:root {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #00df9a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #333333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 500px;
    background-color: var(--surface-color);
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 10px;
}

header p {
    font-size: 1rem;
    color: var(--text-secondary);
}

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

.input-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

/* --- ESTILOS CAMPO DE TELÉFONO --- */
.phone-container {
    display: flex;
    align-items: center;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.phone-container:focus-within {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 223, 154, 0.2);
}

#country-code {
    background-color: transparent;
    border: none;
    color: var(--text-primary);
    padding: 12px 10px 12px 15px;
    font-size: 1rem;
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

#country-code:focus {
    outline: none;
}

.phone-container input[type="tel"] {
    flex-grow: 1;
    background-color: transparent;
    border: none;
    padding: 12px 15px 12px 5px;
    color: var(--text-primary);
    font-size: 1rem;
    width: 100%;
}

.phone-container input[type="tel"]:focus {
    outline: none;
    box-shadow: none;
}

/* --- ESTILOS CAMPO DE MENSAJE Y EMOJI --- */
.message-input-wrapper {
    position: relative;
}

textarea {
    width: 100%;
    padding: 12px 45px 12px 15px;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
    resize: vertical;
    min-height: 80px;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 223, 154, 0.2);
}

.emoji-button {
    position: absolute;
    right: 8px;
    bottom: 8px;
    width: 30px;
    height: 30px;
    padding: 0;
    font-size: 1.2rem; 
    background-color: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: color 0.3s, background-color 0.3s;
}

.emoji-button:hover {
    color: var(--text-primary);
    background-color: var(--border-color);
    transform: none;
}

.emoji-picker {
    position: absolute;
    bottom: calc(100% + 10px);
    right: 0;
    width: 320px;
    height: 250px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    z-index: 10;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.emoji-picker.hidden {
    display: none;
}

.emoji-categories {
    flex-shrink: 0;
    display: flex;
    gap: 5px;
    padding: 8px 10px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--background-color);
    overflow-x: auto;
}

.emoji-category {
    padding: 6px 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    background-color: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    white-space: nowrap;
}

.emoji-category:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.emoji-category.active {
    background-color: var(--primary-color);
    color: #000;
    font-weight: 500;
}

.emoji-list {
    flex-grow: 1;
    padding: 10px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
    gap: 5px;
    overflow-y: auto;
}

.emoji-list span {
    cursor: pointer;
    font-size: 1.5rem;
    text-align: center;
    padding: 5px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.emoji-list span:hover {
    background-color: var(--background-color);
}

/* --- ESTILOS GENERALES --- */
#generateBtn {
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: #000;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

#generateBtn:hover {
    background-color: #00c988;
    transform: translateY(-2px);
}

.result-container {
    margin-top: 30px;
    text-align: center;
}

.result-container.hidden {
    display: none;
}

.result-container p {
    margin-bottom: 15px;
    font-weight: 500;
}

.link-box {
    display: flex;
    gap: 10px;
}

#generatedLink {
    flex-grow: 1;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: default;
    padding: 12px 15px;
    border-radius: 8px;
    font-size: 1rem;
}

.secondary-button {
    width: auto;
    padding: 0 20px;
    font-size: 0.9rem;
    background-color: var(--surface-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.secondary-button:hover {
    background-color: var(--background-color);
    border-color: var(--text-secondary);
    transform: none;
}

#copyBtn {
    width: auto;
    padding: 0 20px;
    font-size: 0.9rem;
    background-color: var(--surface-color);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

#copyBtn:hover {
    background-color: rgba(0, 223, 154, 0.1);
    transform: none;
}