:root {
  color-scheme: light dark;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-soft: #f1f5f9;
  --text: #0f172a;
  --muted: #5b6475;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --privacy: #0f766e;
  --privacy-strong: #115e59;
  --privacy-soft: #e6f7f4;
  --privacy-border: rgba(15, 118, 110, 0.35);
  --privacy-ring: rgba(15, 118, 110, 0.16);
  --border: #d9e2ef;
  --error: #b91c1c;
  --ok: #15803d;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --surface: #121a2d;
    --surface-soft: #182238;
    --text: #eef2ff;
    --muted: #a8b3c7;
    --accent: #60a5fa;
    --accent-strong: #93c5fd;
    --privacy: #2dd4bf;
    --privacy-strong: #99f6e4;
    --privacy-soft: rgba(45, 212, 191, 0.12);
    --privacy-border: rgba(45, 212, 191, 0.35);
    --privacy-ring: rgba(45, 212, 191, 0.18);
    --border: #29364f;
    --error: #f87171;
    --ok: #4ade80;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.11), transparent 34rem),
    linear-gradient(180deg, #ffffff 0, var(--bg) 24rem);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

@media (prefers-color-scheme: dark) {
  body {
    background:
      radial-gradient(circle at top left, rgba(45, 212, 191, 0.12), transparent 34rem),
      linear-gradient(180deg, #101827 0, var(--bg) 24rem);
  }
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

.container {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

.hero {
  padding: 1.2rem 0 1.8rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.brand {
  color: var(--privacy-strong);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.topbar-links {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

.source-link {
  color: var(--muted);
  font-weight: 700;
  font-size: 0.92rem;
  text-decoration: none;
}

.source-link:hover {
  color: var(--text);
  text-decoration: underline;
}

.donate,
.file-btn,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  padding: 0.72rem 1rem;
  background: var(--text);
  color: var(--surface);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.14);
}

.file-btn,
button:not([disabled]) {
  background: var(--accent);
  color: #fff;
}

.file-btn:hover,
button:not([disabled]):hover {
  background: var(--accent-strong);
}

button[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(280px, 0.88fr);
  gap: clamp(1.3rem, 4vw, 3rem);
  align-items: start;
}

.badge,
.panel-kicker {
  display: inline-flex;
  width: fit-content;
  margin: 0 0 1rem;
  border: 1px solid var(--privacy-border);
  border-radius: 999px;
  padding: 0.38rem 0.72rem;
  background: var(--privacy-soft);
  color: var(--privacy-strong);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 14ch;
  margin-bottom: 1rem;
  font-size: clamp(2.25rem, 6vw, 4.35rem);
  line-height: 0.95;
  letter-spacing: -0.075em;
}

.lead {
  max-width: 42rem;
  margin-bottom: 1.35rem;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.trust-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.78rem;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
}

@media (prefers-color-scheme: dark) {
  .chip {
    background: rgba(18, 26, 45, 0.72);
  }
}

.privacy-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 1.4rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  background:
    linear-gradient(145deg, var(--surface) 0%, var(--surface-soft) 100%);
  box-shadow: var(--shadow);
}

.hero-art {
  position: relative;
  z-index: 1;
  display: block;
  width: min(100%, 25rem);
  margin: -0.5rem auto 1.2rem;
}

.privacy-panel::after {
  content: "";
  position: absolute;
  inset: auto -25% -45% 20%;
  height: 11rem;
  border-radius: 50%;
  background: var(--privacy-ring);
  filter: blur(18px);
}

.privacy-panel h2 {
  position: relative;
  z-index: 1;
  max-width: 13rem;
  margin-bottom: 1rem;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.privacy-panel p {
  position: relative;
  z-index: 1;
  margin-bottom: 0;
  color: var(--muted);
}

.privacy-flow {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto;
  align-items: center;
  gap: 0.55rem;
  margin: 1.2rem 0;
}

.privacy-flow span:not(.flow-line) {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.55rem 0.7rem;
  background: var(--surface);
  color: var(--privacy-strong);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.flow-line {
  height: 2px;
  background: linear-gradient(90deg, var(--privacy), transparent);
}

main {
  display: grid;
  gap: 1rem;
  align-content: start;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 1.15rem;
  padding: clamp(1rem, 2.5vw, 1.45rem);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.converter {
  border-color: var(--privacy-border);
}

.hero .converter {
  margin-top: 0;
}

.converter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.converter-head h2 {
  margin-bottom: 0;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.local-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 999px;
  padding: 0.38rem 0.72rem;
  background: var(--privacy-soft);
  color: var(--privacy-strong);
  font-size: 0.85rem;
  font-weight: 800;
}

.dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--privacy);
  box-shadow: 0 0 0 5px var(--privacy-ring);
}

.controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(150px, 0.32fr);
  gap: 0.9rem 1rem;
  margin-bottom: 1rem;
}

.control-group {
  display: grid;
  gap: 0.45rem;
}

.control-group label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.quality-control.is-disabled {
  opacity: 0.5;
}

.quality-control.is-disabled input {
  cursor: not-allowed;
}

input[type="range"],
select {
  width: 100%;
}

select {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 0.7rem 0.85rem;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.drop-zone {
  border: 1.5px dashed var(--privacy-border);
  border-radius: 1rem;
  padding: clamp(1.2rem, 4vw, 2rem);
  background:
    linear-gradient(180deg, var(--privacy-soft), transparent);
  text-align: center;
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.drag-over {
  border-color: var(--privacy);
  background-color: var(--privacy-soft);
  outline: none;
  transform: translateY(-1px);
}

.drop-icon {
  display: inline-grid;
  place-items: center;
  width: 3.8rem;
  height: 3.8rem;
  margin: 0 auto 0.8rem;
  border-radius: 1.1rem;
  background: var(--surface);
  color: var(--privacy-strong);
  font-weight: 900;
  letter-spacing: -0.05em;
  box-shadow: inset 0 0 0 1px var(--border);
}

.drop-zone p {
  margin-bottom: 0.35rem;
}

.drop-or {
  color: var(--muted);
  font-size: 0.9rem;
}

.drop-zone .file-btn {
  margin: 0.45rem 0 0.7rem;
}

.drop-privacy {
  color: var(--privacy-strong);
  font-size: 0.9rem;
  font-weight: 700;
}

input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.message {
  min-height: 1.2em;
  margin: 0.8rem 0;
  color: var(--muted);
}

.batch-panel {
  border-color: var(--privacy-border);
}

.batch-head {
  display: flex;
  flex-wrap: wrap;
  align-items: start;
  justify-content: space-between;
  gap: 0.9rem;
  margin-bottom: 0.9rem;
}

.batch-head h2 {
  margin-bottom: 0;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
}

.batch-head .panel-kicker {
  margin-bottom: 0.35rem;
}

.batch-empty {
  border: 1px dashed var(--border);
  border-radius: 0.95rem;
  padding: 1rem;
  background: var(--surface-soft);
  color: var(--muted);
}

.batch-empty strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.batch-empty p {
  margin-bottom: 0;
}

.estimate {
  margin: 0 0 0.8rem;
  border-radius: 0.85rem;
  padding: 0.7rem 0.9rem;
  background: var(--privacy-soft);
  color: var(--privacy-strong);
  font-size: 0.92rem;
  font-weight: 700;
}

.estimate.warn {
  background: rgba(185, 28, 28, 0.08);
  color: var(--error);
}

.batch-tip {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.donate-prompt {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin: 0 0 0.9rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--privacy-border);
  border-radius: 0.95rem;
  background: linear-gradient(115deg, var(--privacy-soft) 0%, var(--surface) 40%, var(--privacy-soft) 80%, var(--surface) 100%);
  background-size: 250% 100%;
  animation:
    donate-in 0.55s cubic-bezier(0.18, 0.9, 0.32, 1.28),
    donate-shimmer 2.6s ease-out 0.55s 1 backwards;
}

.donate-prompt[hidden] {
  display: none;
}

@keyframes donate-in {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes donate-shimmer {
  to { background-position: -250% 0; }
}

.donate-emoji {
  display: inline-block;
  font-size: 2rem;
  transform-origin: 70% 85%;
  animation: donate-wiggle 2.6s ease-in-out 0.6s 2;
}

@keyframes donate-wiggle {
  0%, 30%, 100% { transform: rotate(0); }
  6% { transform: rotate(-9deg); }
  14% { transform: rotate(9deg); }
  22% { transform: rotate(-5deg); }
}

.donate-copy {
  flex: 1;
  min-width: 220px;
  display: grid;
  gap: 0.15rem;
}

.donate-copy span {
  color: var(--muted);
  font-size: 0.92rem;
}

.donate-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
  .donate-prompt,
  .donate-emoji {
    animation: none;
  }
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.results {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.result-item {
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 0.8rem;
  background: var(--surface-soft);
}

.result-top {
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
}

.result-details {
  display: grid;
  min-width: 0;
  gap: 0.15rem;
}

.file-name {
  overflow-wrap: anywhere;
}

.file-size {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.batch-total-size {
  margin: 0.75rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 800;
  text-align: right;
}

.status {
  font-weight: 800;
}

.status.error { color: var(--error); }
.status.done { color: var(--ok); }

.preview {
  max-width: 180px;
  max-height: 180px;
  margin-top: 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  cursor: zoom-in;
}

.preview:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.7rem;
}

button.ghost:not([disabled]) {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  box-shadow: none;
}

button.ghost:not([disabled]):hover {
  background: var(--surface-soft);
  color: var(--text);
}

.privacy-card {
  border-top: 4px solid var(--privacy);
}

.privacy-art {
  display: block;
  width: 100%;
  margin: 0 auto 1.2rem;
}

.privacy-card > p,
.feature p,
.faq p {
  color: var(--muted);
}

.privacy-steps,
.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.privacy-steps {
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.privacy-steps li {
  border: 1px solid var(--border);
  border-radius: 0.95rem;
  padding: 1rem;
  background: var(--surface-soft);
}

.step-num {
  display: inline-grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  background: var(--privacy);
  color: #fff;
  font-weight: 900;
}

.privacy-steps h3,
.feature h3 {
  margin: 0.65rem 0 0.25rem;
}

.privacy-steps p,
.feature p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

.verify-tip {
  margin-bottom: 0;
  border-radius: 0.85rem;
  padding: 0.85rem 1rem;
  background: var(--privacy-soft);
  color: var(--privacy-strong);
  font-weight: 700;
}

.features {
  margin: 0;
}

.feature {
  box-shadow: none;
}

.faq h3 {
  margin-bottom: 0.25rem;
}

.terms ul {
  display: grid;
  gap: 0.45rem;
  margin: 0.25rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.site-footer {
  padding: 1rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}

.site-footer p {
  margin-bottom: 0.45rem;
}

.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.preview-modal[hidden] {
  display: none;
}

.preview-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.72);
}

.preview-modal-card {
  position: relative;
  width: min(100%, 64rem);
  max-height: min(90vh, 54rem);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.preview-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 1;
}

.preview-modal-img {
  display: block;
  width: 100%;
  max-height: calc(90vh - 7rem);
  object-fit: contain;
  border-radius: 0.75rem;
  background: var(--surface-soft);
}

.preview-nav {
  position: absolute;
  top: 50%;
  z-index: 1;
  width: 3rem;
  height: 3rem;
  padding: 0;
  transform: translateY(-50%);
  background: rgba(15, 23, 42, 0.78);
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  box-shadow: none;
}

.preview-prev {
  left: 1.25rem;
}

.preview-next {
  right: 1.25rem;
}

.preview-nav[disabled] {
  opacity: 0.25;
}

.preview-title {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 20;
  max-width: min(24rem, calc(100vw - 2rem));
  border: 1px solid var(--privacy-border);
  border-radius: 0.95rem;
  padding: 0.9rem 1rem;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 800;
  animation: toast-in 0.28s ease-out;
}

.toast[hidden] {
  display: none;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 760px) {
  .topbar {
    margin-bottom: 2rem;
  }

  .hero-grid,
  .controls,
  .privacy-steps,
  .features {
    grid-template-columns: 1fr;
  }

  .hero .converter {
    order: -1;
  }

  .hero-copy {
    order: 1;
  }

  h1 {
    max-width: none;
  }

  .privacy-panel {
    padding: 1.15rem;
  }

  .donate {
    padding: 0.58rem 0.8rem;
    font-size: 0.9rem;
  }
}