:root {
    --bg-gradient: linear-gradient(135deg, #09090b 0%, #18181b 100%);
    --primary-color: #3b82f6; /* Blueish */
    --primary-glow: rgba(59, 130, 246, 0.5);
    --accent-color: #facc15; /* Yellow for highlighting words */
    --accent-shadow: rgba(250, 204, 21, 0.6);
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --error-color: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 1000px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-weight: 800;
    font-size: 2.1rem;
    letter-spacing: -1px;
}

h1 span {
    color: var(--primary-color);
    text-shadow: 0 0 20px var(--primary-glow);
}

.api-key-container {
    display: flex;
    gap: 0.5rem;
}

input[type="password"] {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    outline: none;
    transition: all 0.3s ease;
    width: 250px;
    font-family: monospace;
}

input[type="password"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 12px var(--primary-glow);
}

button {
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    transition: all 0.3s ease;
}

#save-key-btn {
    padding: 0.8rem 1.25rem;
    background: var(--glass-bg);
    color: var(--text-color);
    border: 1px solid var(--glass-border);
}

#save-key-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.upload-zone {
    border: 2px dashed var(--glass-border);
    border-radius: 20px;
    padding: 5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    background: rgba(0,0,0,0.2);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px var(--primary-glow));
    transition: transform 0.3s ease;
}

.upload-zone:hover .upload-icon {
    transform: translateY(-5px);
}

.upload-zone h2 {
    margin-bottom: 0.5rem;
}

.upload-zone p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.upload-btn {
    padding: 0.85rem 2.5rem;
    background: var(--primary-color);
    color: white;
    font-size: 1rem;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

.hidden {
    display: none !important;
}

.player-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    animation: fadeIn 0.6s ease;
}

.video-wrapper {
    position: relative;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    background: #000;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
    aspect-ratio: 16 / 9;
    display: flex;
}

video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    outline: none;
}

/* Captions Overlay */
.caption-overlay {
    position: absolute;
    bottom: 8%;
    left: 8%;
    right: 8%;
    text-align: center;
    pointer-events: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-end;
    gap: 0.5rem;
}

.caption-word {
    font-size: 2.2rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.8);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.9), 0px 0px 8px rgba(0,0,0,0.5);
    transition: color 0.1s ease, transform 0.1s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    line-height: 1.2;
}

.caption-word.active {
    color: var(--accent-color);
    transform: scale(1.15) translateY(-3px);
    text-shadow: 0 0 15px var(--accent-shadow), 2px 2px 4px rgba(0,0,0,0.9);
}

.caption-word.past {
    color: var(--primary-color);
}

/* Controls Box */
.controls-panel {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    background: rgba(0,0,0,0.3);
    padding: 1.2rem 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.95rem;
    color: var(--text-muted);
}

#file-name {
    color: var(--text-color);
    font-weight: 600;
}

.text-btn {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--glass-border);
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.text-btn:hover {
    color: #fff;
    border-color: #fff;
}

.primary-btn {
    padding: 0.85rem 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), #2563eb);
    color: white;
    font-size: 1.05rem;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    background: var(--text-muted);
}

.processing-status {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--primary-color);
    font-weight: 600;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(59, 130, 246, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.error-message {
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: #fca5a5;
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsiveness */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1.5rem;
    }
    input[type="password"] {
        width: 100%;
    }
    .caption-word {
        font-size: 1.5rem;
    }
}

/* Style Select Dropdown */
.caption-style-selector {
    display: flex;
    align-items: center;
}

.style-select {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 0.6rem 1rem;
    border-radius: 10px;
    outline: none;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.style-select:hover, .style-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-glow);
}

.style-select option {
    background: #18181b;
    color: #fff;
}

/* Export Panel */
.export-panel {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 1rem;
    background: rgba(0,0,0,0.2);
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    margin-top: -0.5rem;
}

.export-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
}

.export-btn {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-radius: 8px;
}

.export-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* Format Breaks */
.flex-break {
    flex-basis: 100%;
    height: 0;
    margin: 0;
}

/* Recording Overlay */
.recording-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: 600;
}

.recording-text {
    margin-top: 15px;
    font-size: 1.2rem;
    color: var(--primary-color);
}

.primary-export {
    background: var(--primary-color);
    color: white;
}
.primary-export:hover {
    background: #2563eb;
    color: white;
}