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

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: Arial, sans-serif;
    background-color: #f5f7fa;
    color: #1f2937;
}

.container {
    width: 90%;
    max-width: 420px;
    text-align: center;
}

h1 {
    color: #5145fe;
    margin-bottom: 0.5rem;
}

.container > p {
    color: #6b7280;
    margin-bottom: 1.5rem;
}

.auth-card {
    background-color: white;
    padding: 2rem;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    text-align: left;
}

.tabs {
    display: flex;
    margin-bottom: 1.5rem;
}

.tabs button {
    width: 50%;
    padding: 0.75rem;
    background: none;
    border: none;
    border-bottom: 2px solid #e5e7eb;
    color: #6b7280;
    cursor: pointer;
    font-size: 1rem;
}

.tabs button.active {
    color: #2563eb;
    border-bottom: 2px solid #2563eb;
}

label {
    display: block;
    margin-bottom: 0.4rem;
}

input {
    width: 100%;
    padding: 0.7rem;
    margin-bottom: 0.3rem;
    border: 1px solid #d1d5db;
    border-radius: 5px;
}

input:focus {
    outline: none;
    border-color: #2563eb;
}

.submit-button {
    width: 100%;
    padding: 0.75rem;
    margin-top: 0.5rem;
    background-color: #2563eb;
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    font-size: 1rem;
}

.submit-button:hover {
    background-color: #1d4ed8;
}

.error {
    min-height: 18px;
    color: #b91c1c;
    font-size: 0.85rem;
    margin-bottom: 0.8rem;
}

.success {
    color: #15803d;
    font-size: 0.85rem;
    margin-bottom: 0.8rem;
}

.contact-card {
    background-color: white;
    padding: 2rem;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    text-align: left;
    margin-top: 1.5rem;
}

.contact-card h2 {
    color: #2563eb;
    margin-bottom: 1.5rem;
}

.hidden {
    display: none;
}

.message {
    min-height: 18px;
    font-size: 0.85rem;
    margin-bottom: 0.8rem;
}

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

.dashboard-page {
    align-items: flex-start;
    padding: 3rem 0;
}

.dashboard-container {
    width: 90%;
    max-width: 960px;
}

.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 2rem;
}

.dashboard-header p {
    color: #6b7280;
}

.dashboard-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem;
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
}

.search-form {
    display: flex;
    flex: 1;
    gap: 0.5rem;
}

.search-form input {
    margin: 0;
}

.primary-button,
.secondary-button,
.danger-button {
    padding: 0.7rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.95rem;
    white-space: nowrap;
}

.primary-button {
    color: white;
    background-color: #2563eb;
    border: 1px solid #2563eb;
}

.secondary-button {
    color: #1f2937;
    background-color: white;
    border: 1px solid #d1d5db;
}

.danger-button {
    color: #b91c1c;
    background-color: white;
    border: 1px solid #fecaca;
}

.primary-button:hover,
.primary-button:focus-visible {
    background-color: #1d4ed8;
}

.secondary-button:hover:not(:disabled),
.secondary-button:focus-visible:not(:disabled) {
    background-color: #f3f4f6;
}

.danger-button:hover:not(:disabled),
.danger-button:focus-visible:not(:disabled) {
    background-color: #fef2f2;
}

.primary-button:disabled,
.secondary-button:disabled,
.danger-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.feature-note {
    margin-top: 0.6rem;
    color: #6b7280;
    font-size: 0.85rem;
}

.dashboard-status {
    min-height: 1.5rem;
    margin: 1.5rem 0;
    text-align: center;
}

.contact-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
    list-style: none;
}

.dashboard-contact-card {
    height: 100%;
    padding: 1.25rem;
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
}

.dashboard-contact-card h2 {
    margin-bottom: 1rem;
    color: #2563eb;
    font-size: 1.2rem;
}

.contact-details > div {
    margin-bottom: 0.8rem;
}

.contact-details dt {
    color: #6b7280;
    font-size: 0.8rem;
    font-weight: bold;
    text-transform: uppercase;
}

.contact-details dd {
    margin-top: 0.2rem;
    overflow-wrap: anywhere;
}

.contact-actions {
    display: flex;
    gap: 0.5rem;
    padding-top: 0.5rem;
}

.contact-actions button {
    flex: 1;
}

.contact-dialog {
    width: min(90%, 480px);
    padding: 0;
    margin: auto;
    color: #1f2937;
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
}

.contact-dialog::backdrop {
    background-color: rgb(17 24 39 / 55%);
}

.contact-form {
    padding: 1.5rem;
}

.dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.dialog-header h2 {
    color: #2563eb;
}

.icon-button {
    padding: 0.25rem 0.5rem;
    color: #6b7280;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.75rem;
    line-height: 1;
}

.icon-button:hover:not(:disabled),
.icon-button:focus-visible:not(:disabled) {
    color: #1f2937;
}

.icon-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.contact-form input {
    margin-bottom: 1rem;
}

.contact-form .message {
    margin-bottom: 0.5rem;
}

.confirmation-text {
    margin-bottom: 1rem;
    line-height: 1.5;
}

.dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.pagination.hidden {
    display: none;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 768px) {
    body {
        align-items: flex-start;
        padding: 2rem 0;
    }

    .container,
    .dashboard-container {
        width: calc(100% - 2rem);
    }

    .auth-card {
        padding: 1.5rem;
    }

    .dashboard-page {
        padding: 2rem 0;
    }

    .dashboard-header {
        margin-bottom: 1.5rem;
    }

    .dashboard-header > div,
    .search-form {
        min-width: 0;
    }

    .dashboard-toolbar {
        align-items: stretch;
        flex-direction: column;
    }

    .search-form {
        width: 100%;
    }

    .search-form input {
        min-width: 0;
    }

    #add-contact-button {
        width: 100%;
    }

    .contact-dialog {
        max-height: calc(100vh - 2rem);
        overflow-y: auto;
    }
}

@media (max-width: 480px) {
    body,
    .dashboard-page {
        padding: 1.25rem 0;
    }

    .container,
    .dashboard-container {
        width: calc(100% - 1.5rem);
    }

    h1 {
        font-size: 1.75rem;
    }

    input {
        font-size: 1rem;
    }

    .auth-card,
    .contact-form {
        padding: 1.25rem;
    }

    .dashboard-header {
        align-items: stretch;
        flex-direction: column;
    }

    #logout-button {
        width: 100%;
    }

    .search-form,
    .dialog-actions {
        flex-direction: column;
    }

    .search-form button,
    .dialog-actions button {
        width: 100%;
    }

    .primary-button,
    .secondary-button,
    .danger-button,
    .submit-button,
    .tabs button {
        min-height: 44px;
    }

    .contact-list {
        grid-template-columns: minmax(0, 1fr);
    }

    .dashboard-contact-card {
        min-width: 0;
        padding: 1rem;
    }

    .contact-dialog {
        width: calc(100% - 1.5rem);
        max-height: calc(100vh - 1.5rem);
    }

    .pagination {
        gap: 0.5rem;
    }

    .pagination button {
        flex: 1;
        min-width: 0;
    }

    #page-summary {
        white-space: nowrap;
    }
}

@media (max-width: 360px) {
    .contact-actions {
        flex-direction: column;
    }
}