/* General Styles */
:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --success-color: #4CAF50;
    --error-color: #f44336;
    --warning-color: #ff9800;
    --bg-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.header .subtitle {
    font-size: 1.2em;
    opacity: 0.9;
}

/* Main Content */
.main {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* Steps */
.step {
    padding: 30px;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.step:last-of-type {
    border-bottom: none;
}

.step h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.5em;
}

.step.info {
    background-color: #f0f7ff;
}

/* Form Controls */
label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-color);
}

select, input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    font-family: inherit;
    transition: all 0.3s ease;
}

select:hover, input:hover {
    border-color: var(--primary-color);
}

select:focus, input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* Board Selector */
.board-selector, .version-selector {
    margin-bottom: 20px;
}

.board-info, .version-info {
    background: #f9f9f9;
    padding: 15px;
    border-left: 4px solid var(--primary-color);
    margin-top: 10px;
    border-radius: 4px;
    font-size: 0.95em;
    color: #555;
}

/* Flash Controls */
.flash-controls {
    margin-top: 20px;
}

.instructions {
    background: #f0f7ff;
    border-left: 4px solid var(--primary-color);
    padding: 15px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.instructions ol {
    margin-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    display: inline-block;
    text-align: center;
    text-decoration: none;
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    box-shadow: 0 4px 8px rgba(25, 118, 210, 0.3);
    transform: translateY(-2px);
}

.btn-large {
    width: 100%;
    padding: 16px;
    font-size: 1.1em;
}

.btn-secondary {
    background-color: #757575;
    color: white;
}

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

/* Progress Bar */
.progress {
    margin-top: 20px;
    padding: 15px;
    background: #f9f9f9;
    border-radius: 4px;
}

.progress-bar {
    width: 0%;
    height: 8px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--success-color) 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
    margin-bottom: 10px;
}

#progress-text {
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
}

/* Status Messages */
.status-msg {
    margin-top: 20px;
    padding: 15px;
    border-radius: 4px;
    border-left: 4px solid;
}

.status-msg.success {
    background-color: #e8f5e9;
    border-color: var(--success-color);
    color: #2e7d32;
}

.status-msg.error {
    background-color: #ffebee;
    border-color: var(--error-color);
    color: #c62828;
}

.status-msg.info {
    background-color: #e3f2fd;
    border-color: var(--primary-color);
    color: #1565c0;
}

.status-msg.warning {
    background-color: #fff3e0;
    border-color: var(--warning-color);
    color: #e65100;
}

/* Details / Accordion */
details {
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0;
}

details summary {
    padding: 15px;
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

details summary:hover {
    background-color: #f9f9f9;
}

details[open] summary {
    background-color: #f0f7ff;
    border-bottom: 1px solid var(--border-color);
}

details p, details ul {
    padding: 15px;
    margin: 0;
}

details ul {
    margin-left: 20px;
}

details li {
    margin-bottom: 8px;
}

details a {
    color: var(--primary-color);
    text-decoration: none;
}

details a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 40px;
    padding: 30px 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
    border-top: 1px solid var(--border-color);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 10px;
}

.footer a:hover {
    text-decoration: underline;
}

.footer p {
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header {
        padding: 20px 15px;
    }

    .header h1 {
        font-size: 1.8em;
    }

    .header .subtitle {
        font-size: 1em;
    }

    .step {
        padding: 20px;
    }

    .step h2 {
        font-size: 1.3em;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5em;
    }

    .step {
        padding: 15px;
    }

    select, input, .btn {
        font-size: 16px; /* Prevent zoom on iOS */
    }
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(33, 150, 243, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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