:root {
    --bg-primary: #070910;
    --bg-secondary: #111525;
    --bg-tertiary: #1b2033;
    --bg-glass: rgba(23, 29, 47, 0.8);
    --accent-primary: #ff6b35;
    --accent-secondary: #f7931e;
    --accent-gradient: linear-gradient(135deg, #ff6b35, #f7931e);
    --text-primary: #f5f6fa;
    --text-secondary: #9aa0a6;
    --border-color: rgba(255, 255, 255, 0.08);
    --success: #2ec27e;
    --warning: #fbbc05;
    --error: #f5515f;
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.45);
    --shadow-accent: 0 0 30px rgba(255, 107, 53, 0.3);
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at 10% 20%, rgba(255, 107, 53, 0.15), transparent 45%),
        radial-gradient(circle at 90% 10%, rgba(247, 147, 30, 0.12), transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(52, 168, 83, 0.08), transparent 55%),
        var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
}

header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(7, 9, 16, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.branding {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-container {
    width: 64px;
    height: 64px;
    border-radius: 20px;
    background: var(--accent-gradient);
    display: grid;
    place-items: center;
    box-shadow: var(--shadow-accent);
    position: relative;
    overflow: hidden;
}

.logo-container::after {
    content: '';
    position: absolute;
    inset: 8px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.05em;
}

.title-container h1 {
    margin: 0;
    font-size: 1.6rem;
    letter-spacing: -0.02em;
}

.powered-by {
    margin: 4px 0 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 10px var(--success);
}

.header-meta {
    text-align: right;
}

.meta-label {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.meta-value {
    margin: 2px 0 0;
    font-weight: 600;
}

main {
    padding-top: 24px;
}

.card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 28px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 28px;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    border: 1px solid transparent;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.card-header h2,
.card-header h3 {
    margin: 4px 0 0;
}

.card-header-icon {
    font-size: 1.7rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0;
}

.hero {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.25), rgba(10, 14, 26, 0.8));
}

.hero-copy {
    margin: 0 0 24px;
    color: var(--text-secondary);
}

.hero-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    padding-top: 8px;
}

.release-link-block {
    display: flex;
    justify-content: flex-end;
    align-self: flex-end;
}

.release-notes-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    width: fit-content;
    border: 1px solid var(--border-color);
    transition: background 0.2s ease, transform 0.2s ease;
}

.release-notes-link:hover {
    background: rgba(255, 255, 255, 0.14);
    transform: translateY(-1px);
}

.release-notes-link.disabled {
    opacity: 0.55;
    pointer-events: none;
    transform: none;
}

.metric-label {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0;
}

.metric-value {
    margin: 4px 0 0;
    font-size: 1.4rem;
    font-weight: 600;
}

.layout-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.field-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

.wifi-helper {
    margin: 0 0 12px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.select-wrapper {
    position: relative;
}

select {
    width: 100%;
    padding: 14px 48px 14px 16px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 1rem;
    appearance: none;
}

.inline-select {
    max-width: 260px;
}

.inline-select select {
    padding: 10px 40px 10px 14px;
    font-size: 1.05rem;
    font-weight: 600;
}

.wifi-card input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 1rem;
}

.wifi-form .field-group+.field-group {
    margin-top: 12px;
}

.wifi-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.wifi-status {
    margin-top: 14px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.wifi-actions .primary-btn {
    width: auto;
}

.wifi-dialog {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.wifi-dialog.hidden {
    pointer-events: none;
}

.wifi-dialog:not(.hidden) {
    pointer-events: auto;
    opacity: 1;
}

.wifi-dialog-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(5, 6, 13, 0.9);
}

.wifi-dialog-panel {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 32px;
    width: min(460px, 90vw);
    z-index: 2;
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.2s ease;
}

.wifi-dialog-close {
    position: absolute;
    top: 12px;
    right: 12px;
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    display: grid;
    place-items: center;
}

.wifi-dialog-note {
    margin: 0 0 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.wifi-dialog-disclaimer {
    margin-top: 20px;
    font-size: 0.85rem;
    color: var(--warning);
    border-top: 1px dashed rgba(255, 255, 255, 0.3);
    padding-top: 14px;
    line-height: 1.4;
}

.wifi-dialog.hidden .wifi-dialog-backdrop {
    display: none;
}

.select-caret {
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    font-size: 1.2rem;
}

.board-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.summary-label {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin: 0 0 6px;
}

.summary-value {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.status-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    text-transform: capitalize;
    font-weight: 600;
}

.status-chip::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    box-shadow: 0 0 8px var(--warning);
}

.status-chip[data-state="stable"]::before {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-chip[data-state="beta"]::before {
    background: var(--warning);
}

.file-list ul {
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
}

.file-list li {
    padding: 6px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.file-list li:last-child {
    border-bottom: none;
}

.primary-btn {
    width: 100%;
    border: none;
    border-radius: 18px;
    padding: 16px;
    font-size: 1rem;
    font-weight: 600;
    color: #0b0d16;
    background: var(--accent-gradient);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

.ghost-btn {
    background: rgba(255, 255, 255, 0.08);
    border: none;
    border-radius: 999px;
    color: var(--text-primary);
    padding: 6px 14px;
    cursor: pointer;
    font-size: 0.85rem;
}

.download-actions {
    margin-top: 12px;
    display: flex;
    justify-content: flex-start;
}

.download-actions .ghost-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.2s ease, transform 0.2s ease;
}

.download-actions .ghost-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
}

.download-actions .ghost-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.download-actions .ghost-btn svg {
    flex-shrink: 0;
}

.ota-block {
    margin-top: 18px;
    padding: 16px;
    border-radius: 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.ota-header h4 {
    margin: 0 0 6px;
    font-size: 1.05rem;
}

.ota-header p {
    margin: 0 0 12px;
    color: var(--text-secondary);
}

.update-ota-section {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    margin-top: 16px;
}

.update-ota-section h4 {
    margin: 0 0 8px 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.update-ota-section p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.instructions ol {
    padding-left: 20px;
    margin: 0 0 24px;
    color: var(--text-secondary);
}

.instructions.compact ol {
    margin: 0;
}

.board-notes {
    margin-top: 16px;
}

.notes-list {
    list-style: disc;
    padding-left: 20px;
    margin: 0;
    color: var(--text-primary);
}

.notes-list li {
    padding: 0;
    margin: 6px 0;
    border: none;
    background: transparent;
}

.log-card {
    grid-column: 1 / -1;
}

.log-stream {
    min-height: 220px;
    background: #05060d;
    border-radius: 12px;
    padding: 16px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
    color: #e2e9ff;
    overflow-y: auto;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.log-entry {
    margin: 0 0 6px 0;
}

.log-entry.info {
    color: #a0c4ff;
}

.log-entry.warn {
    color: #ffd166;
}

.log-entry.error {
    color: #ff6b6b;
}

/* Port Selector Dialog */
.port-selector-dialog {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.port-selector-dialog:not(.hidden) {
    pointer-events: auto;
    opacity: 1;
}

.port-selector-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(5, 6, 13, 0.9);
}

.port-selector-panel {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 28px;
    width: min(420px, 90vw);
    z-index: 2;
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.2s ease;
}

.port-selector-panel h3 {
    margin: 0 0 8px;
}

.port-selector-note {
    margin: 0 0 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.port-selector-close {
    position: absolute;
    top: 12px;
    right: 12px;
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    display: grid;
    place-items: center;
}

.port-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
    max-height: 240px;
    overflow-y: auto;
}

.port-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.port-item:hover {
    border-color: var(--accent-primary);
}

.port-item.selected {
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(255, 107, 53, 0.3);
}

.port-item-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(255, 107, 53, 0.15);
    display: grid;
    place-items: center;
    color: var(--accent-primary);
    font-size: 0.75rem;
    font-weight: 600;
}

.port-item-info {
    flex: 1;
}

.port-item-info strong {
    display: block;
    margin-bottom: 2px;
}

.port-item-info small {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.port-authorize-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
}

/* Flash Overlay */
.flash-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 1100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.flash-overlay:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.flash-overlay-backdrop {
    position: absolute;
    inset: 0;
}

.flash-overlay-panel {
    position: relative;
    width: min(640px, 95vw);
    max-height: 85vh;
    background: rgba(5, 6, 13, 0.98);
    border-radius: 24px;
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 2;
}

.flash-overlay-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.flash-overlay-close {
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    display: grid;
    place-items: center;
    transition: background 0.2s ease;
}

.flash-overlay-close:hover {
    background: rgba(255, 255, 255, 0.12);
}

/* Progress Bar */
.flash-progress-container {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 16px;
}

.flash-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.flash-stage {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
}

.flash-percent {
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 1rem;
}

.flash-progress-bar {
    height: 10px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 5px;
    overflow: hidden;
}

.flash-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-gradient);
    border-radius: 5px;
    transition: width 0.3s ease;
}

/* Flash Log Stream */
.flash-log-stream {
    flex: 1;
    min-height: 280px;
    max-height: calc(85vh - 200px);
    background: rgba(8, 10, 16, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 16px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.85rem;
    color: #e2e9ff;
    overflow-y: auto;
}

.flash-log-stream::-webkit-scrollbar {
    width: 6px;
}

.flash-log-stream::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.25);
    border-radius: 999px;
}

.flash-log-stream .log-entry {
    margin: 0 0 4px 0;
    line-height: 1.4;
}

.flash-log-stream .log-entry.success {
    color: var(--success);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 640px) {
    .flash-overlay-panel {
        width: calc(100% - 32px);
        max-height: 90vh;
    }
}

.muted {
    color: var(--text-secondary);
    margin: 0;
}

.warning-text {
    display: block;
    padding: 12px;
    border-radius: 12px;
    background: rgba(255, 107, 53, 0.18);
    border: 1px solid rgba(255, 107, 53, 0.4);
    font-size: 0.9rem;
    margin-top: 12px;
}

.small-print {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    padding: 2px 6px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.08);
}

footer {
    border-top: 1px solid var(--border-color);
    margin-top: 48px;
    background: rgba(7, 9, 16, 0.85);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .header-meta {
        text-align: left;
    }

    .card {
        padding: 22px;
    }

    .layout-grid {
        grid-template-columns: 1fr;
    }
}

/* Polished UI Additions */
.hidden {
    display: none !important;
}

/* WiFi Controls */
.wifi-controls {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.wifi-controls .primary-btn {
    width: auto;
}

/* Warning Dialog */
.warning-panel {
    text-align: center;
    max-width: 400px;
}

.warning-icon-large {
    width: 64px;
    height: 64px;
    background: rgba(251, 188, 5, 0.15);
    color: var(--warning);
    font-size: 2rem;
    font-weight: 700;
    border-radius: 50%;
    margin: 0 auto 20px;
    display: grid;
    place-items: center;
}

.danger-btn {
    background: linear-gradient(135deg, #ff4757, #ff6b81);
    box-shadow: 0 4px 15px rgba(255, 71, 87, 0.3);
}

.danger-btn:hover {
    box-shadow: 0 6px 20px rgba(255, 71, 87, 0.4);
}

/* Custom Checkbox */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    margin: 24px 0 8px;
    text-align: left;
    background: rgba(255, 255, 255, 0.03);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s;
}

.checkbox-wrapper:hover {
    border-color: var(--text-secondary);
}

.checkbox-wrapper input {
    display: none;
}

.checkbox-box {
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 6px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.checkbox-wrapper input:checked+.checkbox-box {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkbox-wrapper input:checked+.checkbox-box::after {
    content: '✓';
    color: white;
    font-size: 0.9rem;
    font-weight: 700;
}

.checkbox-label {
    font-weight: 600;
    color: var(--text-primary);
}

.checkbox-help {
    text-align: left;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0 0 24px;
    padding-left: 12px;
}

.start-flash-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 8px;
}

.start-flash-actions .primary-btn {
    width: auto;
}