/* ==========================================
   Material Design 3 Tonal Palette System & Global
   ========================================== */
:root {
    /* M3 Color tokens (Light scheme baseline) */
    --md-sys-color-primary: #005faf;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #d1e4ff;
    --md-sys-color-on-primary-container: #001d36;
    
    --md-sys-color-secondary: #535f70;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-secondary-container: #d7e3f7;
    --md-sys-color-on-secondary-container: #101c2b;
    
    --md-sys-color-tertiary: #6b5778;
    --md-sys-color-on-tertiary: #ffffff;
    --md-sys-color-tertiary-container: #f2daff;
    --md-sys-color-on-tertiary-container: #251431;

    --md-sys-color-background: #fdfcff;
    --md-sys-color-on-background: #1a1c1e;
    --md-sys-color-surface: #fdfcff;
    --md-sys-color-on-surface: #1a1c1e;
    --md-sys-color-surface-variant: #f0f4f8;
    --md-sys-color-on-surface-variant: #43474e;
    --md-sys-color-outline: #73777f;

    /* Shape & Elevation tokens */
    --md-shape-corner-small: 8px;
    --md-shape-corner-medium: 12px;
    --md-shape-corner-large: 16px;
    --md-shape-corner-full: 9999px;
    
    --md-elevation-1: 0px 1px 3px 1px rgba(0, 0, 0, 0.15), 0px 1px 2px 0px rgba(0, 0, 0, 0.30);
    --md-elevation-2: 0px 2px 6px 2px rgba(0, 0, 0, 0.15), 0px 1px 2px 0px rgba(0, 0, 0, 0.30);
}

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

body {
    font-family: 'Noto Sans JP', 'Roboto', sans-serif;
    background-color: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================
   App Bar (Header)
   ========================================== */
.app-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(253, 252, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--md-sys-color-surface-variant);
    height: 64px;
}

.app-bar-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.app-bar-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--md-sys-color-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links a {
    text-decoration: none;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--md-sys-color-primary);
}

/* ==========================================
   Buttons (M3 style)
   ========================================== */
.btn-filled, .btn-outlined {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
    cursor: pointer;
}

.btn-filled {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    border-radius: var(--md-shape-corner-full);
}

.btn-filled:hover {
    background-color: #004d8f;
    box-shadow: var(--md-elevation-1);
}

.btn-outlined {
    background-color: transparent;
    color: var(--md-sys-color-primary);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-shape-corner-full);
}

.btn-outlined:hover {
    background-color: rgba(0, 95, 175, 0.08);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 1rem;
}

/* ==========================================
   Main Content Sections
   ========================================== */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-container {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: 48px;
    color: var(--md-sys-color-on-background);
}

.bg-surface-variant {
    background-color: var(--md-sys-color-surface-variant);
    margin-left: -50vw;
    margin-right: -50vw;
    padding-left: 50vw;
    padding-right: 50vw;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero-section {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
    padding: 80px 0;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.badge {
    background-color: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    padding: 6px 12px;
    border-radius: var(--md-shape-corner-small);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.hero-title {
    font-size: 2.8rem;
    line-height: 1.25;
    font-weight: 500;
    color: var(--md-sys-color-on-background);
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Hero Mockup Visual */
.hero-visual {
    display: flex;
    justify-content: center;
}

.visual-card {
    background-color: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-surface-variant);
    border-radius: var(--md-shape-corner-large);
    box-shadow: var(--md-elevation-2);
    padding: 32px;
    width: 100%;
    max-width: 380px;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.card-header h3 {
    font-size: 1.15rem;
    font-weight: 500;
}

.card-body p {
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 24px;
}

.visual-badge-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.v-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface-variant);
    padding: 8px 12px;
    border-radius: var(--md-shape-corner-small);
    font-size: 0.85rem;
}

.text-primary { color: var(--md-sys-color-primary); }

/* ==========================================
   Features Cards Grid (M3 Card style)
   ========================================== */
.grid-3col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.m3-card {
    background-color: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-surface-variant);
    border-radius: var(--md-shape-corner-large);
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.m3-card:hover {
    box-shadow: var(--md-elevation-1);
    transform: translateY(-2px);
}

.m3-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--md-shape-corner-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.m3-card-title {
    font-size: 1.15rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--md-sys-color-on-background);
}

.m3-card-text {
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface-variant);
}

/* Background Color Helpers for M3 icons */
.bg-primary-container { background-color: var(--md-sys-color-primary-container); }
.text-on-primary-container { color: var(--md-sys-color-on-primary-container); }
.bg-secondary-container { background-color: var(--md-sys-color-secondary-container); }
.text-on-secondary-container { color: var(--md-sys-color-on-secondary-container); }
.bg-tertiary-container { background-color: var(--md-sys-color-tertiary-container); }
.text-on-tertiary-container { color: var(--md-sys-color-on-tertiary-container); }

/* ==========================================
   Timeline / Step Flow
   ========================================== */
.flow-timeline {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.flow-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.step-number {
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    width: 36px;
    height: 36px;
    border-radius: var(--md-shape-corner-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 6px;
}

.step-content p {
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface-variant);
}

/* ==========================================
   Security Box
   ========================================== */
.security-info-box {
    background-color: var(--md-sys-color-surface-variant);
    border-radius: var(--md-shape-corner-large);
    padding: 32px;
    display: flex;
    gap: 24px;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
}

.security-icon {
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    width: 64px;
    height: 64px;
    border-radius: var(--md-shape-corner-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.security-icon .material-icons-outlined {
    font-size: 32px;
}

.security-text h2 {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.security-text p {
    font-size: 0.9rem;
    color: var(--md-sys-color-on-surface-variant);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background-color: var(--md-sys-color-surface-variant);
    padding: 48px 24px;
    text-align: center;
    border-top: 1px solid var(--md-sys-color-outline);
    font-size: 0.85rem;
    color: var(--md-sys-color-on-surface-variant);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer a {
    color: var(--md-sys-color-primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.license-info {
    margin-top: 24px;
    line-height: 1.8;
}

/* ==========================================
   Responsive adjustments
   ========================================== */
@media (max-width: 960px) {
    .hero-section {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 40px 0;
    }
    
    .hero-content {
        align-items: center;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-actions {
        justify-content: center;
    }

    .grid-3col {
        grid-template-columns: 1fr;
    }

    .security-info-box {
        flex-direction: column;
        text-align: center;
    }
}