:root {
  color-scheme: light;
  --font-family:
    "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
    sans-serif;
  --color-bg: #f8faff;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5ff;
  --color-border: #e5e7eb;
  --color-text: #111827;
  --color-text-muted: #475569;
  --color-primary: #60a5fa;
  --color-primary-hover: #3b82f6;
  --color-accent: #22d3ee;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --shadow-soft: 0 18px 45px rgba(59, 130, 246, 0.12);
  --shadow-card: 0 18px 40px rgba(15, 23, 42, 0.08);
  --radius-lg: 20px;
  --radius-md: 16px;
  --max-text-width: 75ch;
  line-height: 1.6;
  font-family: var(--font-family);
}

:root.theme-dark,
body.theme-dark {
  color-scheme: dark;
  --color-bg: #020617;
  --color-surface: #0f172a;
  --color-surface-alt: #111c34;
  --color-border: rgba(148, 163, 184, 0.4);
  --color-text: #f8fafc;
  --color-text-muted: #cbd5f5;
  --shadow-soft: 0 18px 45px rgba(8, 145, 178, 0.24);
  --shadow-card: 0 18px 35px rgba(8, 47, 73, 0.32);
}

@media (prefers-color-scheme: dark) {
  :root:not(.theme-light),
  body:not(.theme-light) {
    color-scheme: dark;
    --color-bg: #020617;
    --color-surface: #0f172a;
    --color-surface-alt: #111c34;
    --color-border: rgba(148, 163, 184, 0.4);
    --color-text: #f8fafc;
    --color-text-muted: #cbd5f5;
    --shadow-soft: 0 18px 45px rgba(8, 145, 178, 0.24);
    --shadow-card: 0 18px 35px rgba(8, 47, 73, 0.32);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(
      circle at top right,
      rgba(96, 165, 250, 0.18),
      transparent 45%
    ),
    radial-gradient(
      circle at bottom left,
      rgba(34, 211, 238, 0.22),
      transparent 60%
    ),
    var(--color-bg);
  color: var(--color-text);
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 6px;
}

img {
  max-width: 100%;
  display: block;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 6vw, 4rem);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 250, 255, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.3s ease;
}

body.theme-dark .site-header,
body:not(.theme-light).theme-dark .site-header {
  background: rgba(15, 23, 42, 0.88);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem clamp(1rem, 5vw, 2.5rem);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.site-header__logo img {
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 8px 18px rgba(59, 130, 246, 0.25));
}

.site-header__logo-text {
  font-size: 1rem;
}

.site-header__nav {
  display: inline-flex;
  gap: 1.25rem;
  justify-self: center;
  font-size: 0.92rem;
}

.site-header__nav a {
  font-weight: 500;
}

.site-header__nav a:hover {
  color: var(--color-primary-hover);
}

.site-header__actions {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.65rem;
  justify-self: end;
}

.site-header__controls {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-header__lang {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.site-header__lang label {
  font-weight: 600;
}

.site-header__lang select {
  appearance: none;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.9rem;
  background: var(--color-surface);
  color: var(--color-text);
}

body.theme-dark .site-header__lang select {
  background: var(--color-surface);
  color: var(--color-text);
}

.site-header__cta {
  border-radius: 999px;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-accent)
  );
  color: #ffffff;
  font-weight: 600;
  padding: 0.65rem 1.5rem;
  box-shadow: var(--shadow-soft);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease;
}

.site-header__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(59, 130, 246, 0.25);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.hero {
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 6vw, 3rem)
    clamp(2.5rem, 6vw, 3.5rem);
}

.hero__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.hero__copy h1 {
  font-size: clamp(2.5rem, 5vw, 3rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.hero__copy p {
  margin: 0 0 0.85rem;
  max-width: 68ch;
}

.hero__subhead {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--color-text-muted);
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-secondary {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.6rem 1.5rem;
  font-weight: 600;
  background: transparent;
  color: var(--color-text);
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-hover);
}

.dropzone-wrapper {
  position: relative;
}

.dropzone-illustration {
  position: absolute;
  top: -20px;
  left: 26px;
  width: 56px;
  height: 56px;
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.3),
    rgba(34, 211, 238, 0.45)
  );
  border-radius: 16px;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-soft);
}

.dropzone-illustration svg {
  width: 28px;
  height: 28px;
}

.dropzone {
  margin-top: 1.5rem;
  display: grid;
  justify-items: center;
  text-align: center;
  gap: 0.65rem;
  padding: clamp(2rem, 6vw, 3.5rem);
  border-radius: var(--radius-lg);
  border: 2px dashed rgba(148, 163, 184, 0.45);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  transition:
    border-color 0.2s ease,
    transform 0.2s ease;
  cursor: pointer;
}

.dropzone.is-active {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.dropzone__headline {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

.dropzone__meta,
.dropzone__note {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.dropzone__cta {
  margin-top: 0.4rem;
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.6rem;
  font-weight: 600;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-accent)
  );
  color: #ffffff;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
}

.dropzone__trust {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.12);
  color: var(--color-success);
  font-size: 0.9rem;
}

.dropzone__shield {
  width: 1.2rem;
  height: 1.2rem;
  display: inline-flex;
  background: linear-gradient(135deg, var(--color-success), #15803d);
  mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="white" d="M12 2l7 3v5c0 5-3.55 9.74-7 12-3.45-2.26-7-7-7-12V5l7-3zm0 4.12L8 7.37v2.63c0 3.15 1.97 6.58 4 8.46 2.03-1.88 4-5.31 4-8.46V7.37l-4-1.25zm0 2.38a2.5 2.5 0 110 5 2.5 2.5 0 010-5z"/></svg>')
    center / contain no-repeat;
}

.dropzone__input {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
}

.converter {
  background: var(--color-surface-alt);
  padding: clamp(2.8rem, 7vw, 4.2rem) clamp(1rem, 7vw, 4rem);
}

.converter__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: clamp(1.5rem, 4vw, 2rem);
}

.toolbar {
  display: grid;
  gap: 1.2rem;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.toolbar fieldset {
  margin: 0;
  border: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  font-size: 0.95rem;
}

.toolbar legend {
  font-weight: 600;
  margin-right: 0.5rem;
}

.toolbar__note {
  color: var(--color-text-muted);
}

.toolbar__size-input input {
  width: 128px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.9rem;
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.toolbar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: flex-end;
}

.toolbar__actions button {
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.6rem;
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-accent)
  );
  color: #ffffff;
  box-shadow: var(--shadow-soft);
  transition:
    transform 0.16s ease,
    box-shadow 0.16s ease,
    opacity 0.16s ease;
}

.toolbar__actions button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.toolbar__actions button:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 40px rgba(59, 130, 246, 0.22);
}

.progress {
  display: none;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background: rgba(96, 165, 250, 0.15);
  border: 1px solid rgba(96, 165, 250, 0.35);
  color: var(--color-text);
}

.progress[aria-hidden="false"] {
  display: inline-flex;
}

.progress__bar {
  width: 160px;
  height: 6px;
  border-radius: 999px;
  background: rgba(96, 165, 250, 0.25);
  overflow: hidden;
}

.progress__bar span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-accent)
  );
  transition: width 0.3s ease;
}

.preview {
  display: grid;
  gap: 1.5rem;
}

.preview-empty {
  display: grid;
  gap: 0.85rem;
  justify-items: center;
  text-align: center;
  padding: 4rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(148, 163, 184, 0.4);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  color: var(--color-text-muted);
}

.preview-empty__illustration {
  width: 180px;
  height: 120px;
  border-radius: 24px;
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.25),
    rgba(34, 211, 238, 0.35)
  );
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-soft);
}

.preview-empty__illustration svg {
  width: 62px;
  height: 62px;
  color: #ffffff;
}

.preview-empty__headline {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
}

.preview-empty__body {
  margin: 0;
  max-width: 32rem;
}

.preview-empty__links {
  display: inline-flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.preview-empty__links a {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.45rem 1.1rem;
  font-weight: 500;
  background: var(--color-surface-alt);
}

.preview-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.preview-card {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.2rem;
  padding: 1.4rem;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.preview-card canvas,
.preview-card img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: var(--color-surface-alt);
}

.preview-card__meta {
  display: grid;
  gap: 0.9rem;
}

.preview-card__meta h3 {
  margin: 0;
  font-size: 1rem;
}

.preview-card__details,
.preview-card__tech {
  display: grid;
  gap: 0.5rem;
  margin: 0;
}

.preview-card__details {
  font-size: 0.92rem;
}

.preview-card__tech {
  margin-top: -0.2rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}
.preview-card__details dt,
.preview-card__tech dt {
  font-weight: 600;
  color: var(--color-text);
}

.preview-card__tech dt {
  font-weight: 500;
  color: var(--color-text-muted);
}

.preview-card__details dd,
.preview-card__tech dd {
  margin: 0;
  color: var(--color-text-muted);
}

.preview-card__warnings {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--color-warning);
  font-size: 0.85rem;
}

.preview-card__warnings li {
  margin: 0.15rem 0;
}

.preview-card__actions {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-wrap: wrap;
}

.preview-card__action {
  border: none;
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: linear-gradient(
    135deg,
    var(--color-primary),
    var(--color-accent)
  );
  color: #ffffff;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
}

.preview-card__action:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.preview-card__remove {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
}

.preview-card__remove:hover {
  color: var(--color-warning);
  border-color: var(--color-warning);
}

.preview-card__remove:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.preview-card__status {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.process {
  background: var(--color-surface);
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 7vw, 4rem);
}

.process__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: clamp(2.5rem, 5vw, 3.5rem);
}

.process__block {
  max-width: var(--max-text-width);
}

.process__block h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 1rem;
}

.process__block p {
  margin: 0 0 1rem;
}

.process__links {
  font-weight: 500;
}

.process__links a {
  font-weight: 600;
}

.process__block ol,
.process__block ul {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
  display: grid;
  gap: 0.65rem;
}

.process__table {
  display: grid;
  gap: 0.6rem;
}

.process__row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.6rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
}

.process__row:first-child {
  font-weight: 600;
  background: rgba(96, 165, 250, 0.12);
}

#faq details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.2rem;
  background: var(--color-surface-alt);
}

#faq summary {
  font-weight: 600;
  cursor: pointer;
}

.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 2.2rem clamp(1rem, 7vw, 4rem);
}

body.theme-dark .site-footer,
body:not(.theme-light).theme-dark .site-footer {
  background: #050a14;
}

.site-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.site-footer nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-footer nav a:hover {
  color: var(--color-primary-hover);
}

.toast {
  position: fixed;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 0.85rem 1.4rem;
  border-radius: 999px;
  border: 1px solid rgba(34, 197, 94, 0.35);
  box-shadow: var(--shadow-card);
}

.theme-dark .toast {
  border-color: rgba(34, 211, 238, 0.45);
}

.toast[hidden] {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 960px) {
  .site-header__inner {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 0.75rem;
  }

  .site-header__nav {
    order: 3;
    flex-wrap: wrap;
    justify-content: center;
  }

  .site-header__actions {
    order: 2;
    width: 100%;
    align-items: center;
  }

  .site-header__cta {
    width: 100%;
    text-align: center;
  }

  .site-header__controls {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .site-header__controls {
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
  }

  .site-header__lang {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
  }

  .site-header__lang label {
    font-size: 0.78rem;
  }

  .site-header__lang select {
    width: 100%;
  }

  .preview-card {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}