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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a1628 0%, #1e3a5f 100%);
    color: #e2e8f0;
    line-height: 1.5;
    font-size: 14px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 20px 15px;
}

header {
    margin-bottom: 25px;
}

.back-link {
    color: #60a5fa;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    font-weight: 500;
    font-size: 0.9rem;
}

h1 {
    font-size: 1.6rem;
    color: #fff;
    margin-bottom: 8px;
    line-height: 1.3;
}

.meta {
    color: #94a3b8;
    font-size: 0.8rem;
    margin-bottom: 20px;
}

article {
    background: rgba(255, 255, 255, 0.03);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

h2 {
    color: #3b82f6;
    margin: 25px 0 12px;
    font-size: 1.2rem;
}

p {
    margin-bottom: 12px;
    color: #cbd5e1;
    font-size: 0.9rem;
}

ul {
    margin-bottom: 15px;
    padding-left: 18px;
    color: #cbd5e1;
    font-size: 0.85rem;
}

li {
    margin-bottom: 6px;
}

.calculator-box {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 10px;
    padding: 15px;
    margin: 20px 0;
}

.calc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.calc-title {
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    background: rgba(255, 255, 255, 0.02);
    padding: 6px 8px;
    border-radius: 5px;
}

.input-row label {
    flex: 1;
    font-size: 0.85rem;
}

.input-row input {
    width: 110px;
    background: #0f172a;
    border: 1px solid #334155;
    color: #fff;
    padding: 6px 8px;
    border-radius: 5px;
    font-size: 0.85rem;
    text-align: right;
}

.result-box {
    background: linear-gradient(135deg, #1e3a5f, #0f172a);
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.result-label {
    color: #94a3b8;
    font-size: 0.75rem;
    margin-bottom: 3px;
    text-align: center;
}

.result-amount {
    color: #34d399;
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
}

.result-detail {
    color: #cbd5e1;
    font-size: 0.75rem;
    margin-top: 8px;
    text-align: center;
}

.brackets {
    background: rgba(255, 255, 255, 0.03);
    padding: 8px;
    border-radius: 6px;
    margin-top: 10px;
    font-size: 0.7rem;
}

footer {
    margin-top: 30px;
    text-align: center;
    color: #64748b;
    font-size: 0.75rem;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer a {
    color: #60a5fa;
    text-decoration: none;
}

.info-box {
    background: rgba(59, 130, 246, 0.1);
    padding: 12px;
    border-radius: 8px;
    border-left: 3px solid #3b82f6;
    margin: 15px 0;
    font-size: 0.85rem;
}