:root {
    /* Brand Colors */
    --primary: #4F46E5;
    --primary-hover: #4338ca;
    --secondary: #10B981;
    --secondary-hover: #059669;
    --dark: #0F172A;
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;

    /* Text */
    --text-main: #1E293B;
    --text-muted: #64748B;
    --border-color: #E2E8F0;

    /* UI Constants */
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.15);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
    /* Soft gradient background */
    background: linear-gradient(135deg, #F8FAFC 0%, #EEF2FF 100%);
}

.app-container {
    background: var(--card-bg);
    width: 100%;
    max-width: 800px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Header & Progress */
.header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: #fff;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--primary);
}

.progress-container {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #818CF8);
    width: 0%;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-indicator {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Main Content */
.main-content {
    padding: 40px 32px;
    position: relative;
    min-height: 480px;
}

/* Steps */
.form-step {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.form-step.active {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.step-header {
    margin-bottom: 32px;
}

.step-header h2 {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.3;
}

.step-header p {
    color: var(--text-muted);
}

/* Inputs */
.input-group {
    margin-bottom: 20px;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.95rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.2s;
    background: #F8FAFC;
    resize: vertical;
    /* only for textarea, ignored by inputs */
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Options Grid (Radios & Checkboxes) */
.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media (min-width: 600px) {
    .options-grid {
        /* Se houver muitas opções curtas, poderia ser 1fr 1fr, mas bloco inteiro funciona melhor para mobile/desktop leitura rápida */
    }
}

.option-card {
    display: block;
    position: relative;
    cursor: pointer;
}

/* Hide default radio/checkbox */
.option-card input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.card-content {
    display: block;
    padding: 16px 20px;
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-weight: 500;
    color: var(--text-main);
    transition: all 0.2s ease;
}

.option-card:hover .card-content {
    border-color: #cbd5e1;
    background: #F8FAFC;
}

/* Selected state styling */
.option-card input:checked~.card-content {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
    color: var(--primary);
}

.option-card input:focus-visible~.card-content {
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.3);
}

/* Multiselect specific */
.multiselect .option-card input:checked~.card-content {
    border-color: var(--secondary);
    background: rgba(16, 185, 129, 0.05);
    color: var(--secondary-hover);
}

/* Navigation Buttons */
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 16px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: #F1F5F9;
    color: var(--text-main);
}

.btn-secondary:hover {
    background: #E2E8F0;
}

.btn-success {
    background: var(--secondary);
    color: white;
}

.btn-success:hover {
    background: var(--secondary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Error states */
.input-error {
    border-color: #EF4444 !important;
}

/* Loading State */
.processing-state {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(79, 70, 229, 0.2);
    border-left-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 24px;
}

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

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

/* Results Screen */
.results-header {
    text-align: center;
    margin-bottom: 40px;
}

.results-header h2 {
    color: var(--secondary);
    font-size: 2rem;
    margin-bottom: 8px;
}

.recommendations-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.rank-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.rank-card.rank-1 {
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.rank-badge {
    position: absolute;
    top: -14px;
    left: 24px;
    background: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.875rem;
}

.rank-card.rank-1 .rank-badge {
    background: linear-gradient(90deg, #F59E0B, #D97706);
    /* Gold for 1st */
}

/* Helper class */
.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Button Demo Animations */
.btn-demo,
.btn-demo-section {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-demo.loading,
.btn-demo-section.loading {
    background-color: #64748B !important;
    color: transparent !important;
    pointer-events: none;
}

.btn-demo.loading::after,
.btn-demo-section.loading::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-top: -10px;
    margin-left: -10px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-demo.success,
.btn-demo-section.success {
    background-color: var(--secondary) !important;
    color: white !important;
    pointer-events: none;
    padding-left: 40px;
    /* space for checkmark */
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
}

.btn-demo.success::before,
.btn-demo-section.success::before {
    content: "✓";
    position: absolute;
    left: 16px;
    font-weight: bold;
    font-size: 1.1rem;
    animation: bounceIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.2);
        opacity: 1;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Responsive / Mobile Optimization */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .header {
        padding: 16px 20px;
    }

    .logo {
        font-size: 1.25rem;
    }

    .main-content {
        padding: 24px 20px;
    }

    .step-header h2 {
        font-size: 1.3rem;
    }
    
    .step-header p {
        font-size: 0.9rem;
    }

    .input-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .form-actions {
        flex-direction: column-reverse;
        gap: 12px;
    }

    .form-actions .btn {
        width: 100%;
        margin: 0;
    }
    
    .results-header h2 {
        font-size: 1.5rem;
    }
    
    .btn-demo,
    .btn-demo-section {
        width: 100%;
        margin-bottom: 10px;
    }
}