/* ============================================================
   Resim Birleştirme — PREMIUM dark-purple SaaS design (Visuo/Mufi)
   "WAO on open": gradient orbs, glassmorphism, 3D tilt,
   micro-interactions. Zero frameworks, zero remote assets.
   Font: Inter (OFL), self-hosted latin + latin-ext in assets/fonts/
   (declared in index.html <style>).
   Class names and IDs are identical to the current build: app.js
   depends on them (drag, dragging, is-active, move-src, drop-before,
   drop-after, err), so nothing was renamed.
   Design tokens from the reference homepage-premium system.
   NOTE: .tool-card entrance animation uses fill-mode `backwards`
   (not `both`) so the JS 3D-tilt (inline transform) keeps working —
   animation fill `forwards` would permanently override inline styles.
   ============================================================ */

:root {
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* brand — deep purple-black, violet, orange accent */
  --bg-950: #12101d;
  --bg-900: #181527;
  --bg-800: #1f1b33;
  --violet-500: #8b5cf6;
  --violet-400: #a78bfa;
  --violet-700: #6d28d9;
  --orange-400: #fb923c;
  --orange-500: #f97316;

  --ink: #f4f2fb;
  --muted: #a9a3c7;
  --faint: #7c76a0;
  --line: rgba(139, 92, 246, 0.22);
  --card: rgba(31, 27, 51, 0.72);
  --card-solid: #1f1b33;
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.12);
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.10);
  --warning: #fbbf24;
  --pink: #f472b6;
  --cyan: #22d3ee;

  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 28px -8px rgba(0,0,0,.5);
  --shadow-lg: 0 2px 6px rgba(0,0,0,.35), 0 24px 60px -16px rgba(139,92,246,.35);
  --shadow-lift: 0 18px 50px -12px rgba(139, 92, 246, 0.45);
  --focus-ring: 0 0 0 3px rgba(139, 92, 246, 0.45);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --r: 18px;
  --r-sm: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-950);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 22px; }
.wrap.narrow { max-width: 780px; }
img { max-width: 100%; }
a { color: var(--violet-400); }

/* The `hidden` attribute must win over any author `display`. */
[hidden] { display: none !important; }

/* ---------- entrance animations ---------- */
@keyframes float-in { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes card-in { from { opacity: 0; transform: translateY(26px) rotateX(6deg); } to { opacity: 1; transform: none; } }
@keyframes bounce-icon { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(18, 16, 29, 0.78);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-in { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; }
.brand:hover .brand-name {
  background: linear-gradient(120deg, var(--violet-400), var(--orange-400));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-mark { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5px; width: 26px; height: 26px; }
.brand-mark i { border-radius: 6px; background: linear-gradient(135deg, var(--violet-500), var(--violet-400)); }
.brand-mark i:nth-child(2) { background: linear-gradient(135deg, var(--violet-400), var(--pink)); }
.brand-mark i:nth-child(3) { background: linear-gradient(135deg, var(--pink), var(--orange-400)); }
.brand-mark i:nth-child(4) { background: linear-gradient(135deg, var(--success), var(--cyan)); }
.brand-mark.sm { width: 20px; height: 20px; }
.brand-name {
  background: linear-gradient(120deg, var(--violet-400), var(--orange-400));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.site-nav { display: flex; gap: 26px; }
.site-nav a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: 0.95rem; transition: color 0.15s ease; }
.site-nav a:hover { color: var(--violet-400); }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 72px 0 56px; perspective: 1200px; }
.orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.55; pointer-events: none; animation: drift 14s ease-in-out infinite alternate; }
.orb-a { width: 460px; height: 460px; left: -130px; top: -130px; background: radial-gradient(circle, rgba(139,92,246,0.5), transparent 65%); }
.orb-b { width: 400px; height: 400px; right: -110px; top: 40px; background: radial-gradient(circle, rgba(249,115,22,0.28), transparent 65%); animation-delay: -6s; }
@keyframes drift { from { transform: translate(0,0) scale(1); } to { transform: translate(40px,30px) scale(1.08); } }
.hero .wrap { position: relative; }
.hero-copy { text-align: center; max-width: 720px; margin: 0 auto 34px; }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 16px; font-size: 0.82rem; font-weight: 700; color: var(--muted);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  animation: float-in 0.7s var(--ease-out) both;
}
.kicker .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 4px rgba(52,211,153,0.15); }
h1 {
  font-size: clamp(2.2rem, 5.4vw, 3.6rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.08;
  margin: 20px 0 14px;
  background: linear-gradient(120deg, #f4f2fb 20%, var(--violet-400) 60%, var(--orange-400));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: float-in 0.7s var(--ease-out) 0.08s both;
}
.lede { font-size: 1.12rem; color: var(--muted); max-width: 620px; margin: 0 auto; animation: float-in 0.7s var(--ease-out) 0.14s both; }
.lede strong { color: var(--ink); }
.trust-row { list-style: none; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 22px; animation: float-in 0.7s var(--ease-out) 0.2s both; }
.trust-row li {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 9px 15px; font-size: 0.88rem; font-weight: 600; color: var(--muted);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: transform 0.2s var(--ease-out), border-color 0.2s ease;
}
.trust-row li:hover { transform: translateY(-2px); border-color: rgba(139,92,246,0.5); }
.trust-row svg { width: 18px; height: 18px; color: var(--success); }

/* ---------- tool card (3D glass) ---------- */
.tool-card {
  position: relative;
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.06), transparent 32%), var(--card);
  border: 1px solid var(--line);
  border-radius: 26px;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 24px 70px -18px rgba(0,0,0,0.65), 0 0 0 1px rgba(139,92,246,0.12), 0 0 44px -12px rgba(139,92,246,0.28);
  padding: 30px; max-width: 860px; margin: 0 auto;
  animation: card-in 0.8s var(--ease-out) 0.15s backwards;
  transform: perspective(1400px) rotateX(0);
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s var(--ease-out);
}
.tool-card:hover { transform: perspective(1400px) rotateX(0.6deg); }

/* JS 3D tilt: appended verbatim by tilt-snippet.js — the class below is
   the hook; inline transform from JS takes over on pointer move. */
.tilt-3d { transform-style: preserve-3d; will-change: transform; transition: transform 0.18s ease-out; }

/* ---------- dropzone ---------- */
.dropzone {
  border: 2.5px dashed rgba(139, 92, 246, 0.45); border-radius: var(--r);
  padding: 52px 24px; text-align: center; cursor: pointer;
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s var(--ease-out);
  background: rgba(139, 92, 246, 0.06);
}
.dropzone:hover, .dropzone.drag {
  border-color: var(--violet-400); background: rgba(139, 92, 246, 0.12); transform: scale(1.01);
}
.dropzone:focus { outline: none; box-shadow: var(--focus-ring); border-color: var(--violet-400); }
.dz-icon { width: 64px; height: 64px; margin: 0 auto 14px; color: var(--violet-400); animation: bounce-icon 2.6s ease-in-out infinite; }
.dz-icon svg { width: 100%; height: 100%; }
.dz-title { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }
.dz-sub { color: var(--muted); font-size: 0.92rem; margin-top: 6px; }
.dz-cta { color: var(--orange-400); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- workspace ---------- */
.workspace { margin-top: 8px; }
.ws-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.ws-count { font-size: 1.02rem; }
.ws-count strong { color: var(--violet-400); }
.ws-hint { color: var(--faint); font-size: 0.85rem; font-weight: 400; }
.ws-actions { display: flex; gap: 10px; }

/* ---------- buttons ---------- */
.btn {
  font: inherit; font-weight: 700; border-radius: 12px; padding: 10px 18px;
  cursor: pointer; border: 1px solid transparent;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.15s ease;
}
.btn:focus { outline: none; box-shadow: var(--focus-ring); }
.btn.ghost { background: rgba(139,92,246,0.08); border-color: var(--line); color: var(--muted); font-size: 0.88rem; }
.btn.ghost:hover { border-color: var(--violet-400); color: var(--violet-400); }
.btn.ghost.danger:hover { border-color: var(--danger); color: var(--danger); }
.btn.primary {
  background: linear-gradient(135deg, var(--violet-500), var(--violet-700)); color: #fff;
  box-shadow: 0 10px 24px -8px rgba(139, 92, 246, 0.55);
}
.btn.primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 16px 32px -8px rgba(139, 92, 246, 0.65); }
.btn.primary:active:not(:disabled) { transform: translateY(0); }
.btn.primary:disabled { opacity: 0.55; transform: none; cursor: wait; }
.btn.big { font-size: 1.08rem; padding: 15px 34px; border-radius: 15px; width: 100%; }

/* ---------- thumbnail strip ---------- */
.thumb-strip { list-style: none; display: flex; gap: 12px; overflow-x: auto; padding: 6px 2px 14px; scrollbar-width: thin; scrollbar-color: var(--violet-500) transparent; }
.thumb {
  position: relative; flex: 0 0 104px; width: 104px; height: 104px;
  border-radius: 14px; overflow: hidden; border: 2px solid var(--line);
  cursor: grab; background: var(--bg-800);
  transition: transform 0.2s var(--ease-out), border-color 0.2s ease, box-shadow 0.2s ease;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; pointer-events: none; }
.thumb:hover { border-color: var(--violet-400); transform: translateY(-3px); box-shadow: var(--shadow-lift); }
.thumb.dragging { opacity: 0.45; transform: scale(0.94); }
.thumb.drop-before { box-shadow: -4px 0 0 var(--violet-400); }
.thumb.drop-after { box-shadow: 4px 0 0 var(--violet-400); }
.thumb.move-src { outline: 3px solid var(--pink); outline-offset: 2px; }
.thumb .ord {
  position: absolute; left: 6px; top: 6px;
  background: rgba(18, 16, 29, 0.85); color: var(--violet-400);
  font-size: 0.72rem; font-weight: 800; min-width: 24px; height: 24px;
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line);
}
.thumb .rm {
  position: absolute; right: 6px; top: 6px; width: 24px; height: 24px;
  border-radius: 8px; border: none; background: rgba(248, 113, 113, 0.92); color: #fff;
  font-size: 15px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s ease;
}
.thumb .rm:hover { background: #dc2626; }

/* ---------- options ---------- */
.options {
  background: rgba(18, 16, 29, 0.5); border: 1px solid var(--line);
  border-radius: var(--r); padding: 20px; margin: 6px 0 18px;
}
.opt-group { border: none; }
.opt-group legend { font-weight: 700; font-size: 0.9rem; margin-bottom: 10px; padding: 0; color: var(--ink); }
.opt-group.inline legend { margin-bottom: 8px; }
.seg { display: flex; gap: 8px; flex-wrap: wrap; }
.seg-btn {
  font: inherit; display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 12px; border: 1.5px solid var(--line);
  background: rgba(139, 92, 246, 0.06); color: var(--muted);
  font-weight: 600; font-size: 0.92rem; cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease, transform 0.18s var(--ease-out), box-shadow 0.18s ease;
}
.seg-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; }
.seg-btn:hover { border-color: var(--violet-400); color: var(--ink); transform: translateY(-1px); }
.seg-btn:focus { outline: none; box-shadow: var(--focus-ring); }
.seg-btn.is-active {
  background: linear-gradient(135deg, var(--violet-500), var(--violet-700));
  border-color: transparent; color: #fff;
  box-shadow: 0 6px 16px -6px rgba(139, 92, 246, 0.5);
}
.seg-btn.is-active svg { stroke: #fff; }
.seg.small .seg-btn { padding: 8px 20px; }
.opt-row { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 16px; }
.opt { display: flex; flex-direction: column; gap: 8px; font-size: 0.9rem; font-weight: 600; flex: 1; min-width: 200px; color: var(--ink); }
.opt output { color: var(--orange-400); font-weight: 800; }
input[type=range] {
  -webkit-appearance: none; appearance: none; height: 6px; border-radius: 99px;
  background: linear-gradient(90deg, var(--violet-500) var(--p,50%), rgba(139,92,246,0.18) var(--p,50%));
  outline: none; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid var(--violet-500);
  box-shadow: 0 4px 12px rgba(139,92,246,0.5); cursor: grab;
}
input[type=range]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 3px solid var(--violet-500); cursor: grab;
}
input[type=range]:focus { box-shadow: var(--focus-ring); }
.color-wrap { display: flex; align-items: center; gap: 10px; }
input[type=color] {
  -webkit-appearance: none; appearance: none; width: 44px; height: 34px;
  border: 2px solid var(--line); border-radius: 10px; background: none; cursor: pointer; padding: 2px;
}
input[type=color]::-webkit-color-swatch-wrapper { padding: 2px; }
input[type=color]::-webkit-color-swatch { border: none; border-radius: 6px; }
.color-name { color: var(--faint); font-weight: 500; }

/* ---------- preview ---------- */
.preview-wrap { margin-bottom: 18px; }
.preview-label { font-weight: 700; margin-bottom: 10px; }
.preview-label span { color: var(--faint); font-weight: 500; font-size: 0.88rem; }
.preview-box {
  background: rgba(18, 16, 29, 0.6); border: 1px solid var(--line); border-radius: var(--r);
  padding: 18px; display: flex; justify-content: center; max-height: 520px; overflow: auto;
}
.preview-box canvas { max-width: 100%; height: auto; border-radius: 8px; box-shadow: var(--shadow-lg); background: #fff; }
.ws-foot { text-align: center; }
.fine { color: var(--faint); font-size: 0.85rem; margin-top: 12px; min-height: 1.4em; }
.fine.err { color: var(--danger); font-weight: 600; }

/* ---------- content sections ---------- */
.section { padding: 64px 0; }
.section.alt {
  background: rgba(31, 27, 51, 0.4);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.sec-kicker {
  display: inline-block; font-size: 0.8rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--violet-400); background: rgba(139, 92, 246, 0.12);
  border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 14px; margin-bottom: 14px;
}
.section h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); font-weight: 800; letter-spacing: -0.025em; margin-bottom: 10px; }
.sec-lede { color: var(--muted); font-size: 1.05rem; max-width: 640px; margin-bottom: 30px; }
.steps { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; counter-reset: st; }
.step-card, .feat-card, .use-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r);
  padding: 24px; box-shadow: var(--shadow);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: transform 0.25s var(--ease-out), border-color 0.2s ease, box-shadow 0.25s ease;
  position: relative;
}
.step-card:hover, .feat-card:hover, .use-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lift); border-color: rgba(139,92,246,0.5);
}
.step-n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 12px;
  background: linear-gradient(135deg, var(--violet-500), var(--violet-700));
  color: #fff; font-weight: 800; margin-bottom: 12px;
  box-shadow: 0 6px 16px -6px rgba(139, 92, 246, 0.6);
}
.step-card h3, .feat-card h3, .use-card h3 { font-size: 1.05rem; margin-bottom: 8px; letter-spacing: -0.01em; }
.step-card p, .feat-card p, .use-card p { color: var(--muted); font-size: 0.93rem; }
.step-card p strong, .feat-card p strong, .use-card p strong { color: var(--ink); }
.feat-grid, .use-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.section.alt .feat-card, .section.alt .use-card { background: rgba(18, 16, 29, 0.55); }

/* ---------- comparison table ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--r); border: 1px solid var(--line); box-shadow: var(--shadow); background: var(--card); }
table.cmp { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 640px; }
.cmp th, .cmp td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--line); color: var(--ink); }
.cmp thead th { background: rgba(139, 92, 246, 0.1); font-weight: 800; color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }
.cmp tbody tr:last-child td { border-bottom: none; }
.cmp td.hl, .cmp th.hl { background: rgba(139, 92, 246, 0.12); font-weight: 700; color: var(--violet-400); }
.cmp tbody tr { transition: background 0.15s ease; }
.cmp tbody tr:hover td { background: rgba(139, 92, 246, 0.06); }

/* ---------- limits ---------- */
.limits { list-style: none; display: grid; gap: 12px; }
.limits li {
  background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--orange-400);
  border-radius: 12px; padding: 14px 18px; font-size: 0.95rem; color: var(--muted);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.limits strong { color: var(--ink); }

/* ---------- faq ---------- */
.faq { display: grid; gap: 12px; }
.faq details {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); overflow: hidden;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.faq details:hover { border-color: rgba(139,92,246,0.45); }
.faq details[open] { box-shadow: var(--shadow-lift); border-color: rgba(139,92,246,0.5); }
.faq summary {
  padding: 17px 20px; font-weight: 700; cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 1.4rem; color: var(--violet-400); font-weight: 400; flex-shrink: 0; transition: transform 0.2s var(--ease-out); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq summary:focus { outline: none; box-shadow: var(--focus-ring); border-radius: 8px; }
.faq details p { padding: 0 20px 18px; color: var(--muted); font-size: 0.94rem; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 34px 0; background: rgba(18, 16, 29, 0.6); color: var(--faint); }
.foot-in { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.brand-line { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.brand-line strong {
  background: linear-gradient(120deg, var(--violet-400), var(--orange-400));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .site-nav { display: none; }
  .hero { padding: 48px 0 40px; }
  .tool-card { padding: 20px; border-radius: 20px; }
  .dropzone { padding: 36px 16px; }
  .opt-row { flex-direction: column; gap: 14px; }
  .ws-head { flex-direction: column; align-items: stretch; }
  .ws-actions { justify-content: stretch; }
  .ws-actions .btn { flex: 1; }
  .section { padding: 44px 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
  html { scroll-behavior: auto; }
}

body { overflow-x: hidden; }
html, body { overflow-x: clip; }