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

:root {
    --primary: #6c5ce7;
    --primary-dark: #5b4cdb;
    --secondary: #00cec9;
    --dark: #2d3436;
    --darker: #1a1a2e;
    --light: #dfe6e9;
    --white: #ffffff;
    --error: #e74c3c;
    --success: #00b894;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--darker) 0%, #16213e 50%, var(--dark) 100%);
    color: var(--light);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: rgba(0, 0, 0, 0.3);
    padding: 30px 0;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

header h1 {
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: 10px;
}

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

header .branding {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
    margin-top: 8px;
}

main {
    padding: 30px 0;
}

.hidden {
    display: none !important;
}

.loading-screen {
    text-align: center;
    padding: 100px 20px;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.setup-panel {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 30px;
}

.setup-panel h2 {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.setup-desc {
    color: var(--light);
    margin-bottom: 25px;
}

.steps {
    background: rgba(108, 92, 231, 0.1);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 25px;
}

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.step:last-child {
    margin-bottom: 0;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    font-weight: bold;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.step a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
}

.step a:hover {
    text-decoration: underline;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--light);
    font-weight: 500;
}

.form-group small {
    display: block;
    margin-top: 6px;
    font-size: 0.8rem;
    color: rgba(223, 230, 233, 0.6);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

textarea,
input[type="text"],
input[type="number"],
input[type="password"],
select {
    width: 100%;
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--white);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

textarea:focus,
input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.btn {
    padding: 14px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    width: 100%;
    margin-top: 10px;
}

.btn.primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(108, 92, 231, 0.4);
}

.btn.primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.back-btn {
    width: auto;
    margin-top: 15px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin-top: 30px;
}

.feature-card {
    background: rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.feature-card strong {
    color: var(--white);
    display: block;
    margin-bottom: 5px;
}

.feature-card p {
    font-size: 0.85rem;
    color: rgba(223, 230, 233, 0.7);
}

/* Progress */
#progress-section {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 30px;
}

#progress-section h3 {
    color: var(--white);
    margin-bottom: 15px;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    transition: width 0.3s ease;
    border-radius: 10px;
}

#progress-text {
    text-align: center;
    color: var(--secondary);
    font-weight: 600;
}

#progress-stages {
    margin-top: 15px;
}

.stage-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    font-size: 0.9rem;
}

.stage-icon {
    font-size: 1rem;
}

.stage-done {
    color: var(--success);
}

.stage-active {
    color: var(--primary);
}

.stage-waiting {
    color: rgba(223, 230, 233, 0.4);
}

#progress-log {
    font-size: 0.8rem;
    color: var(--light);
    margin-top: 10px;
    font-family: monospace;
    opacity: 0.7;
}

/* Frames Preview */
#frames-preview {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 30px;
}

#frames-preview h3 {
    color: var(--white);
    margin-bottom: 15px;
}

.frames-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}

.frame-item {
    aspect-ratio: 16/9;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.frame-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.frame-num {
    position: absolute;
    bottom: 5px;
    right: 5px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* Output Section */
#output-section {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    margin-bottom: 30px;
}

#output-section h3 {
    color: var(--success);
    margin-bottom: 20px;
}

#output-video {
    width: 100%;
    max-width: 700px;
    border-radius: 12px;
    margin-bottom: 20px;
    background: #000;
}

.output-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.output-actions .btn {
    width: auto;
    max-width: 250px;
}

/* Tools Section */
#tools-section {
    margin-top: 30px;
}

#tools-section h2 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.tool-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.tool-card:hover {
    background: rgba(108, 92, 231, 0.15);
    border-color: var(--primary);
    transform: translateY(-3px);
}

.tool-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 15px;
}

.tool-card h3 {
    color: var(--white);
    margin-bottom: 8px;
}

.tool-card p {
    font-size: 0.85rem;
    color: rgba(223, 230, 233, 0.7);
}

.tool-panel {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 20px;
}

.tool-panel h2 {
    color: var(--white);
    margin-bottom: 20px;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.preview-item {
    position: relative;
    aspect-ratio: 16/9;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.preview-item img,
.preview-item video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-item .remove {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--error);
    color: var(--white);
    border: none;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

input[type="file"] {
    padding: 15px;
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

input[type="file"]:hover {
    border-color: var(--primary);
    background: rgba(108, 92, 231, 0.1);
}

footer {
    text-align: center;
    padding: 25px;
    margin-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--light);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .features-grid,
    .tools-grid {
        grid-template-columns: 1fr;
    }

    .setup-panel,
    .tool-panel {
        padding: 20px;
    }

    .output-actions {
        flex-direction: column;
        align-items: center;
    }

    .output-actions .btn {
        width: 100%;
    }
}