:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#101c35;background:#f7f9fd;font-synthesis:none;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;background:radial-gradient(ellipse 68% 33% at 50% 0%,#ecf2ff 0%,transparent 96%),#f7f9fd}
button,input{font:inherit}button{cursor:pointer}.hidden{display:none!important}
.app-shell{max-width:1160px;padding:0 28px;margin:0 auto}
.header{height:94px;display:flex;align-items:center;justify-content:space-between;gap:15px;border-bottom:1px solid #e9edf5}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:16px;letter-spacing:-.45px}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;color:#fff;background:linear-gradient(135deg,#3977f1,#2455e5);box-shadow:0 6px 17px #3977f12b}
.header-side{display:flex;align-items:center;gap:8px;padding:8px 13px;border:1px solid #e4ebf5;border-radius:20px;background:#fff;color:#66768f;font-size:12px;font-weight:600}
.online-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#13a76c;flex:none}
.main{max-width:860px;margin:0 auto;padding-bottom:70px}
.hero{text-align:center;margin:75px 0 34px}.eyebrow{display:inline-flex;align-items:center;gap:9px;color:#3269e4;font-size:11px;letter-spacing:2px;font-weight:800}.eyebrow-line{height:2px;width:19px;background:#3269e4;border-radius:2px}
h1{font-size:clamp(42px,6vw,64px);font-weight:850;line-height:1.10;letter-spacing:-3.5px;margin:16px 0 17px}h1 span{color:#3269e4}
.intro{margin:0 auto;max-width:555px;color:#6b7b94;font-size:15px;line-height:1.8}
.panel{border:1px solid #e5eaf3;background:#fff;padding:24px;border-radius:20px;box-shadow:0 20px 60px #1b31520b,0 4px 12px #1b315205}
.field-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:10px}.field-label label{font-size:14px;font-weight:750}.step-text{font-size:10px;letter-spacing:1.25px;font-weight:850;color:#9ba8bd}
.input-line{display:flex;gap:10px;align-items:stretch}.input-wrap{flex:1;min-width:0;display:flex;align-items:center;border-radius:11px;border:1px solid #dfe7f3;padding:0 8px 0 16px;color:#8594aa;transition:border-color .15s,box-shadow .15s}.input-wrap:focus-within{border-color:#3269e4;box-shadow:0 0 0 3px #3269e417}
#videoUrl{height:56px;min-width:0;width:100%;outline:0;border:0;background:transparent;color:#13233f;font-size:14px;padding:0 12px}#videoUrl::placeholder{color:#a6b0c3}
.paste-button{background:#f0f4fa;color:#5c6c85;border:1px solid #e6edf7;border-radius:7px;padding:8px 12px;font-size:12px;font-weight:750}.paste-button:hover{background:#e9eef8}.paste-button:focus-visible,.fetch-button:focus-visible,.download-button:focus-visible{outline:3px solid #a7c0ff;outline-offset:2px}
.fetch-button,.download-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;white-space:nowrap;color:#fff;background:#2863ea;border:0;border-radius:11px;font-size:14px;font-weight:800;padding:0 23px;min-height:56px;box-shadow:0 5px 12px #2863ea27;transition:background .15s,transform .15s}.fetch-button:hover,.download-button:hover{background:#164ed7}.fetch-button:active,.download-button:active{transform:translateY(1px)}.fetch-button:disabled{opacity:.65;cursor:wait;transform:none}
.message{font-size:12px;line-height:1.5;color:#557096;margin:12px 2px 0}.message:empty{display:none}.message.error{color:#c43846}.message.ok{color:#138359}
.preview{border-top:1px solid #ebeff6;margin-top:23px;padding-top:23px;animation:appear .2s ease both}@keyframes appear{from{opacity:.7;transform:translateY(4px)}to{opacity:1;transform:none}}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}.section-heading h2{font-size:19px;letter-spacing:-.55px;margin:5px 0 0}.ready-badge{font-weight:750;color:#13865b;background:#e9f9f1;padding:8px 11px;font-size:11px;border-radius:30px;display:inline-flex;align-items:center;gap:7px}
.video-info{display:flex;align-items:center;gap:18px;border:1px solid #eef1f7;background:#fbfcfe;border-radius:13px;padding:12px}
.thumbnail-wrap{width:174px;aspect-ratio:16/9;border-radius:9px;overflow:hidden;background:linear-gradient(140deg,#d9e5fa,#edf2fa);position:relative;flex:none;display:grid;place-items:center;color:#8ba4d4}
.thumbnail-wrap img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;z-index:1}.thumbnail-wrap img.hidden{display:none!important}
.video-copy{min-width:0;flex:1}.platform{font-size:11px;text-transform:uppercase;letter-spacing:1px;font-weight:800;color:#2863ea;margin:0 0 7px}.video-copy h3{font-size:15px;line-height:1.5;letter-spacing:-.2px;overflow-wrap:anywhere;margin:0 0 7px;font-weight:750;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.duration{font-size:12px;color:#8090a8;margin:0}
.preview-actions{border-top:1px solid #ecf0f6;display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:21px;padding-top:20px}.download-copy{display:flex;flex-direction:column;gap:5px;min-width:0}.download-copy strong{font-size:13px}.download-copy span{font-size:12px;line-height:1.55;color:#7687a1}.download-button{text-decoration:none;min-width:205px;min-height:50px}.download-button[aria-disabled="true"]{opacity:.5;pointer-events:none}.download-help{text-align:right;margin:10px 0 0;font-size:11px;color:#9aa7b8;line-height:1.5}
.below{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin:20px 4px 0}.hint{display:flex;align-items:flex-start;gap:8px;font-size:12px;line-height:1.6;color:#7a8ba3;max-width:510px}.hint svg{flex-shrink:0;margin-top:1px}.settings{flex-shrink:0;font-size:12px;color:#5374b3}.settings summary{cursor:pointer;text-align:right;list-style:revert;font-weight:700}.settings-inner{position:relative;z-index:2;background:#fff;border:1px solid #e5eaf3;border-radius:12px;padding:13px;margin-top:12px;max-width:300px;box-shadow:0 12px 32px #17305a10}.settings-inner label{display:block;font-weight:700;margin-bottom:7px;color:#394b66}.settings-inner input{width:100%;border:1px solid #dce6f3;border-radius:8px;padding:10px;min-width:0}.settings-inner p{margin:8px 0 0;color:#8795aa;line-height:1.5}.disclaimer{text-align:center;color:#9ba7b8;font-size:11px;line-height:1.6;max-width:650px;margin:37px auto 0}
@media(max-width:700px){.app-shell{padding:0 16px}.header{height:74px}.main{padding-bottom:40px}.hero{margin:57px 0 27px}h1{font-size:clamp(36px,8.5vw,52px);letter-spacing:-2.5px}.intro{font-size:14px}.panel{padding:17px;border-radius:16px}.input-line{flex-direction:column}.fetch-button{width:100%;min-height:52px}.video-info{gap:12px}.thumbnail-wrap{width:120px}.preview-actions{align-items:stretch;flex-direction:column}.download-button{width:100%}.download-help{text-align:center}.below{flex-direction:column}.settings summary{text-align:left}}
@media(max-width:410px){.header-side{font-size:0;gap:0;padding:10px}.header-side .online-dot{width:8px;height:8px}.brand{font-size:14px}.thumbnail-wrap{width:100px}.video-copy h3{font-size:13px}.ready-badge{font-size:10px;padding:7px}.intro{line-height:1.65}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* v1.0.7 — kinetic download button. Motion reflects interaction, not transfer progress. */
.download-button {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  background: linear-gradient(115deg, #265be6 0%, #357bf6 54%, #235ee7 100%);
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: 0 6px 0 #1947b6, 0 12px 23px rgba(35,87,209,.25);
  transform: translateY(0) scale(1);
  transition: transform .21s cubic-bezier(.2,.8,.2,1),
              box-shadow .21s cubic-bezier(.2,.8,.2,1), filter .21s ease;
}
.download-button-body {display:inline-flex;align-items:center;justify-content:center;gap:10px;position:relative;z-index:2;}
.download-icon {display:inline-flex;align-items:center;justify-content:center;transform:translateY(-1px);}
.download-button-glint {position:absolute;z-index:1;inset:0;pointer-events:none;background:linear-gradient(110deg,transparent 23%,rgba(255,255,255,.22) 47%,transparent 68%);transform:translateX(-130%);}
.download-button .button-check {display:none;}
.download-button:not([aria-disabled="true"]):hover {
  background:linear-gradient(115deg,#245be5,#2976fa,#225de9);
  transform:translateY(-3px);
  box-shadow:0 9px 0 #1947b6,0 16px 30px rgba(35,87,209,.28);
}
.download-button:not([aria-disabled="true"]):hover .download-icon {animation:arrow-nudge .75s ease-in-out infinite;}
.download-button:not([aria-disabled="true"]):active,
.download-button.is-pressed {
  transform:translateY(5px) scale(.984);
  box-shadow:0 1px 0 #1947b6,0 4px 10px rgba(35,87,209,.18);
  filter:brightness(.97);
}
.download-button.is-launching {
  transform:translateY(2px) scale(1);
  box-shadow:0 3px 0 #1947b6,0 9px 18px rgba(35,87,209,.19);
  cursor:default;
  background:linear-gradient(115deg,#2460d1,#3274e6);
  opacity:1;
  pointer-events:none;
}
.download-button.is-launching .download-icon {animation:download-drop .72s cubic-bezier(.17,.67,.35,1) both;}
.download-button.is-launching .download-button-glint {animation:button-shine .8s ease-out both;}
.download-button.is-launching .button-check {display:block;animation:check-appear .4s .32s ease both;}
.download-button.is-launching .download-button-body {animation:tiny-press .38s ease both;}
.download-button.is-launching #downloadButtonText {white-space:nowrap;}
@keyframes arrow-nudge {0%,100%{transform:translateY(-1px)}50%{transform:translateY(3px)}}
@keyframes download-drop {0%{transform:translateY(-6px);opacity:.65}42%{transform:translateY(6px);opacity:1}68%{transform:translateY(0)}100%{transform:translateY(0)}}
@keyframes button-shine {0%{transform:translateX(-130%)}100%{transform:translateX(130%)}}
@keyframes check-appear {from{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}
@keyframes tiny-press {0%{transform:scale(.97)}60%{transform:scale(1.025)}100%{transform:scale(1)}}
.download-button[aria-disabled="true"]:not(.is-launching){opacity:.5;box-shadow:none;pointer-events:none;}
@media(max-width:700px){.download-button{min-height:58px;width:100%;} .download-button:not([aria-disabled="true"]):hover{transform:none;} .download-button:not([aria-disabled="true"]):active{transform:translateY(4px) scale(.985);}}
@media(prefers-reduced-motion:reduce){.download-button,.download-icon,.download-button-glint,.download-button-body,.button-check{animation:none!important;transition:none!important;} .download-button.is-launching .button-check{display:block;}}

/* v1.0.8: meaningful pending motion until the actual attachment response starts. */
.download-frame{position:absolute!important;width:1px;height:1px;top:0;left:0;opacity:0;border:0;pointer-events:none}
.download-button .download-spinner{display:none;flex:none;width:20px;height:20px;border:2.6px solid #ffffff65;border-top-color:#fff;border-radius:50%}
.download-button.is-preparing[aria-disabled="true"]{background:linear-gradient(115deg,#245ad4,#367cf8,#2556d3);box-shadow:0 3px 0 #1947b6,0 9px 21px #2863ea36;transform:translateY(2px);pointer-events:none;cursor:wait;opacity:1}
.download-button.is-preparing .download-spinner{display:inline-block;animation:download-spinner-rotate .76s linear infinite}
.download-button.is-preparing .download-icon,.download-button.is-preparing .button-check{display:none}
.download-button.is-preparing .download-button-glint{animation:pending-shine 1.9s linear infinite}
.download-button.is-preparing .download-button-body{animation:pending-breath 1.7s ease-in-out infinite}
.download-button.is-transferring[aria-disabled="true"]{background:linear-gradient(110deg,#159a6a,#168d7d);box-shadow:0 3px 0 #087657,0 7px 17px #168d7d30;pointer-events:none;transform:translateY(2px);opacity:1;cursor:default}
.download-button.is-transferring .download-icon,.download-button.is-transferring .download-spinner{display:none}
.download-button.is-transferring .button-check{display:block;animation:check-appear .25s ease both}
.download-button.is-failed[aria-disabled="true"]{background:#5a6c87;box-shadow:none;pointer-events:none;opacity:1;cursor:default}
.download-button.is-failed .download-spinner,.download-button.is-failed .button-check{display:none}
.download-button.is-failed .download-icon{display:inline-flex}
@keyframes download-spinner-rotate{to{transform:rotate(360deg)}}
@keyframes pending-shine{0%{transform:translateX(-130%)}100%{transform:translateX(130%)}}
@keyframes pending-breath{0%,100%{opacity:1}50%{opacity:.83}}
@media(prefers-reduced-motion:reduce){.download-button.is-preparing .download-spinner,.download-button.is-preparing .download-button-glint,.download-button.is-preparing .download-button-body{animation:none!important}.download-button.is-preparing .download-spinner{border-top-color:transparent}}