:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --secondary: #F59E0B;
    --accent: #10B981;
    --dark: #1F2937;
    --gray: #6B7280;
    --light: #F9FAFB;
    --white: #FFFFFF;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Hiragino Sans', 'Yu Gothic Medium', 'Meiryo', 'Helvetica Neue', Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563EB 50%, #1e3a5f 100%);
    background-attachment: fixed;
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Header ===== */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo a { text-decoration: none; }

.logo h1 {
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

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

nav ul li { margin-left: 1.5rem; }

nav ul li a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 0.8rem;
    border-radius: 25px;
    font-size: 0.95rem;
}

nav ul li a:hover {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

/* ===== Language Selector ===== */
.lang-selector {
    position: relative;
}

.lang-selector select {
    appearance: none;
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 20px;
    padding: 0.4rem 2rem 0.4rem 0.8rem;
    font-size: 0.85rem;
    color: var(--dark);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-selector select:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.12);
}

.lang-selector::after {
    content: '▾';
    position: absolute;
    right: 0.7rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--gray);
    font-size: 0.8rem;
}

/* ===== Hero ===== */
.hero {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.95), rgba(16, 185, 129, 0.9));
    color: var(--white);
    padding: 10rem 5% 6rem;
    margin-top: 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="15" cy="25" r="2" fill="white" opacity="0.2"/><circle cx="85" cy="15" r="1.5" fill="white" opacity="0.3"/><circle cx="45" cy="75" r="1" fill="white" opacity="0.2"/><circle cx="75" cy="55" r="1.5" fill="white" opacity="0.3"/></svg>');
    animation: float 8s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1;
    animation: slideIn 1s ease-out;
}

.hero p {
    font-size: 1.3rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    animation: slideIn 1s ease-out 0.3s both;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Page Header (Privacy/Terms) ===== */
.page-header {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.95), rgba(16, 185, 129, 0.9));
    color: var(--white);
    padding: 8rem 5% 3rem;
    margin-top: 60px;
    text-align: center;
}

.page-header h2 {
    font-size: 2.5rem;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.page-header p {
    margin-top: 0.5rem;
    opacity: 0.9;
    font-size: 1rem;
}

/* ===== Sections ===== */
section { padding: 5rem 5%; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 25px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h3 {
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    font-weight: 700;
}

.section-title p {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(249,250,251,0.7));
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
}

.feature-content { padding: 1.5rem; }
.feature-content h4 { font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--dark); }
.feature-content p { color: var(--gray); font-size: 0.95rem; line-height: 1.7; }

/* ===== Safety Grid ===== */
.safety-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.safety-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(37, 99, 235, 0.05);
    border-radius: 12px;
}

.safety-item .icon { font-size: 1.5rem; flex-shrink: 0; }
.safety-item h5 { font-size: 1rem; margin-bottom: 0.3rem; color: var(--dark); }
.safety-item p { font-size: 0.9rem; color: var(--gray); }

/* ===== Content (Privacy/Terms) ===== */
.content { padding: 3rem 5%; }

.content-container {
    max-width: 900px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.97);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.content-container .section-block { margin-bottom: 2.5rem; }
.content-container .section-block:last-child { margin-bottom: 0; }

.content-container h3 {
    font-size: 1.4rem;
    color: var(--primary-dark);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(37, 99, 235, 0.15);
}

.content-container p {
    color: #374151;
    margin-bottom: 0.8rem;
    line-height: 1.8;
}

.content-container ul {
    margin: 0.5rem 0 1rem 1.5rem;
    color: #374151;
}

.content-container ul li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.content-container a { color: var(--primary); }

.content-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.content-container table th,
.content-container table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #E5E7EB;
}

.content-container table th {
    background: rgba(37, 99, 235, 0.05);
    font-weight: 600;
    color: var(--dark);
}

.content-container table td { color: #374151; }

/* ===== Footer ===== */
footer {
    background: linear-gradient(135deg, var(--dark), #111827);
    color: var(--white);
    padding: 3rem 5% 1rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2.5rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
    padding-bottom: 0.5rem;
    position: relative;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

.footer-column ul { list-style: none; }
.footer-column ul li { margin-bottom: 0.8rem; }
.footer-column ul li a {
    color: #9CA3AF;
    text-decoration: none;
    transition: all 0.3s ease;
}
.footer-column ul li a:hover { color: var(--primary); }

.footer-bottom {
    max-width: 1200px;
    margin: 2.5rem auto 0;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.85rem;
    color: #6B7280;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    nav ul { display: none; }
    .hero h2 { font-size: 2rem; }
    .hero { padding: 8rem 5% 5rem; }
    .page-header { padding: 7rem 5% 2.5rem; }
    .page-header h2 { font-size: 1.8rem; }
    .container { padding: 2rem; margin: 0 1rem; }
    .content-container { padding: 2rem; }
    .content { padding: 2rem 3%; }
    section { padding: 3rem 3%; }
}

@media (max-width: 480px) {
    .hero h2 { font-size: 1.6rem; }
    .section-title h3 { font-size: 1.8rem; }
    .container { padding: 1.5rem; }
    .content-container { padding: 1.5rem; }
    .content-container h3 { font-size: 1.2rem; }
}