:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-surface: #1a1a24;
    --color-surface-hover: #22222e;
    --color-border: #2a2a38;
    --color-text: #e8e8ed;
    --color-text-muted: #8888a0;
    --color-accent: #ff6b35;
    --color-accent-glow: rgba(255, 107, 53, 0.3);
    --color-success: #4ade80;
    --color-paper: #faf9f7;
    --font-display: 'Crimson Pro', Georgia, serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

body.tema-claro {
    --color-bg: #f5f5f7;
    --color-bg-secondary: #ffffff;
    --color-surface: #ffffff;
    --color-surface-hover: #f0f0f2;
    --color-border: #d8d8e0;
    --color-text: #1a1a24;
    --color-text-muted: #6a6a7a;
    --color-accent: #e85a28;
    --color-accent-glow: rgba(232, 90, 40, 0.25);
}

body.tema-transicao,
body.tema-transicao *,
body.tema-transicao *::before,
body.tema-transicao *::after {
    transition: background-color 0.5s ease,
                border-color 0.5s ease,
                color 0.5s ease,
                box-shadow 0.5s ease !important;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.btn-tema {
    position: fixed;
    top: 24px;
    right: 24px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-tema:hover {
    transform: scale(1.1) rotate(15deg);
    border-color: var(--color-accent);
    box-shadow: 0 6px 25px var(--color-accent-glow);
}

.btn-tema:active {
    transform: scale(0.95);
}

.tema-icone {
    font-size: 1.5rem;
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.btn-tema:hover .tema-icone {
    transform: rotate(360deg);
}

.background-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(255, 107, 53, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(255, 107, 53, 0.05) 0%, transparent 50%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 100px,
            rgba(255, 107, 53, 0.02) 100px,
            rgba(255, 107, 53, 0.02) 101px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 100px,
            rgba(255, 107, 53, 0.02) 100px,
            rgba(255, 107, 53, 0.02) 101px
        );
}

body.tema-claro .background-pattern {
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(232, 90, 40, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(232, 90, 40, 0.04) 0%, transparent 50%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 100px,
            rgba(232, 90, 40, 0.03) 100px,
            rgba(232, 90, 40, 0.03) 101px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 100px,
            rgba(232, 90, 40, 0.03) 100px,
            rgba(232, 90, 40, 0.03) 101px
        );
}

.container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
}

.header {
    text-align: center;
    margin-bottom: 60px;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.logo-icon {
    font-family: var(--font-mono);
    font-size: 32px;
    font-weight: 500;
    letter-spacing: -2px;
}

.bracket {
    color: var(--color-accent);
}

.letter {
    color: var(--color-text);
    margin: 0 4px;
}

.header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -1px;
}

.highlight {
    color: var(--color-accent);
    position: relative;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-accent);
    opacity: 0.5;
}

.subtitle {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    margin-top: 8px;
}

.form-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

body.tema-claro .form-section {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.form-section:hover {
    border-color: rgba(255, 107, 53, 0.3);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    background: rgba(255, 107, 53, 0.1);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    font-family: var(--font-display);
    font-size: 1rem;
    padding: 14px 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all var(--transition-fast);
    outline: none;
}

body.tema-claro .form-group input,
body.tema-claro .form-group textarea {
    background: var(--color-bg);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-group textarea {
    resize: vertical;
    min-height: 300px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.7;
}

.sumario-info {
    background: rgba(255, 107, 53, 0.05);
    border-left: 3px solid var(--color-accent);
    padding: 16px 20px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.sumario-info p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.sumario-info p:last-child {
    margin-bottom: 0;
}

.sumario-info code {
    font-family: var(--font-mono);
    background: var(--color-bg);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    font-size: 0.85rem;
}

body.tema-claro .sumario-info code {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
}

.options-section {
    background: transparent;
    border: none;
    padding: 0;
}

.options-section:hover {
    border-color: transparent;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.option-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px;
}

body.tema-claro .option-card {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.option-label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.radio-group,
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-option,
.checkbox-option {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.radio-option:hover,
.checkbox-option:hover {
    color: var(--color-accent);
}

.radio-option input,
.checkbox-option input {
    display: none;
}

.radio-custom,
.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-custom {
    border-radius: var(--radius-sm);
}

.radio-custom::after,
.checkbox-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 10px;
    height: 10px;
    background: var(--color-accent);
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.checkbox-custom::after {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") center no-repeat var(--color-accent);
}

.radio-option input:checked ~ .radio-custom,
.checkbox-option input:checked ~ .checkbox-custom {
    border-color: var(--color-accent);
}

.radio-option input:checked ~ .radio-custom::after,
.checkbox-option input:checked ~ .checkbox-custom::after {
    transform: translate(-50%, -50%) scale(1);
}

.radio-text,
.checkbox-text {
    font-size: 0.95rem;
}

.generate-section {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

.btn-generate {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    padding: 18px 40px;
    background: linear-gradient(135deg, var(--color-accent) 0%, #e85a28 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--color-accent-glow);
}

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

.btn-icon {
    display: flex;
    align-items: center;
}

.processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
}

body.tema-claro .processing-overlay {
    background: rgba(245, 245, 247, 0.95);
}

.processing-overlay.active {
    opacity: 1;
    visibility: visible;
}

.processing-content {
    text-align: center;
    max-width: 500px;
    padding: 40px;
}

.processing-animation {
    position: relative;
    width: 200px;
    height: 280px;
    margin: 0 auto 40px;
}

.paper {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 200px;
    background: var(--color-paper);
    border-radius: 4px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    animation: paperFloat 3s ease-in-out infinite;
}

body.tema-claro .paper {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

@keyframes paperFloat {
    0%, 100% { transform: translate(-50%, -50%) rotate(-2deg); }
    50% { transform: translate(-50%, -55%) rotate(2deg); }
}

.paper-lines {
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.paper-lines .line {
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    animation: lineFill 2s ease-in-out infinite;
}

.paper-lines .line:nth-child(1) { animation-delay: 0s; width: 60%; }
.paper-lines .line:nth-child(2) { animation-delay: 0.2s; width: 100%; }
.paper-lines .line:nth-child(3) { animation-delay: 0.4s; width: 85%; }
.paper-lines .line:nth-child(4) { animation-delay: 0.6s; width: 95%; }
.paper-lines .line:nth-child(5) { animation-delay: 0.8s; width: 70%; }

@keyframes lineFill {
    0%, 100% { background: #e0e0e0; }
    50% { background: var(--color-accent); }
}

.formatting-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.format-item {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-accent);
    background: rgba(255, 107, 53, 0.1);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    opacity: 0;
    animation: formatPop 4s ease-in-out infinite;
}

body.tema-claro .format-item {
    background: rgba(232, 90, 40, 0.15);
}

.margin-top { top: 10px; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.margin-left { top: 50%; left: 0; transform: translateY(-50%); animation-delay: 0.5s; }
.margin-right { top: 50%; right: 0; transform: translateY(-50%); animation-delay: 1s; }
.margin-bottom { bottom: 10px; left: 50%; transform: translateX(-50%); animation-delay: 1.5s; }
.font-size { top: 20%; right: 10px; animation-delay: 2s; }
.spacing { bottom: 20%; left: 10px; animation-delay: 2.5s; }

@keyframes formatPop {
    0%, 15%, 100% { opacity: 0; transform: scale(0.8); }
    20%, 40% { opacity: 1; transform: scale(1); }
    45% { opacity: 0; transform: scale(0.8); }
}

.processing-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0.3;
    transition: all var(--transition-normal);
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 0.6;
}

.step.completed .step-indicator {
    background: var(--color-success);
    border-color: var(--color-success);
}

.step.completed .step-indicator::after {
    content: '✓';
    color: var(--color-bg);
    font-size: 0.7rem;
}

body.tema-claro .step.completed .step-indicator::after {
    color: #fff;
}

.step-indicator {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.step.active .step-indicator {
    border-color: var(--color-accent);
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--color-accent-glow); }
    50% { box-shadow: 0 0 0 8px transparent; }
}

.step-text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.step.active .step-text {
    color: var(--color-text);
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-accent), #ffb347);
    border-radius: 2px;
    transition: width 0.3s ease-out;
}

.footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    margin-top: 40px;
}

.footer p {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

@media (max-width: 768px) {
    .container {
        padding: 24px 16px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .form-section {
        padding: 24px 20px;
    }
    
    .processing-animation {
        transform: scale(0.8);
    }
    
    .btn-tema {
        top: 16px;
        right: 16px;
        width: 44px;
        height: 44px;
    }
    
    .tema-icone {
        font-size: 1.25rem;
    }
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}