:root {
  --primary: #727cf5;
  --primary-dark: #626de6;
  --ink: #282f3a;
  --muted: #7f8795;
  --soft: #efeef3;
  --line: #bec0da;
  --success: #28a76f;
  --danger: #df5362;
}

* { box-sizing: border-box; }
html { min-width: 320px; }
body { min-height: 100vh; margin: 0; display: flex; flex-direction: column; color: var(--ink); background: #fff; font: 400 16px/1.45 "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button { font: inherit; }
button, [role="button"] { -webkit-tap-highlight-color: transparent; }
button:focus-visible, [role="button"]:focus-visible { outline: 3px solid rgba(114, 124, 245, .28); outline-offset: 3px; }
.is-hidden, .hidden-defaults { display: none !important; }
.visually-hidden { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }

.topbar { position: sticky; top: 0; z-index: 30; border-bottom: 1px solid #e7e8ee; background: rgba(255,255,255,.96); box-shadow: 0 3px 14px rgba(40,47,58,.05); backdrop-filter: blur(10px); }
.topbar-inner { width: min(1021px, 100%); height: 64px; margin: 0 auto; padding: 0 37px; display: flex; align-items: center; }
.samio-brand { width: fit-content; display: inline-flex; align-items: center; border-radius: 6px; }
.samio-brand img { width: 126px; height: auto; display: block; }

.converter-page { width: min(1021px, 100%); flex: 1; margin: 0 auto; padding: 32px 37px 24px; }
.converter-heading { text-align: center; }
.converter-heading h1 { margin: 0; color: var(--ink); font-size: clamp(2.3rem, 5.7vw, 3.65rem); line-height: 1.15; font-weight: 800; letter-spacing: -.045em; }
.converter-heading p { margin: 20px 0 0; color: var(--ink); font-size: clamp(1rem, 2.25vw, 1.42rem); line-height: 1.4; }

.drop-zone { min-height: 344px; margin-top: 64px; padding: 42px 24px; display: grid; place-items: center; color: var(--ink); background: var(--soft); border: 3px dashed var(--line); border-radius: 6px; outline: none; transition: border-color .18s, background .18s; }
.drop-zone:hover, .drop-zone:focus-visible, .drop-zone.is-dragging { background: #ececf4; border-color: var(--primary); }
.chooser-wrap { display: grid; justify-items: center; text-align: center; transform: translateY(-10px); }
.split-button { position: relative; display: flex; border-radius: 6px; box-shadow: 0 18px 28px rgba(75, 83, 180, .2); }
.choose-button, .source-menu-toggle { height: 74px; color: #fff; background: var(--primary); border: 0; cursor: pointer; }
.choose-button:hover, .source-menu-toggle:hover { background: var(--primary-dark); }
.choose-button { width: 238px; min-width: 238px; padding: 0 12px; display: flex; align-items: center; justify-content: center; gap: 10px; border-radius: 6px 0 0 6px; font-size: 1.45rem; font-weight: 700; white-space: nowrap; }
.choose-button i { font-size: 1.45rem; }
.source-menu-toggle { width: 76px; display: grid; place-items: center; border-left: 1px solid rgba(255,255,255,.35); border-radius: 0 6px 6px 0; font-size: 1.15rem; }
.source-menu-toggle[aria-expanded="true"] i { transform: rotate(180deg); }
.source-menu { position: absolute; top: calc(100% + 10px); right: 0; z-index: 10; width: 280px; padding: 7px; visibility: hidden; background: #fff; border: 1px solid #e2e3eb; border-radius: 8px; box-shadow: 0 14px 38px rgba(40,47,58,.18); opacity: 0; transform: translateY(-5px); transition: .16s ease; }
.source-menu.is-open { visibility: visible; opacity: 1; transform: translateY(0); }
.source-menu button { width: 100%; min-height: 58px; padding: 8px 10px; display: flex; align-items: center; gap: 12px; color: var(--ink); background: transparent; border: 0; border-radius: 6px; text-align: left; cursor: pointer; }
.source-menu button:hover { background: #f1f2fc; }
.source-menu button > i { width: 30px; color: var(--primary); font-size: 1.2rem; text-align: center; }
.source-menu button span { display: grid; gap: 2px; }
.source-menu b { font-size: .86rem; }
.source-menu small { color: var(--muted); font-size: .72rem; }
.size-note { margin: 14px 0 0; font-size: 1rem; }
.privacy-note { margin: 12px 0 0; color: #7d8aa8; font-size: .86rem; }
.privacy-note i { margin-right: 5px; color: var(--primary); }

.source-summary { width: min(610px, 100%); padding: 18px; background: rgba(255,255,255,.72); border: 1px solid #dfe0e9; border-radius: 10px; box-shadow: 0 12px 32px rgba(57, 61, 96, .09); }
.source-file { display: flex; align-items: center; gap: 13px; text-align: left; }
.source-file-icon { width: 48px; height: 48px; flex: 0 0 auto; display: grid; place-items: center; color: var(--primary); background: #e7e9ff; border-radius: 8px; font-size: 1.25rem; }
.source-file-copy { min-width: 0; flex: 1; }
.source-file-copy strong, .source-file-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.source-file-copy strong { font-size: .94rem; }
.source-file-copy small { margin-top: 3px; color: var(--muted); font-size: .76rem; }
.clear-button { width: 44px; height: 44px; flex: 0 0 auto; color: var(--muted); background: transparent; border: 0; border-radius: 50%; cursor: pointer; }
.clear-button:hover { color: var(--danger); background: #fff0f2; }
.source-facts { margin: 14px 0; padding: 9px 12px; display: flex; justify-content: center; flex-wrap: wrap; gap: 8px 18px; color: var(--muted); background: #f5f5f8; border-radius: 6px; font-size: .75rem; }
.source-facts b { color: var(--ink); font-weight: 600; }
.output-row { padding-top: 15px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-top: 1px solid #e0e1e8; }
.output-copy { min-width: 0; display: flex; align-items: center; gap: 10px; text-align: left; }
.ready-icon { color: var(--success); font-size: 1.2rem; }
.output-copy div { min-width: 0; }
.output-copy strong, .output-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.output-copy strong { font-size: .83rem; }
.output-copy small { margin-top: 2px; color: var(--muted); font-size: .7rem; }
.download-button { min-height: 46px; padding: 0 17px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; color: #fff; background: var(--primary); border: 0; border-radius: 6px; font-size: .8rem; font-weight: 600; cursor: pointer; box-shadow: 0 8px 18px rgba(75, 83, 180, .2); }
.download-button:hover { background: var(--primary-dark); }
.download-button:disabled { color: #9da1af; background: #e3e3e9; box-shadow: none; cursor: not-allowed; }
.progress-wrap { margin-top: 14px; }
.progress-track { height: 6px; overflow: hidden; background: #dfe0e7; border-radius: 20px; }
.progress-track span { width: 0; height: 100%; display: block; background: var(--primary); border-radius: inherit; transition: width .15s; }
.progress-wrap small { display: block; margin-top: 6px; color: var(--muted); font-size: .72rem; text-align: left; }

.company-footer { border-top: 1px solid #e6e7ee; color: #656b78; background: #fafafd; }
.company-footer-inner { width: min(1021px, 100%); margin: 0 auto; padding: 22px 37px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px 48px; font-size: 13px; line-height: 1.65; }
.company-identity, .company-details { display: grid; align-content: start; gap: 2px; }
.company-identity strong { color: var(--ink); font-size: 14px; font-weight: 700; }
.company-details b { color: #4d5360; font-weight: 600; }
.company-details a { width: fit-content; color: inherit; text-decoration: none; transition: color .16s ease; }
.company-details a:hover, .company-details a:focus-visible { color: var(--primary); text-decoration: underline; }

.toast { position: fixed; right: 20px; bottom: 20px; z-index: 50; max-width: min(380px, calc(100vw - 40px)); padding: 12px 16px; color: #fff; background: var(--ink); border-radius: 7px; box-shadow: 0 14px 36px rgba(0,0,0,.22); opacity: 0; transform: translateY(12px); pointer-events: none; transition: .2s; }
.toast.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 640px) {
  .topbar-inner { height: 56px; padding-inline: 16px; }
  .samio-brand img { width: 112px; }
  .converter-page { padding: 28px 16px; }
  .company-footer-inner { padding: 20px 16px 24px; grid-template-columns: 1fr; gap: 14px; font-size: 12.5px; }
  .company-details a { max-width: 100%; overflow-wrap: anywhere; }
  .converter-heading h1 { font-size: clamp(2.1rem, 10vw, 3rem); }
  .converter-heading p { margin-top: 14px; font-size: .98rem; }
  .drop-zone { min-height: 330px; margin-top: 42px; padding: 32px 14px; }
  .chooser-wrap { transform: none; }
  .choose-button, .source-menu-toggle { height: 62px; }
  .choose-button { width: auto; min-width: 0; padding: 0 18px; font-size: 1.18rem; }
  .choose-button i { font-size: 1.25rem; }
  .source-menu-toggle { width: 58px; }
  .source-menu { width: min(280px, calc(100vw - 62px)); }
  .size-note { font-size: .86rem; }
  .privacy-note { max-width: 280px; font-size: .75rem; }
  .source-summary { padding: 14px; }
  .output-row { align-items: stretch; flex-direction: column; }
  .download-button { width: 100%; min-height: 48px; }
}

@media (max-width: 390px) {
  .topbar-inner { padding-inline: 12px; }
  .converter-page { padding-inline: 12px; }
  .company-footer-inner { padding-inline: 12px; }
  .drop-zone { padding-inline: 10px; border-width: 2px; }
  .choose-button { padding-inline: 14px; font-size: 1.05rem; }
  .source-menu-toggle { width: 52px; }
  .source-facts { gap: 6px 12px; }
}

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