/* ===== 基本設定 ===== */
:root {
    /* カラー */
    --color-bg-primary: #23272A; /* Discord Dark Theme Base */
    --color-bg-secondary: #2C2F33; /* Discord Darker */
    --color-bg-tertiary: #36393F;   /* Discord Input/Embed Background */
    --color-accent-primary: #5865F2; /* Discord Blurple */
    --color-accent-secondary: #43B581; /* Discord Green (online status, success) */
    --color-accent-tertiary: #FAA61A; /* Discord Yellow (idle status, warning) */
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B9BBBE; /* Discord Channel/Message Text */
    --color-text-muted: #72767D;   /* Discord Muted Text/Placeholder */
    --color-warning: #ED4245; /* Discord Red (mention, error) */
    --color-success: var(--color-accent-secondary); /* Consistent Success Green */
    --color-warning-rgb: 237, 66, 69; /* For .feature-box.security */

    /* Glassmorphism for Rosca - slightly different from main to fit Discord theme */
    --rosca-glass-bg: rgba(44, 47, 51, 0.7); /* Darker glass for Discord feel */
    --rosca-glass-border: 1px solid rgba(88, 101, 242, 0.3); /* Blurple border */
    --rosca-glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --rosca-glass-blur: 8px;
    
    /* フォント */
    --font-primary: 'Poppins', 'Inter', 'Whitney', 'Helvetica Neue', Helvetica, Arial, sans-serif; /* Added Whitney for Discord feel */
    --font-secondary: 'Inter', 'Whitney', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    
    /* アニメーション */
    --transition-fast: 0.2s;
    --transition-medium: 0.3s;
    --transition-slow: 0.5s;
    
    /* サイズ */
    --container-width: 1200px;
    --border-radius-sm: 3px; /* Discord's typical border radius */
    --border-radius-md: 5px;
    --border-radius-lg: 8px;
}

/* ===== リセットとベース ===== */
* {
    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-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

a {
    text-decoration: none;
    color: var(--color-accent-primary); /* Default link to Blurple */
    transition: color var(--transition-fast) ease;
}

a:hover {
    color: var(--color-text-primary);
    text-decoration: underline;
}

ul {
    list-style: none;
}

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

/* ===== 背景効果 (既存のものを維持、必要に応じて調整) ===== */
.noise {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/png;base64,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');
    opacity: 0.03; /* Slightly reduced for darker theme */
    z-index: -2;
    pointer-events: none;
}

.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at top center, rgba(88, 101, 242, 0.15) 0%, rgba(35, 39, 42, 0) 60%); /* Blurple accent, fades to dark */
    z-index: -1;
    pointer-events: none;
}


/* ===== ヘッダーとナビゲーション ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--rosca-glass-bg);
    backdrop-filter: blur(var(--rosca-glass-blur));
    -webkit-backdrop-filter: blur(var(--rosca-glass-blur));
    border-bottom: var(--rosca-glass-border);
    transition: all var(--transition-medium) ease;
    box-shadow: var(--rosca-glass-shadow);
}

header.scrolled {
    background-color: rgba(30, 31, 34, 0.85); /* Darker on scroll */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem; /* Slightly reduced padding */
    max-width: var(--container-width);
    margin: 0 auto;
}

.logo span { /* Ensure logo text matches Rosca style */
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text-primary); /* White logo text */
    text-shadow: 0 0 8px rgba(88, 101, 242, 0.7); /* Blurple glow */
}

.nav-links {
    display: flex;
    gap: 1.8rem; /* Slightly adjusted gap */
}

.nav-links a {
    position: relative;
    font-weight: 500;
    padding: 0.5rem 0;
    color: var(--color-text-secondary);
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px; /* Positioned slightly lower */
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-primary);
    border-radius: 2px;
    transition: width var(--transition-medium) ease;
}

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

.cta-buttons .btn-primary {
    background-color: var(--color-accent-primary);
    color: white;
    border: none;
    box-shadow: 0 2px 10px rgba(88, 101, 242, 0.3);
}

.cta-buttons .btn-primary:hover {
    background-color: #4752c4; /* Darker Blurple */
    box-shadow: 0 4px 15px rgba(88, 101, 242, 0.5);
    transform: translateY(-2px);
}


/* ===== ヒーローセクション ===== */
#hero {
    min-height: 90vh; /* Adjusted height */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding: 6rem 2rem 4rem; /* Added padding */
    background: transparent; /* Rely on .gradient-bg and .noise */
}

#hero::before { /* Optional: subtle overlay if needed */
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(35, 39, 42, 0.5) 0%, rgba(35, 39, 42, 0.9) 100%);
    z-index: 0;
}


.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeIn 1s ease-out forwards;
}

.hero-logo {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-logo h1 {
    font-size: clamp(3rem, 10vw, 5.5rem); /* Responsive font size */
    font-weight: 700;
    color: var(--color-text-primary);
    text-shadow: 0 0 15px rgba(88, 101, 242, 0.6), 0 0 30px rgba(88, 101, 242, 0.4);
    margin: 0;
    line-height: 1.1;
}

.logo-glow { /* This can be enhanced if needed */
    width: 150px;
    height: 150px;
    background-image: radial-gradient(circle, var(--color-accent-primary) 0%, transparent 70%);
    opacity: 0.3;
    filter: blur(30px);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1.5);
    animation: pulse 4s infinite ease-in-out;
    z-index: -1;
}


.hero-description {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons .btn-primary {
    padding: 0.9rem 2.2rem;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.hero-buttons .btn-primary i {
    margin-right: 0.7rem;
    font-size: 1.2em;
}


/* Scroll Indicator - Keeping it simple and fitting Discord aesthetic */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.8;
    transition: opacity var(--transition-medium) ease;
    z-index: 2;
}

.scroll-indicator.hidden {
    opacity: 0;
}

.mouse {
    width: 25px;
    height: 40px;
    border: 2px solid var(--color-text-secondary);
    border-radius: 15px;
    position: relative;
    margin: 0 auto 10px;
}

.wheel {
    width: 4px;
    height: 8px;
    background-color: var(--color-text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: wheel 1.5s infinite ease-in-out;
}

@keyframes wheel {
    0%, 100% { top: 8px; opacity: 1; }
    50% { top: 15px; opacity: 0.5; }
}

.arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.arrow span {
    display: block;
    width: 10px;
    height: 10px;
    border-bottom: 2px solid var(--color-text-secondary);
    border-right: 2px solid var(--color-text-secondary);
    transform: rotate(45deg);
    margin-bottom: -6px; /* Overlap for chevron effect */
    animation: bounce 1.5s infinite ease-in-out;
}
.arrow span:nth-child(2) { animation-delay: 0.1s; }
.arrow span:nth-child(3) { animation-delay: 0.2s; }


/* ===== セクション共通 ===== */
section {
    padding: 5rem 0;
    position: relative;
}

section:nth-child(even) { /* Alternating background for sections if desired */
    background-color: var(--color-bg-secondary);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 70px;
    height: 4px;
    background-color: var(--color-accent-primary);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem auto;
    line-height: 1.7;
}


/* ===== 機能ショーケースセクション (rosca-showcase) ===== */
.rosca-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    align-items: center; /* Align items if they have different heights */
}

.rosca-showcase-item {
    background: var(--rosca-glass-bg);
    backdrop-filter: blur(var(--rosca-glass-blur));
    -webkit-backdrop-filter: blur(var(--rosca-glass-blur));
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--rosca-glass-shadow);
    border: var(--rosca-glass-border);
    transition: transform var(--transition-medium) ease, box-shadow var(--transition-medium) ease;
    color: var(--color-text-secondary); /* Default text color for items */
}

.rosca-showcase-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(88, 101, 242, 0.3);
    border-color: rgba(88, 101, 242, 0.5);
}

.rosca-showcase-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.rosca-showcase-item h3 i {
    color: var(--color-accent-primary);
    margin-right: 0.75rem;
    font-size: 1.3em;
    width: 25px; /* Consistent icon width */
    text-align: center;
}

.rosca-showcase-item p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.rosca-showcase-item .feature-list {
    margin-bottom: 1.5rem;
    padding-left: 0; /* Remove default padding if any */
}

.rosca-showcase-item .feature-list li {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    font-size: 0.95rem;
}

.rosca-showcase-item .feature-list li i.fa-check {
    color: var(--color-success);
    margin-right: 0.75rem;
    font-size: 1.1em;
}

.command-preview { /* Enhanced command preview */
    background-color: var(--color-bg-tertiary);
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius-md);
    font-family: 'Consolas', 'Menlo', 'Monaco', monospace;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
    transition: all var(--transition-fast) ease;
    position: relative;
    overflow: hidden;
}

.command-preview code {
    color: var(--color-text-primary); /* Make code text stand out */
}

.command-preview:hover {
    border-color: var(--color-accent-primary);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2), 0 0 10px rgba(88, 101, 242, 0.2);
}


.rosca-image {
    position: relative;
    text-align: center; /* Center image if it's smaller */
}

.rosca-preview {
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 100%;
    display: block; /* Remove extra space below image */
    margin: 0 auto; /* Center image */
}

.preview-overlay { /* Can be used for subtle gradient or hover effect on image */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--border-radius-lg);
    background: linear-gradient(transparent, rgba(0,0,0,0.2));
    pointer-events: none;
}

.floating-features {
    position: absolute;
    bottom: -120px; /* Changed from 20px to 40px */
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
    z-index: 1; /* Ensure they are above overlay */
}

.floating-feature {
    background: var(--rosca-glass-bg);
    backdrop-filter: blur(var(--rosca-glass-blur));
    -webkit-backdrop-filter: blur(var(--rosca-glass-blur));
    border: var(--rosca-glass-border);
    padding: 0.7rem 1.2rem;
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    box-shadow: var(--rosca-glass-shadow);
    transition: all var(--transition-medium) ease;
    text-shadow: 0 0 5px rgba(0,0,0,0.5);
    min-width: 150px;
    justify-content: center;
}

.floating-feature:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px rgba(88, 101, 242, 0.25);
    color: var(--color-text-primary);
}

.floating-feature i {
    margin-right: 0.6rem; /* Slightly adjusted margin */
    color: var(--color-accent-primary);
}


/* ===== 機能詳細セクション (features-grid) ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-box {
    background: var(--rosca-glass-bg);
    backdrop-filter: blur(var(--rosca-glass-blur));
    -webkit-backdrop-filter: blur(var(--rosca-glass-blur));
    border-radius: var(--border-radius-lg);
    padding: 2rem 1.5rem;
    box-shadow: var(--rosca-glass-shadow);
    border: var(--rosca-glass-border);
    transition: transform var(--transition-medium) ease, box-shadow var(--transition-medium) ease, border-color var(--transition-medium) ease;
    display: flex;
    flex-direction: column;
}

.feature-box:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 45px rgba(88, 101, 242, 0.25);
    border-color: rgba(88, 101, 242, 0.6);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--color-accent-primary);
    margin-bottom: 1rem;
    text-align: center;
    height: 50px; /* Fixed height for icon area */
    line-height: 50px; /* Vertically center icon */
}

.feature-box h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.75rem;
    text-align: center;
}

.feature-content {
    flex-grow: 1; /* Allow content to grow and push command-example down */
    display: flex;
    flex-direction: column;
}

.feature-content p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    text-align: center; /* Center short descriptions */
    flex-grow: 1;
}

.feature-list { /* Used inside feature-box */
    padding-left: 0;
    margin-bottom: 1rem;
}

.feature-list li {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: flex-start; /* Align items to start for multi-line text */
}

.feature-list li::before { /* Custom bullet point */
    content: '\f058'; /* Font Awesome check-circle icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900; /* Solid icon */
    color: var(--color-accent-secondary); /* Green check */
    margin-right: 0.75rem;
    font-size: 1em;
    line-height: 1.6; /* Align with text */
}


.command-example {
    background-color: var(--color-bg-tertiary);
    padding: 0.7rem 1rem;
    border-radius: var(--border-radius-md);
    font-family: 'Consolas', 'Menlo', 'Monaco', monospace;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: auto; /* Pushes to the bottom of the card */
    border: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
}
.command-example code {
    color: var(--color-text-primary);
}

.feature-box.security { /* Special styling for security box if needed */
    border-color: rgba(var(--color-warning-rgb), 0.4); 
}

.feature-box.security:hover {
    border-color: var(--color-warning);
    box-shadow: 0 15px 45px rgba(var(--color-warning-rgb), 0.25);
}

.feature-box.security .feature-icon i {
    color: var(--color-warning);
}

.security-features {
    margin-top: 1rem;
}

.security-feature-item {
    background: rgba(var(--color-warning-rgb), 0.1);
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
}

.security-feature-item i {
    color: var(--color-warning);
    margin-right: 0.5rem;
}

.features-motto {
    text-align: center;
    margin-top: 3rem;
    font-size: 1.2rem;
    font-style: italic;
    color: var(--color-text-secondary);
}
.features-motto p::before, .features-motto p::after {
    content: '"';
    color: var(--color-accent-primary);
    font-weight: bold;
}


/* ===== 導入ガイドセクション (guide-steps) ===== */
#guide {
    background-color: var(--color-bg-secondary); /* Give guide a distinct background */
}

.guide-steps {
    background: var(--color-bg-primary); /* Inner container for steps */
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.step-indicators {
    display: flex;
    justify-content: space-around;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-bg-tertiary);
    position: relative;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--transition-medium) ease, transform var(--transition-medium) ease;
    flex: 1; /* Distribute space evenly */
    text-align: center;
    position: relative; /* For pseudo-elements */
}
.step:not(:last-child)::after { /* Connector line */
    content: '';
    position: absolute;
    top: 20px; /* Vertically center with span */
    left: 50%;
    width: calc(100% - 40px); /* Span between circles */
    height: 2px;
    background-color: var(--color-bg-tertiary);
    z-index: 0;
    transform: translateX(20px);
}
.step.active::before { /* Active line segment */
    content: '';
    position: absolute;
    top: 20px;
    left: -50%;
    width: 100%;
    height: 2px;
    background-color: var(--color-accent-primary);
    z-index: 1;
    transform: translateX(20px);
}
.step:first-child.active::before {
    left: 0;
    width: 50%;
    transform: translateX(20px);
}
.step.active:not(:first-child)::before {
     width: 100%;
     left: -50%;
}


.step span { /* Step number circle */
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    transition: background-color var(--transition-medium) ease, color var(--transition-medium) ease, transform var(--transition-medium) ease;
    border: 2px solid var(--color-bg-tertiary);
    position: relative;
    z-index: 2; /* Above connector lines */
}

.step p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-medium) ease;
}

.step:hover span {
    background-color: var(--color-accent-primary);
    color: var(--color-text-primary);
    border-color: var(--color-accent-primary);
    transform: scale(1.1);
}
.step:hover p {
    color: var(--color-accent-primary);
}

.step.active {
    opacity: 1;
}

.step.active span {
    background-color: var(--color-accent-primary);
    color: var(--color-text-primary);
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 15px rgba(88, 101, 242, 0.5);
    transform: scale(1.1);
}

.step.active p {
    color: var(--color-text-primary);
    font-weight: 600;
}

.step-content {
    min-height: 300px; /* Ensure consistent height */
    position: relative;
}

.step-details {
    display: none; /* Hidden by default */
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease;
    text-align: left; /* Content within step details */
}

.step-details.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.step-details h3 {
    font-size: 1.8rem;
    color: var(--color-text-primary);
    margin-bottom: 1rem;
}

.step-details p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}
.step-details .btn { /* Style for buttons within step details */
    margin-top: 1rem;
}

.step-image {
    max-width: 100%; /* Ensure image is responsive */
    border-radius: var(--border-radius-md);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    margin-top: 1.5rem;
}

.image-placeholder { /* For steps without specific images */
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-md);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-style: italic;
}

.permission-list, .customize-options {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.permission-list li, .customize-options li {
    margin-bottom: 0.75rem;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
}

.permission-list li::before, .customize-options li::before {
    content: '\f00c'; /* Font Awesome check icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900; /* Solid */
    color: var(--color-success);
    margin-right: 0.75rem;
}

.command-examples { /* Container for command examples in guide */
    background-color: var(--color-bg-tertiary);
    padding: 1.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.command-examples .command {
    margin-bottom: 1rem;
    font-family: 'Consolas', 'Menlo', 'Monaco', monospace;
}
.command-examples .command code {
    background-color: var(--color-bg-primary);
    padding: 0.3rem 0.6rem;
    border-radius: var(--border-radius-sm);
    color: var(--color-accent-primary);
    font-weight: bold;
}
.command-examples .command .description {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 0.3rem;
    margin-left: 0.5rem;
}


/* ===== CTAセクション ===== */
#cta {
    background-color: var(--color-accent-primary);
    padding: 4rem 0;
    text-align: center;
    color: var(--color-text-primary);
    position: relative;
    overflow: hidden;
}

#cta::before { /* Subtle pattern or texture */
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(45deg, rgba(255,255,255,0.05) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.05) 50%, rgba(255,255,255,0.05) 75%, transparent 75%, transparent);
    background-size: 30px 30px;
    opacity: 0.5;
    z-index: 0;
}

#cta .container {
    position: relative;
    z-index: 1;
}

#cta h2 {
    font-size: clamp(2rem, 5vw, 2.8rem);
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}
#cta h2::after { /* Remove section title underline for CTA */
    display: none;
}

#cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: rgba(255,255,255,0.85);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

#cta .cta-buttons .btn { /* Make CTA buttons stand out */
    padding: 0.8rem 2rem;
    font-size: 1.05rem;
    background-color: var(--color-text-primary);
    color: var(--color-accent-primary);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    border: none;
}

#cta .cta-buttons .btn:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}
#cta .cta-buttons .btn i {
    margin-right: 0.6rem;
}


/* ===== フッター ===== */
footer {
    background-color: var(--color-bg-secondary);
    padding: 3rem 0 1.5rem;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-bg-tertiary);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-accent-primary);
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    justify-content: center;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}
.footer-links a:hover {
    color: var(--color-accent-primary);
    text-decoration: underline;
}

.social-links {
        display: flex;
        gap: 1rem;
    margin-bottom: 1.5rem;
}

.social-icon {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast) ease, transform var(--transition-fast) ease;
}

.social-icon:hover {
    color: var(--color-accent-primary);
    transform: scale(1.2);
}

.footer-bottom {
    border-top: 1px solid var(--color-bg-tertiary);
    padding-top: 1.5rem;
    margin-top: 1.5rem; /* Add margin if not already there */
    width: 100%;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ===== アニメーションクラス (既存のものを活用・調整) ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--transition-medium) ease-out, transform 0.6s var(--transition-medium) ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}
/* Add other animation classes (slide-in-left, slide-in-right, scale-in) if needed and ensure they are consistent */
.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}
/* ... and so on for other animations */


/* ===== レスポンシブデザイン ===== */
@media (max-width: 1024px) {
    .hero-logo h1 {
        font-size: 4rem;
    }
    .section-title {
        font-size: 2.5rem;
    }
    .features-grid, .rosca-showcase {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    nav {
        padding: 0.8rem 1rem;
    }
    .nav-links { /* Hide for hamburger */
        display: none;
        flex-direction: column;
    position: absolute;
        top: 100%; /* Position below header */
        left: 0;
    width: 100%;
        background-color: var(--rosca-glass-bg);
        backdrop-filter: blur(var(--rosca-glass-blur));
        padding: 1rem 0;
        border-top: 1px solid var(--rosca-glass-border);
        box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    }
    .nav-links.active {
        display: flex;
    }
    .nav-links a {
        padding: 0.8rem 1.5rem;
        text-align: center;
        width: 100%;
    }
    .nav-links a::after { display: none; } /* Remove underline animation for mobile menu */

    .hamburger {
        display: flex; /* Show hamburger */
        z-index: 1001; /* Above nav links if they overlap */
    }
    /* Hamburger active state for X icon */
    .hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }


    .hero-logo h1 {
        font-size: 3rem;
    }
    .hero-description {
        font-size: 1rem;
        padding: 0 1rem;
    }
    .hero-buttons .btn-primary {
        padding: 0.8rem 1.8rem;
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }
    .section-description {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .step-indicators {
        flex-direction: column;
        gap: 1.5rem;
        border-bottom: none;
    }
    .step:not(:last-child)::after, .step.active::before { /* Remove connector lines for vertical layout */
        display: none;
    }
    .step span { width: 35px; height: 35px; font-size: 1rem; }
    .step p { font-size: 0.85rem; }

    .guide-steps { padding: 1.5rem; }
    .step-content { min-height: auto; } /* Adjust height for mobile */

    .floating-features {
        position: static; /* Change from absolute */
        transform: none;
        flex-direction: column; /* Stack vertically */
        align-items: center;
        margin-top: 1.5rem;
        gap: 0.8rem;
    }
    .rosca-showcase {
        grid-template-columns: 1fr; /* Stack items */
    }
    .rosca-image { margin-top: 2rem; }

    #cta h2 { font-size: 1.8rem; }
    #cta p { font-size: 1rem; }

    .footer-links { gap: 1rem; }
}

@media (max-width: 480px) {
    .hero-logo h1 {
        font-size: 2.5rem;
    }
    .hero-description {
        font-size: 0.9rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .section-description {
        font-size: 0.9rem;
    }
    .feature-box, .rosca-showcase-item {
        padding: 1.5rem;
    }
    .feature-box h3, .rosca-showcase-item h3 {
        font-size: 1.2rem;
    }
    .command-preview, .command-example {
        font-size: 0.8rem;
    }
    .cta-buttons .btn, #cta .cta-buttons .btn { /* Ensure CTA button is also responsive */
        width: 100%;
        padding: 0.8rem 1rem;
        font-size: 0.95rem;
    }
    #cta .cta-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    }
    .floating-feature {
        width: 80%;
    justify-content: center;
    }
}

/* Additional utility for neon button if used (from design_improvements.md) */
.neon-button {
  position: relative;
  display: inline-flex; /* Use inline-flex for icon alignment */
  align-items: center;
  justify-content: center;
  padding: 15px 30px;
  color: #fff;
  background: transparent;
  border: 2px solid var(--color-accent-primary); /* Use Blurple for Rosca */
    border-radius: var(--border-radius-md);
  text-transform: uppercase;
  letter-spacing: 1px; /* Adjusted spacing */
  overflow: hidden;
  transition: 0.5s;
    cursor: pointer;
    font-weight: 600;
}

.neon-button:hover {
  background: var(--color-accent-primary);
  color: white; /* Ensure text is white on hover */
  box-shadow: 0 0 10px var(--color-accent-primary), 0 0 20px var(--color-accent-primary), 0 0 40px var(--color-accent-primary);
    transform: translateY(-2px);
}

.neon-button span { /* Animated spans for glow effect - keep as is if functional */
    position: absolute;
  display: block;
}
.neon-button span:nth-child(1) {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent-primary));
  animation: btn-anim1 1s linear infinite;
}
@keyframes btn-anim1 { 0% { left: -100%; } 50%,100% { left: 100%; } }

.neon-button span:nth-child(2) {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, var(--color-accent-primary));
  animation: btn-anim2 1s linear infinite;
  animation-delay: .25s
}
@keyframes btn-anim2 { 0% { top: -100%; } 50%,100% { top: 100%; } }

.neon-button span:nth-child(3) {
  bottom: 0;
  right: -100%;
    width: 100%;
  height: 2px;
  background: linear-gradient(270deg, transparent, var(--color-accent-primary));
  animation: btn-anim3 1s linear infinite;
  animation-delay: .5s
}
@keyframes btn-anim3 { 0% { right: -100%; } 50%,100% { right: 100%; } }

.neon-button span:nth-child(4) {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, transparent, var(--color-accent-primary));
  animation: btn-anim4 1s linear infinite;
  animation-delay: .75s
}
@keyframes btn-anim4 { 0% { bottom: -100%; } 50%,100% { bottom: 100%; } }

.neon-button i { margin-right: 8px; } /* For icons inside neon buttons */


/* Gradient button (from design_improvements.md, adapted for Rosca) */
.gradient-button {
  padding: 12px 24px;
  /* Using Discord's Blurple and a slightly lighter shade for gradient */
  background-image: linear-gradient(to right, var(--color-accent-primary), #7289DA);
  border: none;
  border-radius: 50px; /* Pill shape */
  color: white;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 8px 15px rgba(88, 101, 242, 0.25);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: inline-flex;
    align-items: center;
    justify-content: center;
}

.gradient-button:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 25px rgba(88, 101, 242, 0.35);
}

.gradient-button:active {
  transform: translateY(1px);
  box-shadow: 0 5px 10px rgba(88, 101, 242, 0.2);
}
.gradient-button i { margin-right: 8px; }

/* Ensure generic .btn styles from main style.css are available or define alternatives */
.btn { /* Basic button styling if not using neon or gradient */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.3rem;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    transition: all var(--transition-fast) ease;
    border: none;
    position: relative;
    overflow: hidden;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border: 1px solid transparent;
}
.btn:hover {
    background-color: var(--color-accent-primary);
    color: var(--color-text-primary);
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(88,101,242,0.2);
}
.btn i { margin-right: 0.5rem; }

/* Ensure FontAwesome icons have consistent color */
i.fas, i.fab, i.far { /* General FontAwesome icon styling */
    transition: color var(--transition-fast) ease;
}

.hamburger span {
    display: block;
    height: 2px; /* spanの高さも調整 */
    width: 100%;
    background-color: var(--color-text-primary);
    border-radius: 3px;
    transition: all var(--transition-fast) ease;
}

/* ===== モバイルメニュー ===== */
.mobile-menu {
    position: fixed;
    top: 0;
    left: -100%; /* Initially hidden */
    width: 80%; /* Adjust width as needed */
    max-width: 300px;
    height: 100%;
    background-color: var(--color-bg-secondary); /* Roscaの背景色に合わせる */
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    transition: left var(--transition-medium) ease;
    padding: 2rem;
    z-index: 1001; /* Ensure it's above the header */
    overflow-y: auto; /* Allow scrolling if content overflows */
}

.mobile-menu.active {
    left: 0;
}

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.mobile-menu-links a {
    color: white;
    font-size: 1.2rem;
    text-decoration: none;
}

.mobile-cta-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.close-menu {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 2rem;
    color: white;
    cursor: pointer;
}

body.menu-open {
    overflow: hidden;
}

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

    .hamburger {
        display: flex; 
        width: 25px; /* 幅を狭く */
        height: 18px; /* 高さを調整 */
    }
    .hamburger span {
        height: 2px; /* spanの高さも調整 */
    }

    /* モバイルメニュー内の要素の表示を制御 */
    .mobile-menu .nav-links {
        display: flex;
        flex-direction: column;
        align-items: center; /* 中央揃え */
        gap: 1.5rem; /* 適切な間隔 */
    }

    .mobile-menu .nav-links a {
        display: block;
        color: white;
        font-size: 1.3rem; /* 文字サイズ調整 */
        padding: 0.5rem 0;
    }

    .mobile-menu .cta-buttons {
        display: flex;
        flex-direction: column;
        align-items: center; /* 中央揃え */
        gap: 1rem; /* 適切な間隔 */
        margin-top: 2rem; /* 上部のマージン */
    }

    .mobile-menu .cta-buttons .btn {
        display: block;
        width: 80%; /* ボタンの幅を調整 */
        text-align: center;
    }
}