/* ═══════════════════════════════════════════════
   ELMER TANG — IT PORTFOLIO STYLESHEET
   Dark Cybersecurity Theme · Neon Blue & Emerald
   ═══════════════════════════════════════════════ */

/* ── TOKENS ── */
:root {
    --bg-base: #0b0e14;
    --bg-surface: #111620;
    --bg-card: #151b28;
    --bg-card-hover: #1a2235;
    --accent-blue: #00aaff;
    --accent-green: #00e5a0;
    --accent-glow-b: rgba(0, 170, 255, 0.18);
    --accent-glow-g: rgba(0, 229, 160, 0.15);
    --text-primary: #e8edf5;
    --text-muted: #7a8799;
    --text-dim: #4a5568;
    --border: rgba(255,255,255,0.07);
    --border-accent: rgba(0, 170, 255, 0.25);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --font-display: 'Rajdhani', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;
    --font-body: 'DM Sans', sans-serif;
    --transition: 0.25s ease;
    --nav-h: 68px;
}

/* ── RESET ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    display: block;
}

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

ul {
    list-style: none;
}

/* ── UTILITY ── */
.container {
    width: min(1160px, 92vw);
    margin-inline: auto;
}

.section {
    padding-block: 96px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 56px;
    text-align: center;
}

.accent {
    color: var(--accent-blue);
}

/* ── BUTTONS ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent-green);
    color: #0b0e14;
    border-color: var(--accent-green);
}

    .btn-primary:hover {
        background: transparent;
        color: var(--accent-green);
        box-shadow: 0 0 20px var(--accent-glow-g);
    }

.btn-ghost {
    background: transparent;
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

    .btn-ghost:hover {
        background: var(--accent-blue);
        color: #0b0e14;
        box-shadow: 0 0 20px var(--accent-glow-b);
    }

.btn-lg {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* ════════════════════════════
   NAVIGATION
════════════════════════════ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-h);
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow 0.3s;
}

    .navbar.scrolled {
        box-shadow: 0 4px 30px rgba(0,0,0,0.5);
    }

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    width: min(1160px, 92vw);
    margin-inline: auto;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    color: var(--text-primary);
    letter-spacing: 0.1em;
}

.nav-logo-img {
    height: 36px;
    width: auto;
    display: block;
    object-fit: contain;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}

    .nav-links a {
        font-family: var(--font-display);
        font-size: 0.9rem;
        font-weight: 600;
        letter-spacing: 0.1em;
        text-transform: uppercase;
        color: var(--text-muted);
        transition: color var(--transition);
        position: relative;
    }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-blue);
            transition: width var(--transition);
        }

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

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

.nav-cta {
    background: var(--accent-blue) !important;
    color: #0b0e14 !important;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
}

    .nav-cta::after {
        display: none !important;
    }

    .nav-cta:hover {
        opacity: 0.85;
        color: #0b0e14 !important;
    }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

    .nav-toggle span {
        display: block;
        width: 24px;
        height: 2px;
        background: var(--text-primary);
        border-radius: 2px;
        transition: var(--transition);
    }

/* ════════════════════════════
   HERO
════════════════════════════ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-h);
    overflow: hidden;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(0,170,255,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(0,170,255,0.04) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 80%);
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    width: min(1160px, 92vw);
    margin-inline: auto;
    padding-block: 80px;
}

.hero-text {
    flex: 1;
    max-width: 580px;
}

.hero-eyebrow {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-green);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.4);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 5.5vw, 5rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero-desc {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 480px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* avatar */
.hero-avatar {
    position: relative;
    flex-shrink: 0;
}

.avatar-img {
    width: 105%;
    height: 105%;
    object-fit: cover;
    object-position: center top;
    border-radius: 50%;
    display: block;
}

.avatar-ring {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 2px solid var(--accent-blue);
    box-shadow: 0 0 0 8px rgba(0,170,255,0.06), 0 0 40px rgba(0,170,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #ffffff;
    overflow: hidden;
    animation: float 5s ease-in-out infinite;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    opacity: 0.9;
    overflow: hidden;
    margin-top: -30px;
    border-radius: 50%;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-12px);
    }
}

.avatar-badge {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-surface);
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    padding: 6px 16px;
    border-radius: 20px;
    white-space: nowrap;
}

.hero-scan-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
    opacity: 0.25;
    animation: scan 6s linear infinite;
    top: 0;
}

@keyframes scan {
    from {
        top: var(--nav-h);
    }

    to {
        top: 100%;
    }
}

/* ════════════════════════════
   ABOUT
════════════════════════════ */
.about {
    background: var(--bg-surface);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 18px;
    font-size: 1.05rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

    .stat-card:hover {
        border-color: var(--accent-blue);
        box-shadow: 0 0 20px var(--accent-glow-b);
    }

.stat-num {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ════════════════════════════
   PROJECTS
════════════════════════════ */
.filter-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 48px;
}

.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

    .filter-btn:hover {
        border-color: var(--accent-blue);
        color: var(--text-primary);
    }

    .filter-btn.active {
        background: var(--accent-blue);
        border-color: var(--accent-blue);
        color: #0b0e14;
    }

.filter-count {
    background: rgba(0,0,0,0.25);
    border-radius: 12px;
    padding: 1px 8px;
    font-size: 0.75rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card[data-category="technical"] {
    border-color: rgba(0, 229, 160, 0.3);
    background: linear-gradient(160deg, #0f1e1a 0%, var(--bg-card) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card[data-category="technical"]:hover {
    border-color: var(--accent-green);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3), 0 0 20px var(--accent-glow-g);
    transform: translateY(-6px);
}

.project-card[data-category="technical"] .card-tag {
    background: rgba(0, 229, 160, 0.12);
    color: var(--accent-green);
    border: 1px solid rgba(0, 229, 160, 0.3);
}

.project-card[data-category="digital"] {
    border-color: rgba(0, 170, 255, 0.3);
    background: linear-gradient(160deg, #0a1520 0%, var(--bg-card) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card[data-category="digital"]:hover {
     border-color: var(--accent-blue);
     box-shadow: 0 12px 40px rgba(0,0,0,0.3), 0 0 20px var(--accent-glow-b);
     transform: translateY(-6px);
}

.project-card[data-category="digital"] .card-tag {
     background: rgba(0, 170, 255, 0.12);
     color: var(--accent-blue);
     border: 1px solid rgba(0, 170, 255, 0.3);
 }

    .project-card.hidden {
        display: none;
    }

.card-icon-img {
    width: 70px;
    height: 70px;
    object-fit: cover;
    border-radius: 8px;
}

.card-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-blue);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: var(--accent-glow-b);
    padding: 4px 10px;
    border-radius: 4px;
    align-self: flex-start;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    flex: 1;
}

.card-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 4px;
}

.card-link {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--accent-blue);
    transition: gap var(--transition);
}

    .card-link:hover {
        opacity: 0.75;
    }

.badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    padding: 4px 10px;
    border-radius: 12px;
}

.badge-done {
    background: rgba(0, 229, 160, 0.12);
    color: var(--accent-green);
    border: 1px solid rgba(0, 229, 160, 0.3);
}

.badge-wip {
    background: rgba(0, 170, 255, 0.1);
    color: var(--accent-blue);
    border: 1px solid rgba(0, 170, 255, 0.25);
}

/* ════════════════════════════
   PROJECT MODAL
════════════════════════════ */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

    .modal-overlay.open {
        opacity: 1;
        pointer-events: all;
    }

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-lg);
    width: min(680px, 92vw);
    max-height: 88vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateY(24px);
    transition: transform 0.3s ease;
    box-shadow: 0 24px 80px rgba(0,0,0,0.6), 0 0 40px rgba(0,170,255,0.1);
}

.modal-overlay.open .modal {
    transform: translateY(0);
}

/* close button */
.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 10;
    background: rgba(0,0,0,0.5);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

    .modal-close:hover {
        background: var(--accent-blue);
        border-color: var(--accent-blue);
        color: #0b0e14;
    }

/* image slider */
.modal-image-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--bg-base);
    flex-shrink: 0;
    overflow: hidden;
}

.modal-slides {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.4s ease;
}

.modal-slide {
    min-width: 100%;
    height: 100%;
}

    .modal-slide img {
        width: 100%;
        height: 100%;
        object-fit: contain;
        object-position: center;
        display: block;
        background: #000;
    }

/* arrows */
.modal-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    background: rgba(0,0,0,0.55);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.6rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    line-height: 1;
}

    .modal-arrow:hover {
        background: var(--accent-blue);
        border-color: var(--accent-blue);
        color: #0b0e14;
    }

#modalPrev {
    left: 12px;
}

#modalNext {
    right: 12px;
}

/* dots */
.modal-dots {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
}

.modal-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

    .modal-dot.active {
        background: var(--accent-blue);
        box-shadow: 0 0 8px var(--accent-blue);
    }

/* text body */
.modal-body {
    padding: 28px 32px 32px;
    overflow-y: auto;
    flex: 1;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-blue) transparent;
}

    .modal-body::-webkit-scrollbar {
        width: 4px;
    }

    .modal-body::-webkit-scrollbar-thumb {
        background: var(--accent-blue);
        border-radius: 2px;
    }

.modal-title {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.modal-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}

.modal-chip {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.modal-desc {
    font-size: 0.97rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* mobile */
@media (max-width: 640px) {
    .modal-body {
        padding: 20px;
    }

    .modal-title {
        font-size: 1.2rem;
    }
}

/* ════════════════════════════
   SKILLS
════════════════════════════ */
.skills {
    background: var(--bg-surface);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color var(--transition), transform var(--transition);
}

    .skill-card:hover {
        border-color: var(--accent-green);
        transform: translateY(-4px);
        box-shadow: 0 8px 30px rgba(0,0,0,0.25), 0 0 16px var(--accent-glow-g);
    }

.skill-icon {
    font-size: 1.8rem;
}

.skill-card h3 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
}

.skill-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    flex: 1;
}

.proficiency-bar {
    margin-top: 4px;
}

.proficiency-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    margin-bottom: 6px;
}

.bar-track {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.07);
    border-radius: 2px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    width: var(--pct);
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    border-radius: 2px;
    box-shadow: 0 0 8px var(--accent-glow-b);
    animation: growBar 1.2s ease forwards;
}

@keyframes growBar {
    from {
        width: 0;
    }

    to {
        width: var(--pct);
    }
}

/* tools */
.tools-section {
    text-align: center;
}

.tools-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.tools-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.tool-chip {
    background: linear-gradient(135deg, #080b12 0%, #0d1229 50%, #12082a 100%);
    border: 1px solid var(--border-accent);
    color: var(--text-primary);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    padding: 8px 18px;
    border-radius: 6px;
    transition: var(--transition);
}

    .tool-chip:hover {
        border-color: var(--accent-blue);
        color: var(--accent-blue);
        background: var(--accent-glow-b);
    }

/* ════════════════════════════
   CONTACT
════════════════════════════ */
.contact {
    text-align: center;
    background: var(--bg-base);
    padding-bottom: 48px;
}

.contact-sub {
    color: var(--text-muted);
    max-width: 480px;
    margin: 0 auto 36px;
    font-size: 1.05rem;
}

.contact-links {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-top: 36px;
}

.contact-link {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    padding-bottom: 4px;
    transition: color var(--transition), border-color var(--transition);
}

    .contact-link:hover {
        color: var(--accent-blue);
        border-color: var(--accent-blue);
    }

.copyright {
    margin-top: 64px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 0.08em;
}

/* ════════════════════════════
   RESPONSIVE
════════════════════════════ */
@media (max-width: 960px) {
    .hero-inner {
        flex-direction: column;
        text-align: center;
    }

    .hero-eyebrow {
        justify-content: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-desc {
        margin-inline: auto;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

@media (max-width: 640px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--nav-h);
        left: 0;
        right: 0;
        background: var(--bg-surface);
        border-bottom: 1px solid var(--border);
        padding: 20px 24px;
        gap: 20px;
    }

        .nav-links.open {
            display: flex;
        }

    .nav-toggle {
        display: flex;
    }

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

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

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .avatar-ring {
        width: 220px;
        height: 220px;
    }

    .section {
        padding-block: 64px;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
}