/**
 * SciDataLogic.com - "Deep Trust" Design System & Mobile-First Component Library
 * Phase 4: Public Site Design & Layout
 * Palette: Primary Navy (#0F2A47), Secondary Teal (#17A398), Accent Amber (#F2A93B),
 *          Edu Coral (#FF6B5B), Neutral Background (#F7F9FA), Text (#1C1C1E)
 */

:root {
    /* Core Color Tokens ("Deep Trust") */
    --color-primary-navy: #0F2A47;
    --color-primary-navy-dark: #0A1C30;
    --color-primary-navy-light: #163C65;

    --color-secondary-teal: #17A398;
    --color-secondary-teal-hover: #128279;
    --color-secondary-teal-light: rgba(23, 163, 152, 0.1);

    --color-accent-amber: #F2A93B;
    --color-accent-amber-hover: #D99126;
    --color-accent-amber-light: rgba(242, 169, 59, 0.12);

    --color-accent-coral: #FF6B5B;
    --color-accent-coral-hover: #E05344;
    --color-accent-coral-light: rgba(255, 107, 91, 0.12);

    --color-bg-body: #F7F9FA;
    --color-bg-surface: #FFFFFF;
    --color-bg-muted: #EEF2F6;
    --color-bg-dark: #0F2A47;

    --color-border: #E2E8F0;
    --color-border-hover: #CBD5E1;
    --color-border-dark: #243E5E;

    --color-text-main: #1C1C1E;
    --color-text-body: #334155;
    --color-text-muted: #64748B;
    --color-text-dim: #94A3B8;
    --color-text-white: #FFFFFF;

    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-whatsapp: #25D366;
    --color-whatsapp-hover: #1EBE5D;

    /* Typography Scale */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-heading: 'Sora', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Consolas', 'Courier New', monospace;

    --type-scale-h1: clamp(2.15rem, 4.5vw, 3.25rem);
    --type-scale-h2: clamp(1.75rem, 3.2vw, 2.35rem);
    --type-scale-h3: clamp(1.35rem, 2.2vw, 1.65rem);
    --type-scale-h4: 1.25rem;
    --type-scale-body: 1rem;
    --type-scale-small: 0.875rem;
    --type-scale-caption: 0.75rem;

    /* Layout & Elevation */
    --container-max-width: 1200px;
    --header-height: 72px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(15, 42, 71, 0.06);
    --shadow-md: 0 4px 12px rgba(15, 42, 71, 0.08);
    --shadow-lg: 0 12px 30px rgba(15, 42, 71, 0.12);
    --shadow-navy: 0 15px 35px rgba(10, 28, 48, 0.35);

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--color-bg-body);
    color: var(--color-text-body);
    font-family: var(--font-sans);
    line-height: 1.65;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Accessibility: Skip Link & Visible Focus */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    background: var(--color-accent-amber);
    color: var(--color-primary-navy-dark);
    font-weight: 700;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    z-index: 9999;
    text-decoration: none;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 1rem;
}

:focus-visible {
    outline: 2px solid var(--color-secondary-teal);
    outline-offset: 3px;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-text-main);
    line-height: 1.25;
    letter-spacing: -0.02em;
    font-weight: 700;
}

h1 { font-size: var(--type-scale-h1); }
h2 { font-size: var(--type-scale-h2); }
h3 { font-size: var(--type-scale-h3); }
h4 { font-size: var(--type-scale-h4); }

p {
    margin-bottom: 1rem;
}

p:last-child {
    margin-bottom: 0;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

.site-main {
    flex: 1 0 auto;
}

/* Header & Public Navigation */
.site-header {
    background-color: var(--color-primary-navy);
    border-bottom: 1px solid var(--color-border-dark);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(10, 28, 48, 0.15);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
    color: var(--color-text-white);
}

.brand-symbol {
    font-family: var(--font-mono);
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--color-accent-amber);
    background-color: rgba(242, 169, 59, 0.15);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(242, 169, 59, 0.4);
}

.brand-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-white);
}

/* Mobile Hamburger Toggle */
.mobile-nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 2.5rem;
    height: 2.5rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    padding: 0.45rem;
    cursor: pointer;
}

.hamburger-bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-white);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-nav-toggle.is-active .hamburger-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-nav-toggle.is-active .hamburger-bar:nth-child(2) {
    opacity: 0;
}

.mobile-nav-toggle.is-active .hamburger-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Navigation Drawer */
.primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary-navy-dark);
    border-bottom: 2px solid var(--color-secondary-teal);
    padding: 1.5rem 1.25rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.primary-nav.is-open {
    display: block;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-link {
    display: block;
    color: #CBD5E1;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
    color: var(--color-text-white);
    background-color: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
    color: var(--color-accent-amber);
    font-weight: 600;
}

/* Buttons Component Library */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.6rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
    line-height: 1.2;
    text-align: center;
}

.btn-primary {
    background-color: var(--color-accent-amber);
    color: var(--color-primary-navy-dark);
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(242, 169, 59, 0.3);
}

.btn-primary:hover {
    background-color: var(--color-accent-amber-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(242, 169, 59, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-white);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--color-text-white);
    transform: translateY(-2px);
}

.btn-secondary-dark {
    background-color: var(--color-bg-surface);
    color: var(--color-primary-navy);
    border-color: var(--color-border);
}

.btn-secondary-dark:hover {
    border-color: var(--color-primary-navy);
    background-color: var(--color-bg-muted);
}

.btn-teal {
    background-color: var(--color-secondary-teal);
    color: var(--color-text-white);
}

.btn-teal:hover {
    background-color: var(--color-secondary-teal-hover);
    transform: translateY(-2px);
}

.btn-coral {
    background-color: var(--color-accent-coral);
    color: var(--color-text-white);
}

.btn-coral:hover {
    background-color: var(--color-accent-coral-hover);
    transform: translateY(-2px);
}

.btn-whatsapp {
    background-color: var(--color-whatsapp);
    color: var(--color-text-white);
    font-weight: 700;
}

.btn-whatsapp:hover {
    background-color: var(--color-whatsapp-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 211, 102, 0.35);
}

.btn-sm {
    padding: 0.45rem 0.95rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.05rem;
}

/* Hero Section */
.hero-public {
    background: radial-gradient(circle at 50% 15%, #163C65 0%, var(--color-primary-navy) 70%);
    color: var(--color-text-white);
    padding: 4.5rem 0 4rem;
    text-align: center;
    border-bottom: 1px solid var(--color-border-dark);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    background-color: rgba(242, 169, 59, 0.15);
    border: 1px solid rgba(242, 169, 59, 0.4);
    color: var(--color-accent-amber);
    font-size: 0.8125rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background-color: var(--color-accent-amber);
}

.hero-title {
    color: var(--color-text-white);
    margin-bottom: 1.25rem;
    max-width: 920px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    color: #CBD5E1;
    font-size: clamp(1.05rem, 2.2vw, 1.25rem);
    max-width: 720px;
    margin: 0 auto 2.25rem;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    justify-content: center;
    max-width: 440px;
    margin: 0 auto;
}

/* Sections & Vertical Rhythm */
.section {
    padding: 4.5rem 0;
}

.section-muted {
    background-color: var(--color-bg-muted);
}

.section-navy {
    background-color: var(--color-primary-navy);
    color: var(--color-text-white);
}

.section-navy h2, .section-navy h3, .section-navy h4 {
    color: var(--color-text-white);
}

.section-navy p {
    color: #CBD5E1;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 3rem;
}

.section-kicker {
    display: inline-block;
    color: var(--color-secondary-teal);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

.section-navy .section-kicker {
    color: var(--color-accent-amber);
}

.section-title {
    font-size: var(--type-scale-h2);
    margin-bottom: 0.75rem;
}

.section-desc {
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

/* Component: "Who We Help" Strip */
.trust-strip {
    background-color: var(--color-bg-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 2rem 0;
}

.trust-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    align-items: center;
}

.trust-item {
    display: flex;
    align-items: flex-start;
    gap: 0.875rem;
}

.trust-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background-color: var(--color-secondary-teal-light);
    color: var(--color-secondary-teal);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.trust-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-text-main);
    margin-bottom: 0.2rem;
}

.trust-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.45;
}

/* Component: Service Cards Grid */
.service-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
}

.card-service {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.card-service:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-secondary-teal);
}

.card-service-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.25rem;
}

.service-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: rgba(15, 42, 71, 0.06);
    color: var(--color-primary-navy);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.service-badge {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-full);
    background-color: var(--color-secondary-teal-light);
    color: var(--color-secondary-teal);
    border: 1px solid rgba(23, 163, 152, 0.2);
}

.card-service.edu-card .service-badge {
    background-color: var(--color-accent-coral-light);
    color: var(--color-accent-coral);
    border-color: rgba(255, 107, 91, 0.3);
}

.card-service.edu-card .service-icon {
    color: var(--color-accent-coral);
    background-color: var(--color-accent-coral-light);
}

.service-title {
    font-size: 1.35rem;
    margin-bottom: 0.65rem;
}

.service-pitch {
    color: var(--color-text-body);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
    line-height: 1.55;
}

.service-deliverables {
    margin-top: auto;
    border-top: 1px solid var(--color-border);
    padding-top: 1.25rem;
}

.deliverables-title {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.65rem;
}

.deliverables-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.deliverables-list li {
    font-size: 0.875rem;
    color: var(--color-text-body);
    padding-left: 1.25rem;
    position: relative;
}

.deliverables-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-secondary-teal);
    font-weight: 700;
}

/* Component: 4-Step Process Layout */
.process-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.card-process {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.process-step-num {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--color-secondary-teal);
    opacity: 0.35;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.process-step-title {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

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

/* Component: Case Study Cards */
.case-study-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
}

.card-case-study {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2.25rem 2rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.case-client-tag {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-secondary-teal);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.case-headline {
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.case-metric-box {
    background-color: rgba(15, 42, 71, 0.04);
    border-left: 3px solid var(--color-accent-amber);
    padding: 0.875rem 1rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 1.25rem;
}

.case-metric-val {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary-navy);
}

.case-metric-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Component: CTA Banner Block */
.cta-banner {
    background: linear-gradient(135deg, var(--color-primary-navy) 0%, #163C65 100%);
    border-radius: var(--radius-lg);
    padding: 3.5rem 2rem;
    text-align: center;
    color: var(--color-text-white);
    box-shadow: var(--shadow-navy);
}

.cta-banner-title {
    color: var(--color-text-white);
    margin-bottom: 1rem;
    font-size: clamp(1.75rem, 3.5vw, 2.35rem);
}

.cta-banner-desc {
    color: #CBD5E1;
    font-size: 1.1rem;
    max-width: 680px;
    margin: 0 auto 2rem;
}

/* Forms & Input Elements */
.form-card {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-md);
    max-width: 760px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.35rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    background-color: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    color: var(--color-text-main);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Alert Notification Boxes */
.alert {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--color-success);
    color: #065F46;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--color-danger);
    color: #991B1B;
}

/* Error Pages Styling (Branded 404/500) */
.error-hero {
    padding: 5rem 0;
    text-align: center;
}

.error-box {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3.5rem 2rem;
    max-width: 580px;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
}

.error-code {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    color: var(--color-primary-navy);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.error-title {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.error-desc {
    color: var(--color-text-muted);
    font-size: 1rem;
    margin-bottom: 2rem;
}

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

/* Public Footer */
.site-footer {
    background-color: var(--color-primary-navy-dark);
    color: #CBD5E1;
    border-top: 1px solid var(--color-border-dark);
    padding: 4rem 0 2rem;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    margin-bottom: 3.5rem;
}

.footer-brand-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-white);
    margin-bottom: 0.75rem;
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.6;
    color: #94A3B8;
}

.footer-heading {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-white);
    margin-bottom: 1.15rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.footer-links a {
    color: #94A3B8;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-links a:focus {
    color: var(--color-accent-amber);
}

.footer-bottom {
    border-top: 1px solid var(--color-border-dark);
    padding-top: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
    text-align: center;
    font-size: 0.85rem;
    color: #64748B;
}

/* Responsive Desktop Enhancements (768px and up) */
@media (min-width: 768px) {
    .mobile-nav-toggle {
        display: none;
    }

    .primary-nav {
        display: block;
        position: static;
        background: transparent;
        border: none;
        padding: 0;
        box-shadow: none;
    }

    .nav-list {
        flex-direction: row;
        align-items: center;
        gap: 1.25rem;
    }

    .hero-actions {
        flex-direction: row;
        max-width: none;
    }

    .trust-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .case-study-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1.5fr;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* Large Desktop Enhancements (1024px and up) */
@media (min-width: 1024px) {
    .service-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .process-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .case-study-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}