:root {
    --bg-color: #0f172a;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --gradient-1: #3b82f6;
    --gradient-2: #8b5cf6;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

.background-animation {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15) 0%, rgba(15, 23, 42, 0) 50%);
    animation: rotate 20s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.container {
    width: 100%;
    max-width: 800px;
    padding: 3rem;
    margin: 2rem;
    z-index: 1;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.6);
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

textarea, select {
    width: 100%;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
    resize: vertical;
}

textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

option {
    background: var(--bg-color);
    color: var(--text-primary);
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    box-shadow: 0 10px 20px -10px var(--gradient-1);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Spinner Animation */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    position: absolute;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

#result-container {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

#result-container h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    text-align: center;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    background: #000;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#status-message {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-secondary);
    font-style: italic;
}
.tabs-nav { display: flex; justify-content: center; gap: 1rem; margin-bottom: 2rem; flex-wrap: wrap; }
.tab-btn { background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-secondary); padding: 0.8rem 1.5rem; border-radius: 20px; cursor: pointer; font-weight: 500; transition: all 0.3s ease; backdrop-filter: blur(10px); }
.tab-btn:hover { color: var(--text-primary); background: rgba(59, 130, 246, 0.1); }
.tab-btn.active { background: var(--accent-color); color: white; border-color: var(--accent-hover); box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4); }
.tab-pane { display: none; animation: fadeIn 0.4s ease; background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 16px; padding: 2rem; box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2); backdrop-filter: blur(12px); }
.tab-pane.active { display: block; }
.magic-btn { position: absolute; bottom: 15px; right: 15px; background: linear-gradient(135deg, #a855f7, #9333ea); color: white; border: none; padding: 0.5rem 1rem; border-radius: 12px; cursor: pointer; font-weight: 600; font-size: 0.9rem; transition: all 0.3s ease; box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4); z-index: 10; }
.magic-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(168, 85, 247, 0.6); }
.magic-btn:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }
.result-box { margin-top: 20px; padding: 15px; background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 8px; }
.story-prompt-item { background: rgba(0,0,0,0.2); padding: 1rem; border-radius: 8px; border-left: 4px solid var(--accent-color); display: flex; flex-direction: column; gap: 0.5rem; }
.story-prompt-item button { align-self: flex-start; padding: 0.4rem 0.8rem; font-size: 0.9rem; background: var(--accent-color); color: white; border: none; border-radius: 8px; cursor: pointer; }

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        align-items: flex-start;
        padding-top: 1rem;
        padding-bottom: 1rem;
        height: auto;
    }
    .container {
        padding: 1.5rem;
        margin: 1rem;
        width: calc(100% - 2rem);
    }
    h1 {
        font-size: 2rem;
    }
    header {
        margin-bottom: 1.5rem;
    }
    .tab-pane {
        padding: 1.5rem;
    }
    .tabs-nav {
        gap: 0.5rem;
    }
    .tab-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
    #install-app-btn {
        top: 10px !important;
        right: 10px !important;
        padding: 8px 12px !important;
        font-size: 0.85rem;
    }
}