/* ============================================
   shima会計 公式サイト 共通スタイル
   配色: 薄緑(#a8d5b9 / #c8e6c9) + 薄黄(#fff9c4) + 白
   ============================================ */

:root {
    --color-green-deep: #4a8c5e;
    --color-green: #7cb992;
    --color-green-light: #c8e6c9;
    --color-green-pale: #e8f5e9;
    --color-yellow: #fff59d;
    --color-yellow-pale: #fffbe5;
    --color-text: #333;
    --color-text-light: #666;
    --color-border: #e0e0e0;
    --color-white: #ffffff;
    --color-bg: #fafdfa;

    --font-base: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Yu Gothic', 'Meiryo', sans-serif;
    --font-mincho: 'Hiragino Mincho ProN', 'Yu Mincho', serif;

    --max-width: 1100px;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    color: var(--color-text);
    line-height: 1.7;
    background-color: var(--color-bg);
    font-size: 16px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-green-deep);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.7;
}

/* ============================================
   ヘッダー(1段構成)
   ============================================ */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.site-header__top {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    gap: 18px;
    position: relative;
}

.site-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-green-deep);
    letter-spacing: 0.04em;
    line-height: 1.1;
    flex-shrink: 0;
}

.site-logo small {
    display: block;
    font-size: 10px;
    font-weight: 400;
    color: var(--color-text-light);
    letter-spacing: 0.1em;
    margin-top: 3px;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    flex-wrap: nowrap;
    flex-grow: 1;
}

.site-nav a {
    padding: 8px 10px;
    color: var(--color-text);
    font-size: 13px;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    border-radius: 0;
}

.site-nav a:hover {
    background: var(--color-green-pale);
    opacity: 1;
}

.site-nav a.is-active {
    color: var(--color-green-deep);
    font-weight: 600;
    border-bottom-color: var(--color-green-deep);
}

.site-header__cta {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.header-tel-block {
    text-align: right;
    line-height: 1.2;
}

.header-tel {
    font-weight: 700;
    color: var(--color-green-deep);
    font-size: 16px;
    letter-spacing: 0.02em;
}

.header-tel-sub {
    font-size: 10px;
    color: var(--color-text-light);
    margin-top: 2px;
}

/* ハンバーガー */
.nav-toggle {
    display: none;
    border: none;
    background: transparent;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-green-deep);
    padding: 4px 8px;
}

/* 1280px未満ではハンバーガーに切り替え(全要素を1段で詰めるため余裕を持って早めに切替) */
@media (max-width: 1100px) {
    .site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background: var(--color-white);
        border-top: 1px solid var(--color-green-pale);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.25s ease;
        flex-grow: 0;
    }
    .site-nav.is-open {
        max-height: 600px;
    }
    .site-nav a {
        padding: 14px 20px;
        border-bottom: 1px solid var(--color-green-pale);
    }
    .site-nav a.is-active {
        border-bottom-color: var(--color-green-pale);
        background: var(--color-green-pale);
    }
    .nav-toggle { display: block; }
}

@media (max-width: 700px) {
    .site-header__top { padding: 10px 14px; gap: 10px; }
    .site-logo { font-size: 17px; }
    .site-logo small { font-size: 9px; }
    .header-tel { font-size: 14px; }
    .header-tel-sub { font-size: 9px; }
}

@media (max-width: 480px) {
    .header-tel-block { display: none; }
}

/* ============================================
   ボタン
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    text-align: center;
    line-height: 1.4;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-green) 0%, var(--color-green-deep) 100%);
    color: var(--color-white);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(74, 140, 94, 0.3);
    opacity: 1;
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-green-deep);
    border: 2px solid var(--color-green);
}

.btn-secondary:hover {
    background: var(--color-green-pale);
    transform: translateY(-2px);
    opacity: 1;
}

.btn-tel {
    background: var(--color-yellow);
    color: var(--color-text);
    border: 2px solid var(--color-yellow);
}

.btn-tel:hover {
    background: var(--color-yellow-pale);
    opacity: 1;
}

.btn-large {
    padding: 18px 40px;
    font-size: 17px;
}

/* ============================================
   セクション共通
   ============================================ */
.section {
    padding: 80px 20px;
}

.section--green {
    background: var(--color-green-pale);
}

.section--yellow {
    background: var(--color-yellow-pale);
}

.section__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-heading {
    text-align: center;
    margin-bottom: 50px;
}

.section-heading__sub {
    display: inline-block;
    font-size: 13px;
    color: var(--color-green-deep);
    letter-spacing: 0.15em;
    margin-bottom: 8px;
    font-weight: 600;
}

.section-heading h2 {
    font-size: 30px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.4;
}

.section-heading h2 em {
    font-style: normal;
    color: var(--color-green-deep);
    background: linear-gradient(transparent 65%, var(--color-yellow) 65%);
    padding: 0 4px;
}

.section-heading p {
    margin-top: 16px;
    color: var(--color-text-light);
    font-size: 15px;
}

@media (max-width: 700px) {
    .section { padding: 60px 16px; }
    .section-heading h2 { font-size: 22px; }
}

/* ============================================
   ページタイトル(下層ページ用)
   ============================================ */
.page-title {
    background: linear-gradient(135deg, var(--color-green-pale) 0%, var(--color-yellow-pale) 100%);
    padding: 60px 20px 50px;
    text-align: center;
}

.page-title h1 {
    font-size: 32px;
    color: var(--color-text);
    margin-bottom: 8px;
}

.page-title__sub {
    color: var(--color-green-deep);
    font-size: 13px;
    letter-spacing: 0.15em;
    font-weight: 600;
}

@media (max-width: 700px) {
    .page-title h1 { font-size: 24px; }
}

/* ============================================
   フッター
   ============================================ */
.site-footer {
    background: var(--color-text);
    color: #ddd;
    padding: 50px 20px 24px;
}

.site-footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 40px;
}

.site-footer h3 {
    color: var(--color-white);
    font-size: 15px;
    margin-bottom: 14px;
    border-left: 3px solid var(--color-green);
    padding-left: 10px;
}

.site-footer p,
.site-footer li {
    font-size: 13px;
    line-height: 1.9;
}

.site-footer ul {
    list-style: none;
}

.site-footer a {
    color: #ddd;
}

.site-footer a:hover {
    color: var(--color-green-light);
    opacity: 1;
}

.site-footer__copyright {
    text-align: center;
    margin-top: 36px;
    padding-top: 18px;
    border-top: 1px solid #555;
    font-size: 12px;
    color: #aaa;
}

@media (max-width: 700px) {
    .site-footer__inner { grid-template-columns: 1fr; gap: 28px; }
}

/* ============================================
   フローティングCTA(モバイル用)
   ============================================ */
.fixed-cta {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
    padding: 10px 12px;
    z-index: 90;
    gap: 8px;
}

.fixed-cta .btn {
    flex: 1;
    padding: 12px 8px;
    font-size: 13px;
}

@media (max-width: 700px) {
    .fixed-cta { display: flex; }
    body { padding-bottom: 80px; }
}