/* RemoteSDR - Responsive CSS */

/* CSS Variables */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --accent-primary: #e94560;
    --accent-secondary: #0f9b0f;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #2a2a4a;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --font-mono: 'Courier New', Courier, monospace;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base */
html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* Container - Mobile First */
.container {
    padding: var(--spacing-md);
    max-width: 100%;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-primary);
}

/* Connection Status */
.connection-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-dot.disconnected {
    background-color: var(--error-color);
}

.status-dot.connected {
    background-color: var(--success-color);
}

.status-dot.connecting {
    background-color: var(--warning-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Sections */
section {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.section-header h2 {
    font-size: 1rem;
    font-weight: 500;
}

/* Control Groups */
.controls-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.control-group label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 44px;
    min-width: 44px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: #d13550;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: #1a4a7a;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 36px;
    font-size: 0.8125rem;
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
}

/* Inputs */
input[type="number"],
input[type="text"] {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    min-height: 44px;
    width: 100%;
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.freq-input-group {
    display: flex;
    gap: var(--spacing-sm);
}

.freq-input-group input {
    flex: 1;
}

/* Sliders */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--text-primary);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--text-primary);
}

/* Select */
.select {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    min-height: 44px;
    width: 100%;
    cursor: pointer;
}

.select-small {
    min-height: 36px;
    padding: var(--spacing-xs) var(--spacing-sm);
    width: auto;
}

/* Spectrum Display */
.spectrum-container {
    position: relative;
    width: 100%;
    background-color: var(--bg-primary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

#spectrumCanvas {
    display: block;
    width: 100%;
    height: 200px;
    touch-action: none;
}

.spectrum-info {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.spectrum-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* Audio Controls */
.audio-controls {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

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

.volume-control label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Presets */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.preset-btn {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 0.75rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 44px;
}

.preset-btn:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.preset-btn .freq {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Status Bar */
.status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.75rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Tablet (>768px) */
@media (min-width: 768px) {
    .container {
        padding: var(--spacing-lg);
    }

    .header h1 {
        font-size: 1.75rem;
    }

    .controls-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    #spectrumCanvas {
        height: 250px;
    }

    .presets-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .status-bar {
        position: static;
        border-radius: var(--radius-md);
        margin-top: var(--spacing-md);
    }
}

/* Desktop (>1024px) */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: var(--spacing-xl);
    }

    .controls-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    #spectrumCanvas {
        height: 300px;
    }

    .presets-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    /* Remove hover states on touch devices */
    @media (hover: hover) {
        .btn:hover:not(:disabled) {
            transform: translateY(-1px);
        }

        .slider::-webkit-slider-thumb:hover {
            transform: scale(1.1);
        }
    }
}

/* Large Desktop (>1400px) */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }

    #spectrumCanvas {
        height: 350px;
    }
}

/* Dark mode preference */
@media (prefers-color-scheme: light) {
    /* Could add light mode here if needed */
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Touch device optimizations */
@media (pointer: coarse) {
    .btn {
        min-height: 48px;
    }

    .slider::-webkit-slider-thumb {
        width: 28px;
        height: 28px;
    }

    .preset-btn {
        min-height: 48px;
    }
}