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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--tg-theme-bg-color, #f5f5f5);
    color: var(--tg-theme-text-color, #333);
    min-height: 100vh;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 24px;
}

header h1 {
    font-size: 24px;
    margin-bottom: 8px;
}

header p {
    color: var(--tg-theme-hint-color, #999);
    font-size: 14px;
}

.section {
    background: var(--tg-theme-secondary-bg-color, #fff);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.section h2 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--tg-theme-text-color, #333);
}

.links-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.link-item {
    display: flex;
    align-items: center;
    padding: 12px;
    border-radius: 8px;
    background: var(--tg-theme-bg-color, #f9f9f9);
    cursor: pointer;
    transition: all 0.2s;
}

.link-item:hover {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
}

.link-item.selected {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
}

.link-item .name {
    font-weight: 500;
    flex: 1;
}

.link-item .url {
    font-size: 12px;
    opacity: 0.7;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

input {
    padding: 12px;
    border: 1px solid var(--tg-theme-hint-color, #ddd);
    border-radius: 8px;
    font-size: 14px;
    background: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #333);
}

input:focus {
    outline: none;
    border-color: var(--tg-theme-button-color, #3390ec);
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.9;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
    width: 100%;
}

.btn-warning {
    background: #ffc107;
    color: #000;
    width: 100%;
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-secondary {
    background: var(--tg-theme-secondary-bg-color, #e5e5e5);
    color: var(--tg-theme-text-color, #333);
}

.selected-link {
    background: var(--tg-theme-bg-color, #f9f9f9);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 12px;
}

.selected-link .name {
    font-weight: 500;
    display: block;
    margin-bottom: 4px;
}

.selected-link .url {
    font-size: 12px;
    color: var(--tg-theme-link-color, #3390ec);
    word-break: break-all;
}

.status {
    margin-top: 12px;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
}

.status.success {
    background: #d4edda;
    color: #155724;
}

.status.error {
    background: #f8d7da;
    color: #721c24;
}

.status.info {
    background: #d1ecf1;
    color: #0c5460;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--tg-theme-hint-color, #ddd);
    border-top-color: var(--tg-theme-button-color, #3390ec);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

.error {
    text-align: center;
    padding: 40px 20px;
}

.error p {
    margin-bottom: 8px;
}

.error p:first-child {
    font-size: 18px;
    font-weight: 500;
}

/* Large button for NFC writing */
.btn-large {
    width: 100%;
    padding: 20px;
    font-size: 18px;
    margin-top: 16px;
    min-height: 60px;
}