/* =========================================================================
   Image Tools - design system
   Calm utility UI: white surfaces, one accent, restrained motion.
   ========================================================================= */

:root {
  --page:        #f5f7fa;
  --surface:     #ffffff;
  --surface-alt: #fafbfd;
  --ink:         #1b1f26;
  --ink-soft:    #5a6573;
  --ink-faint:   #8b95a3;
  --line:        #e2e7ee;
  --line-strong: #cdd5e0;
  --brand:       #1656d3;
  --brand-hover: #11449f;
  --brand-tint:  #ecf2ff;
  --ok:          #12795a;
  --ok-tint:     #e7f6f0;
  --warn:        #9a5b00;
  --warn-tint:   #fdf3e2;
  --danger:      #b62828;
  --danger-tint: #fdecec;

  --radius-sm: 8px;
  --radius:    12px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(20, 30, 50, .06);
  --shadow:    0 2px 10px rgba(20, 30, 50, .07);
  --shadow-lg: 0 12px 34px rgba(20, 30, 50, .12);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --container: 1120px;
  --header-h: 64px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --page:        #0e1116;
    --surface:     #161b22;
    --surface-alt: #1b212a;
    --ink:         #e8ecf1;
    --ink-soft:    #a8b3c1;
    --ink-faint:   #7b8796;
    --line:        #262d38;
    --line-strong: #39424f;
    --brand:       #6d9bff;
    --brand-hover: #8fb2ff;
    --brand-tint:  #17233a;
    --ok:          #4cc59a;
    --ok-tint:     #12241e;
    --warn:        #e0a95c;
    --warn-tint:   #2a2113;
    --danger:      #f27a7a;
    --danger-tint: #2b1618;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
    --shadow:    0 2px 10px rgba(0, 0, 0, .45);
    --shadow-lg: 0 12px 34px rgba(0, 0, 0, .55);
  }
}

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

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

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg, canvas { max-width: 100%; }
img { height: auto; }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.22; letter-spacing: -.018em; font-weight: 650; }
h1 { font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.6rem); }
h2 { font-size: clamp(1.3rem, 1.05rem + 1vw, 1.7rem); }
h3 { font-size: 1.14rem; }
p  { margin: 0 0 1em; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 20px; }
.prose { max-width: 72ch; }
.muted { color: var(--ink-soft); }
.small { font-size: .875rem; }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.stack > * + * { margin-top: 1rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

/* ------------------------------------------------------------------ header */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 12px;
  height: var(--header-h);
}
.logo {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 680; font-size: 1.05rem; color: var(--ink); letter-spacing: -.02em;
  text-decoration: none; flex: 0 0 auto;
}
.logo:hover { text-decoration: none; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: var(--brand); color: #fff;
  display: grid; place-items: center;
}
.logo-mark svg { width: 17px; height: 17px; }

.nav { display: flex; align-items: center; gap: 2px; margin-inline-start: 14px; }
.nav-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  color: var(--ink-soft); font-size: .94rem; font-weight: 520;
  background: none; border: 0; cursor: pointer; font-family: inherit;
}
.nav-link:hover { background: var(--surface-alt); color: var(--ink); text-decoration: none; }
.nav-link[aria-expanded="true"] { background: var(--brand-tint); color: var(--brand); }
.nav-link .chev { width: 14px; height: 14px; transition: transform .16s ease; }
.nav-link[aria-expanded="true"] .chev { transform: rotate(180deg); }

.header-tools { margin-inline-start: auto; display: flex; align-items: center; gap: 6px; }

.icon-btn {
  width: 38px; height: 38px; display: grid; place-items: center;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  background: none; color: var(--ink-soft); cursor: pointer;
}
.icon-btn:hover { background: var(--surface-alt); color: var(--ink); }
.icon-btn svg { width: 19px; height: 19px; }

/* mega menu */
.menu-panel {
  position: absolute; inset-inline-start: 0; inset-block-start: calc(var(--header-h) - 4px);
  width: 100%;
}
.menu-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: 18px; display: grid; gap: 6px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}
.menu-item {
  display: flex; gap: 11px; padding: 11px; border-radius: var(--radius);
  color: var(--ink); align-items: flex-start;
}
.menu-item:hover { background: var(--surface-alt); text-decoration: none; }
.menu-item .ico { width: 20px; height: 20px; color: var(--brand); flex: none; margin-top: 2px; }
.menu-item b { display: block; font-weight: 600; font-size: .95rem; }
.menu-item span { color: var(--ink-soft); font-size: .84rem; line-height: 1.45; }
[hidden] { display: none !important; }

/* language menu */
.lang-menu {
  position: absolute; inset-inline-end: 20px; inset-block-start: calc(var(--header-h) - 4px);
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); padding: 8px; width: min(420px, calc(100vw - 40px));
  display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 2px;
}
.lang-menu a {
  padding: 8px 10px; border-radius: var(--radius-sm); color: var(--ink); font-size: .9rem;
}
.lang-menu a:hover { background: var(--surface-alt); text-decoration: none; }
.lang-menu a[aria-current="true"] { background: var(--brand-tint); color: var(--brand); font-weight: 600; }

/* search overlay */
.search-overlay {
  position: fixed; inset: 0; z-index: 90; background: rgba(15, 20, 30, .35);
  display: flex; justify-content: center; padding: 8vh 20px;
}
.search-panel {
  width: min(640px, 100%); height: max-content;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); overflow: hidden;
}
.search-panel form { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.search-panel input {
  flex: 1; border: 0; background: none; color: var(--ink);
  font: inherit; font-size: 1.05rem; outline: none;
}
.search-results { max-height: 52vh; overflow-y: auto; padding: 6px; }
.search-results a {
  display: flex; gap: 10px; align-items: center; padding: 10px 12px;
  border-radius: var(--radius-sm); color: var(--ink);
}
.search-results a:hover, .search-results a.is-active { background: var(--surface-alt); text-decoration: none; }
.search-results .ico { width: 18px; height: 18px; color: var(--brand); }
.search-empty { padding: 22px 16px; color: var(--ink-soft); font-size: .93rem; }

/* mobile nav */
.mobile-nav { border-top: 1px solid var(--line); background: var(--surface); padding: 12px 0 18px; }
.mobile-nav a { display: block; padding: 10px 4px; color: var(--ink); font-weight: 520; }
.mobile-nav .group-label {
  font-size: .78rem; color: var(--ink-faint); margin: 12px 0 4px; font-weight: 600;
}

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 18px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  font: inherit; font-size: .95rem; font-weight: 560; cursor: pointer;
  transition: background .14s ease, border-color .14s ease, color .14s ease;
}
.btn:hover { background: var(--surface-alt); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn svg { width: 17px; height: 17px; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hover); border-color: var(--brand-hover); }
.btn-ghost { border-color: transparent; background: none; color: var(--ink-soft); }
.btn-ghost:hover { background: var(--surface-alt); color: var(--ink); }
.btn-lg { padding: 13px 24px; font-size: 1rem; }
.btn-sm { padding: 7px 12px; font-size: .86rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ----------------------------------------------------------------- cards */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 22px;
}
.card-flat { box-shadow: none; }

.grid { display: grid; gap: 14px; }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); }

.tool-card {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px; color: var(--ink);
  transition: border-color .14s ease, box-shadow .14s ease;
}
.tool-card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); text-decoration: none; }
.tool-card .badge-icon {
  width: 38px; height: 38px; flex: none; border-radius: 10px;
  background: var(--brand-tint); color: var(--brand); display: grid; place-items: center;
}
.tool-card .badge-icon svg, .tool-card .badge-icon img { width: 19px; height: 19px; }
.tool-card b { display: block; font-weight: 600; font-size: .96rem; margin-bottom: 2px; }
.tool-card span { color: var(--ink-soft); font-size: .855rem; line-height: 1.5; display: block; }

.category-card {
  display: block; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 22px; color: var(--ink);
}
.category-card:hover { border-color: var(--line-strong); text-decoration: none; }
.category-card .badge-icon {
  width: 42px; height: 42px; border-radius: 12px; background: var(--brand-tint);
  color: var(--brand); display: grid; place-items: center; margin-bottom: 14px;
}
.category-card .badge-icon svg { width: 21px; height: 21px; }
.category-card h3 { margin-bottom: 4px; }
.count { color: var(--ink-faint); font-size: .82rem; }

/* --------------------------------------------------------------- section */
.section { padding: 46px 0; }
.section-tight { padding: 28px 0; }
.section-head { margin-bottom: 20px; display: flex; align-items: end; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.section-head h2 { margin: 0; }
.section-head p { margin: 4px 0 0; color: var(--ink-soft); font-size: .95rem; }

/* ------------------------------------------------------------------ hero */
.hero { padding: 54px 0 30px; text-align: center; }
.hero h1 { margin-bottom: 10px; }
.hero .lede { color: var(--ink-soft); font-size: 1.06rem; max-width: 56ch; margin: 0 auto 26px; }

.tool-shell {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  padding: 26px; text-align: start;
}
.hero .tool-shell { max-width: 760px; margin-inline: auto; }

/* --------------------------------------------------------- form controls */
.field { display: grid; gap: 6px; }
.field label { font-size: .875rem; font-weight: 560; color: var(--ink-soft); }
.input, select.input, textarea.input {
  width: 100%; padding: 12px 14px; font: inherit; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm); outline: none;
}
.input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-tint); }
.input-group { display: flex; gap: 10px; flex-wrap: wrap; }
.input-group .input { flex: 1 1 260px; }
.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > * { flex: 1 1 180px; }
input[type="range"] { width: 100%; accent-color: var(--brand); }
.checkbox { display: flex; align-items: center; gap: 8px; font-size: .92rem; color: var(--ink-soft); }
.checkbox input { accent-color: var(--brand); width: 16px; height: 16px; }

/* ------------------------------------------------------------- dropzone */
.dropzone {
  border: 1.5px dashed var(--line-strong); border-radius: var(--radius);
  background: var(--surface-alt); padding: 30px 20px; text-align: center;
  cursor: pointer; transition: border-color .14s ease, background .14s ease;
}
.dropzone:hover, .dropzone.is-over { border-color: var(--brand); background: var(--brand-tint); }
.dropzone .dz-icon { width: 34px; height: 34px; color: var(--brand); margin-bottom: 8px; }
.dropzone b { display: block; font-size: 1rem; margin-bottom: 3px; }
.dropzone span { color: var(--ink-soft); font-size: .875rem; }
.dropzone input[type="file"] { display: none; }

/* --------------------------------------------------------------- results */
.progress { height: 6px; border-radius: var(--radius-pill); background: var(--line); overflow: hidden; }
.progress > i { display: block; height: 100%; width: 0; background: var(--brand); transition: width .2s ease; }

.notice {
  display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px;
  border-radius: var(--radius-sm); font-size: .9rem; border: 1px solid transparent;
}
.notice svg { width: 17px; height: 17px; flex: none; margin-top: 2px; }
.notice-error { background: var(--danger-tint); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 25%, transparent); }
.notice-info  { background: var(--brand-tint); color: var(--brand); border-color: color-mix(in srgb, var(--brand) 22%, transparent); }
.notice-ok    { background: var(--ok-tint); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 25%, transparent); }
.notice-warn  { background: var(--warn-tint); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 25%, transparent); }

.result-list { display: grid; gap: 10px; }
.result-item {
  display: flex; gap: 14px; align-items: center; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
}
.result-item .thumb {
  width: 54px; height: 54px; flex: none; border-radius: 9px; overflow: hidden;
  display: grid; place-items: center; border: 1px solid var(--line);
  background-color: var(--surface-alt);
  background-image:
    linear-gradient(45deg, var(--line) 25%, transparent 25%),
    linear-gradient(-45deg, var(--line) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--line) 75%),
    linear-gradient(-45deg, transparent 75%, var(--line) 75%);
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0;
}
.result-item .thumb img { max-width: 40px; max-height: 40px; image-rendering: -webkit-optimize-contrast; }
.result-item .meta { min-width: 0; flex: 1; }
.result-item .meta b { display: block; font-size: .93rem; font-weight: 600; }
.result-item .meta span { display: block; color: var(--ink-soft); font-size: .82rem; word-break: break-all; }
.result-item .actions { display: flex; gap: 8px; flex: none; }

.stat-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px;
  border-radius: var(--radius-pill); background: var(--surface-alt);
  border: 1px solid var(--line); font-size: .82rem; color: var(--ink-soft);
}
.chip b { color: var(--ink); font-weight: 600; }
.chip-ok { background: var(--ok-tint); border-color: color-mix(in srgb, var(--ok) 25%, transparent); color: var(--ok); }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.compare figure { margin: 0; }
.compare figcaption { font-size: .8rem; color: var(--ink-faint); margin-bottom: 6px; }
.compare img { width: 100%; border-radius: var(--radius-sm); border: 1px solid var(--line); }

/* --------------------------------------------------------------- article */
.article { max-width: 72ch; }
.article h2 { margin-top: 1.8em; }
.article h3 { margin-top: 1.5em; }
.article ul, .article ol { padding-inline-start: 1.25em; margin: 0 0 1em; }
.article li { margin-bottom: .4em; }
.article table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .92rem; }
.article th, .article td { border: 1px solid var(--line); padding: 9px 12px; text-align: start; }
.article th { background: var(--surface-alt); font-weight: 600; }
.article code { font-family: var(--mono); font-size: .9em; background: var(--surface-alt); padding: 2px 5px; border-radius: 5px; }

/* -------------------------------------------------------------------- faq */
.faq { max-width: 72ch; display: grid; gap: 8px; }
.faq details {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: 0 16px;
}
.faq details[open] { border-color: var(--line-strong); }
.faq summary {
  cursor: pointer; padding: 14px 0; font-weight: 570; font-size: .98rem;
  list-style: none; display: flex; justify-content: space-between; gap: 12px; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; width: 9px; height: 9px; flex: none;
  border-right: 2px solid var(--ink-faint); border-bottom: 2px solid var(--ink-faint);
  transform: rotate(45deg) translateY(-2px); transition: transform .16s ease;
}
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.faq .faq-body { padding-bottom: 14px; color: var(--ink-soft); font-size: .94rem; }

/* ------------------------------------------------------------ breadcrumb */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: .84rem; color: var(--ink-faint); padding: 18px 0 0; }
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb li { list-style: none; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumb li + li::before { content: "/"; margin-inline-end: 6px; color: var(--line-strong); }

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: 50px; padding: 44px 0 26px; }
.footer-grid { display: grid; gap: 28px; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
.footer-grid h4 { font-size: .9rem; margin-bottom: 10px; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.footer-grid a { color: var(--ink-soft); font-size: .89rem; }
.footer-bottom {
  margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  color: var(--ink-faint); font-size: .84rem;
}

/* ------------------------------------------------------------------- 404 */
.error-page { text-align: center; padding: 70px 0 30px; }
.error-code { font-size: clamp(3.4rem, 10vw, 5.4rem); font-weight: 700; letter-spacing: -.04em; color: var(--brand); line-height: 1; }

/* ----------------------------------------------------------------- misc */
.ad-slot { margin: 26px 0; min-height: 0; }
.ad-slot:empty { display: none; }
.spinner {
  width: 17px; height: 17px; border-radius: 50%;
  border: 2px solid color-mix(in srgb, currentColor 30%, transparent);
  border-top-color: currentColor; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

@media (max-width: 860px) {
  .nav, .header-tools .desktop-only { display: none; }
  .hero { padding: 34px 0 20px; }
  .tool-shell { padding: 18px; }
  .compare { grid-template-columns: 1fr; }
  .section { padding: 34px 0; }
}
@media (min-width: 861px) {
  .mobile-only { display: none; }
}

/* RTL */
[dir="rtl"] .search-panel input { text-align: right; }