/* Modern Design System & CSS Reset */
:root {
    --bg-base: #070a13;
    --bg-surface: rgba(18, 26, 47, 0.6);
    --bg-surface-hover: rgba(26, 37, 65, 0.8);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-active: rgba(0, 242, 254, 0.3);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Device Colors */
    --dev-1-color: #ff3b30; /* iOS System Red */
    --dev-1-gradient: linear-gradient(135deg, #ff453a 0%, #ff3b30 100%);
    --dev-2-color: #007aff; /* iOS System Blue */
    --dev-2-gradient: linear-gradient(135deg, #0a84ff 0%, #007aff 100%);
    
    --status-online: #00e676;
    --status-offline: #ff1744;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Outfit', var(--font-sans);
    
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    padding: 1rem;
    overflow-x: hidden;
    line-height: 1.5;
}

/* App Container */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-height: calc(100vh - 2rem);
}

/* Header */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    gap: 1rem;
    flex-wrap: wrap;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2.25rem;
    background: linear-gradient(135deg, var(--dev-1-color) 0%, var(--dev-2-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.logo-text h1 sub {
    font-size: 0.65em;
    bottom: -0.1em;
}

.logo-text .subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.controls-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Segmented Control for Timezone Toggle */
.toggle-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toggle-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.segmented-control {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    padding: 2px;
    border-radius: 8px;
}

.control-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition-smooth);
}

.control-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.control-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* Action Button */
.action-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-1px);
}

.action-btn:active {
    transform: translateY(1px);
}

/* Main Card & Unified Layout */
.main-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    border-top: 4px solid #a855f7; /* Purple comparison theme */
}

.main-card:hover {
    background: var(--bg-surface-hover);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
}

.summary-section {
    display: grid;
    grid-template-columns: 1fr 280px 1fr;
    gap: 1.5rem;
    align-items: center;
}

.sensor-summary {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sensor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.device-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

#sensor-summary-1 .device-title {
    border-left: 3px solid var(--dev-1-color);
    padding-left: 0.5rem;
}

#sensor-summary-2 .device-title {
    border-left: 3px solid var(--dev-2-color);
    padding-left: 0.5rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.selector-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
}

.dev-icon {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

#sensor-summary-1 .dev-icon { color: var(--dev-1-color); }
#sensor-summary-2 .dev-icon { color: var(--dev-2-color); }

.device-select {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    border-radius: 10px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    max-width: 260px;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.25rem;
    transition: var(--transition-smooth);
}

.device-select:focus {
    outline: none;
    border-color: var(--text-secondary);
}

.device-status {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.status-dot.online {
    background-color: var(--status-online);
    box-shadow: 0 0 8px var(--status-online);
}

.status-dot.offline {
    background-color: var(--status-offline);
    box-shadow: 0 0 8px var(--status-offline);
}

.status-text {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* KPI Cards Layout */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.kpi-card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

.kpi-card:hover {
    background: rgba(255, 255, 255, 0.02);
}

.kpi-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.kpi-title {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.kpi-title sub {
    font-size: 0.7em;
}

.kpi-icon {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.kpi-value-container {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
}

.kpi-value {
    font-family: var(--font-display);
    font-size: 1.85rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

#sensor-summary-1 .kpi-card:first-child .kpi-value { color: var(--dev-1-color); }
#sensor-summary-2 .kpi-card:first-child .kpi-value { color: var(--dev-2-color); }

.kpi-unit {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Chart Wrapper */
.chart-wrapper {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1rem;
    position: relative;
    min-height: 380px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Loader Overlay */
.chart-overlay-loader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(7, 10, 19, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    border-radius: 16px;
    z-index: 10;
    transition: var(--transition-smooth);
    opacity: 0;
    pointer-events: none;
}

.chart-overlay-loader.active {
    opacity: 1;
    pointer-events: all;
}

.spinner {
    width: 2.5rem;
    height: 2.5rem;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid var(--dev-1-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

#loader-device-2 .spinner {
    border-top-color: var(--dev-2-color);
}

.loader-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Footer styling */
.dashboard-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.benchmark-info {
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

/* Animations */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Media Queries for Small Screens */
@media (max-width: 992px) {
    .summary-section {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 600px) {
    body {
        padding: 0.5rem;
    }
    
    .dashboard-header {
        padding: 0.75rem 1rem;
    }
    
    .logo-text h1 {
        font-size: 1.25rem;
    }
    
    .main-card {
        padding: 1rem;
    }
    
    .kpi-value {
        font-size: 1.5rem;
    }
    
    .chart-wrapper {
        min-height: 320px;
        padding: 0.5rem;
    }
    
    .dashboard-footer {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* Admin Page Layout */
.admin-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-base);
}

.admin-container {
    width: 100%;
    max-width: 440px;
    padding: 1.5rem;
}

.admin-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 2.25rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    border-top: 4px solid var(--dev-1-color);
}

.admin-card-header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.admin-card-header h2 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 750;
    letter-spacing: -0.01em;
}

.admin-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.admin-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.admin-form label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.40rem;
}

.admin-form label .material-symbols-outlined {
    font-size: 1.15rem;
    color: var(--text-muted);
}

.admin-form input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.admin-form input:focus {
    outline: none;
    border-color: var(--dev-1-color);
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.15);
}

.admin-form .input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.submit-btn {
    background: var(--dev-1-gradient);
    border: none;
    color: #ffffff;
    padding: 0.85rem;
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.25);
    transition: var(--transition-smooth);
    margin-top: 0.5rem;
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.submit-btn:active {
    transform: translateY(1px);
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    transition: var(--transition-smooth);
    margin-top: 0.25rem;
}

.back-link:hover {
    color: var(--text-primary);
}

/* Alert Boxes */
.alert-box {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 550;
    text-align: center;
    border: 1px solid transparent;
}

.alert-box.success {
    background: rgba(0, 230, 118, 0.1);
    border-color: rgba(0, 230, 118, 0.25);
    color: #00e676;
}

.alert-box.error {
    background: rgba(255, 23, 68, 0.1);
    border-color: rgba(255, 23, 68, 0.25);
    color: #ff1744;
}

.alert-box.hidden {
    display: none;
}

/* Landing / Error Overlay */
.landing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(7, 10, 19, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: var(--transition-smooth);
    padding: 1.5rem;
}

.landing-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.landing-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 3rem;
    max-width: 500px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--card-shadow);
    border-top: 4px solid var(--dev-2-color);
}

.landing-icon {
    font-size: 4.5rem;
    background: var(--dev-2-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.landing-card h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 750;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.landing-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.landing-card code {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.15rem 0.4rem;
    border-radius: 6px;
    font-family: monospace;
    color: var(--dev-1-color);
    font-size: 0.9em;
}

.landing-actions {
    margin-top: 0.5rem;
}

.demo-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--dev-2-gradient);
    color: #ffffff;
    padding: 0.85rem 1.75rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 4px 15px rgba(224, 64, 251, 0.25);
    transition: var(--transition-smooth);
}

.demo-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(224, 64, 251, 0.4);
}

.demo-btn:active {
    transform: translateY(1px);
}

/* Comparison Summary Panel */
.comparison-summary {
    background: rgba(16, 22, 42, 0.4);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px;
    padding: 1.25rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    text-align: center;
    border-top: 4px solid #a855f7; /* Purple accents for comparison ratio */
    align-self: stretch;
}

.comparison-summary:hover {
    background: rgba(22, 30, 58, 0.5);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
}

.ratio-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.ratio-header h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.ratio-icon {
    font-size: 1.25rem;
    color: #a855f7;
}

.ratio-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.ratio-number-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.ratio-value {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    color: var(--text-primary);
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, #f8fafc 30%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: var(--transition-smooth);
}

.ratio-value.reduction {
    background: linear-gradient(135deg, #f8fafc 30%, #00e676 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ratio-value.increase {
    background: linear-gradient(135deg, #f8fafc 30%, #ff1744 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ratio-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.5rem;
    font-weight: 500;
}

.ratio-badge-container {
    margin-top: 0.25rem;
}

.ratio-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: #c084fc;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 2px 10px rgba(168, 85, 247, 0.1);
}

.ratio-badge .material-symbols-outlined {
    font-size: 1rem;
}

.ratio-badge.increase-badge {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
    box-shadow: 0 2px 10px rgba(239, 68, 68, 0.1);
}