@keyframes slideInFromTop {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

:root {
    --bg-1: oklch(19% 0 0);
    --bg-2: oklch(23% 0 0);
    --bg-3: oklch(27% 0 0);
    --txt-1: oklch(90% 0 0);
    --txt-2: oklch(75% 0 0);
    --txt-3: oklch(50% 0 0);
    --txt-4: oklch(40% 0 0);
    --txt-err: oklch(70% 0.11 0);
    --font-family: 'Geist Mono', 'Geist Mono Variable', monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background: var(--bg-1);
    color: var(--txt-2);
    font-family: var(--font-family);
    font-weight: 400;
    font-size: 100%;
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden; 
}

/* Navigation */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    width: 100%;
    position: fixed;
    top: 0;
    z-index: 100;
}

.logo-text {
    color: var(--txt-2);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
    cursor: pointer;
    transition: color 0.2s ease;
}

.logo-text:hover {
    color: var(--txt-1);
}

.socials-container {
    display: flex;
    gap: 1rem;
}

.social-circle {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background-color: var(--bg-2);
    color: var(--txt-2);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.2s ease;
}

.social-circle:hover {
    background-color: var(--bg-3);
    color: var(--txt-1);
}

/* 3D Scene Setup */
main {
    animation: slideInFromTop 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 2000px;
    padding: 2rem;
}

.panel-wrapper {
    position: relative;
    width: 650px; 
    height: 400px; 
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.panel-wrapper.is-flipped {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

/* FRONT: Access Card */
.card-front {
    z-index: 2;
}

.panel-label {
    position: absolute;
    top: -16px;
    left: 20px;
    background-color: var(--bg-1);
    color: var(--txt-4);
    padding: 0 10px;
    z-index: 10;
    font-size: 1.4rem;
    font-weight: bold;
    text-transform: lowercase;
    transition: 0.2s;
}

.panel {
    padding: 3rem;
    border: 2px solid var(--bg-3);
    display: flex;
    gap: 3rem;
    background-color: var(--bg-1);
}

.card-image {
    width: 40%;
    aspect-ratio: 1/1;
    background-color: var(--bg-2);
    object-fit: cover;
    filter: brightness(70%);
    border-radius: 2em;
}

.card-content {
    flex: 1; 
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card-text {
    white-space: pre;
    font-size: 1.6rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

/* BACK: Project Grid Container */
.card-back {
    transform: rotateY(180deg);
    z-index: 1;
    width: 1200px; 
    height: 80vh;
    left: calc(50% - 600px); 
    top: calc(50% - 40vh);
}

.projects-scroll-container {
    width: 100%;
    height: 100%;
    overflow-y: auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-content: start;
}


.projects-scroll-container a {
    text-decoration: none;
}

.project-item {
    position: relative;
    border: 2px solid var(--bg-3);
    padding: 2rem;
    background: var(--bg-1);
    height: fit-content;
    transition: 0.2s;
}

.project-item:hover {
    border: 2px solid var(--txt-4);
    transition: 0.2s;
    cursor: pointer;
}

.project-item:hover .panel-label {
    color: var(--txt-3);
    transition: 0.2s;
}

.project-item .panel-label {
    font-size: 0.9rem;
    top: -12px;
    left: 15px;
}

.project-header {
    text-align: center;
    color: var(--txt-2);
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--bg-3);
    padding-bottom: 0.5rem;
}

.project-desc {
    color: var(--txt-3);
    font-size: 1rem;
}

/* Custom TUI Scrollbar */
.projects-scroll-container::-webkit-scrollbar { width: 8px; }
.projects-scroll-container::-webkit-scrollbar-track { background: var(--bg-1); }
.projects-scroll-container::-webkit-scrollbar-thumb { background: var(--bg-3); }

.enter-btn {
    background-color: var(--bg-2);
    border: 2px solid var(--bg-3);
    color: var(--txt-2);
    font-family: var(--font-family);
    padding: 10px 15px;
    cursor: pointer;
    width: 100%; 
    font-size: 1.3rem;
    text-transform: lowercase;
    font-weight: bold;
    transition: 0.2s;
}

.enter-btn:hover {
    background-color: var(--bg-3);
    color: var(--txt-1);
    transition: 0.2s;
}

/* Mobile */
@media (max-width: 1200px) {
    .card-back {
        width: 95vw;
        left: calc(50% - 47.5vw);
    }
}
@media (max-width: 650px) {
    .projects-scroll-container { grid-template-columns: 1fr; }
    .panel { flex-direction: column; padding: 1.5rem; }
    .card-image { width: 100%; }
    header { padding: 1rem; }
    .logo-text { font-size: 1.1rem; }
}

.icon {
    filter: invert(80%);
    width: 60%;
    height: 60%;
}