/* ========== リセットと変数定義 ========== */
:root {
    /* カラーパレット - 研究所テーマ */
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #6366F1;
    --secondary-color: #1F2937;
    --accent-color: #10B981;
    --research-color: #06B6D4;
    --text-primary: #2D3436;
    --text-secondary: #636E72;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-tertiary: #E9ECEF;
    --border-color: #DEE2E6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --shadow-xl: 0 16px 64px rgba(0,0,0,0.20);
    
    /* アニメーション設定 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* レイアウト */
    --container-width: 1200px;
    --navbar-height: 80px;
    
    /* フォント */
    --font-primary: 'Inter', 'Noto Sans JP', sans-serif;
    --font-secondary: 'Noto Sans JP', sans-serif;
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #F8F9FA;
        --text-secondary: #ADB5BD;
        --bg-primary: #1A1A2E;
        --bg-secondary: #16213E;
        --bg-tertiary: #0F3460;
        --border-color: #2D3436;
    }
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== ローディング画面 ========== */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity var(--transition-slow);
}

#loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader {
    text-align: center;
}

.loader-circle {
    width: 60px;
    height: 60px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loader-text {
    color: var(--text-secondary);
    font-size: 14px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== ナビゲーション ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    height: 60px;
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.nav-brand:hover {
    transform: translateY(-2px);
}

.nav-logo {
    height: 40px;
    width: auto;
    transition: height var(--transition-normal);
}

.navbar.scrolled .nav-logo {
    height: 32px;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== ユーティリティクラス ========== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ========== ヒーローセクション ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--navbar-height) + 2rem) 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-particle {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

#particle1 {
    background: var(--primary-color);
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

#particle2 {
    background: var(--accent-color);
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

#particle3 {
    background: var(--secondary-color);
    bottom: 10%;
    left: 50%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(50px, -50px) scale(1.1);
    }
    50% {
        transform: translate(-50px, 50px) scale(0.9);
    }
    75% {
        transform: translate(30px, 30px) scale(1.05);
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.title-line {
    display: block;
    opacity: 0;
    transform: translateX(-30px);
    animation: slideInText 0.8s forwards;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

.title-line:nth-child(3) {
    animation-delay: 0.4s;
}

.title-line.highlight {
    background: linear-gradient(120deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes slideInText {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    animation: phoneFloat 4s ease-in-out infinite;
}

@keyframes phoneFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.phone-mockup img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.notification-bubble {
    position: absolute;
    top: 20%;
    right: -50px;
    background: white;
    border-radius: 20px;
    padding: 15px 20px;
    box-shadow: var(--shadow-lg);
    animation: bubblePop 0.6s ease-out 2s both;
}

@keyframes bubblePop {
    0% {
        transform: scale(0) rotate(-180deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.1) rotate(10deg);
    }
    100% {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

.bubble-character {
    width: 40px;
    height: 40px;
    margin-bottom: 8px;
    animation: characterBounce 2s ease-in-out infinite;
}

@keyframes characterBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.bubble-text {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 600;
}

/* ========== セクション共通スタイル ========== */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* ========== 特徴セクション ========== */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

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

.feature-card:hover::before {
    transform: translateX(0);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--bg-secondary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    background: var(--primary-color);
    transform: rotate(-10deg);
}

.feature-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--primary-color);
    transition: stroke var(--transition-normal);
}

.feature-card:hover .feature-icon svg {
    stroke: white;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========== スクリーンショットセクション ========== */
.screenshot-carousel {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.screenshot-container {
    overflow: hidden;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.screenshot-track {
    display: flex;
    transition: transform var(--transition-normal);
}

.screenshot-item {
    min-width: 100%;
    text-align: center;
}

.screenshot-item img {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 16px;
}

.screenshot-caption {
    margin-top: 1rem;
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.screenshot-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.screenshot-btn {
    width: 50px;
    height: 50px;
    border: 2px solid var(--primary-color);
    background: transparent;
    border-radius: 50%;
    color: var(--primary-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.screenshot-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

/* ========== 研究所についてセクション ========== */
.about {
    background: var(--bg-primary);
    padding: 6rem 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-top: 3rem;
}

.about-text h3 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.about-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.about-text ul {
    list-style: none;
    padding: 0;
}

.about-text li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 2rem;
}

.about-text li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.research-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.research-item {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.research-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.research-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* ========== プロジェクトセクション ========== */
.projects {
    background: var(--bg-secondary);
    padding: 6rem 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.project-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.project-card.featured .project-title,
.project-card.featured .project-description {
    color: white;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.project-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-secondary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.project-card.featured .project-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.project-meta {
    display: flex;
    gap: 0.5rem;
}

.project-status {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 600;
    text-transform: uppercase;
}

.project-status.active {
    background: var(--accent-color);
    color: white;
}

.project-status.planning {
    background: #F59E0B;
    color: white;
}

.project-status.research {
    background: var(--research-color);
    color: white;
}

.project-type {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    font-size: 0.875rem;
    padding: 0.25rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 20px;
    color: var(--text-secondary);
}

.project-card.featured .tech-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.project-actions {
    display: flex;
    gap: 1rem;
}

.btn-sm {
    padding: 0.5rem 1.5rem;
    font-size: 0.875rem;
}

.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* ========== LINE Notify Buddy詳細セクション ========== */
.line-notify-buddy {
    background: var(--bg-primary);
    padding: 6rem 0;
}

.app-features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin: 3rem 0;
}

.app-feature {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: all var(--transition-normal);
}

.app-feature:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.app-feature .feature-icon {
    width: 50px;
    height: 50px;
    min-width: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-feature h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.app-feature p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.app-screenshots {
    margin-top: 3rem;
}

/* ========== ダウンロードセクション ========== */
.download {
    background: var(--bg-secondary);
}

.download-box {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3rem;
    align-items: center;
}

.download-title {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.download-specs {
    list-style: none;
    color: var(--text-secondary);
}

.download-specs li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.download-specs li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.btn-download {
    background: var(--primary-color);
    color: white;
    font-size: 1.125rem;
    padding: 16px 32px;
    margin-bottom: 1rem;
}

.btn-download:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.download-security {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
}

.security-label {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.security-hash {
    display: block;
    font-family: monospace;
    background: var(--bg-tertiary);
    padding: 8px 12px;
    border-radius: 4px;
    word-break: break-all;
    margin-bottom: 0.5rem;
}

.btn-copy {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-copy:hover {
    background: var(--bg-tertiary);
}

.btn-copy svg {
    width: 16px;
    height: 16px;
}

.install-guide {
    margin-top: 3rem;
}

.install-guide h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.install-steps {
    counter-reset: step;
    list-style: none;
}

.install-steps li {
    counter-increment: step;
    padding: 1rem 0;
    padding-left: 3rem;
    position: relative;
    color: var(--text-secondary);
}

.install-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 1rem;
    width: 2rem;
    height: 2rem;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.install-note {
    background: #FFF3CD;
    border: 1px solid #FFC107;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

/* ========== お問い合わせセクション ========== */
.contact {
    background: var(--bg-primary);
    padding: 6rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    margin-top: 3rem;
}

.contact-info h3 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: all var(--transition-normal);
}

.contact-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 50px;
    height: 50px;
    min-width: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.contact-item p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* コンタクトフォーム */
.contact-form-container {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    height: 20px;
    width: 20px;
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 0.75rem;
    transition: all var(--transition-fast);
    position: relative;
}

.checkbox-label:hover input ~ .checkmark {
    border-color: var(--primary-color);
}

.checkbox-label input:checked ~ .checkmark {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-label input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-label a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 0.25rem;
}

.checkbox-label a:hover {
    text-decoration: underline;
}



/* ========== フッター ========== */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-logo {
    height: 50px;
    width: auto;
    filter: brightness(0) invert(1);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal {
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

/* ========== Cookie Banner ========== */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--secondary-color);
    color: white;
    padding: 1.5rem;
    transform: translateY(100%);
    transition: transform var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-xl);
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.cookie-actions {
    display: flex;
    gap: 1rem;
}

.btn-cookie-accept {
    background: var(--primary-color);
    color: white;
    padding: 8px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-cookie-accept:hover {
    background: var(--primary-dark);
}

.btn-cookie-learn {
    color: white;
    text-decoration: none;
    padding: 8px 20px;
    transition: opacity var(--transition-fast);
}

.btn-cookie-learn:hover {
    opacity: 0.8;
}

/* ========== モーダル ========== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 2000;
}

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

.modal-content {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    transform: scale(0.8);
    transition: transform var(--transition-normal);
    position: relative;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.modal-checklist {
    list-style: none;
    margin: 1.5rem 0;
}

.modal-checklist li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* ========== レスポンシブデザイン ========== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-image {
        order: -1;
        margin-bottom: 2rem;
    }
    
    .download-box {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
    
    .notification-bubble {
        right: -20px;
        transform: scale(0.8);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .privacy-grid {
        grid-template-columns: 1fr;
    }
    
    .cookie-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.75rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 1.5rem;
    }
}

/* ========== アニメーション追加定義 ========== */
[data-aos] {
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0) translateX(0);
}