:root {
     --bg: #f5f5f7;
     --card: #ffffff;
     --text: #1d1d1f;
     --border: #e5e5ea;
     --input: #ffffff;
 }

 .dark {
     --bg: #000;
     --card: #111;
     --text: #f5f5f7;
     --border: #2c2c2e;
     --input: #1c1c1e;
 }

 body {
     margin: 0;
     font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial;
     background: var(--bg);
     color: var(--text);
 }

 header {
     text-align: center;
     padding: 18px 20px;
     border-bottom: 1px solid var(--border);
     background: rgba(255, 255, 255, 0.7);
     backdrop-filter: blur(20px);
     position: sticky;
     top: 0;
     z-index: 10;
 }

 .dark header {
     background: rgba(0, 0, 0, 0.7);
 }

 html {
     scroll-behavior: smooth;
 }

 h1 {
     font-size: 24px;
     margin: 0 0 4px 0;
     font-weight: 600;
 }

 header p {
     font-size: 13px;
     margin: 0;
     opacity: .7;
 }

 .topnav {
     margin-top: 6px;
     display: flex;
     gap: 16px;
     justify-content: center;
     font-size: 13px;
 }

 .topnav a {
     text-decoration: none;
     color: var(--text);
     opacity: .7;
 }

 .container {
     max-width: 1100px;
     margin: auto;
     padding: 40px 20px;
 }

 .generator {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 32px;
 }

 .panel {
     background: var(--card);
     padding: 28px;
     border-radius: 16px;
     border: 1px solid var(--border);
     box-shadow: 0 10px 30px rgba(0, 0, 0, .05);
 }

 .preview {
     display: flex;
     flex-direction: column;
     align-items: center;
     justify-content: center;
     gap: 24px;
     text-align: center;
 }

 #qr {
     min-height: 300px;
     position: relative;
     display: flex;
     justify-content: center;
     align-items: center;
 }

 #qr canvas,
 #qr svg {
     max-width: 320px;
     width: 100%;
     height: auto;
 }

 .form-grid {
     display: grid;
     grid-template-columns: 1fr;
     gap: 14px;
     width: 100%;
 }

 label {
     font-size: 13px;
     opacity: .7;
 }

 input,
 select {
     width: 100%;
     height: 32px;
     padding: 0 12px;
     border-radius: 10px;
     border: 1px solid var(--border);
     background: var(--input);
     color: var(--text);
     font-size: 14px;
     box-sizing: border-box;
 }

 input[type="range"] {
     width: 100%;
     height: 6px;
     background: var(--border);
     border-radius: 10px;
     padding: 0;
 }

 input[type="checkbox"] {
     width: 16px;
     height: 16px;
     margin-right: 6px;
     cursor: pointer;
 }

 label:has(input[type="checkbox"]) {
     display: flex;
     align-items: center;
     gap: 6px;
     font-size: 13px;
 }

 input[type="range"]::-webkit-slider-thumb {
     appearance: none;
     width: 16px;
     height: 16px;
     background: black;
     border-radius: 50%;
     cursor: pointer;
 }

 input[type="file"] {
     height: auto;
     padding: 8px;
 }

 button {
     background: transparent;
     border: 1px solid black;
     color: black;
     padding: 10px 16px;
     border-radius: 12px;
     cursor: pointer;
     font-size: 14px;
     transition: .2s;
 }

 button:hover {
     background: black;
     color: white;
 }

 .downloads {
     display: flex;
     gap: 10px;
     flex-wrap: wrap;
     justify-content: center;
 }

 .modeToggle {
     position: absolute;
     right: 20px;
     top: 20px;
     cursor: pointer;
     font-size: 18px;
     background: var(--card);
     border: 1px solid var(--border);
     width: 38px;
     height: 38px;
     display: flex;
     align-items: center;
     justify-content: center;
     border-radius: 10px;
 }

 .info {
     max-width: 900px;
     margin: 120px auto 0 auto;
     padding: 0 20px;
     line-height: 1.8;
 }

 .info h2 {
     font-size: 26px;
     margin-top: 60px;
     margin-bottom: 12px;
     font-weight: 600;
     letter-spacing: -0.2px;
 }

 .info h3 {
     font-size: 20px;
     margin-top: 30px;
     margin-bottom: 6px;
     font-weight: 600;
 }

 .info p {
     font-size: 16px;
     opacity: .85;
     margin-top: 8px;
 }

 .info p+p {
     margin-top: 14px;
 }

 .info {
     border-top: 1px solid var(--border);
     padding-top: 80px;
 }

 footer {
     margin-top: 120px;
     background: var(--card);
     border-top: 1px solid var(--border);
     padding: 70px 20px 40px 20px;
 }

 footer h2 {
     font-size: 24px;
     text-align: center;
     margin-bottom: 10px;
 }

 footer>p {
     max-width: 700px;
     margin: 0 auto 60px auto;
     text-align: center;
     opacity: .8;
     font-size: 15px;
     line-height: 1.7;
 }

 .footer-container {
     max-width: 1100px;
     margin: auto;
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
     gap: 40px;
 }

 .footer-container h4 {
     font-size: 15px;
     margin-bottom: 10px;
     font-weight: 600;
 }

 .footer-container p {
     font-size: 14px;
     opacity: .75;
     line-height: 1.6;
 }

 .footer-container a {
     color: var(--text);
     text-decoration: none;
     opacity: .8;
 }

 .footer-container a:hover {
     opacity: 1;
     text-decoration: underline;
 }

 .footer-bottom {
     text-align: center;
     margin-top: 60px;
     font-size: 13px;
     opacity: .6;
 }

 .footer-container a {
     transition: opacity .2s ease;
 }

 .hidden {
     display: none;
 }

 .error {
     color: red;
     font-size: 13px;
     margin-top: 6px;
 }


 #qr {
     min-height: 300px;
     position: relative;
 }

 #qr-placeholder {
     position: absolute;
     inset: 0;
     display: flex;
     align-items: center;
     justify-content: center;
     text-align: center;
     font-size: 14px;
     opacity: .6;
     padding: 20px;
 }

 button:disabled {
     opacity: .4;
     cursor: not-allowed;
     background: transparent;
     border: 1px solid #999;
     color: #999;
 }

 #toast {
     position: fixed;
     top: 10px;
     left: 50%;
     transform: translateX(-50%) translateY(-20px);

     display: flex;
     align-items: center;
     gap: 10px;

     background: rgba(20, 20, 20, 0.92);
     color: white;

     padding: 12px 22px;

     border-radius: 12px;

     font-size: 14px;
     font-weight: 500;

     box-shadow:
         0 10px 25px rgba(0, 0, 0, 0.25),
         0 2px 6px rgba(0, 0, 0, 0.15);

     backdrop-filter: blur(12px);

     border: 1px solid rgba(255, 255, 255, 0.08);

     opacity: 0;
     pointer-events: none;

     transition: all .35s ease;

     z-index: 9999;
 }

 #toast.show {
     opacity: 1;
     transform: translateX(-50%) translateY(0);
 }

 @media(max-width:768px) {

     .info {
         margin-top: 80px;
     }

     .info h2 {
         font-size: 22px;
     }

     footer {
         padding: 60px 20px;
     }

     .footer-container {
         grid-template-columns: 1fr;
         gap: 30px;
         text-align: center;
     }

 }
.quick-links {
    max-width: 1100px;
    margin: 10px auto 0;
    padding: 0 20px 20px;
}

.quick-links h2 {
    text-align: center;
    font-size: 24px;
    margin: 10px 0 20px;
}

.generator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.generator-card {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 14px;
    background: var(--card);
    text-decoration: none;
    color: var(--text);
    transition: transform .2s ease, box-shadow .2s ease;
}

.generator-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .08);
}

.generator-card strong {
    display: block;
    margin-bottom: 4px;
}

.generator-card span {
    font-size: 13px;
    opacity: .75;
}

.back-home {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
    text-decoration: none;
    border: 1px solid var(--border);
    padding: 8px 12px;
    border-radius: 10px;
    color: var(--text);
    font-size: 13px;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 8px;
}

.preset-grid button {
    border-color: var(--border);
    color: var(--text);
}