/* ================================================
   DOCUMENT AUTOMATION TOOL - Main Stylesheet
   Design: Dark theme with blue accent (#00F2FF)
   ================================================ */

/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --color-bg: #000000;
    --color-bg-secondary: #0a0a0a;
    --color-bg-tertiary: #111111;
    --color-bg-card: #0d0d0d;
    --color-text: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #666666;
    --color-accent: #00F2FF;
    --color-accent-hover: #00d4e0;
    --color-accent-glow: rgba(0, 242, 255, 0.3);
    --color-border: #1a1a1a;
    --color-border-accent: rgba(0, 242, 255, 0.2);
    
    /* Typography */
    --font-primary: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Inter', 'Noto Sans JP', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 242, 255, 0.2);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-header: 1000;
    --z-modal: 1100;
    --z-toast: 1200;
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Skip Link (Accessibility) ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-accent);
    color: var(--color-bg);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: var(--z-modal);
    font-weight: 600;
    text-decoration: none;
    border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
    top: 0;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, #0080ff 100%);
    border-radius: var(--radius-md);
    font-size: 1.2rem;
    color: var(--color-bg);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link:focus::after {
    width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    position: relative;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-btn.active .hamburger {
    background: transparent;
}

.mobile-menu-btn.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-btn.active .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: 70px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(0, 242, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 128, 255, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 1) 0%, var(--color-bg) 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.hero-accent {
    color: var(--color-accent);
    text-shadow: 0 0 30px var(--color-accent-glow);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.hero-cta:hover,
.hero-cta:focus {
    background: var(--color-accent);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.hero-cta i {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(5px);
    }
    60% {
        transform: translateY(3px);
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--color-text-muted);
    border-radius: 20px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

/* ===== Step Progress ===== */
.step-progress {
    position: sticky;
    top: 70px;
    z-index: 100;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

.progress-track {
    position: relative;
}

.progress-line {
    position: absolute;
    top: 50%;
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--color-border);
    transform: translateY(-50%);
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: var(--transition-normal);
}

.step-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-muted);
    transition: var(--transition-normal);
}

.step-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: var(--transition-normal);
}

.progress-step:hover .step-number,
.progress-step:focus .step-number {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.progress-step:hover .step-label,
.progress-step:focus .step-label {
    color: var(--color-text);
}

.progress-step.active .step-number {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-bg);
    box-shadow: var(--shadow-glow);
}

.progress-step.active .step-label {
    color: var(--color-accent);
}

.progress-step.completed .step-number {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-bg);
}

/* ===== Step Sections ===== */
.step-section {
    min-height: 100vh;
    padding: var(--spacing-2xl) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

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

.step-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid var(--color-border-accent);
    border-radius: var(--radius-xl);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.step-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.step-title i {
    color: var(--color-accent);
}

.step-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

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

/* Instruction Card */
.instruction-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.instruction-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 242, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.instruction-text h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

.instruction-text strong {
    color: var(--color-accent);
}

/* Step List */
.step-list {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    padding-left: 1.5rem;
    margin: 0;
}

.step-list li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.step-list li:last-child {
    margin-bottom: 0;
}

.step-list li::marker {
    color: var(--color-accent);
    font-weight: 600;
}

/* Tip Card */
.tip-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(0, 242, 255, 0.05);
    border: 1px solid var(--color-border-accent);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.tip-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 242, 255, 0.15);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.tip-text h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-accent);
}

.tip-text p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.tip-text strong {
    color: var(--color-text);
}

/* Prompt Card */
.prompt-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.prompt-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

.prompt-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
}

.prompt-header h3 i {
    color: var(--color-accent);
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid var(--color-border-accent);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.copy-btn:hover,
.copy-btn:focus {
    background: var(--color-accent);
    color: var(--color-bg);
}

.copy-btn.copied {
    background: #10b981;
    border-color: #10b981;
    color: white;
}

.prompt-content {
    padding: var(--spacing-lg);
}

.prompt-content.scrollable {
    max-height: 400px;
    overflow-y: auto;
}

.prompt-content pre {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.copy-feedback {
    text-align: center;
    padding: var(--spacing-sm);
    color: #10b981;
    font-size: 0.85rem;
    min-height: 2rem;
}

/* Scrollbar */
.prompt-content.scrollable::-webkit-scrollbar {
    width: 8px;
}

.prompt-content.scrollable::-webkit-scrollbar-track {
    background: var(--color-bg);
}

.prompt-content.scrollable::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

.prompt-content.scrollable::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Action Button */
.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent) 0%, #0080ff 100%);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--color-bg);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.action-btn:hover,
.action-btn:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.action-btn .btn-icon {
    transition: var(--transition-fast);
}

.action-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* ===== Completion Section ===== */
.completion-section {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

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

.completion-icon {
    font-size: 4rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.completion-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.completion-text {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.restart-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-lg);
    color: var(--color-accent);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
}

.restart-btn:hover,
.restart-btn:focus {
    background: var(--color-accent);
    color: var(--color-bg);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-text {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

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

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-weight: 500;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    z-index: var(--z-toast);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.toast i {
    color: #10b981;
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in.delay-1 {
    transition-delay: 0.1s;
}

.fade-in.delay-2 {
    transition-delay: 0.2s;
}

.fade-in.delay-3 {
    transition-delay: 0.3s;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.25rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }
    
    .header .container {
        height: 60px;
    }
    
    .logo-text {
        font-size: 0.75rem;
    }
    
    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.98);
        padding: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }
    
    .nav.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-link {
        font-size: 1rem;
        padding: var(--spacing-sm) 0;
        display: block;
    }
    
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .hero {
        padding-top: 60px;
    }
    
    .hero-title {
        padding: 0 var(--spacing-sm);
    }
    
    .step-progress {
        top: 60px;
        padding: var(--spacing-sm) 0;
    }
    
    .step-number {
        width: 40px;
        height: 40px;
        font-size: 0.8rem;
    }
    
    .step-label {
        font-size: 0.65rem;
    }
    
    .step-section {
        min-height: auto;
        padding: var(--spacing-xl) 0;
    }
    
    .instruction-card {
        flex-direction: column;
        text-align: center;
    }
    
    .prompt-header {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .prompt-content.scrollable {
        max-height: 300px;
    }
    
    .prompt-content pre {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .logo-icon {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .logo-text {
        display: none;
    }
    
    .progress-line {
        left: 5%;
        right: 5%;
    }
    
    .step-number {
        width: 36px;
        height: 36px;
        font-size: 0.75rem;
    }
    
    .step-label {
        font-size: 0.6rem;
    }
    
    .action-btn {
        font-size: 1rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* ===== Focus States (Accessibility) ===== */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
    outline: none;
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .fade-in {
        opacity: 1;
        transform: none;
    }
}

/* ===== Print Styles ===== */
@media print {
    .header,
    .step-progress,
    .scroll-indicator,
    .toast {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .prompt-content {
        border: 1px solid #ccc;
    }
}