/* ============================================
   BLE Installation Page - Mobile-First Styles
   ============================================ */

:root {
    --primary-color: #1976d2;
    --primary-dark: #1565c0;
    --primary-light: #42a5f5;
    --secondary-color: #424242;
    --success-color: #4caf50;
    --error-color: #f44336;
    --warning-color: #ff9800;
    --info-color: #2196f3;
    --background-color: #fafafa;
    --surface-color: #ffffff;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

html, body {
    width: 100%;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   App Container & Screens
   ============================================ */

.app-container {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--background-color);
    overflow: hidden;
}

.screen {
    display: none;
    flex: 1;
    flex-direction: column;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.screen.active {
    display: flex;
}

.screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

.screen-header h1 {
    font-size: 20px;
    font-weight: 600;
}

.screen-content {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* ============================================
   Login Screen
   ============================================ */

#loginScreen .screen-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg);
}

.logo {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.logo svg {
    width: 100%;
    height: 100%;
}

#loginScreen h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

#loginForm {
    width: 100%;
    max-width: 400px;
}

/* ============================================
   Forms & Inputs
   ============================================ */

.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

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

.form-group label {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px var(--spacing-md);
    font-size: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--surface-color);
    color: var(--text-primary);
    transition: var(--transition);
    min-height: 44px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.form-group input:invalid:not(:placeholder-shown),
.form-group input.error {
    border-color: var(--error-color);
}

.form-hint {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    padding: 12px var(--spacing-md);
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: #616161;
}

.btn-large {
    width: 100%;
    padding: 14px var(--spacing-md);
    font-size: 18px;
    min-height: 48px;
}

.btn-small {
    padding: 8px var(--spacing-md);
    font-size: 14px;
    min-height: 36px;
}

.btn-icon {
    font-size: 20px;
}

/* ============================================
   Progress Indicator
   ============================================ */

.progress-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.progress-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--border-color);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
}

.progress-step.active .progress-number {
    background-color: var(--primary-color);
    color: white;
}

.progress-step.completed .progress-number {
    background-color: var(--success-color);
    color: white;
}

.progress-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
    max-width: 60px;
}

.progress-line {
    flex: 1;
    height: 2px;
    background-color: var(--border-color);
    margin: 0 var(--spacing-sm);
    transition: var(--transition);
}

.progress-step.completed ~ .progress-line {
    background-color: var(--success-color);
}

/* ============================================
   Step Content
   ============================================ */

.step-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

.step-content h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.step-content > p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Device List
   ============================================ */

.device-list {
    margin-top: var(--spacing-lg);
}

.device-list h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.device-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.device-item {
    padding: var(--spacing-md);
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    min-height: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.device-item:active {
    border-color: var(--primary-color);
    background-color: rgba(25, 118, 210, 0.05);
}

.device-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.device-info {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.device-signal {
    display: inline-block;
    margin-left: var(--spacing-sm);
    font-size: 12px;
    padding: 2px 6px;
    background-color: var(--info-color);
    color: white;
    border-radius: 4px;
}

/* ============================================
   Device Info Box
   ============================================ */

.device-info {
    padding: var(--spacing-md);
    background-color: var(--surface-color);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.device-info p {
    font-size: 16px;
    margin: var(--spacing-sm) 0;
}

.device-info strong {
    color: var(--text-primary);
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--success-color);
    color: white;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

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

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

/* ============================================
   Status Messages
   ============================================ */

.status-message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
    font-size: 14px;
    animation: slideIn 0.3s ease;
}

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

.status-message.success {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.status-message.error {
    background-color: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
}

.status-message.info {
    background-color: rgba(33, 150, 243, 0.1);
    color: var(--info-color);
    border-left: 4px solid var(--info-color);
}

.status-message.warning {
    background-color: rgba(255, 152, 0, 0.1);
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.error-message {
    padding: var(--spacing-md);
    background-color: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
    font-size: 14px;
}

/* ============================================
   Credit Explanation
   ============================================ */

.credit-explanation {
    padding: var(--spacing-md);
    background-color: rgba(33, 150, 243, 0.05);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
    border-left: 4px solid var(--info-color);
}

.credit-explanation p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   Registration Progress
   ============================================ */

.registration-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

#registrationMessage {
    font-size: 16px;
    color: var(--text-secondary);
    text-align: center;
}

.registration-result {
    margin-top: var(--spacing-lg);
}

.success-box,
.error-box {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
}

.success-box {
    background-color: rgba(76, 175, 80, 0.1);
    border: 2px solid var(--success-color);
}

.success-box h3 {
    color: var(--success-color);
    font-size: 20px;
    margin-bottom: var(--spacing-md);
}

.success-box p {
    font-size: 16px;
    color: var(--text-primary);
    margin: var(--spacing-sm) 0;
}

.error-box {
    background-color: rgba(244, 67, 54, 0.1);
    border: 2px solid var(--error-color);
}

.error-box h3 {
    color: var(--error-color);
    font-size: 20px;
    margin-bottom: var(--spacing-md);
}

.error-box p {
    font-size: 16px;
    color: var(--text-primary);
    margin: var(--spacing-sm) 0;
}

/* ============================================
   Modal
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.modal-content {
    width: 100%;
    background-color: var(--surface-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    box-shadow: var(--shadow-lg);
    max-height: 90vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

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

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body p {
    font-size: 16px;
    color: var(--text-primary);
    line-height: 1.6;
}

.modal-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
}

.modal-footer .btn {
    flex: 1;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (min-width: 600px) {
    .screen-content {
        padding: var(--spacing-xl);
    }

    #loginScreen .screen-content {
        padding: var(--spacing-xl);
    }

    #loginForm {
        max-width: 500px;
    }

    .progress-container {
        padding: var(--spacing-lg);
    }

    .modal {
        align-items: center;
    }

    .modal-content {
        width: 90%;
        max-width: 500px;
        border-radius: var(--border-radius);
    }
}

@media (min-width: 900px) {
    .screen-content {
        padding: var(--spacing-xl);
        max-width: 800px;
        margin: 0 auto;
    }

    #loginForm {
        max-width: 600px;
    }
}

/* ============================================
   Accessibility
   ============================================ */

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

@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #121212;
        --surface-color: #1e1e1e;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --border-color: #333333;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .screen-header,
    .btn,
    .modal {
        display: none;
    }
}