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

: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;
    
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", 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;
}

.app-container {
    max-width: 100%;
    min-height: 100vh;
    padding-bottom: 80px;
}

/* Loading Screen */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Header */
.header {
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    border-radius: 0 0 30px 30px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-lg);
}

.header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.welcome-text {
    font-size: 16px;
    opacity: 0.9;
}

.back-btn {
    position: absolute;
    left: 20px;
    top: 20px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Stats */
.stats-container {
    padding: 0 20px;
    margin-bottom: 30px;
}

.stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.stats-header h2 {
    font-size: 20px;
    color: var(--tg-theme-text-color);
    margin: 0;
}

.stats-period-toggle {
    display: flex;
    background: var(--tg-theme-secondary-bg-color);
    border-radius: 12px;
    padding: 4px;
    gap: 4px;
}

.period-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--tg-theme-hint-color);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.period-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(99, 102, 241, 0.3);
}

.period-btn:hover:not(.active) {
    color: var(--tg-theme-text-color);
}

.stats-container h2 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--tg-theme-text-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.stat-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--tg-theme-hint-color);
}

/* Exercises */
.exercises-container {
    padding: 0 20px;
    margin-bottom: 30px;
}

.exercises-container h2 {
    font-size: 20px;
    margin-bottom: 15px;
}

.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 15px;
}

.exercise-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.exercise-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.exercise-card:active {
    transform: translateY(-2px) scale(0.98);
}

.exercise-icon {
    font-size: 48px;
    margin-bottom: 10px;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.2));
}

.exercise-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
}

.exercise-unit {
    font-size: 13px;
    opacity: 0.9;
}

/* Exercise Input */
.exercise-input-container {
    padding: 30px 20px;
    text-align: center;
}

.exercise-icon-large {
    font-size: 80px;
    margin-bottom: 30px;
    filter: drop-shadow(4px 4px 8px rgba(0,0,0,0.2));
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.input-section {
    margin: 30px 0;
}

.input-label {
    display: block;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--tg-theme-text-color);
}

.exercise-input {
    width: 100%;
    max-width: 300px;
    padding: 15px 20px;
    font-size: 24px;
    text-align: center;
    border: 2px solid var(--primary-color);
    border-radius: 15px;
    outline: none;
    transition: all 0.3s;
}

.exercise-input:focus {
    border-color: var(--primary-hover);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Counter */
.counter-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.counter-btn {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.counter-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.1);
}

.counter-btn:active {
    transform: scale(0.95);
}

.counter-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

#counter-value {
    width: 120px;
    padding: 15px;
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    border: 3px solid var(--primary-color);
    border-radius: 15px;
    outline: none;
    color: var(--primary-color);
}

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

.submit-btn {
    width: 100%;
    max-width: 300px;
    padding: 18px 30px;
    margin-top: 30px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: 15px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:active {
    transform: translateY(0);
}

/* Leaderboard */
.leaderboard-tabs {
    display: flex;
    overflow-x: auto;
    padding: 0 20px;
    gap: 10px;
    margin-bottom: 20px;
    scrollbar-width: none;
}

.leaderboard-tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    flex: 0 0 auto;
    padding: 12px 20px;
    background: var(--card-bg);
    border: 2px solid transparent;
    border-radius: 25px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
    box-shadow: var(--shadow);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.leaderboard-content {
    padding: 0 20px;
    margin-bottom: 20px;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    margin-bottom: 12px;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.leaderboard-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.rank {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

.rank-1 { background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%); }
.rank-2 { background: linear-gradient(135deg, #c0c0c0 0%, #e8e8e8 100%); }
.rank-3 { background: linear-gradient(135deg, #cd7f32 0%, #daa520 100%); }
.rank-other { background: var(--tg-theme-secondary-bg-color); color: var(--tg-theme-hint-color); }

.user-info {
    flex: 1;
}

.user-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}

.user-stats-small {
    font-size: 13px;
    color: var(--tg-theme-hint-color);
}

.user-score {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

/* Admin Panel */
.admin-container {
    padding: 0 20px;
}

.admin-container h2 {
    font-size: 20px;
    margin-bottom: 15px;
}

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

.user-item {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.user-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.user-item-name {
    font-size: 16px;
    font-weight: 600;
}

.user-item-id {
    font-size: 13px;
    color: var(--tg-theme-hint-color);
}

.user-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.action-btn {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.action-btn-danger {
    background: var(--danger-color);
    color: white;
}

.action-btn-warning {
    background: var(--warning-color);
    color: white;
}

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

/* Navigation */
.navigation {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    background: var(--card-bg);
    padding: 10px 20px;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
    border-radius: 20px 20px 0 0;
    z-index: 100;
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 10px;
    background: transparent;
    border: none;
    color: var(--tg-theme-hint-color);
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 10px;
}

.nav-btn.active {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.nav-icon {
    font-size: 24px;
}

.nav-label {
    font-size: 11px;
    font-weight: 600;
}

/* Utilities */
.screen {
    animation: fadeIn 0.3s;
}

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

/* Responsive */
@media (max-width: 480px) {
    .exercises-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Toast notifications */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 15px 25px;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    z-index: 1000;
    animation: slideDown 0.3s, slideUp 0.3s 2.7s;
}

@keyframes slideDown {
    from { transform: translate(-50%, -100%); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

@keyframes slideUp {
    from { transform: translate(-50%, 0); opacity: 1; }
    to { transform: translate(-50%, -100%); opacity: 0; }
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}