/* ===========================================
   LAYOUT & COMPONENT STYLES
   =========================================== */

/* ===== HEADER & NAV ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--header-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    transition: all var(--transition-base);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    color: var(--text-secondary);
    transition: color var(--transition-base);
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition-base);
}

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

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

.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    width: 100%;
}

/* Navigation Dropdown */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-toggle i {
    font-size: 0.75rem;
    transition: transform var(--transition-base);
}

.nav-dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 0.5rem;
    min-width: 200px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 100;
    padding: 0.5rem 0;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    margin-top: 1rem;
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    padding-left: 2rem;
}

/* Contact CTA Button */
.nav-cta {
    padding: 0.5rem 1.5rem !important;
    background: var(--accent-gradient);
    color: white !important;
    border-radius: var(--radius-md);
    font-weight: 600;
}

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

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--accent-glow);
}


/* Hamburger Menu Button */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: all 0.3s ease;
    display: block;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}


/* Theme Toggle Button - FIXED VISIBILITY */
#theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: all var(--transition-base);
    cursor: pointer;
}

#theme-toggle:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: rotate(180deg);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
}

.hero-content {
    max-width: 800px;
    z-index: 2;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-lg);
    color: var(--accent-primary);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.hero-tagline {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.hero-desc {
    font-size: var(--font-lg);
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.social-btn {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.social-btn:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 5px 20px var(--accent-glow);
}

/* CTA Buttons */
.btn-primary {
    display: inline-block;
    padding: 0.875rem 2rem;
    background: var(--accent-gradient);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
    color: white;
}

.btn-outline {
    display: inline-block;
    padding: 0.875rem 2rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ===== ABOUT SECTION ===== */
.about-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 4rem;
    align-items: center;
}

.profile-img-container {
    position: relative;
}

.profile-img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    border: 3px solid var(--border-color);
    transition: transform var(--transition-base);
}

.profile-img:hover {
    transform: scale(1.02);
}

/* ===== TIMELINE (Experience & Education) ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 3px;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
}

.timeline-item {
    margin-bottom: 2.5rem;
    padding-left: 2.5rem;
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: -7px;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 3px var(--accent-primary);
}

.timeline-item h3 {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.timeline-item .date {
    color: var(--accent-primary);
    font-size: var(--font-sm);
    font-weight: 600;
}

.timeline-item p,
.timeline-item ul {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.timeline-item ul {
    margin-left: 1.25rem;
    list-style: disc;
}

/* ===== CARDS (Projects, Skills, etc.) ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--accent-primary);
}

/* Project Card with Video */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.project-content {
    padding: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.project-tag,
.feature-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    font-size: var(--font-xs);
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    font-weight: 500;
    font-size: var(--font-sm);
}

.project-link:hover {
    color: var(--accent-secondary);
}

/* ===== CERTIFICATIONS HORIZONTAL SCROLL ===== */
.certs-scroll-container {
    position: relative;
    margin: 2rem 0;
}

.certs-scroll {
    display: flex;
    gap: 1.5rem;
    overflow-x: auto;
    padding: 1rem 0.5rem 1.5rem;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) var(--bg-tertiary);
}

.certs-scroll::-webkit-scrollbar {
    height: 8px;
}

.certs-scroll::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.certs-scroll::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: var(--radius-full);
}

.cert-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition-base);
}

.cert-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--accent-primary);
}

.cert-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1rem;
}

.cert-card h4 {
    font-size: var(--font-base);
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.cert-card p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.cert-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--accent-primary);
    font-size: var(--font-sm);
    font-weight: 500;
}

/* ===== CHATBOT WIDGET ===== */
.chatbot-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
}

.chatbot-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 5px 20px var(--accent-glow);
    cursor: pointer;
    transition: all var(--transition-base);
}

.chatbot-toggle:hover {
    transform: scale(1.1);
}

.chatbot-window {
    position: absolute;
    bottom: 5rem;
    right: 0;
    width: 380px;
    height: 500px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform-origin: bottom right;
    transition: all var(--transition-base);
    opacity: 0;
    transform: scale(0.9) translateY(20px);
    pointer-events: none;
}

.chatbot-window.open {
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: all;
}

.chat-header {
    padding: 1rem 1.5rem;
    background: var(--accent-gradient);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    font-size: var(--font-base);
    font-weight: 600;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    background: var(--bg-secondary);
}

.chat-input-area {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
    background: var(--bg-card);
}

.chat-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-sm);
}

.chat-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

#sendMessage {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--accent-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== FOOTER ===== */
footer {
    padding: 3rem 0;
    background: var(--bg-secondary);
    text-align: center;
    border-top: 1px solid var(--border-color);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
}

/* ===== ANIMATIONS ===== */
/* AOS-like animations */
[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translate(0);
}

/* ===== RESPONSIVE ===== */

/* Tablet and below */
@media (max-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .profile-img-container {
        max-width: 300px;
        margin: 0 auto;
    }

    .card-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-item {
        padding-left: 2rem;
    }
}

/* Small laptops, tablets, and mobile */
@media (max-width: 1100px) {

    /* Hamburger Menu */
    .hamburger {
        display: flex;
    }

    /* Mobile Navigation */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-card);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
        transition: right 0.3s ease;
        z-index: 1000;
        overflow-y: auto;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-link {
        width: 100%;
        padding: 0.75rem 0;
        font-size: 1.1rem;
        text-align: left;
    }

    .nav-link::after {
        display: none;
    }

    /* Mobile Dropdown Styles */
    .nav-dropdown {
        width: 100%;
    }

    .dropdown-toggle {
        width: 100%;
        justify-content: flex-start;
        padding: 0.75rem 0;
        font-size: 1.1rem;
        text-align: left;
        color: var(--text-primary);
        font-weight: 600;
        border-bottom: 1px solid var(--border-color);
        margin-bottom: 0.5rem;
    }

    .dropdown-toggle i {
        margin-left: auto;
    }

    .dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        margin: 0;
        padding: 0;
        border: none;
        box-shadow: none;
        background: transparent;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
        margin-bottom: 1rem;
    }

    .dropdown-item {
        padding: 0.5rem 0 0.5rem 1rem;
        font-size: 1rem;
        border-left: 2px solid var(--border-color);
    }

    .dropdown-item:hover {
        padding-left: 1.5rem;
        border-left-color: var(--accent-primary);
    }

    /* Mobile CTA */
    .nav-cta {
        margin-top: 1rem;
        text-align: center;
        padding: 0.875rem 1.5rem !important;
    }


    /* Mobile overlay */
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
    }

    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    /* Hero adjustments */
    .hero {
        padding-top: 100px;
        min-height: auto;
        padding-bottom: 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-tagline {
        font-size: 1.5rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    /* Cards */
    .card-grid {
        grid-template-columns: 1fr;
    }

    /* Chatbot */
    .chatbot-window {
        width: calc(100vw - 2rem);
        right: -1rem;
        height: 450px;
    }

    .chatbot-widget {
        bottom: 1rem;
        right: 1rem;
    }

    .chatbot-toggle {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    /* Sections */
    .section {
        padding: 3rem 0;
    }

    /* Buttons */
    .btn-primary,
    .btn-outline {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    /* Social buttons */
    .social-btn {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }

    /* Certification cards */
    .cert-card {
        flex: 0 0 250px;
    }
}

/* Small mobile devices */
@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .header {
        padding: 0.75rem 0;
    }

    .logo {
        font-size: 1.5rem;
    }

    .nav-links {
        width: 100%;
        right: -100%;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 1.25rem;
    }

    .hero-desc {
        font-size: 0.95rem;
    }

    .heading-2 {
        font-size: 1.75rem;
    }

    .heading-3 {
        font-size: 1.25rem;
    }

    .social-links {
        gap: 0.75rem;
    }

    .social-btn {
        width: 2.25rem;
        height: 2.25rem;
        font-size: 0.9rem;
    }

    .btn-primary,
    .btn-outline {
        padding: 0.65rem 1.25rem;
        font-size: 0.85rem;
    }

    .card {
        padding: 1.25rem;
    }

    .project-content {
        padding: 1.25rem;
    }

    .cert-card {
        flex: 0 0 220px;
        padding: 1.25rem;
    }

    .timeline-item {
        padding-left: 1.5rem;
        margin-bottom: 2rem;
    }

    .timeline::before {
        left: 5px;
    }

    .timeline-dot {
        left: -5px;
        width: 14px;
        height: 14px;
    }

    .chatbot-window {
        width: calc(100vw - 1rem);
        height: 400px;
    }
}

/* Very small devices */
@media (max-width: 360px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .heading-2 {
        font-size: 1.5rem;
    }

    .card-grid {
        gap: 1.5rem;
    }

    .cert-card {
        flex: 0 0 200px;
    }
}