:root {
    /* Stronger Theme - Dark Mode Default */
    --bg-color: #050505;
    --text-color: #ffffff;
    --accent-color: #00f3ff;
    /* Neon Cyan */
    --secondary-color: #bd00ff;
    /* Neon Purple */
    --card-bg: #121212;
    --nav-bg: rgba(5, 5, 5, 0.85);
    --border-color: #333333;

    /* Spacing & Layout */
    --section-padding: 6rem 1.5rem;
    --max-width: 1200px;

    /* Transitions */
    --transition-speed: 0.3s;
}

[data-theme="light"] {
    /* Stronger Light Mode - High Contrast */
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #008cff;
    /* Vivid Blue */
    --secondary-color: #d500f9;
    /* Vivid Purple */
    --card-bg: #f5f5f5;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --border-color: #e0e0e0;
}

/* Global Styles & Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 50% 50%, rgba(0, 243, 255, 0.05) 0%, transparent 50%),
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 100% 100%, 50px 50px, 50px 50px;
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

/* Typography */
h1,
h2,
h3 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -1px;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.5px;
}

h3 {
    font-size: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 2px rgba(0, 243, 255, 0.5));
}

/* Layout Utilities */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: var(--section-padding);
}

.bg-alt {
    background-color: var(--nav-bg);
    /* Slightly different shade */
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), transparent);
    border-radius: 2px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

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

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

.nav-links a {
    font-weight: 500;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s;
}

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

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background 0.3s;
}

#theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Theme Icons Logic */
[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: block;
}


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

.hero-content {
    z-index: 2;
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #94a3b8;
    /* Slate-400 equivalent */
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
    color: #000;
    /* Better contrast on neon */
    font-weight: 700;
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.4);
    border: none;
}

.btn-primary:hover {
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.6);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent-color);
    color: var(--text-color);
    margin-left: 1rem;
}

.btn-outline:hover {
    background: rgba(56, 189, 248, 0.1);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Canvas Background */
#particle-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.scroll-down {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translate(-50%, 0);
    }

    40% {
        transform: translate(-50%, -10px);
    }

    60% {
        transform: translate(-50%, -5px);
    }
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

/* About Image Styling */
.about-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}
.about-text {

    font-size:18px;
}
.img-frame {
    width: 300px;
    height: 300px;
    border-radius: 20px;
    /* Modern squircle or rounded rect */
    overflow: hidden;
    position: relative;
    z-index: 2;
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    transform: rotate(-3deg);
    transition: transform 0.3s ease;
}

.img-frame:hover {
    transform: rotate(0deg) scale(1.02);
}

.img-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Neon Glow Effect behind image */
.img-glow {
    position: absolute;
    width: 310px;
    height: 310px;
    background: linear-gradient(45deg, var(--accent-color), var(--secondary-color));
    border-radius: 20px;
    z-index: 1;
    filter: blur(20px);
    opacity: 0.6;
    animation: pulseGlow 4s infinite alternate;
    transform: rotate(-3deg);
}

@keyframes pulseGlow {
    0% {
        opacity: 0.4;
        filter: blur(20px);
    }

    100% {
        opacity: 0.8;
        filter: blur(30px);
    }
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    z-index: 1;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0, 243, 255, 0) 0%, rgba(0, 243, 255, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: var(--accent-color);
    box-shadow: 0 20px 40px -15px rgba(0, 243, 255, 0.3);
}

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

.project-image img {
    width: 100%;
    height: 220px; /* ارتفاع متناسق مع الـ card */
    object-fit: cover; /* يحافظ على تناسق الصورة */
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    border-radius: 10px 10px 0 0; /* لنعومة حواف الكارد */
}

.project-card:hover img {
    transform: scale(1.15) rotate(1deg); /* نفس تأثير placeholder السابق */
}

.project-image {
    height: 220px;
    overflow: hidden;
    position: relative;
}

.project-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to top, var(--card-bg), transparent);
    opacity: 1;
}

.img-placeholder {
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.project-card:hover .img-placeholder {
    transform: scale(1.15) rotate(1deg);
}

.project-content {
    padding: 1.5rem;
    transform: translateY(0);
    transition: transform 0.4s ease;
}

.project-card:hover .project-content {
    transform: translateY(-5px);
}

.project-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    transition: color 0.3s;
}

.project-card:hover h3 {
    color: var(--accent-color);
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
}

.project-content p {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 1rem;
}

.tech-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tech-tags span {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.btn-view {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 100%;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-view:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Contact Section */
.contact-wrapper {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    position: relative;
    margin-bottom: 2rem;
}

.form-input {
    width: 100%;
    padding: 1rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-color);
    outline: none;
    transition: border-color 0.3s;
}

.form-input:focus {
    border-color: var(--accent-color);
}

.form-label {
    position: absolute;
    left: 1rem;
    top: 1rem;
    color: #94a3b8;
    pointer-events: none;
    transition: 0.3s ease all;
    background-color: var(--bg-color);
    padding: 0 0.25rem;
}

/* Floating Label Logic */
.form-input:focus~.form-label,
.form-input:not(:placeholder-shown)~.form-label {
    top: -0.5rem;
    font-size: 0.8rem;
    color: var(--accent-color);
}

/* Footer */
footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-color);
    font-weight: 500;
}

.social-links a:hover {
    color: var(--accent-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity 0.3s;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.modal-content {
    background-color: var(--card-bg);
    margin: auto;
    padding: 2rem;
    border-radius: 1rem;
    width: 90%;
    max-width: 600px;
    position: relative;
    border: 1px solid var(--border-color);
    transform: scale(0.8);
    transition: transform 0.3s;
}

.modal.show .modal-content {
    transform: scale(1);
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: var(--text-color);
}

.close-modal:hover {
    color: var(--accent-color);
}

/* Improved Anim Utilities */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.fade-in-delay {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards 0.3s;
}

.fade-in-delay-2 {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards 0.6s;
}

/* Stagger for projects */
.projects-grid .project-card {
    opacity: 1;
    /* Handled by scroll observer usually, but for now specific staggered entrance */
    animation: fadeInUp 0.6s ease-out forwards;
}

/* We can use :nth-child to stagger them if they are static, or just stick to observer */
.projects-grid .project-card:nth-child(1) {
    animation-delay: 0.1s;
}

.projects-grid .project-card:nth-child(2) {
    animation-delay: 0.3s;
}

.projects-grid .project-card:nth-child(3) {
    animation-delay: 0.5s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Smooth Navigation highlight */
.nav-links a::after {
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
    box-shadow: 0 0 10px var(--accent-color);
    transition: width 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Filter Bar */
.filter-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-label {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.filter-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: #94a3b8;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    border-color: var(--accent-color);
    color: var(--text-color);
    background: rgba(0, 243, 255, 0.05);
}

.filter-btn.active {
    background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
    color: #000;
    border-color: transparent;
    font-weight: 600;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.3);
}

/* Hide filtered projects */
.project-card.hidden {
    display: none;
    /* Optional: for animation, we might need a more complex setup, 
       but display:none works best for layout reflow of the grid */
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
        /* Mobile menu logic to be implemented or simplified */
    }

    .nav-container .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--nav-bg);
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .menu-toggle {
        display: block;
    }

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