/* =====================
基本設定
===================== */

:root{
  --main-color:#7b4f2a;
  --main-dark:#5b3a1e;
  --accent:#c00;
  --bg:#f5f5f5;
  --text:#333;
  --radius:10px;
  --shadow:0 5px 15px rgba(0,0,0,0.08);
  --shadow-hover:0 15px 30px rgba(0,0,0,0.15);
}

html{
  scroll-behavior:smooth;
}

body{
  font-family:"Noto Sans JP", sans-serif;
  line-height:1.7;
  color:var(--text);
  background:var(--bg);
  margin:0;
}

img{
  max-width:100%;
  height:auto;
  vertical-align:bottom;
}

a{
  color:inherit;
}

button{
  font:inherit;
}

/* =====================
コンテナ
===================== */

.container{
  width:90%;
  max-width:1200px;
  margin:auto;
}

/* =====================
ヘッダー
===================== */

header{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  background:rgba(255,255,255,0.92);
  box-shadow:0 2px 8px rgba(0,0,0,0.08);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  z-index:1000;
}

header .container{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:15px 0;
}

.logo{
  position:relative;
  z-index:1202;
}

.logo img{
  height:50px;
  display:block;
}

/* =====================
ナビ（PC）
===================== */

nav ul{
  display:flex;
  list-style:none;
  padding:0;
  margin:0;
}

nav li{
  margin-left:30px;
}

nav a{
  text-decoration:none;
  color:var(--text);
  font-weight:600;
  position:relative;
  display:inline-block;
  transition:0.3s;
}

/* アンダーライン */

nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-5px;
  width:100%;
  height:2px;
  background:var(--main-color);
  transform:scaleX(0);
  transform-origin:left;
  transition:0.3s;
}

nav a:hover{
  color:var(--main-color);
}

nav a:hover::after{
  transform:scaleX(1);
}

/* =====================
メイン
===================== */

main{
  margin-top:100px;
}

/* =====================
セクション共通
===================== */

section{
  width:90%;
  max-width:1100px;
  margin:100px auto;
}

.section-title{
  text-align:center;
  font-size:28px;
  margin-bottom:50px;
}

.section-title::after{
  content:"";
  display:block;
  width:60px;
  height:3px;
  background:var(--main-color);
  margin:10px auto;
}

/* =====================
共通ボタン
===================== */

.btn{
  display:inline-block;
  padding:12px 25px;
  border-radius:30px;
  font-weight:600;
  text-decoration:none;
  transition:0.3s;
}

.btn-main{
  background:var(--accent);
  color:#fff;
}

.btn-main:hover{
  background:#a00;
  transform:translateY(-2px);
}

.btn-sub{
  background:#fff;
  color:var(--main-color);
  border:2px solid var(--main-color);
}

.btn-sub:hover{
  background:var(--main-color);
  color:#fff;
  transform:translateY(-2px);
}

/* =====================
カード共通
===================== */

.card{
  background:#fff;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:0.3s;
}

.card:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-hover);
}

/* =====================
施工事例カード
===================== */

.works-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:30px;
}

.works-card{
  background:#fff;
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow);
  transition:0.3s;
}

.works-card:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-hover);
}

.works-card img{
  width:100%;
  display:block;
  transition:0.5s;
}

.works-card p{
  padding:15px;
  font-weight:600;
  text-align:center;
}

.works-card:hover img{
  transform:scale(1.05);
}

/* =====================
フッター
===================== */

.footer{
  background:var(--main-dark);
  color:#fff;
  padding:60px 0 30px;
  margin-top:100px;
}

.footer-inner{
  width:90%;
  max-width:1200px;
  margin:auto;
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:40px;
  margin-bottom:40px;
}

.footer-box h3{
  margin-bottom:15px;
  font-size:16px;
  border-bottom:1px solid rgba(255,255,255,0.3);
  padding-bottom:5px;
}

.footer-box ul{
  list-style:none;
  margin:0;
  padding:0;
}

.footer-box li{
  margin-bottom:10px;
}

.footer-box a{
  color:#fff;
  font-size:14px;
  text-decoration:none;
  position:relative;
}

.footer-box a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-3px;
  width:100%;
  height:2px;
  background:#fff;
  transform:scaleX(0);
  transform-origin:left;
  transition:0.3s;
}

.footer-box a:hover::after{
  transform:scaleX(1);
}

.footer-company{
  margin-top:20px;
  font-size:14px;
  line-height:1.8;
}

.footer-company h3{
  margin-bottom:10px;
}

.copyright{
  text-align:center;
  font-size:12px;
  margin-top:30px;
  opacity:0.8;
}

/* ======================
アニメーション
====================== */

.fade{
  opacity:0;
  transform:translateY(40px);
  transition:1s;
}

.fade.show{
  opacity:1;
  transform:translateY(0);
}

/* ======================
TOPへ戻る
====================== */

#page-top{
  position:fixed;
  right:30px;
  bottom:30px;
  width:55px;
  height:55px;
  background:var(--main-color);
  border:none;
  border-radius:50%;
  opacity:0;
  transition:0.3s;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  z-index:999;
}

#page-top.show{
  opacity:1;
}

#page-top span{
  display:block;
  width:12px;
  height:12px;
  border-top:3px solid #fff;
  border-left:3px solid #fff;
  transform:rotate(45deg);
  margin-top:6px;
}

/* =====================
トピックス
===================== */

.topics{
  background:#fff;
  padding:60px 0;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.topics .container{
  width:90%;
  max-width:1100px;
  margin:auto;
}

.topics-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:25px;
}

.topics-header .section-title{
  margin-bottom:0;
  text-align:left;
}

.topics-link{
  font-size:14px;
  color:#666;
  text-decoration:none;
  transition:0.3s;
}

.topics-link:hover{
  color:var(--main-color);
}

.topics-list{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid #ddd;
}

.topics-list li{
  display:flex;
  align-items:center;
  gap:15px;
  padding:15px 0;
  border-bottom:1px solid #eee;
  flex-wrap:wrap;
}

.topics-list .date{
  font-size:13px;
  color:#888;
  min-width:90px;
}

.topics-list a{
  text-decoration:none;
  color:var(--text);
  transition:0.3s;
}

.topics-list a:hover{
  color:var(--main-color);
}

.label{
  font-size:11px;
  padding:2px 6px;
  border-radius:3px;
  color:#fff;
}

.label.new{
  background:var(--accent);
}

/* =====================
強み（feature）
===================== */

.feature{
  text-align:center;
}

.feature-grid{
  display:flex;
  gap:30px;
  margin-top:40px;
}

.feature-box{
  flex:1;
  padding:30px;
  background:#fff;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:0.3s;
}

.feature-box:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-hover);
}

.feature-box h3{
  color:var(--main-color);
  margin-bottom:10px;
  font-size:20px;
}

/* =====================
ページタイトル
===================== */

.page-title{
  text-align:center;
  padding:60px 20px 30px;
}

.page-title h1{
  font-size:32px;
  margin-bottom:10px;
}

.page-title h1::after{
  content:"";
  display:block;
  width:60px;
  height:3px;
  background:var(--main-color);
  margin:10px auto;
}

.page-title p{
  color:#666;
}

/* ======================
ハンバーガーメニュー
====================== */

.hamburger{
  display:none;
  width:30px;
  height:22px;
  position:relative;
  cursor:pointer;
  z-index:1201;
}

.hamburger span{
  position:absolute;
  left:0;
  width:100%;
  height:3px;
  background:var(--text);
  transition:0.3s;
  border-radius:10px;
}

.hamburger span:nth-child(1){
  top:0;
}

.hamburger span:nth-child(2){
  top:9px;
}

.hamburger span:nth-child(3){
  bottom:0;
}

.hamburger.active span:nth-child(1){
  transform:rotate(45deg);
  top:9px;
}

.hamburger.active span:nth-child(2){
  opacity:0;
}

.hamburger.active span:nth-child(3){
  transform:rotate(-45deg);
  top:9px;
  bottom:auto;
}

/* =====================
レスポンシブ
===================== */

@media screen and (max-width:768px){

  main{
    margin-top:90px;
  }

  section{
    width:92%;
    margin:70px auto;
  }

  .section-title{
    font-size:24px;
    margin-bottom:35px;
  }

  .works-grid{
    grid-template-columns:none;
  }

  .footer-grid{
    grid-template-columns:repeat(2,1fr);
    gap:25px;
  }

  .feature-grid{
    flex-direction:column;
  }

  .topics-header{
    flex-direction:column;
    align-items:flex-start;
    gap:10px;
  }

  .topics-list li{
    flex-direction:column;
    align-items:flex-start;
    gap:5px;
  }

  /* ハンバーガーボタン */
  .hamburger{
    display:flex;
    align-items:center;
    justify-content:center;
    width:46px;
    height:46px;
    position:relative;
    cursor:pointer;
    z-index:1201;
    border-radius:50%;
    background:rgba(255,255,255,0.92);
    box-shadow:0 6px 18px rgba(0,0,0,0.10);
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
    transition:0.3s;
  }

  .hamburger:hover{
    transform:translateY(-1px);
    box-shadow:0 10px 24px rgba(0,0,0,0.14);
  }

  .hamburger span{
    position:absolute;
    left:11px;
    width:24px;
    height:2px;
    background:var(--main-dark);
    border-radius:10px;
    transition:0.35s ease;
  }

  .hamburger span:nth-child(1){
    top:14px;
  }

  .hamburger span:nth-child(2){
    top:22px;
  }

  .hamburger span:nth-child(3){
    top:30px;
    bottom:auto;
  }

  .hamburger.active{
    background:#fff;
  }

  .hamburger.active span:nth-child(1){
    transform:rotate(45deg);
    top:22px;
  }

  .hamburger.active span:nth-child(2){
    opacity:0;
    transform:scaleX(0);
  }

  .hamburger.active span:nth-child(3){
    transform:rotate(-45deg);
    top:22px;
  }

  /* スマホナビ */
  nav{
    position:fixed;
    top:0;
    right:-100%;
    width:86%;
    max-width:360px;
    height:100vh;
    padding:90px 24px 32px;
    background:linear-gradient(180deg, rgba(255,255,255,0.96) 0%, rgba(249,246,242,0.98) 100%);
    box-shadow:-12px 0 30px rgba(0,0,0,0.14);
    z-index:1200;
    overflow-y:auto;
    transition:right 0.4s ease;
    border-left:1px solid rgba(123,79,42,0.10);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
  }

  nav.active{
    right:0;
  }

  nav::before{
    content:"";
    position:fixed;
    inset:0;
    background:
      linear-gradient(
        180deg,
        rgba(255,255,255,0.55) 0%,
        rgba(123,79,42,0.10) 100%
      );
    backdrop-filter:blur(4px);
    -webkit-backdrop-filter:blur(4px);
    opacity:0;
    pointer-events:none;
    transition:0.35s ease;
    z-index:-1;
  }

  nav.active::before{
    opacity:1;
    pointer-events:auto;
  }

  nav ul{
    display:flex;
    flex-direction:column;
    gap:14px;
    padding:0;
    margin:0;
    list-style:none;
  }

  nav li{
    margin-left:0;
  }

  nav a{
    display:flex;
    align-items:center;
    justify-content:space-between;
    font-size:16px;
    font-weight:700;
    letter-spacing:0.04em;
    color:var(--main-dark);
    text-decoration:none;
    background:rgba(255,255,255,0.72);
    border:1px solid rgba(123,79,42,0.12);
    border-radius:14px;
    padding:15px 18px;
    box-shadow:0 4px 14px rgba(0,0,0,0.04);
    transition:0.3s ease;
    position:relative;
    overflow:hidden;
  }

  nav a::after{
    content:"";
    position:absolute;
    left:18px;
    right:18px;
    bottom:10px;
    width:auto;
    height:2px;
    background:linear-gradient(90deg, var(--main-color), rgba(123,79,42,0.15));
    transform:scaleX(0);
    transform-origin:left;
    transition:0.3s ease;
  }

  nav a::before{
    content:"›";
    font-size:18px;
    font-weight:700;
    color:var(--main-color);
    margin-left:12px;
    transition:0.3s ease;
    order:2;
  }

  nav a:hover{
    background:#fff;
    color:var(--main-color);
    transform:translateX(4px);
    box-shadow:0 10px 22px rgba(0,0,0,0.08);
  }

  nav a:hover::after{
    transform:scaleX(1);
  }

  nav a:hover::before{
    transform:translateX(3px);
  }

  nav ul::before{
    content:"MENU";
    display:block;
    margin-bottom:10px;
    font-size:12px;
    font-weight:700;
    letter-spacing:0.18em;
    color:rgba(91,58,30,0.55);
  }

  #page-top{
    right:20px;
    bottom:20px;
    width:50px;
    height:50px;
  }
}

@media screen and (max-width:480px){

  header .container{
    padding:12px 0;
  }

  .logo img{
    height:44px;
  }

  .footer-grid{
    grid-template-columns:1fr;
  }

  .page-title h1{
    font-size:28px;
  }

  .feature-box{
    padding:24px 20px;
  }

  .hamburger{
    width:42px;
    height:42px;
  }

  .hamburger span{
    left:10px;
    width:22px;
  }

  .hamburger span:nth-child(1){
    top:13px;
  }

  .hamburger span:nth-child(2){
    top:20px;
  }

  .hamburger span:nth-child(3){
    top:27px;
  }

  .hamburger.active span:nth-child(1),
  .hamburger.active span:nth-child(3){
    top:20px;
  }

  nav{
    width:88%;
    padding:82px 18px 24px;
  }

  nav ul{
    gap:12px;
  }

  nav a{
    font-size:15px;
    padding:14px 16px;
    border-radius:12px;
  }
}

/* =========================
   お問い合わせモーダル
========================= */

.contact-open-btn{
  background:none;
  border:none;
  font:inherit;
  cursor:pointer;
  color:#333;
  padding:0;
  position:relative;
}

.contact-open-btn::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-5px;
  width:100%;
  height:2px;
  background:#7b4f2a;
  transform:scaleX(0);
  transform-origin:left;
  transition:0.3s;
}

.contact-open-btn:hover::after{
  transform:scaleX(1);
}

.contact-modal{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,0.6);
  display:flex;
  justify-content:center;
  align-items:center;
  z-index:9999;

  opacity:0;
  visibility:hidden;
  transition:0.3s;
}

.contact-modal.active{
  opacity:1;
  visibility:visible;
}

.contact-modal-content{
  width:90%;
  max-width:500px;
  background:#fff;
  border-radius:20px;
  padding:40px 30px;
  position:relative;
  box-shadow:0 20px 40px rgba(0,0,0,0.2);
}

.contact-modal-content h2{
  text-align:center;
  margin-bottom:30px;
  font-size:24px;
  color:#7b4f2a;
}

.contact-close-btn{
  position:absolute;
  top:15px;
  right:15px;
  width:40px;
  height:40px;
  border:none;
  border-radius:50%;
  background:#f2f2f2;
  cursor:pointer;
  font-size:22px;
}

.contact-links{
  display:flex;
  flex-direction:column;
  gap:15px;
}

.contact-card{
  display:flex;
  align-items:center;
  gap:18px;
  padding:18px;
  border-radius:14px;
  background:#f8f8f8;
  text-decoration:none;
  color:#333;
  transition:0.3s;
}

.contact-card:hover{
  background:#7b4f2a;
  color:#fff;
  transform:translateY(-3px);
}

.contact-card .icon{
  font-size:28px;
}

.contact-card strong{
  display:block;
  font-size:18px;
  margin-bottom:5px;
}

.contact-card p{
  font-size:14px;
}