/**
 * Medidor de Velocidade Site - Styles
 * Desenvolvido por B20 Conteúdo Digital
 * https://www.b20.com.br
 */

/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
    /* Color Palette */
    --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-danger: #ef4444;
    --color-info: #3b82f6;
    
    /* Neutral Colors */
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #f9fafb;
    --color-bg-card: #ffffff;
    --color-border: #e5e7eb;
    
    /* 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;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
    
    /* 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-tooltip: 1050;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
.black-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 30px;
background-color: #000000;
z-index: 1001;
}
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    padding-bottom: 80px;
    min-height: 100vh;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

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); }

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

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);
}

.section {
    display: none;
    padding: var(--spacing-xl) 0;
}

.section.active-section {
    display: block;
}

/* ========================================
   Header
   ======================================== */
.app-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-md);
}

.header-content {
    text-align: center;
}

.app-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
}

.app-logo {
    height: 50px;
    width: auto;
    object-fit: contain;
    transition: transform var(--transition-base);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
    flex-shrink: 0;
}

.app-logo:hover {
    transform: scale(1.05);
}

.app-title-text {
    display: inline-block;
    white-space: nowrap;
}

.app-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin: 0;
}

/* ========================================
   Cards
   ======================================== */
.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.card-header h2 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-body {
    padding: var(--spacing-lg);
}

/* ========================================
   Forms
   ======================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
    font-family: var(--font-family);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-input.error {
    border-color: var(--color-danger);
}

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

.error-message {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
    display: none;
}

.error-message.show {
    display: block;
}

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

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

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

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

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

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

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

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

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

/* ========================================
   Loading State
   ======================================== */
.loading-state {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

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

.loading-text {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.loading-subtext {
    color: var(--color-text-light);
    margin: 0;
}

/* ========================================
   Results
   ======================================== */
.results-container {
    margin-top: var(--spacing-xl);
}

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.tested-url {
    color: var(--color-text-light);
    word-break: break-all;
    margin: 0;
}

.scores-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.score-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
}

.score-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-lg) auto;
    border: 8px solid;
    transition: all var(--transition-base);
}

.score-circle.excellent {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
}

.score-circle.good {
    border-color: var(--color-warning);
    background: rgba(245, 158, 11, 0.1);
}

.score-circle.poor {
    border-color: var(--color-danger);
    background: rgba(239, 68, 68, 0.1);
}

.score-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
}

.score-label {
    font-weight: 600;
    margin: 0;
}

/* ========================================
   Metrics
   ======================================== */
.metrics-section {
    margin-bottom: var(--spacing-xl);
}

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

.metric-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.metric-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: white;
}

.lcp-icon { background: var(--color-info); }
.fid-icon { background: var(--color-accent-1); }
.cls-icon { background: var(--color-accent-2); }

.metric-info h5 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.metric-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.metric-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    margin: 0;
}

/* ========================================
   Suggestions
   ======================================== */
.suggestions-section {
    margin-bottom: var(--spacing-xl);
}

.suggestions-list {
    list-style: none;
}

.suggestions-list li {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.suggestions-list li::before {
    content: '💡';
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

/* ========================================
   History
   ======================================== */
.history-container {
    display: grid;
    gap: var(--spacing-md);
}

.history-item {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.history-url {
    font-weight: 600;
    word-break: break-all;
    flex: 1;
}

.history-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.history-scores {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-sm);
}

.history-score {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.history-score-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.history-score-badge.excellent {
    background: var(--color-success);
    color: white;
}

.history-score-badge.good {
    background: var(--color-warning);
    color: white;
}

.history-score-badge.poor {
    background: var(--color-danger);
    color: white;
}

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

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-subtext {
    font-size: var(--font-size-sm);
}

/* ========================================
   FAQ
   ======================================== */
.faq-section {
    margin-bottom: var(--spacing-2xl);
}

.faq-container {
    display: grid;
    gap: var(--spacing-md);
}

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

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

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

.faq-icon {
    font-size: var(--font-size-xl);
    font-weight: 300;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

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

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-light);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-answer:not([hidden]) {
    max-height: 500px;
}

/* ========================================
   Bottom Navigation
   ======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-bg-card);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-sm) 0;
    z-index: var(--z-fixed);
    margin-bottom: 80px;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
    min-width: 60px;
    min-height: 44px;
    justify-content: center;
}

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

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 600;
}

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

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

/* ========================================
   Footer
   ======================================== */
.app-footer {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-top: var(--spacing-2xl);
    margin-bottom: 60px;
}

.app-footer p {
    margin-bottom: var(--spacing-sm);
}

.app-footer a {
    color: var(--color-accent-3);
}

.b20-link {
    font-weight: 600;
    transition: all var(--transition-fast);
}

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

/* ========================================
   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: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (min-width: 768px) {
    body {
        padding-bottom: 0;
    }
    
    .bottom-nav {
        position: static;
        box-shadow: none;
        border-top: 1px solid var(--color-border);
        margin-top: var(--spacing-2xl);
    }
    
    .metrics-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .app-title {
        font-size: 3rem;
        gap: var(--spacing-md);
    }
    
    .app-logo {
        height: 80px;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
    
    .scores-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-container,
.history-item {
    animation: fadeIn var(--transition-base);
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .bottom-nav,
    .app-footer,
    .btn {
        display: none;
    }
}