:root {
    --color-obsidian: #0A0A0B; /* Silk Obsidian - Refined for depth */
    --color-slate: #161617;
    --color-slate-light: #1C1C1D;
    --color-gold: #C5A059;
    --color-gold-muted: rgba(197, 160, 89, 0.6);
    --color-text-primary: #F5F5F5;
    --color-text-secondary: #A0A0A0;
    --color-border: rgba(255, 255, 255, 0.08);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    --transition-premium: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --container-max: 1200px;
    --color-error: #FF4B4B;
    --color-success: #28A745;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--color-obsidian);
    color: var(--color-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Silk Obsidian: Softened depth with subtle overlays */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 50% 0%, var(--color-slate) 0%, transparent 70%),
        radial-gradient(circle at 0% 100%, rgba(22, 22, 23, 0.5) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Subtle Verticality Layer - Premium Grain/Overlay */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noiseFilter)"/%3E%3C/svg%3E');
    opacity: 0.02;
    pointer-events: none;
    z-index: 1;
}

h1, h2, h3, h4 {
    color: var(--color-gold);
    letter-spacing: -0.02em;
    text-transform: uppercase;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 3.5rem; font-weight: 800; }
h2 { font-size: 2.5rem; font-weight: 700; }
h3 { font-size: 1.75rem; font-weight: 600; }

p {
    color: var(--color-text-secondary);
    font-size: 1.25rem;
    max-width: 65ch;
    margin-bottom: var(--spacing-md);
}

.lead {
    font-size: 1.5rem;
    color: var(--color-text-primary);
}

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

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 2;
}

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

.alternate-bg {
    background-color: var(--color-slate);
    position: relative;
}

.alternate-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
    pointer-events: none;
}

/* Header & Nav Moat */
.site-header {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background-color: rgba(10, 10, 11, 0.9);
    backdrop-filter: blur(24px);
    z-index: 1000;
}

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

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gold);
    display: flex;
    align-items: center;
}

.logo::before {
    content: '';
    width: 24px;
    height: 1px;
    background-color: var(--color-gold);
    margin-right: 12px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-gold);
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
    transition: var(--transition-premium);
}

.menu-toggle svg line {
    transition: var(--transition-premium);
    transform-origin: center;
}

.menu-toggle[aria-expanded="true"] svg line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] svg line:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] svg line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.menu-toggle:hover {
    transform: scale(1.1);
}

.no-scroll {
    overflow: hidden;
}

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

.nav-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
}

.nav-links a {
    padding: 0.5rem 0;
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    position: relative;
}

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

/* Nav Moat: High-Precision Underline */
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-gold);
    transition: var(--transition-premium);
}

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

.header-social {
    display: flex;
    gap: var(--spacing-sm);
    padding-left: var(--spacing-md);
    border-left: 1px solid var(--color-border);
}

.header-social a {
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-social a:hover {
    color: var(--color-gold);
    transform: translateY(-1px);
}

/* Buttons */
.cta-button {
    display: inline-block;
    padding: 1.25rem 2.5rem;
    border: 1px solid var(--color-gold);
    color: var(--color-gold);
    background: transparent;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.15em;
    cursor: pointer;
    transition: var(--transition-premium);
    font-family: inherit;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--color-gold);
    transition: var(--transition-premium);
    z-index: -1;
}

.cta-button:hover {
    color: var(--color-obsidian);
}

.cta-button:hover::before {
    left: 0;
}

.cta-small {
    padding: 0.5rem 1.25rem;
    border: 1px solid var(--color-gold);
    color: var(--color-gold) !important;
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.1em;
}

/* Hero Section Refined */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background-color: var(--color-obsidian);
}

/* Hero Background: Architectural Blueprint Effect */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(10, 10, 11, 0.7), rgba(10, 10, 11, 0.9));
    background-size: cover;
    background-position: center;
    filter: grayscale(100%) contrast(110%);
    opacity: 0.4;
    z-index: 0;
}

/* Architectural Grid Overlay */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-headline {
    max-width: 16ch;
    margin-bottom: var(--spacing-md);
}

.hero-subheadline {
    max-width: 50ch;
    margin-bottom: var(--spacing-lg);
    border-left: 2px solid var(--color-gold);
    padding-left: var(--spacing-md);
}

/* Briefing Form */
.briefing-container {
    max-width: 800px;
    margin: 0 auto;
}

.briefing-form {
    margin-top: var(--spacing-lg);
    display: grid;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--color-gold);
    font-weight: 700;
}

.form-group input, 
.form-group select, 
.form-group textarea {
    background-color: rgba(22, 22, 23, 0.6);
    border: 1px solid var(--color-border);
    padding: 1.25rem;
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-premium);
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-gold);
    background-color: rgba(28, 28, 29, 0.8);
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.checkbox-group input {
    width: auto;
    accent-color: var(--color-gold);
}

.checkbox-group label {
    text-transform: none;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    letter-spacing: 0;
}

.form-actions {
    margin-top: var(--spacing-md);
}

.status-box {
    padding: 1rem;
    margin-bottom: var(--spacing-md);
    border: 1px solid;
    background-color: rgba(22, 22, 23, 0.8);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.status-box.error {
    border-color: var(--color-error);
    color: var(--color-error);
}

.status-box.success {
    border-color: var(--color-success);
    color: var(--color-success);
}

/* Grid Layouts */
.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

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

.text-center p {
    margin-left: auto;
    margin-right: auto;
}

/* Portfolio & Insights Meta */
.meta-sidebar {
    padding-top: var(--spacing-xs);
}

.meta-sidebar h5 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--color-gold);
    text-transform: uppercase;
}

.meta-sidebar p {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

/* AHRI Badge Centering */
.badge-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: var(--spacing-lg) 0;
    width: 100%;
}

.badge-container img {
    display: block;
    margin: 0 auto;
}

/* Footer Refined */
.site-footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-obsidian);
    position: relative;
    z-index: 2;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.site-footer p {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0;
}

.social-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin: var(--spacing-md) 0;
}

.social-links a {
    color: var(--color-text-secondary);
    transition: var(--transition-premium);
}

.social-links a:hover {
    color: var(--color-gold);
    transform: scale(1.1);
}

.manifesto-link {
    font-size: 0.7rem;
    color: var(--color-gold) !important;
    text-decoration: none;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 700;
    opacity: 0.6;
    transition: var(--transition-premium);
}

.manifesto-link:hover {
    opacity: 1;
    letter-spacing: 0.25em;
}

/* Responsive Grid & Mobile Menu */
@media (max-width: 992px) {
    h1 { font-size: 2.75rem; }
    .grid { gap: var(--spacing-lg); }
}

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    
    .grid { 
        grid-template-columns: 1fr; 
        gap: var(--spacing-lg); 
    }

    .site-header {
        padding: var(--spacing-md) 0;
        position: sticky;
        top: 0;
        background-color: var(--color-obsidian);
        border-bottom: 1px solid var(--color-border);
    }

    .site-header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0;
    }

    .menu-toggle {
        display: block;
    }

    .nav-container {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: var(--color-obsidian);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-xl);
        z-index: 1000;
        padding: var(--spacing-xl) var(--spacing-md);
        transform: translateX(100%);
        transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
        visibility: hidden;
    }

    .nav-container.is-active {
        transform: translateX(0);
        visibility: visible;
    }

    .nav-links {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
        width: 100%;
    }

.nav-links li {
    width: auto;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-premium);
}

.nav-container.is-active .nav-links li {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered Delay for Premium Reveal */
.nav-container.is-active .nav-links li:nth-child(1) { transition-delay: 0.1s; }
.nav-container.is-active .nav-links li:nth-child(2) { transition-delay: 0.2s; }
.nav-container.is-active .nav-links li:nth-child(3) { transition-delay: 0.3s; }
.nav-container.is-active .nav-links li:nth-child(4) { transition-delay: 0.4s; }
.nav-container.is-active .nav-links li:nth-child(5) { transition-delay: 0.5s; }

.nav-links a {
        padding: 1rem 0;
        width: auto;
        font-size: 1.25rem;
        display: block;
        border-bottom: none;
    }

    .nav-links a.cta-small {
        margin-top: var(--spacing-md);
        border: 1px solid var(--color-gold);
        width: auto;
        display: inline-block;
        padding: 1rem 2.5rem;
        font-size: 1rem;
    }

    .header-social {
        padding-left: 0;
        border-left: none;
        justify-content: center;
        padding-top: var(--spacing-lg);
        width: 100%;
        gap: var(--spacing-lg);
    }

    .header-social svg {
        width: 24px;
        height: 24px;
    }

    .hero {
        padding: var(--spacing-xl) 0;
        min-height: auto;
        text-align: center;
    }

    .hero-headline {
        margin: 0 auto var(--spacing-md);
    }

    .hero-subheadline {
        font-size: 1.1rem;
        border-left: none;
        border-top: 2px solid var(--color-gold);
        padding-left: 0;
        padding-top: var(--spacing-md);
        margin: 0 auto var(--spacing-lg);
    }

    .logo {
        margin-bottom: var(--spacing-xs);
    }
}