/**
 * Calculadora de Engajamento - Styles
 * Desenvolvido por B20 Conteúdo Digital
 * https://www.b20.com.br
 */

/* ========================================
   CSS CUSTOM PROPERTIES
   ======================================== */
:root {
    /* Color Palette - Instagram Gradient Inspired */
    --color-primary: #833AB4;
    --color-secondary: #FD1D1D;
    --color-accent-1: #F77737;
    --color-accent-2: #FCAF45;
    --color-accent-3: #FFDC80;
    
    /* Semantic Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    
    /* Neutral Colors */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F9FAFB;
    --color-bg-tertiary: #F3F4F6;
    --color-text-primary: #111827;
    --color-text-secondary: #6B7280;
    --color-text-tertiary: #9CA3AF;
    --color-border: #E5E7EB;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow);
    --shadow-xl: 0 20px 25px -5px var(--color-shadow);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
    
    /* Bottom Nav Height */
    --bottom-nav-height: 64px;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    padding-top: 80px;
    padding-bottom: calc(var(--bottom-nav-height) + var(--spacing-lg));
    min-height: 100vh;
    margin: 0 auto;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary);
}

/* ========================================
   LAYOUT
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    box-sizing: border-box;
}

.section {
    display: none;
    padding: var(--spacing-xl) 0;
    animation: fadeIn var(--transition-base);
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

.black-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 30px;
    background-color: #000000;
    z-index: 1001;
    width: 100%;
    max-width: 100vw;
}

.section.active {
    display: block;
}

.section-title {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   HEADER
   ======================================== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-accent-1));
    color: white;
    padding: var(--spacing-md) 0;
    text-align: left;
    box-shadow: var(--shadow-md);
    width: 100%;
    overflow: hidden;
}

.app-header__content {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-md);
    flex-wrap: nowrap;
    width: 100%;
    max-width: 100%;
}

.app-header__logo {
    width: clamp(60px, 12vw, 90px);
    height: auto;
    flex: 0 0 auto;
    object-fit: contain;
}

.app-header__text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-start;
    text-align: left;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
}

.app-header h1 {
    color: white;
    margin: 0 0 var(--spacing-xs) 0;
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.subtitle {
    font-size: clamp(0.875rem, 2.5vw, 1rem);
    opacity: 0.95;
    margin: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

@media (max-width: 640px) {
    .app-header {
        padding: var(--spacing-sm) 0;
    }
    .app-header__content {
        gap: var(--spacing-sm);
    }
    .app-header__logo {
        width: clamp(50px, 16vw, 70px);
    }
    .app-header__text {
        flex: 1;
    }
}

/* ========================================
   FORMS
   ======================================== */
.calculator-form {
    background: var(--color-bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.form-label i {
    margin-right: var(--spacing-xs);
    color: var(--color-primary);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: all var(--transition-fast);
    background-color: var(--color-bg-primary);
    box-sizing: border-box;
    max-width: 100%;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(131, 58, 180, 0.1);
}

.form-control:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
}

.form-control:valid:not(:placeholder-shown) {
    border-color: var(--color-success);
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.error-message {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--color-error);
    font-weight: 500;
}

.metrics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-height: 44px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-border);
}

.btn-large {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ========================================
   RESULTS
   ======================================== */
.results-container {
    animation: slideUp var(--transition-base);
    margin-top: var(--spacing-2xl);
}

.result-card {
    background: var(--color-bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.platform-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.engagement-score {
    display: flex;
    justify-content: center;
    margin: var(--spacing-2xl) 0;
}

.score-circle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    box-shadow: var(--shadow-xl);
    position: relative;
}

.score-circle::before {
    content: '';
    position: absolute;
    inset: 8px;
    border-radius: 50%;
    background: var(--color-bg-primary);
}

.score-value {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-label {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

.result-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.detail-label {
    font-weight: 600;
    color: var(--color-text-secondary);
}

.detail-value {
    font-weight: 700;
    color: var(--color-text-primary);
}

.quality-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: white;
}

.quality-badge.excellent {
    background: var(--color-success);
}

.quality-badge.good {
    background: var(--color-info);
}

.quality-badge.average {
    background: var(--color-warning);
}

.quality-badge.poor {
    background: var(--color-error);
}

.suggestions {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-accent-2);
}

.suggestions h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.suggestions ul {
    list-style: none;
    padding: 0;
}

.suggestions li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.suggestions li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 700;
}

/* ========================================
   HISTORY
   ======================================== */
.history-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: var(--spacing-lg);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-tertiary);
}

.empty-state i {
    color: var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.empty-state-hint {
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}


.history-list {
    display: grid;
    gap: var(--spacing-md);
}

.history-item {
    background: var(--color-bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
}

.history-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.history-info {
    flex: 1;
}

.history-platform {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.history-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.history-score {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   FAQ
   ======================================== */
.faq-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 44px;
}

.faq-question:hover {
    background: var(--color-bg-secondary);
}

.faq-question[aria-expanded="true"] {
    background: var(--color-bg-secondary);
}

.faq-icon {
    transition: transform var(--transition-fast);
    color: var(--color-primary);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-secondary);
    animation: slideDown var(--transition-base);
}

.faq-answer p {
    margin-bottom: var(--spacing-md);
}

.faq-answer ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.faq-answer li {
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   BOTTOM NAVIGATION
   ======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: var(--z-fixed);
    box-shadow: 0 -2px 10px var(--color-shadow);
    width: 100%;
    margin-bottom: 80px;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: all var(--transition-fast);
    flex: 1;
    min-height: 44px;
}

.nav-item i {
    font-size: var(--font-size-xl);
}

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-primary);
}

.nav-item.active {
    background: linear-gradient(to top, rgba(131, 58, 180, 0.1), transparent);
}

/* ========================================
   FOOTER
   ======================================== */
.app-footer {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);

}

.app-footer p {
    margin: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.b20-link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.b20-link:hover {
    text-decoration: underline;
    transform: scale(1.05);
    display: inline-block;
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 500px;
    }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablets (768px+) */
@media (min-width: 768px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .result-header {
        flex-wrap: nowrap;
    }
    
    .history-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .metrics-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .score-circle {
        width: 250px;
        height: 250px;
    }
    
    .score-value {
        font-size: 3.5rem;
    }
    
    .history-list {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .bottom-nav,
    .app-footer,
    .btn {
        display: none;
    }
    
    .section {
        display: block;
    }
    
    body {
        padding-bottom: 0;
    }
}