/* =========================================================================
   ZephyCube Network — shared theme (DARK)
   Typography: Poppins · Accent: teal -> violet gradient · Mark: cube
   Keep this file visually in sync with docs/DESIGN-SYSTEM.md (network-wide).
   ========================================================================= */

:root {
  --zc-teal:        #14b8a6;
  --zc-teal-dark:   #2dd4bf;   /* links / hover — bright for dark bg */
  --zc-violet:      #7c3aed;
  --zc-violet-lt:   #a78bfa;
  --zc-grad:        linear-gradient(135deg, #14b8a6 0%, #7c3aed 100%);
  --zc-grad-soft:   linear-gradient(135deg, rgba(20,184,166,.16), rgba(124,58,237,.18));

  --zc-ink:         #eef2f9;
  --zc-ink-soft:    #c2cad9;
  --zc-muted:       #8793a8;
  --zc-line:        #232d42;
  --zc-bg:          #0a0e1a;
  --zc-surface:     #121a2b;
  --zc-surface-2:   #1a2439;

  --zc-radius:      16px;
  --zc-radius-sm:   11px;
  --zc-shadow:      0 1px 2px rgba(0,0,0,.4), 0 14px 34px -18px rgba(0,0,0,.7);
  --zc-shadow-lg:   0 28px 66px -26px rgba(0,0,0,.8);
  --zc-container:   1120px;

  --zc-font: 'Poppins', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--zc-font);
  color: var(--zc-ink);
  background:
    radial-gradient(900px 480px at 12% -8%, rgba(20,184,166,.10), transparent 60%),
    radial-gradient(900px 480px at 92% -4%, rgba(124,58,237,.12), transparent 60%),
    var(--zc-bg);
  background-attachment: fixed;
  line-height: 1.6;
  font-weight: 400;
}
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; font-weight: 600; letter-spacing: -.01em; color: var(--zc-ink); }
a { color: var(--zc-teal-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.zc-container { max-width: var(--zc-container); margin: 0 auto; padding: 0 22px; }
.zc-muted { color: var(--zc-muted); }
.zc-ic { width: 24px; height: 24px; }

.zc-skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--zc-surface); color: var(--zc-ink); padding: 10px 16px; border-radius: 0 0 10px 0;
}
.zc-skip:focus { left: 0; }

.zc-grad-text {
  background: var(--zc-grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* The cube mark is a dark silhouette PNG — render it white on the dark theme */
.zc-logo-mark { display: block; filter: brightness(0) invert(1); }

/* ---- Header ---- */
.zc-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(10,14,26,.72);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--zc-line);
}
.zc-header-in { display: flex; align-items: center; gap: 20px; height: 66px; }
.zc-brand { display: inline-flex; }
.zc-logo { display: inline-flex; align-items: center; gap: 10px; }
.zc-logo-word { font-weight: 600; font-size: 1.16rem; color: var(--zc-ink); letter-spacing: -.02em; }
.zc-logo-word b { font-weight: 700; }
.zc-logo-sub {
  font-size: .62em; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  vertical-align: middle; padding: 2px 6px; border-radius: 6px; margin-left: 2px;
  background: var(--zc-grad); color: #fff; -webkit-text-fill-color: #fff;
}
.zc-nav { margin-left: auto; display: flex; gap: 22px; }
.zc-nav a { color: var(--zc-ink-soft); font-weight: 500; font-size: .95rem; }
.zc-nav a:hover { color: var(--zc-teal-dark); text-decoration: none; }
.zc-nav-toggle { display: none; background: none; border: 0; margin-left: auto; padding: 8px; cursor: pointer; }
.zc-nav-toggle span { display: block; width: 22px; height: 2px; background: var(--zc-ink); margin: 4px 0; border-radius: 2px; }

/* ---- Hero ---- */
.zc-hero { position: relative; padding: 74px 0 30px; text-align: center; overflow: hidden; }
.zc-hero h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); font-weight: 700; margin-bottom: .35em; }
.zc-hero p { font-size: clamp(1rem, 1.6vw, 1.18rem); color: var(--zc-ink-soft); max-width: 640px; margin: 0 auto 6px; }
.zc-hero-search { max-width: 520px; margin: 26px auto 0; position: relative; }
.zc-hero-search input {
  width: 100%; padding: 15px 18px 15px 46px; border-radius: 999px;
  border: 1px solid var(--zc-line); background: var(--zc-surface); color: var(--zc-ink);
  font: inherit; font-size: 1rem; box-shadow: var(--zc-shadow); outline: none;
}
.zc-hero-search input::placeholder { color: var(--zc-muted); }
.zc-hero-search input:focus { border-color: var(--zc-teal); box-shadow: 0 0 0 4px rgba(45,212,191,.18); }
.zc-hero-search svg { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--zc-muted); }

/* ---- Tool grid ---- */
.zc-section { padding: 30px 0 60px; }
.zc-section, .zc-cat { scroll-margin-top: 84px; }
.zc-cat { margin-top: 40px; }
.zc-cat-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.zc-cat-head h2 { font-size: 1.15rem; margin: 0; }
.zc-cat-head .zc-rule { flex: 1; height: 1px; background: var(--zc-line); }
.zc-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(232px, 1fr)); }
.zc-card {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--zc-surface); border: 1px solid var(--zc-line);
  border-radius: var(--zc-radius); padding: 18px; box-shadow: var(--zc-shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.zc-card:hover { transform: translateY(-3px); box-shadow: var(--zc-shadow-lg); border-color: rgba(45,212,191,.5); text-decoration: none; }
.zc-card-ic {
  flex: none; width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center; color: #fff; background: var(--zc-grad);
  box-shadow: 0 8px 20px -10px rgba(124,58,237,.7);
}
.zc-card-ic .zc-ic { width: 22px; height: 22px; }
.zc-card h3 { font-size: 1rem; margin: 2px 0 3px; color: var(--zc-ink); }
.zc-card p { margin: 0; font-size: .84rem; color: var(--zc-muted); line-height: 1.45; }
.zc-card.zc-card-off { opacity: .5; cursor: default; }
.zc-card.zc-card-off:hover { transform: none; box-shadow: var(--zc-shadow); border-color: var(--zc-line); }
.zc-card.zc-card-off .zc-card-ic { background: var(--zc-surface-2); color: var(--zc-muted); box-shadow: none; }
.zc-card-badge {
  display: inline-block; margin-top: 7px; font-size: .66rem; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase; padding: 2px 8px; border-radius: 999px;
  background: rgba(180,83,9,.18); color: #fbbf24; border: 1px solid rgba(180,83,9,.35);
}

/* ---- Buttons ---- */
.zc-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border-radius: 12px; border: 1px solid transparent;
  font: inherit; font-weight: 600; cursor: pointer; transition: filter .15s ease, transform .05s ease, border-color .15s ease;
}
.zc-btn:active { transform: translateY(1px); }
.zc-btn-primary { background: var(--zc-grad); color: #fff; box-shadow: 0 10px 26px -12px rgba(124,58,237,.8); }
.zc-btn-primary:hover { filter: brightness(1.08); text-decoration: none; }
.zc-btn-primary[disabled] { filter: grayscale(.5) opacity(.5); cursor: not-allowed; }
.zc-btn-ghost { background: var(--zc-surface-2); border-color: var(--zc-line); color: var(--zc-ink-soft); }
.zc-btn-ghost:hover { border-color: var(--zc-teal); color: var(--zc-teal-dark); text-decoration: none; }
.zc-btn-lg { padding: 15px 30px; font-size: 1.02rem; }

/* ---- Tool page ---- */
.zc-tool { padding: 40px 0 70px; }
.zc-tool-head { text-align: center; max-width: 640px; margin: 0 auto 26px; }
.zc-tool-head .zc-card-ic { margin: 0 auto 14px; width: 54px; height: 54px; }
.zc-tool-head h1 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
.zc-tool-head p { color: var(--zc-ink-soft); }
.zc-tool-badge {
  display: inline-block; margin-top: 10px; font-size: .74rem; font-weight: 600;
  letter-spacing: .04em; text-transform: uppercase; padding: 4px 10px; border-radius: 999px;
  background: var(--zc-grad-soft); color: var(--zc-teal-dark);
}

.zc-panel {
  background: var(--zc-surface); border: 1px solid var(--zc-line);
  border-radius: var(--zc-radius); box-shadow: var(--zc-shadow);
  max-width: 780px; margin: 0 auto; padding: 26px;
}

/* Dropzone */
.zc-drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 2px dashed #33405c; border-radius: var(--zc-radius);
  background: var(--zc-surface-2); padding: 46px 22px; text-align: center;
  cursor: pointer; transition: border-color .15s ease, background .15s ease;
}
.zc-drop:hover, .zc-drop.zc-drag { border-color: var(--zc-teal); background: rgba(45,212,191,.08); }
.zc-drop .zc-drop-ic { display: block; width: 46px; height: 46px; margin: 0 auto 14px; color: var(--zc-teal-dark); }
.zc-drop h3 { margin: 0 0 4px; font-size: 1.1rem; }
.zc-drop p { margin: 0; color: var(--zc-muted); font-size: .9rem; }
.zc-drop input[type=file] { display: none; }

/* File list */
.zc-files { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 10px; }
.zc-file {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px;
  border: 1px solid var(--zc-line); border-radius: var(--zc-radius-sm); background: var(--zc-surface-2);
}
.zc-file .zc-file-ic { flex: none; color: var(--zc-teal-dark); }
.zc-file-name { font-weight: 500; font-size: .92rem; word-break: break-all; }
.zc-file-meta { color: var(--zc-muted); font-size: .8rem; margin-left: auto; white-space: nowrap; }
.zc-file-x { border: 0; background: none; color: var(--zc-muted); cursor: pointer; font-size: 1.1rem; line-height: 1; padding: 4px; }
.zc-file-x:hover { color: #f87171; }
.zc-file[draggable=true] { cursor: grab; }
.zc-file.zc-ghost { opacity: .4; }

/* Options */
.zc-options { margin-top: 22px; display: grid; gap: 16px; }
.zc-field { display: grid; gap: 6px; }
.zc-field label { font-weight: 500; font-size: .9rem; color: var(--zc-ink); }
.zc-field .zc-hint { font-size: .8rem; color: var(--zc-muted); }
.zc-input, .zc-select, textarea.zc-input {
  width: 100%; padding: 11px 13px; border-radius: 10px; border: 1px solid var(--zc-line);
  font: inherit; background: var(--zc-surface-2); color: var(--zc-ink); outline: none;
}
.zc-input::placeholder { color: var(--zc-muted); }
.zc-input:focus, .zc-select:focus { border-color: var(--zc-teal); box-shadow: 0 0 0 3px rgba(45,212,191,.16); }
.zc-select option { background: var(--zc-surface); color: var(--zc-ink); }
.zc-row { display: flex; flex-wrap: wrap; gap: 12px; }
.zc-row > .zc-field { flex: 1; min-width: 150px; }
.zc-seg { display: inline-flex; border: 1px solid var(--zc-line); border-radius: 10px; overflow: hidden; }
.zc-seg button {
  border: 0; background: var(--zc-surface-2); padding: 9px 14px; font: inherit; font-weight: 500;
  cursor: pointer; color: var(--zc-ink-soft);
}
.zc-seg button.zc-on { background: var(--zc-grad); color: #fff; }
.zc-check { display: flex; align-items: center; gap: 9px; font-size: .92rem; }

.zc-actions { margin-top: 24px; display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* Progress + result */
.zc-progress { margin-top: 20px; display: none; }
.zc-progress.zc-show { display: block; }
.zc-bar { height: 8px; border-radius: 999px; background: var(--zc-surface-2); overflow: hidden; }
.zc-bar i { display: block; height: 100%; width: 0; background: var(--zc-grad); transition: width .25s ease; }
.zc-progress-label { margin-top: 8px; font-size: .86rem; color: var(--zc-muted); text-align: center; }

.zc-result { margin-top: 22px; text-align: center; display: none; }
.zc-result.zc-show { display: block; }
.zc-result .zc-ok { color: var(--zc-teal-dark); font-weight: 600; margin-bottom: 12px; }

.zc-note {
  margin-top: 18px; padding: 12px 14px; border-radius: 10px; font-size: .86rem;
  background: var(--zc-grad-soft); color: var(--zc-ink-soft); border: 1px solid var(--zc-line);
}
.zc-note.zc-warn { background: rgba(180,83,9,.16); color: #fcd34d; border-color: rgba(180,83,9,.35); }
.zc-note.zc-err { background: rgba(220,38,38,.14); color: #fca5a5; border-color: rgba(220,38,38,.32); }

/* Thumbnails / stage (PDF pages stay white so they read correctly) */
.zc-thumbs { margin-top: 20px; display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
.zc-thumb { position: relative; border: 1px solid var(--zc-line); border-radius: 10px; overflow: hidden; background: #fff; }
.zc-thumb canvas, .zc-thumb img { width: 100%; display: block; }
.zc-thumb .zc-thumb-n { position: absolute; bottom: 4px; left: 4px; background: rgba(10,14,26,.82); color: #fff; font-size: .7rem; padding: 1px 7px; border-radius: 6px; }
.zc-thumb .zc-thumb-tools { position: absolute; top: 4px; right: 4px; display: flex; gap: 4px; }
.zc-thumb .zc-thumb-tools button { border: 0; background: rgba(255,255,255,.92); border-radius: 6px; width: 24px; height: 24px; cursor: pointer; font-size: .8rem; display: grid; place-items: center; }
.zc-thumb.zc-del { outline: 2px solid #ef4444; opacity: .5; }
.zc-stage { margin-top: 18px; position: relative; display: inline-block; max-width: 100%; }
.zc-stage canvas { display: block; max-width: 100%; border: 1px solid var(--zc-line); border-radius: 8px; background: #fff; }

/* ---- Legal / prose ---- */
.zc-prose { max-width: 780px; margin: 0 auto; padding: 46px 0 70px; }
.zc-prose h1 { font-size: 2rem; }
.zc-prose h2 { font-size: 1.25rem; margin-top: 1.7em; }
.zc-prose p, .zc-prose li { color: var(--zc-ink-soft); }
.zc-prose ul { padding-left: 1.25em; }
.zc-prose li { margin: .3em 0; }
.zc-prose code { background: var(--zc-surface-2); border: 1px solid var(--zc-line); padding: 1px 6px; border-radius: 6px; font-size: .88em; }
.zc-prose .zc-updated { color: var(--zc-muted); font-size: .9rem; }

/* ---- Footer ---- */
.zc-footer { background: #070b14; color: #b7c0d2; padding: 52px 0 26px; margin-top: 40px; border-top: 1px solid var(--zc-line); }
.zc-footer a { color: #b7c0d2; }
.zc-footer a:hover { color: #fff; }
.zc-footer .zc-logo-word { color: #fff; }
.zc-footer-grid { display: grid; gap: 30px; grid-template-columns: 1.6fr repeat(4, 1fr); }
.zc-footer-brand .zc-muted { color: #8793a8; margin: 12px 0 0; font-size: .9rem; max-width: 240px; }
.zc-footer-col h4 { color: #fff; font-size: .82rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 12px; }
.zc-footer-col ul { list-style: none; margin: 0; padding: 0; }
.zc-footer-col li { margin: 7px 0; }
.zc-footer-col a { font-size: .88rem; }
.zc-footer-base {
  margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--zc-line);
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 6px;
  font-size: .9rem; color: #8793a8;
}
.zc-ver {
  font-weight: 700;
  background: var(--zc-grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .zc-footer-grid { grid-template-columns: repeat(2, 1fr); }
  .zc-footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 720px) {
  .zc-nav { display: none; position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: var(--zc-surface); border-bottom: 1px solid var(--zc-line); padding: 8px 22px; }
  .zc-nav a { padding: 12px 0; border-bottom: 1px solid var(--zc-line); }
  body.zc-nav-open .zc-nav { display: flex; }
  .zc-nav-toggle { display: block; }
  .zc-footer-grid { grid-template-columns: 1fr; }
}

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

:focus-visible { outline: 3px solid rgba(45,212,191,.55); outline-offset: 2px; border-radius: 6px; }