/*
  STYLE.CSS (V3 - Final)
  Portfolio for V. Hariharan
*/

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

/* --- Root Variables & Global Styles --- */
:root {
    --primary-color-start: #020c1b;
    --primary-color-end: #0a192f;
    --accent-color: #64ffda;
    --text-light: #ccd6f6;
    --text-dark: #8892b0;
    --card-bg: #112240;
    --border-color: #233554;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, var(--primary-color-start), var(--primary-color-end));
    background-attachment: fixed;
    color: var(--text-dark);
    line-height: 1.8;
    font-size: 18px; /* INCREASED BASE FONT SIZE */
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
}

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

/* INCREASED FONT SIZES */
h1 { font-size: clamp(3rem, 6vw, 5rem); }
h2 { font-size: clamp(2.5rem, 5vw, 3.5rem); margin-bottom: 2.5rem; }
h3 { font-size: 1.8rem; margin-bottom: 1rem;}
h4 { font-size: 1.4rem; }
p { font-size: 1.1rem; margin-bottom: 1.25rem; }

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

a:hover {
    filter: brightness(1.2);
}

strong {
    color: var(--accent-color);
    font-weight: 600;
}

/* --- Header & Navigation --- */
.header {
    background-color: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}
.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
/* REPLACE WITH THESE THREE RULES */
.header-logo {
    display: flex;
    align-items: center;
    text-decoration: none; /* Removes underline from title */
}

.header-logo img {
    height: 50px;
    width: 50px;
    border-radius: 50%;
    border: 2px solid var(--accent-color);
}

/* THIS IS THE CORRECTED CODE */
.header-title {
    color: var(--text-light);
    font-size: 1.3rem;
    font-weight: 600;
    margin-left: 15px; /* Adds space next to the logo */
}
/* The extra brace is now gone */
/* MODIFIED CSS rule in style.css */
/* REPLACE WITH THIS NEW, CORRECTED BLOCK */
.nav-links ul {
    display: flex;
    flex-direction: row;  /* THIS IS THE KEY: Forces horizontal layout */
    align-items: center;  /* Vertically aligns items in the middle */
    list-style: none;     /* Removes bullet points */
    margin: 0;            /* Resets any browser default margin */
    padding: 0;           /* Resets any browser default padding */
}

.nav-links li {
    /* This applies space ONLY to the left of each item */
    margin: 0 0 0 35px;
}

.nav-links a {
    display: block; /* Ensures padding is applied correctly */
    color: var(--text-light);
    font-weight: 500;
    font-size: 1.1rem;
    padding: 5px 0; /* Adds some vertical space for the underline */
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.nav-links a.active,
.nav-links a:hover {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 1.1rem;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid var(--accent-color);
    margin: 0.5rem;
}
.btn-primary {
    background-color: var(--accent-color);
    color: var(--primary-color-start);
}
.btn-primary:hover {
    background-color: transparent;
    color: var(--accent-color);
}

/* --- Sections & Hero --- */
.section {
    padding: 6rem 0;
}
/* REPLACEMENT CSS for style.css */
.hero {
    display: flex;
    flex-direction: column; /* Stacks items vertically */
    align-items: center;   /* Centers items horizontally */
    justify-content: center; /* Centers items vertically */
    text-align: center;      /* Centers the text inside */
    min-height: 85vh;
}
.hero-text .subtitle {
    font-size: clamp(1.5rem, 4vw, 2rem);
    color: var(--text-light);
    margin: 1rem 0;
}
.hero-text .description {
    font-size: 1.2rem;
    max-width: 650px;
    margin-bottom: 2.5rem;
}
.hero-image img {
    max-width: 320px;
    border-radius: 50%;
    border: 5px solid var(--accent-color);
    box-shadow: 0 0 40px rgba(100, 255, 218, 0.2);
}

/* --- Skills Section --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
}
.skill-category h3 {
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}
.skill-category ul { list-style: none; }
.skill-category li {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%2364ffda" class="bi bi-arrow-right-short" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M4 8a.5.5 0 0 1 .5-.5h5.793L8.146 5.354a.5.5 0 1 1 .708-.708l3 3a.5.5 0 0 1 0 .708l-3 3a.5.5 0 0 1-.708-.708L10.293 8.5H4.5A.5.5 0 0 1 4 8z"/></svg>') no-repeat left 8px;
    padding-left: 25px;
}

/* --- Projects Page Layout --- */
.project-showcase {
    display: flex;
    flex-direction: column;
    gap: 5rem;
}
.project-card {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}
.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}
.project-card h3 {
    color: var(--accent-color);
}
.project-card .tools {
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}
.project-card img {
    width: 100%;
    border-radius: 6px;
    margin-bottom: 2rem;
}
/* REPLACE THE OLD .project-links RULE WITH THIS BLOCK */

.project-links {
    margin-top: 2.5rem;
    display: flex; /* Aligns buttons in a row */
    align-items: center; /* Vertically centers the buttons */
    gap: 1rem; /* Adds space between the buttons */
    flex-wrap: wrap; /* Allows buttons to wrap on smaller screens */
}

/* This targets the new 'Know More' button */
.btn-secondary {
    background-color: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: 14px 32px; /* Ensures same size as primary button */
    font-size: 1.1rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer; /* Changes mouse to a pointer on hover */
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background-color: rgba(100, 255, 218, 0.1); /* Subtle hover effect */
}
/* ADD THESE NEW RULES to the end of the Projects Page Layout section */

.project-card p strong {
    color: var(--text-light);
}

.project-card ul {
    list-style: none;
    padding-left: 20px;
}

.project-card li {
    margin-bottom: 0.75rem;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%2364ffda" class="bi bi-arrow-right-short" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M4 8a.5.5 0 0 1 .5-.5h5.793L8.146 5.354a.5.5 0 1 1 .708-.708l3 3a.5.5 0 0 1 0 .708l-3 3a.5.5 0 0 1-.708-.708L10.293 8.5H4.5A.5.5 0 0 1 4 8z"/></svg>') no-repeat left 6px;
}

.project-card h4 {
    color: var(--accent-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.project-details-hidden {
    display: none; /* This hides the details by default */
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.7s ease-in-out;
}



/* --- About & Certificates Page --- */
.about-content {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 8px;
}
.certificates-showcase {
    margin-top: 5rem;
}
.certificate-card {
    text-align: center;
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 8px;
    margin-bottom: 3rem;
}
.certificate-card img {
    max-width: 60%; /* Makes image large, adjust as needed */
    height: auto;
    border-radius: 8px;
    margin: 0 auto 2.5rem auto;
    display: block;
    border: 1px solid var(--border-color);
}
.certificate-card h4 {
    color: var(--accent-color);
    font-size: 1.6rem;
}
.certificate-card p {
    max-width: 70ch;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.15rem;
}

/* --- Contact Page --- */
.contact-section { text-align: center; }
.contact-links-wrapper { margin-top: 3rem; }
.contact-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--text-light);
    margin: 1.5rem auto;
    max-width: 500px;
}
.contact-links svg {
    height: 30px;
    margin-right: 15px;
    fill: var(--accent-color);
}

/* --- Footer --- */
.footer {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}
.footer-social-links a { margin: 0 15px; display: inline-block; }
.footer-social-links svg {
    height: 28px;
    fill: var(--text-dark);
    transition: all 0.3s ease;
}
.footer-social-links a:hover svg {
    fill: var(--accent-color);
    transform: translateY(-3px);
}
.footer p { margin-top: 1.5rem; font-size: 1rem; }

/* --- Responsive Design --- */
@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-image {
        grid-row: 1;
        margin: 0 auto 3rem auto;
    }
    .certificate-card img { max-width: 80%; }
}


/* ADD THE .header-title RULE to this media query at the bottom of the file */
@media (max-width: 768px) {
    body { font-size: 16px; }
    .nav-links { display: none; }
    .header-title { display: none; } /* <-- ADD THIS NEW LINE */
    .section { padding: 4rem 0; }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    .project-card, .about-content, .certificate-card { padding: 1.5rem; }
    .certificate-card img { max-width: 100%; }
}