/* ==========================================================================
   Blaise Chen — 全站設計系統
   品牌色：藍 #2363aa / 橘 #e55c19 ｜ 支援亮/暗模式
   ========================================================================== */

:root {
  --brand:        #2563eb;
  --brand-600:    #1d4ed8;
  --brand-700:    #1e40af;
  --brand-light:  #3b82f6;
  --accent:       #e55c19;
  --accent-600:   #cf4d0f;

  --bg:           #f6f9fd;
  --bg-soft:      #eef4fb;
  --surface:      #ffffff;
  --surface-2:    #f3f6fb;
  --border:       #dfe7f2;
  --text:         #1f2a37;
  --text-soft:    #56637a;
  --text-mute:    #8996ab;

  --radius:       16px;
  --radius-sm:    10px;
  --shadow:       0 2px 18px rgba(30, 60, 120, .08);
  --shadow-lg:    0 10px 40px rgba(30, 60, 120, .14);
  --ring:         0 0 0 3px rgba(37, 99, 235, .30);

  --grad:         linear-gradient(90deg, var(--brand) 0%, var(--brand-light) 100%);
  --maxw:         1080px;
  --header-h:     64px;

  --font: "Noto Sans TC", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* 深色變數（供系統偏好與手動切換共用）*/
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        #0f1620;
    --bg-soft:   #131c28;
    --surface:   #18222f;
    --surface-2: #1e2a39;
    --border:    #273548;
    --text:      #e7eefb;
    --text-soft: #a9b8ce;
    --text-mute: #74839a;
    --shadow:    0 2px 18px rgba(0, 0, 0, .35);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, .5);
  }
}
:root[data-theme="dark"] {
  --bg:        #0f1620;
  --bg-soft:   #131c28;
  --surface:   #18222f;
  --surface-2: #1e2a39;
  --border:    #273548;
  --text:      #e7eefb;
  --text-soft: #a9b8ce;
  --text-mute: #74839a;
  --shadow:    0 2px 18px rgba(0, 0, 0, .35);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, .5);
}

/* ---- 基礎 ---------------------------------------------------------------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16.5px;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
h1, h2, h3, h4 { line-height: 1.3; color: var(--text); }
::selection { background: var(--accent); color: #fff; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
.section { padding: 4rem 0; }
.section-sm { padding: 2.5rem 0; }
.eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent); margin-bottom: .5rem;
}
.section-title {
  font-size: 1.7rem; font-weight: 800; margin: 0 0 .4rem;
  letter-spacing: 1px; position: relative; padding-left: .7rem;
}
.section-title::before {
  content: ""; position: absolute; left: 0; top: .15em; bottom: .15em;
  width: 4px; border-radius: 3px; background: var(--grad);
}
.section-desc { color: var(--text-soft); margin: 0 0 2rem; }
.text-center { text-align: center; }

/* ---- 按鈕 --------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .7rem 1.5rem; border-radius: 100px; font-weight: 700;
  font-size: 1rem; cursor: pointer; border: 1px solid transparent;
  transition: transform .16s, box-shadow .16s, background .16s;
}
.btn:focus-visible { outline: none; box-shadow: var(--ring); }
.btn-primary { background: var(--brand); color: #fff !important; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--brand-600); transform: translateY(-2px); box-shadow: var(--shadow-lg); color: #fff; }
.btn-ghost { background: var(--surface); color: var(--brand) !important; border-color: var(--border); }
.btn-ghost:hover { border-color: var(--brand); transform: translateY(-2px); }

/* ---- 頁首導覽 ----------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--maxw); margin: 0 auto; height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; padding: 0 1.25rem;
}
.nav-brand { font-size: 1.3rem; font-weight: 800; letter-spacing: 1px; color: var(--brand); }
.nav-brand:hover { color: var(--accent); }
.nav-links { display: flex; gap: .3rem; list-style: none; margin: 0; padding: 0; align-items: center; }
.nav-links a {
  padding: .45rem .85rem; border-radius: 8px; font-weight: 600; color: var(--text-soft);
  transition: background .2s, color .2s;
}
.nav-links a:hover, .nav-links a.active { background: var(--bg-soft); color: var(--brand); }
.nav-toggle, .nav-toggle-label { display: none; }

@media (max-width: 760px) {
  .nav-toggle-label {
    display: flex; flex-direction: column; gap: 5px; cursor: pointer;
    width: 40px; height: 40px; justify-content: center; align-items: center;
  }
  .nav-toggle-label span { width: 24px; height: 3px; background: var(--brand); border-radius: 2px; transition: .3s; }
  .nav-links {
    position: absolute; top: var(--header-h); left: 0; right: 0; flex-direction: column;
    background: var(--surface); border-bottom: 1px solid var(--border);
    max-height: 0; overflow: hidden; padding: 0; gap: 0;
    box-shadow: var(--shadow); transition: max-height .3s;
  }
  .nav-links li { width: 100%; text-align: center; }
  .nav-links a { display: block; padding: .9rem; border-radius: 0; }
  .nav-toggle:checked ~ .nav-links { max-height: 340px; padding: .3rem 0; }
  .nav-toggle:checked + .nav-toggle-label span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
  .nav-toggle:checked + .nav-toggle-label span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked + .nav-toggle-label span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }
}

/* ---- Hero --------------------------------------------------------------- */
.hero {
  text-align: center; padding: 4.5rem 1.25rem 3.5rem;
  background: radial-gradient(1200px 400px at 50% -10%, var(--bg-soft), transparent);
}
.hero .avatar {
  width: 128px; height: 128px; border-radius: 50%; object-fit: cover; margin: 0 auto 1.5rem;
  box-shadow: var(--shadow-lg); background: var(--surface-2);
  animation: float 4s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.hero h1 { font-size: 2.6rem; font-weight: 800; margin: 0 0 .5rem; letter-spacing: 1px; }
.hero .lead { font-size: 1.2rem; color: var(--text-soft); margin: 0 0 1.8rem; }
.hero .cta { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }
@media (max-width: 600px) { .hero h1 { font-size: 2rem; } }

/* ---- 卡片網格 ----------------------------------------------------------- */
.grid { display: grid; gap: 1.4rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.6rem; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s, border-color .2s;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--brand) 40%, var(--border)); }
.card .icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  font-size: 1.5rem; color: #fff; background: var(--grad); margin-bottom: 1rem;
}
.card h3 { margin: 0 0 .5rem; font-size: 1.25rem; }
.card p { margin: 0 0 1rem; color: var(--text-soft); flex: 1; }
.card .card-link { font-weight: 700; color: var(--brand); }
.card .card-link::after { content: " →"; }

/* ---- 部落格列表 --------------------------------------------------------- */
.post-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.1rem; }
.post-item {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.3rem 1.5rem; box-shadow: var(--shadow); transition: transform .18s, box-shadow .18s;
}
.post-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.post-item.has-thumb { display: flex; gap: 1.2rem; align-items: stretch; }
.post-thumb { flex: 0 0 180px; border-radius: var(--radius-sm); overflow: hidden; background: var(--surface-2); }
.post-thumb img { width: 100%; height: 100%; min-height: 110px; object-fit: cover; }
.post-item .post-body { min-width: 0; flex: 1; }
@media (max-width: 560px) {
  .post-item.has-thumb { flex-direction: column; }
  .post-thumb { flex-basis: auto; max-height: 180px; }
}
.post-item h3 { margin: 0 0 .35rem; font-size: 1.3rem; }
.post-item h3 a { color: var(--text); }
.post-item h3 a:hover { color: var(--accent); }
.post-meta { font-size: .85rem; color: var(--text-mute); display: flex; gap: .8rem; flex-wrap: wrap; margin-bottom: .6rem; }
.post-excerpt { color: var(--text-soft); margin: 0; }
.tag {
  display: inline-block; font-size: .75rem; font-weight: 700; padding: .15rem .6rem;
  border-radius: 100px; background: var(--bg-soft); color: var(--brand);
}

/* ---- 單篇文章 ----------------------------------------------------------- */
.post { max-width: 760px; margin: 0 auto; padding: 3rem 1.25rem; }
.post-header { margin-bottom: 2rem; text-align: center; }
.post-header h1 { font-size: 2.2rem; margin: .5rem 0 .8rem; }
.post-content { font-size: 1.08rem; }
.post-content h2 { margin-top: 2.2rem; font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: .4rem; }
.post-content h3 { margin-top: 1.6rem; font-size: 1.25rem; }
.post-content p, .post-content li { color: var(--text); }
.post-content pre {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1rem 1.2rem; overflow-x: auto;
}
.post-content code { background: var(--surface-2); padding: .12rem .4rem; border-radius: 5px; font-size: .92em; }
.post-content pre code { background: none; padding: 0; }
.post-content blockquote {
  margin: 1.5rem 0; padding: .6rem 1.2rem; border-left: 4px solid var(--accent);
  background: var(--bg-soft); color: var(--text-soft); border-radius: 0 8px 8px 0;
}
.post-content img { border-radius: var(--radius-sm); margin: 1.5rem auto; box-shadow: var(--shadow); }
.post-content table { width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: .95em; display: block; overflow-x: auto; }
.post-content th, .post-content td { border: 1px solid var(--border); padding: .55rem .8rem; text-align: left; vertical-align: top; }
.post-content thead th { background: var(--bg-soft); color: var(--brand); font-weight: 700; }
.post-content tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--bg-soft) 45%, transparent); }
.post-nav { max-width: 760px; margin: 2rem auto 0; padding: 0 1.25rem; display: flex; justify-content: space-between; gap: 1rem; }

/* ---- 社群圖示列 --------------------------------------------------------- */
.social-row { display: flex; gap: .7rem; justify-content: center; flex-wrap: wrap; margin: 1.5rem 0; }
.social-row a {
  width: 46px; height: 46px; display: grid; place-items: center; font-size: 1.2rem;
  border-radius: 12px; background: var(--surface); color: var(--brand);
  border: 1px solid var(--border); box-shadow: var(--shadow); transition: transform .18s, background .18s, color .18s;
}
.social-row a:hover { transform: translateY(-4px) rotate(-4deg); background: var(--accent); color: #fff; }

/* ---- 廣告位 ------------------------------------------------------------- */
.ad-slot { margin: 2.5rem auto; text-align: center; min-height: 90px; }
.ad-slot small { display: block; color: var(--text-mute); font-size: .7rem; letter-spacing: 1px; margin-bottom: .3rem; }

/* ---- 頁尾 --------------------------------------------------------------- */
.site-footer {
  background: var(--surface); border-top: 1px solid var(--border); margin-top: 4rem;
  padding: 2.5rem 1.25rem; text-align: center; color: var(--text-soft);
}
.site-footer .foot-links { display: flex; gap: 1.2rem; justify-content: center; flex-wrap: wrap; margin-bottom: 1rem; }
.site-footer .foot-links a { color: var(--text-soft); font-weight: 600; }
.site-footer .foot-links a:hover { color: var(--accent); }
.site-footer .copy { font-size: .88rem; color: var(--text-mute); }