:root {
  color-scheme: dark;
  --background: #050806;
  --panel: #0c140e;
  --panel-raised: #111c13;
  --neon: #3cff14;
  --text: #eafdea;
  --muted: #a8d7ad;
  --line: rgba(60, 255, 20, 0.25);
  --error: #ff9a91;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 50% 0, rgba(60, 255, 20, 0.13), transparent 34rem),
    var(--background);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.app-shell {
  width: min(100% - 40px, 1040px);
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.app-header,
.header-actions,
.brand,
.button-row {
  display: flex;
  align-items: center;
}

.app-header {
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand {
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  background: var(--neon);
  color: #021006;
  box-shadow: 0 0 18px rgba(60, 255, 20, 0.28);
}

.header-actions {
  gap: 18px;
}

.auth-status,
.panel-copy,
.intro > p:last-child,
.file-help,
.file-name,
footer {
  color: var(--muted);
}

.auth-status {
  font-size: 0.9rem;
}

.text-button {
  padding: 8px 0;
  border: 0;
  background: transparent;
  color: var(--neon);
  font-weight: 700;
}

main {
  flex: 1;
}

.intro {
  max-width: 700px;
  padding: 76px 0 38px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--neon);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 680px;
  margin-bottom: 18px;
  font-size: clamp(2.6rem, 7vw, 4.8rem);
  letter-spacing: -0.065em;
  line-height: 0.98;
}

.intro > p:last-child,
.panel-copy {
  max-width: 680px;
  margin-bottom: 0;
  font-size: 1rem;
  line-height: 1.7;
}

.panel {
  padding: clamp(24px, 5vw, 38px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(160deg, rgba(17, 28, 19, 0.96), rgba(8, 14, 10, 0.96));
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.22);
}

.panel h2 {
  margin-bottom: 10px;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  letter-spacing: -0.045em;
}

.button-row {
  gap: 12px;
  margin-top: 26px;
}

.auth-form {
  display: grid;
  gap: 16px;
  width: min(100%, 480px);
  margin-top: 26px;
}

.auth-form label {
  display: grid;
  gap: 8px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
}

.auth-form input {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  background: rgba(5, 10, 8, 0.9);
  color: var(--text);
}

.auth-form input:focus {
  border-color: var(--neon);
  box-shadow: 0 0 0 3px rgba(60, 255, 20, 0.12);
}

.auth-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

.auth-link {
  justify-self: start;
  padding: 4px 0;
  border: 0;
  background: transparent;
  color: var(--neon);
  font-size: 0.9rem;
  font-weight: 700;
  text-align: left;
}

.primary-button,
.secondary-button {
  min-height: 48px;
  padding: 13px 20px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 800;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.primary-button {
  background: var(--neon);
  color: #021006;
  box-shadow: 0 0 18px rgba(60, 255, 20, 0.22);
}

.secondary-button {
  border-color: var(--line);
  background: rgba(4, 10, 6, 0.6);
  color: var(--text);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.file-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 26px 0 20px;
}

.file-card {
  min-width: 0;
  padding: 22px;
  border: 1px dashed rgba(60, 255, 20, 0.4);
  border-radius: 18px;
  background: rgba(5, 11, 7, 0.65);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 9px;
}

.file-index {
  color: var(--neon);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.file-card strong {
  font-size: 1.25rem;
}

.file-help,
.file-name {
  font-size: 0.88rem;
  line-height: 1.5;
}

.file-card input {
  width: 100%;
  margin-top: 6px;
  color: transparent;
  font-size: 0.82rem;
}

.file-card input::file-selector-button {
  margin-right: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-raised);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.file-name {
  width: 100%;
  overflow-wrap: anywhere;
}

.upload-button {
  width: 100%;
}

.message {
  min-height: 24px;
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.message[data-kind="success"] {
  color: var(--neon);
}

.message[data-kind="error"] {
  color: var(--error);
}

.message[data-kind="success"] {
  color: var(--neon);
}

.upload-summary {
  margin-top: 12px;
  padding: 14px 16px;
  border: 1px solid rgba(60, 255, 20, 0.2);
  border-radius: 12px;
  background: rgba(60, 255, 20, 0.06);
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.6;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 30px 0 24px;
  font-size: 0.82rem;
}

footer a {
  color: var(--neon);
  text-decoration: none;
}

[hidden] {
  display: none !important;
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 28px, 1040px);
  }

  .app-header {
    align-items: flex-start;
  }

  .header-actions {
    align-items: flex-end;
    flex-direction: column;
    gap: 4px;
  }

  .auth-status {
    font-size: 0.78rem;
    text-align: right;
  }

  .intro {
    padding-top: 56px;
  }

  .file-grid {
    grid-template-columns: 1fr;
  }

  .button-row,
  footer {
    align-items: stretch;
    flex-direction: column;
  }

  footer {
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}