:root {
  --canvas: #f8faff;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: #ffffff;
  --line: #e0e6f5;
  --line-strong: #cfd8ef;
  --text: #071432;
  --muted: #65749a;
  --accent: #4b35e6;
  --accent-2: #745af7;
  --accent-soft: #ece8ff;
  --warning: #b42318;
  --success: #16825d;
  --shadow: 0 18px 50px rgba(31, 43, 92, 0.08);
  --radius: 8px;
  --font: "Aptos", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    radial-gradient(circle at 18% 10%, rgba(116, 90, 247, 0.12), transparent 26rem),
    linear-gradient(180deg, #fbfcff 0%, var(--canvas) 100%);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

svg {
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.app-shell {
  width: 100%;
  min-height: 100vh;
  padding: 20px;
}

.topbar,
.workspace,
.recent-panel {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 92px;
  padding: 20px 26px;
  border-radius: var(--radius);
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, #4a33dd 0%, #6b52f7 58%, #16a3ff 100%);
  box-shadow: 0 14px 24px rgba(74, 51, 221, 0.25);
}

.brand-mark svg {
  width: 27px;
  height: 27px;
  stroke-width: 1.9;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  color: #302ce0;
  font-size: 23px;
  font-weight: 800;
}

.brand p {
  margin-top: 4px;
  color: #45527d;
  font-size: 15px;
}

.utility-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 0;
  color: #52658f;
  background: transparent;
  border-radius: 8px;
}

.icon-button:hover {
  background: #edf2ff;
  color: var(--accent);
}

.icon-button svg {
  width: 22px;
  height: 22px;
}

.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 22px;
  padding: 22px 24px 24px;
  border-radius: var(--radius);
}

.panel h2,
.recent-panel h2 {
  color: #060d26;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0;
}

.drop-zone {
  display: grid;
  place-items: center;
  min-height: 492px;
  margin-top: 20px;
  border: 1.5px dashed #715df2;
  border-radius: 10px;
  background:
    radial-gradient(circle at 52% 25%, rgba(116, 90, 247, 0.08), transparent 18rem),
    rgba(255, 255, 255, 0.58);
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.drop-zone.is-dragging,
.drop-zone:focus-visible {
  border-color: #4029d9;
  box-shadow: 0 0 0 5px rgba(74, 51, 221, 0.11);
}

.drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transform: translateY(-4px);
}

.upload-cloud {
  width: 66px;
  height: 66px;
  color: #887bec;
  stroke-width: 1.8;
}

.drop-title {
  margin-top: 24px;
  color: #332be4;
  font-size: 19px;
  font-weight: 800;
}

.drop-subtitle {
  margin-top: 13px;
  color: #66749d;
  font-size: 14px;
}

.primary-upload {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  margin-top: 34px;
  padding: 0 22px;
  border: 0;
  border-radius: 7px;
  color: #fff;
  background: linear-gradient(180deg, #644cf2 0%, #4c31db 100%);
  box-shadow: 0 10px 20px rgba(76, 49, 219, 0.24);
  font-weight: 800;
}

.primary-upload:hover {
  filter: brightness(1.03);
}

.primary-upload:disabled,
.send-button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.primary-upload svg {
  width: 18px;
  height: 18px;
}

.state-text {
  min-height: 20px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

.state-text.error {
  color: var(--warning);
}

.state-text.success {
  color: var(--success);
}

.output-card {
  display: grid;
  min-height: 348px;
  max-height: 348px;
  margin-top: 20px;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background:
    radial-gradient(circle at 56% 32%, rgba(107, 82, 247, 0.08), transparent 17rem),
    rgba(255, 255, 255, 0.7);
}

.empty-output {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 30px;
  min-height: 346px;
  color: #7480a7;
  font-weight: 700;
}

.empty-output svg {
  width: 77px;
  height: 77px;
  stroke-width: 1.7;
}

.ocr-result,
.answer-result {
  padding: 22px 24px;
}

.ocr-result {
  white-space: pre-wrap;
  color: #1e2948;
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  line-height: 1.6;
}

.answer-result {
  border-top: 1px solid var(--line);
  background: rgba(250, 251, 255, 0.7);
}

.answer-result h3 {
  margin: 0 0 10px;
  color: #302ce0;
  font-size: 14px;
}

.answer-result p {
  color: #18223d;
  line-height: 1.6;
  white-space: pre-wrap;
}

.prompt-form {
  display: grid;
  grid-template-columns: 1fr 48px;
  gap: 10px;
  margin-top: 24px;
  padding: 8px 8px 8px 17px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(31, 43, 92, 0.04);
}

.prompt-form input {
  min-width: 0;
  border: 0;
  outline: none;
  color: var(--text);
}

.prompt-form input::placeholder {
  color: #68769d;
}

.send-button {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 7px;
  color: #fff;
  background: linear-gradient(180deg, #684cf3, #4e32dc);
  box-shadow: 0 8px 18px rgba(76, 49, 219, 0.24);
}

.send-button svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  stroke-width: 1.4;
}

.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}

.quick-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #0c1636;
  background: rgba(255, 255, 255, 0.82);
  font-weight: 800;
}

.quick-actions button:hover {
  border-color: #b9c2eb;
  background: #fbfcff;
}

.quick-actions svg {
  width: 20px;
  height: 20px;
  color: var(--accent);
}

.recent-panel {
  margin-top: 22px;
  padding: 22px 20px 24px;
  border-radius: var(--radius);
}

.recent-header,
.section-title,
.session-row,
.session-main,
.session-meta,
.kebab {
  display: flex;
  align-items: center;
}

.recent-header {
  justify-content: space-between;
  padding: 0 14px 18px;
}

.section-title {
  gap: 14px;
}

.section-title svg {
  width: 24px;
  height: 24px;
  color: #53699d;
}

.text-button {
  border: 0;
  color: #352ce3;
  background: transparent;
  font-weight: 800;
}

.session-list {
  display: grid;
  gap: 8px;
}

.session-row {
  justify-content: space-between;
  min-height: 69px;
  padding: 8px 22px 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.75);
  text-align: left;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.session-row:hover {
  border-color: #bfc8ec;
  box-shadow: 0 10px 28px rgba(31, 43, 92, 0.07);
  transform: translateY(-1px);
}

.session-main {
  min-width: 0;
  gap: 18px;
}

.thumb {
  display: grid;
  place-items: center;
  width: 74px;
  height: 53px;
  overflow: hidden;
  border: 1px solid #e3e8f5;
  border-radius: 6px;
  background: #f7f9fe;
  color: #7885a9;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85);
}

.thumb svg {
  width: 30px;
  height: 30px;
}

.session-title {
  overflow: hidden;
  color: #0b1533;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-subtitle {
  margin-top: 7px;
  color: #526087;
  font-size: 14px;
}

.session-meta {
  gap: 26px;
  color: #596994;
  font-size: 14px;
}

.kebab {
  justify-content: center;
  width: 28px;
  height: 28px;
  color: #153365;
}

.kebab svg {
  width: 20px;
  height: 20px;
}

.empty-list {
  min-height: 88px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #66749d;
  background: rgba(255, 255, 255, 0.62);
  text-align: center;
}

body.dark {
  --canvas: #111827;
  --surface: rgba(18, 26, 43, 0.9);
  --surface-strong: #162036;
  --line: #273553;
  --line-strong: #334262;
  --text: #eef3ff;
  --muted: #9ba8c4;
  color: var(--text);
}

body.dark html,
body.dark {
  background: #111827;
}

body.dark .brand p,
body.dark .drop-subtitle,
body.dark .session-subtitle,
body.dark .session-meta {
  color: #a7b3cf;
}

body.dark .drop-zone,
body.dark .output-card,
body.dark .prompt-form,
body.dark .quick-actions button,
body.dark .session-row,
body.dark .empty-list {
  background: rgba(22, 32, 54, 0.82);
}

body.dark .prompt-form input {
  background: transparent;
  color: var(--text);
}

body.dark .session-title,
body.dark .quick-actions button {
  color: var(--text);
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .drop-zone,
  .output-card {
    min-height: 360px;
  }

  .output-card {
    max-height: 480px;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 12px;
  }

  .topbar {
    min-height: auto;
    padding: 16px;
  }

  .brand {
    gap: 12px;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
  }

  h1 {
    font-size: 19px;
  }

  .brand p {
    font-size: 13px;
  }

  .utility-actions {
    gap: 8px;
  }

  .workspace,
  .recent-panel {
    padding: 16px;
  }

  .drop-zone {
    min-height: 320px;
  }

  .quick-actions {
    grid-template-columns: 1fr;
  }

  .session-row,
  .session-main {
    align-items: flex-start;
  }

  .session-row {
    gap: 14px;
    padding: 10px;
  }

  .session-meta {
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
  }
}