:root {
    --primary-color: #0a2b42;
    --secondary-color: #f4f7f9;
    --accent-color: #007bff;
    --text-color: #333;
    --heading-color: #1d3557;
    --card-bg: #ffffff;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    --transition-speed: 0.3s;
    --error-color: #d93025;
}

/* Basic Reset & Typography */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.7;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    color: var(--heading-color);
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 10px auto 0;
    border-radius: 2px;
}

section {
    padding: 80px 0;
}

main {
    padding-top: 70px; /* Header height */
}

/* Header & Navigation */
header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: background-color var(--transition-speed);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
}

nav a {
    padding: 10px 15px;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    transition: color var(--transition-speed);
}

nav a:hover {
    color: var(--accent-color);
}

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

.hamburger-menu span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px 0;
    transition: all var(--transition-speed) ease-in-out;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(10, 43, 66, 0.7), rgba(10, 43, 66, 0.7)), url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?q=80&w=2070&auto=format&fit=crop') center/cover no-repeat;
    color: white;
    padding: 120px 0;
    text-align: center;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 20px;
    min-height: 50px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}

/* About Section */
.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-image {
    flex: 0 0 250px;
    height: 250px;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.about-text {
    flex: 1;
}
.about-text p {
    margin-bottom: 1rem;
}

/* Skills & Services Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.skill-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.skill-card h3 {
    margin-bottom: 15px;
}

/* Experience Section */
.experience {
    background-color: #e9eff3;
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.experience-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.experience-card h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.company {
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 15px;
    font-style: italic;
}

.experience-card ul {
    padding-left: 20px;
}

.experience-card li {
    margin-bottom: 8px;
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.achievement-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.achievement-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.achievement-card ul {
    padding-left: 20px;
}

.achievement-card li {
    margin-bottom: 8px;
}

/* Portfolio Section */
#portfolio {
    background-color: #e9eff3;
}
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}
.portfolio-card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}
.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
}
.portfolio-card:active {
    transform: translateY(-2px); /* Subtle press effect on touch */
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.12);
}
.portfolio-card-content {
    padding: 25px;
    flex-grow: 1;
}
.portfolio-card h4 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}
.tech-stack {
    font-style: italic;
    color: #555;
    margin-bottom: 15px;
    font-size: 0.9rem;
}
.portfolio-card-footer {
    padding: 20px 25px;
    background-color: #f8f9fa;
    border-top: 1px solid #e9ecef;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: auto; /* Pushes footer to the bottom */
}
.portfolio-card-footer a {
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 5px;
    font-weight: 500;
    transition: all var(--transition-speed);
    text-align: center;
    flex-grow: 1;
}
.btn-live {
    background-color: var(--accent-color);
    color: white;
}
.btn-live:hover {
    background-color: #0056b3;
}
.btn-github {
    background-color: #333;
    color: white;
}
.btn-github:hover {
    background-color: #555;
}

/* Documents Section */
.documents {
    background-color: var(--card-bg);
}
.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.document-card {
    background: var(--secondary-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    text-align: center;
}
.document-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}
.document-card h3 {
    margin-bottom: 15px;
}
.document-card p {
    margin-bottom: 20px;
}
.document-links {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}
.document-links a {
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 5px;
    font-weight: 500;
    transition: all var(--transition-speed);
    text-align: center;
    flex-grow: 1;
    max-width: 150px;
}

/* Contact Section */
#contact {
    background-color: var(--secondary-color);
}
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: flex-start;
}
.contact-form-container p,
.contact-info-container p {
    margin-bottom: 1.5rem;
}
.contact-info-container h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.form-group {
    margin-bottom: 1.2rem;
    position: relative;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border-radius: 5px;
    border: 1px solid #ccc;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}
.form-group textarea {
    resize: vertical;
}
.form-group input.invalid,
.form-group textarea.invalid {
    border-color: var(--error-color);
}
.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    min-height: 1rem;
}
.submit-btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}
.submit-btn:hover {
    background-color: #0056b3;
}
#form-status {
    margin-top: 1rem;
    font-weight: 500;
    min-height: 1.5rem;
}
.contact-details p {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
}
.contact-details a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}
.contact-details a:hover {
    text-decoration: underline;
}
.social-media {
    margin-top: 30px;
}
.social-media a {
    margin-right: 20px;
    color: var(--primary-color);
    transition: color var(--transition-speed);
}
.social-media a:hover {
    color: var(--accent-color);
}
.social-media svg {
    width: 30px;
    height: 30px;
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    padding: 30px 0;
}
#datetime {
    margin-top: 10px;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Mobile Responsive Styles */
@media (max-width: 850px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--card-bg);
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }
    nav.active ul {
        display: flex;
    }
    nav li {
        width: 100%;
        text-align: center;
    }
    nav a {
        display: block;
        padding: 15px;
        border-bottom: 1px solid #eee;
    }
    .hamburger-menu {
        display: block;
    }
    .hamburger-menu.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger-menu.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger-menu.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    .about-image {
        margin-bottom: 30px;
    }
    /* Responsive Contact Section */
    .contact-content {
        grid-template-columns: 1fr;
    }
    .contact-info-container {
        margin-top: 40px;
        text-align: center;
    }
    .social-media a {
        margin: 0 15px;
    }
    .documents-grid {
        grid-template-columns: 1fr;
    }
    .document-links {
        flex-direction: column;
        align-items: center;
    }
    .document-links a {
        max-width: 100%;
    }
    .experience-grid, .achievements-grid {
        grid-template-columns: 1fr;
    }
}