:root {
    --bg: #070709;
    --surface: #111116;
    --surface-2: #1a1a22;
    --border: #2a2a35;
    --border-hover: #4a4a60;
    --text: #f0f0f5;
    --text-muted: #6b6b85;
    --accent: #363636;
    --accent-dim: rgba(124, 111, 247, 0.15);
    --success: #22d3a5;
    --success-dim: rgba(34, 211, 165, 0.12);
    --danger: #ff5566;
    --warn: #f5a623;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    line-height: 1.6;
    overscroll-behavior: none;
}

.app-container {
    width: 100%;
    max-width: 540px;
    padding: 1.5rem 1rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 0;
    min-height: 100dvh;
}

/* ===== HEADER ===== */
header {
    text-align: center;
    padding: 1.5rem 0 1.25rem;
}

.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

h1 {
    font-family: 'Space Mono', monospace;
    font-size: clamp(2rem, 7vw, 3rem);
    font-weight: 700;
    letter-spacing: -2px;
    background: linear-gradient(135deg, #fff 0%, #a0a0c0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.dot {
    -webkit-text-fill-color: #22d3a5
}

.version-badge {
    font-family: 'Space Mono', monospace;
    font-size: 0.65rem;
    font-weight: 700;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(124, 111, 247, 0.3);
    padding: 0.2rem 0.45rem;
    border-radius: 99px;
    letter-spacing: 0.05em;
    margin-top: 4px;
    align-self: flex-start;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    margin-top: 0.25rem;
}

/* ===== TABS ===== */
.tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.3rem;
}

.tab-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
}

.tab-btn svg {
    flex-shrink: 0;
}

.tab-btn:hover {
    color: var(--text);
}

.tab-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 12px rgba(58, 58, 58, 0.45);
}

.tab-content {
    display: none;
    flex-direction: column;
    gap: 1rem;
    flex: 1;
}

.tab-content.active {
    display: flex;
}

/* ===== CONTROL PANEL ===== */
.control-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.input-group label {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.input-row {
    display: flex;
    gap: 0.5rem;
}

input[type="text"] {
    flex: 1;
    min-width: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.7rem 0.9rem;
    font-family: 'Space Mono', monospace;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition);
    -webkit-appearance: none;
}

input[type="text"]:focus {
    border-color: var(--accent);
}

button {
    font-family: 'Space Mono', monospace;
    font-weight: 700;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    padding: 0.7rem 1.1rem;
}

.primary-btn {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 10px rgba(58, 58, 58, 0.45);
}

.primary-btn:hover:not(:disabled) {
    background: #919191;
    box-shadow: 0 4px 16px rgba(145, 145, 145, 0.45);
    transform: translateY(-1px);
}

.primary-btn:active:not(:disabled) {
    transform: translateY(0);
}

.primary-btn:disabled {
    background: var(--border);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}

.secondary-btn {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
}

.secondary-btn:hover:not(:disabled) {
    border-color: var(--border-hover);
    background: var(--border);
}

.secondary-btn:disabled {
    color: var(--text-muted);
    cursor: not-allowed;
}

.full-width {
    width: 100%;
}

.download-row {
    display: flex;
    gap: 0.75rem;
    width: 100%;
}

.flex-1 {
    flex: 1;
}

/* ===== CHAR COUNT ===== */
.char-count-row {
    text-align: center;
}

.char-count {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ===== CANVAS ===== */
.canvas-container {
    background: #000;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 1/1;
    display: flex;
    align-items: center;
    justify-content: center;
}

canvas#barcodeCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Segmented Control - Premium Toggle */
.segmented-control {
    position: relative;
    background: #000;
    border: 2px solid var(--border);
    padding: 4px;
    margin-top: 1rem;
    box-shadow: 4px 4px 0px var(--border);
}

.segmented-control-input {
    display: none;
}

.segmented-control-label {
    display: flex;
    position: relative;
    cursor: pointer;
    align-items: center;
    justify-content: space-between;
    padding: 0;
    height: 38px;
    z-index: 1;
}

.label-text {
    flex: 1;
    text-align: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
    z-index: 2;
    transition: color 0.3s ease;
    user-select: none;
    letter-spacing: -0.02em;
}

.glider {
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: var(--bg-card);
    border: 2px solid var(--border);
    transition: transform 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    z-index: 1;
}

.segmented-control-input:checked+.segmented-control-label .glider {
    transform: translateX(100%);
}

.segmented-control-input:not(:checked)+.segmented-control-label .off-text {
    color: var(--text-primary);
}

.segmented-control-input:checked+.segmented-control-label .on-text {
    color: var(--text-primary);
}

/* ===== SCANNER CONTROLS ===== */
.scanner-controls {
    gap: 0.75rem;
}

.status-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: all var(--transition);
    flex-shrink: 0;
}

.status-dot.ready {
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
}

.status-dot.active {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
    animation: pulse-dot 1.5s infinite;
}

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

@keyframes pulse-dot {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(0.8);
    }
}

.status-text {
    font-family: 'Space Mono', monospace;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.btn-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn-row .primary-btn {
    flex: 1;
}

.upload-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.7rem 1rem;
}

/* ===== SCANNER VIEW ===== */
.scanner-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
    background: #000;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

#videoElement {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

#scannerOverlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
}

.scanner-frame {
    position: absolute;
    top: 10%;
    left: 10%;
    width: 80%;
    height: 80%;
    z-index: 20;
    pointer-events: none;
    display: none;
}

.scanner-frame.active {
    display: block;
}

.corner {
    position: absolute;
    width: 24px;
    height: 24px;
    border-color: var(--accent);
    border-style: solid;
}

.corner.tl {
    top: 0;
    left: 0;
    border-width: 3px 0 0 3px;
    border-radius: 4px 0 0 0;
}

.corner.tr {
    top: 0;
    right: 0;
    border-width: 3px 3px 0 0;
    border-radius: 0 4px 0 0;
}

.corner.bl {
    bottom: 0;
    left: 0;
    border-width: 0 0 3px 3px;
    border-radius: 0 0 0 4px;
}

.corner.br {
    bottom: 0;
    right: 0;
    border-width: 0 3px 3px 0;
    border-radius: 0 0 4px 0;
}

.scan-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    box-shadow: 0 0 6px var(--accent);
    animation: scan-sweep 2s ease-in-out infinite;
    display: none;
}

.scanner-frame.active .scan-line {
    display: block;
}

@keyframes scan-sweep {
    0% {
        top: 0;
        opacity: 1;
    }

    90% {
        top: calc(100% - 2px);
        opacity: 1;
    }

    100% {
        top: calc(100% - 2px);
        opacity: 0;
    }
}

.scanner-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--text-muted);
    z-index: 5;
}

.scanner-placeholder p {
    font-size: 0.8rem;
    text-align: center;
    padding: 0 2rem;
}

/* ===== RESULT PANEL ===== */
.result-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.result-header h3 {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 1.5px;
}

.scan-confidence {
    font-family: 'Space Mono', monospace;
    font-size: 0.65rem;
    color: var(--success);
}

.result-text {
    font-family: 'Space Mono', monospace;
    font-size: clamp(1.1rem, 4vw, 1.6rem);
    color: var(--success);
    word-break: break-all;
    line-height: 1.4;
    min-height: 1.5em;
    transition: color var(--transition);
}

.result-text.waiting {
    color: var(--text-muted);
}

.scan-info {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.goto-link-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--success-dim);
    color: var(--success);
    border: 1px solid rgba(34, 211, 165, 0.3);
    border-radius: var(--radius-sm);
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    text-decoration: none;
    transition: all var(--transition);
    margin-top: 0.25rem;
    -webkit-tap-highlight-color: transparent;
}

.goto-link-btn:hover {
    background: rgba(34, 211, 165, 0.2);
    box-shadow: 0 2px 12px rgba(34, 211, 165, 0.2);
    transform: translateY(-1px);
}

/* ===== FOOTER ===== */
footer {
    margin-top: auto;
    padding-top: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

footer a:hover {
    color: var(--text);
    text-decoration: underline;
}

/* ===== DESKTOP ===== */
@media (min-width: 768px) {
    .app-container {
        max-width: 900px;
        padding: 2rem;
    }

    header {
        padding: 2rem 0 1.5rem;
    }

    main {
        display: grid;
        grid-template-rows: auto 1fr;
    }

    .tabs {
        grid-column: 1 / -1;
        max-width: 300px;
        margin: 0 auto 1.5rem;
    }

    /* Side-by-side layout on desktop */
    .tab-content.active.desktop-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.25rem;
        align-items: start;
    }

    #generator.active {
        display: grid;
        grid-template-columns: auto 1fr;
        grid-template-rows: auto auto;
        gap: 1.25rem;
        align-items: start;
    }

    #generator .control-panel {
        grid-column: 1 / -1;
    }

    #generator .canvas-container {
        width: 380px;
        max-width: 380px;
        align-self: start;
    }

    #generator .char-count-row {
        display: flex;
        align-items: center;
        text-align: left;
        padding-left: 0.25rem;
    }

    #scanner.active {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto 1fr;
        gap: 1.25rem;
        align-items: start;
    }

    #scanner .scanner-controls {
        grid-column: 1 / -1;
    }

    .scanner-container {
        width: 100%;
        max-width: 400px;
    }

    .result-panel {
        align-self: stretch;
    }

    .result-text {
        font-size: 1.5rem;
    }
}