/* Material Design - Mobile First */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #1976d2;
    --primary-dark: #1565c0;
    --background: #fafafa;
    --surface: #fff;
    --text-primary: rgba(0,0,0,0.87);
    --text-secondary: rgba(0,0,0,0.54);
    --divider: rgba(0,0,0,0.12);
    --shadow-2: 0 4px 8px rgba(0,0,0,0.12);
    --shadow-4: 0 8px 16px rgba(0,0,0,0.15);
}

body { font-family: Roboto, sans-serif; background: var(--background); color: var(--text-primary); }

.container { max-width: 100%; padding: 16px; margin: 0 auto; }
@media (min-width: 768px) { .container { padding: 24px; max-width: 960px; } }
@media (min-width: 1200px) { .container { max-width: 1200px; padding: 32px; } }

header { background: var(--primary); color: white; padding: 64px 16px 24px; margin: -16px -16px 24px; box-shadow: var(--shadow-4); text-align: center; }
header h1 { font-size: 1.75rem; margin-bottom: 8px; }
header p { font-size: 0.875rem; opacity: 0.9; }
@media (min-width: 768px) { header { padding: 80px 24px 32px; margin: -24px -24px 32px; } header h1 { font-size: 2.5rem; } }

.search-box { background: var(--surface); border-radius: 28px; padding: 8px 16px; margin: 0 auto 24px; max-width: 600px; display: flex; align-items: center; box-shadow: var(--shadow-2); }
.search-box input { flex: 1; border: none; outline: none; padding: 12px 8px; font-size: 1rem; background: transparent; }
.search-icon { color: var(--text-secondary); margin-right: 8px; }

.categories { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 768px) { .categories { grid-template-columns: repeat(2, 1fr); gap: 24px; } }
@media (min-width: 1200px) { .categories { grid-template-columns: repeat(3, 1fr); } }

.category { background: var(--surface); padding: 16px; border-radius: 8px; box-shadow: var(--shadow-2); }
.category h2 { color: var(--primary); margin-bottom: 16px; font-size: 1.25rem; }

.category-list { list-style: none; }
.category-list li { border-bottom: 1px solid var(--divider); }
.category-list li:last-child { border-bottom: none; }
.category-list a { color: var(--text-primary); text-decoration: none; display: flex; padding: 12px 8px; min-height: 48px; align-items: center; }
.category-list a:hover { background: rgba(0,0,0,0.04); }

.calculator-card { background: var(--surface); padding: 16px; border-radius: 8px; box-shadow: var(--shadow-2); margin: 0 auto 16px; }
.calculator-card h2 { color: var(--primary); margin-bottom: 24px; font-size: 1.5rem; text-align: center; }
@media (min-width: 768px) { .calculator-card { padding: 24px; max-width: 600px; margin: 24px auto; } }

.form-group { margin-bottom: 24px; position: relative; }
.form-group label { display: block; margin-bottom: 8px; color: var(--text-secondary); font-size: 0.875rem; font-weight: 500; letter-spacing: 0.5px; transition: color 0.2s; }
.form-group input, .form-group select, .form-group textarea { 
    width: 100%; 
    padding: 14px 16px; 
    border: 2px solid var(--divider); 
    border-radius: 8px; 
    font-size: 1rem; 
    font-family: Roboto, sans-serif;
    background: var(--surface);
    color: var(--text-primary) !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.form-group input:hover, .form-group select:hover, .form-group textarea:hover { 
    border-color: rgba(25,118,210,0.4);
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { 
    outline: none; 
    border-color: var(--primary); 
    box-shadow: 0 0 0 3px rgba(25,118,210,0.12), 0 2px 8px rgba(0,0,0,0.1);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-secondary); opacity: 0.6; }
.form-group select { cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='%23666'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 8px center; padding-right: 40px; }
.form-group textarea { min-height: 100px; resize: vertical; }

.input-row { display: grid; grid-template-columns: 1fr; gap: 16px; margin-bottom: 8px; }
@media (min-width: 768px) { .input-row { grid-template-columns: repeat(2, 1fr); gap: 20px; } }

/* input-group é um alias para form-group */
.input-group { margin-bottom: 24px; position: relative; }
.input-group label { display: block; margin-bottom: 8px; color: var(--text-secondary); font-size: 0.875rem; font-weight: 500; letter-spacing: 0.5px; transition: color 0.2s; }
.input-group input, .input-group select, .input-group textarea { 
    width: 100%; 
    padding: 14px 16px; 
    border: 2px solid var(--divider); 
    border-radius: 8px; 
    font-size: 1rem; 
    font-family: Roboto, sans-serif;
    background: var(--surface);
    color: var(--text-primary) !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.input-group input:hover, .input-group select:hover, .input-group textarea:hover { 
    border-color: rgba(25,118,210,0.4);
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.input-group input:focus, .input-group select:focus, .input-group textarea:focus { 
    outline: none; 
    border-color: var(--primary); 
    box-shadow: 0 0 0 3px rgba(25,118,210,0.12), 0 2px 8px rgba(0,0,0,0.1);
}
.input-group input::placeholder, .input-group textarea::placeholder { color: var(--text-secondary); opacity: 0.6; }
.input-group input[disabled], .input-group select[disabled] { 
    background: var(--background); 
    cursor: not-allowed; 
    opacity: 0.6;
}
.input-row .input-group { margin-bottom: 0; }

.btn { 
    background: var(--primary); 
    color: white; 
    padding: 14px 32px; 
    border: none; 
    border-radius: 8px; 
    font-size: 0.9375rem; 
    font-weight: 500; 
    text-transform: uppercase; 
    letter-spacing: 1px;
    cursor: pointer; 
    width: 100%; 
    margin-top: 16px; 
    box-shadow: var(--shadow-2); 
    min-height: 48px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: Roboto, sans-serif;
    position: relative;
    overflow: hidden;
}
.btn:hover { 
    background: var(--primary-dark); 
    box-shadow: var(--shadow-4);
    transform: translateY(-2px);
}
.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-2);
}

.back-button { display: inline-flex; padding: 8px 16px; color: var(--primary); text-decoration: none; border-radius: 4px; margin-bottom: 16px; font-weight: 500; }
.back-button:hover { background: rgba(25,118,210,0.04); }

.result { margin-top: 24px; padding: 16px; background: var(--surface); border-radius: 4px; border-left: 4px solid var(--primary); box-shadow: 0 2px 4px rgba(0,0,0,0.1); display: none; }
.result.show { display: block; }
.result h3 { color: var(--primary); margin-bottom: 16px; font-size: 1.125rem; }
.result p { margin: 12px 0; }
.result-value { color: var(--primary); font-weight: 700; font-size: 1.5rem; }

footer { text-align: center; padding: 24px 16px; color: var(--text-secondary); margin-top: 48px; border-top: 1px solid var(--divider); }

.hidden { display: none !important; }
.empty-state { text-align: center; padding: 48px 16px; color: var(--text-secondary); }
input[type="checkbox"], input[type="radio"] { 
    width: auto; 
    margin-right: 12px; 
    cursor: pointer;
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}
label.inline-label {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}
.radio-group, .checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.radio-group label, .checkbox-group label {
    display: inline-flex;
    align-items: center;
    font-size: 1rem;
    color: var(--text-primary);
    text-transform: none;
    font-weight: 400;
}