diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9b12656..7c43a1d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [1.1.0] - 16-12-2025
+### Added
+- Soporte para Modo Oscuro (Dark Mode) con detección automática y toggle manual.
+- Mejoras de UI/UX: Nueva tipografía 'Outfit', sombras suavizadas, transiciones y bordes redondeados.
+- Estilización mejorada del logo.
+
 ## [1.0.0] - 16-12-2025
 ### Added
 - Interfaz gráfica moderna y responsiva para la búsqueda de clientes y generación de pagos.
diff --git a/README.md b/README.md
index 7d180d2..9fa52ea 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # SIIP - Generador de Payment Intents Stripe
 
-![Version](https://img.shields.io/badge/version-1.0.0-blue.svg)
+![Version](https://img.shields.io/badge/version-1.1.0-blue.svg)
 ![UCRM Compliancy](https://img.shields.io/badge/UCRM-v1.0.0%2B-success.svg)
 ![PHP](https://img.shields.io/badge/PHP-7.4%2B-777bb4.svg)
 ![License](https://img.shields.io/badge/license-MIT-green.svg)
@@ -38,5 +38,5 @@ Este plugin permite buscar clientes en la base de datos de UISP CRM y generar in
 - Si el cliente no tiene un "Stripe Customer ID", no se permitirá generar el pago.
 
 ---
-**Versión**: 1.0.0
+**Versión**: 1.1.0
 **Copyright**: © 2024 SIIP Internet. Todos los derechos reservados.
diff --git a/manifest.json b/manifest.json
index 13dca38..9ce2143 100644
--- a/manifest.json
+++ b/manifest.json
@@ -5,7 +5,7 @@
     "displayName": "SIIP - Generador de Payment Intents Stripe",
     "description": "Generador manual de Payment Intents Stripe para los clientes de UISP CRM, útil para conciliación de pagos no registrados en UISP CRM",
     "url": "https://siip.mx",
-    "version": "1.0.0",
+    "version": "1.1.0",
     "ucrmVersionCompliancy": {
       "min": "1.0.0",
       "max": null
diff --git a/public.php b/public.php
index 5835487..301ec7b 100644
--- a/public.php
+++ b/public.php
@@ -107,84 +107,142 @@ if ($action === 'create_intent') {
     <!-- Fonts -->
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
+    <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&display=swap" rel="stylesheet">
     
     <style>
         :root {
-            --primary: #006aff;
-            --primary-dark: #0056cc;
-            --bg-body: #f4f6f8;
+            /* Light Mode Variables */
+            --primary: #4f46e5; /* Indigo 600 */
+            --primary-hover: #4338ca; /* Indigo 700 */
+            --bg-body: #f3f4f6;
             --bg-card: #ffffff;
-            --text-main: #1f2937;
+            --text-main: #111827;
             --text-muted: #6b7280;
             --border: #e5e7eb;
-            --success: #10b981;
-            --danger: #ef4444;
-            --radius: 12px;
-            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
+            --input-bg: #ffffff;
+            --success-bg: #ecfdf5;
+            --success-text: #065f46;
+            --error-bg: #fef2f2;
+            --error-text: #991b1b;
+            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
+            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
+            --radius: 16px;
+            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        [data-theme="dark"] {
+            /* Dark Mode Variables */
+            --primary: #6366f1; /* Indigo 500 */
+            --primary-hover: #818cf8; /* Indigo 400 */
+            --bg-body: #111827; /* Gray 900 */
+            --bg-card: #1f2937; /* Gray 800 */
+            --text-main: #f9fafb; /* Gray 50 */
+            --text-muted: #9ca3af; /* Gray 400 */
+            --border: #374151; /* Gray 700 */
+            --input-bg: #111827; /* Gray 900 */
+            --success-bg: #064e3b;
+            --success-text: #6ee7b7;
+            --error-bg: #7f1d1d;
+            --error-text: #fca5a5;
+            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
+            --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
         }
 
         * { box-sizing: border-box; outline: none; }
         
         body {
-            font-family: 'Inter', sans-serif;
+            font-family: 'Outfit', sans-serif;
             background-color: var(--bg-body);
             color: var(--text-main);
             margin: 0;
             padding: 20px;
             display: flex;
             justify-content: center;
+            align-items: center;
             min-height: 100vh;
+            transition: background-color var(--transition), color var(--transition);
         }
 
         .container {
             width: 100%;
-            max-width: 600px;
+            max-width: 550px;
             background: var(--bg-card);
             border-radius: var(--radius);
-            box-shadow: var(--shadow);
-            padding: 2rem;
+            box-shadow: var(--shadow-md);
+            padding: 2.5rem;
             display: flex;
             flex-direction: column;
             gap: 1.5rem;
+            position: relative;
+            transition: background-color var(--transition), box-shadow var(--transition);
+        }
+
+        /* Dark Mode Toggle */
+        .theme-toggle {
+            position: absolute;
+            top: 1.5rem;
+            right: 1.5rem;
+            background: transparent;
+            border: none;
+            color: var(--text-muted);
+            cursor: pointer;
+            padding: 0.5rem;
+            border-radius: 50%;
+            transition: all 0.2s;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+        }
+
+        .theme-toggle:hover {
+            color: var(--primary);
+            background-color: rgba(99, 102, 241, 0.1);
         }
 
         .header {
             text-align: center;
-            margin-bottom: 1rem;
+            margin-bottom: 0.5rem;
         }
         
         .header img {
-            max-height: 60px;
-            margin-bottom: 1rem;
+            max-height: 70px;
+            margin-bottom: 1.25rem;
             display: block;
             margin-left: auto;
             margin-right: auto;
+            filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
+            border-radius: 16px;
         }
 
         .header h1 {
-            font-size: 1.5rem;
+            font-size: 1.75rem;
             font-weight: 700;
             margin: 0;
-            color: var(--text-main);
+            background: linear-gradient(135deg, var(--text-main) 0%, var(--text-muted) 100%);
+            -webkit-background-clip: text;
+            -webkit-text-fill-color: transparent;
+            background-clip: text;
         }
         
         .header p {
             color: var(--text-muted);
-            margin: 0.5rem 0 0;
+            margin: 0.75rem 0 0;
+            font-size: 0.95rem;
+            line-height: 1.5;
         }
 
         .form-group {
             position: relative;
             display: flex;
             flex-direction: column;
-            gap: 0.5rem;
+            gap: 0.6rem;
         }
 
         label {
-            font-weight: 500;
+            font-weight: 600;
             font-size: 0.9rem;
             color: var(--text-main);
+            letter-spacing: 0.02em;
         }
 
         .input-wrapper {
@@ -193,26 +251,34 @@ if ($action === 'create_intent') {
 
         input[type="text"], input[type="number"] {
             width: 100%;
-            padding: 0.75rem 1rem;
+            padding: 0.875rem 1rem;
             border: 1px solid var(--border);
-            border-radius: 8px;
+            border-radius: 12px;
             font-size: 1rem;
             font-family: inherit;
-            transition: border-color 0.2s, box-shadow 0.2s;
+            background-color: var(--input-bg);
+            color: var(--text-main);
+            transition: all 0.2s;
         }
 
         input:focus {
             border-color: var(--primary);
-            box-shadow: 0 0 0 3px rgba(0, 106, 255, 0.1);
+            box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
+        }
+
+        input::placeholder {
+            color: var(--text-muted);
+            opacity: 0.7;
         }
 
         .search-icon {
             position: absolute;
-            right: 12px;
+            right: 14px;
             top: 50%;
             transform: translateY(-50%);
             color: var(--text-muted);
             pointer-events: none;
+            font-size: 1.1rem;
         }
 
         /* Predictions Dropdown */
@@ -221,22 +287,23 @@ if ($action === 'create_intent') {
             top: 100%;
             left: 0;
             right: 0;
-            background: white;
+            background: var(--bg-card);
             border: 1px solid var(--border);
-            border-radius: 8px;
-            margin-top: 4px;
-            max-height: 250px;
+            border-radius: 12px;
+            margin-top: 6px;
+            max-height: 260px;
             overflow-y: auto;
-            z-index: 10;
+            z-index: 20;
             display: none;
-            box-shadow: var(--shadow);
+            box-shadow: var(--shadow-md);
+            overflow: hidden;
         }
 
         .prediction-item {
-            padding: 0.75rem 1rem;
+            padding: 1rem;
             cursor: pointer;
             border-bottom: 1px solid var(--border);
-            transition: background 0.1s;
+            transition: background 0.15s;
         }
 
         .prediction-item:last-child {
@@ -244,19 +311,20 @@ if ($action === 'create_intent') {
         }
 
         .prediction-item:hover {
-            background-color: #f9fafb;
+            background-color: rgba(99, 102, 241, 0.05);
         }
 
         .prediction-item .name {
             font-weight: 600;
             display: block;
+            color: var(--text-main);
         }
 
         .prediction-item .address {
-            font-size: 0.8rem;
+            font-size: 0.85rem;
             color: var(--text-muted);
             display: block;
-            margin-top: 2px;
+            margin-top: 4px;
         }
 
         /* Client Details Section */
@@ -264,30 +332,38 @@ if ($action === 'create_intent') {
             border-top: 1px solid var(--border);
             padding-top: 1.5rem;
             display: none;
-            animation: fadeIn 0.3s ease-out;
+            animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
         }
 
-        @keyframes fadeIn {
-            from { opacity: 0; transform: translateY(10px); }
+        @keyframes slideUp {
+            from { opacity: 0; transform: translateY(20px); }
             to { opacity: 1; transform: translateY(0); }
         }
 
         .info-grid {
             display: grid;
             grid-template-columns: 1fr 1fr;
-            gap: 1rem;
-            margin-bottom: 1.5rem;
-            font-size: 0.9rem;
+            gap: 1.25rem 1rem;
+            margin-bottom: 2rem;
+            font-size: 0.95rem;
+            background: rgba(99, 102, 241, 0.03); 
+            padding: 1.5rem;
+            border-radius: 12px;
+            border: 1px solid var(--border);
         }
         
         .info-item .label {
             color: var(--text-muted);
             font-size: 0.8rem;
-            margin-bottom: 2px;
+            text-transform: uppercase;
+            letter-spacing: 0.05em;
+            margin-bottom: 4px;
+            font-weight: 600;
         }
         
         .info-item .value {
-            font-weight: 500;
+            font-weight: 600;
+            color: var(--text-main);
         }
 
         .btn {
@@ -295,43 +371,50 @@ if ($action === 'create_intent') {
             align-items: center;
             justify-content: center;
             width: 100%;
-            padding: 0.875rem;
+            padding: 1rem;
             background-color: var(--primary);
-            color: white;
+            color: #ffffff;
             font-weight: 600;
             border: none;
-            border-radius: 8px;
+            border-radius: 12px;
             cursor: pointer;
-            transition: background 0.2s, transform 0.1s;
+            transition: all 0.2s;
             font-size: 1rem;
+            letter-spacing: 0.01em;
+            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
         }
 
         .btn:hover {
-            background-color: var(--primary-dark);
+            background-color: var(--primary-hover);
+            transform: translateY(-1px);
+            box-shadow: 0 4px 6px rgba(0,0,0,0.15);
         }
         
         .btn:active {
-            transform: scale(0.99);
+            transform: translateY(0);
         }
 
         .btn:disabled {
             background-color: var(--border);
             color: var(--text-muted);
             cursor: not-allowed;
+            box-shadow: none;
+            transform: none;
         }
 
         /* Modal */
         .modal-overlay {
             position: fixed;
             top: 0; left: 0; right: 0; bottom: 0;
-            background: rgba(0,0,0,0.5);
+            background: rgba(0,0,0,0.6);
+            backdrop-filter: blur(4px);
             display: flex;
             align-items: center;
             justify-content: center;
             z-index: 50;
             opacity: 0;
             pointer-events: none;
-            transition: opacity 0.2s;
+            transition: opacity 0.3s;
         }
 
         .modal-overlay.active {
@@ -340,15 +423,15 @@ if ($action === 'create_intent') {
         }
 
         .modal {
-            background: white;
+            background: var(--bg-card);
             width: 90%;
-            max-width: 400px;
-            padding: 2rem;
-            border-radius: var(--radius);
-            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
+            max-width: 420px;
+            padding: 2.5rem;
+            border-radius: 20px;
+            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25);
             text-align: center;
-            transform: scale(0.95);
-            transition: transform 0.2s;
+            transform: scale(0.9);
+            transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
         }
         
         .modal-overlay.active .modal {
@@ -357,43 +440,63 @@ if ($action === 'create_intent') {
 
         .modal h3 {
             margin-top: 0;
+            color: var(--text-main);
+            font-size: 1.5rem;
+        }
+        
+        .modal p {
+            color: var(--text-muted);
+            margin-bottom: 2rem;
+            line-height: 1.6;
+        }
+        
+        .modal strong {
+            color: var(--primary);
         }
 
         .modal-actions {
             display: flex;
             gap: 1rem;
-            margin-top: 1.5rem;
         }
 
         .btn-secondary {
-            background: white;
+            background: transparent;
             border: 1px solid var(--border);
             color: var(--text-main);
         }
         
         .btn-secondary:hover {
-            background: #f9fafb;
+            background: rgba(0,0,0,0.05);
+            border-color: var(--text-muted);
+        }
+        
+        [data-theme="dark"] .btn-secondary:hover {
+            background: rgba(255,255,255,0.05);
         }
 
         /* Alerts */
         .alert {
             padding: 1rem;
-            border-radius: 8px;
-            margin-bottom: 1rem;
-            font-size: 0.9rem;
+            border-radius: 12px;
+            margin-bottom: 1.5rem;
+            font-size: 0.95rem;
             display: none;
+            border: 1px solid transparent;
+            display: flex;
+            align-items: flex-start;
+            gap: 0.75rem;
         }
         
         .alert.success {
-            background-color: #ecfdf5;
-            color: #065f46;
-            border: 1px solid #d1fae5;
+            background-color: var(--success-bg);
+            color: var(--success-text);
+            border-color: rgba(6, 95, 70, 0.1);
         }
         
         .alert.error {
-            background-color: #fef2f2;
-            color: #991b1b;
-            border: 1px solid #fee2e2;
+            background-color: var(--error-bg);
+            color: var(--error-text);
+            border-color: rgba(153, 27, 27, 0.1);
         }
         
         .spinner {
@@ -404,7 +507,7 @@ if ($action === 'create_intent') {
             border-radius: 50%;
             border-top-color: white;
             animation: spin 1s ease-in-out infinite;
-            margin-right: 8px;
+            margin-right: 10px;
         }
 
         @keyframes spin {
@@ -416,6 +519,13 @@ if ($action === 'create_intent') {
 <body>
 
 <div class="container">
+    <button class="theme-toggle" id="themeToggle" title="Cambiar tema">
+        <!-- Sun Icon -->
+        <svg id="sunIcon" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="display:none"><circle cx="12" cy="12" r="5"></circle><line x1="12" y1="1" x2="12" y2="3"></line><line x1="12" y1="21" x2="12" y2="23"></line><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line><line x1="1" y1="12" x2="3" y2="12"></line><line x1="21" y1="12" x2="23" y2="12"></line><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line></svg>
+        <!-- Moon Icon -->
+        <svg id="moonIcon" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path></svg>
+    </button>
+
     <div class="header">
         <img src="?action=image&file=logo.png" alt="Logo">
         <h1>Generar Intención de Pago</h1>
@@ -423,14 +533,16 @@ if ($action === 'create_intent') {
     </div>
 
     <!-- Alert Box -->
-    <div id="alertBox" class="alert"></div>
+    <div id="alertBox" class="alert" style="display: none;"></div>
 
     <!-- Search Section -->
     <div class="form-group">
         <label for="clientSearch">Buscar Cliente</label>
         <div class="input-wrapper">
             <input type="text" id="clientSearch" placeholder="Nombre, ID, Dirección..." autocomplete="off">
-            <span class="search-icon">🔍</span>
+            <span class="search-icon">
+                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line></svg>
+            </span>
             <div id="predictions" class="predictions"></div>
         </div>
     </div>
@@ -493,6 +605,38 @@ if ($action === 'create_intent') {
     const alertBox = document.getElementById('alertBox');
     const confirmModal = document.getElementById('confirmModal');
     
+    // Theme Toggle Logic
+    const themeToggle = document.getElementById('themeToggle');
+    const sunIcon = document.getElementById('sunIcon');
+    const moonIcon = document.getElementById('moonIcon');
+    const htmlEl = document.documentElement;
+
+    // Check saved theme or pref
+    const savedTheme = localStorage.getItem('theme');
+    if (savedTheme === 'dark' || (!savedTheme && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+        htmlEl.setAttribute('data-theme', 'dark');
+        sunIcon.style.display = 'block';
+        moonIcon.style.display = 'none';
+    } else {
+        htmlEl.removeAttribute('data-theme');
+        sunIcon.style.display = 'none';
+        moonIcon.style.display = 'block';
+    }
+
+    themeToggle.addEventListener('click', () => {
+        if (htmlEl.hasAttribute('data-theme')) {
+            htmlEl.removeAttribute('data-theme');
+            localStorage.setItem('theme', 'light');
+            sunIcon.style.display = 'none';
+            moonIcon.style.display = 'block';
+        } else {
+            htmlEl.setAttribute('data-theme', 'dark');
+            localStorage.setItem('theme', 'dark');
+            sunIcon.style.display = 'block';
+            moonIcon.style.display = 'none';
+        }
+    });
+
     let debounceTimer;
     let selectedClient = null;
 
@@ -537,7 +681,7 @@ if ($action === 'create_intent') {
 
     const selectClient = (id) => {
         predictionsDiv.style.display = 'none';
-        searchInput.value = ''; // Or keep name? "Se limpia el formulario" usually refers to after success, but search box usually clears or shows selected. User said: "se seleccione el cliente deseado... se deben cargar sus datos... y ahí estará el formulario".
+        searchInput.value = '';
 
         fetch(`?action=details&id=${id}`)
             .then(res => res.json())
@@ -637,7 +781,7 @@ if ($action === 'create_intent') {
     function showAlert(type, msg) {
         alertBox.className = `alert ${type}`;
         alertBox.textContent = msg;
-        alertBox.style.display = 'block';
+        alertBox.style.display = 'flex';
     }
 
     // Close predictions on click outside