:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #667085;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #d8dee9;
  --error: #b42318;
  --success: #027a48;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

.page-center {
  display: grid;
  place-items: center;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 8px;
}

.layout {
  display: grid;
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px 40px;
}

.card {
  width: 100%;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 16px 45px rgba(15, 23, 42, 0.08);
}

.login-card {
  max-width: 420px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 22px;
}

.muted {
  color: var(--muted);
  line-height: 1.7;
}

.form {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

label {
  color: #344054;
  font-weight: 700;
}

input[type="password"],
input[type="file"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  font: inherit;
}

button {
  cursor: pointer;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  background: var(--primary);
  color: #fff;
  font: inherit;
  font-weight: 700;
  transition: background 0.2s ease, transform 0.2s ease;
}

button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
  transform: none;
}

.secondary-button {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
}

.secondary-button:hover {
  background: #f8fafc;
}

.section-title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.message {
  min-height: 24px;
  margin: 14px 0 0;
  color: var(--success);
}

.message.error {
  color: var(--error);
}

.file-list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.file-list.empty {
  padding: 18px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  color: var(--muted);
  text-align: center;
}

.file-item {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fbfdff;
}

.file-name {
  overflow-wrap: anywhere;
  font-weight: 800;
}

.file-meta {
  color: var(--muted);
  font-size: 14px;
}

.link-row {
  display: grid;
  grid-template-columns: 84px 1fr auto;
  align-items: center;
  gap: 10px;
}

.link-row a {
  overflow: hidden;
  color: var(--primary);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-button {
  padding: 8px 10px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 14px;
}

@media (max-width: 680px) {
  .topbar,
  .section-title {
    align-items: stretch;
    flex-direction: column;
  }

  .link-row {
    grid-template-columns: 1fr;
  }
}