/* ===========================
   LuxeTax Insight - Main Styles
   Dark & Gold Aesthetic
   =========================== */

:root {
    /* Color Palette */
    --color-background: #0a0a0a;
    --color-surface: #1a1a1a;
    --color-surface-light: #2a2a2a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b8b8b8;
    --color-gold: #d4af37;
    --color-gold-light: #f0d478;
    --color-gold-dark: #b8942a;
    --color-accent: #c9a961;
    --color-danger: #dc3545;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-display: 'Cormorant Garamond', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Animation */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===========================
   Reset & Base Styles
   =========================== */

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

a:hover {
    color: var(--color-gold);
}

/* ===========================
   Container & Layout
   =========================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===========================
   Navigation
   =========================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar-brand i {
    color: var(--color-gold);
    font-size: 1.8rem;
}

.brand-text {
    font-family: var(--font-display);
    letter-spacing: 1px;
}

.brand-accent {
    color: var(--color-gold);
    font-style: italic;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    position: relative;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-weight: 500;
    letter-spacing: 0.5px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-gold);
    transform: translateX(-50%);
    transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.navbar-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-gold);
    transition: all var(--transition-fast);
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(212, 175, 55, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(212, 175, 55, 0.03) 0%, transparent 50%);
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        linear-gradient(45deg, transparent 40%, rgba(212, 175, 55, 0.02) 50%, transparent 60%);
    animation: heroShine 20s linear infinite;
}

@keyframes heroShine {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
}

.hero-title-accent {
    display: block;
    font-weight: 700;
    color: var(--color-gold);
    font-style: italic;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.stat-item {
    padding: var(--spacing-md);
    background: rgba(212, 175, 55, 0.05);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: 8px;
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 55, 0.3);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-gold);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-arrow {
    width: 30px;
    height: 50px;
    border: 2px solid var(--color-gold);
    border-radius: 25px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    width: 6px;
    height: 6px;
    background: var(--color-gold);
    border-radius: 50%;
    transform: translateX(-50%);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { top: 10px; opacity: 1; }
    50% { top: 25px; opacity: 0.5; }
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    color: var(--color-background);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.3);
    color: var(--color-background);
}

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

.btn-secondary:hover {
    background: var(--color-gold);
    color: var(--color-background);
}

/* ===========================
   Section Styles
   =========================== */

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 1px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
}

/* ===========================
   Features Section
   =========================== */

.features {
    background: var(--color-surface);
}

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

.feature-card {
    padding: var(--spacing-md);
    background: var(--color-background);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: 12px;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    border-radius: 12px;
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--color-background);
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gold);
}

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

/* ===========================
   Simulator Section
   =========================== */

.simulator-section {
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-surface) 100%);
}

.simulator-container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--color-background);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 16px;
    padding: var(--spacing-lg);
}

.input-group {
    margin-bottom: var(--spacing-md);
}

.input-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gold);
}

.slider-container {
    position: relative;
}

.slider {
    width: 100%;
    height: 8px;
    background: var(--color-surface-light);
    border-radius: 10px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 10px rgba(212, 175, 55, 0.5);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    cursor: pointer;
    border-radius: 50%;
    border: none;
    box-shadow: 0 2px 10px rgba(212, 175, 55, 0.5);
}

.slider-value {
    text-align: center;
    margin-top: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-gold);
}

.toggle-switch {
    display: flex;
    gap: var(--spacing-sm);
}

.toggle-switch input[type="radio"] {
    display: none;
}

.toggle-switch label {
    flex: 1;
    padding: var(--spacing-sm);
    text-align: center;
    background: var(--color-surface-light);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-switch input[type="radio"]:checked + label {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--color-gold);
    color: var(--color-gold);
}

.family-icons {
    display: flex;
    gap: var(--spacing-sm);
}

.family-icon-item {
    flex: 1;
}

.family-icon-item input[type="checkbox"] {
    display: none;
}

.family-icon-item label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-surface-light);
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.family-icon-item label i {
    font-size: 2rem;
}

.family-icon-item input[type="checkbox"]:checked + label {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--color-gold);
    color: var(--color-gold);
}

.btn-calculate {
    width: 100%;
    margin-top: var(--spacing-md);
    font-size: 1.2rem;
    padding: 1.2rem;
}

/* Simulator Results */

.simulator-results {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 2px solid rgba(212, 175, 55, 0.2);
}

.result-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.result-rank {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.rank-badge {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    color: var(--color-background);
    font-size: 2.5rem;
    font-weight: 900;
    border-radius: 50%;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.4);
}

.rank-text {
    font-size: 1.1rem;
    color: var(--color-gold);
    font-weight: 600;
}

.result-chart {
    max-width: 500px;
    height: 300px;
    margin: var(--spacing-lg) auto;
}

.result-details {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    padding: var(--spacing-md);
    background: var(--color-surface-light);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-item.highlight {
    background: rgba(212, 175, 55, 0.1);
    border: 2px solid var(--color-gold);
}

.result-label {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: var(--font-display);
}

.current-tax {
    color: var(--color-danger);
}

.potential-saving {
    color: var(--color-gold);
}

.after-tax {
    color: #4ade80;
}

.recommended-strategies {
    margin-bottom: var(--spacing-lg);
}

.strategies-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-gold);
}

.strategy-list {
    display: grid;
    gap: var(--spacing-sm);
}

.strategy-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-surface-light);
    border-left: 3px solid var(--color-gold);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.strategy-item:hover {
    background: rgba(212, 175, 55, 0.1);
    transform: translateX(5px);
}

.strategy-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gold);
    color: var(--color-background);
    border-radius: 8px;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.strategy-content h5 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-gold);
}

.strategy-content p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

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

/* ===========================
   Articles Section
   =========================== */

.articles-preview {
    background: var(--color-surface);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.article-card {
    background: var(--color-background);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.article-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-content {
    padding: var(--spacing-md);
}

.article-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(212, 175, 55, 0.1);
    color: var(--color-gold);
    font-size: 0.85rem;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

.article-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-excerpt {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(212, 175, 55, 0.1);
}

.article-author {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.article-author strong {
    color: var(--color-gold);
}

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

/* ===========================
   Contact Section
   =========================== */

.contact-section {
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-background) 100%);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-gold);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--color-background);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 8px;
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-gold);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.btn-submit {
    width: 100%;
    margin-top: var(--spacing-md);
    font-size: 1.2rem;
    padding: 1.2rem;
}

/* ===========================
   Footer
   =========================== */

.footer {
    background: var(--color-surface);
    border-top: 1px solid rgba(212, 175, 55, 0.1);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-display);
    margin-bottom: var(--spacing-sm);
}

.footer-logo i {
    color: var(--color-gold);
}

.footer-tagline {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.footer-column h4 {
    color: var(--color-gold);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-column ul li a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.footer-column ul li a:hover {
    color: var(--color-gold);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-background);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--color-gold);
    border-color: var(--color-gold);
    transform: translateY(-3px);
}

.social-links a:hover i {
    color: var(--color-background);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(212, 175, 55, 0.1);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    color: var(--color-text-secondary);
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    .navbar .container {
        height: 70px;
    }
    
    .navbar-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(10, 10, 10, 0.98);
        flex-direction: column;
        padding: var(--spacing-lg);
        transition: left var(--transition-normal);
    }
    
    .navbar-menu.active {
        left: 0;
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   Animations & Utilities
   =========================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(212, 175, 55, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-gold);
    animation: spin 1s ease-in-out infinite;
}

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