/* ==========================================================================
   AHMED DEFALLA PORTFOLIO - DESIGN SYSTEM & STYLING
   ========================================================================== */

/* --- CSS VARIABLES & TOKENS --- */
:root {
    /* Fonts */
    --font-primary: 'Poppins', sans-serif;
    
    /* Brand Colors */
    --color-primary: #3da882;       /* Accent Teal Green */
    --color-primary-hover: #2d8c6b; /* Accent Hover Teal */
    --color-primary-light: rgba(61, 168, 130, 0.1);
    
    /* Neutral Light Theme */
    --color-bg-light: #f4f7f6;      /* Off-white page background */
    --color-bg-white: #ffffff;      /* Card/Navbar white */
    --color-text-dark: #1f302b;     /* Slate dark text */
    --color-text-muted: #5e6d69;    /* Secondary muted text */
    
    /* Neutral Dark Theme (for Skills & Portfolio Sections) */
    --color-bg-dark: #112d27;       /* Dark teal section background */
    --color-bg-dark-card: #091f1b;  /* Skill card dark green-black */
    --color-text-light: #ffffff;
    --color-text-light-muted: #a4b3b0;
    
    /* Alert/Status Colors */
    --color-error: #e74c3c;
    --color-success: #2ecc71;
    
    /* Borders & Shadows */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
    --shadow-teal: 0 10px 20px rgba(61, 168, 130, 0.2);
    
    /* Transition Speed */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-slow: 0.5s ease;
}

/* --- RESET & GENERAL --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-light);
    color: var(--color-text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

section {
    padding: 100px 0;
}

/* --- BUTTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    border-radius: 50px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

.btn-about {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    box-shadow: var(--shadow-teal);
}

.btn-about:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(61, 168, 130, 0.3);
}

.btn-about:active {
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 14px;
    transition: var(--transition-fast);
}

.btn-about:hover .btn-icon {
    transform: translateY(3px);
}

/* --- HEADER & NAVBAR --- */
.header {
    position: sticky;
    top: 0;
    width: 100%;
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-dark);
    letter-spacing: -0.5px;
}

.nav-menu ul {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-muted);
    position: relative;
    padding: 8px 0;
}

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

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

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

.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* Hamburger Menu Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1100;
}

.hamburger {
    display: block;
    position: relative;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-dark);
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-dark);
    transition: var(--transition-fast);
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    bottom: -6px;
}

/* Hamburger Active Animation */
.nav-toggle.open .hamburger {
    background-color: transparent;
}

.nav-toggle.open .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.nav-toggle.open .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* --- SECTION GENERAL HEADINGS --- */
.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    padding-bottom: 16px;
    color: var(--color-text-dark);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

/* --- HOME SECTION --- */
.home-section {
    background-color: var(--color-bg-light);
    padding: 80px 0 120px 0;
    display: flex;
    align-items: center;
    min-height: calc(100vh - 80px);
}

.home-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
    gap: 60px;
}

.home-content {
    animation: fadeInUp 0.8s ease;
}

.home-greeting {
    font-size: 20px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.home-name {
    font-size: 56px;
    font-weight: 700;
    color: var(--color-text-dark);
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -1.5px;
}

.home-title {
    font-size: 24px;
    color: var(--color-text-muted);
    font-weight: 400;
    margin-bottom: 36px;
}

.social-links {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-bg-white);
    color: var(--color-text-muted);
    border: 1px solid rgba(0,0,0,0.08);
    font-size: 16px;
    box-shadow: var(--shadow-sm);
}

.social-links a:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    transform: translateY(-5px);
    box-shadow: var(--shadow-teal);
    border-color: var(--color-primary);
}

/* Home Section Image Wrapper */
.home-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 1s ease 0.2s both;
}

.avatar-backdrop {
    position: absolute;
    width: 340px;
    height: 340px;
    background: linear-gradient(135deg, var(--color-primary), #52c79c);
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    animation: blobMorph 10s linear infinite alternate;
    z-index: 1;
    filter: blur(10px);
    opacity: 0.6;
    transition: var(--transition-normal);
}

.avatar-container {
    position: relative;
    width: 320px;
    height: 320px;
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    overflow: hidden;
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-lg);
    border: 6px solid var(--color-bg-white);
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: blobMorph 10s linear infinite alternate;
    animation-delay: -2s; /* Out of phase with backdrop for liquid offset effect */
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transition: transform var(--transition-normal);
}

/* Interactive Hover Effects for Avatar Group */
.home-image-wrapper:hover .avatar-container {
    transform: scale(1.03);
    border-color: var(--color-primary);
}

.home-image-wrapper:hover .avatar-backdrop {
    transform: scale(1.08);
    opacity: 0.82;
    filter: blur(14px);
}

.home-image-wrapper:hover .avatar-img {
    transform: scale(1.06);
}

.avatar-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-text-muted);
}

.avatar-placeholder i {
    font-size: 64px;
    color: var(--color-primary-light);
}

.avatar-placeholder span {
    font-size: 14px;
    font-weight: 500;
}

/* --- ABOUT SECTION --- */
.about-section {
    background-color: var(--color-bg-white);
    padding-bottom: 0; /* Let the dark skills section follow directly */
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    margin-bottom: 80px;
}

.about-text h3 {
    font-size: 28px;
    margin-bottom: 24px;
    font-weight: 600;
}

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

.about-text p {
    font-size: 16px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    text-align: justify;
}

.about-details {
    background-color: var(--color-bg-light);
    padding: 32px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 20px;
}

.detail-row {
    display: flex;
    border-bottom: 1px dashed rgba(0,0,0,0.08);
    padding-bottom: 12px;
}

.detail-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.detail-label {
    width: 100px;
    font-weight: 600;
    color: var(--color-text-dark);
}

.detail-value {
    color: var(--color-text-muted);
}

/* --- SKILLS & ABILITIES CONTAINER --- */
.skills-wrapper {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: 80px 0;
}

.skills-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.skill-card {
    background-color: var(--color-bg-dark-card);
    border-radius: var(--border-radius-md);
    padding: 32px 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.03);
}

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

.skill-icon {
    font-size: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 70px;
    height: 70px;
}

.skill-name {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-light);
}

/* Skill Icon Colors */
.html-icon { color: #e34f26; }
.css-icon { color: #1572b6; }
.js-icon { color: #f7df1e; }
.python-icon { color: #3776ab; }
.github-icon { color: #ffffff; }
.wordpress-icon { color: #21759b; }

/* Custom Text Logos for C, C++ */
.c-icon, .cpp-icon {
    background-color: rgba(255,255,255,0.05);
    border-radius: 50%;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 24px;
    border: 2px solid var(--color-primary);
}

/* --- SERVICES SECTION --- */
.services-section {
    background-color: var(--color-bg-light);
}

.services-section .section-title {
    margin-bottom: 60px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    background-color: var(--color-bg-white);
    border-radius: var(--border-radius-md);
    padding: 40px 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    border: 1px solid rgba(0,0,0,0.03);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.service-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px auto;
    font-size: 24px;
}

/* Services Accent Colors */
.web-dev-service {
    background-color: rgba(61, 168, 130, 0.1);
    color: var(--color-primary);
}
.responsive-service {
    background-color: rgba(230, 126, 34, 0.1);
    color: #e67e22;
}
.creative-service {
    background-color: rgba(155, 89, 182, 0.1);
    color: #9b59b6;
}
.ideas-service {
    background-color: rgba(241, 196, 15, 0.1);
    color: #f1c40f;
}
.retouch-service {
    background-color: rgba(52, 152, 219, 0.1);
    color: #3498db;
}
.support-service {
    background-color: rgba(231, 76, 60, 0.1);
    color: #e74c3c;
}

.service-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-dark);
}

.service-description {
    font-size: 14px;
    color: var(--color-text-muted);
}

/* --- PORTFOLIO SECTION --- */
.portfolio-section {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
}

.portfolio-section .section-title {
    color: var(--color-text-light);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.portfolio-card {
    background-color: var(--color-bg-white);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.portfolio-image-container {
    position: relative;
    width: 100%;
    height: 200px;
    background-color: #e0e0e0;
}

.browser-header {
    height: 28px;
    background-color: #eef2f1;
    display: flex;
    align-items: center;
    gap: 6px;
    padding-left: 14px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.browser-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.dot-red { background-color: #fc5c57; }
.dot-yellow { background-color: #fdbc40; }
.dot-green { background-color: #34c749; }

.portfolio-img {
    width: 100%;
    height: calc(100% - 28px);
    object-fit: cover;
    object-position: center top;
    transition: var(--transition-normal);
}

.portfolio-card:hover .portfolio-img {
    transform: scale(1.06);
}

.portfolio-info {
    padding: 24px;
    color: var(--color-text-dark);
}

.portfolio-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.portfolio-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.portfolio-link::after {
    content: ' →';
    transition: var(--transition-fast);
}

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

.portfolio-link:hover::after {
    transform: translateX(4px);
}

/* --- CONTACT SECTION --- */
.contact-section {
    background-color: var(--color-bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 60px;
    margin-top: 40px;
}

.contact-info h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
}

.contact-info p {
    color: var(--color-text-muted);
    margin-bottom: 32px;
}

.contact-details-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.contact-text span {
    display: block;
    font-size: 12px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.contact-text a, .contact-text p {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-dark);
}

.contact-text a:hover {
    color: var(--color-primary);
}

/* Form Styles */
.contact-form {
    background-color: var(--color-bg-light);
    padding: 40px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text-dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(0,0,0,0.1);
    background-color: var(--color-bg-white);
    font-family: var(--font-primary);
    font-size: 14px;
    color: var(--color-text-dark);
    outline: none;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(61, 168, 130, 0.15);
}

.btn-submit {
    width: 100%;
    background-color: var(--color-primary);
    color: var(--color-text-light);
    justify-content: center;
    box-shadow: var(--shadow-teal);
}

.btn-submit:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
}

.btn-submit:hover .btn-icon {
    transform: translate(3px, -3px);
}

/* --- FOOTER --- */
.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light-muted);
    padding: 40px 0;
    border-top: 1px solid rgba(255,255,255,0.05);
}

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

.copyright {
    font-size: 14px;
}

.footer-socials {
    display: flex;
    gap: 16px;
}

.footer-socials a {
    color: var(--color-text-light-muted);
    font-size: 16px;
    transition: var(--transition-fast);
}

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

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes blobMorph {
    0% {
        border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    }
    34% {
        border-radius: 70% 30% 50% 50% / 30% 60% 40% 70%;
    }
    67% {
        border-radius: 50% 60% 30% 70% / 60% 30% 70% 40%;
    }
    100% {
        border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    }
}

/* --- RESPONSIVENESS & MEDIA QUERIES --- */
@media (max-width: 1024px) {
    .home-container {
        gap: 40px;
    }
    
    .home-name {
        font-size: 46px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    section {
        padding: 70px 0;
    }
    
    .navbar-container {
        position: relative;
    }
    
    /* Mobile Navigation */
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: absolute;
        top: 80px;
        left: -24px;
        width: calc(100% + 48px);
        background-color: var(--color-bg-white);
        box-shadow: 0 10px 15px rgba(0,0,0,0.05);
        padding: 24px;
        border-top: 1px solid rgba(0,0,0,0.05);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: var(--transition-normal);
        z-index: 999;
    }
    
    .nav-menu.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-menu ul {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    /* Columns Collapses */
    .home-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 50px;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .home-image-wrapper {
        order: -1; /* Place image on top on mobile */
    }
    
    .avatar-container {
        width: 280px;
        height: 280px;
    }
    
    .avatar-backdrop {
        width: 300px;
        height: 300px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-text p {
        text-align: left;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .home-name {
        font-size: 36px;
    }
    
    .home-title {
        font-size: 18px;
    }
    
    .avatar-container {
        width: 240px;
        height: 240px;
    }
    
    .avatar-backdrop {
        width: 260px;
        height: 260px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 24px;
    }
}