/* ==========================================================================
   墨泉笔记 Markwell 官网 · 设计系统
   品格定调：墨 #1A2233 / 泉青 #0D9488 / 暖白 #FAF7F2
   "墨落泉涌，笔记成章" —— 简洁大方，文人墨客气质
   ========================================================================== */

:root {
  /* 品牌色（与软件 styles.css 一致） */
  --ink: #1A2233;          /* 墨：标题/主文字 */
  --ink-dim: #5A667E;      /* 墨浅：次要文字 */
  --ink-faint: #8A94A8;    /* 更浅 */
  --spring: #0D9488;       /* 泉青：强调/链接/主按钮 */
  --spring-dark: #0B7C72;  /* 泉青深：hover */
  --spring-soft: #E1F5EE;  /* 泉青浅：标签底 */
  --paper: #FAF7F2;        /* 暖白：页面底 */
  --card: #FFFFFF;         /* 卡片 */
  --border: #E4E7EE;       /* 边框 */
  --border-warm: #EDE7DC;  /* 暖边框 */
  --danger: #A32D2D;
  --link: #378ADD;

  /* 字体：标题宋体（文人气质），正文系统无衬线 */
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(26,34,51,.06), 0 8px 28px rgba(26,34,51,.07);
  --shadow-lg: 0 6px 18px rgba(26,34,51,.08), 0 24px 60px rgba(26,34,51,.10);
  --maxw: 1120px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--spring); text-decoration: none; }
a:hover { color: var(--spring-dark); }
h1, h2, h3, h4 { font-family: var(--font-serif); color: var(--ink); line-height: 1.25; margin: 0; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
::selection { background: var(--spring-soft); }

/* ---------- 布局 ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section-tight { padding: 64px 0; }
.section-alt { background: var(--card); border-top: 1px solid var(--border-warm); border-bottom: 1px solid var(--border-warm); }

/* 标题区 */
.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--spring); font-weight: 600; margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--spring); border-radius: 2px; }
.section-head:not(.left) .eyebrow::after { content: ""; width: 22px; height: 2px; background: var(--spring); border-radius: 2px; }
.section-title { font-size: 34px; font-weight: 600; margin-bottom: 12px; }
.section-lead { color: var(--ink-dim); font-size: 17px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250,247,242,.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-warm);
}
.nav-inner { display: flex; align-items: center; gap: 32px; height: 66px; }
.nav-brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.nav-brand img { width: 34px; height: 34px; }
.nav-brand .nm { font-family: var(--font-serif); font-size: 20px; font-weight: 600; color: var(--ink); letter-spacing: .02em; }
.nav-brand .ne { font-size: 10px; letter-spacing: .32em; color: var(--spring); font-weight: 700; margin-top: 1px; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px; border-radius: 9px; color: var(--ink-dim);
  font-size: 15px; font-weight: 500; transition: all .18s;
}
.nav-links a:hover { color: var(--ink); background: var(--spring-soft); }
.nav-links a.active { color: var(--spring); background: var(--spring-soft); font-weight: 600; }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 11px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; font-family: var(--font-sans);
  cursor: pointer; transition: all .18s; white-space: nowrap;
}
.btn-primary { background: var(--spring); color: #fff; box-shadow: 0 4px 14px rgba(13,148,136,.24); }
.btn-primary:hover { background: var(--spring-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(13,148,136,.30); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--spring); color: var(--spring); background: var(--spring-soft); }
.btn-lg { padding: 15px 30px; font-size: 16px; border-radius: 13px; }
.btn-sm { padding: 8px 15px; font-size: 14px; border-radius: 9px; }
.btn .ic { width: 18px; height: 18px; }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px; border-radius: 999px;
  background: var(--spring-soft); color: var(--spring-dark);
  font-size: 13px; font-weight: 600;
}
.badge-plain { background: #F0EBE2; color: var(--ink-dim); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 96px 0 0; }
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(680px 380px at 82% -8%, rgba(13,148,136,.10), transparent 62%),
    radial-gradient(560px 420px at 6% 24%, rgba(26,34,51,.05), transparent 60%);
}
.hero-inner { position: relative; text-align: center; max-width: 760px; margin: 0 auto; }
.hero-logo { width: 88px; height: 88px; margin: 0 auto 22px; }
.hero-title { font-size: 52px; font-weight: 700; letter-spacing: .01em; }
.hero-slogan { font-family: var(--font-serif); font-size: 21px; color: var(--spring); margin: 16px 0 6px; letter-spacing: .04em; }
.hero-desc { color: var(--ink-dim); font-size: 18px; max-width: 560px; margin: 10px auto 0; }
.hero-actions { display: flex; gap: 14px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }
.hero-meta { margin-top: 22px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; color: var(--ink-faint); font-size: 13px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero-meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--spring); }
.hero-shot {
  position: relative; margin: 60px auto 0; max-width: 920px;
  border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.hero-shot img { width: 100%; }
.hero-shot::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 78%, rgba(26,34,51,.05));
}

/* ---------- 卡片栅格 ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--border-warm);
  border-radius: var(--radius); padding: 26px;
  transition: all .2s; position: relative;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-3px); border-color: rgba(13,148,136,.30); }
.card .icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--spring-soft); display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.card .icon svg { width: 22px; height: 22px; stroke: var(--spring); }
.card h3 { font-size: 19px; margin-bottom: 8px; font-weight: 600; }
.card p { color: var(--ink-dim); font-size: 14.5px; }
.card .key {
  position: absolute; top: 22px; right: 22px;
  font-size: 12px; color: var(--ink-faint); background: #F0EBE2;
  padding: 3px 9px; border-radius: 6px; font-family: ui-monospace, "SF Mono", Consolas, monospace;
}

/* ---------- 特性分区（features/guide） ---------- */
.feat-group { margin-bottom: 60px; }
.feat-group:last-child { margin-bottom: 0; }
.feat-group h2 { font-size: 24px; margin-bottom: 6px; display: flex; align-items: center; gap: 10px; }
.feat-group .g-desc { color: var(--ink-dim); margin-bottom: 22px; font-size: 15px; }

/* ---------- 步骤（guide） ---------- */
.steps { counter-reset: step; }
.step { display: flex; gap: 18px; padding: 22px 0; border-bottom: 1px dashed var(--border-warm); }
.step:last-child { border-bottom: 0; }
.step-num {
  flex: 0 0 40px; height: 40px; border-radius: 50%;
  background: var(--ink); color: var(--paper); display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-size: 18px; font-weight: 600; counter-increment: step;
}
.step-body h3 { font-size: 18px; margin-bottom: 6px; }
.step-body p { color: var(--ink-dim); font-size: 15px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 520px; }
thead th { background: #F0EBE2; color: var(--ink); text-align: left; padding: 12px 16px; font-weight: 600; font-size: 13.5px; letter-spacing: .02em; }
tbody td { padding: 12px 16px; border-top: 1px solid var(--border-warm); color: var(--ink-dim); }
tbody td:first-child { color: var(--ink); font-weight: 500; }
tbody tr:hover td { background: #FCFAF6; }
kbd {
  display: inline-block; padding: 2px 8px; border-radius: 6px; font-size: 12.5px;
  background: var(--paper); border: 1px solid var(--border); border-bottom-width: 2px;
  font-family: ui-monospace, "SF Mono", Consolas, monospace; color: var(--ink);
}

/* ---------- 下载卡片 ---------- */
.dl-card { display: flex; flex-direction: column; }
.dl-card .os { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.dl-card .os .os-ic { width: 40px; height: 40px; border-radius: 10px; background: #F0EBE2; display: flex; align-items: center; justify-content: center; }
.dl-card .os h3 { font-size: 18px; }
.dl-card .os small { color: var(--ink-faint); font-size: 12px; display: block; }
.dl-card .ver { font-size: 13px; color: var(--ink-dim); margin-bottom: 4px; }
.dl-card .meta { font-size: 12.5px; color: var(--ink-faint); margin-bottom: 18px; }
.dl-card .meta b { color: var(--ink-dim); font-weight: 600; }
.dl-actions { margin-top: auto; display: flex; gap: 10px; flex-wrap: wrap; }
.dl-note { display: flex; gap: 12px; padding: 18px; border-radius: var(--radius); background: var(--spring-soft); border: 1px solid rgba(13,148,136,.18); margin-top: 18px; }
.dl-note svg { flex: 0 0 22px; width: 22px; height: 22px; stroke: var(--spring-dark); margin-top: 2px; }
.dl-note p { color: var(--spring-dark); font-size: 14px; }

/* ---------- 版本时间线 ---------- */
.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--border); }
.tl-item { position: relative; padding-bottom: 26px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -26px; top: 7px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--spring); box-shadow: 0 0 0 4px var(--spring-soft);
}
.tl-item.old::before { background: var(--ink-faint); box-shadow: 0 0 0 4px #F0EBE2; }
.tl-item .v { font-family: var(--font-serif); font-size: 17px; font-weight: 600; }
.tl-item .d { font-size: 12.5px; color: var(--ink-faint); margin: 2px 0 6px; }
.tl-item ul { color: var(--ink-dim); font-size: 14px; }
.tl-item ul li { padding: 2px 0 2px 14px; position: relative; }
.tl-item ul li::before { content: "·"; position: absolute; left: 0; color: var(--spring); font-weight: 700; }

/* ---------- 页脚 ---------- */
.footer { background: var(--ink); color: #C9CFDC; padding: 60px 0 34px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.footer-brand img { width: 40px; height: 40px; }
.footer-brand .nm { font-family: var(--font-serif); color: #fff; font-size: 20px; font-weight: 600; }
.footer-brand .ne { font-size: 10px; letter-spacing: .3em; color: var(--spring); font-weight: 700; }
.footer p { font-size: 14px; color: #A2ABB9; max-width: 320px; }
.footer h4 { color: #fff; font-size: 15px; font-family: var(--font-sans); font-weight: 600; margin-bottom: 14px; }
.footer ul li { margin-bottom: 9px; }
.footer ul a { color: #A2ABB9; font-size: 14px; }
.footer ul a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.10); margin-top: 44px; padding-top: 22px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: #7A8496;
}
.footer-bottom a { color: #A2ABB9; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 联系表单 ---------- */
.form { display: grid; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field > label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
.field label .req { color: var(--danger); margin-left: 2px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border-radius: 11px;
  border: 1px solid var(--border); background: #fff; color: var(--ink);
  font-size: 15px; font-family: var(--font-sans); transition: all .18s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--spring); box-shadow: 0 0 0 4px rgba(13,148,136,.12);
}
.field textarea { min-height: 150px; resize: vertical; }
.field .hint { font-size: 12.5px; color: var(--ink-faint); margin-top: 6px; }
.radio-group { display: flex; gap: 10px; flex-wrap: wrap; }
.radio-group label {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 15px;
  border: 1px solid var(--border); border-radius: 999px; cursor: pointer;
  font-size: 14px; color: var(--ink-dim); transition: all .15s;
  white-space: nowrap; flex: 0 0 auto;
}
.radio-group input { accent-color: var(--spring); }
.radio-group label:has(input:checked) { border-color: var(--spring); background: var(--spring-soft); color: var(--spring-dark); font-weight: 500; }
.form-actions { display: flex; gap: 12px; align-items: center; }
.form-status { font-size: 14px; }
.form-status.ok { color: var(--spring-dark); }
.form-status.err { color: var(--danger); }

/* ---------- 联系信息 ---------- */
.contact-card { text-align: center; }
.contact-card img { width: 120px; height: 120px; margin: 0 auto 16px; border-radius: 14px; border: 1px solid var(--border); }
.contact-card h3 { font-size: 17px; margin-bottom: 6px; }
.contact-card p { color: var(--ink-dim); font-size: 14px; }

/* ---------- 关于 ---------- */
.about-hero { text-align: center; max-width: 720px; margin: 0 auto; }
.about-hero img { width: 96px; height: 96px; margin: 0 auto 22px; }
.about-quote {
  font-family: var(--font-serif); font-size: 26px; color: var(--ink);
  line-height: 1.5; margin: 0 auto; max-width: 640px;
}
.about-quote em { color: var(--spring); font-style: normal; }
.pillars { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid-3, .pillars { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-title { font-size: 38px; }
  .nav-links {
    position: absolute; top: 66px; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--border-warm);
    flex-direction: column; align-items: stretch; padding: 12px 24px 20px;
    display: none; box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-cta { margin: 4px 0 0; }
  .nav-toggle {
    display: flex; align-items: center; justify-content: center;
    width: 42px; height: 42px; border: 1px solid var(--border);
    background: #fff; border-radius: 10px; cursor: pointer;
  }
  .nav-toggle svg { width: 20px; height: 20px; stroke: var(--ink); }
  .section { padding: 60px 0; }
}
@media (max-width: 640px) {
  .grid-3, .grid-2, .pillars, .form-row { grid-template-columns: 1fr; }
  .hero-title { font-size: 30px; }
  .hero-slogan { font-size: 17px; }
  .section-title { font-size: 26px; }
}