/* CSS Variables for Theming */
:root {
    --font-main: "Inter", sans-serif;

    /* Light Theme */
    --bg-light: #f1f5e6;
    --card-light: #cbd5e1;
    --text-light: #0f172a;
    --accent-light: #2dd4bf;
    --accent-hover-light: #23a391;
    --border-light: #94a3b8;
    --shadow-light: rgba(0, 0, 0, 0.1);

    /* Dark Theme */
    --bg-dark: #0f172a;
    --card-dark: #1e293b;
    --text-dark: #e2e8f0;
    --accent-dark: #2dd4bf;
    --accent-hover-dark: #5eead4;
    --border-dark: #475569;
    --shadow-dark: rgba(0, 0, 0, 0.4);

    /* Default to light theme */
    --bg-color: var(--bg-light);
    --card-color: var(--card-light);
    --text-color: var(--text-light);
    --accent-color: var(--accent-light);
    --accent-hover-color: var(--accent-hover-light);
    --border-color: var(--border-light);
    --shadow-color: var(--shadow-light);
}

html.dark {
    --bg-color: var(--bg-dark);
    --card-color: var(--card-dark);
    --text-color: var(--text-dark);
    --accent-color: var(--accent-dark);
    --accent-hover-color: var(--accent-hover-dark);
    --border-color: var(--border-dark);
    --shadow-color: var(--shadow-dark);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition:
        background-color 0.3s ease,
        color 0.3s ease;
    -webkit-tap-highlight-color: transparent;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.logo a {
    text-decoration: none;
    color: var(--text-color);
}

.date-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.25rem;
}

.date-nav button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}
.date-nav button:hover {
    background-color: var(--card-color);
}

#current-date {
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 8px;
    transition: background-color 0.2s;
}
#current-date:hover {
    background-color: var(--card-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle,
.learn-button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}
.theme-toggle:hover,
.learn-button:hover {
    background-color: var(--card-color);
}

.profile-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 2px 4px var(--shadow-color);
}
.profile-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Main Button */
.main-action-btn {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--accent-color);
    color: var(--bg-dark);
    border: none;
    padding: 1rem 2rem;
    border-radius: 9999px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition:
        background-color 0.2s,
        transform 0.2s;
    z-index: 10;
}

.main-action-btn:hover {
    background-color: var(--accent-hover-color);
    transform: translateX(-50%) scale(1.05);
}

/* Back Button */
.back-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    margin-bottom: 1.5rem;
    transition: background-color 0.2s;
    text-decoration: none;
}
.back-button:hover {
    background-color: var(--card-color);
}

/* Generic Card */
.card {
    background-color: var(--card-color);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: background-color 0.3s ease;
}

/* Workout History View */
.workout-group {
    margin-bottom: 1.5rem;
    cursor: pointer;
}

.workout-group .card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px var(--shadow-color);
}

.workout-group h3 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.workout-set {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}
.workout-set:last-child {
    border-bottom: none;
}
.set-data {
    display: flex;
    gap: 1.5rem;
}
.set-data span {
    font-weight: 500;
}
.set-notes {
    font-size: 0.875rem;
    color: var(--text-color);
    opacity: 0.7;
    margin-top: 0.25rem;
}

.no-workouts {
    text-align: center;
    padding: 4rem 1rem;
    opacity: 0.7;
}

/* Exercise Selection View */
.filter-controls {
    margin-bottom: 1.5rem;
}
.filter-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}
.search-container {
    position: relative;
    flex-grow: 1;
}
.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border-radius: 9999px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
}
.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.6;
}

.filter-toggle-btn {
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.muscle-group-filters {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 1rem;
    padding: 1rem;
    background-color: var(--card-color);
    border-radius: 16px;
}

.muscle-group-filters.visible {
    display: grid;
}

.muscle-group-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}
.muscle-group-btn img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    background-color: var(--bg-color);
    border-radius: 50%;
}
.muscle-group-btn span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-color);
}
.muscle-group-btn.selected {
    border-color: var(--accent-color);
    background-color: var(--bg-color);
}

.exercise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}
.exercise-card {
    background-color: var(--card-color);
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition:
        transform 0.2s,
        box-shadow 0.2s;
    box-shadow: 0 2px 4px var(--shadow-color);
    text-decoration: none;
}
.exercise-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 15px var(--shadow-color);
}
.exercise-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}
.exercise-card-info {
    padding: 1rem;
}
.exercise-card-info h4 {
    font-weight: 600;
}
.exercise-card-info p {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Workout Logging View & Detail Views */
.learn-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.logging-container,
.detail-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
@media (min-width: 768px) {
    .logging-container,
    .detail-container {
        grid-template-columns: 1fr 1fr;
    }
}
.exercise-info h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}
.exercise-info img {
    width: 100%;
    border-radius: 16px;
    margin-bottom: 1rem;
}

.equipment-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}
.equipment-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-color);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
}
.equipment-item img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    border-radius: 50%;
}

.form-card {
    padding: 1.5rem;
}
.form-fields {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group label {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
    opacity: 0.8;
}
.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    font-family: var(--font-main);
}

/* Custom duration input */
.duration-input {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
}
.duration-input input {
    width: 40px;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    font-family: var(--font-main);
    text-align: center;
    padding: 0;
}
.duration-input input:focus {
    outline: none;
}
.duration-input span {
    font-weight: 600;
}

.notes-group {
    grid-column: 1 / -1;
}
textarea {
    resize: vertical;
    min-height: 80px;
}
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.btn {
    flex-grow: 1;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}
.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-dark);
    text-decoration: none;
}
.btn-primary:hover {
    background-color: var(--accent-hover-color);
}
.btn-secondary {
    background-color: var(--card-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--bg-color);
}
.btn-danger {
    background-color: #ef4444;
    color: white;
}
.btn-danger:hover {
    background-color: #dc2626;
}
.btn-admin {
    background-color: #8b5cf6;
    color: white;
}

.day-sets-list h4 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}
.day-set-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 0.5rem;
    border: 2px solid transparent;
    transition: all 0.2s;
}
.day-set-item:hover {
    background-color: var(--bg-color);
}
.day-set-item.selected {
    border-color: var(--accent-color);
    background-color: var(--bg-color);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.3s,
        visibility 0.3s;
}
.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background-color: var(--bg-color);
    border-radius: 16px;
    padding: 2rem;
    max-width: 90%;
    width: 500px;
    box-shadow: 0 10px 25px var(--shadow-color);
    transform: scale(0.95);
    transition: transform 0.3s;
}
.modal-overlay.visible .modal-content {
    transform: scale(1);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.modal-header h3 {
    font-size: 1.25rem;
}
.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}
.modal-body {
    line-height: 1.6;
}

/* Profile Modal */
.profile-details {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}
.profile-details .profile-icon {
    width: 80px;
    height: 80px;
    font-size: 2rem;
}
.profile-details p {
    opacity: 0.7;
}
.logout-btn {
    margin-top: 1rem;
}

/* Video Modal */
#video-player {
    width: 100%;
    border-radius: 12px;
}

/* Utility */
.hidden {
    display: none !important;
}
.loading-spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 4rem auto;
}
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}