/* =====================================================================
   Video Effects Lab — stylesheet
   Light SaaS surface, dark navigation, indigo→violet accent.
   Palette pulled from the approved mockup.
   ===================================================================== */

:root{
  --bg:#f5f6f9;
  --surface:#ffffff;
  --surface-2:#fafbfc;
  --border:#e7e9f0;
  --border-strong:#d6d9e4;
  --ink:#141826;
  --ink-2:#4a4f63;
  --muted:#8a90a6;
  --nav:#0a0e1c;
  --nav-ink:#e9ebf5;

  --indigo:#6d5ef8;
  --violet:#8b5cf6;
  --accent:#6d5ef8;
  --accent-grad:linear-gradient(135deg,#6d5ef8 0%,#8b5cf6 100%);
  --accent-soft:#efeefe;

  --pink:#ec4899;
  --orange:#f97316;
  --blue:#3b82f6;
  --cyan:#06b6d4;
  --amber:#f59e0b;

  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(20,24,38,.04),0 8px 24px rgba(20,24,38,.05);
  --shadow-lg:0 12px 40px rgba(109,94,248,.18);

  --font: "Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

[data-theme="dark"]{
  --bg:#0b0d18;
  --surface:#13162a;
  --surface-2:#171a30;
  --border:#262a45;
  --border-strong:#323758;
  --ink:#eef0fa;
  --ink-2:#b6bad0;
  --muted:#7d83a0;
  --nav:#05060f;
  --accent-soft:#1e1f44;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.45);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);
  -webkit-font-smoothing:antialiased;line-height:1.5;
  transition:background .25s ease,color .25s ease;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none}
::selection{background:var(--accent);color:#fff}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.05rem;border-radius:10px;
  font-weight:600;font-size:.92rem;border:1px solid transparent;transition:all .18s ease}
.btn-primary{background:var(--accent-grad);color:#fff;box-shadow:0 6px 18px rgba(109,94,248,.32)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 26px rgba(109,94,248,.42)}
.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--border-strong)}
.btn-ghost:hover{background:var(--surface-2)}
.btn-block{width:100%;justify-content:center}

/* ---------- nav ---------- */
.nav{background:var(--nav);color:var(--nav-ink);position:sticky;top:0;z-index:50}
.nav-inner{max-width:1480px;margin:0 auto;display:flex;align-items:center;gap:2rem;
  padding:.85rem 1.6rem}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:800;font-size:1.18rem;letter-spacing:-.01em}
.brand .logo{width:32px;height:32px;border-radius:9px;background:var(--accent-grad);
  display:grid;place-items:center;color:#fff;box-shadow:0 4px 14px rgba(109,94,248,.5)}
.nav-links{display:flex;gap:1.7rem;margin-left:1rem;font-size:.95rem;color:#aeb3cc;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:1rem}
.theme-toggle{color:#aeb3cc;font-size:1.1rem;width:38px;height:38px;border-radius:9px;display:grid;place-items:center}
.theme-toggle:hover{color:#fff;background:rgba(255,255,255,.07)}

/* ---------- editor layout ---------- */
.editor{max-width:1480px;margin:0 auto;display:grid;
  grid-template-columns:248px 1fr 320px;gap:1.25rem;padding:1.4rem 1.6rem 2.5rem}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow)}
.panel-pad{padding:1.1rem}
.panel-title{font-size:.82rem;font-weight:700;text-transform:none;color:var(--ink);
  margin:0 0 .9rem;letter-spacing:.01em}

/* effect list (left) */
.fx-list{display:flex;flex-direction:column;gap:.35rem}
.fx-item{display:flex;align-items:center;gap:.75rem;padding:.62rem .8rem;border-radius:10px;
  color:var(--ink-2);font-weight:600;font-size:.92rem;transition:all .15s ease;text-align:left;width:100%}
.fx-item i{width:20px;text-align:center;color:var(--accent);font-size:.95rem}
.fx-item:hover{background:var(--surface-2)}
.fx-item.active{background:var(--accent-grad);color:#fff;box-shadow:0 6px 16px rgba(109,94,248,.35)}
.fx-item.active i{color:#fff}

/* center column */
.stage-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1.2rem}
.stage-title{display:flex;align-items:center;gap:.7rem}
.stage-title .badge-icon{width:34px;height:34px;border-radius:9px;background:var(--accent-soft);
  color:var(--accent);display:grid;place-items:center;font-size:1.05rem}
.stage-title h1{margin:0;font-size:1.6rem;font-weight:800;letter-spacing:-.02em}
.stage-title p{margin:.15rem 0 0;color:var(--muted);font-size:.92rem}

.preview-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem;margin-bottom:1.4rem}
.vid-label{display:flex;align-items:center;gap:.55rem;justify-content:center;font-weight:700;
  font-size:.92rem;margin-bottom:.65rem}
.tag{font-size:.62rem;font-weight:800;letter-spacing:.06em;color:#fff;background:var(--accent-grad);
  padding:.2rem .45rem;border-radius:5px}
.video-frame{position:relative;background:#0c0e18;border-radius:12px;overflow:hidden;aspect-ratio:4/3;
  border:1px solid var(--border)}
.video-frame video{width:100%;height:100%;object-fit:cover}
.video-frame .placeholder{position:absolute;inset:0;display:grid;place-items:center;color:#6b7088;
  font-size:.9rem;text-align:center;padding:1rem;gap:.5rem;flex-direction:column}
.video-frame .placeholder i{font-size:2rem;opacity:.6}
.fx-decor{position:absolute;top:14px;font:800 1.4rem/1 var(--font);color:rgba(255,255,255,.65);letter-spacing:.1em}
.fx-decor.l{left:16px}.fx-decor.r{right:16px}

/* timeline */
.timeline-wrap{margin-bottom:1.4rem}
.timeline-head{font-weight:700;font-size:.9rem;margin-bottom:.7rem}
.filmstrip{display:flex;border-radius:10px;overflow:hidden;border:1px solid var(--border);height:96px}
.filmstrip .frame{flex:1;background-size:cover;background-position:center;border-right:1px solid rgba(255,255,255,.5)}
.filmstrip .frame.rev{filter:grayscale(1)}
.scrub{display:flex;align-items:center;gap:1rem;margin-top:.65rem;font-size:.85rem;color:var(--accent);font-weight:600}
.scrub .track{flex:1;height:2px;background:var(--accent);position:relative;border-radius:2px}
.scrub .track::before,.scrub .track::after{content:"";position:absolute;top:50%;width:8px;height:8px;
  border-top:2px solid var(--accent);border-right:2px solid var(--accent)}
.scrub .track::before{left:0;transform:translateY(-50%) rotate(-135deg)}
.scrub .track::after{right:0;transform:translateY(-50%) rotate(45deg)}
.scrub .knob{position:absolute;left:50%;top:50%;width:14px;height:14px;border-radius:50%;
  background:var(--accent);transform:translate(-50%,-50%);box-shadow:0 2px 6px rgba(109,94,248,.5)}

/* drop zone */
.dropzone{border:2px dashed var(--border-strong);border-radius:var(--radius);padding:2.4rem 1rem;
  text-align:center;background:var(--surface-2);transition:all .2s ease}
.dropzone.drag{border-color:var(--accent);background:var(--accent-soft)}
.dropzone .dz-icon{font-size:2rem;color:var(--accent);margin-bottom:.6rem}
.dropzone h3{margin:0 0 .2rem;font-size:1.25rem;font-weight:800}
.dropzone .or{color:var(--muted);margin:.2rem 0 .9rem;font-size:.9rem}
.dropzone .hint{color:var(--muted);font-size:.82rem;margin-top:.8rem}
.progress{height:8px;background:var(--border);border-radius:6px;overflow:hidden;margin-top:1rem;display:none}
.progress.show{display:block}
.progress .bar{height:100%;width:0;background:var(--accent-grad);transition:width .2s ease}
.progress-meta{display:flex;justify-content:space-between;font-size:.8rem;color:var(--muted);margin-top:.4rem}

/* right sidebar groups */
.side-group{margin-bottom:1.1rem}
.chip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.55rem}
.chip-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.chip-grid.cols-5{grid-template-columns:repeat(5,1fr)}
.chip{border:1px solid var(--border);border-radius:10px;padding:.7rem .3rem;text-align:center;
  background:var(--surface);transition:all .15s ease;font-size:.72rem;font-weight:600;color:var(--ink-2)}
.chip i{display:block;font-size:1.05rem;margin-bottom:.4rem;color:var(--accent)}
.chip:hover{border-color:var(--accent);box-shadow:0 4px 12px rgba(109,94,248,.14)}
.chip.active{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.chip.sel{outline:2px solid var(--accent);outline-offset:-1px}
.chip.heart i{color:var(--pink)} .chip.fire i{color:var(--orange)}
.chip.rain i{color:var(--blue)} .chip.snow i{color:var(--cyan)}
.chip.leak i{color:var(--amber)} .chip.rgb i{font-style:normal}
.side-actions{display:grid;grid-template-columns:1fr 1.4fr;gap:.6rem;margin-top:.4rem}

/* homepage */
.hero{max-width:1100px;margin:0 auto;padding:5rem 1.6rem 3rem;text-align:center}
.hero .eyebrow{display:inline-flex;align-items:center;gap:.5rem;background:var(--accent-soft);
  color:var(--accent);padding:.4rem .9rem;border-radius:999px;font-size:.82rem;font-weight:700;margin-bottom:1.4rem}
.hero h1{font-size:clamp(2.4rem,5vw,3.8rem);font-weight:900;letter-spacing:-.03em;margin:0 0 1rem;line-height:1.05}
.hero h1 .grad{background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:1.15rem;color:var(--ink-2);max-width:620px;margin:0 auto 2rem}
.hero-cta{display:flex;gap:.9rem;justify-content:center;flex-wrap:wrap}
.formats{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;margin-top:1.6rem}
.formats span{font-size:.74rem;font-weight:700;color:var(--muted);border:1px solid var(--border);
  padding:.3rem .7rem;border-radius:7px;background:var(--surface)}

.section{max-width:1180px;margin:0 auto;padding:3rem 1.6rem}
.section h2{text-align:center;font-size:2rem;font-weight:900;letter-spacing:-.02em;margin:0 0 .5rem}
.section .sub{text-align:center;color:var(--muted);margin:0 auto 2.4rem;max-width:560px}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.1rem}
.feature{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.4rem;box-shadow:var(--shadow)}
.feature .ico{width:46px;height:46px;border-radius:12px;background:var(--accent-soft);color:var(--accent);
  display:grid;place-items:center;font-size:1.2rem;margin-bottom:.9rem}
.feature h3{margin:0 0 .35rem;font-size:1.08rem;font-weight:700}
.feature p{margin:0;color:var(--ink-2);font-size:.92rem}

.faq{max-width:780px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:12px;background:var(--surface);margin-bottom:.7rem;overflow:hidden}
.faq-item summary{padding:1.1rem 1.2rem;font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary i{color:var(--accent);transition:transform .2s}
.faq-item[open] summary i{transform:rotate(45deg)}
.faq-item p{padding:0 1.2rem 1.2rem;margin:0;color:var(--ink-2)}

/* footer */
.footer{border-top:1px solid var(--border);margin-top:2rem}
.footer-inner{max-width:1480px;margin:0 auto;padding:1.3rem 1.6rem;display:flex;
  justify-content:space-between;align-items:center;color:var(--muted);font-size:.85rem;flex-wrap:wrap;gap:1rem}
.footer-inner .links{display:flex;gap:1.4rem}
.footer-inner a:hover{color:var(--accent)}

/* toast */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:#fff;padding:.8rem 1.2rem;border-radius:10px;font-size:.9rem;
  box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:all .25s ease;z-index:100;max-width:90vw}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{background:#dc2626}

/* spinner */
.spin{display:inline-block;width:15px;height:15px;border:2px solid rgba(255,255,255,.4);
  border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .editor{grid-template-columns:220px 1fr;}
  .side-col{grid-column:1/-1;order:3}
  .side-col .chip-grid{grid-template-columns:repeat(6,1fr)}
}
@media (max-width:820px){
  .editor{grid-template-columns:1fr}
  .left-col{order:2}.side-col{order:3}
  .preview-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .side-col .chip-grid{grid-template-columns:repeat(3,1fr)}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}