:root {
    --primary-color: #3b82f6;
    --primary-color-rgb: 59, 130, 246;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --secondary-color: #10b981;
    --secondary-dark: #059669;
    --secondary-light: #34d399;
    --accent-color: #f97316;
    --accent-dark: #ea580c;
    --accent-light: #fb923c;
    --success-color: #22c55e;
    --warning-color: #eab308;
    --error-color: #ef4444;
    --background-light: #f8fafc;
    --text-light: #1e293b;
    --card-light: #ffffff;
    --border-light: #e2e8f0;
    --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --header-height: 70px;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #10b981;
    --secondary-dark: #059669;
    --secondary-light: #34d399;
    --accent-color: #f97316;
    --accent-dark: #ea580c;
    --accent-light: #fb923c;
    --success-color: #22c55e;
    --warning-color: #eab308;
    --error-color: #ef4444;
    --background-light: #0f172a;
    --text-light: #f1f5f9;
    --card-light: #1e293b;
    --border-light: #334155;
    --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Cairo', sans-serif;
}

body {
    background-color: var(--background-light);
    color: var(--text-light);
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: var(--header-height);
    background-image: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(16, 185, 129, 0.05) 100%);
    background-attachment: fixed;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
    position: relative;
    z-index: 1;
}

/* Header Styles */
#main-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    padding: 0.5rem 0;
    box-shadow: var(--shadow-light);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
}

.header-content > div {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.header-title {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    font-family: 'Cairo', sans-serif;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    width: auto;
    transition: transform var(--transition-speed) ease;
}

.logo:hover img {
    transform: scale(1.05);
}

/* Side Menu Styles */
.menu-toggle {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
    transition: transform var(--transition-speed) ease;
}

.menu-toggle:hover {
    transform: scale(1.1);
}

.side-menu {
    position: fixed;
    right: -100%;
    top: 0;
    width: 300px;
    height: 100vh;
    background-color: var(--card-light);
    box-shadow: var(--shadow-light);
    transition: right var(--transition-speed) ease;
    z-index: 999;
    overflow-y: auto;
    padding: calc(var(--header-height) + 1rem) 1rem 1rem 1rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-left: 1px solid var(--border-light);
}

.side-menu.active {
    right: 0;
}

.menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-light);
}

.menu-items {
    list-style: none;
}

.menu-item {
    margin-bottom: 1rem;
}

.menu-link {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    color: var(--text-light);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
    border-radius: 0.5rem;
}

.menu-link:hover {
    background-color: var(--border-light);
    transform: translateX(-5px);
}

.menu-link i {
    margin-left: 0.75rem;
    width: 20px;
    text-align: center;
}

.submenu {
    list-style: none;
    margin-right: 2rem;
    margin-top: 0.5rem;
    display: none;
}

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

.menu-close {
    background: var(--primary-color);
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed) ease;
    padding: 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.menu-close:hover {
    background-color: var(--primary-dark);
    transform: scale(1.1);
}

/* App Specific Styles */
.app-header {
display: flex
;
justify-content: center;
margin-bottom: 2rem;
flex-direction: row;
align-items: baseline;
}

.app-title {
    font-size: 2rem;
    color: var(--primary-color);
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    transition: transform var(--transition-speed) ease;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: rotate(15deg) scale(1.1);
    background-color: var(--border-light);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.card {
    background-color: var(--card-light);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border-radius: 5px 5px 0 0;
}

.exercise-card::before {
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
}

.food-card::before {
    background: linear-gradient(to right, var(--secondary-color), var(--primary-color));
}

.calculator-card::before {
    background: linear-gradient(to right, var(--accent-color), var(--secondary-color));
}

.backup-card::before {
    background: linear-gradient(to right, var(--primary-dark), var(--secondary-dark));
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.summary-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1.5rem;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
}

.summary-card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
    opacity: 0.6;
    pointer-events: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.stat-item {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    transition: transform var(--transition-speed) ease;
}

.stat-item:hover {
    transform: translateY(-3px);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* Notification */
.notification {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    background-color: var(--primary-color);
    color: white;
    display: none;
    z-index: 1000;
    box-shadow: var(--shadow-light);
    animation: slideIn 0.3s ease;
    max-width: 300px;
}

/* Footer */
#main-footer {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: white;
    padding: 1rem;
    text-align: center;
    margin-top: auto;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--card-light);
    padding: 2rem;
    border-radius: 1rem;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-hover);
    animation: fadeIn 0.3s ease;
    border: 1px solid var(--border-light);
}

.close {
    float: left;
    cursor: pointer;
    font-size: 1.5rem;
    transition: transform var(--transition-speed) ease;
}

.close:hover {
    transform: rotate(90deg);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Media Queries */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .container {
        padding: 1rem;
    }

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

    .side-menu {
        width: 85%;
        max-width: 300px;
    }

    .stat-item {
        padding: 0.75rem;
    }

    .app-title {
        font-size: 1.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

@media print {
    .no-print, .side-menu, #main-header, #main-footer, .theme-toggle, .notification {
        display: none !important;
    }

    .container {
        padding: 0;
    }

    body {
        padding-top: 0;
        background: none;
    }
}

/* Forms and Inputs */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    background-color: var(--card-light);
    color: var(--text-light);
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    margin: 0.25rem;
}

.primary-button {
    background-color: var(--primary-color);
    color: white;
}

.primary-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.secondary-button {
    background-color: var(--secondary-color);
    color: white;
}

.secondary-button:hover {
    background-color: var(--secondary-dark);
    transform: translateY(-2px);
}

.accent-button {
    background-color: var(--accent-color);
    color: white;
}

.accent-button:hover {
    background-color: var(--accent-dark);
    transform: translateY(-2px);
}

.text-button {
    background: transparent;
    color: var(--text-light);
    padding: 0.5rem;
}

.text-button:hover {
    background-color: var(--border-light);
}

/* Lists */
.exercise-list, .food-list {
    list-style: none;
    margin-top: 1rem;
}

.exercise-item, .food-item {
    padding: 1rem;
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-speed) ease;
    background-color: rgba(255, 255, 255, 0.03);
}

.exercise-item:hover, .food-item:hover {
    transform: translateX(-5px);
    border-color: var(--primary-color);
}

.category-tag {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    background-color: var(--primary-color);
    color: white;
    font-size: 0.875rem;
    margin: 0.25rem;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 0.75rem;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 0.25rem;
    margin-top: 0.5rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(to right, var(--secondary-light), var(--secondary-color));
    border-radius: 0.25rem;
    transition: width var(--transition-speed) ease;
}

/* Checkbox items */
.checkbox-item {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background-color var(--transition-speed) ease;
}

.checkbox-item:hover {
    background-color: var(--border-light);
}

.checkbox-item input[type="checkbox"] {
    width: auto;
    margin-left: 0.5rem;
}