:root {
  --bg: #e6eaee;
  --surface: #fdfefe;
  --surface-soft: #f3f6f8;
  --line: #cfd7df;
  --text: #1d2733;
  --muted: #667281;
  --accent: #2f6fed;
  --accent-deep: #1f4fae;
  --shadow: 0 14px 34px rgba(24, 37, 56, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, #eef2f5 0, #e1e7ec 100%);
}

.page-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(360px, 520px) minmax(320px, 380px);
  align-content: center;
  justify-content: center;
  gap: 24px;
  padding: 32px;
}

.instance-panel,
.login-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  background: var(--surface);
}

.brand,
.form-row {
  display: flex;
  align-items: center;
}

.brand {
  gap: 14px;
  text-decoration: none;
  color: var(--text);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #5c6b7b, #41505f);
  color: #fff;
  font: 700 16px/1 "Segoe UI", sans-serif;
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-text strong,
h1,
.meta-note strong {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

.brand-text small,
.lead,
.field span,
.checkbox span,
.inline-link,
.meta-note p {
  color: var(--muted);
}

.inline-link {
  text-decoration: none;
}

.instance-panel {
  padding: 24px;
  display: grid;
  align-content: start;
  gap: 22px;
  background: var(--surface-soft);
}

h1,
.login-head strong {
  font-weight: 600;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.status-pill {
  padding: 5px 10px;
  border: 1px solid #bcd8c6;
  border-radius: 999px;
  background: #eef9f1;
  color: #2d6b41;
  font-size: 12px;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 600;
  line-height: 1.15;
}

.instance-copy {
  display: grid;
  gap: 10px;
}

.lead,
.meta-note p {
  margin: 0;
  line-height: 1.45;
}

.instance-meta {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
}

.instance-meta div {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.instance-meta dt {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--muted);
}

.instance-meta dd {
  margin: 0;
  font-size: 15px;
}

.volume-table {
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--surface);
}

.volume-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.8fr 0.9fr;
  gap: 12px;
  padding: 11px 14px;
  font-size: 14px;
  border-top: 1px solid var(--line);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.volume-row:first-child {
  border-top: 0;
}

.volume-head {
  background: #eef3f7;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.login-panel {
  display: grid;
  align-content: center;
}

.login-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
}

.login-head span {
  color: var(--muted);
  font-size: 13px;
}

.login-form {
  display: grid;
  gap: 18px;
}

.login-card {
  padding: 24px;
}

.field {
  display: grid;
  gap: 10px;
}

.field span {
  font-size: 13px;
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  font: inherit;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-start;
}

.checkbox input {
  width: 16px;
  height: 16px;
}

.primary-button,
.secondary-button,
.inline-link {
  font-size: 14px;
}

.primary-button {
  width: 100%;
  padding: 12px 14px;
  border: 0;
  border-radius: 8px;
  font: inherit;
  cursor: pointer;
}

.primary-button {
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  color: #fff;
}

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

.form-message {
  min-height: 20px;
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted);
}

.form-message.is-error {
  color: #b42318;
}

.form-message.is-success {
  color: #067647;
}

.meta-note {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  background: transparent;
  border: 1px solid var(--line);
  border-left: 0;
  border-right: 0;
  border-bottom: 0;
}

@media (max-width: 1080px) {
  .page-shell {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding: 16px;
    gap: 18px;
  }

  .instance-panel,
  .login-card {
    padding: 20px;
  }

  h1 {
    font-size: 26px;
  }

  .instance-meta,
  .volume-row {
    grid-template-columns: 1fr;
  }
}

.activity-list {
  display: grid;
  gap: 14px;
}

.activity-item {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid var(--line);
}

.activity-item p {
  margin: 8px 0 10px;
  color: var(--muted);
}

.activity-item span,
.activity-item time {
  color: var(--text);
}

@media (max-width: 1080px) {
  .page-shell,
  .featured-grid,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }

  .hero {
    flex-direction: column;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding: 14px;
  }

  .sidebar,
  .hero,
  .search-panel,
  .featured-card,
  .file-panel,
  .activity-panel {
    border-radius: 22px;
  }

  .storage-stats li,
  .file-row,
  .file-row-head {
    grid-template-columns: 1fr;
  }

  .file-row {
    gap: 6px;
  }
}