:root {
  --ink: #141414;
  --muted: #626262;
  --line: #d9d9d9;
  --paper: #ffffff;
  --soft: #f6f7f5;
  --accent: #1f5d4a;
  --accent-strong: #174635;
  --danger: #a93434;
  --success: #177245;
  --shadow: 0 20px 45px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--soft);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  letter-spacing: 0;
}

button,
input,
textarea,
select {
  font: inherit;
}

.submit-shell {
  min-height: 100vh;
  padding: 18px;
}

.submit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1380px;
  margin: 0 auto 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand img {
  width: 38px;
  height: 38px;
  object-fit: cover;
  border-radius: 4px;
}

.environment-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--paper);
  font-size: 13px;
  padding: 7px 12px;
}

.auth-controls {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.auth-user {
  color: var(--muted);
  font-size: 13px;
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.auth-gate {
  display: grid;
  gap: 14px;
  max-width: 720px;
  margin: 80px auto 0;
  padding: 34px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.auth-gate[hidden],
.workspace[hidden] {
  display: none;
}

.auth-gate h1 {
  font-size: 30px;
  line-height: 1.15;
  margin: 0;
}

.auth-gate p {
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}

.auth-gate .upload-button {
  justify-self: start;
}

.auth-status {
  min-height: 20px;
  font-size: 13px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
  gap: 18px;
  max-width: 1380px;
  margin: 0 auto;
  align-items: start;
}

.form-surface,
.packet-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.form-surface {
  min-height: calc(100vh - 94px);
  padding: 8px;
}

.packet-panel {
  position: sticky;
  top: 18px;
  padding: 18px;
}

.packet-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.packet-head h2 {
  font-size: 17px;
  line-height: 1.25;
  margin: 0;
}

.icon-button,
.upload-button,
.secondary-button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  min-height: 38px;
  padding: 8px 12px;
}

.icon-button:hover,
.upload-button:hover,
.secondary-button:hover {
  border-color: var(--accent);
}

.upload-button {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 700;
}

.upload-button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.packet-summary {
  display: grid;
  gap: 12px;
  margin: 16px 0;
}

.packet-summary div {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 12px;
}

.packet-summary dt {
  color: var(--muted);
  font-size: 13px;
}

.packet-summary dd {
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
}

.payload-preview {
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfbfb;
  color: #303030;
  font-family: Consolas, Menlo, Monaco, monospace;
  font-size: 12px;
  line-height: 1.45;
  margin: 0;
  padding: 12px;
  white-space: pre-wrap;
}

.upload-zone {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfbfb;
  padding: 16px;
}

.upload-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.upload-status {
  color: var(--muted);
  font-size: 13px;
  margin: 10px 0 0;
}

.upload-status.error {
  color: var(--danger);
}

.upload-status.success {
  color: var(--success);
}

.upload-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.upload-item {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 10px;
}

.upload-thumb {
  width: 82px;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  object-fit: cover;
}

.upload-main {
  min-width: 0;
}

.upload-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.upload-url {
  color: var(--muted);
  font-family: Consolas, Menlo, Monaco, monospace;
  font-size: 12px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.cover-choice {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
}

.review-grid {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fbfbfb;
}

.review-row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 12px;
}

.review-label {
  color: var(--muted);
}

.sd-root-modern {
  --sjs-primary-backcolor: var(--accent);
  --sjs-primary-backcolor-dark: var(--accent-strong);
  --sjs-general-backcolor: #ffffff;
  --sjs-general-forecolor: var(--ink);
  --sjs-border-default: var(--line);
  --sjs-corner-radius: 6px;
}

.sd-container-modern {
  background: transparent;
}

.sd-body.sd-body--static {
  max-width: 920px;
  margin: 0 auto;
}

.sd-title {
  letter-spacing: 0;
}

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

  .packet-panel {
    position: static;
  }

  .form-surface {
    min-height: auto;
  }
}

@media (max-width: 620px) {
  .submit-shell {
    padding: 12px;
  }

  .submit-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .auth-controls {
    justify-content: flex-start;
  }

  .auth-gate {
    margin-top: 32px;
    padding: 22px;
  }

  .packet-summary div,
  .review-row {
    grid-template-columns: 1fr;
  }

  .upload-item {
    grid-template-columns: 68px minmax(0, 1fr);
  }

  .upload-thumb {
    width: 68px;
  }
}