/* ============================================================
   Senior-Friendly Tools Hub — design system
   - WCAG AAA contrast, 20px+ base font, 60px+ click targets
   ============================================================ */

:root {
  --bg: #FAF8F4;
  --surface: #FFFFFF;
  --surface-2: #F2EEE6;
  --ink: #1F2A37;
  --ink-soft: #4B5563;
  --accent: #1D4ED8;
  --accent-hover: #1E40AF;
  --accent-soft: #DBEAFE;
  --success: #15803D;
  --success-soft: #DCFCE7;
  --warn: #B45309;
  --warn-soft: #FEF3C7;
  --error: #B91C1C;
  --error-soft: #FEE2E2;
  --border: #D1D5DB;
  --border-strong: #9CA3AF;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 6px 18px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, 0.12);
  --radius: 14px;
  --radius-lg: 22px;
  --maxw: 1100px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Layout ---------- */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px 40px;
}

.site-header {
  padding: 12px 24px 0;
  max-width: var(--maxw);
  margin: 0 auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 2px solid transparent;
}
.back-link:hover { background: var(--accent-soft); }
.back-link:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* ---------- Headings ---------- */

h1 {
  font-size: clamp(26px, 3.5vw, 38px);
  line-height: 1.15;
  margin: 10px 0 8px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(18px, 2.2vw, 24px);
  margin: 0 0 10px;
  line-height: 1.2;
}

h3 {
  font-size: 19px;
  margin: 0 0 6px;
}

.subtitle {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--ink-soft);
  margin: 0 0 18px;
}

/* ---------- Hub homepage tiles ---------- */

.hero {
  text-align: center;
  padding: 24px 0 16px;
}
.hero .badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent-hover);
  font-weight: 700;
  font-size: 16px;
  padding: 8px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tile-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 24px;
}
@media (max-width: 900px) { .tile-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 580px) { .tile-grid { grid-template-columns: 1fr; } }

.tile {
  display: block;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: transform 120ms ease, box-shadow 120ms ease, border-color 120ms ease;
  min-height: 180px;
}
.tile:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}
.tile:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
.tile .icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  font-size: 30px;
}
.tile .title {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 6px;
}
.tile .desc {
  font-size: 18px;
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.45;
}

/* ---------- Tool page panels & steps ---------- */

.panel {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin: 10px 0;
  box-shadow: var(--shadow-sm);
}

.step {
  position: relative;
  padding-left: 50px;
}
.step::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: -2px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-sm);
}

/* ---------- Form controls ---------- */

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 17px;
}

input[type="text"],
input[type="number"],
input[type="search"],
input[type="url"],
select,
textarea {
  width: 100%;
  font: inherit;
  font-size: 17px;
  padding: 10px 14px;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  min-height: 48px;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.5;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

input[type="range"] {
  width: 100%;
  height: 36px;
  accent-color: var(--accent);
}

/* ---------- Buttons ---------- */

.btn {
  appearance: none;
  border: none;
  font: inherit;
  font-size: 17px;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: var(--radius);
  cursor: pointer;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: background-color 120ms ease, transform 80ms ease, box-shadow 120ms ease;
  text-decoration: none;
}
.btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled {
  background: var(--border-strong);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border: 2px solid var(--border-strong);
}
.btn-secondary:hover { background: var(--surface-2); border-color: var(--ink); }

.btn-danger {
  background: var(--surface);
  color: var(--error);
  border: 2px solid var(--error);
}
.btn-danger:hover { background: var(--error-soft); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.btn-block { width: 100%; }

/* ---------- Drop zone ---------- */

.dropzone {
  border: 3px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 22px 16px;
  text-align: center;
  background: var(--surface-2);
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease;
}
.dropzone:hover, .dropzone.drag-over {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.dropzone .big {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.dropzone .small {
  color: var(--ink-soft);
  font-size: 15px;
}
.dropzone input[type="file"] { display: none; }

/* ---------- Banners (status) ---------- */

.banner {
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 600;
  margin: 10px 0;
  border: 2px solid transparent;
}
.banner.success { background: var(--success-soft); color: var(--success); border-color: var(--success); }
.banner.warn    { background: var(--warn-soft);    color: var(--warn);    border-color: var(--warn); }
.banner.error   { background: var(--error-soft);   color: var(--error);   border-color: var(--error); }
.banner.info    { background: var(--accent-soft);  color: var(--accent-hover); border-color: var(--accent); }

/* ---------- File list (used by image-to-pdf, pdf-merger) ---------- */

.file-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.file-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--surface-2);
  border-radius: var(--radius);
  border: 2px solid var(--border);
}
.file-list .name {
  flex: 1;
  font-weight: 600;
  font-size: 16px;
  word-break: break-word;
}
.file-list .thumb {
  width: 44px;
  height: 44px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 2px solid var(--border-strong);
  background: var(--surface);
  font-size: 17px;
  cursor: pointer;
  display: grid;
  place-items: center;
}
.icon-btn:hover { background: var(--surface-2); }
.icon-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.icon-btn.danger { color: var(--error); border-color: var(--error); }
.icon-btn.danger:hover { background: var(--error-soft); }

/* ---------- Helpers ---------- */

.row { display: flex; gap: 14px; flex-wrap: wrap; align-items: end; }
.row > * { flex: 1; min-width: 180px; }
.center { text-align: center; }
.muted { color: var(--ink-soft); }
.hidden { display: none !important; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.big-result {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  padding: 8px 0;
  color: var(--accent-hover);
}
.result-label {
  text-align: center;
  font-size: 14px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

/* ---------- Footer ---------- */

.site-footer {
  max-width: var(--maxw);
  margin: 60px auto 30px;
  padding: 0 24px;
  color: var(--ink-soft);
  font-size: 18px;
}
.faq {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-top: 18px;
}
.faq h3 { margin-top: 0; }
.faq details {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}
.faq details:first-of-type { border-top: none; padding-top: 0; }
.faq summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 20px;
  padding: 6px 0;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+ "; color: var(--accent); font-weight: 800; }
.faq details[open] summary::before { content: "− "; }
.faq p { margin: 8px 0 0; color: var(--ink-soft); }

/* ---------- Hub page — compact layout (no scroll on desktop) ---------- */

body.hub .container          { padding-top: 8px; padding-bottom: 20px; }
body.hub .hero               { padding: 6px 0 8px; }
body.hub .hero .badge        { font-size: 13px; padding: 5px 12px; margin-bottom: 8px; }
body.hub h1                  { font-size: clamp(24px, 2.8vw, 34px); margin: 6px 0 4px; }
body.hub .subtitle           { font-size: clamp(15px, 1.5vw, 18px); margin: 0 0 10px; }
body.hub .tile-grid          { gap: 12px; margin-top: 10px;
                               grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1100px)   { body.hub .tile-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 680px)    { body.hub .tile-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 420px)    { body.hub .tile-grid { grid-template-columns: 1fr; } }
body.hub .tile               { padding: 14px 16px; min-height: auto; }
body.hub .tile .icon         { width: 38px; height: 38px; border-radius: 10px;
                               font-size: 20px; margin-bottom: 8px; }
body.hub .tile .title        { font-size: 17px; margin: 0 0 3px; }
body.hub .tile .desc         { font-size: 14px; }
body.hub .site-footer        { margin-top: 20px; }
body.hub .faq                { padding: 16px 20px; }
body.hub .faq h3             { font-size: 18px; }
body.hub .faq summary        { font-size: 17px; }
body.hub .faq p              { font-size: 15px; }
body.hub .faq details        { padding: 10px 0; }

/* ---------- Language switcher ---------- */

.lang-switcher {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.lang-btn {
  appearance: none;
  border: 2px solid var(--border-strong);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 7px 13px;
  border-radius: 999px;
  cursor: pointer;
  min-height: 40px;
  line-height: 1;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
  letter-spacing: 0.01em;
}
.lang-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-hover);
}
.lang-btn.active,
.lang-btn[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.lang-btn:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Hub categories + search ---------- */

.search-wrap {
  margin: 8px 0 4px;
}

.search-bar {
  width: 100%;
  max-width: 560px;
  font: inherit;
  font-size: 17px;
  padding: 11px 18px 11px 46px;
  border: 2px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%234B5563' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") no-repeat 14px center;
  color: var(--ink);
  min-height: 50px;
  display: block;
  margin: 0 auto;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.search-bar:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.tool-section {
  margin-top: 24px;
}

.section-heading {
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--ink-soft);
  font-size: 19px;
}

body.hub .tool-section      { margin-top: 14px; }
body.hub .section-heading   { font-size: clamp(14px, 1.5vw, 17px); margin-bottom: 6px; }
body.hub .search-wrap       { margin: 6px 0 2px; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}