/*!
 * qr.novice.tw — 白底 + 黑色系元件
 * 新手村系列排版基準：容器 max-width 1200px、Bootstrap 4.5.2 網格
 * 設計原則：頁面底色純白，導覽列 / 卡片 / 按鈕 / 頁尾走黑色系
 * 注意：此檔不影響 QR Code 對比度計算，產生器的 fg/bg 色票完全獨立
 */

/* ===== 設計權杖 ===== */
:root {
    /* 頁面基底：白 */
    --bg-base:    #ffffff;
    --bg-surface: #ffffff;
    --bg-raised:  #f7f8f9;
    --bg-input:   #ffffff;
    --bg-hover:   #f2f3f5;

    /* 黑色系元件層 */
    --ink:        #16181d;
    --ink-soft:   #1f232b;
    --ink-hover:  #2b2f38;
    --ink-border: #2c313b;
    --ink-text:   #f2f3f5;
    --ink-muted:  #a6adba;
    --ink-faint:  #737b88;

    --border:        #e4e6e9;
    --border-strong: #cfd2d7;

    --text-primary:   #16181d;
    --text-secondary: #5b6270;
    --text-tertiary:  #8b929e;

    /* 互動：以黑為主色（白底上的專業單色） */
    --accent:       #16181d;
    --accent-hover: #2b2f38;
    --accent-fg:    #ffffff;
    --focus-ring:   rgba(22, 24, 29, .18);

    --ok:   #15803d;
    --warn: #b45309;
    --err:  #b91c1c;
    --ok-bg:   #f0fdf4;
    --warn-bg: #fffbeb;
    --err-bg:  #fef2f2;
    --info-bg: #f7f8f9;

    --radius: 10px;
    --radius-sm: 6px;
}

/* ===== 基礎 ===== */
html { -webkit-text-size-adjust: 100%; }

body {
    font-family: 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    padding-top: 62px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 新手村基準寬度：與 spa.novice.tw 一致
   spa 使用 Bootstrap 4 的 xl 斷點預設值 1140px，
   這裡明確寫出以確保跨 Bootstrap 版本一致。
   注意：只覆寫「大螢幕」的上限，不可蓋掉 Bootstrap 原有的
   響應式斷點（否則 1024px 以下會失去左右 padding） */
@media (min-width: 1200px) {
    .container { max-width: 1140px; }
}

a { color: var(--text-primary); }
a:hover { color: var(--accent-hover); }
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

hr { border-top-color: var(--border); }
::selection { background: rgba(22, 24, 29, .12); color: var(--text-primary); }

* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 6px;
    border: 2px solid var(--bg-base);
}
*::-webkit-scrollbar-thumb:hover { background: #b3b8c0; }

/* ===== 導覽列（黑色系）===== */
.navbar.novice-nav {
    background-color: var(--ink) !important;
    border-bottom: 1px solid var(--ink-border);
    box-shadow: none;
    min-height: 62px;
    padding-top: .4rem;
    padding-bottom: .4rem;
}
.navbar.novice-nav .navbar-brand {
    font-weight: 700;
    color: var(--ink-text);
    display: flex;
    align-items: center;
    letter-spacing: .01em;
}
.navbar.novice-nav .navbar-brand i {
    font-size: 1.2em;
    margin-right: .5rem;
    color: var(--ink-text);
}
.navbar.novice-nav .nav-link {
    color: var(--ink-muted) !important;
    transition: color .18s ease;
    font-size: .93rem;
    padding-left: .62rem;
    padding-right: .62rem;
}
.navbar.novice-nav .nav-link i { opacity: .75; margin-right: .15rem; }
.navbar.novice-nav .nav-link:hover,
.navbar.novice-nav .nav-link:focus { color: var(--ink-text) !important; }
.navbar.novice-nav .nav-link:hover i { opacity: 1; }
.navbar.novice-nav .nav-link.active {
    color: var(--ink-text) !important;
    font-weight: 500;
    position: relative;
}
.navbar.novice-nav .nav-link.active::after {
    content: "";
    position: absolute;
    left: .62rem;
    right: .62rem;
    bottom: -2px;
    height: 2px;
    background: var(--ink-text);
    border-radius: 2px;
}
.navbar.novice-nav .navbar-toggler {
    border-color: var(--ink-border);
    padding: .3rem .5rem;
}
.navbar.novice-nav .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='%23a6adba' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.navbar.novice-nav .navbar-toggler:focus { outline: 2px solid rgba(255, 255, 255, .3); }

/* ===== 卡片 / 面板（白卡 + 黑標頭）===== */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: none;
    color: var(--text-primary);
}
/* 圓角裁切（只裁標頭，避免用 overflow:hidden 破壞子元素的 position:sticky） */
.card > .card-header:first-child {
    border-top-left-radius: calc(var(--radius) - 1px);
    border-top-right-radius: calc(var(--radius) - 1px);
}
.card > .card-body:last-child,
.card > .card-footer:last-child {
    border-bottom-left-radius: calc(var(--radius) - 1px);
    border-bottom-right-radius: calc(var(--radius) - 1px);
}
.card-body { color: var(--text-primary); }
.card-header {
    background-color: var(--ink);
    border-bottom: 1px solid var(--ink-border);
    color: var(--ink-text);
    font-weight: 500;
}
.card-header a,
.card-header a .text-primary,
.card-header .text-primary,
.card-header .h6,
.card-header h2,
.card-header h3,
.card-header [class*="text-"] { color: var(--ink-text) !important; }
.card-header .text-muted,
.card-header small { color: var(--ink-muted) !important; }
.card-header i,
.card-header [class*="text-"] i { color: var(--ink-muted) !important; }
.card-header .fa-times,
.card-header .close { color: var(--ink-text); }
.card-footer {
    background-color: var(--bg-raised);
    border-top: 1px solid var(--border);
}
/* 首頁主視覺：黑底白字 */
.jumbotron {
    background-color: var(--ink) !important;
    border: 1px solid var(--ink-border);
    border-radius: var(--radius) !important;
    box-shadow: none !important;
    color: var(--ink-text);
}
.jumbotron h1, .jumbotron .h3, .jumbotron .lead { color: var(--ink-text); }
.jumbotron .lead { color: var(--ink-muted); }
.jumbotron .badge-secondary {
    background-color: var(--ink-soft) !important;
    color: var(--ink-text) !important;
    border-color: var(--ink-border) !important;
}
.jumbotron .btn-primary {
    background-color: #ffffff;
    border-color: #ffffff;
    color: var(--ink) !important;
}
.jumbotron .btn-primary:hover {
    background-color: #e8eaee;
    border-color: #e8eaee;
    color: var(--ink) !important;
}
.jumbotron .btn-outline-primary,
.jumbotron .btn-outline-secondary {
    background-color: transparent;
    border-color: rgba(255, 255, 255, .3);
    color: var(--ink-text);
}
.jumbotron .btn-outline-primary:hover,
.jumbotron .btn-outline-secondary:hover {
    background-color: rgba(255, 255, 255, .1);
    border-color: rgba(255, 255, 255, .55);
    color: #ffffff;
}

/* ===== 文字工具類覆寫 ===== */
.text-muted { color: var(--text-secondary) !important; }
.text-dark  { color: var(--text-primary) !important; }
.text-primary,
.text-info,
.text-warning,
.text-success,
.text-danger { color: var(--text-primary) !important; }
.text-primary i,
.text-info i,
.text-warning i,
.text-success i,
.text-danger i,
.text-dark i { color: var(--text-tertiary) !important; }
.text-ok    { color: var(--ok) !important; }
.text-warn  { color: var(--warn) !important; }
.text-error { color: var(--err) !important; }
.text-mono-muted { color: var(--text-tertiary) !important; }

h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    color: var(--text-primary);
    font-weight: 700;
}
.lead { color: var(--text-secondary); }

/* ===== 按鈕（單色系）===== */
.btn { border-radius: var(--radius-sm); transition: all .18s ease; font-weight: 500; }
.btn.focus, .btn:focus { box-shadow: 0 0 0 3px var(--focus-ring); }

.btn-primary,
.btn-info,
.btn-success,
.btn-warning,
.btn-danger,
.btn-dark {
    background-color: var(--accent);
    border-color: var(--accent);
    color: var(--accent-fg) !important;
}
.btn-primary:hover,
.btn-info:hover,
.btn-success:hover,
.btn-warning:hover,
.btn-danger:hover,
.btn-dark:hover,
.btn-primary:not(:disabled):not(.disabled):active,
.btn-info:not(:disabled):not(.disabled):active,
.btn-dark:not(:disabled):not(.disabled):active {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    color: var(--accent-fg) !important;
}
.btn-primary:disabled, .btn-dark:disabled { opacity: .4; }

.btn-outline-primary,
.btn-outline-info,
.btn-outline-success,
.btn-outline-warning,
.btn-outline-danger,
.btn-outline-secondary,
.btn-outline-dark {
    color: var(--text-primary);
    border-color: var(--border-strong);
    background-color: #ffffff;
}
.btn-outline-primary:hover,
.btn-outline-info:hover,
.btn-outline-success:hover,
.btn-outline-warning:hover,
.btn-outline-danger:hover,
.btn-outline-secondary:hover,
.btn-outline-dark:hover,
.btn-outline-primary:not(:disabled):not(.disabled):active,
.btn-outline-secondary:not(:disabled):not(.disabled):active {
    background-color: var(--bg-hover);
    border-color: var(--text-tertiary);
    color: var(--text-primary);
}
.btn-secondary { background-color: var(--bg-hover); border-color: var(--border-strong); color: var(--text-primary); }
.btn-secondary:hover { background-color: #e8eaee; border-color: var(--text-tertiary); color: var(--text-primary); }
.btn-link { color: var(--text-primary); text-decoration: underline; text-underline-offset: 3px; }
.btn-link:hover { color: var(--accent-hover); }

.btn-group .btn { border-radius: 0; }
.btn-group .btn:first-child { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.btn-group .btn:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }

/* ===== 表單 ===== */
.form-control,
.custom-select {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    transition: border-color .18s ease, box-shadow .18s ease;
}
.form-control:focus,
.custom-select:focus {
    background-color: var(--bg-input);
    border-color: var(--text-tertiary);
    color: var(--text-primary);
    box-shadow: 0 0 0 3px var(--focus-ring);
}
.form-control::placeholder { color: var(--text-tertiary); }
.form-control:disabled,
.form-control[readonly] { background-color: var(--bg-raised); color: var(--text-secondary); }
.custom-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3e%3cpath fill='%235b6270' d='M2 0L0 2h4zM2 5L0 3h4z'/%3e%3c/svg%3e");
}
input[type="color"].form-control { padding: .2rem; height: 38px; }
input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
input[type="color"]::-webkit-color-swatch { border: 1px solid var(--border-strong); border-radius: 4px; }

label, .col-form-label, .form-check-label { color: var(--text-secondary); }
.form-text { color: var(--text-tertiary) !important; }
.form-check-input { background-color: #ffffff; border-color: var(--border-strong); }
.custom-control-input:checked ~ .custom-control-label::before {
    background-color: var(--accent);
    border-color: var(--accent);
}
.custom-control-label::before { background-color: #ffffff; border-color: var(--border-strong); }
.custom-control-input:focus ~ .custom-control-label::before { box-shadow: 0 0 0 3px var(--focus-ring); }
.custom-file-label,
.input-group-text {
    background-color: var(--bg-raised);
    border-color: var(--border);
    color: var(--text-secondary);
}
.custom-file-input:focus ~ .custom-file-label { border-color: var(--text-tertiary); box-shadow: 0 0 0 3px var(--focus-ring); }

/* ===== 表格 ===== */
.table { color: var(--text-primary); }
.table td, .table th { border-top-color: var(--border); }
.table thead th {
    border-bottom-color: var(--border);
    color: var(--text-secondary);
    font-weight: 700;
    font-size: .84rem;
    letter-spacing: .03em;
    text-transform: uppercase;
    background-color: var(--bg-raised);
}
.table-bordered, .table-bordered td, .table-bordered th { border-color: var(--border); }
.thead-light th,
thead.thead-light th { background-color: var(--bg-raised); border-bottom-color: var(--border); color: var(--text-secondary); }
.table-hover tbody tr:hover { background-color: var(--bg-hover); color: var(--text-primary); }
.table-sm td, .table-sm th { padding: .45rem .5rem; }
.table code, code {
    color: var(--text-primary);
    background-color: var(--bg-raised);
    padding: .1em .35em;
    border-radius: 4px;
}
pre {
    background-color: var(--bg-raised);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 1rem;
}

/* ===== 提示框 ===== */
.alert {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background-color: var(--bg-raised);
    color: var(--text-primary);
}
.alert-warning { background-color: var(--warn-bg); border-color: #fde68a; color: #92400e; }
.alert-danger  { background-color: var(--err-bg);  border-color: #fecaca; color: #991b1b; }
.alert-success { background-color: var(--ok-bg);   border-color: #bbf7d0; color: #166534; }
.alert-info    { background-color: var(--info-bg); border-color: var(--border); color: var(--text-secondary); }
.alert-warning a, .alert-danger a, .alert-success a, .alert-info a { color: inherit; text-decoration: underline; }
.alert-heading { color: inherit; }

/* ===== 徽章 ===== */
.badge { font-weight: 500; border-radius: 4px; padding: .35em .55em; font-size: .76em; }
.badge-primary, .badge-info, .badge-success, .badge-warning,
.badge-danger, .badge-dark, .badge-secondary, .badge-light {
    background-color: var(--bg-raised) !important;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border-strong);
}
.badge-ok    { background-color: var(--ok-bg) !important;   color: #166534 !important; border: 1px solid #bbf7d0; }
.badge-warn  { background-color: var(--warn-bg) !important; color: #92400e !important; border: 1px solid #fde68a; }
.badge-error { background-color: var(--err-bg) !important;  color: #991b1b !important; border: 1px solid #fecaca; }

/* ===== 清單群組 ===== */
.list-group-item {
    background-color: var(--bg-surface);
    border-color: var(--border);
    color: var(--text-primary);
}
.list-group-item:hover { background-color: var(--bg-hover); color: var(--text-primary); }
.list-group-item.disabled, .list-group-item:disabled { background-color: var(--bg-raised); color: var(--text-tertiary); }

/* ===== 下拉選單 ===== */
.dropdown-menu {
    background-color: #ffffff;
    border: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(16, 18, 22, .10);
}
.dropdown-item { color: var(--text-secondary); }
.dropdown-item:hover, .dropdown-item:focus { background-color: var(--bg-hover); color: var(--text-primary); }
.dropdown-divider { border-top-color: var(--border); }

/* ===== 分頁 / 進度條 ===== */
.page-link { background-color: #ffffff; border-color: var(--border); color: var(--text-secondary); }
.page-link:hover { background-color: var(--bg-hover); border-color: var(--border-strong); color: var(--text-primary); }
.page-item.active .page-link { background-color: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.page-item.disabled .page-link { background-color: #ffffff; border-color: var(--border); color: var(--text-tertiary); }
.progress { background-color: var(--bg-hover); border-radius: 999px; }
.progress-bar { background-color: var(--accent); color: var(--accent-fg); }

/* ===== 模態框 ===== */
.modal-content { background-color: #ffffff; border: 1px solid var(--border); color: var(--text-primary); }
.modal-header, .modal-footer { border-color: var(--border); }
.close { color: var(--text-secondary); text-shadow: none; opacity: .8; }
.close:hover { color: var(--text-primary); opacity: 1; }

/* ===== 頁尾（黑色系）===== */
.footer {
    background-color: var(--ink) !important;
    border-top: 1px solid var(--ink-border);
    color: var(--ink-muted);
    margin-top: 4rem;
}
.footer h2, .footer .h6 { color: var(--ink-text); font-size: .95rem; }
.footer a {
    text-decoration: none;
    color: var(--ink-muted);
    transition: color .18s ease;
    /* 無障礙：確保足夠的觸控目標高度（建議 ≥44px） */
    display: inline-block;
    padding: .35rem 0;
    min-height: 30px;
    line-height: 1.5;
}
.footer a:hover { color: #ffffff; }
.footer ul.list-unstyled > li { margin-bottom: .15rem; }
.footer .footer-links { font-size: .875rem; }
.footer .footer-links li { margin-bottom: .1rem; }
.footer .footer-links a {
    padding: .3rem 0;
    min-height: 28px;
    display: inline-block;
}
.footer .footer-legal { font-size: .82rem; }
.footer .footer-legal a {
    padding: .25rem .1rem;
    min-height: 26px;
    display: inline-block;
}
.footer .text-muted { color: var(--ink-faint) !important; }
.footer .border-top { border-top-color: var(--ink-border) !important; }

/* 頁尾流量計數器（黑底配色）
   counter.js 會動態插入 #counter-content 並用 Bootstrap 預設色，
   這裡統一覆寫成淺色，確保黑底上可讀 */
.footer-counter {
    color: var(--ink-muted);
    font-size: .82rem;
    line-height: 1.9;
}
.footer-counter.border-top { border-top-color: var(--ink-border) !important; }
.footer-counter #counter-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: .25rem .5rem;
    color: var(--ink-muted);
}
.footer-counter #counter-content > span {
    margin-right: 0 !important;
    color: var(--ink-muted);
    white-space: nowrap;
}
/* 數值：白字、等寬數字 */
.footer-counter #counter-content span[id] {
    color: var(--ink-text) !important;
    font-variant-numeric: tabular-nums;
}
/* 線上人數用綠色點綴，其餘 emoji 保持原色 */
.footer-counter #counter-content #online-number { color: #6ee7a8 !important; }
.footer-counter #counter-content #total-count { color: var(--ink-text) !important; }

/* ===== QR 預覽區（棋盤格底，方便檢視透明 PNG）===== */
.qr-preview-box {
    background:
        repeating-conic-gradient(#f7f8f9 0% 25%, #ffffff 0% 50%) 50% / 18px 18px;
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    min-height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color .18s ease, background-color .18s ease;
}
.qr-preview-box img,
.qr-preview-box canvas {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 0 0 1px var(--border);
}

/* 掃描 / 診斷用的影像畫布 */
.scan-stage,
.diagnose-stage {
    background-color: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

/* ===== 麵包屑 ===== */
.breadcrumb-bar { background: transparent; padding: 0; margin: 0 0 .75rem 0; font-size: 13px; }
.breadcrumb-bar .breadcrumb { background: transparent; padding: 0; margin: 0; }
.breadcrumb-bar .breadcrumb-item a { color: var(--text-tertiary); text-decoration: none; }
.breadcrumb-bar .breadcrumb-item a:hover { color: var(--text-primary); }
.breadcrumb-bar .breadcrumb-item.active { color: var(--text-secondary); }
.breadcrumb-bar .breadcrumb-item + .breadcrumb-item::before { content: "›"; color: var(--text-tertiary); }

/* ===== 常見問題手風琴 ===== */
details.faq-item { border-bottom: 1px solid var(--border); padding: .85rem 0; }
details.faq-item:last-of-type { border-bottom: 0; }
details.faq-item summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    list-style: none;
    transition: color .18s ease;
}
details.faq-item summary:hover { color: var(--accent-hover); }
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::before {
    content: "\f054";
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    font-size: .7em;
    color: var(--text-tertiary);
    margin-right: .6rem;
    display: inline-block;
    transition: transform .2s;
}
details.faq-item[open] summary::before { transform: rotate(90deg); color: var(--text-primary); }
details.faq-item .faq-answer { padding-top: .6rem; color: var(--text-secondary); font-size: 14px; line-height: 1.75; }
details.faq-item .faq-answer a { color: var(--text-primary); text-decoration: underline; text-underline-offset: 3px; }

/* ===== 首頁試掃範例 ===== */
.demo-section {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--bg-raised);
    padding: 1.25rem 1.25rem .25rem;
    margin-bottom: 1.5rem;
}
.demo-section > .section-title { margin-bottom: .35rem; }
.demo-section .demo-intro {
    color: var(--text-secondary);
    font-size: .9rem;
    margin-bottom: 1.1rem;
    max-width: 62em;
}
.demo-section .demo-intro kbd {
    background-color: #ffffff;
    border: 1px solid var(--border-strong);
    border-bottom-width: 2px;
    border-radius: 4px;
    color: var(--text-primary);
    font-size: .85em;
    padding: 1px 5px;
}

.demo-card { overflow: hidden; }

/* 範例圖面：棋盤格底讓白色靜區邊界可見 */
.demo-canvas-wrap {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 208px;
    padding: 18px;
    background:
        repeating-conic-gradient(#f7f8f9 0% 25%, #ffffff 0% 50%) 50% / 18px 18px;
    border-bottom: 1px solid var(--border);
}
.demo-canvas {
    width: auto;
    max-width: 168px;
    max-height: 168px;
    height: auto;
    display: block;
    border-radius: 6px;
    box-shadow: 0 0 0 1px var(--border), 0 2px 8px rgba(22, 24, 29, .07);
    background-color: #ffffff;
}
.demo-canvas-bc {
    max-width: 100%;
    max-height: 108px;
    border-radius: 4px;
}

/* 徽章 */
.demo-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 2;
    background-color: var(--ink);
    color: var(--ink-text);
    font-size: .68rem;
    font-weight: 500;
    letter-spacing: .04em;
    padding: 3px 9px;
    border-radius: 999px;
    line-height: 1.5;
}

/* 載入中 */
.demo-spinner {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 1.4rem;
}
.demo-canvas-wrap.is-ready .demo-spinner { display: none; }

/* 規格清單 */
.demo-meta { margin-bottom: 0; color: var(--text-secondary); line-height: 1.85; }
.demo-meta li { display: flex; align-items: baseline; gap: .45rem; }
.demo-meta i {
    color: var(--ok);
    font-size: .7rem;
    flex: 0 0 auto;
    transform: translateY(-1px);
}

/* 內容摘要 */
.demo-content {
    background-color: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: .45rem .6rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .76rem;
    word-break: break-all;
    line-height: 1.6;
}
.demo-content i { color: var(--text-tertiary); margin-right: .3rem; }

/* 動作列 */
.demo-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
    flex-wrap: wrap;
}
.demo-actions .btn-link {
    color: var(--text-secondary);
    font-size: .8rem;
    padding: .25rem .3rem;
    text-decoration: none;
}
.demo-actions .btn-link:hover { color: var(--text-primary); }
.demo-actions .btn:disabled { opacity: .8; }

/* 手機：縮小圖面高度，避免卡片過高 */
@media (max-width: 575px) {
    .demo-section { padding: 1rem 1rem .25rem; }
    .demo-canvas-wrap { min-height: 176px; padding: 14px; }
    .demo-canvas { max-width: 148px; max-height: 148px; }
    .demo-canvas-bc { max-height: 92px; }
}

/* ===== 版面輔助 ===== */
.section-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.section-title i { color: var(--text-tertiary); }

.surface-sunken { background-color: var(--bg-raised); border: 1px solid var(--border); border-radius: var(--radius-sm); }

.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--text-primary); font-variant-numeric: tabular-nums; }
.stat-label { font-size: .78rem; color: var(--text-tertiary); letter-spacing: .02em; }

.card.tool-card { transition: border-color .2s ease, transform .2s ease; }
.card.tool-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }

/* ===== Bootstrap 殘留處理 ===== */
.bg-white { background-color: #ffffff !important; }
.bg-light { background-color: var(--bg-raised) !important; }
.bg-dark  { background-color: #1f232b !important; }
.border-top, .border-bottom, .border { border-color: var(--border) !important; }

/* ===== 響應式 ===== */
@media (max-width: 991px) {
    .navbar.novice-nav .navbar-nav { flex-direction: column; }
    .navbar.novice-nav .nav-item { margin-bottom: 2px; }
    .navbar.novice-nav .nav-link { padding: .5rem .75rem; }
    .navbar.novice-nav .nav-link.active::after { display: none; }
    .navbar.novice-nav .collapse { border-top: 1px solid var(--border); margin-top: .5rem; padding-top: .5rem; }
    .jumbotron { padding: 1.5rem !important; }

    /* 手機／平板：側欄改為一般區塊，取消 sticky
       （單欄堆疊時 sticky 會把側欄釘在畫面上，遮擋下方內容） */
    .col-lg-4 > .card[style*="sticky"],
    .col-lg-5 > .card[style*="sticky"],
    [style*="position:sticky"],
    [style*="position: sticky"] {
        position: static !important;
        top: auto !important;
    }
}
@media (max-width: 767px) {
    /* 顏色選擇器在窄螢幕容易被壓扁，給定最小寬度 */
    input[type="color"].form-control { min-width: 44px; }
    /* 表格在手機上允許橫向捲動，避免擠壓 */
    .table-responsive { -webkit-overflow-scrolling: touch; }
}
@media (max-width: 575px) {
    body { padding-top: 58px; }
    .navbar.novice-nav { min-height: 58px; }
    .jumbotron h1 { font-size: 1.4rem; }
    .jumbotron { padding: 1.25rem !important; }
    .btn { font-size: .875rem; }
    .card-body { padding: 1rem; }
    .qr-preview-box { min-height: 200px; padding: 12px; }
    /* 縮小容器左右內距時，必須同步調整 .row 的負邊距，
       否則 .row 會比容器寬造成 3px 橫向溢出 */
    .container { padding-left: 12px; padding-right: 12px; }
    .container > .row,
    .container .row { margin-left: -12px; margin-right: -12px; }
    .container .row > [class*="col-"] { padding-left: 12px; padding-right: 12px; }
}

/* ===== 無障礙：尊重減少動態偏好 ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* ==========================================================================
   五項工具格線（tools-grid）
   ==========================================================================
   為什麼不用 Bootstrap 的 col-lg-3：
     12 欄制無法整除 5，5 張卡片會有 1 張落到第二列並只佔 1/4 寬，
     右側留下大片空白，視覺上像是「寬度暴走」。

   改用 CSS Grid 明確指定欄數：
     桌機（>=992px）  5 欄 → 五張卡片剛好排成一列
     平板（>=768px）  3 欄
     大手機（>=576px）2 欄
     手機（<576px）   1 欄
   ========================================================================== */
.tools-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
.tools-grid-item {
    /* 取消 Bootstrap column 的 padding，由 grid gap 統一控制間距 */
    min-width: 0;
}
.tools-grid-item > .card {
    height: 100%;
}

@media (min-width: 576px) {
    /* 大手機 / 小平板：兩欄，避免單張卡片過寬 */
    .tools-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
    /* 平板：三欄 */
    .tools-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 992px) {
    /* 桌機：五等分，五項工具剛好一列 */
    .tools-grid { grid-template-columns: repeat(5, 1fr); }
}