:root {
  color-scheme: light;
  --canvas-bg: #ffffff;
  --canvas-text: #1d1e20;
  --canvas-muted: #85898f;
  --canvas-line: #e5e6e8;
  --canvas-card: #f7f7f8;
  --canvas-card-hover: #f2f3f4;
  --canvas-control: #ffffff;
  --canvas-primary: #202124;
  --canvas-primary-text: #ffffff;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body { min-width: 320px; color: var(--canvas-text); background: var(--canvas-bg); font-size: 14px; -webkit-font-smoothing: antialiased; }
button { font: inherit; color: inherit; cursor: pointer; }
button:focus-visible, input:focus-visible, a:focus-visible { outline: 2px solid #85898f; outline-offset: 2px; }

.canvas-library { width: min(1384px, calc(100% - 48px)); min-height: calc(100vh - var(--shared-header-height)); margin: 0 auto; padding: 52px 0 72px; }
.canvas-heading { min-height: 131px; padding-bottom: 28px; border-bottom: 1px solid var(--canvas-line); display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; }
.canvas-kicker { margin: 0 0 17px; color: var(--canvas-muted); font-size: 13px; line-height: 1; }
.canvas-heading h1 { margin: 0; font-size: 34px; line-height: 1.1; font-weight: 600; letter-spacing: 0; }
.canvas-actions { display: flex; align-items: center; gap: 10px; padding-bottom: 1px; }
.button { height: 42px; border: 1px solid var(--canvas-line); border-radius: 7px; padding: 0 17px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; background: var(--canvas-control); white-space: nowrap; transition: border-color .16s ease, background .16s ease, color .16s ease, transform .16s ease; }
.button:hover { border-color: #aeb1b5; transform: translateY(-1px); }
.button svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.button-danger { color: #313338; }
.button-danger:hover { color: #d34242; border-color: #dba8a8; }
.button-secondary { color: #303237; }
.button-primary { min-width: 139px; color: var(--canvas-primary-text); border-color: var(--canvas-primary); background: var(--canvas-primary); }
.button-primary:hover { border-color: #000; background: #000; }

.canvas-grid { padding-top: 40px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; align-items: start; }
.canvas-card { min-height: 220px; padding: 24px; border: 1px solid transparent; border-radius: 8px; background: var(--canvas-card); display: flex; flex-direction: column; cursor: pointer; transition: border-color .16s ease, background .16s ease, transform .16s ease; }
.canvas-card:hover { border-color: var(--canvas-line); background: var(--canvas-card-hover); transform: translateY(-2px); }
.canvas-card-top { display: flex; align-items: flex-start; gap: 15px; }
.canvas-select { width: 20px; height: 20px; margin: 1px 0 0; flex: 0 0 auto; accent-color: #202124; }
.canvas-card-title { min-width: 0; margin: 0; overflow: hidden; color: var(--canvas-text); font-size: 20px; line-height: 1.25; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.canvas-card-detail { margin: 18px 0 0 35px; color: var(--canvas-muted); font-size: 14px; }
.canvas-card-footer { margin-top: auto; padding-top: 42px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.canvas-time { color: var(--canvas-muted); font-size: 13px; white-space: nowrap; }
.canvas-card-tools { display: flex; align-items: center; gap: 7px; }
.canvas-icon-button { width: 31px; height: 31px; padding: 0; border: 0; border-radius: 6px; display: inline-flex; align-items: center; justify-content: center; background: transparent; color: #686c72; }
.canvas-icon-button:hover { color: var(--canvas-text); background: rgba(127, 130, 135, .12); }
.canvas-icon-button[data-action="delete"]:hover { color: #d34242; }
.canvas-icon-button svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.canvas-empty { min-height: 430px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; color: var(--canvas-muted); }
.canvas-empty[hidden] { display: none; }
.canvas-empty > svg { width: 58px; height: 58px; fill: none; stroke: #b8bbc0; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.canvas-empty h2 { margin: 18px 0 0; color: var(--canvas-text); font-size: 20px; font-weight: 600; }
.canvas-empty p { margin: 9px 0 22px; }
.toast { position: fixed; z-index: 60; left: 50%; bottom: 30px; max-width: calc(100% - 40px); padding: 10px 15px; border-radius: 7px; color: #fff; background: rgba(31,31,31,.94); opacity: 0; pointer-events: none; transform: translate(-50%, 14px); transition: opacity .18s ease, transform .18s ease; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

body.dark {
  --canvas-bg: #090a0a;
  --canvas-text: #f0f1f2;
  --canvas-muted: #93979d;
  --canvas-line: #2b2d30;
  --canvas-card: #171819;
  --canvas-card-hover: #1c1d1f;
  --canvas-control: #0e0f10;
  --canvas-primary: #e5e6e8;
  --canvas-primary-text: #151617;
}
body.dark .button:hover { border-color: #62666c; }
body.dark .button-primary:hover { border-color: #fff; background: #fff; }
body.dark .button-danger { color: #e3e5e7; }
body.dark .button-secondary { color: #e5e7ea; }
body.dark .canvas-select { accent-color: #f0f1f2; }
body.dark .canvas-icon-button { color: #c5c8cc; }
body.dark .toast { color: #151617; background: rgba(245,246,247,.96); }

@media (max-width: 1000px) {
  .canvas-library { width: calc(100% - 36px); padding-top: 38px; }
  .canvas-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .canvas-library { width: calc(100% - 28px); padding-top: 28px; }
  .canvas-heading { align-items: flex-start; flex-direction: column; }
  .canvas-actions { width: 100%; overflow-x: auto; padding-bottom: 3px; }
  .canvas-grid { grid-template-columns: 1fr; padding-top: 28px; }
  .canvas-card { min-height: 202px; }
}
@media (max-width: 470px) {
  .canvas-heading h1 { font-size: 30px; }
  .canvas-actions .button { height: 40px; padding: 0 12px; }
}