:root {
    --bg-dark: #080C14;
    --card-bg: #0F172A;
    --card-border: rgba(59, 130, 246, 0.18);
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --primary-blue: #3B82F6;
    --cyan-glow: #06B6D4;
    --blue-glow-rgba: rgba(59, 130, 246, 0.25);
}

[data-theme="light"] {
    --bg-dark: #F8FAFC;
    --card-bg: #FFFFFF;
    --card-border: rgba(59, 130, 246, 0.25);
    --text-main: #0F172A;
    --text-muted: #64748B;
    --primary-blue: #2563EB;
    --cyan-glow: #0284C7;
    --blue-glow-rgba: rgba(37, 99, 235, 0.12);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Plus Jakarta Sans', sans-serif;
    scroll-behavior: smooth;
    word-break: break-word;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

/* GLOW CURSOR */
.cursor-dot {
    width: 8px;
    height: 8px;
    background-color: var(--cyan-glow);
    position: fixed;
    top: 0;
    left: 0;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.1s ease-out;
}

.cursor-outline {
    width: 36px;
    height: 36px;
    border: 1.5px solid var(--primary-blue);
    box-shadow: 0 0 15px var(--blue-glow-rgba);
    position: fixed;
    top: 0;
    left: 0;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    transition: transform 0.18s ease-out, width 0.2s, height 0.2s, border-color 0.2s;
    transform: translate(-50%, -50%);
}

body.hovered .cursor-outline {
    width: 55px;
    height: 55px;
    border-color: var(--cyan-glow);
    background: rgba(6, 182, 212, 0.08);
}

/* NAVIGATION BAR */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    background: rgba(8, 12, 20, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    padding: 16px 24px;
}

[data-theme="light"] nav {
    background: rgba(248, 250, 252, 0.85);
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 18px;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
}

.logo span { color: var(--primary-blue); }

.nav-links {
    display: none;
    gap: 24px;
    list-style: none;
}

@media (min-width: 768px) {
    .nav-links { display: flex; }
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 16px;
    border-radius: 8px;
    font-size: 12.5px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s ease;
    cursor: pointer;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    color: var(--text-main);
}

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

.btn-primary {
    background: var(--primary-blue);
    color: white !important;
    border-color: var(--primary-blue);
    box-shadow: 0 4px 20px var(--blue-glow-rgba);
}

.btn-primary:hover {
    background: #2563EB;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.4);
}

/* CONTAINER & SECTIONS */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

section { padding: 60px 0; }

.badge-sub {
    display: inline-block;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-blue);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
    border: 1px solid rgba(59, 130, 246, 0.25);
}

.section-title {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 10px;
}

.section-desc {
    color: var(--text-muted);
    font-size: 13.5px;
    max-width: 600px;
    margin-bottom: 32px;
}

/* HERO SECTION */
.hero {
    padding-top: 130px;
    padding-bottom: 40px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 850px) {
    .hero { grid-template-columns: 1.2fr 0.8fr; }
}

.hero-title-typing {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 16px;
    min-height: 90px;
}

@media (min-width: 640px) {
    .hero-title-typing { font-size: 44px; }
}

.hero-title-typing span.typed-text {
    background: linear-gradient(135deg, var(--primary-blue), var(--cyan-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.cursor-blink {
    display: inline-block;
    width: 3px;
    background-color: var(--primary-blue);
    animation: blink 0.8s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.hero-desc {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
    line-height: 1.6;
}

.contact-list-hero {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 28px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.contact-item a {
    color: var(--text-main);
    text-decoration: none;
}

.contact-item a:hover {
    color: var(--primary-blue);
    text-decoration: underline;
}

.hero-btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.tech-icons-strip {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding-top: 20px;
    border-top: 1px solid var(--card-border);
}

.tech-icons-strip span {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
}

.tech-icons-strip i {
    font-size: 22px;
    transition: transform 0.2s;
}

.tech-icons-strip i:hover { transform: translateY(-3px); }

/* HERO VISUAL AVATAR & CODE BOX */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
}

.avatar-glow {
    position: relative;
    width: 270px;
    height: 270px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--blue-glow-rgba) 0%, rgba(8, 12, 20, 0) 70%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-glow img {
    width: 230px;
    height: 230px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary-blue);
    box-shadow: 0 0 30px var(--blue-glow-rgba);
}

.code-snippet {
    position: absolute;
    bottom: -10px;
    right: -10px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 12px 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-main);
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    backdrop-filter: blur(8px);
    display: none;
}

@media (min-width: 500px) { .code-snippet { display: block; } }

.code-snippet .keyword { color: #F472B6; }
.code-snippet .var { color: #60A5FA; }
.code-snippet .string { color: #34D399; }

/* TECH TOOLKIT CARDS & BADGES */
.tech-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 768px) {
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
}

.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 20px;
    transition: border-color 0.25s, transform 0.25s;
}

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

.tech-card h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.tag {
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    transition: all 0.2s ease;
}

.tag i { font-size: 14px; }

.tag:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--primary-blue);
    color: #FFFFFF;
}

/* SQL PLAYGROUND SECTION */
.sql-box {
    background: #0D1117;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    overflow: hidden;
    font-family: 'JetBrains Mono', monospace;
}

.sql-header {
    background: #161B22;
    padding: 10px 16px;
    display: flex;
    gap: 8px;
    align-items: center;
    border-bottom: 1px solid var(--card-border);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.red { background: #FF5F56; }
.yellow { background: #FFBD2E; }
.green { background: #27C93F; }

.sql-body {
    padding: 20px;
    font-size: 12.5px;
    color: #C9D1D9;
}

.sql-btn-group {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.sql-btn {
    background: #21262D;
    color: #C9D1D9;
    border: 1px solid rgba(255,255,255,0.1);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s;
}

.sql-btn.active, .sql-btn:hover {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

.sql-code {
    color: #7EE787;
    margin-bottom: 14px;
    min-height: 45px;
    white-space: pre-wrap;
}

.sql-result {
    background: #161B22;
    border-radius: 6px;
    padding: 12px;
    font-size: 11.5px;
    color: #8B949E;
    border: 1px solid rgba(255,255,255,0.05);
}

/* CARDS & EXPERIENCES */
.card-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.25s, transform 0.25s;
}

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

.card-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

@media (min-width: 640px) {
    .card-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: baseline;
    }
}

.card-title {
    font-weight: 700;
    font-size: 15px;
    color: var(--text-main);
}

.card-date {
    font-size: 11.5px;
    color: var(--primary-blue);
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}

.card-sub {
    font-size: 12.5px;
    color: var(--text-muted);
    font-weight: 600;
}

.card-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

.card-desc ul { padding-left: 18px; }

.project-actions {
    display: flex;
    gap: 10px;
    margin-top: 6px;
}

/* LANGUAGES SECTION */
.lang-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

@media (min-width: 640px) {
    .lang-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
    .lang-grid { grid-template-columns: repeat(6, 1fr); }
}

.lang-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 14px 10px;
    text-align: center;
}

.lang-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-main);
}

.lang-level {
    font-size: 11px;
    color: var(--primary-blue);
    font-weight: 600;
    margin-top: 4px;
}

/* CERTIFICATES & LIGHTBOX */
.cert-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 640px) {
    .cert-grid { grid-template-columns: repeat(2, 1fr); }
}

.cert-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color 0.25s;
}

.cert-card:hover { border-color: var(--primary-blue); }

.cert-img-container {
    width: 100%;
    height: 160px;
    background: #1E293B;
    border-bottom: 1px solid var(--card-border);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.cert-img-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.cert-img-container:hover img { transform: scale(1.05); }

.cert-info {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex-grow: 1;
}

.cert-title { font-size: 14px; font-weight: 700; }
.cert-issuer { font-size: 11.5px; color: var(--primary-blue); font-weight: 600; }
.cert-learned { font-size: 12px; color: var(--text-muted); margin-top: 4px; line-height: 1.4; }

/* MODAL LIGHTBOX */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    justify-content: center;
    align-items: center;
    padding: 20px;
    backdrop-filter: blur(6px);
}

.modal-content {
    max-width: 90%;
    max-height: 85vh;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 25px;
    color: #fff;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
}

footer {
    margin-top: 40px;
    padding: 30px 0;
    border-top: 1px solid var(--card-border);
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}