/* ==========================================================================
   AERO SPEEDTEST - PREMIUM DESIGN SYSTEM
   ========================================================================== */

:root {
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    
    /* System Animations */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- THEME DEFINITIONS --- */
.dark-theme {
    --bg-primary: #030712; /* Deeper midnight black */
    --bg-secondary: rgba(17, 24, 39, 0.8);
    --card-bg: rgba(31, 41, 55, 0.35); /* Translucent cards */
    --card-bg-solid: #111827;
    --border-color: rgba(255, 255, 255, 0.05);
    --border-hover: rgba(255, 255, 255, 0.12);
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --accent-download: #06b6d4;      /* Electric Cyan */
    --accent-upload: #d946ef;        /* Neon Purple */
    --accent-ping: #f59e0b;          /* Bright Amber */
    
    --accent-download-rgb: 6, 182, 212;
    --accent-upload-rgb: 217, 70, 239;
    --accent-ping-rgb: 245, 158, 11;
    
    --shadow: rgba(0, 0, 0, 0.5);
    --shadow-glow: rgba(6, 182, 212, 0.25);
    --scrollbar-track: #030712;
    --scrollbar-thumb: #1f2937;
    --modal-overlay: rgba(3, 7, 18, 0.7);
    --bg-grid: rgba(255, 255, 255, 0.015);
}

.light-theme {
    --bg-primary: #f3f4f6; /* Soft light slate */
    --bg-secondary: rgba(243, 244, 246, 0.85);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-bg-solid: #ffffff;
    --border-color: rgba(17, 24, 39, 0.06);
    --border-hover: rgba(17, 24, 39, 0.12);
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    
    --accent-download: #0891b2;      /* Cyan Medium */
    --accent-upload: #c026d3;        /* Purple Medium */
    --accent-ping: #d97706;          /* Amber Medium */
    
    --accent-download-rgb: 8, 145, 178;
    --accent-upload-rgb: 192, 38, 211;
    --accent-ping-rgb: 217, 119, 6;
    
    --shadow: rgba(17, 24, 39, 0.05);
    --shadow-glow: rgba(8, 145, 178, 0.08);
    --scrollbar-track: #f9fafb;
    --scrollbar-thumb: #d1d5db;
    --modal-overlay: rgba(17, 24, 39, 0.4);
    --bg-grid: rgba(17, 24, 39, 0.015);
}

/* --- BASE STYLES --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    /* SaaS Grid Pattern Overlay */
    background-image: radial-gradient(var(--bg-grid) 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 99px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* --- BACKGROUND GLOWING ORBS --- */
.background-glows {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-1, .glow-2, .glow-3 {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    mix-blend-mode: screen;
    transition: opacity var(--transition-slow);
}

.dark-theme .glow-1, .dark-theme .glow-2, .dark-theme .glow-3 {
    opacity: 0.25;
}

.glow-1 {
    width: 45vw;
    height: 45vw;
    background: var(--accent-download);
    top: -15vw;
    left: -15vw;
    animation: float-slow 22s infinite alternate;
}

.glow-2 {
    width: 55vw;
    height: 55vw;
    background: var(--accent-upload);
    bottom: -20vw;
    right: -15vw;
    animation: float-slow 28s infinite alternate-reverse;
}

.glow-3 {
    width: 35vw;
    height: 35vw;
    background: var(--accent-ping);
    top: 35vh;
    left: 45vw;
    transform: translate(-50%, -50%);
    animation: pulse-slow 16s infinite ease-in-out;
}

@keyframes float-slow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(6vw, 5vw) scale(1.1); }
}

@keyframes pulse-slow {
    0%, 100% { opacity: 0.08; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.18; transform: translate(-50%, -50%) scale(1.15); }
}

/* --- GLASS CARD SYSTEM --- */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px) saturate(185%);
    -webkit-backdrop-filter: blur(20px) saturate(185%);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: 0 8px 32px 0 var(--shadow);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--border-hover);
}

/* --- HEADER DESIGN --- */
.app-header {
    width: 100%;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(var(--bg-primary), 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    cursor: default;
}

.brand-logo {
    width: 32px;
    height: 32px;
    color: var(--accent-download);
    animation: logo-sweep 6s infinite ease-in-out;
}

@keyframes logo-sweep {
    0%, 100% { transform: rotate(-5deg) scale(1); color: var(--accent-download); }
    50% { transform: rotate(10deg) scale(1.08); color: var(--accent-upload); }
}

.brand-name {
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    text-transform: uppercase;
}

.brand-suffix {
    color: var(--accent-download);
    font-weight: 300;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Icon Buttons */
.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.icon-btn:hover {
    background: var(--border-hover);
    border-color: var(--text-muted);
    transform: translateY(-2px);
}

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

.sun-icon { display: none; }
.moon-icon { display: block; }

.light-theme .sun-icon { display: block; }
.light-theme .moon-icon { display: none; }

/* --- MAIN LAYOUT --- */
.app-main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1.15fr 1.35fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .app-main {
        padding: 1.25rem 1rem;
    }
}

/* Panel Structure */
.panel {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

@media (max-width: 480px) {
    .panel {
        padding: 1.25rem 1rem;
    }
}

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

.panel-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.badge {
    background: var(--border-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: all var(--transition-normal);
}

/* Active states for status badge */
.badge.testing-ping {
    background: rgba(var(--accent-ping-rgb), 0.12);
    border-color: var(--accent-ping);
    color: var(--accent-ping);
    box-shadow: 0 0 10px rgba(var(--accent-ping-rgb), 0.2);
}

.badge.testing-download {
    background: rgba(var(--accent-download-rgb), 0.12);
    border-color: var(--accent-download);
    color: var(--accent-download);
    box-shadow: 0 0 10px rgba(var(--accent-download-rgb), 0.2);
}

.badge.testing-upload {
    background: rgba(var(--accent-upload-rgb), 0.12);
    border-color: var(--accent-upload);
    color: var(--accent-upload);
    box-shadow: 0 0 10px rgba(var(--accent-upload-rgb), 0.2);
}

.badge.completed {
    background: rgba(16, 185, 129, 0.12);
    border-color: #10b981;
    color: #10b981;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
}

/* --- SPEEDOMETER DIAL --- */
.speedometer-container {
    position: relative;
    width: 100%;
    max-width: 270px; /* Reduced slightly to fit mobile and tablet screens without clipping */
    margin: 1rem auto;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.speedometer-dial {
    width: 100%;
    height: 100%;
}

/* SVG elements */
.dial-ticks {
    stroke: var(--border-color);
    opacity: 0.5;
    transition: stroke var(--transition-normal);
}

.track-bg {
    transition: stroke var(--transition-normal);
}

.progress-active {
    transition: stroke-dashoffset 0.08s linear, stroke var(--transition-normal);
}

.progress-glow {
    transition: stroke-dashoffset 0.08s linear, stroke var(--transition-normal);
}

.progress-pointer-node {
    transition: cx 0.08s linear, cy 0.08s linear, fill var(--transition-normal), opacity var(--transition-normal);
}

/* Speedometer Text Details */
.speedometer-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 1rem;
    pointer-events: none;
}

.metric-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.speed-number {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -1.5px;
    font-variant-numeric: tabular-nums;
    background: linear-gradient(180deg, var(--text-primary) 30%, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.speed-label {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.progress-details {
    margin-top: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    width: 58%;
}

.progress-bar-mini-container {
    width: 100%;
    height: 3px;
    background: var(--border-color);
    border-radius: 99px;
    overflow: hidden;
}

.progress-bar-mini-fill {
    height: 100%;
    width: 0%;
    background: var(--text-muted);
    border-radius: 99px;
    transition: width 0.15s ease, background-color var(--transition-normal);
}

.status-subtext {
    font-size: 0.725rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
    height: 1.25rem;
}

/* --- BUTTONS & CONTROLS --- */
.control-actions {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-top: 0.25rem;
}

.btn {
    font-family: var(--font-primary);
    font-weight: 700;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent-download) 0%, #3b82f6 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px 0 rgba(6, 182, 212, 0.2);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(6, 182, 212, 0.35);
    filter: brightness(1.08);
}

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

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

.secondary-btn:hover {
    background: var(--border-hover);
    border-color: var(--text-muted);
}

.danger-btn {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.danger-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: #ef4444;
}

.small-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    border-radius: 10px;
}

.btn-full {
    width: 100%;
    padding: 0.825rem;
}

.btn-icon {
    width: 15px;
    height: 15px;
}

/* Special GO Button Style */
#start-test-btn {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    font-size: 1.125rem;
    letter-spacing: 0.5px;
    box-shadow: 0 6px 24px var(--shadow-glow);
}

#start-test-btn.aborting {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 6px 24px rgba(239, 68, 68, 0.3);
}

#start-test-btn.aborting:hover {
    box-shadow: 0 8px 30px rgba(239, 68, 68, 0.4);
}

.btn-glowing::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: inherit;
    border-radius: inherit;
    z-index: -1;
    opacity: 0.4;
    transition: transform 0.4s, opacity 0.4s;
}

.btn-glowing:hover::after {
    transform: scale(1.18);
    opacity: 0;
}

/* --- STATS & CHART --- */
.stats-and-chart-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Metrics Summary Grid */
.metrics-summary-card {
    padding: 1.25rem;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}

.metric-box {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.875rem 1rem;
    border-radius: 18px;
    background: rgba(120, 120, 120, 0.02);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.metric-box:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    background: rgba(120, 120, 120, 0.05);
}

.metric-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background-color var(--transition-normal);
}

.metric-icon svg {
    width: 20px;
    height: 20px;
}

/* Color Coding for metric boxes */
.ping-box .metric-icon {
    background: rgba(var(--accent-ping-rgb), 0.08);
    color: var(--accent-ping);
}
.ping-box:hover {
    box-shadow: 0 4px 15px rgba(var(--accent-ping-rgb), 0.08);
}

.jitter-box .metric-icon {
    background: rgba(var(--accent-ping-rgb), 0.06);
    color: var(--accent-ping);
    opacity: 0.85;
}
.jitter-box:hover {
    box-shadow: 0 4px 15px rgba(var(--accent-ping-rgb), 0.06);
}

.download-box .metric-icon {
    background: rgba(var(--accent-download-rgb), 0.08);
    color: var(--accent-download);
}
.download-box:hover {
    box-shadow: 0 4px 15px rgba(var(--accent-download-rgb), 0.08);
}

.upload-box .metric-icon {
    background: rgba(var(--accent-upload-rgb), 0.08);
    color: var(--accent-upload);
}
.upload-box:hover {
    box-shadow: 0 4px 15px rgba(var(--accent-upload-rgb), 0.08);
}

.metric-info {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
    flex: 1;
    overflow: hidden;
}

.metric-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-value-container {
    display: flex;
    align-items: baseline;
    gap: 0.15rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.metric-unit {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Peak speed labels */
.peak-speed-label {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-top: 0.1rem;
}

.peak-unit {
    font-size: 0.65rem;
    font-weight: 600;
}

/* --- DYNAMIC RATING PANEL --- */
.rating-panel {
    padding: 1.25rem 1.5rem;
    border-left: 4px solid var(--accent-download);
    animation: fade-in 0.4s ease-out;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.rating-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.rating-icon-container {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(var(--accent-download-rgb), 0.08);
    color: var(--accent-download);
    display: flex;
    align-items: center;
    justify-content: center;
}

.rating-icon {
    width: 18px;
    height: 18px;
}

.rating-title-group {
    display: flex;
    flex-direction: column;
}

.rating-pretitle {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#rating-grade-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text-primary);
}

.rating-description {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.rating-details-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.rate-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.6rem;
    border-radius: 8px;
    font-size: 0.725rem;
    font-weight: 600;
    background: var(--border-color);
    color: var(--text-muted);
    border: 1px solid transparent;
    transition: all var(--transition-normal);
}

.rate-badge.supported {
    background: rgba(16, 185, 129, 0.08);
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.15);
}

.rate-badge.unsupported {
    opacity: 0.45;
    text-decoration: line-through;
}

.badge-icon {
    width: 12px;
    height: 12px;
}

/* Chart Canvas container */
.chart-legend {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.legend-item.download .legend-color {
    background: var(--accent-download);
    box-shadow: 0 0 6px var(--accent-download);
}

.legend-item.upload .legend-color {
    background: var(--accent-upload);
    box-shadow: 0 0 6px var(--accent-upload);
}

.chart-wrapper {
    position: relative;
    width: 100%;
    height: 170px;
    border-radius: 12px;
}

canvas#speed-chart {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

/* Connection Details Grid */
.connection-panel {
    padding: 1.5rem;
}

.connection-details-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem 1.5rem;
}

@media (max-width: 580px) {
    .connection-details-grid {
        grid-template-columns: 1fr;
        gap: 0.85rem;
    }
}

.info-row {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border-color);
}

.info-label {
    font-size: 0.725rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.info-value {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* --- HISTORY TABLE SECTION --- */
.history-panel {
    animation: fade-in 0.5s ease-out;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.history-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: 14px;
    border: 1px solid var(--border-color);
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.825rem;
}

.history-table th {
    background: rgba(120, 120, 120, 0.03);
    padding: 0.875rem 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    font-size: 0.725rem;
    letter-spacing: 0.5px;
}

.history-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.history-table tbody tr:last-child td {
    border-bottom: none;
}

.history-table tbody tr:hover {
    background: rgba(120, 120, 120, 0.015);
}

.empty-state-row td {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
    font-style: italic;
}

.hist-download-cell {
    color: var(--accent-download);
    font-weight: 600;
}

.hist-upload-cell {
    color: var(--accent-upload);
    font-weight: 600;
}

.history-delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.history-delete-btn:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.06);
}

.history-delete-btn svg {
    width: 15px;
    height: 15px;
}

/* Helper Class */
.hidden {
    display: none !important;
}

/* --- MODAL SYSTEM --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-overlay);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    padding: 1rem;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    width: 100%;
    max-width: 440px;
    padding: 1.75rem;
    transform: translateY(-15px) scale(0.97);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    background: var(--card-bg-solid);
}

@supports (backdrop-filter: blur(1px)) {
    .modal-content {
        background: var(--card-bg);
    }
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    transition: color var(--transition-fast);
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
    margin-bottom: 1.5rem;
}

/* Settings Form Controls */
.setting-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.setting-group label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.setting-control {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.7rem 0.875rem;
    border-radius: 10px;
    font-family: var(--font-primary);
    font-size: 0.875rem;
    width: 100%;
    outline: none;
    transition: border-color var(--transition-fast);
    cursor: pointer;
}

.setting-control:focus {
    border-color: var(--accent-download);
}

/* Toggle Switch Control */
.toggle-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.toggle-container span {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.toggle-container input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
    background-color: var(--border-color);
    border-radius: 34px;
    transition: background-color var(--transition-normal);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    border-radius: 50%;
    transition: transform var(--transition-normal);
}

.toggle-container input:checked + .toggle-slider {
    background-color: var(--accent-download);
}

.toggle-container input:checked + .toggle-slider:before {
    transform: translateX(18px);
}

/* --- SHARE IMAGE SPECIFIC --- */
.card-share-modal {
    max-width: 600px;
}

.share-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.share-preview-container {
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    background: #090d16;
}

.share-preview-canvas {
    width: 100%;
    height: auto;
    display: block;
}

.share-instructions {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.share-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* --- FOOTER DESIGN --- */
.app-footer {
    width: 100%;
    padding: 2rem 1.5rem;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    text-align: center;
    background: rgba(var(--bg-secondary), 0.15);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.app-footer p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.footer-sub {
    font-size: 0.7rem !important;
    color: var(--text-muted) !important;
}

/* --- ANIMATION KEYFRAMES --- */
@keyframes fade-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn-ripple {
    position: absolute;
    background: rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    transform: scale(0);
    animation: ripple-animation 0.5s ease-out;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(5);
        opacity: 0;
    }
}

/* ==========================================================================
   NEW ADDITIONS: POLISH, FUNCTIONALITY & ACCESSIBILITY
   ========================================================================== */

/* 1. Screen Reader Only Utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 2. Skeleton Shimmer Loader */
.skeleton-loader {
    display: inline-block;
    height: 1.1em;
    border-radius: 6px;
    background: linear-gradient(90deg, 
        rgba(120, 120, 120, 0.08) 25%, 
        rgba(120, 120, 120, 0.18) 50%, 
        rgba(120, 120, 120, 0.08) 75%
    );
    background-size: 200% 100%;
    animation: loading-shimmer 1.6s infinite linear;
    vertical-align: middle;
}

.light-theme .skeleton-loader {
    background: linear-gradient(90deg, 
        rgba(0, 0, 0, 0.04) 25%, 
        rgba(0, 0, 0, 0.1) 50%, 
        rgba(0, 0, 0, 0.04) 75%
    );
    background-size: 200% 100%;
}

@keyframes loading-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 3. Inviting Pulse Animation for GO Button */
#start-test-btn:not(.aborting) {
    animation: go-pulse 2s infinite ease-in-out;
}

@keyframes go-pulse {
    0%, 100% {
        box-shadow: 0 6px 24px var(--shadow-glow), 0 0 0 0 rgba(var(--accent-download-rgb), 0.3);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 8px 30px rgba(var(--accent-download-rgb), 0.45), 0 0 0 8px rgba(var(--accent-download-rgb), 0);
        transform: scale(1.05);
    }
}

/* 4. Complete State Styling for Speedometer Panel */
.speedometer-panel.test-finished {
    border-color: rgba(16, 185, 129, 0.3);
    box-shadow: 0 8px 32px 0 var(--shadow), 0 0 20px rgba(16, 185, 129, 0.1);
}

.speedometer-panel.test-finished .speed-number {
    background: linear-gradient(180deg, #34d399 30%, #10b981);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* 5. Error Badge Styling */
.badge.error-badge {
    background: rgba(239, 68, 68, 0.12);
    border-color: #ef4444;
    color: #ef4444;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
}

/* 6. Shared Result Banner */
.banner {
    background: rgba(6, 182, 212, 0.08) !important;
    border-color: rgba(6, 182, 212, 0.25) !important;
    border-radius: 16px;
    padding: 0.85rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    width: 100%;
    animation: fade-in 0.3s ease-out;
}

.banner-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.banner-icon {
    width: 20px;
    height: 20px;
    color: var(--accent-download);
    flex-shrink: 0;
}

.banner-link {
    color: var(--accent-download);
    font-weight: 600;
    text-decoration: underline;
}

.close-banner-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
    transition: color var(--transition-fast);
}

.close-banner-btn:hover {
    color: var(--text-primary);
}

/* 7. Mobile Responsive and Footer Styling Overrides */
@media (max-width: 480px) {
    .modal-content {
        padding: 1.25rem 1rem;
    }
    
    .share-footer {
        flex-direction: column;
        gap: 0.6rem;
        width: 100%;
    }
    
    .share-footer .btn {
        width: 100% !important;
        margin: 0 !important;
    }
    
    .share-link-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .share-link-container button {
        width: 100% !important;
    }
}

/* 8. Calibrating Badge styling */
.badge.calibrating-badge {
    background: rgba(6, 182, 212, 0.12);
    border-color: var(--accent-download);
    color: var(--accent-download);
    box-shadow: 0 0 12px rgba(6, 182, 212, 0.25);
    animation: pulse-border 1.5s infinite;
}

@keyframes pulse-border {
    0%, 100% { border-color: rgba(6, 182, 212, 0.5); }
    50% { border-color: var(--accent-download); }
}