/* 
 * Sanders Data Services - Main Stylesheet
 * Design: Refined professional with subtle warmth
 */

/* ==================== CSS Variables ==================== */
:root {
    /* Color Palette - Deep teal/slate professional scheme */
    --color-primary: #1a5f5a;
    --color-primary-dark: #134845;
    --color-primary-light: #e8f4f3;
    --color-accent: #c9a227;
    --color-accent-light: #f5efd6;
    
    --color-text: #2d3748;
    --color-text-light: #5a6a7a;
    --color-text-inverse: #ffffff;
    
    --color-bg: #fafbfc;
    --color-bg-warm: #f8f7f4;
    --color-bg-dark: #1e2a32;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    
    /* Typography */
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    
    /* Effects */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h3 { font-size: 1.4rem; }

h1 em, h2 em {
    font-style: italic;
    color: var(--color-primary);
}

/* ==================== Layout Utilities ==================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ==================== Header & Navigation ==================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--color-text);
}

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

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-light);
    padding: var(--space-xs) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition);
}

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* ==================== Hero Section ==================== */
.hero {
    min-height: 85vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--space-xl);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--header-height) + var(--space-xl)) var(--space-md) var(--space-xl);
}

.hero-tagline {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.hero h1 {
    margin-bottom: var(--space-md);
}

.hero-description {
    font-size: 1.15rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* Data Flow Graphic */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.data-flow-graphic {
    display: flex;
    align-items: center;
    gap: 0;
}

.flow-node {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
    animation: pulse 3s ease-in-out infinite;
    text-align: center;
    padding: 15px;
    box-sizing: border-box;
}

.node-label {
    display: block;
    line-height: 1.2;
    margin-bottom: 4px;
}

.node-sublabel {
    font-size: 0.6rem;
    font-weight: 400;
    opacity: 0.75;
    display: block;
    line-height: 1.2;
}

.node-1 {
    background: var(--color-primary-light);
    color: var(--color-primary);
    animation-delay: 0s;
}

.node-2 {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    animation-delay: 0.5s;
    box-shadow: 0 0 0 4px var(--color-primary-dark), 0 4px 20px rgba(26, 95, 90, 0.3);
}

.node-2 .node-label {
    font-size: 1rem;
    letter-spacing: 0.05em;
}

.node-3 {
    background: var(--color-accent-light);
    color: var(--color-accent);
    animation-delay: 1s;
}

.flow-line {
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary));
    position: relative;
    flex-shrink: 0;
}

.flow-line::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    border: 6px solid transparent;
    border-left-color: var(--color-primary);
}

.line-2 {
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent-light));
}

.line-2::after {
    border-left-color: var(--color-accent);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-large {
    padding: 1rem 2.25rem;
    font-size: 1.05rem;
}

.text-link {
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.text-link:hover {
    gap: var(--space-sm);
}

/* ==================== Value Props Section ==================== */
.value-props {
    padding: var(--space-2xl) 0;
    background: var(--color-surface);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.value-card {
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.value-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.value-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.value-icon svg {
    width: 100%;
    height: 100%;
}

.value-card h3 {
    margin-bottom: var(--space-sm);
}

.value-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ==================== Experience Section ==================== */
.experience-highlight {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-warm);
}

.experience-highlight .container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.experience-content h2 {
    margin-bottom: var(--space-md);
}

.experience-content p {
    margin-bottom: var(--space-md);
    color: var(--color-text-light);
}

.experience-stats {
    display: grid;
    gap: var(--space-md);
}

.stat {
    background: var(--color-surface);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==================== CTA Section ==================== */
.cta-section {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-dark);
    text-align: center;
}

.cta-section h2 {
    color: var(--color-text-inverse);
    margin-bottom: var(--space-sm);
}

.cta-section p {
    color: rgba(255,255,255,0.7);
    max-width: 540px;
    margin: 0 auto var(--space-lg);
}

/* ==================== Footer ==================== */
.site-footer {
    background: var(--color-bg-dark);
    padding: var(--space-xl) 0 var(--space-md);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: var(--space-md);
}

.footer-brand .logo-text {
    color: var(--color-text-inverse);
    display: block;
    margin-bottom: var(--space-xs);
}

.footer-brand p {
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}

.footer-nav {
    display: flex;
    gap: var(--space-lg);
}

.footer-nav a {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}

.footer-nav a:hover {
    color: var(--color-text-inverse);
}

.footer-bottom p {
    color: rgba(255,255,255,0.4);
    font-size: 0.85rem;
}

/* ==================== Page-Specific Styles ==================== */

/* Services Page */
.page-header {
    padding: calc(var(--header-height) + var(--space-xl)) 0 var(--space-xl);
    background: var(--color-bg-warm);
    text-align: center;
}

.page-header h1 {
    margin-bottom: var(--space-sm);
}

.page-header .lead {
    font-size: 1.15rem;
    color: var(--color-text-light);
    max-width: 640px;
    margin: 0 auto;
}

.services-detail {
    padding: var(--space-2xl) 0;
}

.service-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.service-block:last-child {
    border-bottom: none;
}

.service-block:nth-child(even) {
    direction: rtl;
}

.service-block:nth-child(even) > * {
    direction: ltr;
}

.service-number {
    font-family: var(--font-display);
    font-size: 4rem;
    color: var(--color-primary-light);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.service-block h2 {
    margin-bottom: var(--space-md);
}

.service-block p {
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.service-visual {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.service-icon-large {
    width: 120px;
    height: 120px;
    color: var(--color-primary);
    opacity: 0.3;
}

/* About Page */
.about-intro {
    padding: var(--space-2xl) 0;
}

.about-intro .container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
}

.about-content p {
    margin-bottom: var(--space-md);
    color: var(--color-text-light);
}

.about-content p:first-of-type {
    font-size: 1.15rem;
    color: var(--color-text);
}

.about-sidebar {
    background: var(--color-bg-warm);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    height: fit-content;
}

.about-sidebar h3 {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-primary);
}

.about-sidebar ul {
    list-style: none;
}

.about-sidebar li {
    padding: var(--space-xs) 0;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.timeline {
    padding: var(--space-2xl) 0;
    background: var(--color-surface);
}

.timeline h2 {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.timeline-items {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--space-lg);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child {
    border-bottom: none;
}

.timeline-year {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-primary);
}

.timeline-item h3 {
    margin-bottom: var(--space-xs);
}

.timeline-item p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Contact Page */
.contact-section {
    padding: var(--space-2xl) 0;
}

.contact-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.contact-info h2 {
    margin-bottom: var(--space-md);
}

.contact-info > p {
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
}

.contact-method {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-top: 1px solid var(--color-border);
}

.contact-method:last-child {
    border-bottom: 1px solid var(--color-border);
}

.contact-method-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-method h3 {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

.contact-method p,
.contact-method a {
    font-size: 1.1rem;
}

.contact-form-wrapper {
    background: var(--color-bg-warm);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
}

.contact-form-wrapper h3 {
    margin-bottom: var(--space-md);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* ==================== Capabilities Section ==================== */
.capabilities-section {
    padding: var(--space-2xl) 0;
    background: var(--color-surface);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.capability-item {
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.capability-item h4 {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.capability-item p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin: 0;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--space-lg));
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: var(--space-lg);
    }
    
    .data-flow-graphic {
        transform: scale(0.85);
    }
    
    .value-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .experience-highlight .container {
        grid-template-columns: 1fr;
    }
    
    .experience-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .service-block,
    .service-block:nth-child(even) {
        grid-template-columns: 1fr;
        direction: ltr;
    }
    
    .service-visual {
        order: -1;
        min-height: 200px;
    }
    
    .about-intro .container {
        grid-template-columns: 1fr;
    }
    
    .about-sidebar {
        order: -1;
    }
    
    .contact-section .container {
        grid-template-columns: 1fr;
    }
    
    .capabilities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 3rem;
        --space-2xl: 4rem;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: var(--space-md);
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links li {
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-links li:last-child {
        border-bottom: none;
    }
    
    .nav-links a {
        display: block;
        padding: var(--space-sm) 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .experience-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .footer-nav {
        flex-wrap: wrap;
        gap: var(--space-md);
    }
    
    .timeline-item {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .capabilities-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        width: 100%;
    }
    
    .data-flow-graphic {
        flex-direction: column;
        transform: scale(0.75);
    }
    
    .flow-line {
        width: 3px;
        height: 40px;
    }
    
    .flow-line::after {
        right: 50%;
        top: auto;
        bottom: -6px;
        transform: translateX(50%) rotate(90deg);
    }
}