:root {
    --bg: var(--tg-theme-bg-color, #ffffff);
    --text: var(--tg-theme-text-color, #000000);
    --hint: var(--tg-theme-hint-color, #999999);
    --link: var(--tg-theme-link-color, #2481cc);
    --btn: var(--tg-theme-button-color, #2481cc);
    --btn-text: var(--tg-theme-button-text-color, #ffffff);
    --secondary-bg: var(--tg-theme-secondary-bg-color, #f0f0f0);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding-bottom: 70px;
}

.nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    background: var(--secondary-bg);
    border-top: 1px solid var(--hint);
    z-index: 100;
}

.nav-btn {
    flex: 1;
    padding: 12px 8px;
    border: none;
    background: transparent;
    color: var(--hint);
    font-size: 12px;
    cursor: pointer;
    transition: color 0.2s;
}

.nav-btn.active {
    color: var(--btn);
    font-weight: 600;
}

.page {
    display: none;
    padding: 16px;
}

.page.active {
    display: block;
}

.card {
    background: var(--secondary-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 12px;
}

h2 {
    font-size: 20px;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--hint);
    font-size: 14px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.qty-selector,
.duration-selector {
    display: flex;
    gap: 8px;
}

.qty-btn,
.dur-btn {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--hint);
    border-radius: 8px;
    background: transparent;
    color: var(--text);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.qty-btn.active,
.dur-btn.active {
    border-color: var(--btn);
    background: var(--btn);
    color: var(--btn-text);
}

.dur-btn {
    text-align: center;
}

.dur-btn small {
    font-weight: 400;
    font-size: 11px;
    opacity: 0.8;
}

.price-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-top: 1px solid var(--hint);
    margin-bottom: 16px;
}

.price {
    font-size: 24px;
    font-weight: 700;
    color: var(--btn);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 10px;
    background: var(--btn);
    color: var(--btn-text);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary:active {
    opacity: 0.8;
}

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

.btn-back {
    border: none;
    background: transparent;
    color: var(--link);
    font-size: 14px;
    cursor: pointer;
    margin-bottom: 12px;
    padding: 4px 0;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.card-header h2 {
    margin-bottom: 0;
}

.btn-icon {
    border: none;
    background: transparent;
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: transform 0.3s;
}

.btn-icon:active {
    background: var(--bg);
}

.btn-icon.spinning {
    animation: spin 0.8s linear infinite;
}

.msg-code {
    cursor: pointer;
    user-select: all;
}

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

.list-item {
    background: var(--bg);
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.list-item:active {
    opacity: 0.7;
}

.list-item .email-addr {
    font-size: 14px;
    font-weight: 600;
    word-break: break-all;
}

.list-item .email-meta {
    font-size: 12px;
    color: var(--hint);
    margin-top: 4px;
}

.list-item .msg-subject {
    font-size: 14px;
    font-weight: 500;
}

.list-item .msg-sender {
    font-size: 12px;
    color: var(--hint);
}

.list-item .msg-code {
    display: inline-block;
    margin-top: 4px;
    padding: 2px 8px;
    background: var(--btn);
    color: var(--btn-text);
    border-radius: 4px;
    font-size: 14px;
    font-weight: 700;
    font-family: monospace;
}

.list-item .msg-time {
    font-size: 11px;
    color: var(--hint);
    float: right;
}

.badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

.badge-active { background: #d4edda; color: #155724; }
.badge-pending { background: #fff3cd; color: #856404; }
.badge-expired { background: #f8d7da; color: #721c24; }
.badge-paid { background: #d4edda; color: #155724; }
.badge-failed { background: #f8d7da; color: #721c24; }

.empty {
    text-align: center;
    color: var(--hint);
    padding: 20px;
    font-size: 14px;
}

.loading {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    z-index: 200;
}

.loading.hidden {
    display: none;
}

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    z-index: 300;
    padding: 20px;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    max-width: 320px;
    width: 100%;
}

.modal-content h3 {
    margin-bottom: 16px;
    font-size: 18px;
}

.modal-content .hint {
    color: var(--hint);
    font-size: 12px;
    margin: 12px 0;
}

#qr-canvas {
    display: flex;
    justify-content: center;
    margin: 16px 0;
}

#qr-canvas canvas {
    border-radius: 8px;
}

.btn-secondary {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--hint);
    border-radius: 10px;
    background: transparent;
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 12px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--secondary-bg);
    border-top-color: var(--btn);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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