:root {
    --bg-color: #000000;
    --text-color: #f5f5f7;
    --window-bg: #1c1c1e;
    --secondary-bg: #2c2c2e;
    --accent-color: #ffffff;
    --apple-radius: 12px;
    --btn-radius: 8px;
    --border-color: #38383a;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.window-frame.dark-mode {
    width: 100%;
    height: calc(100vh - 40px);
    background-color: var(--window-bg);
    border-radius: 18px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
    overflow: hidden;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.title-bar {
    background: linear-gradient(to bottom, #3a3a3c, #2c2c2e);
    height: 38px;
    display: flex;
    align-items: center;
    padding: 0 15px;
    border-bottom: 1px solid #000;
    position: relative;
    width: 100%;
    flex-shrink: 0;
}

.traffic-lights {
    display: flex;
    gap: 8px;
}

.light {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.red { background-color: #ff5f57; }
.yellow { background-color: #ffbd2e; }
.green { background-color: #28c940; }

.window-title {
    position: absolute;
    width: 100%;
    left: 0;
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    color: #a1a1a6;
    pointer-events: none;
}

.lang-selector {
    margin-left: auto;
    display: flex;
    gap: 4px;
    z-index: 2;
}

.lang-btn {
    background: none;
    border: none;
    color: #a1a1a6;
    font-size: 10px;
    font-weight: 700;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all 0.2s;
}

.lang-btn.active {
    color: #ffffff;
    background-color: #48484a;
}

.lang-btn:hover:not(.active) {
    color: #f5f5f7;
}

.window-content {
    padding: 0;
    flex: 1;
    overflow-y: auto;
}

.main-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    min-height: 85%;
}

.left-panel {
    padding: 60px 40px;
    border-right: 1px solid var(--border-color);
    background-color: #121214;
    display: flex;
    flex-direction: column;
}

.right-panel {
    padding: 60px 40px;
    background-color: var(--window-bg);
    display: flex;
    flex-direction: column;
}

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

.bottom-content {
    padding: 60px 40px;
    border-top: 1px solid var(--border-color);
    background-color: #0a0a0b;
}

.bottom-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

#action-area p {
    color: #a1a1a6;
    margin-bottom: 30px;
    font-size: 1rem;
}

.upload-area {
    margin-bottom: 30px;
}

.button-group {
    display: flex;
    gap: 12px;
}

.button-group button {
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--btn-radius);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-blue {
    background-color: #0a84ff;
    color: #fff;
}

.btn-blue:hover:not(:disabled) {
    background-color: #0071e3;
}

.btn-gray {
    background-color: #2c2c2e;
    color: #a1a1a6;
    border: 1px solid var(--border-color);
}

.btn-gray:hover:not(:disabled) {
    background-color: #3a3a3c;
    color: #f5f5f7;
}

button:disabled {
    background-color: #48484a;
    color: #8e8e93;
    cursor: not-allowed;
    border: none !important;
}

.selected-files-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

.file-chip {
    background-color: var(--secondary-bg);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border-color);
}

.remove-file {
    color: #ff453a;
    cursor: pointer;
    font-weight: bold;
}

.content-group {
    margin-bottom: 30px;
}

.bottom-grid .content-group {
    background-color: #161618;
    padding: 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    margin-bottom: 0;
}

.content-group h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: #ffffff;
}

.content-group p, .content-group ul, .content-group ol {
    font-size: 0.95rem;
    color: #a1a1a6;
    line-height: 1.7;
}

.highlight {
    color: #0a84ff;
    font-weight: 700;
}

.content-group ul, .content-group ol {
    list-style: none;
    padding-left: 0;
}

.process-visual.grid-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
    padding: 25px;
    background-color: var(--secondary-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.step img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    max-width: 200px;
    border-radius: 8px;
    border: 1px solid #48484a;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transition: transform 0.3s;
}

.step img:hover {
    transform: scale(1.03);
}

.step span {
    font-size: 0.85rem;
    color: #f5f5f7;
    font-weight: 600;
}

.faq-item {
    margin-bottom: 20px;
}

.faq-item strong {
    display: block;
    color: #f5f5f7;
    margin-bottom: 4px;
    font-size: 1.05rem;
}

.preview-grid {
    margin-top: 20px;
    padding-top: 30px;
}

.preview-item {
    margin-bottom: 0;
    padding: 20px;
    background-color: var(--secondary-bg);
    border-radius: 12px;
    text-align: center;
}

.preview-item img {
    width: 100%;
    max-height: 650px;
    object-fit: contain;
    border-radius: 4px;
}

.download-link {
    display: inline-block;
    margin-top: 15px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--btn-radius);
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    line-height: 1;
}

footer {
    padding: 30px;
    text-align: center;
    font-size: 0.8rem;
    color: #636366;
    border-top: 1px solid var(--border-color);
}

@media (max-width: 1024px) {
    .main-split, .bottom-grid {
        grid-template-columns: 1fr;
    }
    .left-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

/* Safe Loading Animation */
.dot-ani {
    animation: dot-blink 1.4s infinite ease-in-out;
    display: inline-block;
    color: #0a84ff; /* Apple Blue */
    font-weight: bold;
    font-size: 1.5rem;
    margin-left: 2px;
}

.dot-white {
    color: #ffffff !important;
    font-size: 1rem !important;
}

@keyframes dot-blink {
    0%, 80%, 100% { opacity: 0.2; transform: scale(1); }
    40% { opacity: 1; transform: scale(1.3); }
}