/* ============================================================
   Ray 的分享 · 手写笔记风（王虹手写 PPT 风格）
   米白纸面 / 深藏青正文 / 钴蓝主线 / 玫红结论 / 荧光黄短词强调
   简约直接，零装饰噪声
   ============================================================ */

:root {
  --paper: #fbf9f2;            /* 米白纸面 */
  --card: #fffef9;             /* 卡片白纸 */
  --ink: #1e2d4f;              /* 深藏青：正文 */
  --ink-2: #4c5870;            /* 次级文字 */
  --ink-3: #8a93a6;            /* 弱化文字 */
  --blue: #2563eb;             /* 钴蓝：主线/下划线 */
  --magenta: #e11d48;          /* 玫红：结论/重点 */
  --yellow: rgba(250, 204, 21, 0.5);  /* 荧光黄：短词高亮 */
  --green: #0f9d6e;            /* 绿：确认/正向 */
  --line: #e7e2d0;             /* 纸面细线 */
  --hand: "Ma Shan Zheng", "Kaiti SC", "STKaiti", "KaiTi", "楷体", cursive;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, monospace;
  /* 手绘感不规则圆角 */
  --r-hand: 255px 15px 225px 15px / 15px 225px 15px 255px;
  --r-hand-2: 15px 225px 15px 255px / 255px 15px 225px 15px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

.hand { font-family: var(--hand); }

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 荧光笔高亮：只压短词 */
.hl {
  background: linear-gradient(transparent 62%, var(--yellow) 62%);
  padding: 0 2px;
}
.hl-magenta {
  background: linear-gradient(transparent 62%, rgba(225, 29, 72, 0.14) 62%);
  padding: 0 2px;
}

/* ---------- 顶部导航：极简一行 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 249, 242, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px dashed var(--line);
}
.nav-inner {
  max-width: 860px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand {
  font-family: var(--hand); font-size: 22px; font-weight: 400;
  color: var(--ink); letter-spacing: 1px;
}
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 24px; font-size: 15px; }
.nav-links a { color: var(--ink-2); }
.nav-links a:hover { color: var(--blue); text-decoration: none; }

/* ---------- Hero：一张纸，一个大标题 ---------- */
.hero { padding: 88px 24px 72px; }
.hero-inner { max-width: 860px; margin: 0 auto; }
.hero h1 {
  font-family: var(--hand);
  font-size: 54px; font-weight: 400;
  line-height: 1.3; letter-spacing: 2px;
  color: var(--ink);
}
.hero .underline {
  display: block; margin-top: 14px;
  max-width: 460px; height: 10px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 460 12' preserveAspectRatio='none'%3E%3Cpath d='M2 8 C 60 2, 120 10, 200 6 S 360 3, 458 7' fill='none' stroke='%232563eb' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat center / 100% 100%;
}
.hero .sub {
  margin-top: 22px; font-size: 17px; color: var(--ink-2); max-width: 560px;
}
.cta-row { margin-top: 32px; display: flex; gap: 16px; flex-wrap: wrap; }
.btn-hand {
  display: inline-block;
  font-family: var(--hand); font-size: 19px; letter-spacing: 1px;
  color: var(--ink);
  padding: 10px 26px;
  border: 2px solid var(--ink);
  border-radius: var(--r-hand);
  background: transparent;
  transition: all 0.12s ease;
}
.btn-hand:hover {
  text-decoration: none;
  transform: rotate(-1deg) translateY(-1px);
  box-shadow: 4px 4px 0 rgba(30, 45, 79, 0.12);
}
.btn-hand.blue { border-color: var(--blue); color: var(--blue); }
.btn-hand.blue:hover { background: rgba(37, 99, 235, 0.06); }
.btn-hand.magenta { border-color: var(--magenta); color: var(--magenta); }
.btn-hand.magenta:hover { background: rgba(225, 29, 72, 0.06); }
.btn-hand.solid { background: var(--magenta); border-color: var(--magenta); color: #fff; }
.btn-hand.solid:hover { background: #c1123f; }

/* ---------- 通用区块 ---------- */
.section { max-width: 860px; margin: 0 auto; padding: 52px 24px 0; }
.section h2 {
  font-family: var(--hand); font-size: 32px; font-weight: 400;
  letter-spacing: 1px; color: var(--ink);
  display: flex; align-items: center; gap: 12px;
}
.section h2 .arrow {
  display: inline-block; color: var(--magenta); font-size: 26px;
}
.section .sub { color: var(--ink-2); margin-top: 8px; font-size: 15px; }

/* ---------- 项目卡片：白纸 + 手绘边框 ---------- */
.project-card {
  background: var(--card);
  border: 2px solid rgba(30, 45, 79, 0.16);
  border-radius: var(--r-hand);
  padding: 30px 32px; margin-top: 26px;
  display: block; position: relative;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.project-card:hover {
  text-decoration: none;
  transform: rotate(-0.3deg) translateY(-2px);
  box-shadow: 6px 8px 0 rgba(30, 45, 79, 0.08);
}
.pc-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.pc-name { font-family: var(--hand); font-size: 27px; font-weight: 400; color: var(--ink); }
.pc-short { color: var(--ink-2); font-size: 14px; margin-top: 2px; }
.pc-one { margin-top: 14px; font-size: 16px; color: var(--ink-2); }
.pc-one b { color: var(--ink); font-weight: 600; }
.pc-meta { margin-top: 16px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.pc-foot { margin-top: 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.pc-arrow { font-family: var(--hand); color: var(--magenta); font-size: 19px; letter-spacing: 1px; }

/* ---------- 手写标签 ---------- */
.tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font-family: var(--hand); font-size: 15px; letter-spacing: 0.5px;
  padding: 2px 12px; border-radius: 999px;
  background: rgba(37, 99, 235, 0.1); color: var(--blue);
}
.tag-yellow { background: var(--yellow); color: #92400e; }
.tag-magenta { background: rgba(225, 29, 72, 0.1); color: var(--magenta); }
.tag-green { background: rgba(15, 157, 110, 0.12); color: var(--green); }
.tag-ink { background: rgba(30, 45, 79, 0.08); color: var(--ink-2); }

/* ---------- 一点想法 ---------- */
.why-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.why-item {
  background: var(--card);
  border: 2px solid rgba(30, 45, 79, 0.14);
  border-radius: var(--r-hand-2);
  padding: 24px 22px;
  transition: transform 0.12s ease;
}
.why-item:hover { transform: rotate(-0.5deg); }
.why-item .num {
  font-family: var(--hand); font-size: 30px; color: var(--magenta); letter-spacing: 1px;
}
.why-item h3 { font-family: var(--hand); font-size: 21px; font-weight: 400; margin-top: 10px; letter-spacing: 0.5px; }
.why-item p { font-size: 14.5px; color: var(--ink-2); margin-top: 8px; }

/* 免责小字（页脚前的手写署名） */
.disclaimer {
  margin-top: 40px; text-align: center;
  font-family: var(--hand); font-size: 15px; letter-spacing: 0.5px;
  color: var(--ink-3);
}

/* ---------- 详情页 ---------- */
.crumb { max-width: 860px; margin: 0 auto; padding: 30px 24px 0; font-size: 14px; color: var(--ink-3); }
.crumb a { color: var(--ink-3); }
.crumb a:hover { color: var(--blue); }
.detail-head { max-width: 860px; margin: 0 auto; padding: 22px 24px 0; }
.detail-head h1 {
  font-family: var(--hand); font-size: 44px; font-weight: 400;
  margin-top: 14px; letter-spacing: 1px; color: var(--ink);
}
.detail-head .one { font-size: 17px; color: var(--ink-2); margin-top: 12px; max-width: 640px; }
.detail-head .one b { color: var(--ink); font-weight: 600; }
.detail-meta { margin-top: 16px; display: flex; gap: 20px; flex-wrap: wrap; font-size: 13.5px; color: var(--ink-3); }
.detail-meta b { color: var(--ink); font-weight: 600; }

/* 下载框：白纸 + 荧光黄一角 + 玫红按钮 */
.dl-box {
  max-width: 860px; margin: 28px 24px 0; padding: 24px 28px;
  background: var(--card);
  border: 2px solid rgba(30, 45, 79, 0.18);
  border-radius: var(--r-hand);
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  position: relative;
}
.dl-box::before {
  content: ""; position: absolute; left: -2px; top: -2px; bottom: 60%;
  width: 6px; background: var(--yellow); border-radius: 3px;
}
.dl-box .dl-name { font-family: var(--hand); font-size: 22px; color: var(--ink); }
.dl-box .dl-sub { font-size: 13px; color: var(--ink-3); margin-top: 4px; }
.dl-files { display: flex; flex-direction: column; gap: 10px; }
.dl-file { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.dl-file-desc { font-size: 13px; color: var(--ink-2); }

/* ---------- 内容区块 ---------- */
.block { max-width: 860px; margin: 0 auto; padding: 44px 24px 0; }
.block h2 {
  font-family: var(--hand); font-size: 30px; font-weight: 400; letter-spacing: 1px;
  display: flex; align-items: center; gap: 10px; color: var(--ink);
}
.block h2 .mark {
  width: 22px; height: 22px; flex-shrink: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M4 18 C 7 8, 12 4, 20 6 M20 6 l-6 -1 M20 6 l-2 5' fill='none' stroke='%23e11d48' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center / contain;
}
.block p { color: var(--ink-2); margin-top: 12px; font-size: 15.5px; }
.block p strong { color: var(--ink); font-weight: 600; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 20px; }
.mini-card {
  background: var(--card);
  border: 2px solid rgba(30, 45, 79, 0.14);
  border-radius: var(--r-hand-2);
  padding: 20px 22px;
}
.mini-card h3 {
  font-family: var(--hand); font-size: 20px; font-weight: 400; letter-spacing: 0.5px;
  display: flex; align-items: center; gap: 8px;
}
.mini-card p { margin-top: 8px; font-size: 14.5px; color: var(--ink-2); }

/* 步骤条：手写数字 + 虚线连接 */
.steps { margin-top: 22px; display: flex; flex-direction: column; }
.step { display: flex; gap: 18px; position: relative; padding-bottom: 28px; }
.step:last-child { padding-bottom: 0; }
.step::before {
  content: ""; position: absolute; left: 19px; top: 46px; bottom: 6px;
  border-left: 2px dashed rgba(37, 99, 235, 0.4);
}
.step:last-child::before { display: none; }
.step-num {
  flex-shrink: 0;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  font-family: var(--hand); font-size: 22px; color: var(--blue);
  background: rgba(37, 99, 235, 0.08);
  border-radius: 50%;
}
.step-body h3 { font-family: var(--hand); font-size: 20px; font-weight: 400; padding-top: 4px; }
.step-body p { margin-top: 4px; font-size: 14.5px; color: var(--ink-2); }
.step-body code {
  font-family: var(--mono); font-size: 13px;
  background: rgba(30, 45, 79, 0.07); color: var(--blue);
  padding: 2px 7px; border-radius: 6px;
}

/* 架构图 */
.arch-wrap {
  margin-top: 22px; background: var(--card);
  border: 2px solid rgba(30, 45, 79, 0.14);
  border-radius: var(--r-hand);
  padding: 20px; overflow-x: auto;
}
.arch-wrap svg { display: block; margin: 0 auto; min-width: 620px; }

/* 手记：玫红侧边（结论性质） */
.notes { margin-top: 18px; display: flex; flex-direction: column; gap: 14px; }
.note {
  background: rgba(225, 29, 72, 0.045);
  border: 1.5px solid rgba(225, 29, 72, 0.2);
  border-left: 4px solid var(--magenta);
  border-radius: 12px;
  padding: 16px 20px; font-size: 14.5px; color: #6b2035;
}

/* 页脚 */
.footer {
  margin-top: 72px; border-top: 1px dashed var(--line);
  padding: 30px 24px; text-align: center;
  color: var(--ink-3); font-size: 13.5px;
}

/* 空状态 */
.empty { text-align: center; padding: 60px 24px; color: var(--ink-3); }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .hero h1 { font-size: 38px; }
  .hero { padding: 60px 24px 48px; }
  .why-row { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .detail-head h1 { font-size: 32px; }
  .section h2 { font-size: 27px; }
}