/* ===================================
   XToken VC - Dark Premium Theme
   Top-tier VC aesthetic with perfect grid alignment
   =================================== */

/* ===== CSS RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Dark Premium Color Palette */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-card: #151515;
    --color-border: #282828;
    --color-border-hover: #3a3a3a;
    
    /* Accent Colors */
    --color-accent-primary: #6366f1;
    --color-accent-hover: #7c3aed;
    --color-accent-light: rgba(99, 102, 241, 0.1);
    
    /* Text Colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #a3a3a3;
    --color-text-tertiary: #737373;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-unit: 8px;
    --container-max: 1200px;
    --container-padding: 24px;
    
    /* Effects */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.6);
    --border-radius: 8px;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: calc(var(--spacing-unit) * 2.5);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

h4 {
    font-size: 1.25rem;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

p {
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-accent-primary);
    text-decoration: none;
    transition: var(--transition-base);
}

a:hover {
    color: var(--color-accent-hover);
}

/* ===== LAYOUT ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: calc(var(--spacing-unit) * 12) 0;
}

.section-sm {
    padding: calc(var(--spacing-unit) * 8) 0;
}

.section-lg {
    padding: calc(var(--spacing-unit) * 16) 0;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 2.5) var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.03em;
}

.nav-menu {
    display: flex;
    gap: calc(var(--spacing-unit) * 4);
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: calc(var(--spacing-unit) * 1) 0;
    position: relative;
    transition: var(--transition-base);
}

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

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

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-base);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--spacing-unit) * 10);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent-primary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.hero-title {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 4);
    line-height: 1.5;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
    margin-top: calc(var(--spacing-unit) * 6);
}

.hero-stat {
    border-left: 2px solid var(--color-accent-primary);
    padding-left: calc(var(--spacing-unit) * 2);
}

.hero-stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.hero-stat-label {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 1.75) calc(var(--spacing-unit) * 4);
    font-size: 0.9375rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

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

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

.btn-group {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    flex-wrap: wrap;
}

/* ===== CARDS - PERFECT GRID ALIGNMENT ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: calc(var(--spacing-unit) * 3);
    align-items: stretch;
}

.card-grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
}

.card-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.card-grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 4);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.card-header {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent-light);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-size: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.card-description {
    color: var(--color-text-secondary);
    margin-bottom: auto;
    line-height: 1.6;
}

.card-footer {
    margin-top: calc(var(--spacing-unit) * 2);
    padding-top: calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--color-border);
}

.card-meta {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ===== FORMS ===== */
.form-group {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.form-label {
    display: block;
    margin-bottom: calc(var(--spacing-unit) * 1);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.75) calc(var(--spacing-unit) * 2);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: var(--transition-base);
}

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

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

.form-help {
    display: block;
    margin-top: calc(var(--spacing-unit) * 0.75);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.form-error {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: calc(var(--spacing-unit) * 0.75);
}

.form-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 2);
    color: #22c55e;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

/* ===== PORTFOLIO GRID ===== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 3);
}

.portfolio-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 4);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.portfolio-card:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.portfolio-logo {
    width: 64px;
    height: 64px;
    background: var(--color-accent-light);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent-primary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.portfolio-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.portfolio-category {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.portfolio-description {
    color: var(--color-text-secondary);
    margin-bottom: auto;
    line-height: 1.6;
}

/* ===== TEAM GRID ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.team-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 4);
    text-align: center;
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}

.team-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.team-avatar {
    width: 120px;
    height: 120px;
    background: var(--color-accent-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent-primary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.team-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.team-role {
    font-size: 0.9375rem;
    color: var(--color-accent-primary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.team-bio {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: auto;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 4) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: calc(var(--spacing-unit) * 6);
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.footer-section h4 {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

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

.footer-bottom {
    padding-top: calc(var(--spacing-unit) * 4);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.text-accent {
    color: var(--color-accent-primary);
}

.mb-1 { margin-bottom: calc(var(--spacing-unit) * 1); }
.mb-2 { margin-bottom: calc(var(--spacing-unit) * 2); }
.mb-3 { margin-bottom: calc(var(--spacing-unit) * 3); }
.mb-4 { margin-bottom: calc(var(--spacing-unit) * 4); }
.mb-6 { margin-bottom: calc(var(--spacing-unit) * 6); }
.mb-8 { margin-bottom: calc(var(--spacing-unit) * 8); }

.mt-1 { margin-top: calc(var(--spacing-unit) * 1); }
.mt-2 { margin-top: calc(var(--spacing-unit) * 2); }
.mt-3 { margin-top: calc(var(--spacing-unit) * 3); }
.mt-4 { margin-top: calc(var(--spacing-unit) * 4); }
.mt-6 { margin-top: calc(var(--spacing-unit) * 6); }
.mt-8 { margin-top: calc(var(--spacing-unit) * 8); }

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    .card-grid-2 {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 16px;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: calc(var(--spacing-unit) * 3);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        min-height: 80vh;
    }
    
    .card-grid,
    .card-grid-3,
    .card-grid-4 {
        grid-template-columns: 1fr;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 3);
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Scroll animations */
.scroll-fade {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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