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

:root {
    --tg-theme-bg-color: var(--tg-theme-bg-color, #ffffff);
    --tg-theme-text-color: var(--tg-theme-text-color, #000000);
    --tg-theme-hint-color: var(--tg-theme-hint-color, #999999);
    --tg-theme-link-color: var(--tg-theme-link-color, #2481cc);
    --tg-theme-button-color: var(--tg-theme-button-color, #2481cc);
    --tg-theme-button-text-color: var(--tg-theme-button-text-color, #ffffff);
    --tg-theme-secondary-bg-color: var(--tg-theme-secondary-bg-color, #f1f1f1);
    
    --primary-color: #2481cc;
    --primary-dark: #1a6ba8;
    --primary-light: #4a9de8;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --border-radius: 16px;
    --border-radius-sm: 12px;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow: 0 4px 12px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.16);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(180deg, var(--tg-theme-bg-color) 0%, var(--tg-theme-secondary-bg-color) 100%);
    background-attachment: fixed;
    color: var(--tg-theme-text-color);
    line-height: 1.6;
    padding-bottom: 100px;
    min-height: 100vh;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px 16px;
    text-align: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.user-info {
    font-size: 13px;
    opacity: 0.95;
    font-weight: 500;
}

/* Loading */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: 20px;
}

.loading.hidden {
    display: none;
}

.loading p {
    color: var(--tg-theme-hint-color);
    font-size: 14px;
    font-weight: 500;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--tg-theme-secondary-bg-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

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

.error-state h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--tg-theme-text-color);
}

.error-state p {
    color: var(--tg-theme-hint-color);
    margin: 8px 0;
}

.error-state a {
    color: inherit;
}

.error-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

/* Navigation */
.nav {
    display: flex;
    gap: 10px;
    padding: 14px 16px;
    background: var(--tg-theme-bg-color);
    overflow-x: auto;
    position: sticky;
    top: 80px;
    z-index: 90;
    box-shadow: var(--shadow-sm);
    -webkit-overflow-scrolling: touch;
}

.nav::-webkit-scrollbar {
    display: none;
}

.nav.hidden {
    display: none;
}

.nav-btn {
    padding: 12px 20px;
    border: none;
    background: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.nav-btn:active {
    transform: scale(0.96);
}

.nav-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow);
}

/* Main Content */
.main {
    padding: 20px 16px;
    max-width: 600px;
    margin: 0 auto;
}

.view {
    animation: fadeIn 0.4s ease-out;
}

.view.hidden {
    display: none;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.view-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 12px;
}

.view-header h2 {
    font-size: 24px;
    font-weight: 700;
    flex: 1;
    letter-spacing: -0.5px;
}

.btn-back {
    background: var(--tg-theme-secondary-bg-color);
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.btn-back:active {
    transform: scale(0.95);
    background: var(--tg-theme-hint-color);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    letter-spacing: 0.3px;
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:active {
    transform: scale(0.96);
}

.btn-icon {
    background: var(--tg-theme-secondary-bg-color);
    border: none;
    font-size: 22px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.btn-icon:active {
    transform: scale(0.95);
    background: var(--danger-color);
    color: white;
}

.btn-add-fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    font-size: 28px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 50;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-add-fab:active {
    transform: scale(0.9);
    box-shadow: var(--shadow);
}

.btn-add-fab.hidden {
    display: none;
}

/* Listas */
.listas-container {
    display: grid;
    gap: 16px;
}

.lista-card {
    background: var(--tg-theme-bg-color);
    border-radius: var(--border-radius);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
}

.lista-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.lista-card:active {
    transform: translateY(0) scale(0.98);
}

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

.lista-card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--tg-theme-text-color);
    letter-spacing: -0.3px;
}

.lista-card-info {
    font-size: 14px;
    color: var(--tg-theme-hint-color);
    font-weight: 500;
}

/* Produtos */
.lista-info {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    color: white;
}

.total-container {
    font-size: 16px;
    font-weight: 600;
    opacity: 0.95;
}

.total-value {
    font-size: 32px;
    font-weight: 800;
    margin-left: 8px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
    letter-spacing: -0.5px;
}

.produtos-container {
    display: grid;
    gap: 16px;
}

.produto-card {
    background: var(--tg-theme-bg-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.produto-card:hover {
    box-shadow: var(--shadow);
}

.produto-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 12px;
}

.produto-nome {
    font-size: 17px;
    font-weight: 700;
    flex: 1;
    color: var(--tg-theme-text-color);
    letter-spacing: -0.3px;
}

.btn-deletar-produto {
    background: rgba(220, 53, 69, 0.1);
    border: none;
    color: var(--danger-color);
    font-size: 18px;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-deletar-produto:active {
    background: var(--danger-color);
    color: white;
    transform: scale(0.95);
}

.produto-info {
    font-size: 15px;
    color: var(--tg-theme-hint-color);
    margin-bottom: 4px;
    line-height: 1.8;
    font-weight: 500;
}

.produto-info b {
    color: var(--primary-color);
    font-weight: 700;
}

.produto-valor {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn 0.3s;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background: var(--tg-theme-bg-color);
    border-radius: var(--border-radius);
    padding: 28px;
    width: 100%;
    max-width: 420px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal.hidden {
    display: none;
}

.modal h3 {
    margin-bottom: 24px;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.modal-actions button {
    flex: 1;
}

.input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--tg-theme-secondary-bg-color);
    border-radius: var(--border-radius-sm);
    font-size: 16px;
    margin-bottom: 16px;
    background: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    transition: var(--transition);
    font-family: inherit;
}

.input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(36, 129, 204, 0.1);
}

.input::placeholder {
    color: var(--tg-theme-hint-color);
    opacity: 0.7;
}

select.input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23999' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

/* Ofertas */
.ofertas-container {
    display: grid;
    gap: 16px;
}

.oferta-card {
    background: var(--tg-theme-bg-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
}

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

.oferta-produto {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.oferta-preco {
    font-size: 22px;
    font-weight: 800;
    color: var(--success-color);
    letter-spacing: -0.5px;
}

.oferta-info {
    font-size: 14px;
    color: var(--tg-theme-hint-color);
    font-weight: 500;
}

/* Config */
.config-container {
    display: grid;
    gap: 16px;
}

.config-item {
    background: var(--tg-theme-bg-color);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
}

.config-item span:first-child {
    font-weight: 600;
    color: var(--tg-theme-text-color);
}

.config-item span:last-child {
    color: var(--tg-theme-hint-color);
    font-weight: 500;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--tg-theme-hint-color);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.6;
}

.empty-state p {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
}

.empty-state p:last-child {
    font-size: 14px;
    opacity: 0.8;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--tg-theme-secondary-bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--tg-theme-hint-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}