/* Import unified theme */
@import url('/styles/ui_theme.css');

/* Physical Systems Tier Specific Overrides */
body {
    /* Use dark theme with physical systems branding */
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
}

/* Header */
.header {
    margin-bottom: var(--space-12);
    text-align: center;
}

.logo {
    width: 80px;
    height: 80px;
    transition: transform var(--transition-normal);
}

.logo:hover {
    transform: scale(1.05);
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--space-16);
    padding: var(--space-12) var(--space-4);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(147, 51, 234, 0.1));
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-glow-blue);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-4);
    letter-spacing: var(--letter-spacing-tight);
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    color: #93C5FD;
    margin-bottom: var(--space-6);
    font-weight: var(--font-weight-medium);
}

.hero-description {
    font-size: var(--font-size-lg);
    max-width: 800px;
    margin: 0 auto;
    color: #D1D5DB;
    line-height: var(--line-height-relaxed);
}

/* Page Navigation */
.page-nav {
    margin-bottom: var(--space-8);
    padding: var(--space-4);
    background-color: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-subtle);
}

.page-nav a {
    color: #60A5FA;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

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

/* Principle Section */
.principle {
    background-color: rgba(147, 51, 234, 0.15);
    border: 2px solid rgba(147, 51, 234, 0.4);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-12);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.principle h2 {
    color: #C084FC;
    margin-bottom: var(--space-4);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
}

.principle p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-3);
    line-height: var(--line-height-relaxed);
}

/* Content Sections */
.content-section {
    margin-bottom: var(--space-12);
}

.content-section h2 {
    color: var(--color-primary);
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-6);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--space-2);
    font-weight: var(--font-weight-bold);
}

.content-section h3 {
    color: #93C5FD;
    font-size: var(--font-size-2xl);
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
    font-weight: var(--font-weight-semibold);
}

.content-section h4 {
    color: #60A5FA;
    font-size: var(--font-size-xl);
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
    font-weight: var(--font-weight-semibold);
}

.content-section p {
    margin-bottom: var(--space-4);
    line-height: var(--line-height-relaxed);
}

.content-section ul,
.content-section ol {
    margin-left: var(--space-6);
    margin-bottom: var(--space-4);
}

.content-section li {
    margin-bottom: var(--space-2);
    line-height: var(--line-height-relaxed);
}

.section-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-6);
    color: #D1D5DB;
    line-height: var(--line-height-relaxed);
}

/* Features Grid */
.features {
    margin-bottom: var(--space-16);
}

.features h2 {
    text-align: center;
    color: var(--color-primary);
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-8);
    font-weight: var(--font-weight-bold);
}

.feature-card {
    background-color: rgba(30, 41, 59, 0.6);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-6);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-secondary);
    box-shadow: var(--shadow-lg), var(--shadow-glow-blue);
}

.feature-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-4);
}

.feature-title {
    color: #93C5FD;
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-3);
    font-weight: var(--font-weight-semibold);
}

.feature-description {
    color: #D1D5DB;
    line-height: var(--line-height-relaxed);
}

/* Use Cases Grid */
.use-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.use-case {
    background-color: rgba(30, 41, 59, 0.6);
    border: 2px solid rgba(37, 99, 235, 0.2);
    border-radius: 8px;
    padding: 1.5rem;
}

.use-case h4 {
    color: #93C5FD;
    margin-bottom: 0.75rem;
}

.use-case ul {
    margin-left: 1.25rem;
}

.use-case li {
    color: #D1D5DB;
    margin-bottom: 0.5rem;
}

/* Lists */
.not-for-list,
.not-replace-list {
    list-style: none;
    margin-left: 0;
}

.not-for-list li,
.not-replace-list li {
    padding-left: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

/* Comparison */
.comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.comparison-item {
    background-color: rgba(30, 41, 59, 0.6);
    border: 2px solid rgba(37, 99, 235, 0.2);
    border-radius: 8px;
    padding: 1.5rem;
}

.comparison-item h4 {
    color: #93C5FD;
    margin-bottom: 1rem;
}

/* Dual Benefit */
.dual-benefit {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.benefit-item {
    background-color: rgba(34, 197, 94, 0.1);
    border: 2px solid rgba(34, 197, 94, 0.3);
    border-radius: 8px;
    padding: 1.5rem;
}

.benefit-item h4 {
    color: #4ADE80;
    margin-bottom: 0.75rem;
}

/* Pricing Info */
.pricing-info {
    background-color: rgba(30, 41, 59, 0.6);
    border: 2px solid rgba(37, 99, 235, 0.3);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
}

.pricing-info h4 {
    color: #93C5FD;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.pricing-info p {
    margin-bottom: 0.75rem;
}

.pricing-note {
    font-size: 0.95rem;
    color: #9CA3AF;
    margin-top: 1rem;
}

/* Example Box */
.example-box {
    background-color: rgba(15, 23, 42, 0.8);
    border: 2px solid rgba(37, 99, 235, 0.3);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.example-box h4 {
    color: #60A5FA;
    margin-bottom: 1rem;
}

.example-box pre {
    background-color: rgba(0, 0, 0, 0.4);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    color: #D1D5DB;
}

/* Timeline */
.timeline {
    margin: 2rem 0;
}

.timeline-item {
    background-color: rgba(30, 41, 59, 0.6);
    border-left: 4px solid #2563EB;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.timeline-item h3 {
    color: #93C5FD;
    margin-bottom: 1rem;
}

.timeline-summary {
    background-color: rgba(147, 51, 234, 0.15);
    border: 2px solid rgba(147, 51, 234, 0.4);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
}

/* Emphasis */
.emphasis-warning {
    background-color: rgba(251, 191, 36, 0.1);
    border: 2px solid rgba(251, 191, 36, 0.3);
    border-radius: 8px;
    padding: 1rem;
    color: #FCD34D;
}

.emphasis-positive {
    background-color: rgba(34, 197, 94, 0.1);
    border: 2px solid rgba(34, 197, 94, 0.3);
    border-radius: 8px;
    padding: 1rem;
    color: #4ADE80;
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(147, 51, 234, 0.2));
    border: 2px solid rgba(37, 99, 235, 0.4);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    margin: 4rem 0 3rem;
}

.cta h2 {
    color: #2FE3FF;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.125rem;
    color: #D1D5DB;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}

.cta-button.primary {
    background-color: #2563EB;
    color: white;
    border: 2px solid #2563EB;
}

.cta-button.primary:hover {
    background-color: #1D4ED8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.cta-button.secondary {
    background-color: transparent;
    color: #60A5FA;
    border: 2px solid #60A5FA;
}

.cta-button.secondary:hover {
    background-color: rgba(37, 99, 235, 0.1);
    transform: translateY(-2px);
}

.cta-note {
    font-size: 0.95rem;
    color: #9CA3AF;
    margin-top: 1rem;
}

/* Validation Section */
.validation {
    background-color: rgba(34, 197, 94, 0.1);
    border: 2px solid rgba(34, 197, 94, 0.3);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 3rem;
    text-align: center;
}

.validation h2 {
    color: #4ADE80;
    margin-bottom: 1rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 4rem;
    border-top: 2px solid rgba(37, 99, 235, 0.3);
    color: #9CA3AF;
}

.footer p {
    margin-bottom: 0.5rem;
}

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

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .content-section h2 {
        font-size: 1.5rem;
    }

    .content-section h3 {
        font-size: 1.25rem;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .cta-button {
        width: 100%;
    }

    .use-cases {
        grid-template-columns: 1fr;
    }

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

    .dual-benefit {
        grid-template-columns: 1fr;
    }
}