/* =========================================================
   yvfng 首页 · 作品集视觉（蓝青橙）
   基于参考作品集 style.css 改造：深/浅双主题 + 蓝#6c8cff/青#4de0c4/橙#f6a94c
   无外部依赖，离线可用。首页专属；工具页仍用各自的内联样式 + theme.css
   ========================================================= */

:root {
  /* ---- 深色（默认主视觉） ---- */
  --bg: #0b0e14;
  --bg-soft: #11151f;
  --card: #161b28;
  --card-hover: #1b2133;
  --border: #252c3f;
  --text: #e7ecf5;
  --muted: #8b94a8;
  --accent: #6c8cff;
  --accent-2: #4de0c4;
  --accent-3: #f6a94c;
  --success: #3ecf8e;
  --wip: #f6a94c;
  --glow-1: rgba(108, 140, 255, .16);
  --glow-2: rgba(77, 224, 196, .12);
  --nav-bg: rgba(11, 14, 20, .72);
  --nav-bg-solid: rgba(11, 14, 20, .96);
  --shadow: 0 12px 36px rgba(0, 0, 0, .35);
  --shot-1: rgba(108, 140, 255, .22);
  --shot-2: rgba(77, 224, 196, .14);
  --chip: rgba(255, 255, 255, .03);
  --chip-strong: rgba(255, 255, 255, .06);
  --btn-fg: #ffffff;

  --radius: 16px;
  --font: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, "Courier New", monospace;
}

/* ---- 浅色主题：低饱和暖灰底 + 降亮降饱和强调色（独立设计，非反色） ---- */
html[data-theme="light"] {
  --bg: #f7f4ef;
  --bg-soft: #efeae1;
  --card: #ffffff;
  --card-hover: #fdfbf7;
  --border: #e3ddd2;
  --text: #2b2823;
  --muted: #726c62;
  --accent: #3f56b8;
  --accent-2: #1f8f79;
  --accent-3: #b4761f;
  --success: #178a56;
  --wip: #a9761c;
  --glow-1: rgba(63, 86, 184, .10);
  --glow-2: rgba(31, 143, 121, .09);
  --nav-bg: rgba(247, 244, 239, .78);
  --nav-bg-solid: rgba(247, 244, 239, .97);
  --shadow: 0 12px 30px rgba(43, 40, 35, .10);
  --shot-1: rgba(63, 86, 184, .16);
  --shot-2: rgba(31, 143, 121, .11);
  --chip: rgba(43, 40, 35, .035);
  --chip-strong: rgba(43, 40, 35, .07);
  --btn-fg: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1000px 520px at 85% -10%, var(--glow-1), transparent 60%),
    radial-gradient(800px 420px at -10% 8%, var(--glow-2), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background-color .3s ease, color .3s ease;
}
a { color: inherit; }
/* 链接型卡片（工具卡 / 教程卡整卡可点）去掉文字下划线，靠 hover 变色反馈 */
a.card, a.card *, a.card h3, a.card p, a.card .card-title, a.card .card-desc,
a.tu-card, a.tu-card * { text-decoration: none; }

/* ================= Nav ================= */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .02em; font-size: 1.05rem; }
.brand-dot {
  width: 12px; height: 12px; border-radius: 4px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 14px var(--glow-1);
}
.nav-right { display: flex; align-items: center; gap: 10px; }
.nav-links { display: flex; gap: 4px; list-style: none; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); text-decoration: none; font-size: .92rem;
  padding: 6px 12px; border-radius: 999px; transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: var(--chip-strong); }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--border); background: var(--chip); color: var(--text);
  transition: border-color .2s, background .2s, transform .2s;
}
.icon-btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.icon-btn svg { width: 18px; height: 18px; display: block; }
.menu-toggle { display: none; }
/* 主题图标随主题切换显隐 */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
html[data-theme="light"] .theme-toggle .icon-sun { display: block; }
html[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ================= Layout ================= */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
section { padding: 84px 0; scroll-margin-top: 64px; }

/* ================= Hero ================= */
.hero { min-height: 74vh; display: flex; flex-direction: column; justify-content: center; }
.hero-inner { max-width: 780px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; color: var(--accent-2);
  border: 1px solid color-mix(in srgb, var(--accent-2) 40%, transparent);
  background: color-mix(in srgb, var(--accent-2) 10%, transparent);
  padding: 5px 14px; border-radius: 999px; margin-bottom: 26px; letter-spacing: .08em;
}
.eyebrow .pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); animation: pulse 1.8s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .4; transform: scale(.7); } }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); line-height: 1.18; font-weight: 800; letter-spacing: -.02em; }
h1 .grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { margin-top: 22px; font-size: 1.12rem; color: var(--muted); max-width: 640px; }
.hero-keywords { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.tag {
  font-size: .82rem; padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--chip); color: var(--text);
}
.tag i { font-style: normal; color: var(--accent-2); margin-right: 4px; }
.hero-cta { margin-top: 38px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px; text-decoration: none;
  font-weight: 600; font-size: .95rem; border: 1px solid transparent; cursor: pointer;
  transition: transform .18s, box-shadow .18s, background .18s, border-color .18s, color .18s;
}
.btn-primary {
  background: var(--accent);
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 78%, #000));
  color: var(--btn-fg); box-shadow: 0 8px 24px var(--glow-1);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px var(--glow-1); }
.btn-ghost { border-color: var(--border); color: var(--text); background: var(--chip); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
/* 卡片内的小号"打开/下载"按钮 */
.btn-sm { padding: 8px 16px; font-size: .85rem; }

/* ================= Section head ================= */
.sec-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 40px; flex-wrap: wrap; }
.sec-index { font-family: var(--mono); color: var(--accent); font-size: .95rem; }
.sec-title { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; }
.sec-sub { color: var(--muted); font-size: .95rem; }

/* ================= About ================= */
.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.about-item {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; transition: border-color .25s, transform .25s, background .25s;
}
.about-item:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); background: var(--card-hover); transform: translateY(-3px); }
.about-icon {
  width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 1.35rem; margin-bottom: 16px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
}
.about-item:nth-child(2) .about-icon {
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent-2) 30%, transparent);
}
.about-item:nth-child(3) .about-icon {
  background: color-mix(in srgb, var(--accent-3) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent-3) 30%, transparent);
}
.about-item h3 { font-size: 1.08rem; margin-bottom: 8px; }
.about-item p { color: var(--muted); font-size: .93rem; }
.about-item p b { color: var(--text); font-weight: 600; }

/* ================= Timeline ================= */
.timeline { position: relative; margin-top: 8px; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2), transparent);
  opacity: .55;
}
.tl-item { position: relative; padding: 0 0 34px 0; }
.tl-item:last-child { padding-bottom: 0; }
.tl-node {
  position: absolute; left: -34px; top: 6px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent);
}
.tl-item:nth-child(2) .tl-node { border-color: color-mix(in srgb, var(--accent) 80%, var(--accent-2)); }
.tl-item:nth-child(3) .tl-node { border-color: var(--accent-2); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-2) 14%, transparent); }
.tl-item:nth-child(4) .tl-node { border-color: var(--accent-3); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-3) 14%, transparent); }
.tl-stage {
  display: inline-block; font-family: var(--mono); font-size: .74rem; letter-spacing: .06em;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  padding: 2px 10px; border-radius: 999px; margin-bottom: 8px;
}
.tl-title { font-size: 1.06rem; font-weight: 700; margin-bottom: 4px; }
.tl-desc { color: var(--muted); font-size: .93rem; }
.tl-date { color: var(--muted); font-size: .78rem; font-family: var(--mono); opacity: .75; }

/* ================= Filter bar ================= */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.filter-btn {
  font-family: var(--font); font-size: .88rem; font-weight: 600; cursor: pointer;
  padding: 8px 18px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--chip); color: var(--muted);
  transition: color .2s, border-color .2s, background .2s, transform .2s;
}
.filter-btn:hover { color: var(--text); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); transform: translateY(-1px); }
.filter-btn.active {
  color: var(--btn-fg); border-color: transparent;
  background: var(--accent);
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 70%, var(--accent-2)));
  box-shadow: 0 6px 18px var(--glow-1);
}

/* ================= Platform blocks ================= */
.platform { margin-bottom: 46px; }
.platform.is-hidden { display: none; }
.platform-head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.platform-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .82rem; font-weight: 700; padding: 5px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--chip-strong);
}
.platform-badge .icon { font-size: 1rem; }
.platform-desc { color: var(--muted); font-size: .9rem; }

/* ================= Cards ================= */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
/* 在线工具区用更密的卡片 */
.grid.dense { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.card {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; overflow: hidden;
  display: flex; flex-direction: column; gap: 14px;
  transition: transform .25s, border-color .25s, background .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); background: var(--card-hover); box-shadow: var(--shadow); }
.card.is-hidden { display: none; }
.card.fade-in { animation: cardIn .38s ease both; }
@keyframes cardIn { from { opacity: 0; transform: translateY(10px) scale(.99); } to { opacity: 1; transform: none; } }
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), transparent 70%);
  opacity: 0; transition: opacity .25s;
}
.card:hover::before { opacity: 1; }
.platform[data-platform="android"] .card::before { background: linear-gradient(90deg, var(--accent-2), color-mix(in srgb, var(--accent-2) 50%, #fff), transparent 70%); }
.platform[data-platform="minigame"] .card::before { background: linear-gradient(90deg, var(--accent-3), color-mix(in srgb, var(--accent-3) 55%, #fff), transparent 70%); }
.platform[data-platform="online"] .card::before { background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3), transparent 80%); }

.card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.card-title { font-size: 1.2rem; font-weight: 700; letter-spacing: .01em; }
.card-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.badge {
  font-size: .7rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; white-space: nowrap;
  border: 1px solid var(--border); color: var(--muted); background: var(--chip);
}
.badge.accent { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.badge.success { color: var(--success); border-color: color-mix(in srgb, var(--success) 45%, transparent); background: color-mix(in srgb, var(--success) 10%, transparent); }
.badge.wip { color: var(--wip); border-color: color-mix(in srgb, var(--wip) 45%, transparent); background: color-mix(in srgb, var(--wip) 10%, transparent); }
.badge.planned { color: var(--muted); border-color: var(--border); background: var(--chip); }
.card-desc { color: var(--muted); font-size: .93rem; }

/* ---------- 图标位（无截图时用 emoji 渐变占位，小） ---------- */
.shot {
  position: relative; width: 100%; aspect-ratio: 16 / 10;
  border-radius: 12px; overflow: hidden; border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--shot-1), var(--shot-2)), var(--bg-soft);
}
.grid.dense .shot { aspect-ratio: 16 / 9; }
.shot-ph {
  position: absolute; inset: 0; z-index: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; padding: 14px; text-align: center; color: var(--muted);
}
.shot-ph .ph-icon { font-size: 2rem; opacity: .8; }
.shot-ph .ph-text { font-size: .74rem; }
.shot-img { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; object-fit: cover; display: block; }

/* ---------- 详情展开 ---------- */
.card-detail { border-top: 1px dashed var(--border); padding-top: 12px; }
.detail-toggle {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  background: none; border: none; padding: 0; color: var(--accent);
  font-family: var(--font); font-size: .84rem; font-weight: 600;
}
.detail-toggle .caret { transition: transform .28s ease; display: inline-block; font-size: .7rem; }
.card-detail.open .detail-toggle .caret { transform: rotate(90deg); }
.detail-body { overflow: hidden; max-height: 0; opacity: 0; transition: max-height .35s ease, opacity .3s ease, margin-top .3s ease; }
.card-detail.open .detail-body { opacity: 1; margin-top: 10px; }
.detail-body p { color: var(--muted); font-size: .9rem; }
.detail-body p + p { margin-top: 8px; }
.detail-body b { color: var(--text); font-weight: 600; }

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tech {
  font-size: .74rem; font-family: var(--mono); color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 24%, transparent);
  padding: 2px 9px; border-radius: 6px;
}
.feat-list { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 14px; }
.feat-list li { font-size: .84rem; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.feat-list li::before { content: "✦"; color: var(--accent); font-size: .7rem; }
.card-foot { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: auto; }
.status { font-size: .78rem; display: inline-flex; align-items: center; gap: 6px; color: var(--muted); }
.status .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.status.online .dot { background: var(--success); box-shadow: 0 0 8px color-mix(in srgb, var(--success) 80%, transparent); }
.status.dev .dot { background: var(--wip); box-shadow: 0 0 8px color-mix(in srgb, var(--wip) 80%, transparent); }

/* ================= Tutorials ================= */
.tu-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.tu-card {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; text-decoration: none; color: var(--text);
  transition: transform .25s, border-color .25s, background .25s;
}
.tu-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent-2) 55%, var(--border)); background: var(--card-hover); }
.tu-eyebrow { font-size: .72rem; color: var(--accent-2); font-family: var(--mono); }
.tu-card h3 { font-size: 1rem; font-weight: 700; line-height: 1.35; }
.tu-card p { color: var(--muted); font-size: .86rem; }
.tu-foot { display: flex; justify-content: space-between; align-items: center; margin-top: auto; font-size: .8rem; color: var(--muted); }
.tu-foot .read { color: var(--accent); font-weight: 600; }

/* ================= Collab CTA ================= */
.collab { padding: 0 0 84px; }
.collab-inner {
  position: relative; overflow: hidden; text-align: center;
  border: 1px solid var(--border); border-radius: 22px; padding: 54px 28px;
  background:
    radial-gradient(600px 260px at 20% 0%, var(--glow-1), transparent 70%),
    radial-gradient(520px 240px at 90% 100%, var(--glow-2), transparent 70%),
    var(--card);
}
.collab-inner h2 { font-size: clamp(1.4rem, 3.4vw, 2rem); font-weight: 800; letter-spacing: -.01em; }
.collab-inner p { color: var(--muted); margin: 14px auto 28px; max-width: 560px; font-size: .98rem; }
.collab-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.collab-mail { font-family: var(--mono); font-size: .84rem; color: var(--muted); margin-top: 20px; }

/* ================= Contact ================= */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.contact-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; text-align: center; transition: border-color .25s, transform .25s;
}
.contact-card:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); transform: translateY(-3px); }
.contact-card .big { font-size: 1.6rem; margin-bottom: 10px; }
.contact-card h3 { font-size: 1rem; margin-bottom: 6px; }
.contact-card p { color: var(--muted); font-size: .88rem; word-break: break-all; }
.contact-card p.placeholder { font-family: var(--mono); color: var(--accent); font-size: .9rem; }
.contact-card a.placeholder { text-decoration: none; }
.contact-card a.placeholder:hover { text-decoration: underline; }
.contact-note { text-align: center; color: var(--muted); font-size: .82rem; margin-top: 22px; }

/* ================= Footer ================= */
footer { border-top: 1px solid var(--border); padding: 34px 24px; text-align: center; color: var(--muted); font-size: .85rem; }
footer .quote { margin-bottom: 8px; color: var(--text); opacity: .78; }
footer .quote i { font-style: normal; color: var(--accent-2); }

/* ================= Reveal ================= */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ================= Responsive ================= */
@media (max-width: 720px) {
  .nav-links {
    display: none; width: 100%; flex-direction: column; padding: 8px 0 12px;
    background: var(--nav-bg-solid); border-top: 1px solid var(--border); border-radius: 0 0 12px 12px;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: inline-flex; }
  .nav-inner { flex-wrap: wrap; }
  .nav-right { margin-left: auto; }
  section { padding: 62px 0; }
  .hero { min-height: auto; padding-top: 68px; }
  .grid, .tu-grid { grid-template-columns: 1fr; }
  .card { padding: 20px; }
  .timeline { padding-left: 28px; }
  .tl-node { left: -28px; }
  .collab { padding-bottom: 62px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .card.fade-in { animation: none; }
}