/* 
 * Brand Strategy Planning Service - Core Tokens & Styles
 * Approach: Architectural Precision
 */

:root {
    /* Colors */
    --color-primary: #1A1A1A;     /* Deep Obsidian */
    --color-accent: #2E5BFF;      /* Electric Cobalt */
    --color-secondary: #708090;   /* Slate Grey */
    --color-bg: #FDFDFD;          /* Soft Ivory */
    --color-text: #333333;
    --color-text-light: #666666;
    --color-white: #FFFFFF;
    
    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--color-primary);
    font-weight: 700;
}

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

ul {
    list-style: none;
}

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

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(253, 253, 253, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--color-primary);
}

.logo span {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
}

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

.mobile-menu-btn {
    display: none;
    cursor: pointer;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background: var(--color-accent);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.hero-image {
    position: absolute;
    right: -10%;
    top: 50%;
    transform: translateY(-50%);
    width: 50%;
    z-index: 1;
    opacity: 0.8;
}

/* Footer */
footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.footer-info .logo {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-info p {
    color: rgba(255, 255, 255, 0.6);
}

.footer-links h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-links ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.6);
}

.footer-links ul li a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* Responsive */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 3.5rem;
    }
    .hero-image {
        display: none;
    }
    .hero-content {
        max-width: 100%;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-container {
        position: relative;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-md);
        background: rgba(253, 253, 253, 0.98);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
    }
    .nav-links a {
        display: block;
    }
    .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 6px;
        width: 44px;
        height: 44px;
        padding: 0;
        border: 0;
        background: transparent;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    section {
        padding: var(--spacing-lg) 0;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
}