/* Design System inspired by atsign.com */
:root {
    --primary-color: #F05E3E;
    --primary-dark: #D94B2E;
    --secondary-color: #03ADEA;
    --light-bg: #FFFFFF;
    --light-gray: #F5F5F5;
    --medium-gray: #E0E0E0;
    --dark-gray: #666666;
    --text-primary: #2D2D2D;
    --text-secondary: #666666;
    --success: #4CAF50;
    --warning: #FF9800;
    --danger: #F44336;
    --border-radius: 12px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--light-gray);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    padding: 1.5rem 0 0 0;
    border-bottom: 1px solid var(--medium-gray);
    background: var(--light-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    padding-bottom: 1.5rem;
}

.logo svg {
    color: var(--primary-color);
}

/* Progress Bar */
.progress-container {
    width: 100%;
    height: 4px;
    background: var(--medium-gray);
    position: relative;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 10%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Main Content */
.main-content {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

.slides-container {
    min-height: 500px;
    position: relative;
}

/* Slide Styles */
.slide {
    opacity: 0;
    transform: translateX(100px);
    position: absolute;
    width: 100%;
    pointer-events: none;
    transition: var(--transition);
}

.slide.active {
    opacity: 1;
    transform: translateX(0);
    position: relative;
    pointer-events: auto;
}

.slide.exit {
    opacity: 0;
    transform: translateX(-100px);
}

/* Slide Content */
.slide-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.6s ease-out;
}

.slide-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.slide-content {
    font-size: 1.125rem;
    line-height: 1.8;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Comparison Box */
.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.comparison-side {
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--medium-gray);
    animation: slideIn 0.6s ease-out;
}

.comparison-side.traditional {
    border-left: 4px solid var(--danger);
}

.comparison-side.networkless {
    border-left: 4px solid var(--success);
}

.comparison-side h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.comparison-side.traditional h3 {
    color: var(--danger);
}

.comparison-side.networkless h3 {
    color: var(--success);
}

.comparison-list {
    list-style: none;
}

.comparison-list li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    border-bottom: 1px solid var(--medium-gray);
    color: var(--text-primary);
}

.comparison-list li:last-child {
    border-bottom: none;
}

.comparison-list li::before {
    content: '✗';
    position: absolute;
    left: 0;
    color: var(--danger);
    font-weight: bold;
}

.comparison-side.networkless .comparison-list li::before {
    content: '✓';
    color: var(--success);
}

/* Feature Cards */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature-card {
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--medium-gray);
    transition: var(--transition);
    animation: scaleIn 0.5s ease-out;
    animation-fill-mode: both;
    box-shadow: var(--shadow);
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--medium-gray);
    animation: scaleIn 0.5s ease-out;
    animation-fill-mode: both;
    box-shadow: var(--shadow);
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

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

/* Code Block */
.code-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.code-block {
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--medium-gray);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    overflow-x: auto;
    animation: slideIn 0.6s ease-out;
    color: var(--text-primary);
}

.code-block h4 {
    margin-bottom: 1rem;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
}

/* Navigation */
.navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid var(--medium-gray);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    background: var(--primary-color);
    color: #FFFFFF;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.nav-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(240, 94, 62, 0.3);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.slide-counter {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

#currentSlide {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.5rem;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Highlight Box */
.highlight-box {
    background: rgba(240, 94, 62, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 2rem 0;
    animation: slideIn 0.6s ease-out;
    border: 1px solid var(--medium-gray);
}

.highlight-box.success {
    background: rgba(76, 175, 80, 0.1);
    border-left-color: var(--success);
}

.highlight-box.warning {
    background: rgba(255, 152, 0, 0.1);
    border-left-color: var(--warning);
}

.highlight-box h4 {
    color: var(--text-primary);
}

.highlight-box p {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .slide-title {
        font-size: 2rem;
    }

    .comparison-box,
    .code-comparison {
        grid-template-columns: 1fr;
    }

    .navigation {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-btn-prev {
        order: 2;
    }

    .slide-counter {
        order: 1;
    }

    .nav-btn-next {
        order: 3;
    }
}

/* Live Demo Styles */
.demo-container {
    margin: 2rem 0;
}

.demo-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.demo-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 50px; /* Fully rounded ends */
    background: var(--secondary-color);
    color: #FFFFFF;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.demo-btn:hover:not(:disabled) {
    background: #0299D1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(3, 173, 234, 0.3);
}

.demo-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.demo-btn.primary:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(240, 94, 62, 0.3);
}

.demo-btn.success {
    background: var(--success);
    cursor: default;
}

.demo-btn.success:hover {
    background: var(--success);
}

/* Button Icons */
.btn-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
}

/* Play Icon */
.btn-icon.play {
    background: rgba(255, 255, 255, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.6);
}

.btn-icon.play::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 4px 0 4px 7px;
    border-color: transparent transparent transparent #FFFFFF;
    margin-left: 2px;
}

/* Checkmark Icon */
.btn-icon.check {
    background: rgba(255, 255, 255, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.6);
}

.btn-icon.check::after {
    content: '';
    width: 5px;
    height: 9px;
    border: solid #FFFFFF;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-bottom: 2px;
}

/* Loading Icon */
.btn-icon.loading {
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #FFFFFF;
    animation: spin 1s linear infinite;
}


.terminal-container {
    background: #1E1E1E;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1rem 0;
    border: 1px solid var(--medium-gray);
    min-height: 200px;
    max-height: 500px;
    overflow-y: auto;
}

.terminal-output {
    color: #D4D4D4;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.port-open {
    color: #ff6b6b;
    font-weight: bold;
}

.port-closed,
.port-filtered {
    color: #51cf66;
    font-weight: bold;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: #D4D4D4;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

.error-state {
    padding: 2rem;
    text-align: center;
    color: var(--danger);
}

.success-state {
    padding: 2rem;
    text-align: center;
    color: var(--success);
    background: rgba(39, 174, 96, 0.1);
    border-radius: var(--border-radius);
}

.success-state p {
    margin: 0.5rem 0;
}

.config-selector {
    margin: 1rem 0;
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--medium-gray);
    box-shadow: var(--shadow);
}

.config-selector label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.config-selector select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--medium-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    background: var(--light-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.config-selector select:hover {
    border-color: var(--primary-color);
}

.config-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(240, 94, 62, 0.1);
}

.demo-output-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 2rem 0;
}

@media (max-width: 968px) {
    .demo-output-grid {
        grid-template-columns: 1fr;
    }
}