:root {
    --primary-color: #2E3440;
    --secondary-color: #3B4252;
    --accent-color: #434C5E;
    --text-light: #D8DEE9;
    --highlight: #88C0D0;
    --success: #A3BE8C;
    --warning: #EBCB8B;
    --danger: #BF616A;
    --background: #2E3440;
    --surface: #3B4252;
    --border-radius: 12px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-light);
    min-height: 100vh;
    padding-bottom: 80px;
}

.app-header {
    background: var(--surface);
    padding: 1rem;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.5rem;
}

.status-indicator {
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

.app-main {
    padding: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Scanner Styles */
.scanner-container {
    text-align: center;
}

.radar-container {
    position: relative;
    margin: 2rem auto;
    width: 300px;
    height: 300px;
}

#radar-canvas {
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-color) 0%, var(--primary-color) 100%);
    box-shadow: var(--shadow);
}

.radar-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    z-index: 10;
}

.scan-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
}

.primary-btn, .secondary-btn, .danger-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.primary-btn:hover {
    background: #7fb3c3;
    transform: translateY(-2px);
}

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

.secondary-btn:hover {
    background: #4c566a;
    transform: translateY(-2px);
}

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

.danger-btn:hover {
    background: #a54b5b;
    transform: translateY(-2px);
}

.networks-container {
    margin-top: 2rem;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    opacity: 0.6;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.network-item {
    background: var(--surface);
    padding: 1rem;
    margin: 0.5rem 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.network-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.network-info h3 {
    margin-bottom: 0.25rem;
}

.network-details {
    font-size: 0.85rem;
    opacity: 0.7;
}

.signal-strength {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.signal-bars {
    display: flex;
    gap: 2px;
    align-items: end;
}

.signal-bar {
    width: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.signal-bar.active.strong { background: var(--success); }
.signal-bar.active.moderate { background: var(--warning); }
.signal-bar.active.weak { background: var(--danger); }

.signal-bar:nth-child(1) { height: 8px; }
.signal-bar:nth-child(2) { height: 12px; }
.signal-bar:nth-child(3) { height: 16px; }
.signal-bar:nth-child(4) { height: 20px; }

/* Channels Styles */
.channels-container h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.channel-visualization {
    background: var(--surface);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
    text-align: center;
}

.channel-legend {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.color-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.color-indicator.strong { background: var(--success); }
.color-indicator.moderate { background: var(--warning); }
.color-indicator.weak { background: var(--danger); }

.recommendations-box {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-top: 1rem;
}

.recommendations-box h3 {
    margin-bottom: 1rem;
    color: var(--highlight);
}

/* Speed Test Styles */
.speedtest-container {
    text-align: center;
}

.speedtest-container h2 {
    margin-bottom: 2rem;
}

.speed-gauge {
    position: relative;
    margin: 2rem auto;
    width: 250px;
    height: 150px;
}

.speed-value {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
}

#speed-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--highlight);
}

.speed-unit {
    font-size: 1rem;
    opacity: 0.7;
}

.speed-controls {
    margin: 2rem 0;
}

.speed-history {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-top: 2rem;
}

.speed-history h3 {
    margin-bottom: 1rem;
    color: var(--highlight);
}

#history-chart {
    text-align: center;
}

/* History Styles */
.history-container h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.history-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.history-list {
    max-height: 400px;
    overflow-y: auto;
}

.history-item {
    background: var(--surface);
    padding: 1rem;
    margin: 0.5rem 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.history-item h4 {
    color: var(--highlight);
    margin-bottom: 0.5rem;
}

.history-details {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* FAQ Styles */
.faq-section {
    margin: 3rem 0 2rem;
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.faq-container {
    max-width: 600px;
    margin: 0 auto;
}

.faq-item {
    background: var(--surface);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1rem;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--accent-color);
}

.faq-icon {
    font-size: 1.2rem;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1rem 1rem;
    animation: slideDown 0.3s ease-out;
}

.faq-answer[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    display: flex;
    justify-content: space-around;
    padding: 0.75rem 0;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    opacity: 0.6;
    transition: var(--transition);
    padding: 0.25rem;
    border-radius: 8px;
    min-width: 60px;
}

.nav-item.active {
    opacity: 1;
    color: var(--highlight);
}

.nav-item:hover {
    opacity: 1;
    background: var(--accent-color);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    background: var(--primary-color);
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Animations */
@keyframes radarSweep {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.radar-sweep {
    animation: radarSweep 2s linear infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

.pulse {
    animation: pulse 1s ease-in-out infinite;
}

/* Responsive Design */
@media (max-width: 480px) {
    .app-main {
        padding: 0.5rem;
    }
    
    .radar-container {
        width: 250px;
        height: 250px;
    }
    
    #radar-canvas {
        width: 250px;
        height: 250px;
    }
    
    .scan-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .primary-btn, .secondary-btn, .danger-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .history-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .channel-legend {
        flex-direction: column;
        align-items: center;
    }
}

@media (min-width: 768px) {
    .app-main {
        padding: 2rem;
    }
    
    .bottom-nav {
        position: relative;
        background: var(--surface);
        border-radius: var(--border-radius);
        margin: 2rem auto 0;
        max-width: 600px;
        box-shadow: var(--shadow);
    }
    
    body {
        padding-bottom: 0;
    }
    
    .nav-item {
        padding: 1rem;
        min-width: 100px;
    }
    
    .nav-item i {
        font-size: 1.5rem;
    }
    
    .nav-item span {
        font-size: 0.9rem;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--highlight);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}