/* ===== CSS Variables ===== */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #0f3460;
    --bg-card-hover: #1a4a7a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0b0;
    --accent: #00d4aa;
    --accent-hover: #00f5c4;
    --accent-dim: rgba(0, 212, 170, 0.15);
    --sidebar-bg: #0d1117;
    --sidebar-width: 220px;
    --border-color: #2a2a4a;
    --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 20px;
}

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* ===== Sidebar ===== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 30px 20px 20px;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

.terminal-prompt {
    color: var(--accent);
    font-weight: 700;
}

.sidebar-name {
    color: var(--text-primary);
    font-weight: 500;
}

.sidebar-nav {
    list-style: none;
    padding: 20px 0;
    flex: 1;
}

.sidebar-nav li {
    margin: 0;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
    color: var(--accent);
    background: var(--accent-dim);
    border-left-color: var(--accent);
}

.sidebar-nav .nav-link i {
    width: 18px;
    text-align: center;
    font-size: 0.9rem;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.social-links {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

/* ===== Hamburger Toggle (Mobile) ===== */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1100;
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.sidebar-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
    border-radius: 2px;
}

.sidebar-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.sidebar-toggle.active span:nth-child(2) {
    opacity: 0;
}
.sidebar-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 999;
}

/* ===== Main Content ===== */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 0;
    min-height: 100vh;
}

/* ===== Sections ===== */
.section {
    padding: 80px 60px;
    min-height: 100vh;
    border-bottom: 1px solid var(--border-color);
}

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

.section-header {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    margin-bottom: 40px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

/* ===== Terminal Styling ===== */
.prompt {
    color: var(--accent);
    font-family: var(--font-mono);
    font-weight: 700;
}

.command {
    color: #f0f0f0;
    font-family: var(--font-mono);
    font-weight: 500;
}

.terminal-window {
    background: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 30px;
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(0,0,0,0.3);
    border-bottom: 1px solid var(--border-color);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.terminal-dot.red { background: #ff5f56; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #27c93f; }

.terminal-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-left: 8px;
}

.terminal-body {
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.8;
}

.terminal-body .command {
    margin-left: 8px;
}

.terminal-output {
    color: var(--text-secondary);
    margin-top: 10px;
    padding-left: 0;
}

.terminal-line {
    font-family: var(--font-mono);
    font-size: 1rem;
    margin-bottom: 12px;
}

.terminal-line .command {
    margin-left: 8px;
}

/* ===== Hero ===== */
.hero-area {
    margin-bottom: 40px;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-top: 8px;
    margin-bottom: 8px;
}

.accent {
    color: var(--accent) !important;
}

.hero-title {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Typing cursor effect */
.typing-effect::after {
    content: '|';
    color: var(--accent);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* ===== About Details ===== */
.about-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

.detail-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.detail-item i {
    font-size: 1.4rem;
    margin-top: 2px;
}

.detail-item strong {
    display: block;
    margin-bottom: 2px;
}

.detail-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.date-badge {
    display: inline-block;
    background: var(--accent-dim);
    color: var(--accent);
    padding: 2px 10px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    margin-top: 4px;
}

/* ===== Download Button ===== */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    background: var(--accent);
    color: var(--bg-primary);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    border-radius: 6px;
    transition: var(--transition);
    border: 2px solid var(--accent);
}

.btn-download:hover {
    background: transparent;
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-dim);
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 14px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

.timeline-marker {
    position: absolute;
    left: -33px;
    top: 20px;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 10px var(--accent-dim);
}

/* ===== Card ===== */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    transition: var(--transition);
}

.card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 170, 0.08);
}

.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
}

.card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.company {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 14px;
}

.company i {
    color: var(--accent);
    margin-right: 6px;
}

.experience-list {
    list-style: none;
    padding: 0;
}

.experience-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.experience-list li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-family: var(--font-mono);
    font-weight: 700;
}

/* ===== Projects Grid ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.project-card {
    display: flex;
    flex-direction: column;
}

.project-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 14px;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.project-card ul {
    list-style: none;
    padding: 0;
    margin-bottom: 16px;
    flex: 1;
}

.project-card ul li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.project-card ul li::before {
    content: '~';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-family: var(--font-mono);
    font-weight: 700;
}

/* ===== Tech Tags ===== */
.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.tag {
    display: inline-block;
    background: var(--accent-dim);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid rgba(0, 212, 170, 0.2);
}

/* ===== Certifications ===== */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.cert-card {
    display: flex;
    align-items: center;
    gap: 20px;
}

.cert-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.cert-info h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.cert-issuer {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 6px;
}

.cert-issuer i {
    color: var(--accent);
    margin-right: 6px;
}

/* ===== Tech Stack Grid ===== */
.techstack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.techstack-category h3 {
    font-size: 1rem;
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.techstack-category h3 i {
    margin-right: 8px;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 60px;
}

.contact-card {
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    padding: 32px 24px;
}

.contact-card i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 14px;
}

.contact-card h3 {
    margin-bottom: 8px;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    word-break: break-all;
}

.footer-bar {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeInUp 0.6s ease-out;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: flex;
    }

    .sidebar-overlay.active {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .section {
        padding: 60px 20px;
        min-height: auto;
    }

    .hero-name {
        font-size: 2.2rem;
    }

    .projects-grid,
    .certifications-grid,
    .techstack-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .card-header-row {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 1.8rem;
    }

    .section {
        padding: 40px 16px;
    }
}