/* ==========================================================================
   AcertoFácil - Calculadora de Acertos
   Stylesheet with modern gradient design and responsive layout
   ========================================================================== */

/* CSS Variables for Color Palette */
:root {
    --primary-color: #1A535C;
    --secondary-color: #4ECDC4;
    --light-color: #F7FFF7;
    --accent-color: #FF6B6B;
    --warning-color: #FFE66D;
    
    /* Gradient Variables */
    --header-gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --card-gradient: linear-gradient(145deg, var(--light-color) 0%, rgba(78, 205, 196, 0.1) 100%);
    --footer-gradient: linear-gradient(135deg, var(--primary-color) 0%, #0f3c42 100%);
    --button-gradient: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    
    /* Performance Colors */
    --excellent-color: #28a745;
    --good-color: #17a2b8;
    --regular-color: var(--warning-color);
    --weak-color: var(--accent-color);
    
    /* Shadows */
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--light-color) 0%, rgba(78, 205, 196, 0.05) 100%);
    color: var(--primary-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header Styles */
.header-gradient {
    background: var(--header-gradient);
    position: relative;
    overflow: hidden;
}

.header-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="60" cy="40" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="70" r="2.5" fill="rgba(255,255,255,0.1)"/></svg>');
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-20px) rotate(360deg); }
}

.text-white-75 {
    color: rgba(255, 255, 255, 0.75) !important;
}

/* Card Styles */
.card {
    border-radius: 20px;
    transition: all var(--transition-medium);
    backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.card-gradient {
    background: var(--card-gradient);
    border: 1px solid rgba(78, 205, 196, 0.2);
}

.card-header {
    border-radius: 20px 20px 0 0 !important;
}

/* Form Styles */
.form-control {
    border-radius: 12px;
    border: 2px solid rgba(26, 83, 92, 0.1);
    padding: 12px 16px;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(5px);
}

.form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(78, 205, 196, 0.25);
    background: rgba(255, 255, 255, 0.95);
}

.form-control.is-invalid {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(255, 107, 107, 0.25);
}

.form-label {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.form-text {
    color: rgba(26, 83, 92, 0.6);
    font-size: 0.85rem;
}

/* Button Styles */
.btn {
    border-radius: 12px;
    font-weight: 600;
    padding: 12px 24px;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-medium);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--button-gradient);
    border: none;
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-outline-secondary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-outline-primary {
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-outline-success {
    border: 2px solid var(--excellent-color);
    color: var(--excellent-color);
    background: transparent;
}

.btn-outline-success:hover {
    background: var(--excellent-color);
    color: white;
    transform: translateY(-2px);
}

/* Results Styles */
#resultsCard {
    animation: slideInUp var(--transition-slow) ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Percentage Circle */
.percentage-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: conic-gradient(var(--secondary-color) 0deg, var(--light-color) 0deg);
    transition: all var(--transition-slow);
}

.percentage-circle::before {
    content: '';
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: white;
    box-shadow: inset var(--shadow-light);
}

.percentage-text {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    z-index: 1;
    position: relative;
}

/* Performance Colors */
.percentage-circle.excellent {
    background: conic-gradient(var(--excellent-color) var(--percentage, 0deg), var(--light-color) var(--percentage, 0deg));
}

.percentage-circle.good {
    background: conic-gradient(var(--good-color) var(--percentage, 0deg), var(--light-color) var(--percentage, 0deg));
}

.percentage-circle.regular {
    background: conic-gradient(var(--warning-color) var(--percentage, 0deg), var(--light-color) var(--percentage, 0deg));
}

.percentage-circle.weak {
    background: conic-gradient(var(--accent-color) var(--percentage, 0deg), var(--light-color) var(--percentage, 0deg));
}

/* Progress Bar */
.progress {
    height: 12px;
    border-radius: 10px;
    background: rgba(26, 83, 92, 0.1);
    overflow: hidden;
}

.progress-lg {
    height: 16px;
}

.progress-bar {
    border-radius: 10px;
    transition: width var(--transition-slow) ease;
}

/* Statistics */
.stat-item {
    padding: 20px 10px;
    text-align: center;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(5px);
    transition: all var(--transition-fast);
    border: 1px solid rgba(78, 205, 196, 0.1);
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-light);
    background: rgba(255, 255, 255, 0.8);
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.stat-number {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(26, 83, 92, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Tips Card */
.tips-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(78, 205, 196, 0.05) 100%);
    border: 1px solid rgba(78, 205, 196, 0.2);
}

.tip-item {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    border-left: 4px solid;
}

.tip-item.excellent {
    background: rgba(40, 167, 69, 0.1);
    border-left-color: var(--excellent-color);
    color: var(--excellent-color);
}

.tip-item.good {
    background: rgba(23, 162, 184, 0.1);
    border-left-color: var(--good-color);
    color: var(--good-color);
}

.tip-item.regular {
    background: rgba(255, 230, 109, 0.1);
    border-left-color: var(--warning-color);
    color: #856404;
}

.tip-item.weak {
    background: rgba(255, 107, 107, 0.1);
    border-left-color: var(--accent-color);
    color: var(--accent-color);
}

.tip-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-light);
}

/* Footer */
.footer-gradient {
    background: var(--footer-gradient);
    position: relative;
}

.footer-gradient a:hover {
    text-decoration: underline !important;
    opacity: 0.8;
}

/* Toast Styles */
.toast {
    border-radius: 12px;
    border: none;
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(10px);
}

/* Loading Animation */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(78, 205, 196, 0.3), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .card {
        margin-bottom: 20px;
    }
    
    .percentage-circle {
        width: 120px;
        height: 120px;
    }
    
    .percentage-circle::before {
        width: 95px;
        height: 95px;
    }
    
    .percentage-text {
        font-size: 1.5rem;
    }
    
    .stat-item {
        padding: 15px 8px;
        margin-bottom: 10px;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .tip-item {
        font-size: 0.85rem;
        padding: 10px 12px;
    }
}

@media (max-width: 576px) {
    .header-gradient {
        padding: 2rem 0 !important;
    }
    
    .display-4 {
        font-size: 1.8rem;
    }
    
    .card-body {
        padding: 1.5rem !important;
    }
    
    .percentage-circle {
        width: 100px;
        height: 100px;
    }
    
    .percentage-circle::before {
        width: 80px;
        height: 80px;
    }
    
    .percentage-text {
        font-size: 1.3rem;
    }
    
    .d-grid .btn {
        margin-bottom: 10px;
    }
    
    .stat-item {
        padding: 12px 6px;
    }
    
    .stat-number {
        font-size: 1.3rem;
    }
    
    .stat-icon {
        font-size: 1.2rem;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Better Accessibility */
.btn:focus,
.form-control:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --secondary-color: #0066cc;
        --light-color: #ffffff;
        --accent-color: #cc0000;
        --warning-color: #cc6600;
    }
}

/* Print Styles */
@media print {
    .header-gradient,
    .footer-gradient,
    .btn,
    .tips-card {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #000 !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}