/* ==========================================================================
   Mitjai — 靜態網站樣式
   純 CSS，無外部字型、無 CDN、無追蹤。手機優先，深色模式友善。
   泰文排版：行高加大（聲調符號疊在字上方，行高不足會被切）。
   ========================================================================== */

/* ---------- 1. 設計權杖 ---------- */

:root {
  --bg:            #fbfaf8;
  --bg-elev:       #ffffff;
  --bg-sunken:     #f3f1ec;
  --text:          #1b1a17;
  --text-soft:     #56514a;
  --text-faint:    #837c72;
  --line:          #e2ded6;
  --line-strong:   #cfc9be;
  --accent:        #0e6f5f;
  --accent-soft:   #e3f2ee;
  --accent-text:   #0b5a4d;
  --warn-bg:       #fdf3e3;
  --warn-line:     #e8cf9f;
  --warn-text:     #6d4f16;
  --danger:        #9a2c2c;
  --radius:        14px;
  --radius-sm:     9px;
  --shadow:        0 1px 2px rgba(27, 26, 23, .05), 0 6px 20px rgba(27, 26, 23, .05);
  --maxw:          46rem;

  --font-zh: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
             "Noto Sans TC", "Microsoft JhengHei", "Hiragino Sans", sans-serif;
  --font-th: -apple-system, BlinkMacSystemFont, "Thonburi", "Noto Sans Thai",
             "Leelawadee UI", "Segoe UI", "Sarabun", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #141613;
    --bg-elev:     #1c1f1c;
    --bg-sunken:   #101210;
    --text:        #eceae5;
    --text-soft:   #b6b2aa;
    --text-faint:  #8d8880;
    --line:        #2c302c;
    --line-strong: #3c413c;
    --accent:      #4fc9ae;
    --accent-soft: #16302a;
    --accent-text: #79dcc3;
    --warn-bg:     #2b2415;
    --warn-line:   #514328;
    --warn-text:   #e2c489;
    --danger:      #e58d8d;
    --shadow:      0 1px 2px rgba(0, 0, 0, .3), 0 6px 22px rgba(0, 0, 0, .28);
  }
}

/* ---------- 2. 基礎 ---------- */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-zh);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

/* 泰文：行高必須更高，否則聲調符號（กิ๊ ก้ ญ ฐ）上下會被切掉。
   泰文詞間無空格，交給瀏覽器的 ICU 斷詞，並允許必要時任意斷行。 */
[data-lang="th"],
:lang(th) {
  font-family: var(--font-th);
  line-height: 2.05;
  letter-spacing: 0;
  word-break: normal;
  overflow-wrap: anywhere;
  line-break: normal;
}

[data-lang="th"] h1, [data-lang="th"] h2,
[data-lang="th"] h3, [data-lang="th"] h4 { line-height: 1.6; }

[data-lang="th"] li { margin-bottom: .5em; }
[data-lang="th"] td, [data-lang="th"] th { line-height: 1.95; }

/* 語言切換：無 JS 時 html 上的 data-active-lang="zh" 仍然有效，頁面照常顯示。 */
html[data-active-lang="zh"] [data-lang="th"] { display: none; }
html[data-active-lang="th"] [data-lang="zh"] { display: none; }

h1, h2, h3, h4 {
  line-height: 1.35;
  letter-spacing: -.005em;
  margin: 2.2em 0 .6em;
  font-weight: 650;
}
h1 { font-size: 1.95rem; margin-top: 0; letter-spacing: -.02em; }
h2 { font-size: 1.32rem; }
h3 { font-size: 1.06rem; }
h4 { font-size: .98rem; color: var(--text-soft); }

p, ul, ol, table, blockquote, pre { margin: 0 0 1.1em; }
ul, ol { padding-left: 1.35em; }
li { margin-bottom: .35em; }
li > ul, li > ol { margin-top: .35em; }

a {
  color: var(--accent-text);
  text-underline-offset: .18em;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-thickness: 2px; }
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

strong { font-weight: 650; }
code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: .1em .35em;
}
hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5em 0;
}

/* ---------- 3. 版面 ---------- */

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.15rem;
}

main { padding-bottom: 4rem; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: .6em 1em;
  z-index: 99;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip:focus { left: 0; }

/* ---------- 4. 頁首與導覽 ---------- */

.site-head {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}

.head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  min-height: 3.4rem;
}

.brand {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  flex-shrink: 0;
}
.brand .mark {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  display: inline-grid;
  place-items: center;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: -.03em;
  flex-shrink: 0;
}
@media (prefers-color-scheme: dark) {
  .brand .mark { color: #0d1a17; }
}

/* 語言切換按鈕（純 CSS 分段控制項） */
.langsw {
  display: inline-flex;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px;
  flex-shrink: 0;
}
.langsw button {
  font: inherit;
  font-size: .8rem;
  line-height: 1.4;
  padding: .28em .8em;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.langsw button[aria-pressed="true"] {
  background: var(--bg-elev);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .1);
  font-weight: 600;
}
.langsw button:nth-child(2) { font-family: var(--font-th); }

.site-nav {
  border-top: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.site-nav::-webkit-scrollbar { display: none; }
.site-nav ul {
  display: flex;
  gap: .2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}
.site-nav a {
  display: block;
  padding: .6em .7em;
  font-size: .85rem;
  color: var(--text-soft);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--text); }
.site-nav a[aria-current="page"] {
  color: var(--accent-text);
  border-bottom-color: var(--accent);
  font-weight: 600;
}
.site-nav li:first-child a { padding-left: 0; }

/* ---------- 5. 首頁 hero ---------- */

.hero { padding: 3rem 0 1rem; }
.hero h1 {
  font-size: clamp(1.9rem, 7vw, 2.6rem);
  letter-spacing: -.025em;
  margin-bottom: .5em;
}
.hero .lede {
  font-size: 1.08rem;
  color: var(--text-soft);
  max-width: 34rem;
}
[data-lang="th"] .hero .lede { font-size: 1.02rem; }

.pairline {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent-text);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: .3em .9em;
  margin-bottom: 1.4rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 1.8rem 0 .6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font: inherit;
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.3;
  padding: .78em 1.4em;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow);
}
@media (prefers-color-scheme: dark) {
  .btn-primary { color: #0b1714; }
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
}
.btn-ghost:hover { background: var(--bg-sunken); }

.note-small {
  font-size: .82rem;
  color: var(--text-faint);
  margin-top: .2em;
}

/* ---------- 6. 功能卡 ---------- */

.cards {
  display: grid;
  gap: .9rem;
  grid-template-columns: 1fr;
  margin: 1.2rem 0 2rem;
  padding: 0;
  list-style: none;
}
@media (min-width: 34rem) {
  .cards { grid-template-columns: 1fr 1fr; }
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.15rem 1.25rem;
  margin: 0;
}
.card h3 {
  margin: 0 0 .35em;
  font-size: 1rem;
  display: flex;
  align-items: baseline;
  gap: .5rem;
}
.card p {
  margin: 0;
  font-size: .92rem;
  color: var(--text-soft);
}
.card .num {
  font-size: .72rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

/* ---------- 7. 區塊元件 ---------- */

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
  margin: 0 0 1.3rem;
}
.panel > :first-child { margin-top: 0; }
.panel > :last-child { margin-bottom: 0; }

.callout {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: var(--radius-sm);
  padding: .9rem 1rem;
  margin: 0 0 1.3rem;
  font-size: .92rem;
  color: var(--warn-text);
}
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.callout strong { color: inherit; }

.summary-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.summary-list li {
  padding-left: 1.6em;
  position: relative;
  margin-bottom: .55em;
}
.summary-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: 700;
}
.summary-list li.no::before {
  content: "✕";
  color: var(--danger);
}

.doc-meta {
  font-size: .84rem;
  color: var(--text-faint);
  margin: -.3rem 0 1.8rem;
}

/* ---------- 8. 表格（手機可橫向捲動） ---------- */

.tablewrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin: 0 0 1.4rem;
}
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 30rem;
  font-size: .89rem;
  margin: 0;
}
th, td {
  text-align: left;
  padding: .62em .85em;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
thead th {
  background: var(--bg-sunken);
  font-weight: 650;
  font-size: .82rem;
  color: var(--text-soft);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }

/* ---------- 9. FAQ ---------- */

.faq {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  margin-bottom: .6rem;
  overflow: hidden;
}
.faq summary {
  cursor: pointer;
  padding: .9em 1em;
  font-weight: 600;
  font-size: .96rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: .8rem;
  align-items: flex-start;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  color: var(--accent);
  font-weight: 400;
  font-size: 1.3em;
  line-height: 1;
  flex-shrink: 0;
}
.faq[open] summary::after { content: "\2212"; }
.faq[open] summary { border-bottom: 1px solid var(--line); }
.faq .faq-body {
  padding: .95em 1em 1em;
  font-size: .93rem;
  color: var(--text-soft);
}
.faq .faq-body > :first-child { margin-top: 0; }
.faq .faq-body > :last-child { margin-bottom: 0; }

/* ---------- 10. 步驟 ---------- */

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 1.4rem;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.4rem;
  margin-bottom: 1rem;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: .12em;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-size: .8rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  font-variant-numeric: tabular-nums;
}

/* ---------- 11. 聯絡區塊 ---------- */

.contact-box {
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.2rem;
  margin: 2rem 0 1rem;
  text-align: center;
}
.contact-box > :first-child { margin-top: 0; }
.contact-box .mail {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  word-break: break-all;
}

/* ---------- 12. 頁尾 ---------- */

.site-foot {
  border-top: 1px solid var(--line);
  background: var(--bg-sunken);
  padding: 2rem 0 2.6rem;
  font-size: .85rem;
  color: var(--text-faint);
}
.site-foot ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1.1em;
  display: flex;
  flex-wrap: wrap;
  gap: .4em 1.1em;
}
.site-foot a { color: var(--text-soft); }
.site-foot p { margin: 0 0 .4em; }

/* ---------- 13. 算式示意（時數會計系統頁） ---------- */

.formula {
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 1.3rem 1rem;
  margin: 0 0 .6rem;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  line-height: 2.2;
  /* 窄螢幕讓它換行，不要變成要橫向捲的一條線 */
  white-space: normal;
}
.formula .op { color: var(--text-faint); font-weight: 400; margin: 0 .35em; }
.formula .out { color: var(--accent-text); }
.formula-cap {
  text-align: center;
  font-size: .8rem;
  color: var(--text-faint);
  margin: 0 0 1.6rem;
}

/* ---------- 14. 草稿標記（上線前移除，見 README 檢查表） ---------- */

.draft-flag {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  background: var(--warn-bg);
  color: var(--warn-text);
  border: 1px solid var(--warn-line);
  border-radius: 5px;
  padding: .1em .45em;
  vertical-align: middle;
  margin-left: .4em;
  font-family: var(--font-zh);
}

/* 上架前的「即將上架」狀態：看起來仍是主要按鈕但不可點。
   上架那天把 index.html 的 span.btn-disabled 換回 a[href]，
   本規則可留著不刪（沒有元素會用到它）。 */
.btn-disabled {
  opacity: .62;
  cursor: default;
  pointer-events: none;
}