/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #f5f5f5;
    --color-surface: #ffffff;
    --color-primary: #1a73e8;
    --color-primary-hover: #1557b0;
    --color-text: #202124;
    --color-text-secondary: #5f6368;
    --color-border: #dadce0;
    --color-error: #d93025;
    --color-success: #1e8e3e;
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3);
    --shadow-md: 0 2px 4px 0 rgba(60, 64, 67, 0.3);
    --shadow-lg: 0 4px 8px 0 rgba(60, 64, 67, 0.3);
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #202124;
        --color-surface: #292a2d;
        --color-primary: #8ab4f8;
        --color-primary-hover: #aecbfa;
        --color-text: #e8eaed;
        --color-text-secondary: #e8eaed;
        --color-border: #5f6368;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
}

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

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Focus styles for accessibility */
a:focus,
button:focus,
input:focus,
select:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
header {
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 10;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 500;
}

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

.account-info {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Login page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.login-card {
    background: var(--color-surface);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
}

.login-card h1 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.login-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Form styles */
.form-group {
    margin-bottom: var(--spacing-lg);
}

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

input[type="text"],
input[type="email"],
select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--color-surface);
    color: var(--color-text);
}

input[type="text"]:hover,
input[type="email"]:hover,
select:hover {
    border-color: var(--color-primary);
}

/* Buttons */
button, .button {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s, transform 0.1s;
}

@media (prefers-reduced-motion: reduce) {
    button, .button {
        transition: none;
    }
}

.button-primary {
    background-color: var(--color-primary);
    color: white;
    width: 100%;
}

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

.button-primary:active {
    transform: scale(0.98);
}

.button-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.button-secondary:hover {
    background-color: var(--color-bg);
}

/* Account selector */
.account-list {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.account-button {
    width: 100%;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
}

.account-button:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg);
}

.account-button:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

.account-label {
    font-weight: 600;
    color: var(--color-text);
    display: block;
    margin-bottom: 0.25rem;
}

.account-id {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.account-devices {
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

/* Dashboard sections */
.dashboard-section {
    background: var(--color-surface);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.dashboard-section h2 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

/* Presets grid */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr));
    gap: var(--spacing-md);
    list-style: none;
}

.preset-card {
    position: relative;
    width: 10rem;
    height: 10rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background-color: var(--color-surface);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preset-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preset-number {
    position: absolute;
    top: var(--spacing-xs);
    left: var(--spacing-xs);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.875rem;
}

.preset-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--spacing-sm);
    font-size: 0.875rem;
    text-align: center;
    word-wrap: break-word;
}

/* Devices grid */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
    gap: var(--spacing-md);
    list-style: none;
}

.device-card {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.device-image {
    width: 4rem;
    height: 4rem;
    object-fit: contain;
    flex-shrink: 0;
}

.device-info {
    flex: 1;
    min-width: 0;
}

.device-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
    word-wrap: break-word;
}

.device-type {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

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

/* Error messages */
.error-message {
    background-color: #fce8e6;
    color: var(--color-error);
    padding: var(--spacing-md);
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--color-error);
}

.error-message[role="alert"] {
    /* Ensure screen readers announce this */
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@media (prefers-reduced-motion: reduce) {
    .loading {
        animation: none;
        border-top-color: var(--color-primary);
    }
}

.loading-container {
    text-align: center;
    padding: var(--spacing-xl);
}

/* Tablet breakpoint */
@media (min-width: 768px) {
    .presets-grid {
        grid-template-columns: repeat(3, 10rem);
    }
    
    .devices-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .login-card {
        padding: var(--spacing-xl) 3rem;
    }
}

/* Desktop breakpoint */
@media (min-width: 1024px) {
    .devices-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Print styles */
@media print {
    header {
        position: static;
    }
    
    .button-secondary {
        display: none;
    }
}