/*
 * TextTransform: the tool's own components, styled in the site's design language (7 Oct 2026, on the UltraCompress Pro
 * template, after WORKDAYS). Base: /libs/site-pages.css (tokens, Inter and Space Grotesk, buttons, theme toggle, focus
 * rings) and /libs/shared-nav.css (the site's header and footer). This file holds only what the tool itself needs: the
 * toolbar with the status pill, the input and output boxes, the transformation groups with their pill buttons, the find
 * and replace row with its switches, the statistics tiles, the frequency bars, the toasts and the information sections.
 * Light is the default; dark applies when <html> has no data-theme.
 */

/* ----- Tokens the tool adds ----- */
:root {
    --surface: #ffffff;
    --surface-2: #f3f4f8;
    --ring: rgba(139, 92, 246, 0.18);
    --app-max: 1600px;
    --radius-lg: 16px;
}
:root:not([data-theme="light"]) {
    --surface: #14141f;
    --surface-2: rgba(255, 255, 255, 0.05);
}

/* ----- Page: full width, the page provides the side space ----- */
.container.app-container { max-width: calc(var(--app-max) + 2 * var(--content-gutter)); margin-top: 16px; }
@media (min-width: 640px) { .container.app-container { margin-top: 24px; } }

/* ----- Tools back link above the header, as on every other tool ----- */
body { padding-top: 0; }
.back-bar { height: 48px; display: flex; align-items: center; padding: 0 var(--zdu-gutter, 24px); }
body > header { position: sticky; top: 0; z-index: 50; }
header .site-nav { position: relative; top: auto; }
.theme-toggle { top: calc(90px + var(--bar-offset, 48px)); }
@media (max-width: 768px) { .theme-toggle { top: calc(75px + var(--bar-offset, 48px)); } }
.hidden-input { display: none; }

/* ----- Hero ----- */
.app-hero { margin: 0 0 2rem; text-align: center; }
.app-brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 1.25rem; font-family: 'Space Grotesk', 'Inter', sans-serif; font-weight: 700; font-size: 1.1rem; color: var(--text-strong); }
.app-brand img { width: 44px; height: 44px; border-radius: 12px; display: block; }
.app-hero h1 { margin-bottom: 0.75rem; }
.app-tagline { color: var(--text-2); font-size: 1.125rem; line-height: 1.6; max-width: 46rem; margin: 0 auto; }

/* ----- Buttons ----- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 9999px; font-family: inherit; font-weight: 600; font-size: 0.95rem; line-height: 1.2; padding: 12px 24px; cursor: pointer; text-decoration: none; white-space: nowrap; transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, color 0.2s ease, background 0.2s ease; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.btn-primary { background: var(--gradient-brand); color: #fff; box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3); }
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--text-strong); border: 1px solid var(--surface-border); padding: 11px 23px; }
.btn-secondary:hover:not(:disabled) { border-color: var(--brand); color: var(--link); transform: translateY(-2px); }
.btn-danger { background: var(--surface); color: var(--danger); border: 1px solid rgba(185, 28, 28, 0.35); padding: 11px 23px; }
.btn-danger:hover:not(:disabled) { background: var(--danger-strong); color: #fff; border-color: transparent; transform: translateY(-2px); }
.btn-sm { font-size: 0.85rem; padding: 9px 16px; }
.btn-secondary.btn-sm, .btn-danger.btn-sm { padding: 8px 15px; }
.btn-icon.btn-sm { width: 38px; height: 38px; padding: 0; }
.btn-icon.btn-sm svg { width: 17px; height: 17px; }
.btn-stack { display: flex; flex-wrap: wrap; gap: 8px; }
.btn-stack--top { margin-top: 14px; }

/* ----- Toolbar ----- */
.app-shell { margin: 0 0 3rem; scroll-margin-top: 90px; }
.app-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; margin: 0 0 1.25rem; }
.toolbar-left, .toolbar-right { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.status-pill { display: inline-flex; align-items: center; gap: 10px; padding: 6px 16px 6px 10px; border-radius: 9999px; border: 1px solid var(--tint-brand-border); background: var(--tint-brand); min-width: 220px; max-width: 100%; }
.status-icon { font-size: 1.3rem; line-height: 1; }
.status-text { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.status-main { font-weight: 700; font-size: 0.85rem; color: var(--text-strong); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.status-sub { font-size: 0.72rem; color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.shell-hint { margin-top: 14px; }
kbd { font-family: inherit; font-size: 0.72rem; font-weight: 700; padding: 1px 6px; border-radius: 6px; border: 1px solid var(--chip-border); background: var(--chip); color: var(--text-strong); }

/* ----- Cards ----- */
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-bottom: 20px; }
.card-grid--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card--wide { grid-column: span 2; }
.card-grid--three .card, .card-grid--two .card { grid-column: auto; }
.card { background: var(--surface); border: 1px solid var(--surface-border); border-radius: var(--radius-lg); box-shadow: var(--surface-shadow); overflow: hidden; display: flex; flex-direction: column; min-width: 0; margin-bottom: 0; }
.app-shell > .card { margin-bottom: 20px; }
.card-header { padding: 14px 20px; border-bottom: 1px solid var(--surface-border); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.card-title { margin: 0; font-size: 1.05rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.card-note { font-size: 0.8125rem; color: var(--text-3); }
.card-body { padding: 16px 20px 20px; flex: 1; }
.sub-title { font-size: 0.95rem; font-weight: 700; margin: 18px 0 8px; color: var(--text-strong); }
.form-hint { font-size: 0.78rem; color: var(--text-3); margin: 10px 0 0; line-height: 1.5; }

/* ----- Forms ----- */
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-bottom: 14px; }
.form-row--tight { grid-template-columns: minmax(0, 1fr) 130px; }
.form-group { margin-bottom: 14px; min-width: 0; }
.form-row .form-group { margin-bottom: 0; }
.form-group:last-child { margin-bottom: 0; }
.form-label { display: block; margin-bottom: 6px; font-size: 0.85rem; font-weight: 600; color: var(--text-strong); }
.form-input { width: 100%; min-width: 0; padding: 10px 14px; background: var(--field); border: 1px solid var(--field-border); border-radius: 12px; font-family: inherit; font-size: 0.95rem; color: var(--text); outline: none; transition: border-color 0.2s ease, box-shadow 0.2s ease; }
.form-input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--ring); }
.form-input::placeholder { color: var(--placeholder); }
select.form-input { appearance: none; -webkit-appearance: none; padding-right: 36px; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; background-size: 14px; cursor: pointer; }
select.form-input option { color: #0a0a14; background: #fff; }
.choice-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.choice-btn { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 9999px; border: 1px solid var(--chip-border); background: var(--surface); font-family: inherit; font-size: 0.85rem; font-weight: 600; color: var(--text-2); cursor: pointer; transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease; }
.choice-btn--sm { padding: 7px 13px; font-size: 0.8rem; }
.choice-btn:hover:not(:disabled) { border-color: var(--brand); color: var(--link); transform: translateY(-1px); }
.choice-btn[aria-checked="true"], .choice-btn[aria-pressed="true"] { background: var(--gradient-brand); color: #fff; border-color: transparent; }
.choice-btn:disabled { cursor: default; opacity: 0.7; }
.choice-btn:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

/* ----- Input and output ----- */
.text-box { width: 100%; min-height: 260px; resize: vertical; padding: 14px 16px; background: var(--field); border: 1px solid var(--field-border); border-radius: 12px; font-family: inherit; font-size: 0.95rem; line-height: 1.55; color: var(--text); outline: none; transition: border-color 0.2s ease, box-shadow 0.2s ease; }
.text-box:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--ring); }
.text-box.drag-over { border-color: var(--brand); background: var(--tint-brand); }
.text-box::placeholder { color: var(--placeholder); }
.text-box--output { background: var(--surface-2); }

/* ----- Transformations ----- */
.group-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 28px; }
.transform-group { min-width: 0; }
.group-title { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); margin: 0 0 10px; }
.group-title--spaced { margin-top: 22px; }
.transform-group .choice-row { margin-bottom: 0; }
.replace-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto; gap: 14px; align-items: start; margin-bottom: 12px; }
.replace-row .form-group { margin-bottom: 0; }
.replace-actions { padding-top: 26px; }
.find-count { display: block; min-height: 1.2em; margin-top: 6px; }
.find-count.is-error { color: var(--danger); }
.option-row { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-bottom: 4px; }
.option-row--tight { margin-bottom: 12px; }
.option { display: inline-flex; align-items: center; gap: 10px; border: 0; background: none; padding: 4px 0; font-family: inherit; font-size: 0.85rem; font-weight: 600; color: var(--text-strong); cursor: pointer; text-align: left; }
.option:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 8px; }
.toggle { position: relative; display: inline-block; width: 40px; height: 22px; flex-shrink: 0; border-radius: 9999px; background: var(--chip-border); transition: background 0.2s ease; }
.toggle .toggle-knob { position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3); transition: transform 0.2s ease; }
.option[aria-checked="true"] .toggle { background: var(--gradient-brand); }
.option[aria-checked="true"] .toggle .toggle-knob { transform: translateX(18px); }

/* ----- Statistics and frequency ----- */
.stat-tiles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.stat-tile { background: var(--surface-2); border: 1px solid var(--surface-border); border-radius: 12px; padding: 12px 10px; text-align: center; display: flex; flex-direction: column; gap: 2px; border-top: 3px solid var(--brand); }
.stat-num { font-family: 'Space Grotesk', 'Inter', sans-serif; font-size: 1.4rem; font-weight: 700; color: var(--text-strong); font-variant-numeric: tabular-nums; line-height: 1.1; }
.stat-label { font-size: 0.72rem; color: var(--text-3); line-height: 1.3; }
.freq-list { display: flex; flex-direction: column; gap: 6px; }
.freq-row { display: grid; grid-template-columns: 64px minmax(0, 1fr) 92px; align-items: center; gap: 10px; font-size: 0.82rem; }
.freq-key { font-family: 'Space Grotesk', 'Inter', monospace; font-weight: 700; color: var(--text-strong); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.freq-bar { height: 10px; border-radius: 5px; background: var(--surface-2); overflow: hidden; }
.freq-bar i { display: block; height: 100%; border-radius: 5px; background: var(--gradient-brand); }
.freq-count { font-size: 0.75rem; color: var(--text-3); text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.list-empty { color: var(--text-3); font-size: 0.875rem; margin: 0; padding: 10px 0; line-height: 1.5; }

/* ----- Toasts ----- */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 3000; display: flex; flex-direction: column; gap: 10px; max-width: calc(100vw - 32px); }
.toast { background: #0a0a14; color: #fff; border: 1px solid rgba(255, 255, 255, 0.12); border-left: 4px solid var(--brand); border-radius: 14px; padding: 12px 16px; display: flex; align-items: center; gap: 12px; box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3); min-width: 260px; max-width: 400px; font-size: 0.875rem; font-weight: 500; overflow-wrap: anywhere; animation: slideIn 0.3s ease; transition: opacity 0.3s ease, transform 0.3s ease; }
.toast-icon { font-size: 0.95rem; font-weight: 700; line-height: 1; width: 22px; height: 22px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: rgba(255, 255, 255, 0.12); flex-shrink: 0; }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.toast.success { border-left-color: #4ade80; } .toast.error { border-left-color: #f87171; } .toast.warning { border-left-color: #fbbf24; } .toast.info { border-left-color: #38bdf8; }
.toast.leaving { opacity: 0; transform: translateX(40px); }

/* ----- Information sections ----- */
.info-section { margin: 0 0 2.5rem; }
.info-section h2 { font-size: 1.75rem; margin: 0 0 1.25rem; }
.info-section .info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.info-three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 1rem 0 1.5rem; }
.info-stack { display: grid; gap: 12px; }
.info-card { background: var(--surface); border: 1px solid var(--surface-border); border-radius: 16px; box-shadow: var(--surface-shadow); padding: 20px; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.info-card:hover { transform: translateY(-4px); box-shadow: var(--surface-hover-shadow); }
.info-card--small { padding: 16px; box-shadow: none; }
.info-card h3 { margin: 0 0 0.75rem; font-size: 1.15rem; }
.info-card p { color: var(--text-2); margin-bottom: 0.75rem; }
.info-card p:last-child { margin-bottom: 0; }
.step-card { position: relative; padding-top: 24px; }
.step-num { position: absolute; top: -16px; left: 20px; width: 34px; height: 34px; border-radius: 50%; background: var(--gradient-brand); color: #fff; font-weight: 700; font-size: 0.95rem; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3); }
.step-head { display: flex; align-items: center; gap: 12px; margin-bottom: 0.75rem; }
.step-head h3 { margin: 0; }
.step-emoji { font-size: 1.6rem; line-height: 1; }
.info-section details.info-card { padding: 0; }
.info-section details.info-card summary { cursor: pointer; padding: 16px 20px; font-weight: 600; color: var(--text-strong); list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.info-section details.info-card summary::-webkit-details-marker { display: none; }
.info-section details.info-card summary::after { content: '+'; color: var(--link); font-weight: 700; font-size: 1.2rem; line-height: 1; flex-shrink: 0; }
.info-section details.info-card[open] summary::after { content: '\2212'; }
.info-section details.info-card p { padding: 0 20px 16px; margin: 0; color: var(--text-2); }

/* ----- Tablets ----- */
@media (max-width: 1023px) {
    .card-grid, .card-grid--two { grid-template-columns: 1fr; }
    .card--wide { grid-column: auto; }
    .group-grid { grid-template-columns: 1fr; }
    .info-section .info-grid { grid-template-columns: repeat(2, 1fr); }
    .info-three { grid-template-columns: 1fr; }
}

/* ----- Phones ----- */
@media (max-width: 639px) {
    .app-hero { margin-bottom: 1.5rem; }
    .app-tagline { font-size: 1rem; }
    .app-toolbar { gap: 10px; }
    .toolbar-left, .toolbar-right { width: 100%; }
    .status-pill { flex: 1; min-width: 0; }
    .toolbar-right .btn { flex: 1 1 auto; }
    .card-grid, .card-grid--two { gap: 14px; margin-bottom: 14px; }
    .app-shell > .card { margin-bottom: 14px; }
    .card-header { padding-left: 16px; padding-right: 16px; }
    .card-body { padding: 14px 16px 16px; }
    .text-box { min-height: 200px; }
    .replace-row { grid-template-columns: 1fr; }
    .replace-actions { padding-top: 0; }
    .freq-row { grid-template-columns: 52px minmax(0, 1fr) 78px; }
    .toast-container { bottom: 16px; right: 16px; left: 16px; align-items: flex-end; }
    .toast { min-width: 0; }
    .info-section h2 { font-size: 1.4rem; }
    .info-section .info-grid, .info-three { grid-template-columns: 1fr; }
    .info-card { padding: 16px; }
    .step-num { left: 16px; }
}

@media (prefers-reduced-motion: reduce) {
    .btn, .info-card, .toast, .choice-btn, .toggle, .toggle .toggle-knob, .text-box { transition: none; animation: none; }
}

/* Phones: 16 px text, 44 px tap targets (AdSense audit H-04, 8 Oct 2026) */
@media (max-width: 639.98px) {
    main button, main select, main summary, main [role="button"],
    main input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]):not([type="file"]) { min-height: 44px; }
    div#charFreqList.freq-list > p.list-empty,
    div#wordFreqList.freq-list > p.list-empty,
    div.card-body > p.form-hint { font-size: 1rem; }
}