/*
 * Custom styles for Mohamed Izad's portfolio.
 * This stylesheet is inspired by modern personal portfolios with
 * a dark theme and purple accent. It defines a consistent
 * colour palette, responsive layouts and interactive elements
 * such as tabbed content and animated buttons. The design
 * takes cues from the provided reference website while
 * reflecting Mohamed's professional profile.
 */

/* Colour palette */
:root {
    --bg-primary: #0a0a0f;         /* main background */
    --bg-secondary: #14141f;       /* card and secondary backgrounds */
    --text-primary: #e5e5e5;       /* primary text colour */
    --text-muted: #8a8a9c;         /* muted text colour */
    --accent: #8b5cf6;             /* primary accent (purple) */
    --accent-light: #a78bfa;       /* lighter accent for hover */
    --border-colour: #2c2c38;      /* subtle border colour */
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* When the mobile navigation menu is open we disable body scrolling to prevent
   the background from scrolling underneath the overlay. */
body.menu-open {
    overflow: hidden;
}
a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}
a:hover {
    color: var(--accent-light);
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utility classes */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.section {
    padding: 100px 0;
}
.section-heading {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 60px;
    position: relative;
}
.section-heading::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: var(--accent);
    margin-top: 10px;
}

/* Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.95);
    border-bottom: 1px solid var(--border-colour);
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}
.brand {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--accent);
}
.nav-menu {
    list-style: none;
    display: flex;
    gap: 16px;
}
.nav-link {
    display: block;
    padding: 8px 20px;
    border: 1px solid var(--border-colour);
    border-radius: 50px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.3s ease, color 0.3s ease;
}
.nav-link:hover {
    background: var(--accent);
    color: #fff;
}
.nav-link.active {
    background: var(--accent);
    color: #fff;
}

/* Mobile navigation toggle button (hamburger) */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    margin-left: auto;
    /* Ensure the toggle sits above other elements on small screens */
    z-index: 1100;
}
.nav-toggle .hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--accent);
    margin: 5px 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Transform hamburger lines into a cross when menu is open */
.nav-toggle.open .hamburger:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.open .hamburger:nth-child(2) {
    opacity: 0;
}
.nav-toggle.open .hamburger:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 120px;
    background: var(--bg-primary);
}
.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 60px;
}
@media (min-width: 768px) {
    .hero-container {
        flex-direction: row;
        align-items: center;
        gap: 80px;
    }
}
.hero-content {
    flex: 1;
}
.hero-name {
    font-size: 3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
}
@media (min-width: 768px) {
    .hero-name {
        font-size: 4rem;
    }
}
.hero-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent);
    min-height: 40px;
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
}
.hero-title #cursor {
    margin-left: 5px;
    color: var(--accent);
    animation: blink 0.7s infinite;
}
@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}
.hero-description {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-bottom: 30px;
}
.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}
.btn {
    display: inline-block;
    padding: 10px 28px;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    transition: background 0.3s ease, color 0.3s ease, border 0.3s ease;
    border: 2px solid transparent;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover {
    background: var(--accent-light);
}
.btn-secondary {
    background: transparent;
    border-color: var(--accent);
    color: var(--accent);
}
.btn-secondary:hover {
    background: var(--accent);
    color: #fff;
}
.hero-image-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-image {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    object-fit: cover;
    /* Removed the purple border and brightness to blend the hero image with the background. */
    border: none;
    filter: none;
    position: relative;
    z-index: 1;
}
.hero-image-wrapper::before {
    content: '';
    position: absolute;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    /* Use a subtle background glow instead of the purple accent to avoid a colored halo. */
    background: radial-gradient(circle at 30% 30%, var(--bg-secondary) 0%, transparent 60%);
    opacity: 0.3;
    z-index: 0;
}
@media (min-width: 992px) {
    .hero-image {
        width: 360px;
        height: 360px;
    }
    .hero-image-wrapper::before {
        width: 420px;
        height: 420px;
    }
}

/* About Section */
.about-section {
    background: var(--bg-secondary);
}
.about-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
}
@media (min-width: 768px) {
    .about-grid {
        flex-direction: row;
        align-items: flex-start;
    }
}
.about-photo img {
    width: 240px;
    height: 240px;
    object-fit: cover;
    border-radius: 20px;
    /* Soften the portrait border in the About section to blend with the dark theme. */
    border: 3px solid var(--border-colour);
}
.about-content {
    flex: 1;
}
.about-content p {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}
.about-list {
    list-style: none;
    margin-top: 20px;
}
.about-list li {
    margin-bottom: 8px;
    font-size: 0.9rem;
}
.about-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Tabs */
.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.tab-button {
    padding: 8px 20px;
    border-radius: 50px;
    border: 1px solid var(--border-colour);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease, color 0.3s ease;
}
.tab-button:hover {
    background: var(--accent);
    color: #fff;
}
.tab-button.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.tab {
    display: none;
}
.tab.active {
    display: block;
}

/* Timeline for Experience & Education */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 40px;
}
.timeline-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-colour);
    border-left: 4px solid var(--accent);
    padding: 20px 25px;
    border-radius: 8px;
    position: relative;
}
.timeline-date {
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 8px;
}
.timeline-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}
.timeline-item h4 {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 10px;
}
.timeline-item ul {
    list-style: disc;
    padding-left: 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.timeline-item ul li {
    margin-bottom: 6px;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}
.skill-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-colour);
    border-radius: 8px;
    padding: 25px;
    text-align: center;
    transition: transform 0.3s ease;
}
.skill-card:hover {
    transform: translateY(-5px);
}
.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--accent);
}
.skill-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.skill-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Projects Section */
.projects-section {
    background: var(--bg-secondary);
}
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}
.project-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-colour);
    border-radius: 8px;
    padding: 25px;
    position: relative;
    transition: transform 0.3s ease;
}
.project-card:hover {
    transform: translateY(-5px);
}
.project-tag {
    position: absolute;
    top: -14px;
    left: 20px;
    background: var(--accent);
    color: #fff;
    font-size: 0.7rem;
    letter-spacing: 0.5px;
    padding: 4px 12px;
    border-radius: 12px;
    text-transform: uppercase;
}
.project-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}
.project-date {
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 10px;
}
.project-description {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Awards Section */
.awards-section {
    background: var(--bg-primary);
}
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}
.award-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-colour);
    border-radius: 8px;
    padding: 25px;
    transition: transform 0.3s ease;
}
.award-card:hover {
    transform: translateY(-5px);
}
.award-date {
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 8px;
}
.award-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}
.award-body {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Contact Section */
.contact-section {
    background: var(--bg-secondary);
}
.contact-intro {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px auto;
    text-align: center;
}
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}
.contact-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-colour);
    border-radius: 8px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: transform 0.3s ease;
}
.contact-card:hover {
    transform: translateY(-5px);
}
.contact-icon {
    font-size: 2rem;
    color: var(--accent);
}
.contact-info h3 {
    font-size: 1rem;
    margin-bottom: 4px;
    color: var(--text-primary);
}
.contact-info p a {
    color: var(--accent);
    font-weight: 500;
}
.contact-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Social media links in the Contact section
   Centre the icons horizontally and reduce their size so they don't
   dominate the layout. Each icon is wrapped in a circular button
   with subtle hover interactions. */
.social-links {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}
.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 1px solid var(--border-colour);
    color: var(--accent);
    transition: background 0.3s ease, color 0.3s ease;
}
.social-link:hover {
    background: var(--accent);
    color: #fff;
}
.social-link svg {
    width: 20px;
    height: 20px;
}

/* -------------------------------------------------------------------- */
/* Responsive layout adjustments
   These media queries ensure the portfolio looks good on tablets and
   smartphones by adjusting font sizes, grid layouts and element
   dimensions when the viewport width decreases. */

@media (max-width: 768px) {
    /* Show mobile nav toggle */
    .nav-toggle {
        display: block;
    }

    /* Convert the nav menu into a slide‑in panel.  We position it off‑screen and
       use a transform to bring it into view when the menu is opened.  This
       approach provides smoother animations and avoids the jerky layout
       shift that occurs when adjusting the `right` property. */
    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: 80%;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        align-items: center;
        gap: 24px;
        padding-top: 100px;
        padding-bottom: 40px;
        /* Hide the menu off screen initially */
        transform: translateX(100%);
        transition: transform 0.35s ease;
        z-index: 1050;
    }
    /* When the menu is open, bring it fully into view */
    .nav-menu.open {
        transform: translateX(0);
    }
    /* Each nav item spans full width for easier tapping */
    .nav-menu li {
        width: 100%;
        text-align: center;
    }
    .nav-menu .nav-link {
        display: block;
        padding: 12px 0;
        width: 100%;
    }
    /* Hero section: reduce font sizes and image dimensions */
    .hero-name {
        font-size: 2.5rem;
    }
    .hero-title {
        font-size: 1.2rem;
    }
    .hero-image {
        width: 220px;
        height: 220px;
    }
    /* About section: smaller portrait */
    .about-photo img {
        width: 200px;
        height: 200px;
    }
    /* Skills and awards grids: allow more items per row */
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 20px;
    }
    .cards-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    .project-card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    /* Navigation: stack items vertically; keep slide‑in behaviour */
    .nav-menu {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
    .nav-link {
        width: 100%;
        text-align: center;
    }
    /* Further reduce hero section sizes */
    .hero-name {
        font-size: 2rem;
    }
    .hero-title {
        font-size: 1rem;
    }
    .hero-description {
        font-size: 0.9rem;
    }
    .hero-image {
        width: 180px;
        height: 180px;
    }
    .about-photo img {
        width: 180px;
        height: 180px;
    }
    /* Contact section: stack icon above text */
    .contact-card {
        flex-direction: column;
        align-items: flex-start;
    }
    .contact-icon {
        font-size: 1.5rem;
        margin-bottom: 10px;
    }
}

/* Footer */
.footer {
    background: var(--bg-primary);
    padding: 30px 0;
    border-top: 1px solid var(--border-colour);
    text-align: center;
}
.footer-container {
    color: var(--text-muted);
    font-size: 0.8rem;
}