/* =================================================================
   DESIGN SYSTEM & THEME
   ================================================================= */
:root {
    /* Color Palette */
    --color-background: #0a0a0a;
    --color-surface: #1a1a1a;
    --color-primary: #00aaff;
    --color-secondary: #e040fb;
    --color-text: #e0e0e0;
    --color-text-muted: #a0a0a0;
    --color-border: rgba(255, 255, 255, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(45deg, var(--color-primary), var(--color-secondary));
    --gradient-glow: radial-gradient(circle, rgba(0, 170, 255, 0.2) 0%, rgba(0, 170, 255, 0) 70%);

    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-monospace: 'Roboto Mono', monospace;
    --fs-base: 16px;
    --fs-sm: 0.875rem;
    --fs-md: 1rem;
    --fs-lg: 1.25rem;
    --fs-xl: 1.5rem;
    --fs-xxl: 2.5rem;
    --fs-display: 4rem;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 4rem;

    /* Effects */
    --shadow-sm: 0 4px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px var(--color-primary), 0 0 30px var(--color-primary);
    --border-radius: 8px;
    --transition-fast: all 0.2s ease-in-out;
    --transition-slow: all 0.4s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--fs-base);
}

body {
    background-color: var(--color-background);
    color: var(--color-text);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: #fff;
}

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

a:hover {
    color: var(--color-secondary);
}

img {
    max-width: 100%;
    display: block;
}

/* =================================================================
   NAVIGATION BAR
   ================================================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--space-sm) 0;
    z-index: 1000;
    background-color: transparent;
    transition: background-color 0.3s, backdrop-filter 0.3s;
}

.navbar.scrolled {
    background-color: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.navbar-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: var(--fs-lg);
    font-weight: 700;
    color: #fff;
}

.nav-menu {
    display: flex;
    gap: var(--space-md);
}

.nav-menu a {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-fast);
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: #fff;
    margin: 5px 0;
    transition: var(--transition-slow);
}

/* =================================================================
   HERO SECTION
   ================================================================= */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-content {
    z-index: 1;
    animation: fadeIn 1s ease-in-out;
}

.hero-name {
    font-size: var(--fs-display);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-sm);
}

.hero-tagline {
    font-size: var(--fs-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    min-height: 1.6em; /* Prevent layout shift */
}

.hero-tagline .typing-text::after {
    content: '|';
    animation: blink 0.7s infinite;
}

/* =================================================================
   BUTTONS
   ================================================================= */
.btn {
    padding: 0.8em 1.5em;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition-fast);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
}

.btn-primary:hover {
    color: #fff;
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px);
}

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: #fff;
}

/* =================================================================
   GENERAL CONTENT SECTIONS
   ================================================================= */
.content-section {
    padding: var(--space-xl) 0;
    width: 90%;
    max-width: 1000px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s, transform 0.6s;
}

.content-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-size: var(--fs-xxl);
    text-align: center;
    margin-bottom: var(--space-lg);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
}

/* =================================================================
   ABOUT / TIMELINE SECTION
   ================================================================= */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 3px;
    background: var(--color-border);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1.5px;
}

.timeline-item {
    padding: var(--space-sm) var(--space-lg);
    position: relative;
    width: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    padding-right: calc(var(--space-lg) + 25px);
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
    padding-left: calc(var(--space-lg) + 25px);
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--color-background);
    border: 3px solid var(--color-primary);
    top: 50%;
    transform: translateY(-50%);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item:nth-child(even)::after {
    left: -10px;
}

.timeline-content {
    padding: var(--space-md);
    background: var(--color-surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.timeline-date {
    font-size: var(--fs-sm);
    color: var(--color-secondary);
    margin-bottom: var(--space-xs);
    font-family: var(--font-monospace);
}

.timeline-title {
    font-size: var(--fs-lg);
    margin-bottom: var(--space-xs);
}

/* =================================================================
   SKILLS SECTION
   ================================================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-md);
}

.skill-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--space-md);
    text-align: center;
    transition: var(--transition-fast);
}

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

.skill-card i {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.skill-card h3 {
    font-size: var(--fs-md);
}

/* =================================================================
   PROJECTS SECTION
   ================================================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition-slow);
    position: relative;
}

.project-card:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

.project-image {
    height: 200px;
    background-size: cover;
    background-position: center;
    filter: grayscale(50%);
    transition: var(--transition-slow);
}

.project-card:hover .project-image {
    filter: grayscale(0%);
}

.project-content {
    padding: var(--space-md);
}

.project-title {
    font-size: var(--fs-lg);
    margin-bottom: var(--space-sm);
}

.project-description {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tech-tag {
    background-color: rgba(0, 170, 255, 0.1);
    color: var(--color-primary);
    padding: 0.3em 0.6em;
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: var(--font-monospace);
}

.project-links a {
    margin-right: var(--space-sm);
}

/* =================================================================
   CONTACT SECTION
   ================================================================= */
.contact-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-form {
    margin-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-family: inherit;
    font-size: var(--fs-md);
}

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

.form-group label {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    color: var(--color-text-muted);
    pointer-events: none;
    transition: var(--transition-fast);
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: -0.75em;
    left: var(--space-sm);
    font-size: var(--fs-sm);
    color: var(--color-primary);
    background-color: var(--color-surface);
    padding: 0 0.3em;
}

.social-links {
    margin-top: var(--space-lg);
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.social-links a {
    font-size: var(--fs-lg);
    color: var(--color-text-muted);
}

.social-links a:hover {
    color: var(--color-primary);
    transform: scale(1.2);
}

/* =================================================================
   FOOTER
   ================================================================= */
.footer {
    text-align: center;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
}

/* =================================================================
   ANIMATIONS & KEYFRAMES
   ================================================================= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* =================================================================
   RESPONSIVE DESIGN
   ================================================================= */
@media (max-width: 768px) {
    :root {
        --fs-display: 3rem;
        --fs-xxl: 2rem;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background-color: rgba(10, 10, 10, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-lg);
        transition: right 0.4s ease-in-out;
    }

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

    .hamburger {
        display: block;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .hamburger.active span:nth-child(2) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .timeline::after {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding-left: calc(20px + var(--space-lg));
        padding-right: 0;
        text-align: left !important;
        left: 0 !important;
    }

    .timeline-item::after {
        left: 10px;
    }
}