/* --- THEME VARIABLES --- */
:root {
    --bg-color: #0a0a0a;
    --text-color: #e2e8f0;
    --particle-color: rgba(255, 255, 255, 0.7);
    --glow-color: rgba(29, 78, 216, 0.2);
    --card-bg: rgba(17, 24, 39, 0.8);
    --border-color: rgba(255, 255, 255, 0.1);
    --skill-bg: #1e293b;
    --skill-text: #94a3b8;
    --link-hover: #3b82f6;
    --timeline-color: #374151;
}

/* --- GENERAL STYLES --- */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

/* --- BACKGROUND & EFFECTS --- */
#particle-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background-color: var(--bg-color);
}

.hero-glow {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--glow-color), transparent 60%);
    transform: translate(-50%, -50%);
    filter: blur(100px);
    z-index: -1;
    pointer-events: none;
}

/* --- LAYOUT & SECTIONS --- */
.section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

.section:last-child {
    border-bottom: none;
}

/* --- PROJECT CARD STYLES --- */
#projects {
    perspective: 1500px;
}

.card {
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
    transform-style: preserve-3d;
    padding: 0;
    transform: translateZ(0);
    background-color: transparent;
    border-radius: 0.5rem;
}

.card:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 280px; 
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card.is-flipped .card-inner {
    transform: rotateY(180deg);
}

.card-face, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 0.5rem;
}

.card-face {
    justify-content: space-between;
}

.repo-description {
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
}

.card-back {
    transform: rotateY(180deg);
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* --- UI COMPONENTS --- */
.skill-tag {
    background-color: var(--skill-bg);
    color: var(--skill-text);
    transition: all 0.2s ease;
}

.skill-tag:hover {
    background-color: #3b82f6;
    color: #ffffff;
}

.nav-link {
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--link-hover);
}

.cert-card {
    transition: transform 0.3s ease, color 0.3s ease;
}
.cert-card:hover {
    transform: translateY(-5px);
    color: var(--link-hover);
}

#contact-form input, #contact-form textarea {
    background-color: var(--skill-bg);
    border: 1px solid var(--border-color);
}

/* --- ANIMATIONS --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item {
    opacity: 0;
    transform: translateX(-30px);
}

/* --- ARSENAL / TOOLKIT SECTION --- */
.tool-card-container {
    perspective: 1000px;
    min-height: 140px;
}

.tool-card {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.7s, box-shadow 0.3s, border-color 0.3s;
    transform-style: preserve-3d;
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.tool-card-container:hover .tool-card {
    transform: rotateY(180deg);
}

.tool-card-container:hover {
    filter: drop-shadow(0 5px 20px rgba(0, 0, 0, 0.2));
}

.tool-card-face,
.tool-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    color: var(--skill-text);
    border-radius: 0.5rem;
}

.tool-card-face i {
    color: var(--link-hover);
}

.tool-card-back {
    background-color: #1e293b; /* A slightly different bg for the back */
    transform: rotateY(180deg);
}

/* --- TIMELINE LIST ITEM INITIAL STATE FOR ANIMATION --- */
.timeline-item ul li {
    opacity: 0;
    transform: translateX(-20px);
}

/* --- DESKTOP-SPECIFIC INTERACTIONS (HOVER-TO-FLIP CARD) --- */
@media (hover: hover) and (min-width: 1024px) {
    .card:hover .card-inner {
        transform: rotateY(180deg);
    }
}

/* --- Featured Project Showcase --- */
#featured-project {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.featured-card {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
    background-color: rgba(17, 24, 39, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 2rem;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

@media (min-width: 1024px) {
    .featured-card {
        grid-template-columns: 3fr 2fr;
        padding: 3rem;
    }
}

.featured-image img {
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

.featured-image img:hover {
    transform: scale(1.03);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-stack span {
    background-color: rgba(59, 130, 246, 0.2);
    color: #60a5fa; /* blue-400 */
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.cta-button {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: all 0.2s ease;
}

.cta-button.primary {
    background-color: #2563eb; /* blue-600 */
    color: white;
}
.cta-button.primary:hover {
    background-color: #1d4ed8; /* blue-700 */
}

.cta-button.secondary {
    background-color: transparent;
    color: #e2e8f0; /* slate-200 */
    border: 1px solid #334155; /* slate-700 */
}
.cta-button.secondary:hover {
    background-color: #1e293b; /* slate-800 */
    border-color: #475569; /* slate-600 */
}