:root {
    /* --- NEW: Gradient Background Colors --- */
    --bg-gradient-start-light: #f8f9fa;
    --bg-gradient-end-light: #e9ecef;
    --bg-gradient-start-dark: #242528;
    --bg-gradient-end-dark: #1e1f20;

    /* Light Theme */
    --text-color-light: #212529;
    --card-bg-light: #ffffff;
    --header-footer-bg-light: #e9ecef;
    --link-color-light: #007bff;
    --border-color-light: #dee2e6;
    --spotlight-color-light: rgba(0, 86, 179, 0.1);

    /* Dark Theme (Google AI Studio Inspired) */
    --text-color-dark: #e8eaed;
    --card-bg-dark: #2a2b2e;
    --header-footer-bg-dark: #242528;
    --link-color-dark: #8ab4f8;
    --border-color-dark: #3c4043;
    --spotlight-color-dark: rgba(138, 180, 248, 0.08);
}

/* Mouse Follower Spotlight */
#cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: -1;
    transition: background 0.3s ease-out;
}
body.light-mode #cursor-glow {
    background: radial-gradient(circle, var(--spotlight-color-light) 0%, transparent 60%);
}
body.dark-mode #cursor-glow {
    background: radial-gradient(circle, var(--spotlight-color-dark) 0%, transparent 60%);
}


html {
    scroll-behavior: smooth;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    transition: color 0.3s;
    /* --- NEW: Gradient background --- */
    background-attachment: fixed;
}

body.light-mode {
    color: var(--text-color-light);
    background-color: var(--bg-gradient-end-light); /* Fallback */
    background-image: linear-gradient(135deg, var(--bg-gradient-start-light), var(--bg-gradient-end-light));
}

body.dark-mode {
    color: var(--text-color-dark);
    background-color: var(--bg-gradient-end-dark); /* Fallback */
    background-image: linear-gradient(135deg, var(--bg-gradient-start-dark), var(--bg-gradient-end-dark));
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
.main-header {
    padding: 15px 0;
    border-bottom: 1px solid;
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
}
body.light-mode .main-header { border-color: var(--border-color-light); background-color: rgba(244,244,244, 0.8); }
body.dark-mode .main-header { border-color: var(--border-color-dark); background-color: rgba(30, 31, 32, 0.8); }

.main-header .container {
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.nav-link {
    text-decoration: none;
    margin-right: 25px;
    font-weight: 500;
    transition: color 0.2s;
}
body.light-mode .nav-link { color: var(--text-color-light); }
body.dark-mode .nav-link { color: var(--text-color-dark); }
.nav-link:hover {
    color: var(--link-color-light);
}
body.dark-mode .nav-link:hover { color: var(--link-color-dark); }

/* Theme Toggle Button Style */
#theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}
#theme-toggle:hover {
    background-color: rgba(128, 128, 128, 0.2);
}
#theme-toggle svg {
    width: 24px;
    height: 24px;
}
/* --- FIXED: Icon display logic --- */
.sun-icon, .moon-icon {
    display: none; /* Hide both by default */
}
body.light-mode .moon-icon {
    display: block;
    fill: var(--text-color-light);
}
body.dark-mode .sun-icon {
    display: block;
    fill: var(--text-color-dark);
}


/* Main Content & Sections */
main {
    padding-top: 60px;
}
section {
    padding: 60px 0;
    border-bottom: 1px solid;
}
section:last-of-type {
    border-bottom: none;
}
body.light-mode section { border-color: var(--border-color-light); }
body.dark-mode section { border-color: var(--border-color-dark); }

.hero h1 { font-size: 3rem; margin: 0; }
.hero h2 { font-size: 1.5rem; margin: 10px 0; font-weight: 400; }
.hero .intro { font-size: 1.1rem; max-width: 700px; }
section h2 { font-size: 2rem; margin-bottom: 40px; }

/* Skill Sections */
.skill-section {
    margin-bottom: 50px;
}
.skill-section h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}
.skill-description {
    max-width: 800px;
    margin-bottom: 30px;
    line-height: 1.6;
}


/* Project Cards */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.project-card {
    display: flex;
    flex-direction: column;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.3s, border-color 0.3s;
}
.project-card.placeholder {
    opacity: 0.7;
}

/* Card Hover Effect */
.project-card:hover {
    transform: translateY(-5px);
}
body.light-mode .project-card:hover { box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
body.dark-mode .project-card:hover { box-shadow: 0 5px 15px rgba(0,0,0,0.3); }

body.light-mode .project-card {
    background-color: var(--card-bg-light);
    border-color: var(--border-color-light);
}
body.dark-mode .project-card {
    background-color: var(--card-bg-dark);
    border-color: var(--border-color-dark);
}

/* Line breaks inside cards */
.project-card h3 {
    padding-bottom: 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid;
}
.project-card p {
    flex-grow: 1;
    padding-bottom: 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid;
}
body.light-mode .project-card h3, body.light-mode .project-card p { border-color: var(--border-color-light); }
body.dark-mode .project-card h3, body.dark-mode .project-card p { border-color: var(--border-color-dark); }


.project-card a {
    margin-top: auto;
    font-weight: bold;
    text-decoration: none;
}
body.light-mode .project-card a { color: var(--link-color-light); }
body.dark-mode .project-card a { color: var(--link-color-dark); }

/* Contact Section */
#contact {
    text-align: center;
}
.contact-links {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}
.contact-button {
    display: inline-block;
    padding: 12px 25px;
    text-decoration: none;
    font-weight: 500;
    border-radius: 6px;
    border: 1px solid;
    transition: background-color 0.2s, color 0.2s, transform 0.2s;
}
.contact-button:hover {
    transform: translateY(-3px);
}
body.light-mode .contact-button {
    color: var(--text-color-light);
    border-color: var(--border-color-light);
}
body.dark-mode .contact-button {
    color: var(--text-color-dark);
    border-color: var(--border-color-dark);
}
body.light-mode .contact-button:hover {
    background-color: var(--text-color-light);
    color: var(--bg-gradient-start-light);
}
body.dark-mode .contact-button:hover {
    background-color: var(--text-color-dark);
    color: var(--bg-gradient-start-dark);
}


/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}