/* ============================================================
   SHARED STYLES FOR TOOLS - lstu.vn
   ============================================================ */

:root {
    --clr-primary: #1BAB9A;
    --clr-primary-dark: #15887A;
    --clr-bg: #F8FAFA;
    --clr-white: #FFFFFF;
    --clr-text: #2D2D2D;
    --clr-text-light: #666666;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --radius: 16px;
    --radius-full: 50px;
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--clr-bg);
    color: var(--clr-text);
    line-height: 1.6;
    padding: 2rem 1rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .container {
        max-width: 50%;
    }
}

/* --- Header Section --- */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--clr-primary-dark);
    margin-bottom: 0.5rem;
}

.header p {
    color: var(--clr-text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.author-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(27, 171, 154, 0.08);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--clr-text-light);
    border: 1px solid rgba(27, 171, 154, 0.15);
}

.author-badge a {
    color: var(--clr-primary);
    text-decoration: none;
    font-weight: 700;
}

.author-badge a:hover {
    text-decoration: underline;
}

.apply-date {
    display: inline-block;
    background: rgba(27, 171, 154, 0.1);
    color: var(--clr-primary-dark);
    font-weight: 700;
    font-size: 1.05rem;
    padding: 0.4rem 1.2rem;
    border-radius: var(--radius-full);
    margin: 0.5rem 0;
    border: 1px solid rgba(27, 171, 154, 0.2);
}

/* --- Card & Form --- */
.card {
    background: var(--clr-white);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

input,
select {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1.5px solid #E0E0E0;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s;
    background: white;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--clr-primary);
}

select {
    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='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
}

.btn-calc {
    width: 100%;
    background: var(--clr-primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
}

.btn-calc:hover {
    background: var(--clr-primary-dark);
    transform: translateY(-2px);
}

/* --- Results --- */
.result-section {
    display: none;
    margin-top: 2rem;
    border-top: 1px solid #EEE;
    padding-top: 2rem;
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-item {
    background: #F1FBFA;
    padding: 1.25rem;
    border-radius: 12px;
    text-align: center;
}

.result-label {
    font-size: 0.8rem;
    color: var(--clr-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--clr-primary-dark);
}

.result-value.total,
.result-value.net {
    color: #E67E22;
}

.result-value.total {
    font-size: 2rem;
}

/* --- Table --- */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th,
td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #EEE;
}

th {
    color: var(--clr-text-light);
    font-weight: 600;
}

/* --- Links & Misc --- */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--clr-primary);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-note {
    font-size: 0.8rem;
    color: var(--clr-text-light);
    text-align: center;
    margin-top: 2rem;
}

/* --- Ads Section --- */
.lstu-ads {
    background: linear-gradient(135deg, #1BAB9A 0%, #15887A 100%);
    color: white;
    padding: 1.8rem;
    border-radius: 16px;
    margin-top: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(27, 171, 154, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.lstu-ads::before {
    content: "ƯU ĐÃI";
    position: absolute;
    top: 12px;
    left: -35px;
    background: #E67E22;
    color: white;
    padding: 5px 45px;
    font-size: 0.75rem;
    font-weight: 800;
    transform: rotate(-45deg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.lstu-ads p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    line-height: 1.4;
}

.lstu-ads .price-tag {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.lstu-ads .price-old {
    text-decoration: line-through;
    margin-right: 8px;
    opacity: 0.7;
}

.lstu-ads .price-new {
    color: #FFEB3B;
    font-weight: 800;
    font-size: 1.2rem;
}

.lstu-ads a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    color: var(--clr-primary-dark);
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.lstu-ads a:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    background: #f8f8f8;
}

/* --- Specific for Business Tax --- */
.method-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.method-option {
    border: 1.5px solid #E0E0E0;
    border-radius: 8px;
    padding: 0.8rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
    font-weight: 500;
}

.method-option.active {
    border-color: var(--clr-primary);
    background: #F1FBFA;
    color: var(--clr-primary-dark);
    font-weight: 700;
}

.method-option.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: #F5F5F5;
}

.exemption-msg {
    background: #FFF9C4;
    color: #F57F17;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: none;
}

/* --- Responsive --- */
@media (max-width: 600px) {

    .result-grid,
    .method-selector {
        grid-template-columns: 1fr;
    }

    .lstu-ads {
        padding: 2rem 1.5rem;
    }
}