/* Reset and Base Styles */
* {
    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, #ffffff);
    color: var(--tg-theme-text-color, #000000);
    line-height: 1.6;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.user-info {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Timer Controls */
.timer-controls {
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.timer-buttons {
    display: flex;
    gap: 8px;
}

.timer-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.3s ease;
}

.timer-btn:hover { transform: translateY(-1px); }
.timer-btn:active { transform: translateY(0); }

.timer-display {
    min-width: 72px;
    padding: 6px 10px;
    border-radius: 18px;
    background: rgba(0,0,0,0.2);
    color: #fff;
    font-variant-numeric: tabular-nums;
}

/* Tabs */
.tab-switcher {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
    padding: 12px 20px 0 20px;
    display: flex;
    gap: 12px;
}

.tab-btn {
    flex: 1;
    border-radius: 12px;
    border: 2px solid var(--tg-theme-hint-color, #e9ecef);
    background: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #444);
    padding: 10px 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn.active {
    border-color: transparent;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 0 6px 18px rgba(102, 126, 234, 0.3);
}

/* Main Content */
.app-main {
    flex: 1;
    padding: 20px;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* Screens */
.screen {
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Cards */
.card {
    background: var(--tg-theme-secondary-bg-color, #f8f9fa);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    border: 1px solid var(--tg-theme-hint-color, #e9ecef);
}

.card h2, .card h3 {
    margin-bottom: 16px;
    color: var(--tg-theme-text-color, #333);
}

/* Form Styles */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--tg-theme-text-color, #555);
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--tg-theme-hint-color, #e9ecef);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: var(--tg-theme-bg-color, #ffffff);
    color: var(--tg-theme-text-color, #000);
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--tg-theme-button-color, #667eea);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-group textarea {
    resize: vertical;
    min-height: 80px;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
}

/* Buttons */
.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 16px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

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

.btn-back {
    background: var(--tg-theme-secondary-bg-color, #f8f9fa);
    border: 1px solid var(--tg-theme-hint-color, #e9ecef);
    color: var(--tg-theme-text-color, #333);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-back:hover {
    background: var(--tg-theme-hint-color, #e9ecef);
}

/* Search */
.search-container {
    margin-bottom: 20px;
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-input {
    width: 100%;
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--tg-theme-hint-color, #e9ecef);
    border-radius: 12px;
    font-size: 16px;
    background: var(--tg-theme-bg-color, #ffffff);
    color: var(--tg-theme-text-color, #000);
}

.add-exercise-btn {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    border: none;
    background: linear-gradient(135deg, #42e695 0%, #3bb2b8 100%);
    color: #fff;
    font-size: 1.6rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.add-exercise-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 178, 184, 0.4);
}

.add-exercise-card {
    margin-bottom: 20px;
}

.add-exercise-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.icon-button {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--tg-theme-hint-color, #666);
    padding: 4px 8px;
    border-radius: 8px;
}

.icon-button:hover {
    background: var(--tg-theme-hint-color, rgba(0,0,0,0.05));
}

.button-row {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 12px;
}

.btn-secondary {
    flex: 1;
    border: 2px solid var(--tg-theme-hint-color, #e9ecef);
    background: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #333);
    padding: 14px 18px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: var(--tg-theme-hint-color, #e9ecef);
}

.form-submit-btn {
    width: auto;
    flex: 1;
}

/* Exercise Grid */
.exercise-grid {
    display: grid;
    gap: 12px;
}

.exercise-item {
    background: var(--tg-theme-secondary-bg-color, #f8f9fa);
    border: 1px solid var(--tg-theme-hint-color, #e9ecef);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exercise-item:hover {
    background: var(--tg-theme-hint-color, #e9ecef);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.exercise-info h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--tg-theme-text-color, #333);
}

.exercise-info p {
    margin: 4px 0 0 0;
    font-size: 0.9rem;
    color: var(--tg-theme-hint-color, #666);
}

.exercise-arrow {
    font-size: 1.2rem;
    color: var(--tg-theme-hint-color, #ccc);
}

/* Exercise Detail Header */
.exercise-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.exercise-header h2 {
    flex: 1;
    margin: 0;
    font-size: 1.3rem;
}

/* Plan Screen */
.plan-info-card {
    background: linear-gradient(135deg, rgba(118, 75, 162, 0.08), rgba(102, 126, 234, 0.08));
}

.plan-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.plan-empty-state {
    text-align: center;
}

.plan-empty-state h3 {
    margin-bottom: 8px;
}

.plan-day-card {
    background: var(--tg-theme-secondary-bg-color, #f8f9fa);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--tg-theme-hint-color, #e9ecef);
}

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

.plan-day-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--tg-theme-text-color, #222);
}

.plan-day-count {
    font-size: 0.9rem;
    color: var(--tg-theme-hint-color, #666);
}

.plan-day-empty {
    color: var(--tg-theme-hint-color, #888);
    font-size: 0.95rem;
}

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

.plan-exercise-item {
    padding: 12px;
    border-radius: 10px;
    background: var(--tg-theme-bg-color, #fff);
    border: 1px solid var(--tg-theme-hint-color, #e0e0e0);
    cursor: pointer;
    transition: all 0.2s ease;
}

.plan-exercise-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.plan-exercise-item.completed {
    border-color: rgba(46, 204, 113, 0.6);
    box-shadow: 0 4px 14px rgba(46, 204, 113, 0.15);
}

.plan-exercise-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.plan-exercise-muscle {
    font-size: 0.85rem;
    color: var(--tg-theme-hint-color, #777);
}

/* Plan tags */
.plan-tags-card {
    margin-bottom: 16px;
}

.plan-tags-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
}

.plan-tags-hint {
    font-size: 0.9rem;
    color: var(--tg-theme-hint-color, #666);
    margin-bottom: 12px;
}

.plan-tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.plan-tag-list[data-open="false"] {
    display: none;
}

.plan-tag {
    border: 1px dashed var(--tg-theme-hint-color, #c7c7c7);
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--tg-theme-bg-color, #fff);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.plan-tag:hover {
    border-style: solid;
    border-color: var(--tg-theme-button-color, #667eea);
}

.plan-tag.selected {
    background: rgba(102, 126, 234, 0.15);
    border: 1px solid rgba(102, 126, 234, 0.3);
    color: var(--tg-theme-button-text-color, #1b1b1b);
}

.plan-tag-remove {
    font-weight: 700;
    color: inherit;
}


/* History */
.history-container {
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    background: var(--tg-theme-bg-color, #ffffff);
    border: 1px solid var(--tg-theme-hint-color, #e9ecef);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
}

.history-row {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 8px;
}

.history-delete {
    border: none;
    background: #dc3545;
    color: #fff;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    flex: 0 0 auto;
}

.history-delete:hover { filter: brightness(0.95); }
.history-delete:active { filter: brightness(0.9); }

.history-date {
    font-weight: 600;
    color: var(--tg-theme-text-color, #333);
    margin-bottom: 4px;
}

.history-stats {
    display: flex;
    gap: 16px;
    font-size: 0.9rem;
    color: var(--tg-theme-hint-color, #666);
}

.history-comment {
    margin-top: 8px;
    font-style: italic;
    color: var(--tg-theme-hint-color, #666);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    color: white;
    font-size: 1.1rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #28a745;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    z-index: 1001;
    transition: all 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    background: #dc3545;
}

/* Responsive Design */
@media (max-width: 480px) {
    .app-main {
        padding: 16px;
    }
    
    .card {
        padding: 20px;
    }
    
    .input-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .exercise-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
    .card {
        background: var(--tg-theme-secondary-bg-color, #1a1a1a);
        border-color: var(--tg-theme-hint-color, #333);
    }
    
    .exercise-item {
        background: var(--tg-theme-secondary-bg-color, #1a1a1a);
        border-color: var(--tg-theme-hint-color, #333);
    }
    
    .history-item {
        background: var(--tg-theme-bg-color, #000);
        border-color: var(--tg-theme-hint-color, #333);
    }
}