:root {
    /* Color Palette - Green/Natural */
    --color-primary: #4CAF50;
    /* Main Green */
    --color-primary-dark: #388E3C;
    /* Darker Green for hover */
    --color-primary-light: #E8F5E9;
    /* Light Green for backgrounds */
    --color-accent: #FF9800;
    /* Orange for CTA/Accent */
    --color-text: #333333;
    /* Dark Grey for text */
    --color-text-light: #666666;
    /* Light Grey for secondary text */
    --color-bg: #FFFFFF;
    /* White background */
    --color-bg-alt: #F9F9F9;
    /* Off-white background */
    --color-line: #06C755;
    /* LINE Brand Color */

    /* Spacing */
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* Container Width */
    --container-width: 1200px;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--color-text);
    line-height: 1.6;
    background-color: var(--color-bg);
    padding-top: 70px;
    /* ← 追加 */
}

a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.3s;
}

a:hover {
    opacity: 0.8;
}

ul {
    list-style: none;
}

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

/* Utilities */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
}

.section-description {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.text-highlight {
    color: var(--color-accent);
    font-weight: bold;
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: bold;
    text-align: center;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    filter: brightness(1.1);
}

.btn:active {
    transform: scale(0.98);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn--primary {
    background-color: var(--color-accent);
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn--primary:hover {
    background-color: #F57C00;
}

.btn--line {
    background-color: var(--color-line);
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn--line:hover {
    background-color: #05b34c;
}

.btn--lg {
    padding: 15px 40px;
    font-size: 1.1rem;
    width: 100%;
    max-width: 300px;
}

.btn--block {
    display: block;
    width: 100%;
}

/* Header */
.header {
    background-color: var(--color-line);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    height: 70px;
    display: flex;
    align-items: center;
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
}

.nav {
    display: none;
    /* Hidden on mobile */
}

.mobile-menu-btn {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 24px;
    position: relative;
    z-index: 1001;
}

.mobile-menu-btn__line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: white;
    position: absolute;
    transition: 0.3s;
}

.mobile-menu-btn__line:nth-child(1) {
    top: 0;
}

.mobile-menu-btn__line:nth-child(2) {
    top: 50%;
    transform: translateY(-50%);
}

.mobile-menu-btn__line:nth-child(3) {
    bottom: 0;
}

.mobile-menu-btn.active .mobile-menu-btn__line:nth-child(1) {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
}

.mobile-menu-btn.active .mobile-menu-btn__line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .mobile-menu-btn__line:nth-child(3) {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background-color: white;
    padding-top: 80px;
    transition: 0.3s;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 999;
    /* ← 追加 */
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu__list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.mobile-menu__link {
    font-size: 1.2rem;
    font-weight: bold;
}

/* Footer */
.footer {
    background-color: #333;
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer__logo {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: var(--spacing-md);
}

.footer__nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.copyright {
    font-size: 0.8rem;
    color: #999;
}

/* =======================================
   Fade-in Animation (ふわっと表示)
   ======================================= */
.fade-in-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s cubic-bezier(0.4, 0, 0.2, 1),
        transform 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-element.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 段階的な遅延表示 */
.fade-in-element:nth-child(1).is-visible {
    transition-delay: 0s;
}

.fade-in-element:nth-child(2).is-visible {
    transition-delay: 0.1s;
}

.fade-in-element:nth-child(3).is-visible {
    transition-delay: 0.2s;
}

.fade-in-element:nth-child(4).is-visible {
    transition-delay: 0.3s;
}

.fade-in-element:nth-child(5).is-visible {
    transition-delay: 0.4s;
}