*,
*::before,
*::after { box-sizing: border-box; }

html { overflow-x: clip; }
body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}

code {
  font-family: var(--font-label);
  font-size: 0.85em;
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  padding: 0.1em 0.35em;
}

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: inherit;
}

.mono {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Hum 按钮系统 */
.btn {
  --btn-face: var(--color-accent); --btn-ink: var(--color-accent-ink);
  --btn-edge: var(--color-accent-deep); --btn-cast: var(--shadow-cast-btn);
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  padding: 0.8rem 1.4rem; font-weight: 600; border: 0; border-radius: var(--radius-pill);
  color: var(--btn-ink); background: var(--btn-face); cursor: pointer;
  box-shadow: 0 4px 0 0 var(--btn-edge), 0 6px 12px -3px var(--btn-cast);
  transform: translateY(0);
  transition: transform 140ms cubic-bezier(0.2,0.7,0.3,1), box-shadow 140ms cubic-bezier(0.2,0.7,0.3,1);
  white-space: nowrap;
}
.btn:hover  { transform: translateY(-2px); box-shadow: 0 6px 0 0 var(--btn-edge), 0 12px 22px -4px var(--btn-cast); }
.btn:active { transform: translateY(3px);  box-shadow: 0 1px 0 0 var(--btn-edge); transition-duration: 70ms; }
.btn:focus-visible { outline: 3px solid color-mix(in oklch, var(--btn-edge) 70%, var(--color-focus)); outline-offset: 3px; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; pointer-events: none; transform: none; }
.btn--soft {
  --btn-face: var(--color-paper-2); --btn-ink: var(--color-ink);
  --btn-edge: var(--color-paper-3); --btn-cast: var(--shadow-cast-ink-soft);
}
.btn--danger {
  --btn-face: transparent; --btn-ink: var(--color-accent-3);
  --btn-edge: transparent; --btn-cast: transparent;
  box-shadow: 0 0 0 1px color-mix(in oklch, var(--color-accent-3) 55%, var(--color-rule-2));
}
.btn__arrow { display: inline-block; transition: transform 160ms var(--ease-out); }
.btn:hover .btn__arrow { transform: translateY(-3px); }

.link {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-rule-2);
  text-underline-offset: 0.35em;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  white-space: nowrap;
  transition: color 160ms var(--ease-out);
}
.link:hover { color: var(--color-accent-2); }

.admin__bar {
  max-width: 64rem;
  margin-inline: auto;
  padding: var(--space-md) var(--page-gutter);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.admin__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.025em;
}
.admin__badge {
  font-size: var(--text-xs);
  font-weight: 600;
  vertical-align: 0.3em;
  margin-left: 0.4em;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  padding: 0.2em 0.6em;
  border-radius: var(--radius-pill);
}
.admin__note { margin-left: auto; color: var(--color-muted); }

.admin__main {
  max-width: 64rem;
  margin-inline: auto;
  padding: var(--space-2xl) var(--page-gutter) var(--space-3xl);
}

.panel {
  background: var(--color-paper);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  box-shadow: 0 12px 32px -18px var(--shadow-cast-card);
}
.panel--login { max-width: 26rem; margin-inline: auto; }
.panel__title {
  font-size: var(--text-2xl);
  letter-spacing: -0.03em;
  margin: 0;
}
.panel__hint {
  margin-top: var(--space-sm);
  color: var(--color-ink-2);
  font-size: var(--text-sm);
}
.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.form {
  margin-top: var(--space-lg);
  display: grid;
  gap: var(--space-md);
}
.form--grid {
  grid-template-columns: 1fr 1fr;
}
.field { display: grid; gap: var(--space-2xs); min-width: 0; }
.field__label { font-weight: 600; font-size: var(--text-sm); }
.field__input {
  height: 44px;
  padding: 0 0.9rem;
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-input);
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  outline: 2px solid transparent;
  outline-offset: 1px;
  transition: background-color 160ms var(--ease-out);
  width: 100%;
  min-width: 0;
}
.field__input:hover { background: var(--color-paper-2); }
.field__input:focus-visible { outline: 2px solid var(--color-focus); background: var(--color-paper); }
.field__input--file { padding-block: 0.55rem; }
.field__helper {
  font-size: var(--text-xs);
  color: var(--color-muted);
  min-height: 1lh;
}
.field__helper[data-error="true"] { color: var(--color-error); font-weight: 600; }
.field__input[aria-invalid="true"] { border-color: var(--color-error); }

.form__actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.form__msg { font-size: var(--text-sm); color: var(--color-muted); min-height: 1lh; }
.form__msg[data-tone="error"] { color: var(--color-error); }
.form__msg[data-tone="ok"] { color: var(--color-success); }

.files { margin-top: var(--space-2xl); }
.files__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-lg);
}
.files__title { font-size: var(--text-lg); letter-spacing: -0.02em; }
.files__empty {
  margin-top: var(--space-md);
  padding: var(--space-lg);
  border-radius: var(--radius-input);
  background: var(--color-paper-2);
  border: 1px dashed var(--color-rule-2);
  color: var(--color-ink-2);
  font-size: var(--text-sm);
}
.files__list {
  list-style: none;
  margin: var(--space-md) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-xs);
}
.file-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-input);
  background: var(--color-paper);
}
.file-row__thumb {
  flex: 0 0 auto;
  width: 36px;
  height: 46px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 700;
  background: var(--color-paper-2);
  color: var(--color-ink-2);
}
.file-row__body { min-width: 0; flex: 1; }
.file-row__title {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-row__sub {
  font-size: var(--text-xs);
  color: var(--color-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-row__url {
  font-size: var(--text-xs);
  color: var(--color-accent-2);
  text-decoration: none;
}
.file-row__url:hover { text-decoration: underline; }

@media (max-width: 40rem) {
  .form--grid { grid-template-columns: 1fr; }
  .admin__note { display: none; }
  .panel { padding: var(--space-lg); }
  .file-row { flex-wrap: wrap; }
  .file-row .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 150ms !important;
    transition-duration: 150ms !important;
  }
}