odd: #f9fafb;      /* zebra row for tables (light) */
}

/* Dark theme overrides */
html[data-theme="dark"] {
  --bg: #0b1116;
  --card: #121a22;
  --surface: #0f171e;
  --text: #e6eef3;
  --muted: #9aa6b2;
  --accent: #0a8c8a;
  --accent-strong: #0f6f6e;
  --accent-2: #22d3d6;
  --border: #1a2630;
  --border-soft: #14202b;
  --chip: #0e1f22;
  --shadow: 0 10px 28px rgba(0,0,0,0.45);
  --hover: #16212a;
  --code-bg: #0b2a2c;
  --code-fg: #d5f7f8;
  --code-border: rgba(34,211,238,0.25);
  --row-odd: #0f171e;      /* zebra row for tables (dark) */
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
html { height: 100%; }
body {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
}

header { position: relative; }
.wrap { width: 100%; max-width: 1100px; margin: 0 auto; padding-left: max(var(--gutter), env(safe-area-inset-left)); padding-right: max(var(--gutter), env(safe-area-inset-right)); }
/* Top navigation (mobile-first) */
.topbar { background: var(--card); border-bottom: 1px solid var(--border); box-shadow: none; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; padding-block: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.logo { width: 40px; height: 40px; border-radius: 10px; background: linear-gradient(135deg, var(--accent), var(--accent-strong)); display: grid; place-items: center; color: #fff; font-weight: 800; letter-spacing: -0.02em; }
.brand-name { font-weight: 800; letter-spacing: -0.02em; font-size: 18px; }
.menu-btn { appearance: none; border: 1px solid var(--border); background: var(--card); color: var(--text); padding: 8px 10px; border-radius: 10px; cursor: pointer; font-weight: 600; }
.menu-btn:hover { background: var(--hover); }
.nav { display: none; align-items: center; gap: 10px; }
.nav .btn { padding: 8px 12px; }
.nav .btn.ghost { background: var(--card); border: 1px solid var(--border); color: var(--text); }
.nav .btn.ghost:hover { background: var(--hover); }
.nav-panel { display: none; background: var(--card); border-bottom: 1px solid var(--border); }
.nav-panel.open { display: block; }
.nav-panel-inner { display: grid; gap: 8px; padding-block: 10px; }
.nav-panel .btn { width: 100%; text-align: left; }
@media (min-width: 900px) {
  .menu-btn { display: none; }
  .nav { display: flex; }
  .nav-panel { display: none !important; }
}
/* Hero band */
.hero-band { background: linear-gradient(180deg, var(--accent), var(--accent-strong)); color: #fff; }
.hero { display: grid; grid-template-columns: 1fr; gap: 8px; padding-block: 24px; }
.hero h1 { margin: 0; font-size: clamp(20px, 6vw, 30px); letter-spacing: -0.02em; }
.hero p { margin: 2px 0 0; opacity: 0.95; font-size: 14px; }
@media (max-width: 560px) { .hero { text-align: center; } }

.ad-row { margin: 18px 0 10px; display: flex; justify-content: center; }
.ad-slot {
  width: min(100%, 970px); height: 90px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: var(--card);
  display: grid; place-items: center; color: var(--muted);
  font-size: 14px;
}
@media (max-width: 560px) { .ad-slot { height: 60px; } }

/* Extra bottom padding so bottom-most card shadows have room to render */
main { padding: 24px 0 140px; flex: 1 0 auto; }
.grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}
.grid > * { min-width: 0; }
@media (max-width: 980px) { .grid { grid-template-columns: 1fr; } }
/* Prevent accidental horizontal expansion in key containers */
.wrap, .card, .results, .advanced, header, footer { max-width: 100%; overflow-x: hidden; }

/* Avoid cards creating horizontal scroll on mobile when inner content is wide */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: none; background-clip: padding-box; isolation: isolate; overflow: hidden; }

.drop { padding: 18px; display: grid; gap: 16px; width: 100%; max-width: 100%; }
.dropzone { position: relative; border: 2px dashed var(--border); border-radius: 12px; padding: 26px; text-align: center; transition: 0.15s border-color, 0.15s background; background: var(--surface); max-width: 100%; overflow: hidden; }
.dropzone.dragover { border-color: var(--accent-2); background: #e6fbfb; }
.dropzone input[type=file] { display: none; }
.drop-inner { display: grid; gap: 8px; place-items: center; max-width: 100%; overflow-x: hidden; }
.drop-title { font-size: 18px; font-weight: 650; }
.drop-hint { color: var(--muted); font-size: 14px; }
.buttons { display: flex; gap: 10px; justify-content: center; margin-top: 8px; flex-wrap: wrap; }
@media (max-width: 480px) { .buttons { flex-direction: column; } .buttons .btn { width: 100%; } }
.btn {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 10px 14px; border-radius: 10px; cursor: pointer; font-weight: 600;
  transition: transform 0.05s ease, background 0.15s ease, border-color 0.15s ease;
  text-decoration: none; display: inline-flex; align-items: center; gap: 8px; vertical-align: middle; line-height: 1;
}
a.btn:link, a.btn:visited, a.btn:hover, a.btn:active { text-decoration: none; }
.btn:hover { background: var(--hover); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  border: none; /* avoid 1px seam artifacts */
  color: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.25), 0 6px 16px rgba(14,165,166,0.25);
  background-clip: padding-box; /* clip gradient to padding box */
}
.btn.primary:hover {
  background: linear-gradient(180deg, var(--accent-2), var(--accent-strong));
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.25), 0 8px 18px rgba(14,165,166,0.35);
}
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.file-chip { display: inline-flex; align-items: center; gap: 8px; background: var(--chip); border: 1px solid var(--border); padding: 6px 10px; border-radius: 999px; font-size: 13px; color: var(--muted); max-width: 100%; min-width: 0; flex: 1 1 auto; overflow: hidden; }
.file-chip strong { color: var(--text); font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; flex: 1 1 auto; }
.file-chip .badge, .file-chip span { white-space: nowrap; flex: 0 0 auto; }

.preview { display: none; padding: 0 6px; margin-top: 8px; max-width: 100%; overflow-x: hidden; }
.preview-inner { display: flex; align-items: center; gap: 12px; min-width: 0; max-width: 100%; }
.preview img { width: 64px; height: 64px; object-fit: cover; border-radius: 10px; border: 1px solid var(--border); }
img, svg, video, canvas { max-width: 100%; height: auto; }

/* Guard the results area from affecting page width and jumping */
.results { padding: 16px; display: none; width: 100%; max-width: 100%; overflow-x: hidden; }
.results h2 { margin: 0 0 12px; font-size: 18px; }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
@media (max-width: 560px) { .stats { grid-template-columns: 1fr; } }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; box-shadow: inset 0 1px 0 rgba(255,255,255,0.6); min-width: 0; overflow: hidden; max-width: 100%; }
.stat label { display: block; color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.stat .value { font-weight: 700; letter-spacing: -0.01em; overflow-wrap: anywhere; word-break: break-word; }
.meta-table { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 12px; }
.meta-table .row { display: grid; grid-template-columns: 200px 1fr; gap: 12px; padding: 12px 10px; border-bottom: 1px dashed var(--border); min-width: 0; }
.meta-table .row:nth-child(odd) { background: var(--row-odd); }
.meta-table .row:last-child { border-bottom: 0; }
.meta-table .k { color: var(--muted); }
.meta-table .row > div:last-child { overflow-wrap: anywhere; color: var(--text); font-weight: 500; }
@media (max-width: 700px) { .meta-table .row { grid-template-columns: 1fr; } }

.advanced { margin-top: 14px; }
.advanced summary { cursor: pointer; color: var(--accent-2); font-weight: 700; }
.advanced[open] { overflow: hidden; }
pre.json {
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--code-border);
  border-radius: 10px;
  padding: 16px;
  max-height: 360px;
  /* Ensure long JSON lines never expand the layout; scroll inside only */
  overflow: auto; /* internal scrolling for long lines */
  font-size: 12px;
  line-height: 1.45;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  width: 100%;
  max-width: 100%;
  box-shadow: none;
  contain: paint; /* isolate paint to avoid artifacting */
  word-wrap: normal;
  white-space: pre; /* do not wrap JSON, keep in scroller */
}

/* Progress bar (used by converters) */
.progress-wrap { display: grid; gap: 8px; }
.progress { position: relative; height: 10px; background: var(--border-soft); border: 1px solid var(--border); border-radius: 999px; overflow: hidden; }
.progress .bar { position: absolute; left: 0; top: 0; bottom: 0; width: 0%; background: linear-gradient(180deg, var(--accent-2), var(--accent)); transition: width 0.25s ease; }
.progress-text { color: var(--muted); font-size: 13px; }

/* Tighter safeguards for very small screens */
@media (max-width: 560px) {
  /* Prevent any container from exceeding the viewport width */
  .wrap, .drop, .results, .meta-table, .advanced { max-width: 100%; overflow-x: hidden; }
}

.side { display: grid; gap: 16px; }
.sticky { position: sticky; top: 16px; }
@media (max-width: 980px) { .sticky { position: static; } }
.side .card { padding: 16px; }
.side h3 { margin: 0 0 8px; font-size: 16px; }
.list { color: var(--muted); font-size: 14px; }
.list li { margin: 6px 0; }
.ad-rect { height: 280px; display: grid; place-items: center; }
@media (max-width: 980px) { .ad-rect { display: grid; height: 250px; margin-top: 12px; } }

.note { color: var(--muted); font-size: 13px; }

/* Platform‑conditional picker visibility: set via theme-init.js to avoid flicker */
html[data-ua="desktop"] #browse-alt-btn { display: none !important; }
html[data-ua="mobile"] #browse-btn { display: none !important; }

.badge { font-size: 11px; padding: 4px 8px; border-radius: 999px; border: 1px solid var(--border); background: #eef6f6; color: var(--muted); }
.link { color: var(--accent); text-decoration: none; border-bottom: 1px dashed rgba(14,165,166,0.45); }
.link:hover { text-decoration: none; border-bottom-style: solid; }
.btn:focus-visible, .dropzone:focus-visible, a.link:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }

/* Toggle switch */
.switch { --w: 50px; --h: 26px; --p: 3px; position: relative; display: inline-block; width: var(--w); height: var(--h); vertical-align: middle; cursor: pointer; }
.switch input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.switch .track { position: absolute; inset: 0; background: var(--card); border-radius: 999px; transition: background 0.2s ease; box-shadow: inset 0 0 0 1px var(--border); background-clip: padding-box; }
.switch .thumb { position: absolute; top: var(--p); left: var(--p); width: calc(var(--h) - var(--p)*2); height: calc(var(--h) - var(--p)*2); border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.25); transition: transform 0.2s ease, background 0.2s ease; }
.switch .icon { position: absolute; top: 50%; transform: translateY(-50%); font-size: 12px; opacity: 0.75; }
.switch .sun { left: 7px; }
.switch .moon { right: 7px; }
.switch input:focus-visible + .track { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.switch input:checked + .track { background: linear-gradient(180deg, var(--accent-2), var(--accent)); box-shadow: inset 0 0 0 1px rgba(0,0,0,0.25); }
.switch input:checked + .track .thumb { transform: translateX(calc(var(--w) - var(--h))); }
/* Footer */
footer { margin-top: 40px; background: var(--card); border-top: 1px solid var(--border); flex-shrink: 0; }

/* Banners */
.banner { position: relative; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border); margin: 12px 0; font-weight: 600; }
.banner .small { display: block; font-weight: 400; font-size: 13px; opacity: 0.9; margin-top: 4px; }
.banner.warn { background: linear-gradient(180deg, rgba(245,158,11,0.22), rgba(245,158,11,0.12)); border-color: rgba(245,158,11,0.5); color: var(--text); }
html[data-theme="dark"] .banner.warn { background: linear-gradient(180deg, rgba(245,158,11,0.25), rgba(245,158,11,0.15)); border-color: rgba(245,158,11,0.55); }

.banner .close { position: absolute; top: 8px; right: 8px; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 8px; border: 1px solid var(--border); background: var(--card); color: var(--text); cursor: pointer; font-size: 16px; line-height: 1; padding: 0; }
.banner .close:hover { background: var(--hover); }
.banner .close:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.footer-top { padding-block: 26px; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-col h4 { margin: 0 0 10px; color: var(--accent-strong); font-size: 14px; letter-spacing: 0.02em; }
.footer-col a { display: block; color: var(--text); text-decoration: none; padding: 6px 0; font-size: 14px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-block: 12px; color: var(--muted); font-size: 13px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
@media (max-width: 560px) { .footer-col { text-align: center; } .footer-bottom { flex-direction: column; justify-content: center; text-align: center; } }
.copyright { color: var(--muted); }

.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2px solid rgba(255,255,255,0.25); border-top-color: #fff; animation: spin 0.8s linear infinite; display: inline-block; vertical-align: -3px; }
@keyframes spin { to { transform: rotate(360deg); } }
.btn:focus-visible, .dropzone:focus-visible, a.link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Tools grid (homepage) */
.tools-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 16px; }
@media (max-width: 980px) { .tools-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .tools-grid { grid-template-columns: 1fr; } }
.tool-card { display: grid; gap: 10px; padding: 16px; align-content: start; }
.tool-card h3 { margin: 0; font-size: 18px; }
.tool-card p { margin: 0; color: var(--muted); font-size: 14px; }
.tool-meta { display: flex; gap: 8px; align-items: center; color: var(--muted); font-size: 12px; }
.tool-actions { margin-top: 8px; }