/* ============================================
   QR TOOL — tao-ma-qr.html
   Prefix: .qt-* (qr-tool)
   ============================================ */

/* --- Hero --- */
.qt-hero {
    background:
        radial-gradient(ellipse 50% 60% at 30% 20%, rgba(99, 102, 241, 0.15), transparent 70%),
        radial-gradient(ellipse 40% 50% at 80% 60%, rgba(168, 85, 247, 0.10), transparent 60%),
        radial-gradient(ellipse 60% 40% at 50% 100%, rgba(59, 130, 246, 0.08), transparent 50%),
        var(--hero-gradient);
    padding: clamp(120px, 15vw, 160px) 0 clamp(1.5rem, 4vw, 2.5rem);
    text-align: center;
    position: relative;
    overflow: hidden;
}
[data-theme="dark"] .qt-hero {
    background:
        radial-gradient(ellipse 50% 60% at 30% 20%, rgba(129, 140, 248, 0.12), transparent 70%),
        radial-gradient(ellipse 40% 50% at 80% 60%, rgba(167, 139, 250, 0.08), transparent 60%),
        radial-gradient(ellipse 60% 40% at 50% 100%, rgba(96, 165, 250, 0.06), transparent 50%),
        var(--hero-gradient);
}
.qt-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}
.qt-hero p {
    color: var(--text-secondary);
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    max-width: 520px;
    margin: 0 auto;
}
.qt-lang {
    display: inline-flex;
    gap: 0;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    overflow: hidden;
    background: var(--card-bg);
}
.qt-lang button {
    border: none;
    background: transparent;
    padding: 6px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-tertiary);
    cursor: pointer;
    font-family: var(--font-body);
    transition: background 0.15s, color 0.15s;
}
.qt-lang button.active {
    background: var(--accent);
    color: #fff;
}

/* --- Layout --- */
.qt-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: clamp(1.5rem, 3vw, 2.5rem);
    align-items: start;
    padding: clamp(1.5rem, 3vw, 2.5rem) 0 clamp(3rem, 6vw, 5rem);
}

/* --- Controls (left) --- */
.qt-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Type tabs */
.qt-types {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}
.qt-type-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s, background 0.15s;
    white-space: nowrap;
}
.qt-type-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}
.qt-type-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}
.qt-type-btn.active {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
}

/* Content inputs */
.qt-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}
.qt-input-group {
    display: none;
    flex-direction: column;
    gap: 0.75rem;
}
.qt-input-group.active {
    display: flex;
}
.qt-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.qt-field label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.qt-field input,
.qt-field textarea,
.qt-field select {
    padding: 10px 12px;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-body);
    outline: none;
    transition: border-color 0.15s;
}
.qt-field input:focus,
.qt-field textarea:focus,
.qt-field select:focus {
    border-color: var(--accent);
}
.qt-field textarea {
    resize: vertical;
    min-height: 80px;
}
.qt-field select {
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M1.4 0L6 4.6 10.6 0 12 1.4l-6 6-6-6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
[data-theme="dark"] .qt-field select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2394A3B8' d='M1.4 0L6 4.6 10.6 0 12 1.4l-6 6-6-6z'/%3E%3C/svg%3E");
}
.qt-field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

/* Design accordion */
.qt-design {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--card-bg);
}
.qt-design details {
    border-bottom: 1px solid var(--border-color);
}
.qt-design details:last-child {
    border-bottom: none;
}
.qt-design summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 1.25rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: background 0.15s;
}
.qt-design summary::-webkit-details-marker { display: none; }
.qt-design summary::before {
    content: '';
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-tertiary);
    border-bottom: 2px solid var(--text-tertiary);
    transform: rotate(-45deg);
    transition: transform 0.2s;
    flex-shrink: 0;
}
.qt-design details[open] > summary::before {
    transform: rotate(45deg);
}
.qt-design summary:hover {
    background: var(--bg-secondary);
}
.qt-design summary svg {
    width: 18px;
    height: 18px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 2;
    flex-shrink: 0;
}
.qt-design-body {
    padding: 0 1.25rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Color picker row */
.qt-color-row {
    display: flex;
    align-items: center;
    gap: 10px;
}
.qt-color-row label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    min-width: 70px;
}
.qt-color-row input[type="color"] {
    width: 36px;
    height: 36px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 2px;
    cursor: pointer;
    background: var(--card-bg);
}
.qt-color-row input[type="text"] {
    width: 80px;
    padding: 6px 8px;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.8rem;
    font-family: var(--font-body);
}

/* Pattern / corner selectors */
.qt-pattern-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.qt-pattern-btn {
    width: 44px;
    height: 44px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s;
    padding: 6px;
}
.qt-pattern-btn:hover {
    border-color: var(--accent);
}
.qt-pattern-btn.active {
    border-color: var(--accent);
    background: var(--accent-light);
}
.qt-pattern-btn svg {
    width: 100%;
    height: 100%;
}

/* Logo upload */
.qt-logo-upload {
    display: flex;
    align-items: center;
    gap: 12px;
}
.qt-logo-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}
.qt-logo-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}
.qt-logo-preview {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: contain;
    border: 1px solid var(--border-color);
}
.qt-logo-remove {
    border: none;
    background: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 4px 8px;
    font-family: var(--font-body);
}
.qt-logo-remove:hover {
    color: #ef4444;
}

/* --- Preview (right) --- */
.qt-preview {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.qt-preview-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}
.qt-qr-canvas {
    width: 100%;
    max-width: 280px;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
.qt-qr-canvas canvas,
.qt-qr-canvas svg {
    width: 100% !important;
    height: 100% !important;
}
.qt-watermark {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    letter-spacing: 0.05em;
}
.qt-watermark-top {
    opacity: 0.5;
}
.qt-custom-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    min-height: 1.2em;
    word-break: break-word;
    max-width: 280px;
}
.qt-custom-text:empty {
    display: none;
}
.qt-custom-text-input {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.qt-custom-text-input > label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.qt-custom-text-input > input[type="text"] {
    padding: 10px 12px;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-body);
}
.qt-text-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.qt-text-opt {
    flex: 1 1 100px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.qt-text-opt label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
}
.qt-text-opt select {
    padding: 6px 28px 6px 8px;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.82rem;
    font-family: var(--font-body);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%23666' d='M1.2 0L5 3.8 8.8 0 10 1.2l-5 5-5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    cursor: pointer;
}
.qt-text-opt input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}
/* Template picker */
.qt-tpl-picker {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.qt-tpl-picker > label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.qt-tpl-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}
.qt-tpl-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 8px 4px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    font-family: var(--font-body);
}
.qt-tpl-card:hover {
    border-color: var(--accent);
}
.qt-tpl-card.active {
    border-color: var(--accent);
    background: var(--accent-light);
}
.qt-tpl-card > span {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}
.qt-tpl-swatch {
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
}
.qt-tpl-swatch--plain {
    background: #f5f5f5;
    color: #333;
    box-shadow: inset 0 1px 4px rgba(0,0,0,0.06);
}
.qt-tpl-swatch--letter {
    background: linear-gradient(180deg, #fdf8ef, #f5efe0);
    color: #3d2b1f;
    font-family: 'Caveat', cursive;
    font-size: 1.5rem;
    background-image:
        linear-gradient(180deg, #fdf8ef, #f5efe0),
        repeating-linear-gradient(transparent, transparent 11px, rgba(170,150,115,0.2) 11px, rgba(170,150,115,0.2) 12px);
    background-blend-mode: normal;
}
.qt-tpl-swatch--chibi {
    background: linear-gradient(135deg, #fce4ec, #f3e5f5);
    font-size: 1.5rem;
}
.qt-tpl-swatch--floral {
    background: linear-gradient(135deg, #f0f4ec, #f8f5ec);
    font-size: 1.5rem;
}
[data-theme="dark"] .qt-tpl-swatch--plain {
    background: #2a2a2a;
    color: #ccc;
}

.qt-field-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.qt-field-head label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.qt-char-count {
    font-size: 0.72rem;
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
}
.qt-char-count.warn {
    color: #ef4444;
    font-weight: 600;
}
.qt-field small {
    font-weight: 400;
    color: var(--text-tertiary);
}

.qt-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.qt-download,
.qt-copy {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 16px;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: opacity 0.15s, transform 0.1s;
}
.qt-download {
    background: linear-gradient(135deg, #6366F1, #8B5CF6);
    color: #fff;
}
.qt-copy {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.qt-download:hover, .qt-copy:hover { opacity: 0.85; }
.qt-download:active, .qt-copy:active { transform: scale(0.98); }
.qt-download svg, .qt-copy svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}
.qt-copy.copied {
    background: #10b981;
    color: #fff;
    border-color: #10b981;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .qt-layout {
        grid-template-columns: 1fr 320px;
    }
}

@media (max-width: 768px) {
    .qt-layout {
        grid-template-columns: 1fr;
    }
    .qt-preview {
        position: static;
        order: -1;
    }
    .qt-preview-card {
        padding: 1.5rem;
    }
    .qt-qr-canvas {
        max-width: 220px;
    }
    .qt-types {
        grid-template-columns: repeat(3, 1fr);
    }
    .qt-field-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .qt-types {
        grid-template-columns: repeat(2, 1fr);
    }
    .qt-qr-canvas {
        max-width: 180px;
    }
    .qt-tpl-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Use-case grid */
.qt-usecase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(1rem, 2vw, 1.5rem);
}
.qt-usecase-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: clamp(1rem, 2vw, 1.5rem);
}
.qt-usecase-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}
.qt-usecase-card p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.65;
}
.qt-usecase-card a {
    color: var(--accent);
    text-decoration: none;
}
.qt-usecase-card a:hover { text-decoration: underline; }
@media (max-width: 1024px) {
    .qt-usecase-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .qt-usecase-grid { grid-template-columns: 1fr; }
}