/* ==========================================================================
   Free demo pages (initiate_demo.html, try_demo_preview.html, demo_notice.html).
   Vanilla CSS on top of site.css tokens. The "book page" mirrors the exported
   eBook style (core_logic/book_engine.py BOOK_CSS palette).
   ========================================================================== */

.dm-page { --dm-paper: #fdfaf6; --dm-paper-2: #f5f0e9; --dm-paper-line: #e4d8c2; --dm-paper-ink: #2f2d2a;
           --dm-paper-ink-2: #6b6257; --dm-paper-head: #3d372f; --dm-paper-accent: #78552d; }

.dm-shell { max-width: 860px; margin: 0 auto; padding: 8px var(--gutter) 56px; }
.dm-shell--narrow { max-width: 640px; }
/* The pages toggle panels with the hidden attribute: never let a display rule below override it. */
.dm-shell [hidden] { display: none !important; }

.dm-icon { width: 1.15em; height: 1.15em; flex: none; vertical-align: -0.2em; fill: none; stroke: currentColor;
           stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Page head ---------- */
.dm-head { text-align: center; margin: 12px auto 22px; max-width: 680px; }
.dm-eyebrow { font-size: var(--fs-xs); font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
              color: var(--c-brand-ink); margin-bottom: 6px; }
.dm-title { font-family: var(--font-serif); font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.3rem); line-height: 1.2;
            color: var(--c-ink); margin-bottom: 10px; }
.dm-lede { color: var(--c-ink-2); font-size: var(--fs-lg); }
.dm-meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 10px; color: var(--c-ink-2);
           font-size: var(--fs-sm); }
.dm-meta strong { color: var(--c-ink); font-weight: 600; overflow-wrap: anywhere; }
.dm-wait { margin-top: 6px; color: var(--c-ink-3); font-size: var(--fs-xs); }

/* ---------- Step tracker ---------- */
.dm-steps { list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px;
            margin: 0 0 18px; padding: 0; counter-reset: dm-step; }
.dm-step { display: flex; align-items: center; gap: 8px; min-width: 0; padding: 8px 10px; border-radius: var(--radius-md);
           background: #fff; border: 1px solid var(--c-line); color: var(--c-ink-3); font-size: var(--fs-xs);
           font-weight: 600; line-height: 1.3; }
.dm-step__dot { width: 10px; height: 10px; border-radius: 50%; flex: none; background: var(--c-line-strong); }
.dm-step.is-active { color: var(--c-ink); border-color: var(--c-brand-ink); background: var(--c-brand-tint); }
.dm-step.is-active .dm-step__dot { background: var(--c-brand-ink); animation: dm-pulse 1.2s ease-in-out infinite; }
.dm-step.is-done { color: var(--c-success); }
.dm-step.is-done .dm-step__dot { background: var(--c-success); }
@media (max-width: 559px) { .dm-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ---------- Alerts and cards ---------- */
.dm-alert { display: flex; gap: 12px; align-items: flex-start; margin: 0 0 18px; padding: 14px 16px;
            border-radius: var(--radius-md); background: var(--c-warning-bg); border: 1px solid #efd58c; color: var(--c-ink); }
.dm-alert > .dm-icon { color: var(--c-warning); width: 1.4em; height: 1.4em; margin-top: 1px; }
.dm-alert__body { flex: 1; min-width: 0; }
.dm-alert__body > p { margin: 0; }
.dm-alert .dm-actions { margin-top: 12px; }
.dm-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg); box-shadow: var(--shadow-1);
           padding: clamp(18px, 4vw, 32px); }
.dm-card--center { text-align: center; }
.dm-card--center .dm-actions { justify-content: center; margin-top: 0; }
.dm-card > p { margin-top: 14px; }

/* ---------- Buttons and links (light surfaces) ---------- */
.dm-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.dm-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px;
          padding: .6rem 1.1rem; border-radius: var(--radius-md); border: 2px solid transparent; font-weight: 600;
          font-size: 1rem; line-height: 1.2; text-align: center; text-decoration: none; cursor: pointer;
          background: transparent; color: var(--c-brand-ink); }
.dm-btn:hover { text-decoration: none; }
.dm-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.dm-btn--lg { min-height: 50px; padding: .75rem 1.3rem; font-size: 1.0625rem; }
.dm-btn--block { width: 100%; }
.dm-btn--primary { background: var(--c-brand-ink); color: #fff; }
.dm-btn--primary:hover { background: var(--c-brand-ink-strong); color: #fff; }
.dm-btn--outline { border-color: var(--c-brand-ink); color: var(--c-brand-ink); background: #fff; }
.dm-btn--outline:hover { background: var(--c-brand-tint); color: var(--c-brand-ink-strong); }
.dm-btn--ghost { color: var(--c-ink-2); }
.dm-btn--ghost:hover { color: var(--c-ink); background: rgba(15, 23, 42, .05); }
.dm-btn.is-disabled { opacity: .55; cursor: not-allowed; }
.dm-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }

/* ---------- The book page ---------- */
.dm-book { position: relative; background: var(--dm-paper); color: var(--dm-paper-ink); font-family: var(--font-serif);
           border: 1px solid #eadfcd; border-radius: var(--radius-lg); box-shadow: var(--shadow-2);
           padding: clamp(20px, 5vw, 56px); }
.dm-book:lang(zh), .dm-book:lang(ja), .dm-book:lang(ko) { font-family: var(--font-sans); }
.dm-book__head { text-align: center; margin-bottom: 8px; animation: dm-fade-in .5s ease both; }
.dm-book__title { font-family: var(--font-serif); font-size: clamp(1.6rem, 1.1rem + 2vw, 2.4rem); line-height: 1.2;
                  color: var(--dm-paper-head); margin: 0 0 8px; overflow-wrap: anywhere; }
.dm-book__subtitle { font-size: 1.15rem; color: var(--dm-paper-ink-2); margin: 0 0 14px; }
.dm-book__blurb { font-style: italic; color: var(--dm-paper-ink-2); max-width: 36em; margin: 0 auto 6px; }

.dm-toc { background: var(--dm-paper-2); border: 1px solid var(--dm-paper-line); border-radius: var(--radius-md);
          padding: 16px 20px; margin: 22px 0 30px; animation: dm-fade-in .5s ease both; }
.dm-toc__heading { font-family: var(--font-sans); font-size: var(--fs-sm); letter-spacing: .06em; text-transform: uppercase;
                   color: var(--dm-paper-ink-2); margin: 0 0 10px; text-align: center; }
.dm-toc__list { margin: 0; padding-left: 1.4em; }
.dm-toc__item { margin-bottom: 10px; }
.dm-toc__item:last-child { margin-bottom: 0; }
.dm-toc__title { font-weight: 700; color: var(--dm-paper-head); }
.dm-toc__summary { display: block; font-size: .95rem; color: var(--dm-paper-ink-2); }
.dm-toc__item.is-locked .dm-toc__title, .dm-toc__item.is-locked .dm-toc__summary { opacity: .78; }
.dm-badge { display: inline-flex; align-items: center; gap: 4px; margin-top: 4px; padding: 2px 9px; border-radius: var(--radius-pill);
            background: #ece3d3; color: #5c4d38; font-family: var(--font-sans); font-size: .75rem; font-weight: 600; }
.dm-badge .dm-icon { width: 1em; height: 1em; }

.dm-chapter__title { font-family: var(--font-serif); font-size: clamp(1.3rem, 1.1rem + .8vw, 1.6rem); color: var(--dm-paper-head);
                     border-bottom: 1px solid #d4c8af; padding-bottom: .35em; margin: 0 0 1em; }
.dm-chapter__body { font-size: 1.125rem; line-height: 1.75; overflow-wrap: break-word; }
.dm-chapter__body p { margin: 0 0 1.1em; }
.dm-chapter__body h3, .dm-chapter__body h4 { font-family: var(--font-sans); font-size: 1.15rem; color: var(--dm-paper-head);
                                             margin: 1.6em 0 .6em; }
.dm-chapter__body ul, .dm-chapter__body ol { margin: 0 0 1.1em; padding-left: 1.5em; }
.dm-chapter__body li { margin-bottom: .35em; }
.dm-chapter__body blockquote { margin: 1.2em 0 1.2em .5em; padding-left: 1em; border-left: 3px solid #c8bba2; font-style: italic; color: #555; }
.dm-chapter__body table { border-collapse: collapse; margin: 1.2em 0; width: 100%; display: block; overflow-x: auto; }
.dm-chapter__body th, .dm-chapter__body td { border: 1px solid #d4c8af; padding: 6px 10px; text-align: left; }
.dm-chapter__body code { background: #f0ebe3; padding: 1px 4px; border-radius: 3px; font-family: var(--font-mono); font-size: .9em; }
.dm-chapter__body hr { border: 0; border-top: 1px solid #d4c8af; margin: 1.6em 0; }
.dm-book:lang(zh) .dm-chapter__body, .dm-book:lang(ja) .dm-chapter__body { line-height: 1.95; }

/* Typing caret on the block being written */
.dm-caret::after, .dm-caret-solo { content: ""; display: inline-block; width: .5em; height: 1.05em; margin-left: 3px;
                                   vertical-align: -0.15em; background: var(--c-brand-ink); animation: dm-blink 1s steps(1) infinite; }

.dm-progress { display: flex; align-items: center; gap: 12px; margin-top: 18px; font-family: var(--font-sans); }
.dm-progress__bar { flex: 1; height: 6px; border-radius: var(--radius-pill); background: #ece3d3; overflow: hidden; }
.dm-progress__fill { display: block; height: 100%; width: 0; background: var(--c-brand-ink); transition: width .4s ease; }
.dm-progress__text { font-size: var(--fs-xs); color: var(--dm-paper-ink-2); white-space: nowrap; }

/* Waiting state */
.dm-skeleton { padding: 8px 0 4px; }
.dm-skeleton__line { display: block; height: 14px; border-radius: 7px; margin: 14px 0;
                     background: linear-gradient(90deg, #efe6d8 25%, #f9f4ec 40%, #efe6d8 65%); background-size: 400% 100%;
                     animation: dm-shimmer 1.4s ease infinite; }
.dm-skeleton__line--title { height: 30px; width: 62%; margin: 6px auto 12px; }
.dm-skeleton__line--sub { width: 42%; margin: 0 auto 30px; }
.dm-skeleton__line--short { width: 55%; }
.dm-tip { font-family: var(--font-sans); font-size: var(--fs-sm); color: var(--dm-paper-ink-2); text-align: center;
          max-width: 34em; margin: 10px auto 0; }

/* What the full book would contain */
.dm-teaser { margin-top: 30px; padding: 18px 22px; background: var(--dm-paper-2); border: 1px dashed #cbbd9f;
             border-radius: var(--radius-md); animation: dm-fade-in .5s ease both; }
.dm-teaser__heading { font-family: var(--font-sans); font-size: var(--fs-sm); letter-spacing: .06em; text-transform: uppercase;
                      color: var(--dm-paper-ink-2); margin: 0 0 8px; }
.dm-teaser__text { margin: 0 0 10px; }
.dm-locked { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.dm-locked li { display: flex; align-items: baseline; gap: 8px; color: var(--dm-paper-ink-2); }
.dm-locked .dm-icon { width: 1em; height: 1em; color: #9a8b73; transform: translateY(2px); }

.dm-ai-note { text-align: center; color: var(--c-ink-3); font-size: var(--fs-xs); margin: 14px 0 0; }

/* ---------- Conversion panel (dark) ---------- */
.dm-cta { display: grid; grid-template-columns: minmax(0, 1fr); gap: 22px; margin-top: 22px; padding: clamp(20px, 4vw, 40px);
          border-radius: var(--radius-lg); background: var(--c-night); color: var(--c-on-night); }
@media (min-width: 820px) { .dm-cta { grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); align-items: start; } }
.dm-cta .dm-eyebrow { color: var(--c-brand); }
.dm-cta__title { font-family: var(--font-serif); font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem); line-height: 1.2; color: #fff; margin-bottom: 10px; }
.dm-cta__lede { color: var(--c-on-night); }
.dm-cta__points { list-style: none; padding: 0; margin: 14px 0; display: grid; gap: 8px; }
.dm-cta__points li { display: flex; gap: 10px; align-items: flex-start; }
.dm-cta__points .dm-icon { color: var(--c-brand); margin-top: 3px; }
.dm-cta__price { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin: 16px 0 8px; color: var(--c-on-night-2); }
.dm-cta__price strong { font-size: 1.6rem; color: #fff; }
.dm-cta__byok { display: flex; gap: 10px; align-items: flex-start; color: var(--c-on-night-2); font-size: var(--fs-sm); }
.dm-cta__byok .dm-icon { color: var(--c-brand); margin-top: 2px; }
.dm-cta a:not(.dm-btn) { color: #7dd3fc; text-decoration: underline; }
.dm-cta a:not(.dm-btn):hover { color: #fff; }
.dm-cta__example { margin-top: 14px; font-size: var(--fs-sm); }
.dm-cta .dm-btn--primary { background: var(--c-brand); color: var(--c-night); }
.dm-cta .dm-btn--primary:hover { background: #33bbff; color: var(--c-night); }
.dm-cta .dm-btn--outline { background: transparent; border-color: #5b6b82; color: #fff; }
.dm-cta .dm-btn--outline:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.dm-cta .dm-btn--ghost { color: var(--c-on-night-2); }
.dm-cta .dm-btn--ghost:hover { color: #fff; background: rgba(255, 255, 255, .06); }
.dm-cta .dm-btn:focus-visible { box-shadow: 0 0 0 3px var(--c-night), 0 0 0 6px var(--c-brand); }
.dm-dl { background: var(--c-night-2); border: 1px solid var(--c-line-night); border-radius: var(--radius-md); padding: 18px; }
.dm-dl__title { display: flex; align-items: center; gap: 8px; color: #fff; font-size: 1.05rem; margin-bottom: 12px; }
.dm-dl__title .dm-icon { color: var(--c-brand); }
.dm-dl__list { list-style: none; padding: 0; margin: 0 0 12px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.dm-dl__note { font-size: var(--fs-xs); color: var(--c-on-night-2); margin: 0 0 12px; }
.dm-dl__note:last-child { margin: 12px 0 0; }

/* ---------- Form (stand-alone demo page) ---------- */
.dm-form { display: grid; gap: 16px; }
.dm-field { display: grid; gap: 6px; }
.dm-label { font-weight: 600; font-size: var(--fs-sm); color: var(--c-ink); }
.dm-input { width: 100%; min-height: 48px; padding: .65rem .85rem; border: 1px solid var(--c-line-strong); border-radius: var(--radius-md);
            background: #fff; font-size: 1rem; }
.dm-input:focus { outline: none; border-color: var(--c-brand-ink); box-shadow: 0 0 0 3px rgba(0, 105, 168, .2); }
.dm-input.is-invalid { border-color: var(--c-danger); }
.dm-hint { font-size: var(--fs-xs); color: var(--c-ink-3); margin: 0; }
.dm-hint--center { text-align: center; }

/* ---------- Motion ---------- */
@keyframes dm-blink { 50% { opacity: 0; } }
@keyframes dm-pulse { 50% { transform: scale(.7); opacity: .6; } }
@keyframes dm-shimmer { 0% { background-position: 100% 0; } 100% { background-position: 0 0; } }
@keyframes dm-fade-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
    .dm-caret::after, .dm-caret-solo, .dm-step.is-active .dm-step__dot, .dm-skeleton__line { animation: none; }
    .dm-book__head, .dm-toc, .dm-teaser { animation: none; }
}