/*
    Professional Portfolio Stylesheet (style.css)
    Author: Gemini
*/

/* 1. Global Reset and Base Styles */
:root {
    --primary-color: #0077b6; /* A clean, professional blue */
    --secondary-color: #03045e; /* Darker blue for accents */
    --text-color: #333;
    --light-text-color: #fff;
    --background-color: #f4f7f6;
    --card-bg: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 8px;
    --font-family: 'Inter', sans-serif;
}

/* Load Inter font (using a simple sans-serif fallback for this CSS file) */
body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    scroll-behavior: smooth;
}

h1, h2, h3 {
    margin-top: 0;
    line-height: 1.2;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* 2. Header and Navigation */
header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--secondary-color);
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    font-weight: 500;
    color: var(--text-color);
    padding: 5px 10px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s, color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* 3. Hero Section */
.hero {
    background-color: var(--card-bg);
    padding: 80px 0;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    max-width: 60%;
}

.hero .subtitle {
    color: var(--primary-color);
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 5px;
}

.hero h2 {
    font-size: 2.5em;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.hero .title {
    font-size: 1.5em;
    font-weight: 300;
    color: #555;
    margin-bottom: 20px;
}

.hero .summary-text {
    font-size: 1.1em;
    margin-bottom: 30px;
}

.hero-image-placeholder {
    background-color: var(--background-color);
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 200px;
    height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #999;
    box-shadow: var(--shadow);
}

/* 4. Buttons */
.btn {
    display: inline-block;
    padding: 10px 25px;
    margin-right: 15px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    text-align: center;
}

.primary-btn {
    background-color: var(--primary-color);
    color: var(--light-text-color);
}

.primary-btn:hover {
    background-color: var(--secondary-color);
    box-shadow: 0 6px 15px rgba(0, 119, 182, 0.4);
}

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

.secondary-btn:hover {
    background-color: var(--primary-color);
    color: var(--light-text-color);
}

.contact-links {
    display: flex;
    gap: 15px;
}

/* 5. Section General Styling */
.section {
    padding: 60px 0;
}

.bg-light {
    background-color: var(--background-color);
}

.bg-dark {
    background-color: var(--secondary-color);
}

.section-title {
    text-align: center;
    font-size: 2.5em;
    margin-bottom: 10px;
    color: var(--secondary-color);
    text-transform: uppercase;
}

.section-description {
    text-align: center;
    font-size: 1.1em;
    margin-bottom: 40px;
    color: #777;
}

.white-text {
    color: var(--light-text-color) !important;
}

/* 6. About Section */
.grid-2-cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.about-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.about-card h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--background-color);
    padding-bottom: 10px;
}

.about-card p {
    margin-bottom: 10px;
    font-size: 0.95em;
}

.about-card .quote {
    margin-top: 20px;
    padding-left: 15px;
    border-left: 3px solid var(--primary-color);
    font-style: italic;
    color: #666;
}
.about-card .small-text {
    font-size: 0.85em;
    color: #999;
}

/* 7. Experience Section (Timeline) */
.timeline {
    position: relative;
    padding: 20px 0;
    max-width: 800px;
    margin: 0 auto;
}

/* Vertical line for the timeline */
.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 10px; /* Position on the left for single-column mobile view */
    width: 3px;
    background-color: var(--primary-color);
}

.timeline-item {
    position: relative;
    padding-left: 40px;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    border: 4px solid var(--background-color);
}

.timeline-content {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.timeline-content h3 {
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.timeline-content .date {
    font-style: italic;
    color: var(--primary-color);
    margin-bottom: 15px;
    display: block;
}

.timeline-content ul {
    padding-left: 20px;
    margin: 0;
}
.timeline-content li {
    margin-bottom: 8px;
}

/* 8. Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    text-align: center;
}

.skill-category {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-top: 5px solid var(--primary-color);
}

.skill-category h3 {
    font-size: 1.3em;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.skill-category p {
    font-size: 0.95em;
    line-height: 1.5;
}

.icon-color {
    color: var(--primary-color);
    margin-right: 8px;
}

/* 9. Projects & Certifications Section */
.project-list, .certification-list {
    margin-bottom: 40px;
}

.project-list h3, .certification-list h3 {
    color: var(--secondary-color);
    font-size: 1.5em;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 5px;
    margin-bottom: 20px;
}

.project-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-left: 5px solid var(--primary-color);
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    box-shadow: var(--shadow);
}

.project-card h4 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.project-card p strong {
    font-weight: 600;
}

.certification-list ul {
    list-style-type: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
}

.certification-list li {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow);
    font-weight: 500;
    font-size: 0.95em;
}

/* 10. Contact Section */
.bg-dark .contact-details {
    text-align: center;
    margin-bottom: 30px;
}

.bg-dark .contact-details p {
    font-size: 1.1em;
    margin: 10px 0;
}

.bg-dark .contact-details a {
    color: var(--light-text-color);
    transition: color 0.3s ease;
}

.bg-dark .contact-details a:hover {
    color: var(--primary-color);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--text-color);
    font-size: 1em;
}

.contact-form textarea {
    resize: vertical;
}

.submit-btn {
    align-self: flex-start;
}

/* 11. Footer */
footer {
    background-color: #1a1a1a;
    color: #ccc;
    text-align: center;
    padding: 20px 0;
    font-size: 0.9em;
}

/* 12. Media Queries for Responsiveness */
@media (max-width: 900px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    .hero-content {
        max-width: 100%;
    }
    .hero-image-placeholder {
        margin-top: 30px;
    }
    .timeline::before {
        /* Keep the timeline line on the left for all mobile views */
        left: 10px;
    }
    nav ul {
        /* Stack navigation items vertically in the center */
        flex-direction: column;
        align-items: center;
        margin-top: 10px;
    }
    nav ul li {
        margin: 5px 0;
    }
    header .container {
        flex-direction: column;
    }
}

@media (max-width: 600px) {
    .section {
        padding: 40px 0;
    }
    .section-title {
        font-size: 2em;
    }
    .timeline-item {
        padding-left: 30px;
    }
    .timeline-dot {
        height: 15px;
        width: 15px;
        left: 0;
    }
    .contact-links {
        justify-content: center;
        flex-direction: column;
        gap: 10px;
    }
    .btn {
        margin-right: 0;
        width: 100%;
    }
}