/* gakkenpc.com — 全站共用样式 */

:root{
  --color-bg:#f7f8fb;
  --color-surface:#ffffff;
  --color-surface-alt:#eef1f8;
  --color-border:#e2e5ee;
  --color-text:#1b2030;
  --color-text-muted:#5a6072;
  --color-primary:#2d5bff;
  --color-primary-dark:#1d3fc7;
  --color-primary-light:#eaf0ff;
  --color-accent:#00b894;
  --color-warning:#f5a623;
  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;
  --shadow-sm:0 1px 2px rgba(20,24,40,.06);
  --shadow-md:0 8px 24px rgba(20,24,40,.08);
  --max-width:1120px;
  --font-base: "PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-base);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--color-primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.35;font-weight:700;margin:0 0 .6em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.4em}
.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--color-border);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.15rem;color:var(--color-text)}
.brand:hover{text-decoration:none}
.brand .logo-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--color-primary),#7b5bff);
  color:#fff;font-size:1rem;font-weight:800;
}
.main-nav{display:flex;align-items:center;gap:26px}
.main-nav a{color:var(--color-text);font-weight:500;font-size:.95rem;position:relative}
.main-nav a:hover{color:var(--color-primary);text-decoration:none}
.nav-cta{
  background:var(--color-primary);color:#fff !important;
  padding:9px 18px;border-radius:999px;font-weight:600 !important;
}
.nav-cta:hover{background:var(--color-primary-dark)}
.nav-toggle{display:none;background:none;border:1px solid var(--color-border);border-radius:8px;width:40px;height:40px;cursor:pointer}
.nav-toggle span,.nav-toggle::before,.nav-toggle::after{
  content:"";display:block;width:18px;height:2px;background:var(--color-text);margin:4px auto;
}

@media (max-width:860px){
  .main-nav{
    position:fixed;top:64px;left:0;right:0;height:calc(100vh - 64px);
    background:#fff;flex-direction:column;align-items:flex-start;
    padding:20px 24px;gap:0;transform:translateY(-110%);transition:transform .25s ease;overflow-y:auto;
    visibility:hidden;
  }
  .main-nav.open{transform:translateY(0);visibility:visible}
  .main-nav a{padding:14px 0;width:100%;border-bottom:1px solid var(--color-border)}
  .nav-toggle{display:block}
}

/* ---------- Hero ---------- */
.hero{padding:56px 0 48px;background:linear-gradient(180deg,#eef2ff 0%,var(--color-bg) 100%)}
.hero h1{font-size:2rem;max-width:820px}
.hero p.lead{font-size:1.1rem;color:var(--color-text-muted);max-width:720px}
.breadcrumb{font-size:.85rem;color:var(--color-text-muted);margin-bottom:14px}
.breadcrumb a{color:var(--color-text-muted)}
.breadcrumb span[aria-hidden]{margin:0 6px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:10px;border:0;cursor:pointer;
  font-weight:700;font-size:.95rem;font-family:inherit;
}
.btn-primary{background:var(--color-primary);color:#fff}
.btn-primary:hover{background:var(--color-primary-dark);text-decoration:none}
.btn-outline{background:#fff;color:var(--color-primary);border:1px solid var(--color-primary)}
.btn-outline:hover{background:var(--color-primary-light);text-decoration:none}
.btn-sm{padding:8px 14px;font-size:.85rem;border-radius:8px}

/* ---------- Sections ---------- */
section{padding:48px 0}
.section-head{max-width:720px;margin-bottom:28px}
.section-head h2{font-size:1.6rem}
.section-head p{color:var(--color-text-muted)}
.section-alt{background:var(--color-surface)}

/* ---------- Cards / Grids ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px}
.card{
  background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);
  padding:20px;box-shadow:var(--shadow-sm);
}
.card h3{font-size:1.05rem;margin-bottom:8px}
.card p{color:var(--color-text-muted);font-size:.92rem;margin-bottom:0}
.country-card{display:flex;align-items:center;gap:12px}
.country-card .flag{font-size:1.8rem;line-height:1}
.country-card a{color:var(--color-text);font-weight:700}
.country-card .dial{color:var(--color-text-muted);font-size:.85rem}

/* ---------- Phone number generator ---------- */
.generator-panel{
  background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);
  padding:28px;box-shadow:var(--shadow-md);
}
.generator-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin-bottom:20px}
.generator-toolbar .count-label{color:var(--color-text-muted);font-size:.9rem}
.number-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.number-chip{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:var(--color-surface-alt);border:1px solid var(--color-border);border-radius:10px;
  padding:14px 16px;font-variant-numeric:tabular-nums;
}
.number-chip .num{font-weight:700;font-size:1.02rem;letter-spacing:.2px}
.number-chip button{
  background:#fff;border:1px solid var(--color-border);border-radius:7px;width:32px;height:32px;
  cursor:pointer;font-size:.9rem;color:var(--color-text-muted);flex:none;
}
.number-chip button:hover{color:var(--color-primary);border-color:var(--color-primary)}
.number-chip button.copied{color:var(--color-accent);border-color:var(--color-accent)}
.generator-foot{display:flex;align-items:center;justify-content:center;margin-top:22px}
.disclaimer-box{
  margin-top:20px;padding:14px 16px;background:#fff7e8;border:1px solid #f5d898;border-radius:10px;
  color:#8a6116;font-size:.85rem;
}

/* ---------- Instructions / numbered steps ---------- */
.steps{list-style:none;padding:0;margin:0;display:grid;gap:16px}
.steps li{display:flex;gap:16px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:18px 20px}
.steps .step-num{
  flex:none;width:34px;height:34px;border-radius:50%;background:var(--color-primary-light);color:var(--color-primary);
  display:flex;align-items:center;justify-content:center;font-weight:800;
}
.steps h3{margin-bottom:4px;font-size:1rem}
.steps p{margin:0;color:var(--color-text-muted);font-size:.92rem}

.use-case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}

/* ---------- FAQ (accordion) ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}
.faq-question{
  width:100%;text-align:left;background:none;border:0;padding:18px 20px;font-size:1rem;font-weight:700;
  cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--color-text);font-family:inherit;
}
.faq-question::after{content:"+";font-size:1.3rem;color:var(--color-primary);flex:none;font-weight:400;transition:transform .2s}
.faq-item.open .faq-question::after{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-answer-inner{padding:0 20px 18px;color:var(--color-text-muted);font-size:.93rem}
.faq-item.open .faq-answer{max-height:600px}

/* ---------- Article ---------- */
.article-body{max-width:760px;margin:0 auto}
.article-body h2{font-size:1.35rem;margin-top:1.6em}
.article-body h3{font-size:1.1rem;margin-top:1.3em}
.article-body img{border-radius:var(--radius-md);margin:1.2em 0}
.article-body figure{margin:1.4em 0}
.article-body figcaption{font-size:.82rem;color:var(--color-text-muted);margin-top:6px;text-align:center}
.article-meta{color:var(--color-text-muted);font-size:.88rem;margin-bottom:1.6em;display:flex;gap:14px;flex-wrap:wrap}
.article-body blockquote{
  border-left:4px solid var(--color-primary);margin:1.4em 0;padding:4px 20px;color:var(--color-text-muted);background:var(--color-surface-alt);border-radius:0 10px 10px 0;
}
.article-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:20px}
.article-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column}
.article-card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.article-card .article-card-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.article-card h3{font-size:1.02rem;margin:0}
.article-card p{color:var(--color-text-muted);font-size:.88rem;margin:0;flex:1}
.tag{display:inline-block;background:var(--color-primary-light);color:var(--color-primary);font-size:.75rem;font-weight:700;padding:4px 10px;border-radius:999px;width:fit-content}

/* ---------- Comparison table (best SMS services article) ---------- */
.compare-table-wrap{overflow-x:auto;margin:1.4em 0}
table.compare-table{width:100%;border-collapse:collapse;min-width:640px;background:var(--color-surface)}
table.compare-table th,table.compare-table td{border:1px solid var(--color-border);padding:10px 14px;text-align:left;font-size:.92rem}
table.compare-table th{background:var(--color-surface-alt)}
table.compare-table tr.rank-1 td{background:#eafff6}
.badge-rank1{display:inline-block;background:var(--color-accent);color:#fff;font-size:.72rem;font-weight:800;padding:2px 8px;border-radius:6px;margin-right:6px}

.service-review{border:1px solid var(--color-border);border-radius:var(--radius-md);padding:20px 22px;margin:1.2em 0;background:var(--color-surface)}
.service-review.top{border-color:var(--color-accent);background:#f3fffb}
.service-review h3{display:flex;align-items:center;gap:10px;margin-bottom:8px;font-size:1.08rem}
.service-shot{
  border:1px solid var(--color-border);border-radius:10px;overflow:hidden;margin:10px 0 14px;
  box-shadow:var(--shadow-sm);background:var(--color-surface-alt);
}
.service-shot img{display:block;width:100%;height:auto;margin:0}

/* ---------- About / contact ---------- */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:start}
@media (max-width:860px){.about-grid{grid-template-columns:1fr}}
.contact-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-sm)}
.contact-row{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--color-border)}
.contact-row:last-child{border-bottom:0}
.contact-row .icon{flex:none;width:22px;text-align:center}
.contact-row .label{color:var(--color-text-muted);font-size:.8rem;display:block}
.map-frame{width:100%;border:0;border-radius:var(--radius-md);height:280px;margin-top:18px}

form.contact-form{display:grid;gap:14px}
.contact-form label{display:block;font-size:.88rem;font-weight:600;margin-bottom:6px}
.contact-form input,.contact-form textarea{
  width:100%;padding:11px 13px;border:1px solid var(--color-border);border-radius:8px;font-family:inherit;font-size:.95rem;background:#fff;
}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid var(--color-primary);outline-offset:1px}
.form-success{
  display:none;background:#eafff6;border:1px solid #9be8cc;color:#0a7a52;padding:14px 16px;border-radius:10px;margin-bottom:16px;font-weight:600;
}
.form-success.visible{display:block}

/* ---------- Footer ---------- */
.site-footer{background:#161a2b;color:#c7cbe0;padding:48px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:28px}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr}}
.site-footer h4{color:#fff;font-size:.92rem;margin-bottom:14px}
.site-footer a{color:#c7cbe0;font-size:.88rem}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:9px}
.footer-brand p{color:#9aa0bf;font-size:.86rem;max-width:320px}
.footer-bottom{border-top:1px solid #2a2f48;margin-top:36px;padding-top:20px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;color:#8c92b0;font-size:.82rem}
.footer-bottom a{color:#8c92b0}

/* ---------- Misc ---------- */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media (max-width:760px){.two-col{grid-template-columns:1fr}}
.pill-list{display:flex;flex-wrap:wrap;gap:10px}
.pill-list a,.pill-list span{
  background:var(--color-surface);border:1px solid var(--color-border);padding:8px 14px;border-radius:999px;font-size:.85rem;color:var(--color-text);
}
.pill-list a:hover{border-color:var(--color-primary);color:var(--color-primary);text-decoration:none}
.toc{background:var(--color-surface-alt);border-radius:var(--radius-md);padding:18px 22px;margin:0 0 2em}
.toc h2{font-size:1rem;margin-bottom:10px}
.toc ol{margin:0;padding-left:1.2em;font-size:.92rem}
.legal-body h2{font-size:1.2rem;margin-top:1.6em}
.legal-body{max-width:760px;margin:0 auto}
.stat-row{display:flex;gap:28px;flex-wrap:wrap;margin:20px 0}
.stat-row .stat{min-width:120px}
.stat .num{font-size:1.6rem;font-weight:800;color:var(--color-primary)}
.stat .label{font-size:.82rem;color:var(--color-text-muted)}