:root {
    --color-primary: #0057FF;
    --color-primary-dark: #0045CC;
    --color-background: #F8F9FC;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A202C;
    --color-text-secondary: #4A5568;
    --color-border: #E2E8F0;
    --border-radius: 12px;
    --shadow-sm: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.07), 0 4px 6px -4px rgb(0 0 0 / 0.07);
    --font-family: 'Inter', sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-text-secondary);
    line-height: 1.6;
}
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: clamp(1rem, 5vw, 2.5rem);
}
header { text-align: center; margin-bottom: 3rem; }
.logo { max-width: 170px; margin-bottom: 1.5rem; }
header h1 {
    color: var(--color-text-primary);
    font-weight: 700;
    font-size: clamp(2rem, 5vw, 2.75rem);
    margin-bottom: 0.75rem;
}
header p { font-size: 1.125rem; max-width: 650px; margin: 0 auto; }
.config-section {
    background-color: var(--color-surface);
    padding: clamp(1.5rem, 5vw, 2rem);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}
.config-section h2 {
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 1rem;
}
.quote-generator {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(320px, 1fr);
    gap: 2.5rem;
    align-items: flex-start;
}
.main-content { display: flex; flex-direction: column; gap: 2rem; }
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-primary);
}
.form-group select, .form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-family);
    font-size: 1rem;
    background-color: var(--color-background);
    transition: all 0.2s ease-in-out;
}
.form-group select:focus, .form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 87, 255, 0.2);
}
#modules-container { display: flex; flex-direction: column; gap: 1rem; }
.module-item {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    transition: all 0.2s ease-in-out;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.module-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.module-item.suggested { border-left: 4px solid var(--color-primary); background-color: #F8FAFF; }
.module-item input[type="checkbox"] { display: none; }
.module-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    position: relative;
    padding-left: 2.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.billing-cycle {
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--color-border);
    color: var(--color-text-secondary);
    padding: 0.25rem 0.6rem;
    border-radius: 99px;
}
.module-title::before {
    content: ''; position: absolute; left: 0; top: 50%;
    transform: translateY(-50%); width: 22px; height: 22px;
    border: 2px solid var(--color-border); border-radius: 6px;
    background-color: var(--color-surface);
    transition: all 0.2s ease-in-out;
}
.module-title::after {
    content: '✔'; position: absolute; left: 5px; top: 50%;
    transform: translateY(-50%) scale(0); font-size: 16px;
    color: var(--color-surface); transition: all 0.2s ease-in-out;
}
.module-item input[type="checkbox"]:checked + .module-title::before {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}
.module-item input[type="checkbox"]:checked + .module-title::after { transform: translateY(-50%) scale(1); }
.module-description {
    font-size: 0.9rem; margin-top: 0.5rem; padding-left: 2.25rem; max-height: 0;
    overflow: hidden; opacity: 0;
    transition: all 0.4s ease-in-out;
}
.timeline { font-weight: 600; color: var(--color-text-primary); display: block; margin-top: 0.5rem; }
.module-item input[type="checkbox"]:checked ~ .module-description { max-height: 150px; opacity: 1; margin-top: 0.75rem; }
.quote-summary .summary-sticky {
    position: sticky; top: 2rem; background-color: var(--color-surface);
    border-radius: var(--border-radius); box-shadow: var(--shadow-md);
    padding: 1.75rem;
}
.summary-sticky h3 {
    text-align: center; color: var(--color-text-primary);
    font-size: 1.5rem; margin-bottom: 1.5rem;
}
#selected-modules-list { min-height: 50px; }
.empty-state { text-align: center; color: #999; padding: 1rem 0; font-style: italic; }
.summary-item { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.95rem; margin-bottom: 0.75rem; animation: fadeIn 0.5s ease; }
.summary-item .name { flex-grow: 1; }
.summary-item .price { font-weight: 600; white-space: nowrap; }
.price-breakdown { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--color-border); }
.price-item { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.price-item span { font-weight: 500; font-size: 1rem; }
.price-item strong { font-size: 1.75rem; font-weight: 700; color: var(--color-primary); }
.total-timeline { margin-top: 1rem; padding: 0.75rem; background-color: var(--color-background); border-radius: 8px; display: flex; justify-content: space-between; align-items: center; }
.total-timeline span { font-size: 0.9rem; font-weight: 500; }
.total-timeline strong { font-weight: 600; color: var(--color-primary); }
.cta-section { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border); }
.cta-section h4 { text-align: center; color: var(--color-text-primary); margin-bottom: 1rem; font-size: 1.1rem; }
.cta-button {
    width: 100%; display: flex; align-items: center; justify-content: center;
    gap: 0.75rem; padding: 0.875rem; border-radius: 8px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
    transition: all 0.2s ease-in-out; text-decoration: none; margin-bottom: 0.75rem;
    border: 1px solid transparent;
}
.cta-button:disabled { background-color: #E2E8F0 !important; border-color: #E2E8F0 !important; color: #A0AEC0 !important; cursor: not-allowed; transform: none !important; }
.cta-button.primary { background: linear-gradient(to right, var(--color-primary), var(--color-primary-dark)); color: var(--color-surface); }
.cta-button.primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.cta-button.secondary { background-color: var(--color-surface); color: var(--color-primary); border-color: var(--color-primary); }
.cta-button.secondary:hover:not(:disabled) { background-color: #F0F5FF; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 1024px) {
    .quote-generator { grid-template-columns: 1fr; }
    .quote-summary .summary-sticky { position: static; margin-top: 2rem; }
}