:root {
    --bg-color: #f0f0f0;
    --container-bg: #ffffff;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #d1d1d1;
    --input-focus: #888888;
    --btn-bg: #4a4a4a;
    --btn-hover: #222222;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 40px 15px;
}

.container {
    max-width: 750px;
    margin: 0 auto;
    background: var(--container-bg);
    padding: 50px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

header {
    text-align: center;
    margin-bottom: 45px;
}

header h1 {
    font-size: 32px;
    margin-bottom: 12px;
    color: #111111;
    font-weight: 600;
}

header p {
    color: var(--text-light);
    font-size: 15px;
    max-width: 600px;
    margin: 0 auto;
}

.form-section {
    margin-bottom: 35px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h2 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #444;
    font-weight: 500;
}

.section-desc {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 18px;
    margin-top: -10px;
}

.form-group-flex {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.half {
    flex: 1 1 calc(50% - 15px);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
    color: #555;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #fafafa;
    font-size: 15px;
    color: var(--text-color);
    transition: outline 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--input-focus);
    background-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(136, 136, 136, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.file-group {
    background: #fdfdfd;
    padding: 16px;
    border: 1.5px dashed var(--border-color);
    border-radius: 8px;
    transition: border-color 0.3s ease;
}

.file-group:hover {
    border-color: #aaaaaa;
}

.file-instruction {
    display: inline-block;
    font-size: 13px;
    color: #666;
    margin-bottom: 10px;
    background: #f0f0f0;
    padding: 4px 8px;
    border-radius: 4px;
}

input[type="file"] {
    display: block;
    width: 100%;
    font-size: 14px;
    color: #444;
}

input[type="file"]::file-selector-button {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: #fff;
    cursor: pointer;
    font-weight: 500;
    margin-right: 15px;
    transition: background 0.3s ease;
}

input[type="file"]::file-selector-button:hover {
    background: #f0f0f0;
}

.submit-section {
    text-align: center;
    margin-top: 20px;
    background: #f8f8f8;
    padding: 30px;
    border-radius: 8px;
    border: 1px solid #eeeeee;
}

.submit-section p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.submit-section p strong {
    color: #c0392b; /* Subtle red for warning */
}

.btn-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--btn-bg);
    color: #ffffff;
    padding: 16px 36px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    margin-top: 20px;
    letter-spacing: 0.5px;
}

.btn-submit:hover {
    background-color: var(--btn-hover);
}

.btn-submit:active {
    transform: scale(0.98);
}

@media (max-width: 650px) {
    body {
        padding: 20px 10px;
    }
    .container {
        padding: 30px 20px;
    }
    .half {
        flex: 1 1 100%;
    }
    header h1 {
        font-size: 26px;
    }
}

/* Pantalla de agradecimiento premium */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.5);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.thank-you-card {
    text-align: center;
    padding: 40px 10px;
    animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.thank-you-icon {
    font-size: 64px;
    margin-bottom: 24px;
    display: inline-block;
    animation: scaleIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Contenedor de vistas previas dinámicas */
.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

/* Tarjeta de vista previa */
.preview-card {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 8px;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.preview-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

/* Contenedor de miniatura */
.preview-thumb-container {
    position: relative;
    width: 100%;
    height: 100px;
    border-radius: 6px;
    overflow: hidden;
    background-color: #f1f5f9;
    margin-bottom: 6px;
}

.preview-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Botón para eliminar foto */
.preview-remove {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    line-height: 1;
    transition: background 0.2s ease, transform 0.1s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.preview-remove:hover {
    background: rgb(220, 38, 38);
    transform: scale(1.1);
}

/* Entrada de texto para identificar foto */
.preview-input {
    width: 100%;
    padding: 6px 8px;
    font-size: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    margin-top: 4px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-sizing: border-box;
}

.preview-input:focus {
    border-color: #94a3b8;
    box-shadow: 0 0 0 2px rgba(148, 163, 184, 0.15);
}

/* Etiqueta identificadora simple */
.preview-badge {
    display: inline-block;
    align-self: center;
    padding: 3px 8px;
    font-size: 11px;
    font-weight: 600;
    color: #475569;
    background-color: #f1f5f9;
    border-radius: 4px;
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}