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

:root {
    /* Темная тема (по умолчанию) */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent-primary: #00d9ff;
    --accent-secondary: #b400ff;
    --success: #00ff88;
    --warning: #ffaa00;
    --error: #ff0066;
    --border: #333333;
    --shadow: rgba(0, 0, 0, 0.3);
    --nav-shadow: rgba(0, 217, 255, 0.4);
}

[data-theme="light"] {
    /* Светлая тема */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-card: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent-primary: #007AFF;
    --accent-secondary: #5856D6;
    --success: #34C759;
    --warning: #FF9500;
    --error: #FF3B30;
    --border: #e5e5e7;
    --shadow: rgba(0, 0, 0, 0.1);
    --nav-shadow: rgba(0, 122, 255, 0.2);
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-secondary);
    min-height: 100vh;
    position: relative;
    transition: background-color 0.3s;
}

.nav {
    display: flex;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 25px var(--nav-shadow);
}

.nav-button {
    flex: 1;
    padding: 15px;
    background: none;
    border: none;
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.nav-button.active {
    background: rgba(255, 255, 255, 0.15);
}

.nav-button:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: white;
    transition: all 0.3s;
    transform: translateX(-50%);
    box-shadow: 0 0 10px white;
}

.nav-button.active:after {
    width: 80%;
}

.logout-nav {
    flex: 0.5;
    font-size: 12px;
    min-width: 60px;
    transition: all 0.3s;
}

.logout-nav:hover {
    transform: scale(1.05);
}

/* Стили для переключателя тем */
.theme-toggle-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px 20px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    border-radius: 25px;
    padding: 8px 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
    font-size: 14px;
    color: var(--text-primary);
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--nav-shadow);
}

.theme-icon {
    font-size: 18px;
    transition: transform 0.3s;
}

.theme-toggle.active .theme-icon {
    transform: rotate(180deg);
}

.content {
    padding: 20px;
    display: none;
    animation: fadeIn 0.3s ease-in;
}

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

.content.active {
    display: block;
}

.title {
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 20px;
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(0, 217, 255, 0.3);
    transition: color 0.3s;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--text-primary);
    transition: color 0.3s;
}

.calendar {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
    transition: all 0.3s;
}

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

.calendar-nav {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.calendar-nav:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--nav-shadow);
}

.calendar-month {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.3s;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.calendar-day {
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    padding: 5px;
    font-weight: 500;
    transition: color 0.3s;
}

.calendar-date {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
    position: relative;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.calendar-date.has-workout {
    background: linear-gradient(135deg, var(--success), #00cc66);
    color: #0a0a0a;
    font-weight: bold;
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.4);
}

.calendar-date.today {
    border: 2px solid var(--accent-primary);
    background: var(--accent-primary);
    color: #0a0a0a;
    font-weight: bold;
    box-shadow: 0 0 15px var(--nav-shadow);
}

.calendar-date.other-month {
    color: var(--text-secondary);
    opacity: 0.5;
}

.calendar-date.selected {
    border: 3px solid var(--accent-primary) !important;
    background: var(--accent-primary) !important;
    color: #0a0a0a !important;
    font-weight: bold;
    transform: scale(1.1);
    box-shadow: 0 0 20px var(--nav-shadow);
}

.workout-history {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 15px;
    margin-top: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
    transition: all 0.3s;
}

.history-item {
    padding: 15px;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s;
    border-radius: 12px;
    margin-bottom: 8px;
    background: var(--bg-secondary);
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(5px);
    box-shadow: 0 0 15px var(--nav-shadow);
}

[data-theme="light"] .history-item:hover {
    background: rgba(0, 0, 0, 0.02);
}

.history-exercise {
    font-weight: 500;
    margin-bottom: 5px;
    cursor: pointer;
    transition: color 0.3s;
    font-size: 18px;
    color: var(--text-primary);
}

.history-exercise:hover {
    color: var(--accent-primary);
    text-shadow: 0 0 10px var(--nav-shadow);
}

.history-details {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.edit-button,
.delete-button {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.edit-button {
    background: linear-gradient(135deg, #ffaa00, #ffcc00);
    color: #0a0a0a;
    font-weight: 600;
}

.delete-button {
    background: linear-gradient(135deg, #ff0066, #ff3385);
    color: white;
}

.groups-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.group-button {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid var(--border);
    flex: 1 1 calc(50% - 10px);
    min-width: 140px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.group-button.selected {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #0a0a0a;
    transform: scale(1.05);
    box-shadow: 0 0 25px var(--nav-shadow);
    border-color: var(--accent-primary);
}

.exercise-button {
    background: var(--bg-card);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    text-align: left;
    color: var(--text-primary);
    font-size: 16px;
}

.exercise-button.selected {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #0a0a0a;
    border-color: var(--accent-primary);
    transform: scale(1.02);
    box-shadow: 0 0 20px var(--nav-shadow);
}

.set-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 10px;
    border: 1px solid var(--border);
    gap: 10px;
    flex-wrap: wrap;
}

.cardio-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 10px;
    border: 1px solid var(--border);
    gap: 10px;
    flex-wrap: wrap;
}

.variations-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.variation-checkbox {
    margin-right: 5px;
}

.variation-label {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--bg-card);
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s;
}

.variation-label:hover {
    background: rgba(255, 255, 255, 0.05);
}

.variation-label.selected {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #0a0a0a;
}

.set-inputs {
    display: flex;
    gap: 10px;
    flex: 1;
    min-width: 200px;
}

.cardio-inputs {
    display: flex;
    gap: 10px;
    flex: 1;
    min-width: 200px;
}

.weight-input,
.reps-input,
.time-input,
.intensity-input,
.body-weight-input {
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    width: 100%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s;
}

.add-button,
.save-button,
.auth-button {
    padding: 15px;
    border-radius: 12px;
    border: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    margin-bottom: 10px;
    transition: all 0.3s;
}

.add-button {
    background: linear-gradient(135deg, var(--success), #00cc66);
    color: #0a0a0a;
}

.save-button {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.auth-button {
    background: linear-gradient(135deg, #FFAA00, #FFCC00);
    color: #0a0a0a;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--accent-primary);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

.chart-container {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--success), #00cc66);
    color: #0a0a0a;
    padding: 15px 20px;
    border-radius: 12px;
    z-index: 1001;
    transform: translateX(150%);
    transition: transform 0.3s ease-out;
}

.notification.show {
    transform: translateX(0);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    transition: all 0.3s;
}

.modal-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    text-align: center;
    color: var(--text-primary);
    transition: color 0.3s;
}

.workout-set {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--border);
    transition: border-color 0.3s;
}

.close-modal {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 10px;
    cursor: pointer;
    width: 100%;
    margin-top: 15px;
    font-size: 16px;
}

.motivation-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
    text-align: center;
    transition: all 0.3s;
}

.motivation-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--accent-primary);
    text-shadow: 0 0 10px var(--nav-shadow);
    transition: color 0.3s;
}

.motivation-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 12px;
    margin: 10px 0;
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 20px var(--nav-shadow);
}

.motivation-text {
    font-size: 16px;
    color: var(--text-primary);
    margin: 15px 0;
    line-height: 1.5;
    transition: color 0.3s;
}

.motivation-quote {
    font-style: italic;
    color: var(--text-secondary);
    margin-top: 10px;
    font-size: 14px;
    transition: color 0.3s;
}

.backup-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s;
}

.backup-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--accent-primary);
    transition: color 0.3s;
}

.backup-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.export-button,
.import-button {
    padding: 12px 20px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    min-width: 150px;
}

.export-button {
    background: linear-gradient(135deg, #007AFF, #00d9ff);
    color: white;
}

.import-button {
    background: linear-gradient(135deg, var(--success), #00cc66);
    color: #0a0a0a;
}

.export-button:hover,
.import-button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--nav-shadow);
}

.file-input {
    display: none;
}

.auth-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s;
}

.auth-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--accent-primary);
    transition: color 0.3s;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.auth-input {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s;
}

.user-info {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s;
}

.user-email {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 10px;
    transition: color 0.3s;
}

.sync-status {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 10px;
    transition: color 0.3s;
}

.sync-status.syncing {
    color: var(--accent-primary);
}

.sync-status.synced {
    color: var(--success);
}

.sync-status.error {
    color: var(--error);
}

.forgot-password-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: color 0.3s;
    display: inline-block;
    margin-top: 10px;
}

.forgot-password-link:hover {
    color: var(--accent-secondary);
    text-shadow: 0 0 10px var(--nav-shadow);
}

.workout-date-display {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    text-align: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-primary);
    transition: all 0.3s;
}

.body-weight-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.body-weight-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    transition: color 0.3s;
}

.body-weight-input-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.body-weight-label {
    font-size: 14px;
    color: var(--text-secondary);
    min-width: 120px;
    transition: color 0.3s;
}

/* Стили для системы управления упражнениями */
.exercise-item {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.exercise-item:hover {
    transform: translateX(5px);
}

.archive-btn,
.unarchive-btn {
    transition: all 0.3s ease;
    min-width: 44px;
    border: none;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
}

.archive-btn {
    background: #666;
    color: white;
}

.archive-btn:hover {
    background: #888 !important;
    transform: scale(1.1);
}

.unarchive-btn {
    background: var(--success);
    color: white;
}

.unarchive-btn:hover {
    background: #00cc66 !important;
    transform: scale(1.1);
}

.search-input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 2px rgba(0, 217, 255, 0.2);
}

.toggle-archive-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.toggle-archive-btn:hover {
    background: var(--bg-secondary) !important;
    border-color: var(--accent-primary) !important;
}

.add-custom-exercise-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    margin-top: 15px;
    cursor: pointer;
    transition: all 0.3s;
}

.add-custom-exercise-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 0 15px var(--nav-shadow);
}

.archived-section {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
}

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

@media (max-width: 480px) {
    .container {
        max-width: 100%;
    }

    .nav-button {
        padding: 12px 8px;
        font-size: 12px;
    }

    .logout-nav {
        font-size: 10px;
        padding: 12px 5px;
        min-width: 50px;
    }

    .content {
        padding: 15px;
    }

    .set-inputs,
    .cardio-inputs {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .backup-buttons {
        flex-direction: column;
    }

    .export-button,
    .import-button {
        min-width: 100%;
    }

    .body-weight-input-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .body-weight-label {
        min-width: auto;
    }

    .theme-toggle {
        font-size: 12px;
        padding: 6px 12px;
    }

    .variations-container {
        flex-direction: column;
    }

    .exercise-item {
        flex-direction: column;
        gap: 10px;
    }

    .archive-btn,
    .unarchive-btn {
        width: 100%;
    }
}