/* ═══════════════════════════════════════════════
   PaperByMe · paper.css
   Shared app-page styles for all paper generator
   pages. Import after shared.css.
   Covers: app body layout, nav overrides, preview
   area, settings panel, export buttons, section
   cards, form elements, toggles, color pickers,
   margin inputs, mobile tab bar, print styles,
   and responsive breakpoints.
═══════════════════════════════════════════════ */

/* ── APP BODY LAYOUT ──────────────────────── */
/* Overrides shared.css body for full-height app mode */
body {
    height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ── NAV OVERRIDE FOR APP PAGES ───────────── */
/* app pages use full-width nav, no max-width constraint */
nav { flex-shrink: 0; }
.nav-inner { max-width: 100%; }

/* ── MAIN LAYOUT ──────────────────────────── */
main {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* ── PREVIEW AREA ─────────────────────────── */
#previewArea {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}
#previewArea::-webkit-scrollbar { width: 6px; height: 6px; }
#previewArea::-webkit-scrollbar-thumb { background: var(--rule-strong); }

#previewContainer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}
#previewContainer.multi-page {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
}

.page-wrapper {
    overflow: hidden;
    box-shadow:
        0 1px 3px rgba(var(--ink-rgb),0.10),
        0 4px 16px rgba(var(--ink-rgb),0.08),
        0 0 0 1px rgba(var(--ink-rgb),0.06);
    background: white;
    flex-shrink: 0;
}
.page-wrapper:hover {
    box-shadow:
        0 2px 6px rgba(var(--ink-rgb),0.12),
        0 8px 24px rgba(var(--ink-rgb),0.10),
        0 0 0 1px rgba(var(--ink-rgb),0.08);
}
.svgPage { display: block; width: 100%; height: auto; }

/* ── SETTINGS PANEL ───────────────────────── */
#settingsArea {
    width: 300px;
    flex-shrink: 0;
    background: var(--paper);
    border-left: 1px solid var(--rule-strong);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}
#settingsArea::-webkit-scrollbar { width: 0; }

.settings-inner {
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
}

/* ── EXPORT BUTTONS ───────────────────────── */
.export-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 6px;
}
.export-primary {
    grid-column: 1 / -1;
    background: var(--ink);
    color: white;
    border: none;
    padding: 11px;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: background 0.15s;
}
.export-primary:hover { background: #333; }

.export-secondary {
    background: var(--bg);
    color: var(--ink2);
    border: 1px solid var(--rule-strong);
    padding: 8px 6px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    letter-spacing: 0.04em;
    transition: all 0.15s;
    min-width: 0;
    word-break: break-all;
}
.export-secondary:hover { background: rgba(var(--ink-rgb),0.06); border-color: var(--guide); color: var(--ink); }
.export-secondary i { font-size: 13px; }

/* ── SECTION CARDS ────────────────────────── */
.section-card {
    background: var(--paper);
    border: 1px solid var(--rule-strong);
    position: relative;
}
.section-header {
    padding: 10px 14px 9px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--rule);
}
.section-header-icon {
    width: 20px; height: 20px;
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    display: flex; align-items: center; justify-content: center;
    font-size: 10px; color: var(--guide); flex-shrink: 0;
}
.section-title {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 600;
    color: var(--ink3);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.section-body {
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ── FORM ELEMENTS ────────────────────────── */
.form-row { display: flex; flex-direction: column; gap: 5px; }
.form-label {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    color: var(--ink3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.form-input {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 7px 10px;
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--ink);
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    -webkit-appearance: none;
    appearance: none;
    /* 👇 增加下面这行代码来锁定高度 */
    height: 32px;  /* 或者写 line-height: 1.5; */
}
.form-input:focus { border-color: var(--guide); box-shadow: 0 0 0 3px rgba(var(--ink-rgb),0.12); }
select.form-input {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23999990'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 14px;
    padding-right: 28px;
    cursor: pointer;
}
.form-input option { font-family: 'IBM Plex Mono', monospace; }

.input-hint {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink3);
    line-height: 1.5;
}

/* ── NUMBER INPUT ROW ─────────────────────── */
.cell-size-row { display: flex; gap: 6px; align-items: center; }
.cell-size-input-wrap {
    flex: 1;
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    display: flex;
    align-items: center;
    overflow: hidden;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.cell-size-input-wrap:focus-within { border-color: var(--guide); box-shadow: 0 0 0 3px rgba(var(--ink-rgb),0.12); }
.cell-size-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 7px 10px;
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--ink);
    outline: none;
    min-width: 0;
}
.cell-size-input::-webkit-outer-spin-button,
.cell-size-input::-webkit-inner-spin-button { -webkit-appearance: inner-spin-button; opacity: 0.35; }

/* ── RECOMMEND / SUGGEST BUTTON ───────────── */
.recommend-btn {
    background: var(--bg);
    color: var(--ink2);
    border: 1px solid var(--rule-strong);
    padding: 7px 12px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    white-space: nowrap;
    text-transform: uppercase;
    transition: all 0.15s;
}
.recommend-btn:hover { border-color: var(--guide); color: var(--guide); background: rgba(var(--ink-rgb),0.06); }
/* Active / toggled state used by some pages */
.recommend-btn.active-state { background: var(--ink); color: white; border-color: var(--ink); }
.recommend-btn.active-state:hover { background: #333; border-color: #333; color: white; }

/* ── GUIDE STYLE / GENERIC BUTTON GROUP ───── */
.guide-style-group {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 6px;
}
.guide-style-group.col2 { grid-template-columns: 1fr 1fr; }
.guide-style-btn {
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 7px 4px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--ink2);
    cursor: pointer;
    text-align: center;
    transition: all 0.15s;
    text-transform: uppercase;
}
.guide-style-btn.active { background: var(--ink); color: white; border-color: var(--ink); }
.guide-style-btn:hover:not(.active) { border-color: var(--guide); color: var(--guide); }

/* Generic style-btn alias (used by some pages) */
.style-btn-group { display: grid; gap: 6px; }
.style-btn-group.col2 { grid-template-columns: 1fr 1fr; }
.style-btn-group.col3,
.style-btn-group-3 { grid-template-columns: 1fr 1fr 1fr; display: grid; gap: 6px; }
.style-btn {
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 7px 4px;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--ink2);
    cursor: pointer;
    text-align: center;
    transition: all 0.15s;
    text-transform: uppercase;
}
.style-btn.active { background: var(--ink); color: white; border-color: var(--ink); }
.style-btn:hover:not(.active) { border-color: var(--guide); color: var(--guide); }

/* ── PAGE COUNT ROW ───────────────────────── */
.page-count-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

/* ── MARGIN INPUTS ────────────────────────── */
.margin-grid-2x2 { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.margin-input-wrap {
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    display: flex;
    align-items: center;
    overflow: hidden;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.margin-input-wrap:focus-within { border-color: var(--guide); box-shadow: 0 0 0 3px rgba(var(--ink-rgb),0.12); }
.margin-label {
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 700;
    color: var(--ink3);
    padding: 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-right: 1px solid var(--rule);
    min-height: 32px;
    display: flex; align-items: center;
    background: var(--paper);
    flex-shrink: 0;
}
.margin-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 7px 4px 7px 8px;
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--ink);
    outline: none;
    min-width: 0;
}
.margin-input::-webkit-outer-spin-button,
.margin-input::-webkit-inner-spin-button { -webkit-appearance: inner-spin-button; opacity: 0.35; }

/* ── TOGGLE ───────────────────────────────── */
.toggle-row { display: flex; align-items: center; justify-content: space-between; }
.toggle-label { font-family: var(--mono); font-size: 11px; color: var(--ink2); }
.toggle { position: relative; width: 38px; height: 20px; cursor: pointer; }
.toggle input { display: none; }
.toggle-track {
    width: 38px; height: 20px;
    background: var(--border);
    transition: background 0.2s;
    display: block;
}
.toggle input:checked + .toggle-track { background: var(--ink); }
.toggle-thumb {
    position: absolute;
    top: 3px; left: 3px;
    width: 14px; height: 14px;
    background: white;
    box-shadow: 0 1px 3px rgba(var(--ink-rgb),0.2);
    transition: transform 0.2s;
}
.toggle input:checked ~ .toggle-thumb { transform: translateX(18px); }

/* ── COLOR SYSTEM ─────────────────────────── */
.color-row { display: flex; align-items: center; gap: 6px; }
.color-swatches-group {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 5px 8px;
    height: 32px;
}
.color-dot {
    width: 16px; height: 16px;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
    transition: transform 0.12s;
    outline: none;
    padding: 0;
    box-shadow: inset 0 0 0 1px rgba(var(--ink-rgb),0.12);
}
.color-dot:hover { transform: scale(1.2); }
.color-dot.active {
    box-shadow: inset 0 0 0 1px rgba(var(--ink-rgb),0.12), 0 0 0 1.5px var(--bg), 0 0 0 3px var(--ink);
}
/* Light-color active states */
.color-dot[data-color="#ffffff"].active,
.color-dot[data-color="#FDFAF5"].active,
.color-dot[data-color="#F5F0E8"].active,
.color-dot[data-color="#F7F2E2"].active,
.color-dot[data-color="#EEF3F0"].active,
.color-dot[data-color="#F0EDE8"].active {
    box-shadow: inset 0 0 0 1px rgba(var(--ink-rgb),0.15), 0 0 0 1.5px var(--border), 0 0 0 3px var(--ink2);
}
.color-preview-wrap {
    position: relative;
    width: 32px; height: 32px;
    overflow: hidden;
    flex-shrink: 0;
    cursor: pointer;
    border: 1px solid var(--rule-strong);
}
.color-preview-block { width: 100%; height: 100%; transition: background 0.12s; }
.color-hidden-input {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    opacity: 0; cursor: pointer;
    border: none; padding: 0;
}

/* ── SECTION DIVIDER ──────────────────────── */
.section-divider { height: 1px; background: var(--rule); margin: 2px 0; }

/* ── SETTINGS FOOTER ──────────────────────── */
.settings-footer {
    padding: 12px 14px;
    border-top: 1px solid var(--rule);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}
.settings-footer a {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink3);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color 0.15s;
}
.settings-footer a:hover { color: var(--guide); }

/* ── MOBILE TAB BAR ───────────────────────── */
#mobileTabBar {
    display: none;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: var(--paper);
    border-top: 1px solid var(--rule-strong);
    z-index: 50;
    height: calc(56px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
}
.tab-bar-inner {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    height: 56px;
    width: 100%;
}
.tab-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--ink3);
    font-family: var(--mono);
    transition: color 0.15s;
    padding: 0; width: 100%;
}
.tab-btn svg { width: 20px; height: 20px; display: block; opacity: 0.35; transition: opacity 0.15s; }
.tab-btn span { font-size: 9px; font-weight: 500; line-height: 1; letter-spacing: 0.05em; text-transform: uppercase; }
.tab-btn.active { color: var(--guide); }
.tab-btn.active svg { opacity: 1; }

/* ── UTILITY ──────────────────────────────── */
.btn-loading { opacity: 0.65; pointer-events: none; }

/* ── PRINT ────────────────────────────────── */
@media print {
    nav, #settingsArea, #mobileTabBar, #mobileExportSheet { display: none !important; }
    @page { size: var(--print-width, 210mm) var(--print-height, 297mm); margin: 0 !important; }
    html, body {
        width: var(--print-width, 210mm) !important;
        height: auto !important;
        margin: 0 !important; padding: 0 !important;
        background: white !important;
        background-image: none !important;
        overflow: visible !important;
    }
    main { display: block !important; overflow: visible !important; }
    #previewArea {
        overflow: visible !important; padding: 0 !important;
        display: block !important;
        width: var(--print-width, 210mm) !important;
        margin: 0 !important;
    }
    #previewContainer {
        display: block !important;
        width: var(--print-width, 210mm) !important;
        margin: 0 !important; padding: 0 !important;
        font-size: 0 !important; line-height: 0 !important; gap: 0 !important;
    }
    .page-wrapper {
        display: block !important;
        width: var(--print-width, 210mm) !important;
        height: var(--print-height, 297mm) !important;
        margin: 0 !important; padding: 0 !important;
        box-shadow: none !important; overflow: hidden !important;
        break-inside: avoid !important;
    }
    .page-wrapper + .page-wrapper { break-before: page !important; page-break-before: always !important; }
    .svgPage {
        display: block !important;
        width: var(--print-width, 210mm) !important;
        height: var(--print-height, 297mm) !important;
        margin: 0 !important;
    }
}

/* ── RESPONSIVE ───────────────────────────── */
@media (max-width: 768px) {
    #settingsArea { display: none; }
    #mobileTabBar { display: flex; }
    body { overflow: hidden; padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px)); }
    #previewArea { padding: 16px 12px; }
    #settingsArea.mobile-visible {
        display: flex !important;
        position: fixed;
        inset: var(--nav-h) 0 calc(56px + env(safe-area-inset-bottom, 0px)) 0;
        z-index: 10;
        width: 100%;
        overflow-y: auto;
    }
    #previewArea.mobile-hidden { display: none; }
    .desktop-only { display: none !important; }
}
@media (min-width: 769px) {
    #settingsArea { display: flex; }
}

/* ── INFO BADGE (used by jiugongge, tianzige, etc.) ─────── */
.info-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(var(--ink-rgb),0.06);
    border: 1px solid rgba(var(--ink-rgb),0.2);
    padding: 7px 10px;
}
.info-badge i { color: var(--guide); font-size: 10px; flex-shrink: 0; }
.info-badge span { font-family: var(--mono); font-size: 10px; color: var(--ink2); line-height: 1.5; }

/* ── CHAR INPUT / TEXTAREA (Chinese paper pages) ────────── */
.char-input-wrap { position: relative; }
textarea.form-input {
    resize: none;
    min-height: 68px;
    line-height: 1.6;
    font-family: 'KaiTi', 'STKaiti', 'FangSong', serif;
    font-size: 15px;
    padding-right: 10px;
    background-image: none;
}
.char-count-badge {
    position: absolute;
    bottom: 7px; right: 8px;
    font-family: var(--mono); font-size: 9px;
    color: var(--ink3); pointer-events: none;
}

/* ── CHAR PREVIEW STRIP (Chinese paper pages) ───────────── */
.char-preview-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    min-height: 36px;
    padding: 6px 8px;
    background: var(--bg);
    border: 1px solid var(--rule-strong);
}
.char-chip {
    width: 28px; height: 28px;
    background: var(--paper);
    border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    font-family: 'KaiTi', 'STKaiti', 'FangSong', serif;
    font-size: 15px; color: var(--ink); flex-shrink: 0;
    transition: border-color 0.12s;
}
.char-chip:hover { border-color: var(--guide); }
.char-preview-empty {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--ink3);
    display: flex; align-items: center; font-style: italic;
}

/* ── GUIDE-STYLE-GROUP 2-COL VARIANT (japanese-manuscript) ── */
.guide-style-group.col2 { grid-template-columns: 1fr 1fr; }
/* 4-col variant (sketch, storyboard) */
.guide-style-group.col4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

/* ── SECTION BADGE (tianzige floating corner label) ─────── */
.section-card .section-badge {
    position: absolute; top: -6px; left: 12px;
    background: var(--paper);
    font-family: var(--mono); font-size: 9px;
    color: var(--guide); padding: 0 6px; letter-spacing: 0.1em;
    pointer-events: none;
}

/* ── LAYOUT BUTTON (vocabulary icon picker) ─────────────── */
.layout-btn {
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 9px 6px 7px;
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--ink2);
    cursor: pointer;
    text-align: center;
    transition: all 0.15s;
    text-transform: uppercase;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}
.layout-btn.active { background: var(--ink); color: white; border-color: var(--ink); }
.layout-btn:hover:not(.active) { border-color: var(--guide); color: var(--guide); }
.layout-btn svg { width: 36px; height: 22px; }

/* ── LAYOUT PRESET BUTTONS (error-correction) ─── */
.layout-preset-group {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 6px;
}
.layout-preset-btn {
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 10px 6px 8px;
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--ink2);
    cursor: pointer;
    text-align: center;
    transition: all 0.15s;
    text-transform: uppercase;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}
.layout-preset-btn svg { width: 36px; height: 28px; opacity: 0.5; transition: opacity 0.15s; }
.layout-preset-btn.active { background: var(--ink); color: white; border-color: var(--ink); }
.layout-preset-btn.active svg { opacity: 1; filter: invert(1); }
.layout-preset-btn:hover:not(.active) { border-color: var(--guide); color: var(--guide); }
.layout-preset-btn:hover:not(.active) svg { opacity: 0.8; }

/* ── GUIDE STYLE GROUP 3-COL VARIANT ─────────── */
/* col3 alias — same as default 3-col but named explicitly */
.guide-style-group.col3 { grid-template-columns: 1fr 1fr 1fr; }
/* guide-style-group-3 alias used by study-journal */
.guide-style-group-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }

/* ── SUBJECTS LIST (semester-planner) ────────── */
.subjects-list { display: flex; flex-direction: column; gap: 5px; }
.subject-item { display: flex; align-items: center; gap: 5px; }
.subject-color-dot {
    width: 20px; height: 28px; flex-shrink: 0;
    cursor: pointer; border: 1px solid var(--rule-strong);
}
.subject-input {
    flex: 1;
    background: var(--bg);
    border: 1px solid var(--rule-strong);
    padding: 6px 9px;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 500;
    color: var(--ink);
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    min-width: 0;
}
.subject-input:focus { border-color: var(--guide); box-shadow: 0 0 0 3px rgba(var(--ink-rgb),0.12); }
.subject-input::placeholder { color: var(--ink3); }
.subject-remove-btn {
    width: 26px; height: 26px; flex-shrink: 0;
    background: var(--bg); border: 1px solid var(--rule-strong);
    color: var(--ink3); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 10px; transition: all 0.15s;
}
.subject-remove-btn:hover { background: rgba(var(--ink-rgb),0.08); border-color: var(--guide); color: var(--guide); }
.subject-add-btn {
    background: var(--bg); border: 1px solid var(--rule-strong);
    padding: 7px 10px; font-family: var(--mono); font-size: 10px; font-weight: 600;
    letter-spacing: 0.05em; text-transform: uppercase; color: var(--ink2);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    gap: 6px; width: 100%; transition: all 0.15s; margin-top: 2px;
}
.subject-add-btn:hover { border-color: var(--guide); color: var(--guide); background: rgba(var(--ink-rgb),0.06); }