/*
* Portfolio Website - Main Stylesheet
* A fully responsive, animated 3D portfolio with theme switching
* Version: 1.0
* Last Modified: August 24, 2025
*/

/* ============================================
   Table of Contents:
   1. Reset & Base Styles
   2. Typography
   3. Layout & Grid
   4. Navigation
   5. Sections
   6. Buttons
   7. Cards & Components
   8. Forms
   9. Animations
   10. Media Queries
============================================ */

/* ============================================
   1. Reset & Base Styles
============================================ */
:root {
    /* Font families */
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Montserrat', sans-serif;
    --font-mono: 'Fira Code', monospace;

    /* Base sizes */
    --base-font-size: 16px;
    --base-line-height: 1.6;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;

    /* Border radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-round: 50%;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Z-index layers */
    --z-background: -10;
    --z-default: 1;
    --z-header: 100;
    --z-overlay: 200;
    --z-modal: 300;
    --z-loader: 1000;

    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;

    /* Theme colors set in themes.css */
}

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

html {
    font-size: var(--base-font-size);
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary), 'Arial', sans-serif;
    line-height: var(--base-line-height, 1.6);
    background-color: var(--color-background);
    color: var(--color-text);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    opacity: 1 !important;
    visibility: visible !important;
}

/* Ensure content visibility immediately */
body, body * {
    opacity: 1 !important;
    visibility: visible !important;
}

/* Remove any loading states immediately */
body.loading {
    opacity: 1 !important;
}

img, svg, video {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

a {
    text-decoration: none;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
}

::selection {
    background-color: var(--color-primary-transparent);
    color: var(--color-primary);
}

/* ============================================
   2. Typography
============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-heading);
    transition: color var(--transition-normal);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 2rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-md);
}

.text-center {
    text-align: center;
}

.text-highlight {
    color: var(--color-primary);
}

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 60px;
    height: 4px;
    background: var(--color-primary);
    border-radius: var(--border-radius-sm);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   3. Layout & Grid
============================================ */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    position: relative;
    padding: var(--spacing-xxl) 0;
}

.section-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col {
    flex: 1;
    padding: 0 15px;
}

/* Grid system */
.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-gap: 30px;
}

/* Two column layout */
.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-gap: 40px;
}

@media (max-width: 768px) {
    .two-columns {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   4. Navigation
============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-header);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
    padding: 1rem 0;
}

.header.scrolled {
    background-color: var(--color-background-alt);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-family: var(--font-secondary);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.nav-items {
    display: flex;
    align-items: center;
}

.nav-items ul {
    display: flex;
}

.nav-items li {
    margin-left: var(--spacing-md);
}

.nav-link {
    position: relative;
    font-weight: 500;
    padding: 0.5rem;
    color: var(--color-text);
}

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

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

.theme-switcher {
    display: flex;
    align-items: center;
    margin-left: var(--spacing-lg);
}

.theme-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.3rem;
    color: var(--color-text-light);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.theme-btn:hover {
    color: var(--color-primary);
    transform: scale(1.2);
}

.theme-btn.active {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--color-text);
    border-radius: 3px;
    transition: all 0.3s ease;
}

@media (max-width: 992px) {
    .nav-toggle {
        display: flex;
    }

    .nav-items {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background-color: var(--color-background-alt);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        justify-content: flex-start;
        padding: var(--spacing-xxl) var(--spacing-lg);
        transition: right var(--transition-normal);
    }

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

    .nav-items ul {
        flex-direction: column;
        width: 100%;
    }

    .nav-items li {
        margin: var(--spacing-sm) 0;
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm) 0;
    }

    .theme-switcher {
        margin: var(--spacing-lg) 0 0 0;
    }
}

/* ============================================
   5. Sections
============================================ */

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-background);
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-canvas-container canvas {
    width: 100% !important;
    height: 100% !important;
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-content {
    position: relative;
    z-index: var(--z-default);
    max-width: 700px;
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-title {
    margin-bottom: var(--spacing-lg);
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-title .greeting {
    display: block;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-title .name {
    display: block;
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: var(--color-primary); /* Fallback color */
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-title .profession {
    display: block;
    font-size: 2rem;
    color: var(--color-heading);
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-description {
    font-size: 1.2rem;
    max-width: 500px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    opacity: 1 !important;
    visibility: visible !important;
}

.hero-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    opacity: 1 !important;
    visibility: visible !important;
}

/* Hero social styles moved to glassmorphism.css */

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0.7;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.scroll-indicator:hover {
    opacity: 1;
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--color-text);
    border-radius: 20px;
    position: relative;
}

.wheel {
    background-color: var(--color-text);
    width: 6px;
    height: 10px;
    border-radius: 3px;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    animation: mouse-wheel 1.5s ease infinite;
}

.arrow-down {
    margin-top: 10px;
    animation: bounce 1.5s infinite;
}

.arrow-down span {
    display: block;
    width: 10px;
    height: 10px;
    border-bottom: 2px solid var(--color-text);
    border-right: 2px solid var(--color-text);
    transform: rotate(45deg);
    margin: -5px;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    grid-gap: var(--spacing-xl);
    align-items: center;
}

.about-image {
    position: relative;
}

.image-container {
    position: relative;
    z-index: 2;
}

.profile-placeholder {
    width: 300px;
    height: 300px;
    background: var(--color-surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-primary);
    margin: 0 auto;
}

.profile-icon {
    font-size: 4rem;
    color: var(--color-text-muted);
}

.profile-img {
    width: 100%;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.image-decoration {
    position: absolute;
    z-index: 1;
    top: -20px;
    left: -20px;
    width: 80%;
    height: 80%;
    border: 5px solid var(--color-primary);
    border-radius: var(--border-radius-lg);
}

.about-text p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.detail-item {
    margin-bottom: var(--spacing-sm);
}

.detail-label {
    font-weight: 700;
    color: var(--color-primary);
    margin-right: var(--spacing-sm);
}

/* Skills Section */
.skills-categories {
    max-width: 800px;
    margin: 0 auto;
}

.category-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.category-tab {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.category-tab::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 0;
    height: 3px;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

.category-tab:hover {
    color: var(--color-primary);
}

.category-tab.active {
    color: var(--color-primary);
}

.category-tab.active::after {
    width: 100%;
}

.skills-category {
    display: none;
}

.skills-category.active {
    display: block;
    animation: fadeIn 0.5s ease forwards;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    grid-gap: var(--spacing-lg);
}

.skill-card {
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.skill-icon {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.skill-name {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.skill-level {
    width: 100%;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 4px;
    width: 0;
    transition: width 1.5s ease;
}

/* Projects Section */
.project-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.filter-btn {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 0 var(--spacing-xs);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    transition: all var(--transition-normal);
    border-radius: var(--border-radius-sm);
}

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

.filter-btn.active {
    color: var(--color-background);
    background-color: var(--color-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    grid-gap: var(--spacing-xl);
}

.project-card {
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

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

.project-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: 500;
}

.project-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.project-img {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1s ease;
}

.project-card:hover .project-img img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border-radius: var(--border-radius-round);
    background-color: var(--color-primary);
    color: var(--color-background) !important;
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

.project-link:hover {
    background-color: var(--color-background);
    color: var(--color-primary) !important;
    transform: translateY(-3px);
}

.project-info {
    padding: var(--spacing-lg);
}

.project-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.project-description {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-tag {
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    background-color: var(--color-background);
    color: var(--color-text-light);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-normal);
}

.projects-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* Experience Section */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--color-border);
    left: 50%;
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-primary);
    z-index: 1;
    border: 4px solid var(--color-background);
}

.timeline-content {
    position: relative;
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    width: 45%;
}

.timeline-item:nth-child(odd) .timeline-content {
    left: 55%;
}

.timeline-item:nth-child(even) .timeline-content {
    right: 55%;
    margin-left: auto;
}

.timeline-date {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.timeline-description {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

/* Contact Section */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
}

.contact-item {
    display: flex;
    margin-bottom: var(--spacing-lg);
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-right: var(--spacing-md);
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-round);
    background-color: var(--color-background-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.contact-item:hover .contact-icon {
    background-color: var(--color-primary);
    color: var(--color-background);
    transform: scale(1.1);
}

.contact-text h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.contact-social {
    display: flex;
    gap: var(--spacing-sm);
}

.contact-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
    border-radius: var(--border-radius-round);
    background-color: var(--color-background-alt);
    color: var(--color-text);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.contact-social a:hover {
    background-color: var(--color-primary);
    color: var(--color-background);
    transform: translateY(-3px);
}

.contact-form-container {
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    font-family: var(--font-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    background-color: var(--color-background);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* Footer Section */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: var(--spacing-xl) 0;
}

.footer-content {
    text-align: center;
}

.footer-logo {
    margin-bottom: var(--spacing-md);
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-round);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-footer-text);
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

.footer-social a:hover {
    background-color: var(--color-primary);
    color: var(--color-background);
    transform: translateY(-3px);
}

.footer-nav {
    margin-bottom: var(--spacing-lg);
}

.footer-nav ul {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-nav a {
    color: var(--color-footer-text);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   6. Buttons
============================================ */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn i {
    margin-right: var(--spacing-xs);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-background);
    border: 2px solid var(--color-primary);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: all 0.6s;
    z-index: -1;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-background-alt);
    border-color: var(--color-text);
    transform: translateY(-3px);
}

/* ============================================
   7. Cards & Components
============================================ */
/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    color: #ffffff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal);
    z-index: var(--z-overlay);
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(0);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Mouse Trail Canvas */
.mouse-trail-canvas {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 9999;
}

/* Loader */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-background);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loader);
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-progress {
    width: 200px;
    height: 5px;
    background-color: var(--color-border);
    border-radius: 3px;
    margin-bottom: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.loader-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background-color: var(--color-primary);
    animation: loading 2s ease infinite;
    border-radius: 3px;
}

.loader-text {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--color-text);
}

/* Theme Panel */
.theme-panel {
    position: fixed;
    top: 50%;
    right: -300px;
    transform: translateY(-50%);
    width: 300px;
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    z-index: var(--z-overlay);
    transition: right var(--transition-normal);
}

.theme-panel.active {
    right: 0;
}

.theme-panel-toggle {
    position: absolute;
    top: 50%;
    left: -50px;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-primary);
    cursor: pointer;
    box-shadow: -5px 0 10px rgba(0, 0, 0, 0.05);
    transition: color var(--transition-fast);
}

.theme-panel-toggle:hover {
    color: var(--color-primary-dark);
}

.theme-panel-content {
    padding: var(--spacing-lg);
}

.theme-panel-content h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.theme-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.theme-option {
    background-color: var(--color-background-alt);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-option:hover {
    background-color: var(--color-border);
}

.theme-option.active {
    background-color: var(--color-primary);
    color: var(--color-background);
}

.theme-circle {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    margin-right: var(--spacing-sm);
}

.theme-option[data-theme="light"] .theme-circle {
    background-color: #f5f5f5;
    border: 1px solid #ddd;
}

.theme-option[data-theme="dark"] .theme-circle {
    background-color: #222;
    border: 1px solid #444;
}

.theme-option[data-theme="neon"] .theme-circle {
    background: linear-gradient(45deg, #00f0ff, #00ff8f);
    border: none;
}

.theme-option[data-theme="minimal"] .theme-circle {
    background-color: #fff;
    border: 1px solid #333;
}

.animation-speed {
    margin-bottom: var(--spacing-lg);
}

input[type="range"] {
    width: 100%;
    margin: var(--spacing-sm) 0;
    background-color: var(--color-background-alt);
    appearance: none;
    height: 5px;
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-primary);
    cursor: pointer;
}

.speed-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.background-toggle {
    display: flex;
    align-items: center;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
    margin-right: var(--spacing-md);
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 2px;
    background-color: var(--color-background);
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--color-primary);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

/* ============================================
   8. Forms
============================================ */
form button[type="submit"] {
    width: 100%;
}

/* ============================================
   9. Animations
============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes mouse-wheel {
    0% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(15px);
        opacity: 0;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

@keyframes loading {
    0% {
        width: 0;
    }
    50% {
        width: 100%;
    }
    100% {
        width: 0;
        left: 100%;
    }
}

[data-animation] {
    opacity: 1 !important; /* Force visibility immediately */
    transition: all 0.8s cubic-bezier(0.25, 0.1, 0.25, 1);
}

[data-animation="fade-up"] {
    transform: translateY(0px); /* Remove initial transform */
}

[data-animation="fade-down"] {
    transform: translateY(0px); /* Remove initial transform */
}

[data-animation="fade-left"] {
    transform: translateX(0px); /* Remove initial transform */
}

[data-animation="fade-right"] {
    transform: translateX(0px); /* Remove initial transform */
}

[data-animation="zoom-in"] {
    transform: scale(1); /* Remove initial transform */
}

[data-animation].animated {
    opacity: 1;
    transform: translate(0) scale(1);
}

/* ============================================
   10. Certificates Section
============================================ */

.certificates {
    padding: var(--spacing-xxl) 0;
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.certificate-card {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.certificate-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.certificate-image {
    position: relative;
    overflow: hidden;
    height: 200px;
}

.certificate-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.certificate-card:hover .certificate-image img {
    transform: scale(1.1);
}

.certificate-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(106, 125, 254, 0.8), rgba(255, 107, 107, 0.8));
    opacity: 0;
    transition: opacity var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.certificate-card:hover .certificate-overlay {
    opacity: 1;
}

.certificate-badge {
    background: rgba(255, 255, 255, 0.2);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    transform: scale(0);
    transition: transform var(--transition-normal);
}

.certificate-card:hover .certificate-badge {
    transform: scale(1);
}

.certificate-info {
    padding: var(--spacing-lg);
}

.certificate-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.certificate-description {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.certificate-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.certificate-type,
.certificate-level {
    background: var(--color-accent-alpha);
    color: var(--color-accent);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.certificate-level {
    background: var(--color-primary-alpha);
    color: var(--color-primary);
}

/* Certificates Stats */
.certificates-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    background: var(--color-surface);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ============================================
   11. Media Queries
============================================ */
/* Large Screens (Desktops) */
@media (min-width: 1200px) {
    :root {
        --base-font-size: 18px;
    }
}

/* Medium Screens (Tablets) */
@media (max-width: 992px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-title .name {
        font-size: 3rem;
    }

    .hero-title .profession {
        font-size: 1.5rem;
    }

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

    .about-image {
        max-width: 400px;
        margin: 0 auto var(--spacing-lg);
    }

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

    .timeline::after {
        left: 40px;
    }

    .timeline-marker {
        left: 40px;
    }

    .timeline-content {
        width: calc(100% - 80px);
        float: right;
    }

    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        left: 80px;
        right: auto;
    }
}

/* Small Screens (Mobile) */
@media (max-width: 768px) {
    :root {
        --base-font-size: 14px;
        --spacing-xl: 2rem;
        --spacing-xxl: 3rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

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

    .hero-title .profession {
        font-size: 1.2rem;
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .hero-cta .btn {
        width: 100%;
    }

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

    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .certificates-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-md);
    }

    .certificate-card {
        margin: 0 auto;
        max-width: 350px;
    }

    .certificate-image {
        height: 180px;
    }

    .certificates-stats {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .footer-nav ul {
        flex-direction: column;
        align-items: center;
    }
}

/* Extra Small Screens */
@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-md) 0;
    }

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

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

    .category-tabs {
        flex-direction: column;
        align-items: center;
    }

    .category-tab {
        margin-bottom: var(--spacing-xs);
    }

    .certificates-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .certificate-card {
        max-width: 100%;
    }

    .certificate-image {
        height: 160px;
    }

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

    .stat-number {
        font-size: 2rem;
    }

    .stat-label {
        font-size: 0.875rem;
    }

    /* Mobile navigation improvements */
    .nav-items.glass {
        -webkit-backdrop-filter: blur(20px);
        backdrop-filter: blur(20px);
        background: rgba(0, 0, 0, 0.9);
    }

    /* Touch-friendly hover effects */
    .certificate-card:active {
        transform: translateY(-5px) scale(1.01);
    }

    .skill-card:active {
        transform: translateY(-3px);
    }

    /* Reduce animations on mobile for performance */
    .hover-tilt:hover {
        transform: none;
    }

    .hover-tilt:active {
        transform: scale(0.98);
    }
}