:root {
    --bg-color: #333333;
    --panel-bg: rgba(30, 30, 30, 0.8);
    --accent-color: #007aff;
    --text-color: #ffffff;
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
}

header {
    padding: 1rem 2rem;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 10;
    pointer-events: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1,
.btn-new {
    pointer-events: auto;
}

.btn-new {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0.8;
}

.btn-new:hover {
    background: rgba(255, 255, 255, 0.2);
    opacity: 1;
}

h1 {
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    opacity: 0.8;
}

#viewport-container {
    flex: 1;
    position: relative;
    width: 100%;
    height: 100%;
}

#three-canvas-container {
    width: 100%;
    height: 100%;
    touch-action: none;
    /* Prevent browser scroll/zoom during 3D interaction */
}

#ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#drop-zone,
#controls,
#share-modal {
    pointer-events: auto;
}

/* Drop Zone */
#drop-zone {
    pointer-events: auto;
    width: 80%;
    max-width: 500px;
    height: 300px;
    border: 2px dashed var(--glass-border);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--panel-bg);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    cursor: pointer;
}

#drop-zone.hover {
    border-color: var(--accent-color);
    background: rgba(0, 122, 255, 0.1);
}

#drop-zone.hidden {
    display: none;
}

.drop-zone-content {
    text-align: center;
    pointer-events: none;
}

.drop-zone-content svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.drop-zone-content p {
    font-size: 1rem;
    line-height: 1.6;
    opacity: 0.8;
}

.drop-zone-content span {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Controls */
#controls {
    pointer-events: auto;
    position: absolute;
    bottom: 2rem;
    display: flex;
    gap: 1rem;
    background: var(--panel-bg);
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    transition: opacity 0.5s ease;
    z-index: 20;
    max-width: 90%;
}

#controls.hidden {
    opacity: 0;
    pointer-events: none;
}

.control-group {
    display: flex;
    align-items: center;
}

.control-group:not(:last-child) {
    border-right: 1px solid var(--glass-border);
    padding-right: 1rem;
}

button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    transition: transform 0.2s ease, opacity 0.2s ease;
    opacity: 0.7;
}

button:hover {
    opacity: 1;
    transform: scale(1.1);
}

button:active {
    transform: scale(0.95);
}

#page-info {
    font-variant-numeric: tabular-nums;
    font-size: 0.9rem;
    min-width: 60px;
    text-align: center;
}

/* Loading Overlay */
#loading-overlay,
#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 3000;
    color: white;
    backdrop-filter: blur(5px);
}

.loader {
    width: 48px;
    height: 48px;
    border: 5px solid #FFF;
    border-bottom-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Modal Styling */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    max-width: 90%;
    width: 450px;
    border: 1px solid var(--glass-border);
}

.modal-content h3 {
    margin-bottom: 1rem;
    font-weight: 300;
}

.modal-content p {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 1.5rem;
}

.url-copy-box {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.url-copy-box input,
.url-copy-box textarea {
    flex: 1;
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.3);
    color: white;
    font-family: inherit;
    font-size: 0.9rem;
    resize: none;
}

.btn-primary {
    background: var(--accent-color) !important;
    padding: 0.5rem 1rem !important;
    border-radius: 25px !important;
    opacity: 1 !important;
    font-weight: 500;
}

#copy-url,
#copy-embed,
#close-modal {
    background: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    white-space: nowrap;
}

#close-modal {
    background: rgba(255, 255, 255, 0.1);
    width: 100%;
}

.hidden {
    display: none !important;
}