/* ===== Global Styles ===== */
:root {
    --tg-theme-bg-color: #ffffff;
    --tg-theme-text-color: #000000;
    --tg-theme-hint-color: #999999;
    --tg-theme-link-color: #2481cc;
    --tg-theme-button-color: #2481cc;
    --tg-theme-button-text-color: #ffffff;
    --tg-theme-secondary-bg-color: #f4f4f5;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--tg-theme-bg-color);
    color: var(--tg-theme-text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ===== Loader ===== */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--tg-theme-bg-color);
    z-index: 9999;
}

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

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

/* ===== Header ===== */
.app-header {
    padding: 16px;
    background: var(--tg-theme-secondary-bg-color);
    border-bottom: 1px solid rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 20px;
    font-weight: 600;
}

.user-info {
    font-size: 14px;
    color: var(--tg-theme-hint-color);
    margin-top: 4px;
}

/* ===== Tabs Navigation ===== */
.tabs {
    display: flex;
    background: var(--tg-theme-bg-color);
    border-bottom: 1px solid rgba(0,0,0,0.08);
    position: sticky;
    top: 73px;
    z-index: 99;
}

.tab {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--tg-theme-hint-color);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    font-size: 13px;
}

.tab-icon {
    font-size: 20px;
}

.tab.active {
    color: var(--tg-theme-button-color);
    border-bottom-color: var(--tg-theme-button-color);
}

/* ===== Search Bar ===== */
.search-bar {
    padding: 12px 16px;
    background: var(--tg-theme-bg-color);
    border-bottom: 1px solid rgba(0,0,0,0.08);
    display: flex;
    gap: 8px;
}

.search-bar input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    background: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    font-size: 14px;
}

.search-bar select {
    padding: 8px 12px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    background: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    font-size: 14px;
}

/* ===== Content Views ===== */
.content {
    padding: 16px;
    min-height: calc(100vh - 200px);
}

.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Books Grid ===== */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.book-card {
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.book-card:active {
    transform: scale(0.98);
}

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

.book-status {
    font-size: 20px;
}

.book-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.4;
}

.book-author {
    font-size: 14px;
    color: var(--tg-theme-hint-color);
    margin-bottom: 8px;
}

.book-owner {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

.book-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.btn-small {
    flex: 1;
    padding: 6px 12px;
    font-size: 13px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-small:active {
    opacity: 0.7;
}

.btn-borrow {
    background: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
}

.btn-return {
    background: #22c55e;
    color: white;
}

.btn-details {
    background: rgba(0,0,0,0.05);
    color: var(--tg-theme-text-color);
}

.btn-delete {
    background: #ef4444;
    color: white;
}

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

.empty-state p:first-child {
    font-size: 48px;
    margin-bottom: 12px;
}

/* ===== Form Styles ===== */
.form {
    max-width: 500px;
    margin: 0 auto;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    background: var(--tg-theme-secondary-bg-color);
    color: var(--tg-theme-text-color);
    font-size: 14px;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn:active {
    opacity: 0.8;
}

.btn-primary {
    background: var(--tg-theme-button-color);
    color: var(--tg-theme-button-text-color);
}

/* ===== Profile ===== */
.profile-card {
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
    padding: 24px;
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    background: var(--tg-theme-button-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: white;
}

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

.text-muted {
    color: var(--tg-theme-hint-color);
    font-size: 14px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--tg-theme-button-color);
}

.stat-label {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    padding: 20px;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--tg-theme-bg-color);
    border-radius: 12px;
    padding: 24px;
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(0,0,0,0.1);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    color: var(--tg-theme-text-color);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.history-item {
    padding: 12px;
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 8px;
    margin-bottom: 8px;
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

.history-username {
    font-weight: 500;
}

.history-date {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

.history-status {
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(0,0,0,0.05);
}

/* ===== Clubs Styles ===== */
.club-selector {
    padding: 15px;
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    margin-bottom: 20px;
}

.club-selector label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

.club-selector select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--tg-theme-hint-color);
    border-radius: 8px;
    font-size: 14px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.section-header h2, .section-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

.clubs-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.club-card {
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.club-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.club-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 8px;
}

.club-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.club-card-code {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
    font-family: monospace;
    background: rgba(0,0,0,0.05);
    padding: 2px 8px;
    border-radius: 4px;
}

.club-card-description {
    font-size: 14px;
    color: var(--tg-theme-hint-color);
    margin-bottom: 8px;
}

.club-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

.club-role-badge {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.role-owner {
    background: #fbbf24;
    color: #78350f;
}

.role-admin {
    background: #60a5fa;
    color: #1e3a8a;
}

.role-member {
    background: #86efac;
    color: #14532d;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

.members-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.member-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 8px;
}

.member-info {
    flex: 1;
}

.member-name {
    font-weight: 600;
    font-size: 14px;
}

.member-username {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

.member-actions {
    display: flex;
    gap: 8px;
}

.request-item {
    padding: 15px;
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 10px;
    margin-bottom: 12px;
}

.request-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 8px;
}

.request-user {
    font-weight: 600;
}

.request-date {
    font-size: 12px;
    color: var(--tg-theme-hint-color);
}

.request-message {
    font-size: 14px;
    color: var(--tg-theme-text-color);
    margin-bottom: 12px;
    font-style: italic;
}

.request-actions {
    display: flex;
    gap: 8px;
}

.btn-approve {
    background-color: #22c55e;
}

.btn-approve:hover {
    background-color: #16a34a;
}

.btn-reject {
    background-color: #ef4444;
}

.btn-reject:hover {
    background-color: #dc2626;
}

.btn-danger {
    background-color: #ef4444;
}

.btn-danger:hover {
    background-color: #dc2626;
}

#join-club-container {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid rgba(0,0,0,0.1);
}

/* ===== New Layout Styles ===== */
.header-back-btn {
    background: none;
    border: none;
    color: var(--tg-theme-link-color);
    font-size: 16px;
    cursor: pointer;
    padding: 8px;
}

.fixed-bottom-actions {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px;
    background: var(--tg-theme-bg-color);
    border-top: 1px solid rgba(0,0,0,0.1);
    display: flex;
    gap: 8px;
    z-index: 100;
}

.fixed-bottom-actions .btn {
    flex: 1;
}

.content {
    padding-bottom: 80px; /* Space for fixed bottom actions */
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}