/* Arbiter Healthcare - Main Stylesheet */

/* CSS Custom Properties - Brand Colors */
:root {
    /* Primary */
    --blue-500: #2563EB;
    --blue-600: #1D4ED8;
    --blue-400: #60A5FA;
    --blue-200: #DBEAFE;
    --blue-50: #EFF6FF;

    /* Neutrals */
    --gray-900: #111827;
    --gray-700: #374151;
    --gray-500: #6B7280;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-50: #F9FAFB;
    --white: #FFFFFF;

    /* Semantic */
    --success: #22C55E;
    --success-light: #DCFCE7;
    --error: #EF4444;
    --error-light: #FEE2E2;
    --warning: #F59E0B;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-logo: 'Helvetica Neue', Helvetica, Arial, sans-serif;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Layout */
    --header-height: 72px;
    --max-width: 1200px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--gray-900);
    font-weight: 600;
    line-height: 1.3;
}

h1 {
    font-size: 2.25rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.75rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
}

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

a {
    color: var(--blue-500);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--blue-600);
}

ul, ol {
    list-style: none;
}

/* Utility Classes */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-3xl) 0;
}

.section-header {
    margin-bottom: var(--space-xl);
}

.section-title {
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    color: var(--gray-500);
    font-size: 1.125rem;
}

.section-subtitle-spaced {
    margin-bottom: var(--space-lg);
}

/* ========================================
   HEADER / NAVIGATION
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
}

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

.logo {
    font-family: var(--font-logo);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}

.logo:hover {
    color: var(--gray-900);
}

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

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--gray-700);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: var(--space-sm) 0;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--gray-900);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--blue-500);
}

/* Mobile Menu Button */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-900);
    transition: all 0.3s ease;
    position: absolute;
}

.menu-toggle span:first-child {
    transform: translateY(-6px);
}

.menu-toggle span:last-child {
    transform: translateY(6px);
}

.menu-toggle.active span:first-child {
    transform: rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:last-child {
    transform: rotate(-45deg);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--blue-500);
    border-color: var(--blue-500);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--blue-600);
    border-color: var(--blue-600);
    color: var(--white);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    color: var(--gray-900);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* ========================================
   CARDS
   ======================================== */
.card {
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    padding: var(--space-lg);
}

.card-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.card-text {
    color: var(--gray-500);
    font-size: 0.9375rem;
}


/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    padding-top: calc(var(--header-height) + var(--space-3xl));
    padding-bottom: var(--space-3xl);
    background: var(--white);
}

.hero-content {
    max-width: 640px;
}

.hero-tagline {
    color: var(--blue-500);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: 2.75rem;
    line-height: 1.15;
    margin-bottom: var(--space-lg);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-500);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* Hero with graphic */
.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.hero-graphic {
    position: relative;
    display: none;
}

/* ========================================
   SOLUTION / FEATURES SECTION
   ======================================== */
.features {
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

.feature-item {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.feature-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--blue-500);
    margin-top: 2px;
}

.feature-content h3 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
}

.feature-content p {
    color: var(--gray-500);
    font-size: 0.9375rem;
    margin: 0;
}

/* ========================================
   USE CASES SECTION (Horizontal Rows)
   ======================================== */
.use-cases-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.use-case-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
}

.use-case-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    color: var(--blue-500);
}

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

.use-case-content {
    flex: 1;
    min-width: 0;
}

.use-case-title {
    font-weight: 600;
    color: var(--gray-900);
    margin-right: var(--space-sm);
}

.use-case-desc {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

.use-case-audience {
    flex-shrink: 0;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--blue-600);
    background: var(--blue-50);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

/* ========================================
   PROCESS / TIMELINE SECTION
   ======================================== */
.process {
    background: var(--white);
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 40px;
    bottom: 40px;
    width: 2px;
    background: var(--gray-200);
}

.timeline-item {
    display: flex;
    gap: var(--space-lg);
    position: relative;
}

.timeline-marker {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--blue-500);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    z-index: 1;
}

.timeline-content {
    flex: 1;
    padding-bottom: var(--space-lg);
}

.timeline-phase {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--blue-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.timeline-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.timeline-description {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

.timeline-description ul {
    margin-top: var(--space-sm);
    padding-left: var(--space-lg);
    list-style: disc;
}

.timeline-description li {
    margin-bottom: var(--space-xs);
}

/* ========================================
   OUTCOMES SECTION
   ======================================== */
.outcomes {
    background: var(--gray-50);
}

.outcomes-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.outcome-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.outcome-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    color: var(--success);
}

.outcome-text {
    font-weight: 500;
    color: var(--gray-900);
}

/* ========================================
   SERVICES SECTION
   ======================================== */
.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

.service-card {
    padding: var(--space-xl);
    border-left: 3px solid var(--blue-500);
}

.service-card .card-title {
    color: var(--gray-900);
}

/* ========================================
   CTA SECTION
   ======================================== */
.cta-section {
    background: var(--gray-900);
    color: var(--white);
}

.cta-section .section-title {
    color: var(--white);
}

.cta-section .section-subtitle {
    color: var(--gray-300);
    margin-bottom: var(--space-xl);
}

/* ========================================
   CONTACT FORM
   ======================================== */
.contact-section {
    background: var(--gray-50);
    padding-top: calc(var(--header-height) + var(--space-3xl));
}

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

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

.contact-info p {
    color: var(--gray-500);
    font-size: 1.0625rem;
}

.contact-form {
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    padding: var(--space-xl);
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    color: var(--gray-900);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px var(--blue-50);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--gray-400);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

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

.form-checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--blue-500);
    cursor: pointer;
}

.form-checkbox span {
    font-size: 0.875rem;
    color: var(--gray-700);
}

/* Form validation error state */
.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--error);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
    box-shadow: 0 0 0 3px var(--error-light);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--white);
    border-top: 1px solid var(--gray-200);
    padding: var(--space-xl) 0;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    text-align: center;
}

.footer-logo {
    font-family: var(--font-logo);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}


.footer-copyright {
    color: var(--gray-400);
    font-size: 0.8125rem;
}

/* ========================================
   DASHBOARD GRAPHIC (SVG)
   ======================================== */
.dashboard-graphic {
    background: var(--blue-600);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
}

.dashboard-graphic svg {
    width: 100%;
    height: auto;
}


/* Secondary graphic (about page) - constrain on mobile */
.graphic-secondary {
    max-width: 320px;
    margin: 0 auto;
}

.graphic-secondary .dashboard-graphic {
    padding: var(--space-md);
}

/* ========================================
   SCROLL ANIMATIONS
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   RESPONSIVE - TABLET (768px+)
   ======================================== */
@media (min-width: 768px) {
    h1 {
        font-size: 2.75rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 3.25rem;
    }

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

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

    .outcomes-list {
        grid-template-columns: 1fr 1fr 1fr;
    }

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

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

    .footer-inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .timeline {
        flex-direction: row;
        gap: var(--space-md);
    }

    .timeline::before {
        left: 0;
        right: 0;
        top: 20px;
        bottom: auto;
        width: auto;
        height: 2px;
    }

    .timeline-item {
        flex-direction: column;
        flex: 1;
        text-align: center;
    }

    .timeline-marker {
        margin: 0 auto var(--space-md);
    }

    .timeline-content {
        padding-bottom: 0;
    }

    .timeline-description ul {
        display: none;
    }

    .hero-graphic {
        display: block;
        max-width: 100%;
    }

    .graphic-secondary {
        max-width: 100%;
    }
}

/* ========================================
   RESPONSIVE - DESKTOP (1024px+)
   ======================================== */
@media (min-width: 1024px) {
    .hero-title {
        font-size: 3.5rem;
    }

    .form-checkbox-group {
        gap: var(--space-lg);
    }
}

/* ========================================
   RESPONSIVE - MOBILE (<768px)
   ======================================== */
@media (max-width: 767px) {
    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        padding: var(--space-lg);
        flex-direction: column;
        gap: var(--space-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: var(--space-sm) 0;
    }

    .nav .btn {
        width: 100%;
    }

    .hero {
        padding-top: calc(var(--header-height) + var(--space-xl));
    }

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

    .hero-cta .btn {
        width: 100%;
    }

    .contact-form {
        padding: var(--space-lg);
    }

    .use-case-row {
        flex-wrap: wrap;
        gap: var(--space-sm);
    }

    .use-case-icon {
        width: 28px;
        height: 28px;
    }

    .use-case-content {
        flex: 1 1 calc(100% - 44px);
    }

    .use-case-audience {
        margin-left: 44px;
        margin-top: 0;
    }
}