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

:root {
    --bg:        #080b10;
    --surface:   #0d1117;
    --surface2:  #161c24;
    --surface3:  #1e2631;
    --border:    rgba(255,255,255,0.07);
    --accent:    #00d4ff;
    --accent2:   #00ff9d;
    --text:      #b0bec5;
    --text-dim:  #546e7a;
    --white:     #e8edf2;
    --font-mono: 'Space Mono', monospace;
    --font-sans: 'Outfit', sans-serif;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.7;
}

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

/* ===========================
   ANIMATED BACKGROUND
=========================== */
.bg-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    background-image:
        linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.bg-glow {
    position: fixed;
    top: -200px;
    left: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,212,255,0.05) 0%, transparent 70%);
    z-index: 0;
    pointer-events: none;
    animation: glowDrift 12s ease-in-out infinite alternate;
}

@keyframes glowDrift {
    from { transform: translate(0,0); }
    to   { transform: translate(300px, 200px); }
}

/* ===========================
   LAYOUT
=========================== */
.container {
    position: relative;
    z-index: 1;
    display: flex;
    max-width: 1200px;
    margin: 40px auto;
    padding: 20px;
    gap: 30px;
    min-height: calc(100vh - 80px);
}

/* ===========================
   LEFT COLUMN
=========================== */
.left-column {
    width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 40px;
    align-self: flex-start;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px 24px;
    animation: slideInLeft 0.6s ease both;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* Profile */
.profile-wrap {
    position: relative;
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

.profile-ring {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    padding: 3px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
}

.profile-ring img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    border: 2px solid var(--surface);
}

.status-dot {
    position: absolute;
    bottom: 6px;
    right: 72px;
    width: 12px;
    height: 12px;
    background: var(--accent2);
    border-radius: 50%;
    border: 2px solid var(--surface);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0,255,157,0.4); }
    50%       { box-shadow: 0 0 0 6px rgba(0,255,157,0); }
}

/* Name */
.name-block {
    text-align: center;
    margin-bottom: 8px;
}

.name-block h1 {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.title-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent);
    margin-top: 8px;
    letter-spacing: 1px;
}

.bracket { color: var(--accent2); }

/* Divider */
.divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

/* Section label */
.section-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 1px;
    margin-bottom: 14px;
}

/* Tools */
.tools {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tool-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all 0.25s ease;
    cursor: default;
}

.tool-item:hover {
    background: var(--surface2);
    border-color: var(--border);
}

.tool-item img,
.tool-item i {
    width: 20px;
    height: 20px;
    object-fit: contain;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.tool-item span {
    font-size: 0.8rem;
    color: var(--text);
    font-family: var(--font-mono);
}

/* Contacts */
.contacts {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 8px;
    border: 1px solid transparent;
    color: var(--text);
    font-size: 0.82rem;
    transition: all 0.25s ease;
}

.contact-link:hover {
    background: var(--surface2);
    border-color: var(--accent);
    color: var(--white);
}

.contact-link i:first-child {
    width: 18px;
    text-align: center;
    color: var(--accent);
    font-size: 0.9rem;
}

.contact-link span { flex: 1; }

.contact-link .arrow {
    font-size: 0.65rem;
    opacity: 0;
    transform: translateX(-4px);
    transition: all 0.2s ease;
    color: var(--accent2);
}

.contact-link:hover .arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ===========================
   RIGHT COLUMN
=========================== */
.right-column {
    flex: 1;
    min-width: 0;
    animation: slideInRight 0.6s ease both 0.1s;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ===========================
   TABS
=========================== */
.tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 6px;
}

.tab-button {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 16px;
    cursor: pointer;
    border-radius: 8px;
    color: var(--text-dim);
    transition: all 0.25s ease;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.tab-button .tab-num {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent);
    opacity: 0.6;
}

.tab-button.active {
    background: var(--surface2);
    color: var(--white);
    box-shadow: inset 0 0 0 1px var(--border);
}

.tab-button.active .tab-num { opacity: 1; }

.tab-button:hover:not(.active) {
    color: var(--text);
    background: rgba(255,255,255,0.03);
}

/* ===========================
   CONTENT PANEL
=========================== */
.content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px;
    min-height: 500px;
}

.tab-content { display: none; }
.tab-content.active {
    display: block;
    animation: fadeUp 0.35s ease both;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===========================
   SHARED SECTION PARTS
=========================== */
.intro-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent2);
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 28px;
    letter-spacing: -0.5px;
}

.section-title .highlight {
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===========================
   SOBRE SECTION
=========================== */
.sobre-header { margin-bottom: 28px; }

.stats-row {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    flex: 1;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    transition: border-color 0.2s;
}

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

.stat-num {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.72rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.about-text p {
    margin-bottom: 16px;
    font-size: 0.92rem;
    color: var(--text);
    line-height: 1.8;
}

.about-text p:last-child { margin-bottom: 0; }

.about-text strong.white { color: var(--white); }
.about-text strong.accent { color: var(--accent); }

/* ===========================
   PROJECTS SECTION
=========================== */
.project-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.project {
    display: block;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    color: inherit;
}

.project:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 212, 255, 0.08);
}

.project-img-wrap {
    position: relative;
    overflow: hidden;
    height: 160px;
}

.project-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.project:hover .project-img-wrap img {
    transform: scale(1.06);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,212,255,0.15);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project:hover .project-overlay { opacity: 1; }

.project-overlay span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--white);
    letter-spacing: 1px;
}

.project-info {
    padding: 16px;
}

.project-tags {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--accent2);
    background: rgba(0,255,157,0.08);
    border: 1px solid rgba(0,255,157,0.2);
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.project-info h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 6px;
}

.project-info p {
    font-size: 0.78rem;
    color: var(--text-dim);
    line-height: 1.6;
}

/* ===========================
   MEDIUM / ARTICLES SECTION
=========================== */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.article-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.25s ease;
    color: inherit;
}

.article-card:hover {
    border-color: var(--accent);
    transform: translateX(6px);
}

.article-num {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--surface3);
    flex-shrink: 0;
    min-width: 36px;
}

.article-card:hover .article-num { color: var(--accent); }

.article-body { flex: 1; }

.article-body h4 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 4px;
    line-height: 1.4;
}

.article-body p {
    font-size: 0.76rem;
    color: var(--text-dim);
}

.article-arrow {
    font-size: 0.75rem;
    color: var(--text-dim);
    transition: all 0.25s ease;
}

.article-card:hover .article-arrow {
    color: var(--accent);
    transform: translateX(4px);
}

/* ===========================
   CERTS SECTION
=========================== */
.certs-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.cert-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px 20px;
    transition: all 0.25s ease;
    color: inherit;
}

.cert-card:hover {
    border-color: var(--accent2);
    transform: translateX(6px);
}

.cert-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(0,255,157,0.08);
    border: 1px solid rgba(0,255,157,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--accent2);
    font-size: 0.9rem;
}

.cert-body { flex: 1; }

.cert-body h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--white);
}

.cert-link {
    font-size: 0.7rem;
    color: var(--text-dim);
    transition: color 0.2s;
}

.cert-card:hover .cert-link { color: var(--accent2); }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
        margin: 20px;
        padding: 0;
        gap: 20px;
    }

    .left-column {
        width: 100%;
        position: static;
    }

    .profile-wrap { justify-content: center; }
    .name-block { text-align: center; }

    .tools {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .tool-item { flex: none; }

    .contacts { flex-direction: row; flex-wrap: wrap; }
    .contact-link { flex: none; }
}

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

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

    .stats-row {
        gap: 10px;
    }

    .stat-card { padding: 12px 8px; }
    .stat-num  { font-size: 1.2rem; }

    .section-title { font-size: 1.4rem; }

    .tabs { flex-wrap: wrap; }
    .tab-button { flex: none; }
}

@media (max-width: 480px) {
    .content { padding: 18px; }

    .tab-button .tab-num { display: none; }

    .article-num { display: none; }
}