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

:root {
    /* Colors - Tema Azul Petróleo #193a48 */
    --primary: #193a48;
    --primary-dark: #0f2630;
    --primary-light: #2d5a6e;
    --secondary: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* 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), 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-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, #193a48 0%, #0f2630 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   HEADER
   =================================== */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.logo-img {
    height: 80px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 600;
    margin-top: -2px;
    font-style: italic;
}

.tagline {
    font-size: 0.95rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Instagram Link */
.instagram-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 24px;
    background: linear-gradient(135deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    margin: 15px 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(188, 24, 136, 0.4);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.instagram-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(188, 24, 136, 0.5);
    background: linear-gradient(135deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

.instagram-link:active {
    transform: translateY(-1px);
}

.instagram-link i {
    font-size: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

.instagram-link span {
    font-weight: 700;
    letter-spacing: 0.5px;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* ===================================
   MAIN CONTENT
   =================================== */
.main-content {
    padding: var(--spacing-2xl) 0;
}

/* ===================================
   INTRO SECTION
   =================================== */
.intro-section {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.95);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.intro-section h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.intro-section p {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
}

/* ===================================
   CALCULATOR SECTION
   =================================== */
.calculator-section {
    display: grid;
    gap: var(--spacing-xl);
}

.calculator-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.card-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.card-header i {
    font-size: 1.5rem;
}

.card-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

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

/* ===================================
   INPUT GROUPS
   =================================== */
.input-group {
    margin-bottom: var(--spacing-xl);
}

.input-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.input-group label i {
    color: var(--primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    padding-left: 3rem;
    font-size: 1.125rem;
    font-weight: 600;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.currency,
.percent {
    position: absolute;
    left: var(--spacing-lg);
    font-weight: 600;
    color: var(--gray-500);
    font-size: 1.125rem;
    pointer-events: none;
}

.percent {
    left: auto;
    right: var(--spacing-lg);
}

.input-wrapper input:nth-child(2) {
    padding-right: 3rem;
}

.input-hint {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-600);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary);
}

.input-hint i {
    color: var(--primary);
    flex-shrink: 0;
}

/* ===================================
   QUICK BUTTONS
   =================================== */
.quick-buttons {
    margin-bottom: var(--spacing-xl);
}

.quick-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.button-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    gap: var(--spacing-sm);
}

.tax-button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--gray-700);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.tax-button:hover {
    background: var(--gray-200);
    transform: translateY(-2px);
}

.tax-button.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===================================
   ROUNDING OPTIONS
   =================================== */
.rounding-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
}

.radio-option:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

.radio-option input[type="radio"] {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
    accent-color: var(--primary);
}

.radio-option span {
    font-weight: 500;
    color: var(--gray-700);
}

/* ===================================
   RESULTS SECTION
   =================================== */
.results-section {
    display: grid;
    gap: var(--spacing-lg);
}

.result-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: transform 0.3s ease;
}

.result-card:hover {
    transform: translateY(-5px);
}

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

.result-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.result-icon.small {
    width: 60px;
    height: 60px;
    background: var(--gray-100);
    color: var(--primary);
    font-size: 1.5rem;
}

.result-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.result-content {
    flex: 1;
}

.result-label {
    font-size: 0.95rem;
    font-weight: 600;
    opacity: 0.9;
    margin-bottom: var(--spacing-xs);
}

.main-result .result-label {
    color: rgba(255, 255, 255, 0.95);
}

.result-card:not(.main-result) .result-label {
    color: var(--gray-600);
}

.result-value {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-xs);
}

.result-value.small {
    font-size: 1.875rem;
}

.result-card:not(.main-result) .result-value {
    color: var(--gray-900);
}

.result-card:not(.main-result) .result-value.success {
    color: var(--success);
}

.result-hint {
    font-size: 0.875rem;
    opacity: 0.85;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* ===================================
   ANALYSIS SECTION
   =================================== */
.analysis-section {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
}

.analysis-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--gray-100);
}

.analysis-header i {
    font-size: 1.5rem;
    color: var(--primary);
}

.analysis-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.analysis-card {
    background: var(--gray-50);
    border: 2px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    transition: all 0.3s ease;
}

.analysis-card:hover {
    background: white;
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.analysis-icon {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.analysis-content {
    flex: 1;
}

.analysis-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
}

.analysis-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.analysis-percent {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--success);
}

.analysis-desc {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ===================================
   INFO SECTION
   =================================== */
.info-section {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.info-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
}

.info-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.info-content h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.info-content p {
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

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

.formula {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary);
    font-family: 'Courier New', monospace;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
    text-align: center;
}

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

.footer-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .logo-img {
        height: 60px;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .logo-subtitle {
        font-size: 0.75rem;
    }
    
    .tagline {
        font-size: 0.875rem;
    }
    
    .instagram-link {
        font-size: 0.95rem;
        padding: 10px 20px;
    }
    
    .instagram-link i {
        font-size: 1.2rem;
    }
    
    .intro-section h2 {
        font-size: 1.5rem;
    }
    
    .intro-section p {
        font-size: 1rem;
    }
    
    .card-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .card-header h3 {
        font-size: 1.25rem;
    }
    
    .card-body {
        padding: var(--spacing-lg);
    }
    
    .result-card {
        flex-direction: column;
        text-align: center;
    }
    
    .result-icon {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }
    
    .result-icon.small {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .result-value {
        font-size: 2rem;
    }
    
    .result-value.small {
        font-size: 1.5rem;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
    
    .analysis-grid {
        grid-template-columns: 1fr;
    }
    
    .info-card {
        flex-direction: column;
        text-align: center;
    }
    
    .button-group {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-lg) 0;
    }
    
    .intro-section {
        padding: var(--spacing-lg);
    }
    
    .logo-img {
        height: 50px;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .logo-subtitle {
        font-size: 0.7rem;
    }
    
    .result-value {
        font-size: 1.75rem;
    }
    
    .button-group {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calculator-card,
.results-section,
.analysis-section,
.info-card {
    animation: fadeIn 0.6s ease-out;
}