/* Base Variables and Reset */
:root {
    /* Primary Colors */
    --primary-color: #2196F3;
    --primary-light: #BBDEFB;
    --primary-dark: #1976D2;
    
    /* Secondary Colors */
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --accent-color: #9C27B0;
    
    /* Neutral Colors */
    --light-bg: #F5F7FA;
    --dark-bg: #1F2937;
    --light-text: #F9FAFB;
    --dark-text: #1F2937;
    --border-color: #E5E7EB;
    --card-bg: #FFFFFF;
    --card-shadow: rgba(0, 0, 0, 0.1);
    
    /* Risk Zone Colors */
    --normal-zone: #4CAF50;
    --elevated-zone: #FFC107;
    --high-zone: #F44336;
    --crisis-zone: #9C27B0;
    
    /* Chart Colors */
    --systolic-color: #F44336;
    --diastolic-color: #2196F3;
    --pulse-color: #9C27B0;
    
    /* UI Elements */
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

/* Dark Theme Variables */
.dark-theme {
    --light-bg: #1F2937;
    --dark-bg: #111827;
    --light-text: #F9FAFB;
    --dark-text: #F9FAFB;
    --border-color: #374151;
    --card-bg: #1F2937;
    --card-shadow: rgba(0, 0, 0, 0.3);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--light-bg);
    color: var(--dark-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-xl);
}

h2 {
    font-size: var(--font-size-lg);
}

h3 {
    font-size: var(--font-size-md);
}

p {
    margin-bottom: var(--spacing-md);
}

/* Layout */
header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: var(--spacing-md);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.logo i {
    font-size: 1.8rem;
}

.fa-heartbeat {
    color: var(--danger-color);
    font-size: 1.2rem;
    margin-bottom: 16px;
}
.item{
    padding: 0.9rem;
   margin-right: 0.5rem;
   
}
.sp-icon{
    margin-right: 0.5rem;
    font-size: 2.5rem;
}

nav {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--light-text);
    opacity: 0.8;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    transition: opacity var(--transition-speed);
}

.nav-btn i {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.nav-btn span {
    font-size: var(--font-size-sm);
}

.nav-btn.active {
    opacity: 1;
    font-weight: 600;
}

.nav-btn:hover {
    opacity: 1;
}

main {
    flex: 1;
    padding: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

footer {
    background-color: var(--dark-bg);
    color: var(--light-text);
    text-align: center;
    padding: var(--spacing-md);
    margin-top: auto;
}

footer a {
    color: var(--primary-light);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Screens */
.screen {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.screen.active {
    display: block;
}

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

/* Dashboard Screen */
.dashboard-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.last-reading, .status-indicator, .mini-chart {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
}

.reading-data {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.reading-value {
    font-size: 2rem;
    font-weight: bold;
    margin: var(--spacing-md) 0;
}

.reading-meta {
    display: flex;
    justify-content: space-between;
    width: 100%;
    color: #666;
    font-size: var(--font-size-sm);
}

.status-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.status-circle {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: #ccc;
}

.status-circle.normal {
    background-color: var(--normal-zone);
}

.status-circle.elevated {
    background-color: var(--elevated-zone);
}

.status-circle.high {
    background-color: var(--high-zone);
}

.status-circle.crisis {
    background-color: var(--crisis-zone);
}

.status-text {
    font-weight: 600;
    margin: 0;
}

.mini-chart-container {
    height: 150px;
    position: relative;
}

.dashboard-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

/* New Measurement Screen */
.form-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--card-bg);
    color: var(--dark-text);
    transition: border-color var(--transition-speed);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-hint {
    font-size: var(--font-size-sm);
    color: #666;
    margin-top: var(--spacing-xs);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* History Screen */
.history-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.history-filters {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.date-range-filter {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.date-range-filter input {
    max-width: 150px;
}

.history-list {
    max-height: 500px;
    overflow-y: auto;
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-md);
}

.history-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.history-date {
    font-weight: 600;
}

.history-values {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.history-value {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.history-value.normal {
    color: var(--normal-zone);
}

.history-value.elevated {
    color: var(--elevated-zone);
}

.history-value.high {
    color: var(--high-zone);
}

.history-value.crisis {
    color: var(--crisis-zone);
}

.history-notes {
    font-size: var(--font-size-sm);
    color: #666;
    margin-top: var(--spacing-sm);
}

/* Charts Screen */
.charts-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
}

.chart-filters {
    margin-bottom: var(--spacing-lg);
}

.chart-wrapper {
    position: relative;
    height: 300px;
    margin-bottom: var(--spacing-lg);
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.legend-color {
    width: 20px;
    height: 10px;
    border-radius: 3px;
}

.legend-color.systolic {
    background-color: var(--systolic-color);
}

.legend-color.diastolic {
    background-color: var(--diastolic-color);
}

.legend-color.pulse {
    background-color: var(--pulse-color);
}

.risk-zones-legend {
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-md);
}

.risk-zones {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
}

.risk-zone {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.zone-color {
    width: 20px;
    height: 10px;
    border-radius: 3px;
}

.zone-color.normal {
    background-color: var(--normal-zone);
}

.zone-color.elevated {
    background-color: var(--elevated-zone);
}

.zone-color.high {
    background-color: var(--high-zone);
}

.zone-color.crisis {
    background-color: var(--crisis-zone);
}

/* Settings Screen */
.settings-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
}

.settings-group {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.settings-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.setting-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
}

.btn:hover {
    transform: translateY(-2px);
}

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

.primary-btn {
    background-color: var(--primary-color);
    color: var(--light-text);
}

.primary-btn:hover {
    background-color: var(--primary-dark);
}

.secondary-btn {
    background-color: var(--light-bg);
    color: var(--dark-text);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    background-color: #E5E7EB;
}

.danger-btn {
    background-color: var(--danger-color);
    color: var(--light-text);
}

.danger-btn:hover {
    background-color: #D32F2F;
}

.small-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* Alerts */
.alert-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 350px;
}

.alert {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: flex-start;
    animation: slideIn 0.3s ease-out;
}

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

.alert.success {
    border-left: 4px solid var(--success-color);
}

.alert.warning {
    border-left: 4px solid var(--warning-color);
}

.alert.danger {
    border-left: 4px solid var(--danger-color);
}

.alert-icon {
    margin-right: var(--spacing-md);
    font-size: 1.25rem;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.alert-close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    color: #666;
    margin-left: var(--spacing-sm);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--box-shadow);
    animation: zoomIn 0.3s ease-out;
}

@keyframes zoomIn {
    from { transform: scale(0.9); }
    to { transform: scale(1); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header.danger {
    background-color: var(--danger-color);
    color: var(--light-text);
}

.modal-header.warning {
    background-color: var(--warning-color);
    color: var(--dark-text);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

.risk-values {
    display: flex;
    justify-content: space-around;
    margin: var(--spacing-lg) 0;
}

.risk-value {
    text-align: center;
}

.risk-value .label {
    display: block;
    font-size: var(--font-size-sm);
    color: #666;
}

.risk-value .value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--danger-color);
}

.risk-advice {
    background-color: #FFF3E0;
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* No Data Message */
.no-data-message {
    text-align: center;
    padding: var(--spacing-lg);
    color: #666;
}

.mini-chart-no-data, .chart-no-data {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.9);
}

/* Responsive Design */
@media (min-width: 768px) {
    header {
        flex-direction: row;
        justify-content: space-between;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .logo {
        margin-bottom: 0;
    }
    
    nav {
        width: auto;
    }
    
    .dashboard-container {
        grid-template-columns: 1fr 1fr;
    }
    
    .last-reading {
        grid-column: span 2;
    }
    
    .dashboard-actions {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .form-actions {
        justify-content: flex-end;
    }
    
    .setting-actions {
        flex-direction: row;
    }
}

@media (max-width: 480px) {
    .nav-btn span {
        font-size: 0.7rem;
    }
    
    .history-item-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .history-values {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .chart-legend, .risk-zones {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}