/* =============================================
   INVISION PROJECT PAGE - ADI DESAI
   ============================================= */

:root {
    /* COLORS - Matching poster: navy blue + light blue */
    --color-bg: #0a1628;
    --color-bg-elevated: #0f1d32;
    --color-card: #142440;
    --color-card-hover: #1a2d4d;
    --color-border: #234170;
    --color-border-hover: #3b5998;
    --color-text: #f5f7fa;
    --color-text-secondary: #a8b5c8;
    --color-text-tertiary: #6b7d99;
    --color-accent: #4a9eff;
    --color-accent-secondary: #00d4aa;
    --color-navy: #1a365d;
    --color-light-blue: #e8f4fc;

    /* FONTS */
    --font-main: 'Sora', -apple-system, sans-serif;

    /* TRANSITIONS */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.2s var(--transition-smooth);
    --transition-normal: 0.3s var(--transition-smooth);
}

/* =============================================
   BASE STYLES
   ============================================= */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.noise {
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: 100;
}

a {
    text-decoration: none;
    color: inherit;
}

/* =============================================
   NAVIGATION
   ============================================= */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 48px;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-accent);
    border-radius: 50%;
    color: var(--color-accent);
    background: var(--color-bg);
    transition: var(--transition-normal);
}

.logo:hover {
    background: var(--color-accent);
    color: var(--color-bg);
    transform: scale(1.05);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-right a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

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

.nav-cta {
    padding: 10px 20px;
    border: 1px solid var(--color-accent);
    border-radius: 24px;
    color: var(--color-accent) !important;
}

.nav-cta:hover {
    background: var(--color-accent);
    color: var(--color-bg) !important;
}

/* =============================================
   PROJECT HERO
   ============================================= */
.project-hero {
    padding: 160px 48px 80px;
    background: linear-gradient(180deg, rgba(107, 138, 255, 0.08) 0%, transparent 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-content {
    max-width: 900px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-accent);
    margin-bottom: 32px;
    transition: var(--transition-fast);
}

.back-link:hover {
    gap: 12px;
}

.project-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.project-meta span {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    padding: 6px 12px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
}

.project-hero h1 {
    font-size: clamp(3rem, 10vw, 5rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.project-subtitle {
    font-size: 1.125rem;
    color: var(--color-accent);
    margin-bottom: 24px;
    font-weight: 400;
}

.project-tagline {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    line-height: 1.7;
    margin-bottom: 32px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    font-size: 0.75rem;
    padding: 8px 16px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    color: var(--color-text-secondary);
}

/* =============================================
   CONTENT SECTIONS
   ============================================= */
.project-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 48px;
}

.content-section {
    padding: 80px 0;
    border-bottom: 1px solid var(--color-border);
}

.content-section:last-child {
    border-bottom: none;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
}

.section-number {
    font-size: 0.75rem;
    color: var(--color-accent);
    font-weight: 600;
}

.section-header h2 {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text);
}

.section-body p {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.section-body p.lead {
    font-size: 1.25rem;
    color: var(--color-text);
    font-weight: 300;
}

/* =============================================
   HIGHLIGHT BOX
   ============================================= */
.highlight-box {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: 12px;
    padding: 32px;
    margin-top: 32px;
}

.highlight-box h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 20px;
    color: var(--color-text);
}

.feature-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.feature {
    font-size: 0.875rem;
    padding: 8px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    color: var(--color-text-secondary);
}

/* =============================================
   STATS GRID
   ============================================= */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 40px 0;
}

.stat-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 28px;
    text-align: center;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-secondary));
    transform: scaleY(0);
    transition: var(--transition-normal);
}

.stat-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.stat-card:hover::before {
    transform: scaleY(1);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-accent);
    display: block;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--color-text);
    display: block;
    margin-bottom: 8px;
}

.stat-detail {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

/* =============================================
   GAP ANALYSIS
   ============================================= */
.gap-analysis {
    margin-top: 48px;
}

.gap-analysis h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 20px;
    color: var(--color-text);
}

.gap-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.gap-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
}

.gap-card h4 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--color-text);
}

.gap-card p {
    font-size: 0.875rem !important;
    color: var(--color-text-secondary);
    margin-bottom: 0 !important;
    line-height: 1.6 !important;
}

/* =============================================
   SENSOR GRID - Expandable Cards
   ============================================= */
.sensor-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 40px 0;
}

.sensor-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    transition: var(--transition-normal);
}

.sensor-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-secondary));
    transform: scaleY(0);
    transition: var(--transition-normal);
}

.sensor-card:hover {
    border-color: var(--color-border-hover);
}

.sensor-card:hover::before {
    transform: scaleY(1);
}

/* Hidden checkbox for toggle */
.sensor-toggle {
    display: none;
}

/* Clickable header */
.sensor-header {
    padding: 28px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    position: relative;
}

.sensor-header::after {
    content: '+';
    position: absolute;
    top: 28px;
    right: 28px;
    font-size: 1.5rem;
    color: var(--color-accent);
    transition: var(--transition-normal);
    font-weight: 300;
}

.sensor-toggle:checked + .sensor-header::after {
    content: '−';
}

.sensor-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 16px;
    color: var(--color-accent);
}

.sensor-icon svg {
    width: 100%;
    height: 100%;
}

.sensor-header h4 {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text);
    padding-right: 40px;
}

.sensor-tech {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.sensor-summary {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Expandable content */
.sensor-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--transition-smooth), padding 0.4s var(--transition-smooth);
    background: var(--color-bg-elevated);
    border-top: 1px solid transparent;
}

.sensor-toggle:checked ~ .sensor-details {
    max-height: 500px;
    border-top-color: var(--color-border);
}

.sensor-details-inner {
    padding: 24px 28px;
}

.sensor-details h5 {
    font-size: 0.8125rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.sensor-details p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.sensor-details p:last-child {
    margin-bottom: 0;
}

.sensor-details ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sensor-details li {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    border-bottom: 1px solid var(--color-border);
}

.sensor-details li:last-child {
    border-bottom: none;
}

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

.architecture-note {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    margin-top: 32px;
}

.architecture-note h3 {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--color-text);
}

.architecture-note p {
    font-size: 0.875rem !important;
    color: var(--color-accent);
    font-family: monospace;
    margin-bottom: 0 !important;
}

/* =============================================
   RESEARCH QUESTIONS
   ============================================= */
.research-questions {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.question-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.question-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-border-hover);
    border-radius: 3px 0 0 3px;
}

.question-card.primary::before {
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-secondary));
}

.question-label {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    display: block;
    margin-bottom: 8px;
}

.question-card.primary .question-label {
    color: var(--color-accent);
}

.question-card p {
    font-size: 1rem !important;
    color: var(--color-text-secondary);
    margin-bottom: 0 !important;
    line-height: 1.6 !important;
}

.question-card.primary p {
    color: var(--color-text);
}

/* =============================================
   APPLICATIONS GRID
   ============================================= */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.app-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-secondary));
    transform: scaleY(0);
    transition: var(--transition-normal);
}

.app-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.app-card:hover::before {
    transform: scaleY(1);
}

.app-card h4 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text);
}

.app-card p {
    font-size: 0.875rem !important;
    color: var(--color-text-secondary);
    margin-bottom: 0 !important;
    line-height: 1.5 !important;
}

/* =============================================
   FUTURE WORK
   ============================================= */
.future-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.future-item {
    display: flex;
    gap: 20px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.future-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-secondary));
    transform: scaleY(0);
    transition: var(--transition-normal);
}

.future-item:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.future-item:hover::before {
    transform: scaleY(1);
}

.future-number {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-accent);
    opacity: 0.5;
    line-height: 1;
}

.future-content h4 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--color-text);
}

.future-content p {
    font-size: 0.875rem !important;
    color: var(--color-text-secondary);
    margin-bottom: 0 !important;
}

/* =============================================
   TEAM
   ============================================= */
.team-grid {
    display: flex;
    gap: 16px;
}

.team-member {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: 12px;
    padding: 24px 28px;
    flex: 1;
}

.team-member h4 {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--color-text);
}

.team-member p {
    font-size: 0.875rem !important;
    color: var(--color-text-secondary);
    margin-bottom: 0 !important;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    display: flex;
    justify-content: space-between;
    padding: 28px 48px;
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    background: var(--color-bg-elevated);
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

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

    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        padding: 20px 24px;
    }

    .nav-right a:not(.nav-cta) {
        display: none;
    }

    .project-hero {
        padding: 120px 24px 48px;
    }

    .project-content {
        padding: 0 24px;
    }

    .content-section {
        padding: 48px 0;
    }

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

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

    .team-grid {
        flex-direction: column;
    }

    .footer {
        padding: 24px;
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}