body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: #0d0d0f;
    min-height: 100vh;
    color: #e8e8f0;
    padding: 2rem 0;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.05) 1px, transparent 0);
    background-size: 3px 3px;
    opacity: 0.08;
    pointer-events: none;
    z-index: 0;
}

body > * {
    position: relative;
    z-index: 1;
}

h1 {
    text-align: center;
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

#navBar {
    margin: 0 auto 2rem auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 85%;
    max-width: 1100px;
    padding: 0.9rem 1.5rem;
    background: #13131a;
    border: 1px solid #2a2a3d;
    border-radius: 16px;
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.45);
}

#navBrand {
    font-size: 1.4rem;
    font-weight: 600;
    color: #e8e8f0;
    letter-spacing: 0.02em;
}

#navLinks {
    display: flex;
    gap: 1rem;
}

.navLink {
    text-decoration: none;
    color: #6b6b8a;
    font-weight: 600;
    padding: 0.3rem 0.2rem;
    border-bottom: 2px solid transparent;
}

.navLink.active {
    color: #39ff8f;
    border-bottom-color: #39ff8f;
}

#Main {
    margin: 0 auto 2rem auto;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 2rem 3rem;
    background: #13131a;
    border-radius: 20px;
    border: 1px solid #2a2a3d;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
    width: 80%;
    max-width: 1000px;
}

#ViewMain {
    margin: 0 auto 2rem auto;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 2rem 3rem;
    background: #13131a;
    border-radius: 20px;
    border: 1px solid #2a2a3d;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
    width: 80%;
    max-width: 1000px;
}

#formula {
    flex: 1;
    padding: 0.8rem 1.2rem;
    font-size: 1.3rem;
    border-radius: 12px;
    border: 1px solid #2a2a3d;
    background: #171720;
    color: #e8e8f0;
}

#formula::placeholder {
    color: #6b6b8a;
}

input[type="file"] {
    color: #6b6b8a;
}

button {
    padding: 0.8rem 1.6rem;
    font-size: 1.2rem;
    border-radius: 12px;
    border: none;
    background: #7c6af7;
    color: #0d0d0f;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
    box-shadow: 0 8px 18px rgba(124, 106, 247, 0.35);
}

button:hover {
    transform: translateY(-1px);
    background: #8c7cff;
}

button:active {
    transform: translateY(0);
    background: #6b5be6;
}

#modeToggle {
    width: 100%;
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
    font-size: 1.1rem;
    color: #e8e8f0;
}

#modeToggle input[type="radio"] {
    accent-color: #39ff8f;
}

.modeToggle {
    width: 100%;
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
    font-size: 1.1rem;
    color: #e8e8f0;
}

.modeToggle input[type="radio"] {
    accent-color: #39ff8f;
}

#statusBar {
    width: 100%;
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    border: 1px solid #2a2a3d;
    background: #101018;
    color: #6b6b8a;
    font-size: 0.95rem;
    min-height: 1.2rem;
}

#statusBar[data-state="success"] {
    color: #39ff8f;
    border-color: #2a3d2f;
}

#statusBar[data-state="error"] {
    color: #ff6b6b;
    border-color: #4b2a35;
}

.statusBar {
    width: 95%;
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    border: 1px solid #2a2a3d;
    background: #101018;
    color: #6b6b8a;
    font-size: 0.95rem;
    min-height: 1.2rem;
}

.statusBar[data-state="success"] {
    color: #39ff8f;
    border-color: #2a3d2f;
}

.statusBar[data-state="error"] {
    color: #ff6b6b;
    border-color: #4b2a35;
}

#viewStatusBar {
    width: 100%;
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    border: 1px solid #2a2a3d;
    background: #101018;
    color: #6b6b8a;
    font-size: 0.95rem;
    min-height: 1.2rem;
}

#viewStatusBar[data-state="success"] {
    color: #39ff8f;
    border-color: #2a3d2f;
}

#viewStatusBar[data-state="error"] {
    color: #ff6b6b;
    border-color: #4b2a35;
}

.content {
    width: 100%;
    display: flex;
    justify-content: center;
}

.page {
    display: none;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

#page2d img {
    max-width: 80%;
    border-radius: 20px;
    border: 1px solid #2a2a3d;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

#viewer3d {
    position: relative;
    width: 700px;
    height: 700px;
    background: #13131a;
    border-radius: 28px;
    border: 1px solid #2a2a3d;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

#viewLayout {
    margin: 0 auto 2rem auto;
    width: 80%;
    max-width: 1100px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.viewerPanel {
    background: #13131a;
    border: 1px solid #2a2a3d;
    border-radius: 20px;
    padding: 1rem;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

#view2d img {
    width: 100%;
    border-radius: 16px;
    border: 1px solid #2a2a3d;
}

.viewerContent {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.viewer2d img {
    width: 100%;
    border-radius: 16px;
    border: 1px solid #2a2a3d;
}

.viewer3d {
    position: relative;
    width: 100%;
    height: 360px;
    background: #13131a;
    border-radius: 16px;
    border: 1px solid #2a2a3d;
}

#viewer3dSingle {
    position: relative;
    width: 100%;
    height: 480px;
    background: #13131a;
    border-radius: 16px;
    border: 1px solid #2a2a3d;
}

#nav3d {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    align-items: center;
}

#indexLabel {
    font-size: 1.1rem;
    color: #6b6b8a;
}