/* Zero Out 官网 — Notion × Apple 风格 */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --text-2: #424245;
  --muted: #6e6e73;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --border: rgba(0, 0, 0, 0.09);
  --radius: 18px;
  --maxw: 980px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans CJK JP",
    "Noto Sans CJK KR", "Noto Sans", sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
h1, h2, h3 { letter-spacing: -0.022em; line-height: 1.15; font-weight: 700; }
h1 { font-size: clamp(34px, 5.4vw, 56px); }
h2 { font-size: clamp(26px, 3.6vw, 36px); }
h3 { font-size: 19px; }
p { color: var(--text-2); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Nav */
nav {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.88);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  position: sticky; top: 0; z-index: 10;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 52px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; display: block; }
.langs { display: flex; gap: 14px; font-size: 13px; }
.langs a { color: var(--muted); padding: 2px 0; }
.langs a:hover { color: var(--text); text-decoration: none; }
.langs a.active { color: var(--text); font-weight: 600; }

/* Hero */
.hero { padding: 72px 0 56px; }
.eyebrow { font-size: 14px; font-weight: 600; color: var(--accent); letter-spacing: 0.02em; margin-bottom: 14px; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; align-items: center; }
.hero-sub { font-size: 20px; color: var(--muted); margin-top: 20px; max-width: 34em; }
.cta-row { display: flex; align-items: center; gap: 24px; margin-top: 30px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; font-weight: 600; font-size: 17px;
  padding: 13px 28px; border-radius: 980px; transition: background 0.15s;
}
.btn:hover { background: var(--accent-hover); text-decoration: none; }
.btn img { width: 20px; height: 20px; }
.link-more { font-size: 17px; }
.trust { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 26px; font-size: 14px; color: var(--muted); }
.trust li { list-style: none; display: flex; align-items: center; gap: 6px; }
.trust li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #30d158; flex: none; }
.phone-frame {
  border-radius: 42px; overflow: hidden;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.18), 0 4px 16px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.06);
}
.phone-frame img { display: block; width: 100%; height: auto; }

/* Sections */
section { padding: 76px 0; }
section.alt { background: var(--bg-alt); }
.sec-head { max-width: 44em; margin-bottom: 40px; }
.sec-head p { font-size: 19px; margin-top: 14px; }
.answer-box {
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 26px; margin-top: 34px; font-size: 16px; color: var(--text-2);
}
.answer-box strong { color: var(--text); }

/* Problem list */
.pain-list { list-style: none; display: grid; gap: 14px; margin-top: 8px; }
.pain-list li {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 24px; display: flex; gap: 14px; align-items: flex-start;
}
.pain-list li::before { content: "!"; flex: none; width: 26px; height: 26px; border-radius: 50%;
  background: #ff8a3d; color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center; margin-top: 2px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
.step { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 24px; }
.step::before {
  counter-increment: step; content: counter(step);
  display: inline-flex; width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; font-size: 15px;
  align-items: center; justify-content: center; margin-bottom: 14px;
}
.step h3 { margin-bottom: 8px; }
.step p { font-size: 15px; }
.note {
  margin-top: 26px; font-size: 15px; color: var(--muted);
  padding: 16px 20px; border-left: 3px solid var(--accent);
  background: rgba(0, 113, 227, 0.05); border-radius: 0 12px 12px 0;
}

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { background: var(--bg-alt); border-radius: var(--radius); padding: 26px 24px; }
.feature .icon { font-size: 26px; line-height: 1; margin-bottom: 12px; }
.feature h3 { margin-bottom: 6px; }
.feature p { font-size: 15px; color: var(--muted); }

/* Gallery */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: start; }
.shot { text-align: center; }
.shot img {
  display: block; width: 100%; height: auto; border-radius: 26px;
  border: 1px solid rgba(0, 0, 0, 0.07);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.12);
}
.shot figcaption { font-size: 14px; color: var(--muted); margin-top: 12px; }

/* FAQ — Notion toggle 风格 */
.faq-list { border-top: 1px solid var(--border); }
details { border-bottom: 1px solid var(--border); }
summary {
  list-style: none; cursor: pointer; padding: 22px 2px;
  font-size: 17px; font-weight: 600; color: var(--text);
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 22px; font-weight: 400; color: var(--muted); flex: none; transition: transform 0.2s; }
details[open] summary::after { content: "−"; }
details .a { padding: 0 2px 24px; font-size: 16px; color: var(--text-2); max-width: 46em; }

/* Compare table */
.compare-wrap { overflow-x: auto; border-radius: var(--radius); box-shadow: 0 0 0 1px var(--border); }
.compare { width: 100%; border-collapse: collapse; background: #fff; font-size: 15px; }
.compare th, .compare td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.compare thead th { background: var(--bg-alt); font-size: 13px; color: var(--muted); font-weight: 600; }
.compare tr:last-child td { border-bottom: none; }
.compare .good { color: #248a3d; font-weight: 600; white-space: nowrap; }
.compare .bad { color: #b64400; white-space: nowrap; }
.meta-line { margin-top: 22px; font-size: 14px; color: var(--muted); }

/* Footer */
footer { background: var(--bg-alt); padding: 44px 0 52px; font-size: 14px; color: var(--muted); }
.foot-links { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-bottom: 18px; }
.foot-links a { color: var(--text-2); }
.foot-lang { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-bottom: 18px; }
.disclaimer { line-height: 1.7; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .phone-frame { max-width: 320px; margin: 0 auto; }
  .steps, .feature-grid, .gallery { grid-template-columns: 1fr; }
  .gallery .shot { max-width: 340px; margin: 0 auto; }
  .langs { gap: 10px; }
  .nav-inner { flex-wrap: wrap; height: auto; min-height: 52px; padding: 10px 0; row-gap: 10px; }
  .langs { flex-wrap: wrap; justify-content: flex-start; }
  .brand { font-size: 16px; }
  .compare { font-size: 14px; }
  .compare th, .compare td { padding: 10px 10px; }
}