/* ============================================================
   坪井英語塾 — 統一デザインシステム CSS v2
   全ページ共通（Grok指摘の全デザイン改善対応）
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700;900&family=Poppins:wght@400;600;700&display=swap');

/* --- CSS Variables --- */
:root{
  --navy:#001f4d;
  --blue:#0056b3;
  --blue-light:#2980b9;
  --accent:#ff5733;
  --accent-hover:#e64a2e;
  --green:#0b6b2d;
  --bg:#f5f7fa;
  --bg-warm:#fffaf7;
  --white:#ffffff;
  --gray-50:#f8f9fa;
  --gray-100:#f0f2f5;
  --gray-200:#e2e6ea;
  --gray-400:#adb5bd;
  --gray-600:#6c757d;
  --gray-800:#343a40;
  --text:#2d3436;
  --text-light:#636e72;
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 2px 12px rgba(0,31,77,.06);
  --shadow-lg:0 8px 32px rgba(0,31,77,.10);
  --transition:all .25s cubic-bezier(.4,0,.2,1);
  --font-jp:'Noto Sans JP','Hiragino Sans','Yu Gothic',sans-serif;
  --font-en:'Poppins',var(--font-jp);
}

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-jp);
  color:var(--text);
  background:var(--bg);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:var(--blue);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;border:0;display:block}
strong,b{color:var(--navy);font-weight:700}

/* --- Container --- */
.container{
  width:min(100%,1080px);
  margin:0 auto;
  padding:0 24px;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:14px 32px;
  border-radius:var(--radius-sm);
  font-size:.95rem;
  font-weight:700;
  text-decoration:none;
  cursor:pointer;
  transition:var(--transition);
  border:2px solid transparent;
  line-height:1.4;
}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),#ff7849);
  color:var(--white)!important;
  box-shadow:0 4px 14px rgba(255,87,51,.25);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 6px 20px rgba(255,87,51,.35);
  color:var(--white)!important;
}
.btn-secondary{
  background:var(--white);
  color:var(--navy);
  border-color:var(--gray-200);
  box-shadow:var(--shadow);
}
.btn-secondary:hover{
  border-color:var(--blue);
  color:var(--blue);
  transform:translateY(-1px);
}
.btn-outline{
  background:transparent;
  color:var(--white)!important;
  border-color:rgba(255,255,255,.4);
}
.btn-outline:hover{
  background:rgba(255,255,255,.15);
  color:var(--white)!important;
}
.btn-sm{padding:8px 18px;font-size:.85rem}
.btn-lg{padding:16px 40px;font-size:1.05rem}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--gray-200);
  padding:14px 0;
  position:sticky;
  top:0;
  z-index:100;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.header-brand a{text-decoration:none;display:block}
.header-brand h3{
  font-size:1.2rem;
  color:var(--navy);
  margin:0;line-height:1.2;
  font-weight:900;
  letter-spacing:.02em;
}
.header-brand span{
  font-family:var(--font-en);
  font-size:.7rem;
  color:var(--gray-600);
  display:block;
  letter-spacing:.05em;
}
.header-contact{
  display:flex;
  align-items:center;
  gap:14px;
}
.header-tel{
  font-family:var(--font-en);
  font-size:.85rem;
  color:var(--gray-600);
  font-weight:600;
}
.header-tel a{color:var(--blue)}
.header-tel span{font-weight:700;font-size:.95rem}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-nav{
  background:var(--navy);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.nav-list{
  display:flex;
  list-style:none;
  margin:0;padding:0;
  white-space:nowrap;
}
.nav-list li a{
  display:flex;
  flex-direction:column;
  align-items:center;
  padding:13px 18px;
  color:rgba(255,255,255,.7);
  font-size:.84rem;
  font-weight:600;
  text-decoration:none;
  transition:var(--transition);
  border-bottom:3px solid transparent;
  line-height:1.3;
}
.nav-list li a:hover,
.nav-list li.active a{
  color:var(--white);
  border-bottom-color:var(--accent);
  background:rgba(255,255,255,.06);
}
.nav-sub{
  font-family:var(--font-en);
  font-size:.62rem;
  opacity:.6;
  letter-spacing:.08em;
  text-transform:uppercase;
  margin-top:2px;
}

/* ============================================================
   PAGE HERO
   ============================================================ */
.page-hero{
  background:linear-gradient(135deg,var(--navy) 0%,var(--blue) 50%,var(--blue-light) 100%);
  color:var(--white);
  padding:56px 0 48px;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.page-hero::before{
  content:'';position:absolute;
  top:-50%;right:-20%;
  width:500px;height:500px;
  background:radial-gradient(circle,rgba(255,255,255,.06) 0%,transparent 70%);
  border-radius:50%;
}
.page-hero::after{
  content:'';position:absolute;
  bottom:-30%;left:-10%;
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(255,120,73,.08) 0%,transparent 70%);
  border-radius:50%;
}
.page-hero h1{
  font-size:2rem;
  font-weight:900;
  margin:10px 0;
  letter-spacing:.02em;
  position:relative;z-index:1;
}
.page-hero-sub{
  font-family:var(--font-en);
  font-size:.8rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  opacity:.7;
  margin:0;
  position:relative;z-index:1;
}
.page-hero-lead{
  font-size:.95rem;
  opacity:.85;
  margin:8px 0 0;
  max-width:600px;
  margin-left:auto;margin-right:auto;
  position:relative;z-index:1;
}

/* ============================================================
   CONTENT SECTIONS
   ============================================================ */
.content-section{
  padding:56px 0;
}

/* --- White Card --- */
.content-card{
  background:var(--white);
  border-radius:var(--radius);
  padding:40px 36px;
  box-shadow:var(--shadow);
  margin-bottom:28px;
}
.content-card h2{
  color:var(--navy);
  font-size:1.35rem;
  font-weight:900;
  margin:0 0 20px;
  padding:0 0 12px;
  border-bottom:3px solid var(--blue);
}
.content-card h3{
  color:var(--blue);
  font-size:1.05rem;
  font-weight:700;
  margin:28px 0 12px;
}
.content-card p{
  margin:0 0 14px;
  line-height:1.9;
}
.content-card ul,.content-card ol{
  margin:12px 0 16px 1.5em;
  line-height:2;
}

/* --- Section with heading --- */
.section-heading{
  text-align:center;
  margin-bottom:36px;
}
.section-heading h2{
  font-size:1.6rem;
  font-weight:900;
  color:var(--navy);
  margin:0 0 8px;
}
.section-heading p{
  font-size:.95rem;
  color:var(--text-light);
}

/* --- Feature Grid --- */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:24px;
}
.feature-item{
  background:var(--white);
  border-radius:var(--radius);
  padding:32px 28px;
  box-shadow:var(--shadow);
  transition:var(--transition);
  border-top:4px solid var(--blue);
}
.feature-item:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lg);
}
.feature-item h3{
  color:var(--navy);
  font-size:1.05rem;
  margin:0 0 10px;
}
.feature-item p{
  font-size:.9rem;
  color:var(--text-light);
  line-height:1.8;
}

/* --- Info Box --- */
.info-box{
  background:linear-gradient(135deg,rgba(0,86,179,.04),transparent);
  border-left:5px solid var(--blue);
  border-radius:0 var(--radius) var(--radius) 0;
  padding:20px 24px;
  margin:20px 0;
}
.info-box.accent{
  border-left-color:var(--accent);
  background:linear-gradient(135deg,rgba(255,87,51,.04),transparent);
}

/* --- Tables --- */
table{
  width:100%;
  border-collapse:separate;
  border-spacing:0;
  margin:20px 0;
  font-size:.9rem;
  background:var(--white);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:0 1px 8px rgba(0,0,0,.05);
  border:1px solid var(--gray-200);
}
table th{
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:var(--white);
  padding:12px 16px;
  font-weight:600;
  text-align:center;
  font-size:.85rem;
}
table td{
  padding:11px 14px;
  border-bottom:1px solid var(--gray-100);
  text-align:left;
  vertical-align:middle;
}
table tr:last-child td{border-bottom:none}
table tr:nth-child(even) td{background:var(--gray-50)}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section{
  background:linear-gradient(135deg,var(--navy) 0%,var(--blue) 60%,var(--blue-light) 100%);
  color:var(--white);
  padding:60px 0;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.cta-section::before{
  content:'';position:absolute;
  top:-100px;right:-80px;
  width:300px;height:300px;
  background:radial-gradient(circle,rgba(255,120,73,.12),transparent 70%);
  border-radius:50%;
}
.cta-section h2{
  font-size:1.6rem;font-weight:900;
  margin:0 0 12px;position:relative;
}
.cta-section p{
  font-size:.95rem;opacity:.85;
  margin:0 0 28px;position:relative;
}
.cta-buttons{
  display:flex;justify-content:center;
  gap:16px;flex-wrap:wrap;position:relative;
}
.cta-info{margin-top:24px;font-size:.82rem;opacity:.6}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{
  background:var(--gray-800);
  color:rgba(255,255,255,.7);
  padding:48px 0 24px;
  font-size:.85rem;line-height:1.8;
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:40px;margin-bottom:32px;
}
.footer-logo{
  color:var(--white);font-size:1.15rem;
  font-weight:900;margin:0 0 12px;
}
.footer-brand p{margin:4px 0}
.footer-brand a{color:rgba(255,255,255,.8)}
.footer-brand a:hover{color:var(--white)}
.footer-nav h4{
  color:var(--white);font-size:.9rem;
  margin:0 0 12px;font-weight:700;
}
.footer-nav ul{list-style:none;padding:0;margin:0;columns:2;gap:8px}
.footer-nav ul li{margin:0 0 6px}
.footer-nav ul li a{color:rgba(255,255,255,.6);font-size:.82rem;transition:var(--transition)}
.footer-nav ul li a:hover{color:var(--white)}
.footer-copy{
  text-align:center;padding-top:24px;
  border-top:1px solid rgba(255,255,255,.1);
  font-size:.78rem;opacity:.5;
}

/* ============================================================
   STICKY CTA (モバイル)
   ============================================================ */
.sticky-cta{
  display:none;
  position:fixed;bottom:0;left:0;right:0;
  z-index:200;
  background:var(--white);
  box-shadow:0 -4px 20px rgba(0,0,0,.1);
  padding:10px 16px;gap:10px;
}
.sticky-cta a{
  flex:1;display:flex;
  align-items:center;justify-content:center;
  gap:6px;padding:12px 8px;
  border-radius:var(--radius-sm);
  font-size:.85rem;font-weight:700;
  text-decoration:none;text-align:center;
}
.sticky-cta .s-tel{
  background:linear-gradient(135deg,var(--accent),#ff7849);
  color:var(--white);
}
.sticky-cta .s-mail{
  background:var(--navy);
  color:var(--white);
}

/* ============================================================
   UTILITY
   ============================================================ */
.text-center{text-align:center}
.text-accent{color:var(--accent)}
.text-blue{color:var(--blue)}
.text-navy{color:var(--navy)}
.text-small{font-size:.85rem;color:var(--gray-600)}
.mt-0{margin-top:0}.mt-2{margin-top:16px}.mt-4{margin-top:32px}
.mb-0{margin-bottom:0}.mb-2{margin-bottom:16px}.mb-4{margin-bottom:32px}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:768px){
  .header-tel{display:none}
  .header-brand h3{font-size:1rem}
  .nav-list li a{padding:10px 12px;font-size:.75rem}
  .page-hero{padding:40px 0 36px}
  .page-hero h1{font-size:1.5rem}
  .content-section{padding:36px 0}
  .content-card{padding:24px 18px}
  .feature-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .cta-section{padding:40px 0}
  .cta-section h2{font-size:1.3rem}
  .cta-buttons{flex-direction:column;align-items:center}
  .sticky-cta{display:flex}
  body{padding-bottom:70px}
}
@media(max-width:480px){
  .container{padding:0 16px}
  .content-card{padding:20px 14px;border-radius:var(--radius-sm)}
  body{font-size:15px}
}