/* ============================================
   QR Code Generator Styles
   Dark premium, futuristic scan-ready aesthetic
============================================ */

:root {
    --bg: #0a0a16;
    --surface: rgba(255, 255, 255, 0.04);
    --surface-hover: rgba(255, 255, 255, 0.07);
    --border: rgba(255, 255, 255, 0.08);
    --text: #f1f5f9;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --green: #10b981;
    --radius: 14px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    background-image:
        radial-gradient(ellipse at 10% 10%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 90% 90%, rgba(16, 185, 129, 0.06) 0%, transparent 50%);
}

/* --- Nav --- */
.tool-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--text);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    color: var(--accent);
}

/* --- Container & Header --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

.tool-header {
    text-align: center;
    margin-bottom: 3rem;
}

.header-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent);
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #f1f5f9 40%, var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.75rem;
}

.tool-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.65;
}

/* --- Two-column layout --- */
.tool-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 2rem;
    align-items: start;
}

/* --- Controls Panel --- */
.controls-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.section-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

/* QR Type Tabs */
.type-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.type-tab {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--surface-hover);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
}

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

.type-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Input Fields */
.input-group {
    margin-bottom: 1rem;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.input-group input,
.input-group textarea,
.input-group select {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    font-family: 'Outfit', sans-serif;
    transition: border-color 0.2s;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--accent);
}

.input-group textarea {
    resize: vertical;
    min-height: 80px;
}

.input-group select {
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

/* Style rows */
.style-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.style-row:last-child {
    margin-bottom: 0;
}

.style-group {
    flex: 1;
}

.style-group.full {
    flex: 100%;
}

.style-group>label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

/* Color mini picker */
.color-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.75rem;
}

.color-mini input[type="color"] {
    -webkit-appearance: none;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    background: transparent;
}

.color-mini input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-mini input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 5px;
}

.color-mini span {
    font-family: monospace;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    background: transparent;
    margin-top: 0.25rem;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    margin-top: -6px;
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-glow);
}

/* ECL Buttons */
.ecl-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.ecl-btn {
    flex: 1;
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    font-weight: 700;
    font-size: 0.85rem;
    transition: all 0.2s;
}

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

.ecl-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    border: none;
    border-radius: var(--radius);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: all 0.2s;
    box-shadow: 0 8px 20px var(--accent-glow);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px var(--accent-glow);
}

.generate-btn:active {
    transform: translateY(0);
}

/* --- Preview Panel --- */
.preview-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    position: sticky;
    top: 2rem;
}

.qr-canvas-wrapper {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    position: relative;
}

.qr-output {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* The actual QR code canvas/table gets these override styles */
.qr-output canvas,
.qr-output img {
    border-radius: 6px;
    max-width: 100%;
    display: block;
}

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    text-align: center;
}

.qr-placeholder i {
    font-size: 4rem;
    opacity: 0.2;
}

.qr-placeholder span {
    font-size: 0.9rem;
}

/* Download & Copy Buttons */
.download-row {
    display: flex;
    gap: 0.75rem;
    width: 100%;
}

.download-btn {
    flex: 1;
    padding: 0.75rem;
    background: var(--green);
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.download-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.copy-img-btn {
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.copy-img-btn:hover {
    background: var(--surface-hover);
}

/* Privacy Badge */
.privacy-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    color: var(--text-muted);
    background: rgba(16, 185, 129, 0.06);
    border: 1px solid rgba(16, 185, 129, 0.15);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    width: 100%;
    justify-content: center;
}

.privacy-badge i {
    color: var(--green);
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--green);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    box-shadow: 0 10px 15px rgba(16, 185, 129, 0.3);
    transform: translateY(150%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 9999;
}

.toast.show {
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .tool-layout {
        grid-template-columns: 1fr;
    }

    .preview-panel {
        position: static;
    }

    h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.8rem;
    }

    .type-tabs {
        grid-template-columns: 1fr 1fr;
    }
}