:root {
    --ink: #17202a;
    --muted-ink: #65717d;
    --navy: #183b56;
    --blue: #2b6f8f;
    --paper: #fffdf8;
    --cream: #f5efe5;
    --line: #d8d4cc;
    --shadow: 0 18px 45px rgba(33, 48, 61, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    padding: 3rem 1.25rem;
    color: var(--ink);
    background: linear-gradient(135deg, #e9f1f3 0%, #f7f2e9 52%, #e7edf1 100%);
    font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

[hidden] {
    display: none !important;
}

#auth-screen {
    display: grid;
    min-height: calc(100vh - 6rem);
    place-items: center;
}

.auth-card {
    width: min(100%, 460px);
    padding: clamp(1.75rem, 5vw, 3.5rem);
    background: var(--paper);
    border: 1px solid rgba(24, 59, 86, 0.12);
    box-shadow: var(--shadow);
}

.eyebrow {
    margin: 0 0 0.75rem;
    color: var(--blue);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.auth-card h1 {
    margin: 0;
    color: var(--navy);
    font-family: Georgia, serif;
    font-size: clamp(2rem, 6vw, 3.4rem);
    font-weight: 500;
    line-height: 1.05;
}

.auth-intro {
    margin: 1.25rem 0 2rem;
    color: var(--muted-ink);
    line-height: 1.6;
}

#auth-form {
    display: grid;
    gap: 1rem;
}

#auth-form .form-group {
    margin: 0;
}

#authSubmitButton {
    margin-top: 0.5rem;
    padding: 0.8rem 1rem;
    color: #fff;
    background: var(--navy);
    border: 0;
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
}

#authSubmitButton:hover:not(:disabled) {
    background: var(--blue);
}

.text-button {
    padding: 0;
    color: var(--blue);
    background: transparent;
    border: 0;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    text-align: left;
}

.text-button:hover {
    color: var(--navy);
    text-decoration: underline;
}

.auth-status {
    min-height: 1.25rem;
    margin: 0;
    color: #a53c36;
}

#main-container {
    width: min(100%, 980px);
    margin: 0 auto;
    padding: 2.5rem clamp(1.25rem, 4vw, 4rem);
    background: var(--paper);
    border: 1px solid rgba(24, 59, 86, 0.12);
    box-shadow: var(--shadow);
}

.top-navigation {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 2rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--line);
}

.nav-menu {
    position: relative;
}

.nav-menu summary {
    list-style: none;
    padding: 0.65rem 0.9rem;
    color: var(--navy);
    background: transparent;
    border: 1px solid var(--blue);
    border-radius: 0.25rem;
    cursor: pointer;
    font-weight: 700;
}

.nav-menu summary::-webkit-details-marker {
    display: none;
}

.nav-menu summary::after {
    margin-left: 0.5rem;
    content: "▾";
}

.nav-menu[open] summary::after {
    content: "▴";
}

.nav-menu-content {
    position: absolute;
    z-index: 2;
    top: calc(100% + 0.45rem);
    left: 0;
    display: grid;
    min-width: 20rem;
    gap: 0.35rem;
    padding: 0.55rem;
    background: var(--paper);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.nav-menu-content .nav-button,
.nav-menu-content .text-button {
    width: 100%;
    white-space: nowrap;
    text-align: left;
}

.menu-icon {
    display: inline-block;
    width: 1.35rem;
    margin-right: 0.35rem;
    text-align: center;
    vertical-align: middle;
}

.menu-icon svg {
    display: block;
    width: 1.05rem;
    height: 1.05rem;
    margin: 0 auto;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2;
}

.current-view-label {
    color: var(--muted-ink);
    font-size: 0.9rem;
    font-weight: 700;
}

.nav-account {
    margin-left: auto;
}

.nav-account summary {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    max-width: 280px;
}

.nav-account .nav-menu-content {
    right: 0;
    left: auto;
}

.danger-nav-button {
    color: #8c3d36 !important;
    border-color: #c47a72 !important;
}

.danger-nav-button:hover {
    color: #fff !important;
    background: #a53c36 !important;
}

.nav-button,
.primary-action {
    padding: 0.65rem 0.9rem;
    color: var(--navy);
    background: transparent;
    border: 1px solid var(--blue);
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
}

.primary-nav-button,
.primary-action {
    color: #fff;
    background: var(--navy);
}

.nav-button:hover,
.primary-action:hover {
    color: #fff;
    background: var(--blue);
}

.nav-account {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-left: auto;
}

.account-mark {
    position: relative;
    display: inline-block;
    width: 1.6rem;
    height: 1.6rem;
    border: 1px solid var(--blue);
    border-radius: 50%;
}

.account-mark::before {
    position: absolute;
    top: 0.28rem;
    left: 0.52rem;
    width: 0.42rem;
    height: 0.42rem;
    background: var(--blue);
    border-radius: 50%;
    content: "";
}

.account-mark::after {
    position: absolute;
    bottom: 0.25rem;
    left: 0.32rem;
    width: 0.8rem;
    height: 0.42rem;
    background: var(--blue);
    border-radius: 0.5rem 0.5rem 0.25rem 0.25rem;
    content: "";
}

.invoice-list-screen {
    width: 100%;
}

.screen-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.screen-heading h1 {
    margin: 0;
    color: var(--navy);
    font-family: Georgia, serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 500;
}

.screen-heading .eyebrow {
    margin-bottom: 0.35rem;
}

.invoice-list {
    display: grid;
    gap: 0.75rem;
}

.invoice-list-row {
    display: flex;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0.75rem;
    background: #f4f7fb;
    border: 1px solid var(--line);
}

.invoice-open-button {
    display: grid;
    grid-template-columns: minmax(8rem, 0.8fr) minmax(10rem, 2fr) auto;
    align-items: center;
    flex: 1;
    gap: 1rem;
    padding: 0.5rem;
    color: var(--ink);
    background: transparent;
    border: 0;
    cursor: pointer;
    font: inherit;
    text-align: left;
}

.invoice-open-button strong {
    color: var(--navy);
}

.invoice-open-button small {
    color: var(--muted-ink);
}

.invoice-delete-button {
    align-self: center;
    padding: 0.55rem 0.75rem;
    color: #8c3d36;
    background: transparent;
    border: 1px solid #c47a72;
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
}

.invoice-delete-button:hover {
    color: #fff;
    background: #a53c36;
}

.empty-list {
    padding: 2.5rem 1rem;
    color: var(--muted-ink);
    background: #f4f7fb;
    border: 1px dashed var(--line);
    text-align: center;
}

.invoice-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 820px;
    color: var(--muted-ink);
    font-size: 0.9rem;
}

.invoice-meta span {
    color: var(--navy);
    font-weight: 700;
}

.save-invoice-button {
    align-self: center;
    padding: 0.75rem 1rem;
    color: #fff;
    background: var(--blue);
    border: 0;
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
}

.save-invoice-button:hover {
    background: var(--navy);
}

.invoice-save-status {
    min-height: 1.25rem;
    margin: -1.25rem 0 0;
    color: var(--muted-ink);
    text-align: center;
}

#main-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.app-heading {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    gap: 1rem;
}

.app-heading h2 {
    width: auto;
    margin: 0;
    color: var(--navy);
    font-family: Georgia, serif;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 500;
    letter-spacing: 0.02em;
    text-align: center;
}

.app-heading .text-button {
    color: var(--muted-ink);
    font-size: 0.85rem;
    font-weight: 700;
}

.account-controls {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.75rem;
}

.account-bar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    width: 100%;
    gap: 0.75rem;
    min-height: 1.5rem;
}

.signed-in-email {
    max-width: 220px;
    overflow: hidden;
    color: var(--muted-ink);
    font-size: 0.8rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.password-panel {
    width: 100%;
    max-width: 820px;
    padding: 1rem 1.25rem;
    background: #f4f7fb;
    border: 1px solid var(--line);
}

.password-panel h3 {
    margin: 0 0 1rem;
    color: var(--navy);
    font-family: Georgia, serif;
    font-weight: 500;
}

.password-fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.payment-preset-actions {
    display: grid;
    grid-template-columns: 1fr;
    align-items: center;
    gap: 0.65rem;
    margin-bottom: 1rem;
}

.payment-preset-name {
    margin-bottom: 1rem;
}

.payment-preset-actions button {
    min-height: 2.6rem;
    padding: 0.55rem 0.7rem;
    color: var(--navy);
    background: transparent;
    border: 1px solid var(--blue);
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
}

.payment-preset-actions button:hover:not(:disabled) {
    color: #fff;
    background: var(--blue);
}

.payment-preset-actions .secondary-button {
    color: #8c3d36;
    border-color: #c47a72;
}

.payment-preset-actions .secondary-button:hover:not(:disabled) {
    background: #a53c36;
}

.payment-preset-actions button:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.payment-preset-column,
.payment-account-column {
    min-width: 0;
}

.form-chapter {
    display: flex;
    flex-direction: row;
    gap: 2rem;
    width: 100%;
    max-width: 820px;
}

.form-chapter:not(.supplier-customer-section) {
    padding-top: 1.5rem;
    border-top: 1px solid var(--line);
}

.form-part {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.form-group label {
    margin-bottom: 0.25rem;
    color: var(--muted-ink);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.form-group input {
    width: 100%;
    padding: 0.65rem 0.7rem;
    color: var(--ink);
    background: #fff;
    border: 1px solid #c8d0d5;
    border-radius: 0.25rem;
    font: inherit;
}

.form-group input:focus {
    border-color: var(--blue);
    outline: 2px solid rgba(43, 111, 143, 0.18);
    outline-offset: 1px;
}

.field-hint {
    margin: 0.35rem 0 0;
    color: var(--muted-ink);
    font-size: 0.8rem;
}

.form-group output {
    min-height: 1.5rem;
    padding: 0.25rem 0;
    color: var(--navy);
    font-family: Georgia, serif;
    font-size: 1.5rem;
    font-weight: 700;
}

.second-row {
    align-items: flex-start;
}

.second-row > .form-part,
.second-row > .form-group {
    flex: 1;
}


.third-row {
    align-items: flex-start;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
}

.signature-row {
    align-items: flex-start;
}

.signature-group {
    width: 100%;
    max-width: 420px;
}

.signature-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 120px;
    padding: 1rem;
    text-align: center;
    color: var(--muted-ink);
    background: #fff;
    border: 2px dashed #c8d0d5;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.signature-dropzone:hover,
.signature-dropzone:focus-visible {
    border-color: var(--blue);
    outline: none;
}

.signature-dropzone.is-dragover {
    border-color: var(--blue);
    background: rgba(43, 111, 143, 0.08);
}

.signature-dropzone-text {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.4;
}

.signature-preview {
    display: block;
    max-width: 100%;
    max-height: 130px;
    object-fit: contain;
    border-radius: 0.25rem;
}

.signature-actions {
    margin-top: 0.5rem;
}

.signature-save-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.signature-save-row input {
    min-width: 0;
    padding: 0.55rem 0.7rem;
    color: var(--ink);
    background: #fff;
    border: 1px solid #c8d0d5;
    border-radius: 0.25rem;
    font: inherit;
}

.signature-save-row button {
    padding: 0.55rem 0.7rem;
    color: var(--navy);
    background: transparent;
    border: 1px solid var(--blue);
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
}

.signature-save-row button:hover:not(:disabled) {
    color: #fff;
    background: var(--blue);
}

.signature-save-row .secondary-button {
    color: #8c3c36;
    border-color: #c47a72;
}

.signature-save-row .secondary-button:hover:not(:disabled) {
    color: #fff;
    background: #a53c36;
}

.signature-save-row button:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.signature-status {
    margin: 0.4rem 0 0;
    min-height: 1.1rem;
    color: var(--muted-ink);
    font-size: 0.8rem;
}

.signature-status.is-error {
    color: #b3261e;
}

.total-amount-group {
    grid-column: 1 / -1;
    margin: 0;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}

.supplier-customer-section {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2rem;
    width: 100%;
    max-width: 820px;
}

.supplier-customer-section > h2 {
    grid-column: 1 / -1;
    margin: 0 0 1.5rem;
    text-align: center;
}

.form-part h3 {
    margin-top: 0;
    color: var(--navy);
    font-family: Georgia, serif;
    font-size: 1.35rem;
    font-weight: 500;
}

select {
    width: 100%;
    padding: 0.65rem 0.7rem;
    color: var(--ink);
    background: #fff;
    border: 1px solid #c8d0d5;
    border-radius: 0.25rem;
    font: inherit;
}

select:focus {
    border-color: var(--blue);
    outline: 2px solid rgba(43, 111, 143, 0.18);
    outline-offset: 1px;
}

.person-fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.saved-data-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: center;
    gap: 0.65rem;
    margin-top: 0.25rem;
}

.saved-data-actions button {
    min-height: 2.6rem;
}

.client-actions,
#dodavatelWrapper > .saved-data-actions {
    width: 100%;
}

.client-actions button,
#dodavatelWrapper > .saved-data-actions button {
    min-width: 0;
    white-space: nowrap;
}

.saved-data-actions > [role="status"] {
    grid-column: 1 / -1;
}

.saved-data-actions button {
    padding: 0.55rem 0.75rem;
    color: var(--navy);
    background: transparent;
    border: 1px solid var(--blue);
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 700;
}

.saved-data-actions button:hover:not(:disabled) {
    color: #fff;
    background: var(--blue);
}

.saved-data-actions .secondary-button {
    color: #8c3d36;
    border-color: #c47a72;
}

.saved-data-actions .secondary-button:hover:not(:disabled) {
    background: #a53c36;
}

.saved-data-actions button:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

#supplierSaveStatus {
    color: var(--muted-ink);
    font-size: 0.85rem;
}

#itemsContainer {
    width: 100%;
}

.invoice-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    align-items: end;
    gap: 1rem;
    width: 100%;
    margin-top: 1.5rem;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 0.25rem;
    box-shadow: 0 3px 10px rgba(33, 48, 61, 0.04);
}

.invoice-item:nth-child(even) {
    background: #f4f7fb;
}

.invoice-item:nth-child(odd) {
    background: #fffaf0;
}

.invoice-item .form-group {
    margin-bottom: 0;
}

.invoice-item input {
    width: 100%;
}

.delete-item-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    color: #a53c36;
    background: transparent;
    border: 1px solid #c47a72;
    border-radius: 0.25rem;
    cursor: pointer;
}

.delete-item-button:hover {
    color: white;
    background-color: #a53c36;
}

.delete-item-button:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

#printInvoiceButton {
    align-self: center;
    color: #fff;
    background: var(--navy);
    border: 0;
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    padding: 0.75rem 1rem;
    transition: background-color 160ms ease, transform 160ms ease;
}

#printInvoiceButton:hover {
    background: var(--blue);
    transform: translateY(-1px);
}

#addItemButton {
    align-self: flex-start;
    color: var(--navy);
    background: transparent;
    border: 1px solid var(--blue);
    border-radius: 0.25rem;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    padding: 0.6rem 0.85rem;
    margin-bottom: 0.25rem;
}

#addItemButton:hover {
    color: #fff;
    background: var(--blue);
}

#printInvoiceButton {
    margin-top: 0.25rem;
}

@media (max-width: 700px) {
    body {
        padding: 1rem 0.5rem;
    }

    #main-container {
        padding: 1.5rem 1rem;
    }

    .top-navigation,
    .nav-account {
        flex-wrap: wrap;
    }

    .nav-account {
        justify-content: flex-start;
        width: 100%;
        margin-left: 0;
    }

    .screen-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .invoice-open-button {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .supplier-customer-section {
        grid-template-columns: 1fr;
        row-gap: 1rem;
    }

    .app-heading {
        flex-direction: column;
        gap: 0.75rem;
    }

    .account-bar {
        justify-content: center;
        flex-wrap: wrap;
    }

    .password-fields,
    .person-fields,
    .third-row {
        grid-template-columns: 1fr;
    }

    .total-amount-group {
        grid-column: auto;
    }

    .invoice-item {
        grid-template-columns: 1fr;
    }

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

    .delete-item-button {
        justify-self: end;
    }
}