/* 
   Portfolio Website Styles
   Author: Sivaramakrishnan Kasiviswanathan
   Description: Styles for personal portfolio website
*/

/* ===== VARIABLES ===== */
:root {
    /* Color Palette - Modern Pastel */
    --primary-color: #68B0AB;  /* Soft teal/blue-green */
    --secondary-color: #F87575; /* Muted coral/salmon */
    --accent-color: #8C9EFF;   /* Soft periwinkle blue */
    --light-color: #FAF9F8;    /* Very light cream/beige */
    --dark-color: #345B63;     /* Deep gray-blue */
    --gray-color: #B0B8B9;     /* Soft gray */
    --success-color: #A8E6CF;  /* Mint green */
    
    /* Typography - Modern */
    --heading-font: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --body-font: 'Roboto', 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-medium: 0.5s ease;
    --transition-slow: 0.8s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--body-font);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    font-weight: 700;
    line-height: 1.3;
}

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

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

ul {
    list-style: none;
}

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

section {
    padding: var(--spacing-xl) 0;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    font-size: 2.5rem;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background-color: var(--secondary-color);
    margin: var(--spacing-sm) auto;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background-color: #7A8BFF; /* Darker version of accent color */
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #E56565; /* Darker version of secondary color */
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

.btn-outline:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== NAVIGATION ===== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-fast);
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: 1.8rem;
    margin-bottom: 0;
    color: var(--primary-color);
}

.logo span {
    font-weight: 400;
    color: var(--secondary-color);
}

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

.nav-links li {
    margin-left: var(--spacing-md);
}

.nav-links a {
    color: var(--dark-color);
    font-weight: 600;
    position: relative;
    padding: 0.5rem 0;
}

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

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

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all var(--transition-fast);
    background-color: var(--dark-color);
}

/* ===== HERO SECTION ===== */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, rgba(104, 176, 171, 0.9) 0%, rgba(52, 91, 99, 0.8) 100%);
    color: white;
    display: flex;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    background-image: url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><polygon fill="rgba(255,255,255,0.05)" points="0,100 100,0 100,100"/></svg>');
    background-size: cover;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--secondary-color);
    font-weight: 300;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* ===== ABOUT SECTION ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-image {
    text-align: center;
}

.image-placeholder {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background-color: #f1f1f1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    border: 5px solid var(--accent-color);
}

.image-placeholder i {
    font-size: 5rem;
    color: var(--gray-color);
    margin-bottom: var(--spacing-xs);
}

.image-placeholder p {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.about-text p {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.detail {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.detail i {
    color: var(--accent-color);
    margin-right: var(--spacing-xs);
    font-size: 1.2rem;
}

/* ===== EXPERIENCE SECTION ===== */
.timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 6px;
    background-color: var(--gray-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
    border-radius: 5px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    left: 0;
    margin-bottom: var(--spacing-lg);
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--accent-color);
    border-radius: 50%;
    z-index: 1;
    top: 15px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

.timeline-content {
    padding: var(--spacing-md);
    background-color: white;
    position: relative;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.timeline-location {
    color: var(--gray-color);
    font-style: italic;
    margin-bottom: var(--spacing-xs);
}

.timeline-duration {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.experience-subsection {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid #eee;
}

.experience-subsection h4 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-xs);
}

.experience-subsection ul {
    padding-left: var(--spacing-md);
    list-style-type: disc;
}

.experience-subsection li {
    margin-bottom: var(--spacing-xs);
}

/* ===== CONSULTING SECTION ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 70px;
    height: 70px;
    background-color: rgba(140, 158, 255, 0.1); /* Using accent-color with opacity */
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.service-icon i {
    font-size: 2rem;
    color: var(--accent-color);
}

.service-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.service-card p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-color);
}

.service-card ul {
    padding-left: var(--spacing-md);
    list-style-type: disc;
}

.service-card li {
    margin-bottom: var(--spacing-xs);
    color: var(--dark-color);
}

/* ===== MENTORSHIP SECTION ===== */
.mentorship-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.mentorship-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.mentorship-text p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.mentorship-offerings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.mentorship-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-fast);
}

.mentorship-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.mentorship-icon {
    width: 80px;
    height: 80px;
    background-color: rgba(248, 117, 117, 0.1); /* Using secondary-color with opacity */
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto var(--spacing-sm);
}

.mentorship-icon i {
    font-size: 2.5rem;
    color: var(--secondary-color);
}

.mentorship-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.mentorship-card p {
    color: var(--gray-color);
}

/* ===== PROJECTS SECTION ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    height: 200px;
    background-color: var(--primary-color);
    position: relative;
}

.project-image .image-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 0;
    border: none;
    background-color: rgba(104, 176, 171, 0.8); /* Using primary-color with opacity */
}

.project-image .image-placeholder i {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.7);
}

.project-content {
    padding: var(--spacing-md);
}

.project-content h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

.project-content p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-color);
}

.project-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.project-stat {
    color: var(--accent-color);
    font-weight: 600;
}

.project-tech {
    color: var(--gray-color);
    font-size: 0.9rem;
}

/* ===== SKILLS SECTION ===== */
.skills-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.skill-category {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.skill-category h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.skill-category h3 i {
    margin-right: var(--spacing-xs);
    color: var(--accent-color);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    background-color: rgba(140, 158, 255, 0.1); /* Using accent-color with opacity */
    color: var(--accent-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

/* ===== AWARDS SECTION ===== */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.award-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    transition: transform var(--transition-fast);
}

.award-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.award-icon {
    width: 50px;
    height: 50px;
    background-color: rgba(248, 117, 117, 0.1); /* Using secondary-color with opacity */
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.award-icon i {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

.award-content h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
    font-size: 1.1rem;
}

.award-content p {
    color: var(--gray-color);
    font-size: 0.95rem;
}

/* ===== CONTACT SECTION ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact-item i {
    width: 50px;
    height: 50px;
    background-color: rgba(140, 158, 255, 0.1); /* Using accent-color with opacity */
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--accent-color);
    font-size: 1.5rem;
}

.contact-item p {
    font-size: 1.1rem;
}

.contact-form {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--primary-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius-sm);
    font-family: var(--body-font);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-logo h3 {
    color: white;
    margin-bottom: var(--spacing-xs);
}

.footer-logo p {
    color: var(--gray-color);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: var(--light-color);
    transition: color var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--secondary-color);
    transform: translateY(-5px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--gray-color);
    font-size: 0.9rem;
}

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 992px) {
    html {
        font-size: 15px;
    }
    
    .timeline::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
        left: 0;
    }
    
    .timeline-item:nth-child(even) {
        left: 0;
    }
    
    .timeline-dot {
        left: 21px;
        right: auto;
    }
    
    .timeline-item:nth-child(even) .timeline-dot {
        left: 21px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        margin-bottom: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: var(--spacing-md) 0;
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links li {
        margin: var(--spacing-xs) 0;
    }

    .hamburger {
        display: block;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        margin-bottom: var(--spacing-md);
    }
    
    .about-details {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .footer-content {
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .section-title {
        font-size: 2rem;
    }
    
    .service-card, 
    .mentorship-card, 
    .project-card, 
    .skill-category, 
    .award-card {
        padding: var(--spacing-sm);
    }
}

/* WhatsApp Float Button */
.whatsapp-float {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 40px;
    right: 40px;
    background-color: #25d366;
    color: #FFF;
    border-radius: 50px;
    text-align: center;
    font-size: 30px;
    box-shadow: 2px 2px 3px #999;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.whatsapp-float:hover {
    background-color: #128C7E;
    transform: scale(1.1);
    color: white;
}

/* Section Buttons */
.section-buttons {
    margin-top: var(--spacing-lg);
    text-align: center;
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.section-buttons .btn {
    margin: 0; /* Override default button margin */
}