/* ===== 基础与主题 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #f6f7fb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #4f8cff;
  --accent-2: #9b6bff;
  --card-bg: #ffffff;
  --nav-bg: rgba(255,255,255,0.85);
  --border: rgba(0,0,0,0.06);
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
}

body.dark {
  --bg: #171a21;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #6ea8ff;
  --accent-2: #b794ff;
  --card-bg: #22262f;
  --nav-bg: rgba(23,26,33,0.85);
  --border: rgba(255,255,255,0.08);
  --shadow: 0 10px 30px rgba(0,0,0,0.45);
}

body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

/* ===== 背景装饰 ===== */
.bg-decor { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.35; }
.blob-1 { width: 460px; height: 460px; background: var(--accent); top: -140px; left: -120px; }
.blob-2 { width: 380px; height: 380px; background: var(--accent-2); top: 35%; right: -160px; }
.blob-3 { width: 320px; height: 320px; background: #6ee7b7; bottom: -120px; left: 25%; }
body.dark .blob { opacity: 0.16; }
.dot-grid {
  position: absolute; inset: 0;
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 26px 26px; opacity: 0.8;
}

/* ===== 导航 ===== */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 40px;
  transition: background 0.3s, box-shadow 0.3s;
  z-index: 100;
}
#navbar.scrolled {
  background: var(--nav-bg);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  backdrop-filter: blur(10px);
}
.logo { font-weight: 700; color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--text); text-decoration: none; font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent); }
#themeBtn {
  background: none; border: 1px solid var(--muted); border-radius: 50%;
  width: 34px; height: 34px; cursor: pointer; font-size: 1rem;
  transition: transform 0.2s;
}
#themeBtn:hover { transform: rotate(20deg); }

/* ===== Hero：不对称布局 ===== */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: 40px;
  padding: 120px 8vw 80px;
}
.hero-text { max-width: 560px; }
.greeting { color: var(--muted); font-size: 1.05rem; }
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  line-height: 1.1;
  margin: 10px 0 18px;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tagline { color: var(--muted); margin-bottom: 26px; font-size: 1.05rem; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
.btn {
  display: inline-block; padding: 12px 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; text-decoration: none; border: none; cursor: pointer;
  border-radius: 999px; font-weight: 600; font-size: 0.95rem;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(79,140,255,0.35); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--muted); }
.btn-ghost:hover { box-shadow: none; border-color: var(--accent); color: var(--accent); }
.hero-meta { display: flex; gap: 18px; flex-wrap: wrap; color: var(--muted); font-size: 0.9rem; }

/* 头像 + 浮动徽标 */
.hero-avatar {
  position: relative; width: 300px; height: 300px;
  justify-self: center;
}
.avatar-ring {
  position: absolute; inset: -16px; border-radius: 50%;
  border: 2px dashed var(--accent); opacity: 0.6;
  animation: spin 22s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.avatar-placeholder {
  position: absolute; inset: 0; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 6.5rem; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: var(--shadow);
}
.float-badge {
  position: absolute; padding: 6px 14px; border-radius: 999px;
  background: var(--card-bg); border: 1px solid var(--border);
  box-shadow: var(--shadow); font-size: 0.8rem; font-weight: 600;
  animation: float 4s ease-in-out infinite;
}
.badge-1 { top: 6%; left: -8%; animation-delay: 0s; }
.badge-2 { top: 42%; right: -12%; animation-delay: 0.8s; }
.badge-3 { bottom: 8%; left: 4%; animation-delay: 1.6s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ===== 通用 section ===== */
main { max-width: 1040px; margin: 0 auto; padding: 0 6vw; }
section { padding: 80px 0; }
section h2 {
  font-size: 1.6rem; margin-bottom: 36px;
  display: inline-flex; align-items: center; gap: 8px;
  position: relative;
}
.h2-icon { font-size: 1.3rem; }
section h2::after {
  content: ""; position: absolute; left: 0; bottom: -8px;
  width: 52px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

/* ===== Bento 拼贴 ===== */
.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 120px;
  gap: 16px;
}
.bento-item {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 18px; padding: 20px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; justify-content: center;
  transition: transform 0.25s;
}
.bento-item:hover { transform: translateY(-4px); }
.bento-label {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 1px;
  color: var(--muted); margin-bottom: 8px;
}
.bento-large { grid-column: span 2; grid-row: span 2; }
.bento-tall { grid-row: span 2; }
.bento-wide { grid-column: span 2; }
.bento-gradient {
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  color: #fff; border: none;
}
.bento-gradient .bento-label { color: rgba(255,255,255,0.75); }
.bento-big { font-size: 1.8rem; font-weight: 700; line-height: 1.2; }
.bento-accent {
  align-items: flex-start; justify-content: center;
  background: linear-gradient(140deg, rgba(79,140,255,0.12), rgba(155,107,255,0.12));
}
.bento-accent strong {
  font-size: 2rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.bento-accent span { font-size: 0.85rem; color: var(--muted); }

/* ===== 技能云 ===== */
.skill-cloud { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.skill-tag {
  border-radius: 999px; background: var(--card-bg);
  border: 1px solid var(--border); box-shadow: var(--shadow);
  transition: transform 0.2s, color 0.2s;
  cursor: default;
}
.skill-tag:hover { transform: translateY(-4px) rotate(-2deg); color: var(--accent); }
.size-lg { padding: 14px 30px; font-size: 1.15rem; font-weight: 700; }
.size-md { padding: 10px 24px; font-size: 1rem; }
.size-sm { padding: 7px 18px; font-size: 0.85rem; }

/* ===== 错位项目卡片 ===== */
.project-stagger {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}
.project-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 20px; overflow: hidden; box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}
.project-card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px rgba(0,0,0,0.15); }
.offset-down { margin-top: 48px; }
.card-cover {
  height: 150px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 1.3rem; letter-spacing: 3px;
  position: relative; overflow: hidden;
}
.card-cover::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.25) 1px, transparent 1px);
  background-size: 18px 18px;
}
.cover-1 { background: linear-gradient(135deg, #4f8cff, #6ee7b7); }
.cover-2 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.cover-3 { background: linear-gradient(135deg, #8b5cf6, #ec4899); }
.project-card h3 { font-size: 1.1rem; margin: 16px 18px 6px; }
.project-card p { font-size: 0.9rem; margin: 0 18px 12px; color: var(--muted); }
.project-tag {
  display: inline-block; margin: 0 18px 18px; padding: 4px 12px;
  font-size: 0.75rem; border-radius: 999px;
  background: rgba(79,140,255,0.12); color: var(--accent);
}

/* ===== 联系分栏 ===== */
.contact-split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 14px; }
.contact-item {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 20px; border-radius: 14px;
  background: var(--card-bg); border: 1px solid var(--border);
  box-shadow: var(--shadow); font-size: 0.95rem;
}
.msg-form {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 20px; padding: 24px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 14px;
}
.form-title { font-weight: 600; margin-bottom: 4px; }
.msg-form input {
  padding: 12px 18px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--bg);
  color: var(--text); font-size: 0.95rem; outline: none;
  transition: border-color 0.2s;
}
.msg-form input:focus { border-color: var(--accent); }
.msg-tip { color: #10b981; font-size: 0.85rem; display: none; }
.msg-tip.show { display: block; }

/* 页脚与回到顶部 */
footer { text-align: center; padding: 40px 0; color: var(--muted); font-size: 0.85rem; }
#backTop {
  position: fixed; right: 24px; bottom: 24px;
  width: 44px; height: 44px; border-radius: 50%;
  border: none; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; font-size: 1.1rem; cursor: pointer;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s, transform 0.2s;
  z-index: 99; box-shadow: var(--shadow);
}
#backTop.show { opacity: 1; pointer-events: auto; }
#backTop:hover { transform: translateY(-3px); }

.fade-in { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 130px; }
  .hero-actions, .hero-meta { justify-content: center; }
  .hero-avatar { width: 220px; height: 220px; margin-top: 20px; }
  .avatar-placeholder { font-size: 4.5rem; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento-large { grid-column: span 2; }
  .bento-wide { grid-column: span 2; }
  .project-stagger { grid-template-columns: 1fr; }
  .offset-down { margin-top: 0; }
  .contact-split { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  #navbar { padding: 12px 18px; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 0.85rem; }
  .bento { grid-template-columns: 1fr; }
  .bento-large, .bento-wide { grid-column: span 1; }
  .size-lg { font-size: 1rem; padding: 12px 22px; }
}
.project-card h3 { font-size: 1.4rem; }
.card-cover span { font-size: 2.3rem; }
.bento-big { font-size: 1.1rem; }
/* 数字变大 */
.bento-accent strong { font-size: 2.8rem; }

/* 说明文字略大 */
.bento-accent span { font-size: 1rem; }

/* 方框内边距变大，格子本身也会跟着撑高 */
.bento-accent { padding: 28px 24px; }

.bento-label { font-size: 1rem; }

.bento-accent strong { font-size: 1rem; }   /* 数字 6+ 变小，原来 2.8rem */
.bento-accent span { font-size: 1rem; }    /* “掌握技能”变大，原来 1rem */

.float-badge {
  font-size: 1.1rem;
  padding: 10px 20px;
  font-weight: 700;
}

.badge-1 { top: 2%; left: -14%; }
.badge-2 { top: 40%; right: -18%; }
.badge-3 { bottom: 2%; left: 0%; }