/* --- Themes & Color Palettes --- */
:root { /* Light Theme (default) */
    --bg-color: #f0f2f5;
    --surface-color: #ffffff;
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --text-color: #1c1e21;
    --subtle-text-color: #606770;
    --border-color: #dddfe2;
    --input-bg-color: #f5f6f7;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body.dark-theme {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #3b82f6;
    --primary-hover-color: #60a5fa;
    --text-color: #e0e0e0;
    --subtle-text-color: #a0a0a0;
    --border-color: #333;
    --input-bg-color: #2c2c2c;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

/* --- Global Styles --- */
body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

/* --- UI Buttons (Menu, Theme) --- */
#theme-switcher, #hamburger-btn, .close-button {
    position: absolute;
    top: 20px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: background-color 0.3s, border-color 0.3s;
    z-index: 1002;
    padding: 0;
}
#theme-switcher { right: 20px; }
#hamburger-btn { left: 20px; }

#theme-switcher svg, #hamburger-btn svg {
    fill: var(--text-color);
    transition: fill 0.3s;
}
.moon-icon { display: none; }
body.dark-theme .moon-icon { display: block; }
body.dark-theme .sun-icon { display: none; }

/* --- Main Container & Animations --- */
.container {
    width: 100%;
    max-width: 650px;
    background-color: var(--surface-color);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 8px 32px var(--shadow-color);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
    animation: fadeInScaleUp 0.8s ease-out forwards;
}

@keyframes fadeInScaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* --- Side Menu, Modal, and Overlay --- */
#side-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100%;
    background-color: var(--surface-color);
    box-shadow: 4px 0 15px rgba(0,0,0,0.2);
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    z-index: 1001;
    display: flex;
    flex-direction: column;
}
#side-menu.open {
    transform: translateX(0);
}
#close-menu-btn {
    align-self: flex-end;
    font-size: 36px;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    margin: 10px;
    color: var(--text-color);
}

#side-menu ul {
    list-style: none;
    padding: 20px;
    margin: 0;
}
#side-menu ul li a {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    padding: 15px 10px;
    font-size: 18px;
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
}
#side-menu ul li a:hover {
    background-color: var(--primary-color);
    color: white;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1002;
}
.modal-content {
    background: var(--surface-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    width: 90%;
    max-width: 500px;
    position: relative;
    animation: fadeInScaleUp 0.3s ease-out forwards;
}
.close-button {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 28px;
    color: var(--text-color);
}

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: none;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}
#overlay.visible {
    display: block;
    opacity: 1;
}
.modal.visible {
    display: flex;
}

/* --- (All other existing styles from previous steps) --- */
.logo { width: 120px; height: auto; margin-bottom: 20px; }
h1 { color: var(--text-color); margin-top: 0; margin-bottom: 10px; }
p { color: var(--subtle-text-color); margin-top: 0; }
.mode-switcher { display: flex; justify-content: center; background-color: var(--input-bg-color); border-radius: 8px; padding: 5px; margin: 30px auto; border: 1px solid var(--border-color); max-width: 300px; }
.tab-button { flex-grow: 1; padding: 10px 20px; border: none; background-color: transparent; color: var(--subtle-text-color); font-size: 16px; font-weight: 600; font-family: 'Poppins', sans-serif; border-radius: 6px; cursor: pointer; transition: background-color 0.3s, color 0.3s; }
.tab-button.active { background-color: var(--primary-color); color: white; }
.generator-panel.hidden { display: none; }
.input-area { margin: 30px 0; }
textarea { width: 100%; padding: 14px; border-radius: 8px; border: 1px solid var(--border-color); background-color: var(--input-bg-color); color: var(--text-color); font-size: 16px; font-family: 'Poppins', sans-serif; resize: vertical; box-sizing: border-box; transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s, color 0.3s; }
textarea:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 30%, transparent); }
button { background-color: var(--primary-color); color: white; border: none; padding: 14px 28px; border-radius: 8px; font-size: 16px; font-weight: 600; font-family: 'Poppins', sans-serif; cursor: pointer; margin-top: 15px; transition: background-color 0.3s, transform 0.2s; }
button:hover { background-color: var(--primary-hover-color); transform: translateY(-2px); }
button:disabled { background-color: color-mix(in srgb, var(--primary-color) 50%, var(--surface-color)); cursor: not-allowed; transform: none; }
.upload-label { display: block; padding: 14px; border: 1px dashed var(--border-color); border-radius: 8px; background-color: var(--input-bg-color); cursor: pointer; transition: border-color 0.3s, background-color 0.3s; text-align: center; color: var(--subtle-text-color); }
#image-upload { display: none; }
.upload-label:hover { border-color: var(--primary-color); background-color: color-mix(in srgb, var(--input-bg-color) 80%, var(--primary-color)); }
.result-area { margin-top: 30px; min-height: 300px; display: flex; justify-content: center; align-items: center; border: 2px dashed var(--border-color); border-radius: 12px; padding: 10px; transition: border-color 0.3s; }
#result-image { max-width: 100%; max-height: 512px; border-radius: 8px; display: none; }
.loading-spinner { border: 6px solid var(--border-color); border-top: 6px solid var(--primary-color); border-radius: 50%; width: 50px; height: 50px; animation: spin 1s linear infinite; }
.hidden { display: none; }
#result-video { max-width: 100%; max-height: 512px; border-radius: 8px; display: none; background-color: #000; }
.footer-links { margin-top: 40px; display: flex; align-items: center; justify-content: center; gap: 24px; }
.footer-link-item { display: flex; align-items: center; gap: 8px; color: var(--subtle-text-color); text-decoration: none; font-size: 14px; transition: color 0.3s; }
.footer-link-item svg { fill: var(--subtle-text-color); transition: fill 0.3s; }
.footer-link-item:hover { color: var(--primary-color); }
.footer-link-item:hover svg { fill: var(--primary-color); }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }