/** * Copyright (c) 2026 DNA Genics, S.L. All rights reserved.
 * 
 * Admixture Calculator Information - Cinematic View
 * Dark cinematic theme with gold accents for calculator detail pages.
 */

/* ========================================
   CSS VARIABLES
   ======================================== */

:root {
    --calc-bg-dark: #0a0a0a;
    --calc-bg-dark-alt: #1a1a1a;
    --calc-bg-light: #f8f5f0;
    --calc-bg-parchment: #f5efe6;
    --calc-accent: #d4a017;
    --calc-accent-light: #f5c85d;
    --calc-accent-dark: #b8860b;
    --calc-text-light: #ffffff;
    --calc-text-dark: #1a1a1a;
    --calc-text-muted: #6c757d;
    --calc-border-light: rgba(212, 160, 23, 0.2);
    --calc-border-dark: rgba(255, 255, 255, 0.1);
    --calc-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --calc-radius: 12px;
    --calc-font-display: 'Cormorant Garamond', serif;
    --calc-font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ========================================
   SKIP LINK (Accessibility)
   ======================================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--calc-accent);
    color: var(--calc-text-dark);
    padding: 8px 16px;
    z-index: 9999;
    transition: top 0.3s;
    border-radius: 0 0 var(--calc-radius) 0;
    font-weight: 600;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--calc-accent-light);
}

/* ========================================
   PAGE NAVIGATION DOTS
   ======================================== */

.calc-page-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.calc-page-nav a {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
}

.calc-page-nav a::before {
    content: attr(data-tooltip);
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--calc-bg-dark);
    color: var(--calc-text-light);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-family: var(--calc-font-body);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.calc-page-nav a:hover::before {
    opacity: 1;
}

.calc-page-nav a:hover,
.calc-page-nav a.active {
    background: var(--calc-accent);
    border-color: var(--calc-accent-light);
    transform: scale(1.3);
}

@media (max-width: 768px) {
    .calc-page-nav {
        display: none;
    }
}

/* ========================================
   MAIN PAGE CONTAINER
   ======================================== */

.calc-cinematic-page {
    background: var(--calc-bg-dark);
    min-height: 100vh;
}

/* ========================================
   HERO SECTION
   ======================================== */

.calc-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--calc-bg-dark) 0%, var(--calc-bg-dark-alt) 100%);
    overflow: hidden;
}

.calc-hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 0%, var(--calc-bg-dark) 70%);
    pointer-events: none;
}

.calc-hero-grain {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.05'/%3E%3C/svg%3E");
    opacity: 0.4;
    pointer-events: none;
}

.calc-hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    padding: 2rem;
}

.calc-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(212, 160, 23, 0.15);
    border: 1px solid var(--calc-accent);
    color: var(--calc-accent);
    padding: 0.5rem 1.25rem;
    border-radius: 30px;
    font-family: var(--calc-font-body);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1.5rem;
}

.calc-hero-title {
    font-family: var(--calc-font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    color: var(--calc-text-light);
    line-height: 1.2;
    margin-bottom: 1rem;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.calc-hero-subtitle {
    font-family: var(--calc-font-body);
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 2rem;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .calc-hero-subtitle {
        color: rgba(255, 255, 255, 0.85);
    }
}

/* Hero Stats */
.calc-hero-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.calc-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.calc-stat i {
    font-size: 1.25rem;
    color: var(--calc-accent);
    margin-bottom: 0.5rem;
}

.calc-stat-value {
    font-family: var(--calc-font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--calc-text-light);
}

.calc-stat-label {
    font-family: var(--calc-font-body);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Hero Actions */
.calc-hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.calc-btn-primary,
.calc-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 30px;
    font-family: var(--calc-font-body);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.calc-btn-primary {
    background: linear-gradient(135deg, var(--calc-accent) 0%, var(--calc-accent-dark) 100%);
    color: var(--calc-text-dark);
    box-shadow: 0 4px 20px rgba(212, 160, 23, 0.3);
}

.calc-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(212, 160, 23, 0.4);
    color: var(--calc-text-dark);
    text-decoration: none;
}

.calc-btn-secondary {
    background: transparent;
    color: var(--calc-text-light);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.calc-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--calc-accent);
    color: var(--calc-accent);
    text-decoration: none;
}

/* Scroll Indicator */
.calc-scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    font-family: var(--calc-font-body);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
}

.calc-scroll-indicator i {
    font-size: 1.25rem;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ========================================
   SECTION STYLES
   ======================================== */

.calc-section {
    padding: 6rem 0;
    position: relative;
}

.calc-section-light {
    background: var(--calc-bg-light);
    color: var(--calc-text-dark);
}

.calc-section-dark {
    background: linear-gradient(180deg, var(--calc-bg-dark) 0%, var(--calc-bg-dark-alt) 100%);
    color: var(--calc-text-light);
}

/* Section Header */
.calc-section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-chapter {
    display: inline-block;
    font-family: var(--calc-font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--calc-accent);
    margin-bottom: 1rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--calc-accent);
    border-radius: 4px;
}

.calc-section-title {
    font-family: var(--calc-font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: 1rem;
}

.calc-section-light .calc-section-title {
    color: var(--calc-text-dark);
}

.calc-section-dark .calc-section-title {
    color: var(--calc-text-light);
}

.calc-section-lead {
    font-family: var(--calc-font-body);
    font-size: 1.1rem;
    opacity: 0.7;
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .calc-section-dark .calc-section-lead {
        opacity: 0.85;
    }
    
    .calc-section-light .calc-section-lead {
        opacity: 0.75;
    }
}

/* ========================================
   METADATA STRIP
   ======================================== */

.calc-metadata-strip {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: #fff;
    border-radius: var(--calc-radius);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    margin-bottom: 2rem;
}

.calc-metadata-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--calc-bg-parchment);
    border-radius: 50px;
    border: 1px solid rgba(212, 160, 23, 0.15);
    transition: all 0.3s ease;
}

.calc-metadata-item:hover {
    border-color: var(--calc-accent);
    box-shadow: 0 2px 12px rgba(212, 160, 23, 0.15);
}

.calc-metadata-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--calc-accent) 0%, var(--calc-accent-dark) 100%);
    color: #fff;
    border-radius: 50%;
    flex-shrink: 0;
}

.calc-metadata-icon i {
    font-size: 0.85rem;
}

.calc-metadata-info {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.calc-metadata-label {
    font-family: var(--calc-font-body);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--calc-text-muted);
}

.calc-metadata-value {
    font-family: var(--calc-font-body);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--calc-text-dark);
}

/* ========================================
   AUTHOR PANEL
   ======================================== */

.calc-author-panel {
    background: #fff;
    border-radius: var(--calc-radius);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    padding: 2rem;
    margin-bottom: 2rem;
    border-left: 4px solid var(--calc-accent);
    position: relative;
    overflow: hidden;
}

.calc-author-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(212, 160, 23, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.calc-author-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.calc-author-avatar {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--calc-accent) 0%, var(--calc-accent-dark) 100%);
    color: #fff;
    border-radius: 50%;
    font-family: var(--calc-font-display);
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.calc-author-info h4 {
    font-family: var(--calc-font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--calc-text-dark);
    margin: 0 0 0.25rem 0;
}

.calc-author-info p {
    font-family: var(--calc-font-body);
    font-size: 0.85rem;
    color: var(--calc-text-muted);
    margin: 0;
}

/* ========================================
   DESCRIPTION CONTENT
   ======================================== */

.calc-description-content {
    background: #fff;
    border-radius: var(--calc-radius);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    padding: 2rem;
    margin-bottom: 2rem;
}

.calc-description-content h4 {
    font-family: var(--calc-font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--calc-accent-dark);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calc-description-content h4 i {
    color: var(--calc-accent);
}

.calc-description-text {
    font-family: var(--calc-font-body);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--calc-text-dark);
}

/* ========================================
   REFERENCE PANEL
   ======================================== */

.calc-reference-panel {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--calc-radius);
    overflow: hidden;
}

.calc-reference-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    background: rgba(212, 160, 23, 0.1);
    border-bottom: 1px solid rgba(212, 160, 23, 0.2);
}

.calc-reference-header i {
    font-size: 1.25rem;
    color: var(--calc-accent);
}

.calc-reference-header h3 {
    font-family: var(--calc-font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--calc-text-light);
    margin: 0;
}

.calc-reference-content {
    padding: 2rem 2.5rem;
    font-family: var(--calc-font-body);
    font-size: 0.95rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.8);
}

.calc-reference-content h3 {
    font-family: var(--calc-font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--calc-accent-light);
    margin: 2rem 0 1rem 0;
    padding-left: 0;
    line-height: 1.4;
}

.calc-reference-content h3:first-child {
    margin-top: 0;
}

.calc-reference-content ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 1rem;
}

@media (min-width: 1200px) {
    .calc-reference-content ul {
        grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    }
}

.calc-reference-content p {
    margin: 0 0 1rem 0;
    padding-left: 0;
    line-height: 1.8;
}

.calc-reference-content > *:last-child {
    margin-bottom: 0;
}

.calc-reference-content li {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 6px;
    border-left: 3px solid var(--calc-accent);
    transition: all 0.2s ease;
}

.calc-reference-content li:hover {
    background: rgba(212, 160, 23, 0.1);
}

.calc-reference-content li::before {
    content: '\f0da';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    color: var(--calc-accent);
    font-size: 0.75rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
    line-height: 1.5;
}

.calc-reference-content li strong,
.calc-reference-content li b {
    display: inline;
    font-weight: 700;
    color: var(--calc-accent-light);
    margin-right: 0.25rem;
}

.calc-reference-content li {
    flex-direction: row;
}

/* ========================================
   FEATURE CARDS
   ======================================== */

.calc-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.calc-feature-card {
    background: #fff;
    border-radius: var(--calc-radius);
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.calc-feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.calc-feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 160, 23, 0.1);
    color: var(--calc-accent);
    border-radius: var(--calc-radius);
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
}

.calc-feature-card h4 {
    font-family: var(--calc-font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--calc-text-dark);
    margin-bottom: 0.75rem;
}

.calc-feature-card p {
    font-family: var(--calc-font-body);
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--calc-text-muted);
    margin: 0;
}

.calc-feature-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.calc-feature-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-family: var(--calc-font-body);
    font-size: 0.9rem;
    color: var(--calc-text-dark);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.calc-feature-card li i {
    color: var(--calc-accent);
    margin-top: 0.25rem;
}

/* ========================================
   FOOTER CTA
   ======================================== */

.calc-footer-cta {
    padding: 5rem 0;
    background: linear-gradient(180deg, var(--calc-bg-dark) 0%, #0a0808 100%);
}

.calc-footer-cta h3 {
    font-family: var(--calc-font-display);
    font-size: 2rem;
    color: var(--calc-text-light);
    margin-bottom: 0.75rem;
}

.calc-footer-cta p {
    font-family: var(--calc-font-body);
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 2rem;
}

.calc-footer-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ========================================
   MOBILE BOTTOM NAVIGATION
   ======================================== */

.calc-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-around;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid rgba(212, 160, 23, 0.2);
    padding: 0.5rem 0;
    padding-bottom: calc(0.5rem + env(safe-area-inset-bottom));
}

.calc-bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-family: var(--calc-font-body);
    font-size: 0.65rem;
    transition: all 0.2s ease;
    min-height: 44px;
    justify-content: center;
}

.calc-bottom-nav-item i {
    font-size: 1.1rem;
}

.calc-bottom-nav-item.active,
.calc-bottom-nav-item:hover {
    color: var(--calc-accent);
}

.calc-bottom-nav-item.active {
    transform: translateY(-2px);
}

/* ========================================
   ANIMATIONS
   ======================================== */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   EXTERNAL LINKS
   ======================================== */

.calc-external-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.calc-external-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: 1px solid var(--calc-border-light);
    border-radius: 30px;
    font-family: var(--calc-font-body);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--calc-text-dark);
    text-decoration: none;
    transition: all 0.3s ease;
}

.calc-external-btn:hover {
    background: var(--calc-accent);
    border-color: var(--calc-accent);
    color: var(--calc-text-dark);
    text-decoration: none;
}

.calc-external-btn i {
    color: var(--calc-accent);
    transition: color 0.3s ease;
}

.calc-external-btn:hover i {
    color: var(--calc-text-dark);
}

/* ========================================
   RESPONSIVE ADJUSTMENTS
   ======================================== */

@media (max-width: 992px) {
    .calc-section {
        padding: 4rem 0;
    }
    
    .calc-section-header {
        margin-bottom: 3rem;
    }
}

@media (max-width: 768px) {
    .calc-hero {
        min-height: auto;
        padding: 4rem 1rem 5rem;
    }
    
    .calc-hero-content {
        padding: 1rem;
    }
    
    .calc-hero-badge {
        font-size: 0.75rem;
        padding: 0.4rem 1rem;
        margin-bottom: 1.25rem;
    }
    
    .calc-hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .calc-hero-stats {
        gap: 1rem;
        margin-bottom: 2rem;
    }
    
    .calc-stat {
        min-width: 80px;
    }
    
    .calc-stat-value {
        font-size: 1.3rem;
    }
    
    .calc-stat-label {
        font-size: 0.7rem;
        color: rgba(255, 255, 255, 0.65);
    }
    
    .calc-scroll-indicator {
        bottom: 2rem;
        font-size: 0.75rem;
        color: rgba(255, 255, 255, 0.7);
    }
    
    .calc-section {
        padding: 3rem 0;
    }
    
    .calc-section-header {
        margin-bottom: 2rem;
        padding: 0 1rem;
    }
    
    .section-chapter {
        font-size: 0.7rem;
        padding: 0.4rem 0.875rem;
    }
    
    .calc-section-title {
        font-size: 1.75rem;
    }
    
    .calc-section-lead {
        font-size: 1rem;
        padding: 0 1rem;
    }
    
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    /* Metadata Strip - Mobile */
    .calc-metadata-strip {
        flex-direction: column;
        padding: 1.25rem;
        gap: 0.875rem;
        margin-bottom: 1.5rem;
    }
    
    .calc-metadata-item {
        padding: 0.75rem 1rem;
        width: 100%;
        justify-content: flex-start;
    }
    
    .calc-metadata-icon {
        width: 32px;
        height: 32px;
    }
    
    .calc-metadata-icon i {
        font-size: 0.75rem;
    }
    
    .calc-metadata-label {
        font-size: 0.6rem;
    }
    
    .calc-metadata-value {
        font-size: 0.8rem;
    }
    
    /* Author Panel - Mobile */
    .calc-author-panel {
        padding: 1.25rem;
        margin-bottom: 1.5rem;
    }
    
    .calc-author-avatar {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .calc-author-info h4 {
        font-size: 1.1rem;
    }
    
    /* Description Content - Mobile */
    .calc-description-content {
        padding: 1.25rem;
    }
    
    .calc-description-content h4 {
        font-size: 1.1rem;
    }
    
    .calc-description-text {
        font-size: 0.95rem;
    }
    
    /* Reference Panel - Mobile */
    .calc-reference-content {
        padding: 1.5rem 1.75rem;
    }
    
    .calc-reference-content h3 {
        font-size: 1.35rem;
        margin: 1.5rem 0 0.875rem 0;
    }
    
    .calc-reference-content ul {
        grid-template-columns: 1fr;
        margin-bottom: 1.25rem;
    }
    
    .calc-reference-content li {
        padding: 0.875rem 1rem;
    }
    
    /* Features Grid - Mobile */
    .calc-features-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    
    .calc-feature-card {
        padding: 1.5rem;
    }
    
    .calc-feature-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
    
    .calc-feature-card h4 {
        font-size: 1.1rem;
    }
    
    /* External Links - Mobile */
    .calc-external-links {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .calc-external-btn {
        justify-content: center;
        padding: 0.875rem 1.5rem;
        font-size: 0.875rem;
    }
    
    /* Footer CTA - Mobile */
    .calc-footer-cta {
        padding: 3rem 1rem;
    }
    
    .calc-footer-cta h3 {
        font-size: 1.5rem;
    }
    
    .calc-footer-cta p {
        font-size: 1rem;
        color: rgba(255, 255, 255, 0.8);
    }
    
    /* Bottom Nav Contrast - Mobile */
    .calc-bottom-nav-item {
        color: rgba(255, 255, 255, 0.7);
    }
    
    /* Add padding for bottom nav */
    .calc-cinematic-page {
        padding-bottom: 100px;
    }
}

@media (max-width: 576px) {
    .calc-hero {
        padding: 3.5rem 0.75rem 4.5rem;
    }
    
    .calc-hero-content {
        padding: 0.75rem;
    }
    
    .calc-hero-title {
        font-size: 1.75rem;
        line-height: 1.3;
        margin-bottom: 0.875rem;
    }
    
    .calc-hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.5;
        margin-bottom: 1.25rem;
    }
    
    .calc-hero-stats {
        gap: 0.75rem;
        margin-bottom: 1.75rem;
    }
    
    .calc-stat {
        min-width: 70px;
    }
    
    .calc-stat i {
        font-size: 1.1rem;
        margin-bottom: 0.375rem;
    }
    
    .calc-stat-value {
        font-size: 1.2rem;
    }
    
    .calc-stat-label {
        font-size: 0.65rem;
        color: rgba(255, 255, 255, 0.65);
    }
    
    .calc-hero-actions {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .calc-btn-primary,
    .calc-btn-secondary {
        width: 100%;
        justify-content: center;
        padding: 0.875rem 1.5rem;
        font-size: 0.9rem;
        min-height: 44px;
    }
    
    .calc-scroll-indicator {
        bottom: 1.5rem;
        font-size: 0.7rem;
        color: rgba(255, 255, 255, 0.7);
    }
    
    .calc-scroll-indicator i {
        font-size: 1.1rem;
    }
    
    .calc-section {
        padding: 2.5rem 0;
    }
    
    .calc-section-header {
        margin-bottom: 1.75rem;
        padding: 0 0.75rem;
    }
    
    .section-chapter {
        font-size: 0.65rem;
        padding: 0.35rem 0.75rem;
        margin-bottom: 0.875rem;
    }
    
    .calc-section-title {
        font-size: 1.6rem;
        margin-bottom: 0.875rem;
    }
    
    .calc-section-lead {
        font-size: 0.95rem;
        padding: 0 0.75rem;
    }
    
    .container {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }
    
    /* Metadata Strip - Small Mobile */
    .calc-metadata-strip {
        padding: 1rem;
        gap: 0.75rem;
    }
    
    .calc-metadata-item {
        padding: 0.625rem 0.875rem;
    }
    
    .calc-metadata-icon {
        width: 30px;
        height: 30px;
    }
    
    .calc-metadata-icon i {
        font-size: 0.7rem;
    }
    
    .calc-metadata-label {
        font-size: 0.575rem;
    }
    
    .calc-metadata-value {
        font-size: 0.75rem;
    }
    
    /* Author Panel - Small Mobile */
    .calc-author-panel {
        padding: 1rem;
    }
    
    .calc-author-avatar {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }
    
    .calc-author-info h4 {
        font-size: 1rem;
    }
    
    .calc-author-info p {
        font-size: 0.8rem;
    }
    
    /* Description Content - Small Mobile */
    .calc-description-content {
        padding: 1rem;
    }
    
    .calc-description-content h4 {
        font-size: 1rem;
    }
    
    .calc-description-text {
        font-size: 0.9rem;
    }
    
    /* Reference Panel - Small Mobile */
    .calc-reference-header {
        padding: 1rem;
    }
    
    .calc-reference-header h3 {
        font-size: 1.1rem;
    }
    
    .calc-reference-content {
        padding: 1.25rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .calc-reference-content h3 {
        font-size: 1.25rem;
        margin: 1.25rem 0 0.75rem 0;
    }
    
    .calc-reference-content ul {
        margin-bottom: 1rem;
    }
    
    .calc-reference-content li {
        padding: 0.75rem 0.875rem;
        font-size: 0.85rem;
    }
    
    /* Feature Cards - Small Mobile */
    .calc-feature-card {
        padding: 1.25rem;
    }
    
    .calc-feature-icon {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
        margin-bottom: 1rem;
    }
    
    .calc-feature-card h4 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }
    
    .calc-feature-card p {
        font-size: 0.9rem;
    }
    
    .calc-feature-card li {
        font-size: 0.85rem;
    }
    
    /* External Links - Small Mobile */
    .calc-external-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.8rem;
        min-height: 44px;
    }
    
    /* Footer CTA - Small Mobile */
    .calc-footer-cta {
        padding: 2.5rem 0.75rem;
    }
    
    .calc-footer-cta h3 {
        font-size: 1.35rem;
        margin-bottom: 0.625rem;
    }
    
    .calc-footer-cta p {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
        color: rgba(255, 255, 255, 0.8);
    }
    
    .calc-footer-actions {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .calc-footer-actions .calc-btn-primary {
        min-height: 44px;
    }
    
    /* Increase bottom padding for safe area on iPhone */
    .calc-cinematic-page {
        padding-bottom: calc(100px + env(safe-area-inset-bottom));
    }
    
    .calc-bottom-nav {
        padding-bottom: calc(0.5rem + env(safe-area-inset-bottom));
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .calc-page-nav,
    .calc-bottom-nav,
    .calc-scroll-indicator,
    .calc-hero-actions,
    .calc-external-links,
    .calc-footer-cta,
    .skip-link {
        display: none !important;
    }
    
    .calc-hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .calc-section {
        padding: 2rem 0;
        page-break-inside: avoid;
    }
    
    .calc-cinematic-page {
        background: #fff;
        color: #000;
    }
    
    .calc-section-dark {
        background: #f5f5f5;
        color: #000;
    }
    
    .calc-hero-title,
    .calc-section-title {
        color: #000;
    }
}