/* ================================
   Modern 2026 Portfolio - Frey Brightwater
   ================================ */

:root {
    /* Colors */
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-surface-hover: #1a1a1a;
    --color-text: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #6b6b6b;
    --color-border: #2a2a2a;

    /* Accent Colors */
    --color-accent-vr: #00d9ff;
    --color-accent-ai: #ff6b9d;
    --color-accent-primary: #00ff94;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;

    /* Spacing */
    --space-unit: 8px;
    --space-xs: calc(var(--space-unit) * 2);
    --space-sm: calc(var(--space-unit) * 3);
    --space-md: calc(var(--space-unit) * 4);
    --space-lg: calc(var(--space-unit) * 6);
    --space-xl: calc(var(--space-unit) * 8);
    --space-2xl: calc(var(--space-unit) * 12);
    --space-3xl: calc(var(--space-unit) * 16);

    /* Layout */
    --max-width: 1200px;
    --nav-height: 80px;

    /* Transitions */
    --transition: 0.2s 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-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: var(--color-accent-primary);
    color: var(--color-bg);
}

/* ================================
   Navigation
   ================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

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

.nav-brand {
    font-size: 20px;
    font-weight: var(--font-weight-black);
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

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

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: var(--font-weight-medium);
    transition: var(--transition);
}

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

.nav-link-cta {
    color: var(--color-accent-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
}

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

/* ================================
   Hero
   ================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--nav-height) var(--space-lg) var(--space-3xl);
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.hero-label {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: var(--font-weight-black);
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
    padding-bottom: 0.1em;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-description {
    font-size: clamp(18px, 2vw, 24px);
    color: var(--color-text-secondary);
    max-width: 700px;
    line-height: 1.5;
    margin-bottom: var(--space-2xl);
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-xl);
    max-width: 700px;
    margin-bottom: var(--space-2xl);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.metric-value {
    font-size: 48px;
    font-weight: var(--font-weight-black);
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--color-accent-primary);
    margin-bottom: var(--space-xs);
}

.metric-label {
    font-size: 14px;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: var(--font-weight-medium);
}

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

/* ================================
   Buttons
   ================================ */

.btn {
    display: inline-flex;
    align-items: center;
    padding: 16px 32px;
    font-size: 15px;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 255, 148, 0.3);
}

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

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

/* ================================
   Section Heading
   ================================ */

.section-heading {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: var(--font-weight-black);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-2xl);
}

/* ================================
   Work
   ================================ */

.work {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--color-surface);
}

.work-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.project {
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-3xl);
    border-bottom: 1px solid var(--color-border);
}

.project:last-child {
    border-bottom: none;
}

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

.project-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 6px 12px;
    border-radius: 4px;
    margin-bottom: var(--space-md);
}

.tag-vr {
    background: rgba(0, 217, 255, 0.1);
    color: var(--color-accent-vr);
    border: 1px solid rgba(0, 217, 255, 0.2);
}

.tag-ai {
    background: rgba(255, 107, 157, 0.1);
    color: var(--color-accent-ai);
    border: 1px solid rgba(255, 107, 157, 0.2);
}

.project-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: var(--font-weight-black);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.project-role {
    font-size: 16px;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.project-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.project-grid-reverse {
    grid-template-columns: 1fr 1fr;
}

.project-grid-reverse .project-media {
    order: -1;
}

.project-lead {
    font-size: 20px;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: var(--space-xl);
}

.project-impact {
    margin-bottom: var(--space-xl);
}

.project-impact h4 {
    font-size: 14px;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.project-impact ul {
    list-style: none;
}

.project-impact li {
    padding-left: 24px;
    margin-bottom: var(--space-sm);
    position: relative;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.project-impact li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.tech {
    font-size: 13px;
    padding: 6px 12px;
    background: var(--color-surface-hover);
    color: var(--color-text-secondary);
    border-radius: 4px;
    font-weight: var(--font-weight-medium);
}

.project-links {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    font-size: 15px;
    transition: var(--transition);
}

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

.project-media {
    display: grid;
    gap: var(--space-md);
}

.media-item {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

/* ================================
   Skills
   ================================ */

.skills {
    padding: var(--space-3xl) var(--space-lg);
}

.skills-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.skills-grid {
    display: grid;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
}

.skill-group {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.skill-heading {
    font-size: 24px;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-lg);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.skill-tag {
    font-size: 14px;
    padding: 10px 16px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border-radius: 6px;
    font-weight: var(--font-weight-medium);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.skill-tag:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-primary);
    color: var(--color-text);
}

.skill-tag.primary {
    background: rgba(0, 255, 148, 0.1);
    border-color: rgba(0, 255, 148, 0.2);
    color: var(--color-accent-primary);
}

.education {
    padding-top: var(--space-xl);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.education-item {
    padding: var(--space-lg);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.education-degree {
    font-size: 18px;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
}

.education-school {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
    font-size: 15px;
}

.education-year {
    color: var(--color-text-tertiary);
    font-size: 14px;
}

/* ================================
   Contact
   ================================ */

.contact {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--color-surface);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-lead {
    font-size: 20px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
}

.contact-links {
    display: grid;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.contact-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-decoration: none;
    transition: var(--transition);
}

.contact-link:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
}

.contact-label {
    font-size: 14px;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: var(--font-weight-semibold);
}

.contact-value {
    font-size: 18px;
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

.contact-location {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: 15px;
}

/* ================================
   Footer
   ================================ */

.footer {
    padding: var(--space-2xl) var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-tertiary);
    font-size: 14px;
}

/* ================================
   Responsive
   ================================ */

@media (max-width: 768px) {
    :root {
        --space-lg: calc(var(--space-unit) * 3);
        --space-xl: calc(var(--space-unit) * 5);
        --space-2xl: calc(var(--space-unit) * 8);
        --space-3xl: calc(var(--space-unit) * 10);
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        right: -100%;
        height: calc(100vh - var(--nav-height));
        width: 100%;
        max-width: 400px;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-xl);
        border-left: 1px solid var(--color-border);
        transition: var(--transition);
        gap: var(--space-md);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-link {
        font-size: 18px;
        padding: var(--space-sm) 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

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

    .metric-value {
        font-size: 36px;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }

    .project-grid,
    .project-grid-reverse {
        grid-template-columns: 1fr;
    }

    .project-grid-reverse .project-media {
        order: 0;
    }

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

    .footer-container {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 40px;
    }

    .section-heading {
        font-size: 32px;
    }

    .project-title {
        font-size: 28px;
    }

    .project-lead {
        font-size: 18px;
    }
}