:root {
    --font-mono: 'Roboto Mono', monospace;

    /* Color Palette */
    --bg-dark: #0a0e14;
    --card-bg: rgba(16, 22, 31, 0.85);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-border-hover: rgba(45, 212, 191, 0.35);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-teal: #2dd4bf;
    --accent-amber: #f59e0b;
    --accent-cyan: #38bdf8;
    --accent-purple: #c084fc;

    /* Layout */
    --max-width: 1140px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-mono);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Fixed background canvas hook for future dynamic animation */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
}

/* Site Content Container */
.site-wrapper {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 4rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header / Hero Section */
.hero {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2.5rem;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: #ffffff;
    margin-bottom: 1.5rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.hero-title .divider {
    color: var(--text-muted);
    font-weight: 300;
    margin: 0 0.4rem;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 2rem;
}

.hero-sub {
    font-size: .8rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0rem;
}

/* Contact Links */
.contact-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1.75rem;
    font-size: 1rem;
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    /* border-radius: 6px; */
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-fast);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.contact-item .label {
    color: var(--text-secondary);
}

.contact-item .highlight-teal {
    color: var(--accent-teal);
    font-weight: 600;
}

.contact-item .highlight-amber {
    color: var(--accent-amber);
    font-weight: 600;
}

/* Copyable Email Tooltip */
.copyable {
    cursor: pointer;
    position: relative;
}

.copy-tooltip {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    background: var(--accent-amber);
    color: #000;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 8px;
    /* border-radius: 4px; */
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    pointer-events: none;
}

.copy-tooltip.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Projects Section */
.projects-section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 1.1rem;
    text-transform: lowercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 2.5rem;
    font-weight: 500;
}

/* Year Section Grouping */
.year-group {
    margin-bottom: 3.5rem;
}

.year-header {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-teal);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: 0.05em;
}

.year-header::after {
    content: '';
    flex-grow: 1;
    height: 1px;
    background: rgba(255, 255, 255, 0.08);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
}

/* Project Card */
.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    /* border-radius: 14px; */
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-fast);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--card-border-hover);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5), 0 0 15px rgba(45, 212, 191, 0.1);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.project-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
    word-break: break-word;
}

/* Badges */
.badge {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.65rem;
    /* border-radius: 20px; */
    text-transform: lowercase;
    white-space: nowrap;
    flex-shrink: 0;
    text-align: center;
}

.badge-business,
.badge-b {
    color: var(--accent-purple);
    background: rgba(192, 132, 252, 0.1);
    border: 1px solid rgba(192, 132, 252, 0.35);
}

.badge-closed {
    color: var(--accent-amber);
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.badge-open {
    color: var(--accent-teal);
    background: rgba(45, 212, 191, 0.1);
    border: 1px solid rgba(45, 212, 191, 0.35);
}

/* Card Image */
.card-image-wrapper {
    width: 100%;
    height: 190px;
    /* border-radius: 8px; */
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.06);
    margin-bottom: 1.25rem;
    background: #000;
}

.card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    transition: transform 0.4s ease;
}

.project-card:hover .card-image-wrapper img {
    transform: scale(1.03);
}

/* Card Content */
.card-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    margin-bottom: 1.25rem;
}

.project-pitch {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.project-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-weight: 400;
}

/* Tech Stack Tags */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.5rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.tech-tag {
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    /* border-radius: 6px; */
    font-family: var(--font-mono);
    text-transform: lowercase;
    display: inline-flex;
    align-items: center;
    border: 1px solid transparent;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.tech-tag:hover {
    transform: translateY(-1px);
}

/* Global Language & Tool Color Palette (Active Tags) */

/* Web Ecosystem (Web, React, Vite, UI/UX, HTML) */
.tech-web,
.tech-react,
.tech-vite,
.tech-ui {
    background: rgba(14, 165, 233, 0.16);
    color: #7dd3fc;
    border-color: rgba(14, 165, 233, 0.38);
}

/* JavaScript / Web Logic */
.tech-javascript {
    background: rgba(234, 179, 8, 0.16);
    color: #fef08a;
    border-color: rgba(234, 179, 8, 0.38);
}

/* PCB Design (Lilac / Light Magenta) */
.tech-pcb-design {
    background: rgba(217, 70, 239, 0.16);
    color: #e9d5ff;
    border-color: rgba(217, 70, 239, 0.38);
}

/* Robotics (Light Coral / Pink) */
.tech-robotics {
    background: rgba(244, 63, 94, 0.16);
    color: #fca5a5;
    border-color: rgba(244, 63, 94, 0.38);
}

/* C# (Hot Pink) */
.tech-csharp {
    background: rgba(236, 72, 153, 0.16);
    color: #f472b6;
    border-color: rgba(236, 72, 153, 0.38);
}

/* Embedded Microcontrollers */
.tech-embedded {
    background: rgba(16, 185, 129, 0.16);
    color: #6ee7b7;
    border-color: rgba(16, 185, 129, 0.38);
}

/* Arduino */
.tech-arduino {
    background: rgba(6, 182, 212, 0.16);
    color: #67e8f9;
    border-color: rgba(6, 182, 212, 0.38);
}

/* Physical Hardware */
.tech-hardware {
    background: rgba(249, 115, 22, 0.16);
    color: #fed7aa;
    border-color: rgba(249, 115, 22, 0.38);
}

/* Python */
.tech-python {
    background: rgba(59, 130, 246, 0.16);
    color: #93c5fd;
    border-color: rgba(59, 130, 246, 0.38);
}

/* C++ */
.tech-cplusplus {
    background: rgba(168, 85, 247, 0.16);
    color: #c084fc;
    border-color: rgba(168, 85, 247, 0.38);
}

/* 3D Modeling / CAD */
.tech-cad {
    background: rgba(148, 163, 184, 0.16);
    color: #e2e8f0;
    border-color: rgba(148, 163, 184, 0.38);
}

/* MediaPipe */
.tech-mediapipe {
    background: rgba(232, 121, 249, 0.16);
    color: #f0abfc;
    border-color: rgba(232, 121, 249, 0.38);
}

/* OpenCV */
.tech-opencv {
    background: rgba(5, 150, 105, 0.16);
    color: #a7f3d0;
    border-color: rgba(5, 150, 105, 0.38);
}

/* Unity */
.tech-unity {
    background: rgba(99, 102, 241, 0.16);
    color: #c7d2fe;
    border-color: rgba(99, 102, 241, 0.38);
}

/* Fallback for unlisted tech tags */
.tech-tag:not([class*="tech-"]) {
    background: rgba(148, 163, 184, 0.12);
    color: var(--text-secondary);
    border-color: rgba(148, 163, 184, 0.25);
}

/* Card Footer */
.card-footer {
    padding-top: 1rem;
    margin-top: auto;
    border-top: 1px dashed rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

/* GitHub Source Button */
.btn-source {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: fit-content;
    padding: 0.5rem 1rem;
    background: rgba(45, 212, 191, 0.08);
    border: 1px solid rgba(45, 212, 191, 0.35);
    color: var(--accent-teal);
    /* border-radius: 8px; */
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-source:hover {
    background: rgba(45, 212, 191, 0.18);
    border-color: var(--accent-teal);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(45, 212, 191, 0.2);
}

/* Sub-links (Videos, Demos, Docs) */
.project-sublink {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.project-sublink:hover {
    color: var(--accent-teal);
    text-decoration: underline;
}

/* Closed Source Notice */
.closed-source-note {
    font-size: 0.85rem;
    color: var(--accent-amber);
    line-height: 1.5;
    font-weight: 400;
}

/* Footer */
.site-footer {
    margin-top: auto;
    padding-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Responsive Adjustments */
@media (max-width: 992px) {
    .projects-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .site-wrapper {
        padding: 2.5rem 1rem 1.5rem;
    }

    .hero-title {
        font-size: 1.65rem;
    }

    .hero-title .divider {
        display: block;
        height: 0;
        visibility: hidden;
    }

    .contact-links {
        flex-direction: column;
        gap: 0.75rem;
    }
}

@media (max-width: 640px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Project Detail Modal Overlay & Interactive Gallery
   ========================================================================== */

.project-card {
    cursor: pointer;
}

.project-card::after {
    content: 'Click to expand ↗';
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    margin-top: 0.75rem;
    display: block;
    opacity: 0;
    transform: translateY(4px);
    transition: all var(--transition-fast);
}

.project-card:hover::after {
    opacity: 1;
    transform: translateY(0);
    color: var(--accent-teal);
}

/* Modal Popup Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* Modal Floating Transparent Overlay with Full Backdrop Blur */
.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(8, 12, 18, 0.45);
    backdrop-filter: blur(28px) brightness(0.6);
    -webkit-backdrop-filter: blur(28px) brightness(0.6);
}

.modal-container {
    position: relative;
    z-index: 1001;
    width: 100%;
    max-width: 880px;
    max-height: 92vh;
    background: transparent;
    border: none;
    overflow-y: auto;
    padding: 1.5rem 1rem;
    box-shadow: none;
    transform: scale(0.95) translateY(12px);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    color: var(--text-primary);
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.modal-overlay.active .modal-container {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: fixed;
    top: 2rem;
    right: 2.5rem;
    width: 42px;
    height: 42px;
    /* border-radius: 50%; */
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 1010;
    backdrop-filter: blur(8px);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
    transform: scale(1.1);
    border-color: var(--accent-teal);
}

/* Modal Content Layout */
.modal-body {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

/* Floating Media Display & Gallery Carousel */
.modal-media-wrapper {
    width: 100%;
    /* border-radius: 14px; */
    overflow: hidden;
    background: #000;
    border: 1px solid rgba(255, 255, 255, 0.12);
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
}

.modal-media-container {
    width: 100%;
    max-height: 440px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: #000;
}

.modal-media-container img,
.modal-media-container video {
    width: 100%;
    height: 100%;
    max-height: 440px;
    object-fit: contain;
    background: #000;
}

/* Gallery Prev / Next Overlay Arrow Controls */
.gallery-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(10, 14, 20, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 15;
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0.85;
}

.gallery-arrow:hover {
    opacity: 1;
    background: rgba(45, 212, 191, 0.25);
    border-color: var(--accent-teal);
    color: #ffffff;
    transform: translateY(-50%) scale(1.1);
}

.gallery-arrow-prev {
    left: 0.75rem;
}

.gallery-arrow-next {
    right: 0.75rem;
}

/* Gallery Thumbnails Horizontal Scroll Bar */
.modal-gallery-nav {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.6rem;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.6);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    overflow-x: auto;
    white-space: nowrap;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.25) transparent;
}

.modal-gallery-nav::-webkit-scrollbar {
    height: 4px;
}

.modal-gallery-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.25);
    border-radius: 4px;
}

.gallery-thumb {
    width: 54px;
    height: 38px;
    flex-shrink: 0;
    object-fit: cover;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    cursor: pointer;
    opacity: 0.9;
    filter: saturate(1) contrast(1);
    transition: all 0.2s ease;
}

.gallery-thumb:hover,
.gallery-thumb.active {
    opacity: 1;
    border-color: var(--accent-teal);
    transform: scale(1.08);
    box-shadow: 0 0 10px rgba(45, 212, 191, 0.4);
}

/* Modal Header & Text Typography */
.modal-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.modal-title-text {
    font-size: 1.85rem;
    font-weight: 700;
    color: #ffffff;
}

.modal-pitch-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-teal);
    margin-bottom: 0.75rem;
}

.modal-desc-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.modal-tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.modal-footer-row {
    padding-top: 1.25rem;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

/* Responsive Modal Adjustments */
@media (max-width: 640px) {
    .modal-container {
        padding: 1.5rem;
        max-height: 95vh;
    }

    .modal-title-text {
        font-size: 1.4rem;
    }

    .modal-media-container {
        max-height: 260px;
    }
}