/* ========================================
   証拠保全ロガー - Website Styles
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #007AFF;
    --color-primary-dark: #0056CC;
    --color-success: #34C759;
    --color-danger: #FF3B30;
    --color-warning: #FF9500;
    --color-purple: #AF52DE;
    --color-teal: #5AC8FA;

    /* Neutrals */
    --color-black: #000000;
    --color-gray-900: #1C1C1E;
    --color-gray-800: #2C2C2E;
    --color-gray-700: #3A3A3C;
    --color-gray-600: #48484A;
    --color-gray-500: #636366;
    --color-gray-400: #8E8E93;
    --color-gray-300: #AEAEB2;
    --color-gray-200: #C7C7CC;
    --color-gray-100: #E5E5EA;
    --color-gray-50: #F2F2F7;
    --color-white: #FFFFFF;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

ul {
    list-style: none;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-gray-100);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-gray-900);
    font-weight: 700;
}

.logo:hover {
    color: var(--color-gray-900);
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
}

.logo-text {
    font-size: var(--font-size-lg);
}

.nav-links {
    display: flex;
    gap: var(--spacing-8);
}

.nav-links a {
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .logo-text {
        font-size: var(--font-size-base);
    }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding-top: calc(64px + var(--spacing-20));
    padding-bottom: var(--spacing-20);
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-6);
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
}

.store-badge img {
    height: 48px;
    transition: transform var(--transition-fast);
}

.store-badge:hover img {
    transform: scale(1.05);
}

.hero-note {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.icon-shield {
    width: 18px;
    height: 18px;
    color: var(--color-success);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.mockup {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
}

@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

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

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

    .hero-image {
        order: -1;
    }

    .mockup {
        max-width: 300px;
    }
}

/* ========================================
   Section Styles
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    letter-spacing: -0.01em;
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-500);
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--spacing-24) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.feature-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--color-gray-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-5);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-icon.blue {
    background: rgba(0, 122, 255, 0.1);
    color: var(--color-primary);
}

.feature-icon.green {
    background: rgba(52, 199, 89, 0.1);
    color: var(--color-success);
}

.feature-icon.purple {
    background: rgba(175, 82, 222, 0.1);
    color: var(--color-purple);
}

.feature-icon.orange {
    background: rgba(255, 149, 0, 0.1);
    color: var(--color-warning);
}

.feature-icon.red {
    background: rgba(255, 59, 48, 0.1);
    color: var(--color-danger);
}

.feature-icon.teal {
    background: rgba(90, 200, 250, 0.1);
    color: var(--color-teal);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
}

.feature-description {
    color: var(--color-gray-500);
    line-height: 1.7;
}

@media (max-width: 968px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
    padding: var(--spacing-24) 0;
    background: var(--color-gray-50);
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-6);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 240px;
}

.step-number {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    color: var(--color-white);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-5);
}

.step-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.step-description {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

.step-arrow {
    color: var(--color-gray-300);
}

.step-arrow svg {
    width: 32px;
    height: 32px;
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }
}

/* ========================================
   Security Section
   ======================================== */
.security {
    padding: var(--spacing-24) 0;
}

.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
}

.security-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.8;
}

.security-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.security-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-base);
}

.security-list svg {
    width: 24px;
    height: 24px;
    color: var(--color-success);
    flex-shrink: 0;
}

.security-image img {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .security-content {
        grid-template-columns: 1fr;
    }

    .security-image {
        order: -1;
    }
}

/* ========================================
   Use Cases Section
   ======================================== */
.use-cases {
    padding: var(--spacing-24) 0;
    background: var(--color-gray-50);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-6);
}

.use-case-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    text-align: center;
    border: 1px solid var(--color-gray-100);
    transition: all var(--transition-base);
}

.use-case-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.use-case-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-4);
}

.use-case-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.use-case-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: 1.6;
}

@media (max-width: 968px) {
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
    padding: var(--spacing-24) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    color: var(--color-white);
}

.cta-content {
    text-align: center;
}

.cta-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
}

.cta-description {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-8);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-12) 0;
    background: var(--color-gray-900);
    color: var(--color-white);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-6);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
}

.footer-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: var(--spacing-8);
}

.footer-links a {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-copyright {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

/* ========================================
   Legal Pages (Privacy, Terms)
   ======================================== */
.legal-page {
    padding-top: calc(64px + var(--spacing-16));
    padding-bottom: var(--spacing-16);
    min-height: calc(100vh - 200px);
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    letter-spacing: -0.02em;
}

.legal-updated {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-12);
}

.legal-content section {
    margin-bottom: var(--spacing-10);
}

.legal-content h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-2);
    border-bottom: 2px solid var(--color-gray-100);
}

.legal-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-top: var(--spacing-6);
    margin-bottom: var(--spacing-3);
}

.legal-content p {
    margin-bottom: var(--spacing-4);
    line-height: 1.8;
    color: var(--color-gray-700);
}

.legal-content ul {
    margin-bottom: var(--spacing-4);
    padding-left: var(--spacing-6);
}

.legal-content li {
    list-style: disc;
    margin-bottom: var(--spacing-2);
    line-height: 1.7;
    color: var(--color-gray-700);
}

.legal-content li strong {
    color: var(--color-gray-900);
}

.legal-content small {
    color: var(--color-gray-500);
}

.contact-info {
    background: var(--color-gray-50);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
}

.legal-summary {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.05) 0%, rgba(175, 82, 222, 0.05) 100%);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
}

.legal-summary h2 {
    border-bottom: none;
    padding-bottom: 0;
}

.summary-box ul {
    padding-left: var(--spacing-5);
}

.summary-box li {
    color: var(--color-gray-900);
}

/* ========================================
   Utilities
   ======================================== */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here if needed */
}