/* Tipografía y layout básico */
:root {
  --bg: #0f172a;
  --panel: #111827;
  --muted: #94a3b8;
  --text: #e5e7eb;
  --primary: #2563eb;
  --primary-600: #1d4ed8;
  --secondary: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --info: #06b6d4;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Poppins', system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% 10%, #111827 0%, #0b1223 45%, var(--bg) 100%);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

.header {
  text-align: center;
  padding: 24px 0 8px;
}

.header h1 { 
  margin: 0 0 8px; 
  font-weight: 700; 
  letter-spacing: .3px; 
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.header-logo {
  width: 300px;
  height: 120px;
  filter: none;
  opacity: 1;
}

.header p { margin: 0; color: white; }

.main-content {
  margin-top: 20px;
  display: grid;
  gap: 20px;
}

.qr-generator, .qr-result, .carta-preview {
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.07);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.qr-generator h2, .qr-result h2, .carta-preview h2 {
  margin: 0 0 16px;
  font-size: 20px;
}

.generator-tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }

.tab-btn {
  border: 1px solid rgba(255,255,255,.1);
  background: rgba(255,255,255,.04);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: all .2s ease;
}

.tab-btn:hover { transform: translateY(-1px); background: rgba(255,255,255,.06); }
.tab-btn.active { background: var(--primary); border-color: var(--primary-600); }

.tab-content { display: none; }
.tab-content.active { display: block; }

.url-form, .carta-form { display: grid; gap: 14px; }
.form-group { display: grid; gap: 8px; }
.form-group label { font-weight: 600; }
.form-help { color: var(--muted); font-size: 12px; }

input[type="text"], input[type="url"], input[type="tel"], select, textarea, input[type="file"], input[type="range"] {
  width: 100%;
  background: #ffffff;
  color: #0f172a;
  border: 1px solid rgba(15, 23, 42, .2);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}

input[type="range"] { padding: 6px 8px; }
input[type="file"] { padding: 10px; background: #fff; color: #0f172a; }

textarea { resize: vertical; }

input:focus, select:focus, textarea:focus, input[type="file"]:focus, input[type="range"]:focus {
  border-color: rgba(37,99,235, .6);
  box-shadow: 0 0 0 3px rgba(37,99,235, .15);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid transparent;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  color: white;
  transition: transform .1s ease, filter .15s ease, background .2s ease;
}

.btn:hover { filter: brightness(1.05); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--primary); border-color: var(--primary-600); }
.btn-secondary { background: var(--secondary); }
.btn-success { background: var(--success); }
.btn-warning { background: var(--warning); color: #0f172a; }
.btn-info { background: var(--info); }

.qr-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}

#qrcode {
  display: inline-block;
  background: white;
  padding: 10px;
  border-radius: 12px;
}

.qr-info h3 { margin: 0 0 6px; }
.qr-info p { margin: 0 0 10px; color: var(--muted); }

.qr-url { margin: 8px 0 12px; }
.url-link { color: #60a5fa; text-decoration: none; word-break: break-all; }
.url-link:hover { text-decoration: underline; }

.qr-details { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
  display: inline-block;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--text);
}

.qr-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }

.carta-header h1 { margin: 0 0 8px; }
.carta-header p { margin: 0 0 12px; color: var(--muted); }
.carta-badges { display: flex; gap: 8px; flex-wrap: wrap; }

.carta-info { margin-top: 14px; display: grid; gap: 8px; }
.info-item { display: inline-flex; align-items: center; gap: 8px; color: var(--text); }
.info-item i { color: var(--muted); }

@media (max-width: 820px) {
  .qr-container { grid-template-columns: 1fr; }
}

footer.footer { text-align: center; color: var(--muted); margin: 16px 0; }

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main content */
.main-content {
    display: grid;
    gap: 30px;
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* Generador de QR */
.qr-generator {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

.qr-generator h2 {
    color: #667eea;
    margin-bottom: 25px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Pestañas */
.generator-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 20px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: #666;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    background: #f8f9fa;
    color: #667eea;
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Formularios */
.url-form,
.carta-form {
    margin-top: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 14px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.form-help {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: #666;
    font-style: italic;
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
    justify-content: center;
    padding: 16px;
    font-size: 16px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
    transform: translateY(-2px);
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
    transform: translateY(-2px);
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-warning:hover {
    background: #e0a800;
    transform: translateY(-2px);
}

/* Resultado QR */
.qr-result {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    text-align: center;
}

.qr-result h2 {
    color: #667eea;
    margin-bottom: 25px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

#qrcode {
    padding: 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.qr-info h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.qr-info p {
    color: #666;
    margin-bottom: 15px;
}

.qr-url {
    margin-bottom: 15px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.url-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    word-break: break-all;
}

.url-link:hover {
    text-decoration: underline;
}

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

.qr-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

@media (min-width: 768px) {
    .qr-actions {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
}

/* Badges */
.badge {
    display: inline-block;
    padding: 6px 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Vista previa de carta */
.carta-preview {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    grid-column: 1 / -1;
}

.carta-preview h2 {
    color: #667eea;
    margin-bottom: 25px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
    text-align: center;
    justify-content: center;
}

.carta-content {
    max-width: 600px;
    margin: 0 auto;
}

.carta-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

.carta-header h1 {
    color: #333;
    font-size: 2rem;
    margin-bottom: 10px;
}

.carta-header p {
    color: #666;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

.carta-info {
    display: grid;
    gap: 15px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.info-item i {
    color: #667eea;
    font-size: 1.2rem;
    width: 20px;
    text-align: center;
}

.info-item a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.info-item a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 40px;
    color: white;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .qr-generator,
    .qr-result,
    .carta-preview {
        padding: 20px;
    }
    
    .generator-tabs {
        flex-direction: column;
        gap: 5px;
    }
    
    .tab-btn {
        width: 100%;
        justify-content: center;
    }
    
    .qr-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Animaciones */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.qr-result,
.carta-preview {
    animation: fadeInUp 0.6s ease-out;
}

/* Estilos para el código QR */
#qrcode img {
    border-radius: 10px;
    max-width: 100%;
    height: auto;
}

/* Hover effects */
.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: #b8c2cc;
}

/* Focus states mejorados */
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    transform: translateY(-1px);
}

/* Validación de campos */
.form-group input:invalid,
.form-group select:invalid,
.form-group textarea:invalid {
    border-color: #dc3545;
}

.form-group input:valid,
.form-group select:valid,
.form-group textarea:valid {
    border-color: #28a745;
}