/* Reset e Variáveis */
:root {
    --primary-color: #3b82f6;
    --secondary-color: #10b981;
    --dark-bg: #1e293b;
    --card-bg: #334155;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --success-color: #10b981;
    --info-color: #3b82f6;
    --warning-color: #f59e0b;
}

/* Light Mode Variables */
body.light-mode {
    --dark-bg: #f1f5f9;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #cbd5e1;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #0f172a url('../images/c598f7e8-829f-412d-82dd-2bdffd2812c2.png') repeat;
    background-size: 400px 400px;
    color: var(--text-color);
    min-height: 100vh;
    padding: 10px;
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
    overflow-y: auto;
}

/* Light Mode */
body.light-mode {
    background: #e2e8f0 url('../images/c598f7e8-829f-412d-82dd-2bdffd2812c2.png') repeat;
    background-size: 400px 400px;
    filter: brightness(1.2) saturate(0.8);
}

body.light-mode .card {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

body.light-mode .form-group input {
    background: #f8fafc;
}

body.light-mode .result-box {
    background: #f8fafc;
}

body.light-mode .info-box {
    background: rgba(59, 130, 246, 0.05);
}

body.light-mode .result-box .result-item {
    background: rgba(16, 185, 129, 0.05);
}

body.light-mode .result-box .calculation {
    background: rgba(59, 130, 246, 0.05);
}

body.light-mode .result-box .sample-list {
    background: rgba(245, 158, 11, 0.05);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    animation: fadeIn 0.5s ease-in;
}

body.light-mode .container {
    background: rgba(255, 255, 255, 0.5);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

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

/* Header */
header {
    padding: 25px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2563eb 100%);
    border-radius: 15px;
    margin-bottom: 15px;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.header-content > div {
    flex: 1;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    color: white;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
    color: white;
}

/* Theme Toggle Button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(180deg) scale(1.1);
}

.theme-toggle:active {
    transform: rotate(180deg) scale(0.95);
}

.theme-icon {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.tab-button {
    flex: 1;
    min-width: 200px;
    padding: 15px 20px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-button:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.tab-button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

/* Tab Content */
.tab-content {
    display: none;
    animation: slideIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Card */
.card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.card h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.8rem;
}

/* Info Box */
.info-box {
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 15px;
    margin-bottom: 25px;
    border-radius: 8px;
}

.info-box p {
    margin-bottom: 8px;
}

.info-box strong {
    color: var(--primary-color);
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2563eb 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Result Box */
.result-box {
    margin-top: 25px;
    padding: 20px;
    background: var(--dark-bg);
    border-radius: 10px;
    border: 2px solid var(--border-color);
    min-height: 50px;
}

.result-box.show {
    animation: slideDown 0.4s ease;
}

@keyframes slideDown {
    from { 
        opacity: 0; 
        transform: translateY(-10px);
        max-height: 0;
    }
    to { 
        opacity: 1; 
        transform: translateY(0);
        max-height: 1000px;
    }
}

.result-box h3 {
    color: var(--success-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.result-box .result-item {
    padding: 10px;
    margin: 10px 0;
    background: rgba(16, 185, 129, 0.1);
    border-left: 3px solid var(--success-color);
    border-radius: 5px;
}

.result-box .calculation {
    background: rgba(59, 130, 246, 0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    border-left: 3px solid var(--info-color);
}

.result-box .sample-list {
    background: rgba(245, 158, 11, 0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    border-left: 3px solid var(--warning-color);
    word-wrap: break-word;
}

.result-box strong {
    color: var(--primary-color);
}

.result-box .highlight {
    color: var(--success-color);
    font-weight: bold;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 15px;
    padding: 12px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

body.light-mode footer {
    background: rgba(255, 255, 255, 0.5);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .header-content {
        flex-direction: column;
    }
    
    .header-content > div {
        text-align: center;
    }
    
    .theme-toggle {
        position: absolute;
        top: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-button {
        min-width: 100%;
    }
    
    .card {
        padding: 20px;
    }
    
    .container {
        padding: 10px;
    }
}

/* Loading Animation */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state::before {
    content: "📊";
    display: block;
    font-size: 4rem;
    margin-bottom: 20px;
}