/* Core Variables */
:root {
    --color-bg-white: #FFFFFF;
    --color-bg-grey: #F7F9FC; /* Light Clinical Grey */
    --color-text-main: #1C1C1E; /* Apple-grade Charcoal */
    --color-text-muted: #6B6B6D;
    --color-divider: #A0A0A0; /* Thin Silver */
    
    /* Dual Accents */
    --color-supply: #85B09A; /* Cambridge Blue */
    --color-supply-hover: #6D9680;
    --color-demand: #0074D9; /* Electric Blue */
    --color-demand-hover: #005bb5;
    
    /* Cross-Link Background */
    --color-navy: #0A2540;
    
    --font-primary: 'Avenir Next', 'Inter', sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-white);
    color: var(--color-text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

/* Header & Nav */
.global-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-divider);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text-main);
    letter-spacing: -0.02em;
}

.main-nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-main);
}

.main-nav a:hover {
    color: var(--color-text-muted);
}

.btn-outline-nav {
    padding: 0.5rem 1.5rem;
    border: 1px solid var(--color-text-main);
    border-radius: 4px;
}

.btn-outline-nav:hover {
    background-color: var(--color-text-main);
    color: var(--color-bg-white) !important;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px; /* Offset for header */
    background-color: var(--color-bg-white);
}

.hero-container {
    max-width: 900px;
    margin: 0;
}

.headline {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    color: var(--color-text-main);
}

.subheadline {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 750px;
    margin-bottom: 3rem;
    font-weight: 400;
}

/* Buttons */
.hero-actions {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
}

.btn-supply {
    background-color: var(--color-supply);
    color: #FFFFFF;
}

.btn-supply:hover {
    background-color: var(--color-supply-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(133, 176, 154, 0.4);
}

.btn-demand {
    background-color: var(--color-demand);
    color: #FFFFFF;
}

.btn-demand:hover {
    background-color: var(--color-demand-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px -5px rgba(0, 116, 217, 0.4);
}

.btn-transparent-white {
    background-color: transparent;
    color: #FFFFFF;
    border: 1px solid #FFFFFF;
}

.btn-transparent-white:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Split Sections (Supply/Demand) */
.supply-section {
    padding: 8rem 0;
    background-color: var(--color-bg-grey);
}

.demand-section {
    padding: 8rem 0;
    background-color: var(--color-bg-white);
}

.split-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.split-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.split-content p {
    font-size: 1.15rem;
    color: var(--color-text-muted);
}

.split-visual {
    display: flex;
    justify-content: center;
}

.mockup-img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(28, 28, 30, 0.1);
}

.phone-mockup {
    max-width: 320px;
}

.dashboard-mockup {
    max-width: 600px;
}

/* Cross-Link Section */
.cross-link-section {
    padding: 8rem 0;
    background-color: var(--color-navy);
    color: #FFFFFF;
    text-align: center;
}

.cross-link-container h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.cross-link-container p {
    font-size: 1.15rem;
    opacity: 0.9;
    margin: 0 auto 3rem auto;
    max-width: 600px;
}

/* Footer */
.global-footer {
    padding: 4rem 0 2rem 0;
    background-color: var(--color-bg-white);
    border-top: 1px solid var(--color-divider);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
}

.footer-left p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--color-text-main);
}

.footer-bottom {
    text-align: center;
}

.disclaimer {
    font-size: 0.75rem;
    color: var(--color-divider);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.slide-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.is-visible {
    opacity: 1;
    transform: translate(0);
}

/* Responsive */
@media (max-width: 992px) {
    .split-container {
        grid-template-columns: 1fr;
        gap: 4rem;
        text-align: center;
    }
    
    .reverse-mobile .split-visual {
        order: 2;
    }
    
    .reverse-mobile .split-content {
        order: 1;
    }
    
    .dashboard-mockup {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .headline {
        font-size: 2.5rem;
    }
    
    .main-nav {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}