* {
    box-sizing: border-box;
}

body {
    font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(180deg, #f7f6f2 0%, #f2f4f8 100%);
    color: #1f2a37;
    margin: 0;
    padding: 24px 0 48px;
}

.site-header {
    width: min(1100px, 92%);
    text-align: center;
    margin-top: 6px;
}

.page-subtitle {
    margin: 8px 0 12px;
    color: #5a6a82;
    font-size: 15px;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 16px;
}

.site-nav a {
    text-decoration: none;
    color: #2b3a52;
    background: #f1f4fb;
    border: 1px solid #dde3f0;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 13px;
}

#invoice-form {
    width: min(1100px, 92%);
    margin-top: 20px;
    border: 1px solid #d6dbe6;
    background: #ffffff;
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 18px 45px rgba(25, 38, 64, 0.12);
}

.auth-panel {
    width: min(1100px, 92%);
    background: #ffffff;
    border: 1px solid #d6dbe6;
    border-radius: 16px;
    padding: 16px 20px;
    margin-top: 16px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 16px;
    box-shadow: 0 12px 28px rgba(25, 38, 64, 0.08);
}

.auth-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    background: linear-gradient(135deg, #f7f9ff 0%, #eef3ff 100%);
    border: 1px solid #dbe2f2;
    border-radius: 14px;
    padding: 12px;
}

.auth-fields input {
    height: 46px;
    font-size: 16px;
    background: #ffffff;
    border: 1px solid #e1e6f0;
}

.auth-fields label {
    font-size: 13px;
    color: #4a5b75;
    margin-bottom: 0;
}

.auth-fields input:focus {
    border-color: #3a7bff;
    box-shadow: 0 0 0 3px rgba(58, 123, 255, 0.18);
}

.auth-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    justify-content: center;
}

.auth-actions button {
    height: 40px;
    border-radius: 10px;
    border: 1px solid #cfd6e6;
    background: #f7f9fd;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
}

.auth-actions button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.auth-note {
    font-size: 12px;
    color: #6a768c;
    margin: 4px 0 0;
}

.auth-status {
    font-size: 13px;
    font-weight: 600;
    margin: 0;
    color: #d26b6b;
}

.coupang-ad {
    width: min(1100px, 92%);
    margin: 18px auto 0;
    text-align: center;
    background: #ffffff;
    border: 1px solid #e1e6f0;
    border-radius: 14px;
    padding: 12px;
    box-shadow: 0 10px 24px rgba(25, 38, 64, 0.08);
}

.coupang-ad img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.coupang-ad p {
    margin: 6px 0 0;
    font-size: 11px;
    color: #9aa3b2;
}

.content-section {
    width: min(1100px, 92%);
    background: #ffffff;
    border: 1px solid #d6dbe6;
    border-radius: 16px;
    padding: 20px 24px;
    margin-top: 20px;
    box-shadow: 0 12px 28px rgba(25, 38, 64, 0.08);
}

.content-section h2 {
    margin: 0 0 10px;
}

.content-section h3 {
    margin: 12px 0 6px;
    font-size: 15px;
}

.content-section p,
.content-section li {
    color: #3a495f;
    line-height: 1.6;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.resource-card {
    display: block;
    border: 1px solid #e5e9f2;
    border-radius: 14px;
    padding: 14px;
    text-decoration: none;
    color: inherit;
    background: #f9fafc;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.resource-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(25, 38, 64, 0.12);
}

.resource-card h3 {
    margin: 0 0 6px;
    font-size: 16px;
}

.resource-card p {
    margin: 0;
    font-size: 13px;
    color: #5a6a82;
}

.guide-list {
    margin: 0;
    padding-left: 18px;
}

.guide-block {
    background: #f9fafc;
    border: 1px solid #e5e9f2;
    border-radius: 12px;
    padding: 12px;
}

.policy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.policy-grid > div {
    background: #f9fafc;
    border: 1px solid #e5e9f2;
    border-radius: 12px;
    padding: 12px;
}

.is-logged-out #invoice-form,
.is-logged-out .invoice-preview,
.is-logged-out .totals,
.is-logged-out #generate-invoice,
.is-logged-out #print-invoice,
.is-logged-out #download-pdf {
    opacity: 0.45;
    pointer-events: none;
}

.company-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 16px;
}

.supplier, .recipient {
    width: 50%;
    border: 1px solid #d6dbe6;
    padding: 16px;
    border-radius: 12px;
    background: #f9fafc;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.field-row > label {
    width: 100%;
}

label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #3a495f;
}

input[type="text"], input[type="number"], input[type="date"], textarea {
    width: 100%;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid #cbd2e1;
    background: #ffffff;
    font-size: 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus, input[type="number"]:focus, input[type="date"]:focus, textarea:focus {
    outline: none;
    border-color: #2f80ed;
    box-shadow: 0 0 0 3px rgba(47, 128, 237, 0.16);
}

#invoice-items {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 20px;
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e5e9f2;
}

#invoice-items th, #invoice-items td {
    border: 1px solid #e5e9f2;
    padding: 10px;
    text-align: center;
}

#invoice-items th {
    background-color: #eff3f9;
    color: #2b3a52;
    font-weight: 600;
}

.totals {
    width: min(1100px, 92%);
    margin-top: 20px;
    text-align: right;
    background: #ffffff;
    border: 1px solid #d6dbe6;
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: 0 10px 30px rgba(25, 38, 64, 0.1);
}

#generate-invoice {
    display: block;
    margin: 20px auto;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

#print-invoice,
#download-pdf {
    padding: 10px 20px;
    margin: 10px 6px 0;
    border-radius: 10px;
    border: 1px solid #cfd6e6;
    background: linear-gradient(180deg, #ffffff 0%, #f1f4f9 100%);
    color: #2b3a52;
    cursor: pointer;
    font-size: 15px;
    min-width: 160px;
    height: 42px;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

#print-invoice:hover,
#download-pdf:hover {
    border-color: #b9c4da;
    box-shadow: 0 8px 18px rgba(25, 38, 64, 0.12);
    transform: translateY(-1px);
}

#print-invoice:active,
#download-pdf:active {
    transform: translateY(0);
    box-shadow: none;
}

.stamp-upload-row {
    display: grid;
    gap: 6px;
    margin-top: 6px;
}

.stamp-upload-row input[type="file"] {
    font-size: 12px;
}

#supplier-stamp-preview {
    width: 27px;
    height: 27px;
    border-radius: 8px;
    border: 1px dashed #b7bfd3;
    object-fit: contain;
    background: #ffffff;
    display: none;
}

.terms-section {
    margin-top: 16px;
}

.terms-section textarea {
    resize: vertical;
    min-height: 90px;
}

.invoice-preview {
    width: 210mm;
    max-width: 210mm;
    margin-top: 20px;
    border: 1px solid #d6dbe6;
    padding: 24px;
    border-radius: 16px;
    background: #ffffff;
    box-shadow: 0 18px 45px rgba(25, 38, 64, 0.12);
    position: relative;
    overflow: visible;
    font-size: 13px;
}

.invoice-header {
    text-align: center;
    margin-bottom: 20px;
}

.invoice-company-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 16px;
}

.invoice-supplier, .invoice-recipient {
    width: 50%;
    border: 1px solid #d6dbe6;
    padding: 16px;
    border-radius: 12px;
    background: #f9fafc;
    position: relative;
    overflow: visible;
}

#preview-supplier-stamp {
    position: absolute;
    top: 52px;
    right: 18px;
    width: 50px;
    height: 50px;
    object-fit: contain;
    z-index: 10;
    display: none;
}

.inline-sep {
    margin-left: 10px;
}

.pair-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 0 0 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e5e9f2;
}

.pair-col {
    display: flex;
    align-items: baseline;
    gap: 6px;
    min-width: 0;
}

.invoice-company-info p {
    margin: 0 0 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e5e9f2;
}

.invoice-company-info p:last-of-type,
.invoice-company-info .pair-row:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.invoice-items-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    border: 1px solid #e5e9f2;
}

.invoice-items-table th, .invoice-items-table td {
    border: 1px solid #e5e9f2;
    padding: 8px;
    text-align: center;
}

.invoice-items-table td:nth-child(2),
.invoice-items-table td:nth-child(3),
.invoice-items-table td:nth-child(4),
.invoice-items-table td:nth-child(5) {
    text-align: right;
    padding-right: 12px;
}

.invoice-items-table th {
    background-color: #eff3f9;
}

.invoice-totals {
    text-align: right;
    border-top: 1px solid #d6dbe6;
    padding-top: 12px;
}

.invoice-terms {
    margin-top: 16px;
    border-top: 1px solid #d6dbe6;
    padding-top: 12px;
    color: #2b3a52;
}

.invoice-terms p {
    white-space: pre-line;
    margin: 8px 0 0;
}

.site-footer {
    width: min(1100px, 92%);
    margin-top: 18px;
    padding: 12px 16px;
    text-align: center;
    color: #7c879b;
    font-size: 13px;
    border-top: 1px solid #e4e8f1;
}

.site-footer p {
    margin: 0;
    letter-spacing: 0.2px;
}

@media screen and (max-width: 768px) {
    body {
        font-size: 14px;
    }

    .site-nav {
        gap: 8px;
    }

    .auth-panel {
        grid-template-columns: 1fr;
    }

    .auth-fields {
        grid-template-columns: 1fr;
    }

    .auth-actions {
        align-items: stretch;
    }

    .auth-actions button {
        width: 100%;
    }

    .company-info {
        flex-direction: column;
    }

    .supplier, .recipient {
        width: 100%;
        margin-bottom: 20px;
    }

    .field-row {
        grid-template-columns: 1fr;
    }

    .policy-grid {
        grid-template-columns: 1fr;
    }
}