:root { --canvas-accent: #68447e; --canvas-line: #b5a1c0; --canvas-paper: #fff; --canvas-back: #f8f7f9; --canvas-dot: #e6e1e9; }
body { font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
.site-chrome { position: static; min-height: 64px; }
.chrome-note { color: var(--muted); }
.canvas-shell { max-width: 1440px; margin: auto; padding: 24px clamp(20px, 3vw, 44px) 32px; }
.canvas-heading { margin-bottom: 20px; }
.canvas-heading .eyebrow { margin-bottom: 8px; letter-spacing: .16em; }
.canvas-heading h1 { margin: 0; font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif; font-size: clamp(30px, 3vw, 42px); font-weight: 600; letter-spacing: .06em; }
.canvas-heading p:last-child { margin: 10px 0 0; color: var(--secondary); font-size: 14px; }
.canvas-guide { margin-bottom: 22px; color: var(--secondary); font-size: 14px; }
.canvas-guide summary { width: fit-content; min-height: 44px; padding: 10px 0; cursor: pointer; text-decoration: underline; text-underline-offset: 5px; text-decoration-color: var(--divider); }
.canvas-guide p { max-width: 820px; line-height: 1.9; }
.canvas-meta { display: flex; gap: 36px; margin-bottom: 22px; }
.canvas-export { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 18px; margin: 22px 0 18px; font-size: 12px; color: var(--muted); }
.canvas-export button { min-height: 44px; padding: 10px 18px; border: 1px solid var(--canvas-line); border-radius: 6px; color: var(--canvas-accent); background: var(--canvas-paper); font: inherit; font-size: 14px; cursor: pointer; }
.canvas-export button:hover { border-color: var(--canvas-accent); background: var(--canvas-back); }
#export-dialog { width: min(580px, calc(100% - 32px)); max-height: calc(100dvh - 32px); padding: clamp(20px, 4vw, 32px); border: 1px solid var(--canvas-line); border-radius: 14px; background: var(--canvas-paper); color: var(--ink); }
#export-dialog::backdrop { background: #0006; }
#export-dialog h2 { margin: 0 0 12px; font-size: 22px; }
#export-dialog p, #export-dialog label { font-size: 14px; }
#export-dialog label { display: block; margin: 24px 0 10px; font-weight: 600; }
#agent-prompt { display: block; width: 100%; padding: 14px; border: 1px solid var(--divider); border-radius: 6px; background: var(--canvas-back); color: var(--ink); font: 14px/1.8 "PingFang SC", "Microsoft YaHei", sans-serif; resize: vertical; }
.dialog-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.dialog-actions button { min-height: 44px; padding: 10px 18px; border: 1px solid var(--canvas-line); border-radius: 6px; background: var(--canvas-paper); color: var(--canvas-accent); font: inherit; font-size: 14px; cursor: pointer; }
.dialog-actions button:first-child { background: var(--canvas-accent); color: var(--canvas-paper); }
#copy-status { margin-bottom: 0; color: var(--secondary); }
#copy-status:empty { display: none; }
.canvas-meta label { display: flex; align-items: center; gap: 16px; flex: 1; color: var(--secondary); font-size: 13px; white-space: nowrap; }
.form-control { display: block; width: 100%; min-width: 0; color: var(--ink); background: transparent; font: 400 14px/1.85 "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
.canvas-meta input { height: 44px; padding: 6px 2px; border: 0; border-bottom: 1px solid var(--divider); border-radius: 0; }
.form-control::placeholder { color: var(--muted); opacity: 1; }
.canvas-grid { display: grid; grid-template-columns: repeat(10, minmax(0, 1fr)); grid-template-rows: 205px 205px 190px; grid-template-areas: "problem problem solution solution value value advantage advantage customer customer" "problem problem metrics metrics value value channels channels customer customer" "cost cost cost cost cost revenue revenue revenue revenue revenue"; gap: 14px; padding: 24px; border: 1px solid var(--divider); border-radius: 20px; background: radial-gradient(var(--canvas-dot) .8px, transparent .8px) 0 0 / 10px 10px, var(--canvas-back); }
.canvas-grid section { display: flex; flex-direction: column; min-width: 0; min-height: 0; padding: 18px; border: 1.5px solid var(--canvas-line); border-radius: 9px; background: var(--canvas-paper); transition: border-color .15s; }
.canvas-grid section:focus-within { border-color: var(--canvas-accent); box-shadow: 0 0 0 1px var(--canvas-accent); }
.canvas-grid .form-label { display: flex; justify-content: space-between; align-items: baseline; gap: 6px; color: var(--canvas-accent); font-size: 16px; font-weight: 600; line-height: 1.5; }
.step { flex-shrink: 0; color: var(--muted); font-size: 11px; font-weight: 400; }
textarea.form-control { flex: 1; min-height: 0; margin-top: 16px; padding: 0; border: 0; border-radius: 0; resize: none; }
textarea.form-control:focus-visible { outline: none; }
.problem { grid-area: problem; } .customer { grid-area: customer; } .value { grid-area: value; } .solution { grid-area: solution; } .channels { grid-area: channels; } .revenue { grid-area: revenue; } .cost { grid-area: cost; } .metrics { grid-area: metrics; } .advantage { grid-area: advantage; }
.canvas-footer { display: flex; justify-content: space-between; gap: 20px; margin-top: 16px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.canvas-footer p { margin: 0; }
.canvas-footer p:last-child { text-align: right; }
@media (prefers-color-scheme: dark) { :root { --canvas-accent: #d9bde9; --canvas-line: #75637f; --canvas-paper: #211e24; --canvas-back: #19171b; --canvas-dot: #302a35; } }
@media (max-width: 1050px) { .canvas-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-template-rows: none; grid-auto-rows: 260px; grid-template-areas: "customer problem" "value solution" "channels revenue" "cost metrics" "advantage advantage"; } }
@media (max-width: 600px) { .canvas-shell { padding-top: 16px; } .chrome-note { display: none; } .canvas-heading h1 { font-size: 32px; } .canvas-meta { flex-direction: column; gap: 8px; } .canvas-grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "customer" "problem" "value" "solution" "channels" "revenue" "cost" "metrics" "advantage"; grid-auto-rows: 320px; padding: 12px; gap: 12px; border-radius: 14px; } .canvas-grid section { padding: 20px; } .form-control { font-size: 16px; } .canvas-footer { flex-direction: column; gap: 8px; } .canvas-footer p:last-child { text-align: left; } }
@media (prefers-reduced-motion: reduce) { .canvas-grid section { transition: none; } }

.canvas-meta input:focus-visible, #agent-prompt:focus-visible { outline: none; border-color: var(--canvas-accent); }

.guide-steps { display: flex; flex-wrap: wrap; gap: 8px 0; padding: 0; margin: 14px 0; list-style: none; line-height: 1.9; }
.guide-steps li { white-space: nowrap; }
.guide-steps li:not(:last-child)::after { content: "→"; margin: 0 10px; color: var(--muted); }